Patent is not only the embodiment of the achievements of enterprise technological innovation, but also an important symbol of enterprise R & D strength and market competitiveness. Through high-quality patents or patent combinations, enterprises can demonstrate their innovation ability and market advantages in specific technical fields.

According to public data, in recent years, Ningde era, Sunshine power supply, Jingke Energy, Haibo Sichuang, BYD, Yiwei Lithium Energy, Dalian Rongke, Shanghai Electric, Beijing puneng, Zhongke Haitao, Weilan new energy, Nandu power supply, southern Power Grid, vision, Xinyuan intelligent storage, Ronghe yuan storage, Nanrui Jibao, Kehua digital energy, Huawei, Guodian Nanrui, Hewang electric, Neng electric, Sifang Jibao, Suoying electric, shuangdeng, Tianhe energy storage, guodian Nanrui, Jinfeng zero carbon, Xu Ji, etc. have applied for or obtained a number of patents one after another, involving battery, research and development and innovation of smart grid and power electronics technology.

Lithium battery leader leads technological innovation

the R & D team in Ningde era is large in scale. By the end of 2023, the number of R & D personnel had reached 20604, and the R & D investment in 2023 reached 18.4 billion yuan. The total number of domestic and foreign patents owned and being applied for was 29487.

On November 5th of this month, the State Intellectual Property Office announced three solid-state battery patents in Ningde era, namely "modified solid electrolyte and its preparation method, solid-state battery and electrical device", "Solid Electrolyte Membrane and preparation method thereof, solid-state battery, electric device" and "solid-state battery monomer and manufacturing method thereof".

solid-state batteries have been recognized as the next generation battery technology worldwide due to their multi-dimensional advantages such as potential high energy density, safety and low cost. Zeng Yuqun in Ningde era once said publicly that Ningde era "is a big step ahead in the study of solid-state batteries, or called Second to none in English.

Light storage faucet construction safety "protective wall"

the research and development cost of Sunshine power supply reached 2.447 billion yuan in 2023, up 45% year on year, and 4045 patents were applied for in 2023.

On September this year, two patents on energy storage safety technology of Sunshine power were published, namely "energy storage system" and" energy storage battery box and energy storage system ". The former architecture realizes the networking of fire protection system by reusing the energy management communication network of energy storage system, while the latter's technical solution solves the problem of poor fire resistance of energy storage battery box in the existing technology.

In terms of energy storage safety technology verification, Sunshine power has the courage to break through. This year, it launched the burning test of the world's first battery cabin real machine. Without taking any external fire control measures, ignite four container-type PowerTitan units (total 2.75MW/10MWh +). Explosion relief through air pressure sensing, multi-layer fire-resistant structure and doubleWith many advanced designs such as heavy compartment structure, the structural integrity of the energy storage cabinet is protected, and the fire does not spread during the 4-hour combustion process.

Photovoltaic faucet strong cross-border energy storage

jingke Energy's R & D investment in 2023 was 6.899 billion yuan, accounting for 5.81 percent of operating income, up 22.87 percent year-on-year, and 1820 New inventions were obtained in 2023.

Since this year, Jingke Energy has applied for multiple pieces. Energy storage patent, involving multiple dimensions such as energy storage cabinet, energy storage module, energy storage battery pack, and energy storage heat management. On November 5, the patent application of Jingke Energy "an energy storage device and thermal management control method" was published. The abstract shows that the application can adjust the temperature in the battery compartment, making the battery pack work at a suitable temperature.

From the early Poly crystalline components to the later single crystal technology, as well as the current leader of TOPCon technology, photovoltaic leading Crystal energy attaches great importance to technology research and innovation. It is this idea of re-research and development that Jingke Energy has established a huge energy Storage Technology. The product R & D team has invested a lot of resources to complete the transformation from energy storage system integrators to cell, EMS, BMS manufacturers and the entire system solution developers in a short period of time.

industry "unicorn" deepen technical layout

the R & D investment of Haibo Sichuang increased year by year from 2021 to 2023, which were 55.9378 million yuan, 94.1002 million yuan and 178.5662 million yuan respectively, and the R & D personnel accounted for more than 30%.

Haibo Sichuang plus-sized research layout of energy storage converter technology. On August 20, Haibo sichuang's patent application for "an energy storage converter system and control method" was published. The abstract showed that the application provided an energy storage converter system and control method. The energy storage converter system includes energy storage module, DC/DC module, DC/AC module, Contactor and controller; The controller is respectively connected to DC/DC module, DC/AC module and contactor, the energy storage converter can be directly connected to the power grid with different AC voltages.

On September 24 this year, the joint research center of key technologies of electrochemical energy storage system network established by Haibo Sichuang and Tsinghua University (power state heavy) was officially unveiled, the joint research center will focus on three core issues: key technology research and product development of new energy storage converter, network control technology of new energy storage system, and broadband oscillation suppression technology of new energy storage system.

