What are the planning requirements for power lithium battery modules?

Reliable structure: anti-sensation and anti-fatigue; controllable process: no over-welding or false welding, ensuring 100% no damage to the battery cell; low cost: low cost of automation of the PACK production line, containing production equipment and production loss; easy to split: lithium battery The package is easy to protect and repair, low cost, and the battery cell can be used in steps; to achieve the necessary heat transfer barrier, and to prevent the thermal runaway from extending too quickly, this step can also be considered in the pack planning. With people's pursuit of high-performance electric vehicles, the soft-pack batteries are forced to have an automatic thermal management structure. The power lithium battery module is made up of stacked cells, and there are liquid cooling plates arranged at a distance between the cells, which ensures that each cell has a large surface that contacts the liquid cooling plate. Of course, it is not easy to get liquid cooling skills for soft-pack batteries, and it is necessary to consider the fixing, sealing, insulation and so on of the liquid cooling plate. Electrical planning contains two parts: low voltage and high voltage. In low-voltage planning, several functions are generally considered. After the signal collection harness, the battery voltage and temperature information are collected to the module from the control board or the so-called module controller installed on the module; the module controller is generally planned for equalization functions (automatic equalization may be forced to equalize or two Coexistence); a small number of relay on-off control functions can be planned on the slave control board or the module controller; the module controller and the main control board are connected through the CAN communication to transmit the module information. High-voltage planning is mainly about the series and parallel connection between the battery cell and the battery cell, as well as the outside of the module. Planning the connection and conduction method between the lithium battery module and the module, generally only consider the series connection method between the modules. Safety planning can be divided into three retrogressive requirements: good planning to ensure that no incidents occur; if not, if incidents occur, it is best to give early warning and give people a reflection of the moment; if the fault has occurred, the planning policy is right. Become preventing the incident from spreading too quickly. Lightweight planning, the most important goal is to pursue the cruising range, eliminate all unnecessary burdens, and go lightly. And if lightweighting can be combined with cost reduction, it will be even more satisfying. There are many ways to reduce weight, such as increasing the energy density of batteries. Common types of lithium battery modules can be divided into three methods: welding, screwing, and mechanical crimping according to the connection method of the battery cell and the conductive busbar. Welding is used in the welding process of lithium battery modules, including laser welding, ultrasonic welding and resistance welding. In the meantime, laser welding cooperative industrial robots are gradually becoming the main force of the automated module production line. The welding process has high efficiency and is easy to complete automated production. Screw connection, use anti-loosening screws to fix the connection between the battery core and the busbar. This method is relatively simple in technology, but it must be used in a battery system with a relatively large monomer capacity. In particular, there are many screw connection structures for prismatic batteries. The advantages of mechanical crimping are the dexterous disassembly and assembly, the later protection and the high success rate of secondary recovery. The disadvantage is that the assembly efficiency is difficult to be greatly improved. If the mechanical connection structure planning is not reasonable enough, the contact resistance is likely to change in a long-term road vehicle operation environment. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Lithium battery UPS power supply installation matters