Lithium battery manufacturers talk about power lithium battery module design requirements and connection methods

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Lithium-ion battery manufacturers talk about power lithium ion battery module design requirements and connection methods. The dynamic lithium-ion battery module system design should be presumed to meet the power requirements and other designs of the whole vehicle, while considering the internal structure and safety and management design of the battery system itself. Some of the overall and versatility principles should be considered when designing, including good security, high ratio energy, high ratio power, temperature adaptability, long service life, etc.

Lithium-ion battery manufacturers talk about the design requirements of the dynamic lithium-ion battery module? The lithium-ion battery module can be understood as a combination of lithium ion batter to combine the string, and install a monomer battery monitoring and the intermediate product of the battery formed after the management device. Its structure must support, fix, and protect the battery. ◆ Structural design requirements are reliable: anti-gasification; process controllable: no soldering, duly welding, ensuring 100% of the battery, low cost: Pack production line automation cost, including production equipment, production loss; Repair: Lithium-ion battery pack is easy to maintain, repair, low cost, and the battery can be easy to use; to prevent the heat transfer isolation, prevent the heat loss of control too fast, or put this step to the Pack design and then consider.

◆ Thermal Design With the pursuit of high-performance electric vehicles, forcing the soft bag battery to have an active thermal management structure. The power lithium-ion battery module is stacked by the electrical core, and there is a liquid cooler arranged between the battery cells, which guarantees that each of the cells have a large surface contact to liquid cooling board. Of course, the soft bag should be mature, it is not easy to make liquid cooling technology, which must consider the fixation, sealing, insulation, etc.

of liquid cold plates. ◆ Electrical design electrical design, contains two parts: low pressure and high pressure. Low voltage design, generally considering several functions.

By signaling wire harness, the battery voltage, temperature information is collected to the module from the control board or the so-called module controller installed on the module; the module controller is generally designed to design a balance function (active equalization or passive equalization or both Coefficient); a small amount of relay-off control functions can be designed on the slave controller, or on the module controller; connect the module information to the module information through the CAN communication connection module controller and the main controller. High pressure design, important is the string parallel joint between the battery and the cell, and the external connection between the module, designing the connection conductivity between the lithium-ion battery module and the module, and the general module is only considered in series. ◆ Safety design safety design can be divided into three retrogress requirements: good design, do not have accidents; if it doesn't work, it is best to war well in advance, give people a reflection time; failure has occurred, designed The goal becomes turned to prevent accidents from spreading too fast.

◆ Lightweight design light quantization design, the most important purpose is to pursue battery life, eliminate all the burden, lightly. If it is lighter, it is even more happy to follow the cost. Lightweight roads, such as improved battery energy density.

Dynamic lithium-ion battery module The common lithium-ion battery module type, according to the connection of the electrical cell and the conductive bus bar, can be divided into three forms of welding, snail. Welding is applied to the welding process of lithium ion battery modules, important laser welding, ultrasonic welding and resistance welding. Among them, laser welding and industrial robots are gradually become the main force of automated module production lines.

Welding process, high efficiency, easy to achieve automation production. Screw, use the connection between the electrical cell and the busbar with the anti-locked screw. This form is simple in the process, but it is important to apply the battery system that is relatively large.

Especially the square battery screw structure is more. The benefit of mechanical crimping is that the disassembly is flexible, post-maintenance and secondary recycling success rate is high. The disadvantage is that the assembly efficiency is difficult to increase significantly.

If the mechanical connection structure is designed to be insufficient enough, the possibility of contact resistance changes in long-term road vehicle operating environments. Summary: The same pillar type battery, in a group of lithium-ion batteries, the connection process will also have a great difference, and there is a respective advantages and disadvantages. Regarding the current dynamic lithium battery industry, the degree of automation of the module is relatively high, and the advantages of application robots and special equipment are obvious due to complexity of their processes, the requirements of work environment, etc.

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