Pack battery Pack is an electric car the connection mode of common battery assembly forms in fields such as energy storage system directly affects the performance, safety and service life of battery pack. This article will introduce the connection mode of Pack battery Pack, including series connection and parallel connection, and matters needing attention in the connection process.

1. Series connection
   series connection is to connect the batteries in the battery pack together in the way of connecting positive and negative poles to form a whole. Series connection can increase the voltage of the battery pack, but will not change the capacity of the battery pack. Note the following when connecting in series:

• make sure that the positive and negative poles of the battery are connected correctly to avoid short circuit or damage to the battery caused by incorrect connection.
• Select appropriate connecting lines and connectors to ensure the stability and safety of current transmission.
• During the connection process, the polarity of the battery is reversed or the connection is not firm, so as not to affect the performance and life of the battery pack.

2. Parallel connection
   parallel connection is to connect the positive poles and negative poles of multiple batteries in the battery pack to increase the capacity of the battery pack. Parallel connection can increase the total capacity of the battery pack, but does not change the voltage. Note the following when connecting in parallel:

• ensure that the capacity of each battery in the battery pack is similar to that in order to avoid excessive discharge or charging of some batteries caused by capacity mismatch.
• Monitor the status of each battery in the battery pack, find and solve the problem of uneven capacity or damage to the battery in time.
• Use appropriate balancer and management system to balance the charging and discharging state of each battery in the battery pack to ensure the stability and safety of the battery pack.

3. Precautions
   when connecting a Pack battery Pack, note the following:

• regularly check the connecting line and connector of the battery pack to ensure that the connection is firm and reliable, and avoid failure caused by loose connection.
• Avoid too long or too thin connecting line to reduce line resistance and current loss.
• Avoid excessive current impact during the connection process to reduce damage to the battery pack.