Battery pack as an important component of electric vehicle, its structural design and manufacturing process have a vital influence on the performance and safety of power battery. This article will focus on the water-cooled structure of battery pack and the manufacturing method of power batteries, in order to provide readers with in-depth understanding and knowledge about this field.

1. Battery pack water-cooled structure
   battery pack water-cooled structure is designed to effectively reduce the working temperature of power battery, mainly including the following parts:

   • cooling plate: cooling plate is usually located outside the battery module, and the heat generated by the battery is taken away by cooling liquid circulation.
   • Coolant circuit: the coolant route consists of coolant pipes and connectors. The coolant is introduced and circulated through the internal channel of battery pack to realize heat dissipation.
   • Cooling Pump: cooling pump, as the core component of the cooling system, is responsible for pumping the cooling liquid out of the cooler and delivering it to the inside of the battery pack to form a circulating liquid supply.

2. Manufacturing method of power battery
   making power battery is a complicated process, which generally includes the following main steps:

   • cell Production: cell is the core component of power battery. Its manufacture includes the preparation of positive electrode, negative electrode and diaphragm, as well as the winding, fixing and packaging processes of cell.
   • Module assembly: cell through the module assembly process, multiple cell are combined into battery modules, including cell layout, connection and fixing steps.
   • Process test: the power battery after Module assembly needs to undergo strict process test, including cell capacity test, internal resistance test, cycle life test, etc. to ensure the quality of the battery.
   • Battery pack assembly: the battery module that has passed the test will be assembled into the final battery pack product, including the installation and connection of the water-cooled structure and the integration of the control system.

3. Advantages of water-cooled batteries
   compared with air cooling structure, water-cooled power battery has the following advantages:

   • good heat dissipation effect: the water cooling structure takes away the heat generated by the battery through cooling liquid circulation, which has more efficient heat dissipation effect and is conducive to improving the cycle life and safety of the battery.
   • Accurate temperature control: the water-cooled structure can realize accurate control of the working temperature of the battery, avoiding the decrease of battery performance and shortening of service life caused by too high temperature.
   • Strong adaptability: Compared with air cooling structure, water cooling structure has stronger adaptability in high temperature environment and can better adapt to complex working environment.

4. Development Trend of production methods
   with the rapid development of electric vehicle industry, the manufacturing method of power battery is also constantly innovating and improving:

   • material Technology Innovation: the continuous emergence of new battery materials, such as solid-state batteries and high-nickel cathode materials, will bring new development directions for the production of power batteries.
   • Process optimization: the optimization and intelligence of manufacturing methods, such as the application of automation assembly line and the introduction of intelligent manufacturing technology, will improve production efficiency and product quality.
   • Environmental protection and safety: the development of production methods will pay more attention to environmental protection and safety, including the recycling of waste batteries, the greening of production processes, etc.

Battery pack water-cooled structure and manufacturing method of power battery are crucial topics in the field of electric vehicles. Through in-depth understanding of water-cooled structure and manufacturing method, we can better understand the design and manufacturing process of power battery, and at the same time we can better grasp the development direction of power battery technology in the future.