Introduction to the composition of the battery module

1. Reliable structure: anti-vibration and anti-fatigue; 2. Controllable process: no over-welding or false welding to ensure 100% damage-free cell; 3. Low cost: low cost of automation of PACK production line, including production equipment and production loss; 4. Easy to dismantle: the battery pack is easy to maintain and repair, low cost, and the batteries can be used in cascades; 5. Heat transfer isolation: necessary heat transfer isolation to prevent heat runaway from spreading too quickly. The physical structure of the thermal design soft-pack battery determines that it is not easy to explode. Generally, only the shell can withstand high enough pressure can it be exploded. If the internal pressure of the soft-pack battery is large, the pressure will be released from the edge of the aluminum plastic film , Leakage. At the same time, the soft-packed cell is also among several cell structures, which has the best heat dissipation. In electrical design, low-voltage design generally has several functions to consider. Through the signal collection harness, the battery voltage and temperature information are collected to the module slave control board or the so-called module controller installed on the module; the module controller is generally designed with equalization functions (active equalization or passive equalization or both Coexistence); a small number of relay on-off control functions can be designed on the slave control board or on the module controller; the module controller and the main control board are connected through CAN communication to transmit the module information. For high-voltage design, the important thing is the series and parallel connection between the battery core and the battery core, as well as the outside of the module, the design of the connection and conduction method between the module and the module, generally only consider the series connection between the modules. These high-voltage connections must meet two requirements: First, the conductive parts and contact resistance between the cells must be evenly distributed, otherwise the cell voltage detection will be interfered; secondly, the resistance must be small enough to prevent electrical energy from being transmitted on the path. waste. Safety design Safety design can be divided into 3 regressive requirements. Good design ensures that no accidents occur; if it does not work, if an accident occurs, it is best to give early warning and give people a reflection of the time; if the failure has occurred, the design goal is to prevent the accident from spreading too quickly. Lightweight design Lightweight design, the most important purpose is to pursue the cruising range, eliminate all unnecessary burdens, and go lightly. And if lightweighting can be combined with cost reduction, everyone will be even more happy. There are many ways to lighten the weight, such as increasing the energy density of the battery; in the detailed design, the pursuit of lightness and thinness of the structure while ensuring the strength (such as choosing a thinner material and digging a larger hole in the plate); replacing it with aluminum Sheet metal parts; use new materials with lower density to build shells, etc. Standardization Design Standardization has been the long-term pursuit of large industries, and standardization is the cornerstone of reducing costs and improving interchangeability. Specific to the power lithium battery module, there is also a great purpose of echelon utilization. Having said that, the reality is that the single unit has not been standardized, so the standardization distance of the module is farther. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Introduction to the characteristics of lithium-ion power lithium batteries