Judging from the development level of energy storage technology, most of China's technical routes are at the most advanced level in the world.

Taking "lithium ion battery" as the theme word, 53440 special items were retrieved on the official website of the State Intellectual Property Office.Li, Representative enterprises include Ningde era, BYD, Yiwei lianneng, etc.

On November 12, these three enterprises all made progress in the application of battery technology patents, involving the improvement of battery energy density, battery pole piece and electrolyte performance.

The patent application abstract of "battery monomer, battery and electric device" in Ningde era shows that this application discloses a kind of battery monomer, battery and electric device, the electrode terminal and the electrode lug can share a part of the space in the first direction, which can effectively reduce the size of the part of the electrode terminal protruding from the shell and reduce the overall size of the battery monomer, at the same time, it can make full use of the space between the main part and the shell to improve the utilization rate of the space. On the basis of a certain size of the battery cell, it is conducive to increasing the space to accommodate the main part, thus, it is beneficial to improve the energy density of the battery cell.

BYD's patent application summary of "a battery pole piece and its preparation method, battery and electric device" shows that according to the battery pole piece of this application, crosslinking agent is added at the stage of preparing slurry, the high temperature during drying enables the crosslinking reaction between the adhesive and the crosslinking agent. In this way, the low viscosity brought to the slurry by the adhesive before crosslinking can be utilized, thus increasing the amount of active material and increasing the solid content of the slurry, it can also realize the high bonding strength brought to the pole piece after the adhesive is cross-linked, especially the bonding strength between the pole piece and the collector fluid is appropriate.

According to the patent application summary of "an electrolyte and battery", the invention provides an electrolyte and battery, which includes lithium salt, organic solvent, carbonate additive and the first functional additive. The electrolyte can further improve the stability of the negative electrode interface and the stability of the electrolyte during use, reduce the interfacial side reaction, and optimize the high temperature storage performance and the normal temperature and high temperature cycle performance of the battery.

taking "liquid flow battery" as the subject word, 3840 patents were retrieved on the official website of the State Intellectual Property Office. Representative enterprises include Dalian Rongke, Shanghai Electric, Beijing puneng, etc.

On October 11, Dalian Rongke obtained the patent authorization of "an iron-vanadium liquid flow battery electrolyte, preparation method and liquid flow battery. Abstract shows that patents include: positive electrolyte and negative electrolyte; Positive electrolyte includes iron ion and first vanadium ion; Negative electrolyte includes second vanadium ion, and negative electrolyte does not contain iron ion; Electrolyte meets: c2> C3, and (C1 + C2) ×v1 = C3 ×v2. When the range of C2 ≥ C3 and (C1 + C2)× V1 = C3 × V2 is met, the metal ions of at least one of the positive electrolyte and the negative electrolyte can be fully involved in the reaction, since metal ions can be fully utilized, the maximum discharge energy is ensured to provide the energy density of the electrolyte; In addition, since there is no iron ion in the negative electrolyte, therefore, there is no problem that iron ions migrate to the positive electrode, so that the amount of rechargeable active material in the positive and negative electrode is balanced, and the discharge capacity of the battery can be further improved.

On July 12, Beijing puneng published the patent application for "a mixed liquid system and method applied to liquid flow battery system. Abstract shows that the liquid flow battery system includes at least two liquid flow battery modules, each liquid flow battery module includes: positive electrode, negative electrode storage liquid tank, positive electrode and negative electrode storage liquid tank are arranged in sequence to obtain positive electrode, negative electrode storage liquid tank area, the mixing system includes: battery management module, mixer and storage liquid tank corresponding to the positive and negative electric pump areas respectively, and the first valve is set on each storage liquid tank liquid outlet pipe; when the battery management module detects that the SOC deviation between the battery modules is greater than the preset threshold, the battery management module sends a start command to the mixer and the electric pump, and send opening instructions to the first valve of at least two target storage liquid tank in each storage liquid tank area; The mixer mixes the electrolyte of the target storage liquid tank; Electric pump extracts the electrolyte, and deliver the mixed electrolyte back to the target storage liquid tank. This application embodiment realizes the mixing of electrolyte in storage liquid tank and maintains the charge and discharge balance.

on October 18, Shanghai Electric's "inverter cabin system for bipolar liquid flow energy storage" Patent Gazette. Abstract shows that the utility model inverter cabin includes high voltage chamber, transformer chamber and low voltage chamber, high voltage chamber integrated ring network Cabinet, including incoming cabinet, metering cabinet, ptcabinet and outlet cabinet, and incoming cabinet is used to connect the external power grid, and configure high-voltage circuit breaker and isolating switch to realize the separation between the system and the power grid. The metering cabinet integrates the metering watt-hour meter, and transmits the sampled electric energy data to the background in real time. The ptcabinet realizes the measurement of high voltage, the voltage circuit of the measuring meter is provided, and the outlet cabinet is connected to the ring network Cabinet to the step-up transformer; A step-up transformer is placed in the transformer room, and the low voltage room is integrated with energy storage converter, DC converter, isolation transformer, dual power conversion switch, UPS, BMS and power distribution cabinet. The utility model inverter cabin system is suitable for high-power liquid flow energy storage projects, and can be directly connected to 10kV power grid by integrating boost transformer and ring network Cabinet.

Taking "sodium ion battery" as the subject word, 7716 patents were retrieved on the official website of the State Intellectual Property Office. Representative enterprises include Zhongke Haina, Ningde era, BYD, etc.

On November 12, zhonghena obtained the patent authorization of "battery shell, battery and electrical equipment. The abstract shows that the battery shell of the utility model can effectively increase the storage space of electrolyte in the battery shell by setting a part suitable for accommodating electrolyte on the inner wall surface of the accommodating cavity, therefore, it is beneficial for the pole core to be fully immersed in electrolyte, which can effectively improve the cycle performance of the battery, and is beneficial for the battery with high Assembly ratio to maintain good cycle performance.

On November 12th, Ningde era's patent application for "positive electrode sheet and its preparation method, sodium ion battery, battery module, battery pack" was announced. Abstract shows that the application involves a kind of positive electrode sheet. By setting a sodium supplement layer between the positive collector and the positive film layer, and controlling the thickness of the sodium supplement layer and the thickness of the positive film layer to meet a certain relationship, it can improve the bulk energy density of sodium ion battery.

on September 20, BYD's patent application for "a three-phase composite sodium storage material and its preparation method and application" was announced. The abstract shows that the synergy among FeS, V3S4 and C parts of the three-phase composite sodium storage material provided by the embodiment of this application, it can better improve the cycle stability and rate performance of the three-phase composite sodium storage material as the electrode material, thus reducing the rate of decline in electrochemical performance of the sodium ion Battery during charging and discharging.

Taking "solid-state battery" as the subject word, 3377 patents were retrieved on the official website of the State Intellectual Property Office, representing enterprises including Wei Lan new energy and Nandu power supply.

On October 1, Wei Lan new energy "a preparation method of halide solid-state electrolyte, preparation method of solid-state battery pole piece and solid-state battery" patent application was published. Abstract shows that the electrolyte prepared by this method has uniform particle size and high ionic conductivity, and does not need ball milling after being applied to batteries, thus reducing energy consumption and can be produced in large-scale industrialization. The invention also provides a preparation method of solid-state battery pole piece, which does not need to add solid electrolyte in addition, mixing two reaction solutions and immersing them in the positive electrode piece, the solid electrolyte layer is made in situ on the surface of the original electrode layer by reaction, thus making the interface of the obtained solid-state battery electrode more firm.

On October 1, Nandu power "a rare earth sulfide solid electrolyte, preparation method and application" patent application was published. The invention discloses a rare earth sulfide solid electrolyte, preparation method and application, belonging to the technical field of lithium ion batteries. The chemical composition of rare earth sulfide solid electrolyte is: li10a1-0.75 xBxP2S12, among which, 0.01 ≤ x ≤ 0.2; Among them, A is selected from one of Silicon and tin; B is selected from cerium, lanthanum, neodymium, samarium, one or more of scandium elements. The invention discloses a rare earth sulfide solid electrolyte, which is doped with rare earth elements into li10 aP2S12(A is Si, Sn) sulfide solid electrolyte not only effectively improves the ionic conductivity of solid electrolyte, but also shows excellent cycle performance after being assembled into lithium ion battery.

Energy storage technology has become a key solution to balance energy supply and demand and improve power system stability and flexibility. The connection of large-scale new energy puts forward higher requirements for power dispatching, power connection and power grid operation, making virtual power plants, the research and development and innovation of smart grid technologies such as micro-grid and power electronics technologies such as network structure have also received special attention.

Taking "virtual power plant" as the theme word, 1766 patents were retrieved on the official website of the State Intellectual Property Office. The application enterprises involved in Southern Power Grid, Sunshine power supply, vision, Xinyuan intelligent storage, Ronghe yuan storage, nanruijibao, ningde era, wotai energy, etc.

Taking "Network structure" as the theme word, 1766 patents were retrieved on the official website of the State Intellectual Property Office. The application enterprise involved sunshine power supply, Kehua digital energy, Huawei, Guodian Nanrui, Hewang electric, Neng electric, sifang Jibao, etc.

Taking "micro-grid/micro-grid" as the theme word, 7432 patents were retrieved on the official website of the State Intellectual Property Office. The application enterprises involved in Sunshine power supply, Suoying electric, Huawei, shuangdeng, Tianhe energy storage, Guodian Nanrui, hewang electric, Jinfeng zero carbon, Xu Ji, nanruijibao, etc.