Composition Of Lithium Battery Module

This paper mainly introduces the composition of the battery module and the advantages of this design

Battery Module

The battery module can be understood as the intermediate product of the battery cell and pack formed after the lithium ion battery cells are combined in series and parallel, and the single battery monitoring and management device is installed. Its structure must support, fix and protect the electric core.

Introduction to module composition

Its basic components include: module control (often referred to as BMS slave plate), battery cell, conductive connector, plastic frame, cold plate, cooling pipe, pressing plate at both ends and a set of fasteners that combine these components. In addition to the function of gathering the single electric core and providing a certain pressure, the pressing plates at both ends often design the fixed structure of the module in the pack.

Structural design requirements

1) Reliable structure: seismic, dynamic and fatigue resistance;

2) Controllable process: no over welding or faulty welding, to ensure 100% no damage to the electric core;

3) Low cost: the automation cost of PACK production line is low, including production equipment and production loss;

4) Easy to separate: the battery pack is easy to maintain and repair, low cost, and the battery cell has good cascade utilization;

5) Heat transfer isolation: necessary heat transfer isolation to avoid rapid spread of heat out of control.

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electrical design
For low-voltage design, several functions shall be considered generally. Collect the battery voltage and temperature information to the module slave control board or the so-called module controller installed on the module through the signal acquisition harness; The module controller is generally designed with equalization function (active equalization or passive equalization or both); A small number of relay on-off control functions can be designed on the slave control board or the module controller; Connect the module controller and the main control board through CAN communication to transmit the module information.

High voltage design mainly refers to the series and parallel connection between the electric core and the electric core, as well as the external part of the module. The connection and conductive mode between modules are designed. Generally, only the series connection mode is considered between modules. These high-voltage connections need to meet two requirements: first, the conductive parts and contact resistance between the electric cores should be evenly distributed, otherwise the single voltage detection will be interfered; Secondly, the resistance should be small enough to avoid the waste of electric energy on the transmission path.
Lightweight design

The main purpose of lightweight design is to pursue the endurance mileage, eliminate all unnecessary burdens and go into battle light. And if lightweight can be combined with cost reduction, it will be even more gratifying. There are many ways to lighten, such as improving the energy density of the cell; In detail design, we should pursue the lightness of structural members while ensuring the strength (such as selecting thinner materials and digging larger holes in plates); Replace sheet metal parts with aluminum; Use new materials with lower density to make shells, etc.

Lightweight design

Standardization has been the long-term pursuit of large industry. Standardization is the cornerstone of reducing costs and improving interchangeability. As for the power battery module, there is also a great purpose of cascade utilization. That said, the reality is that the monomer has not been standardized yet, so the standardization distance of modules will be further.

The above is the introduction of the structure, composition, advantages and disadvantages of the square lithium battery brought by the modular battery manufacturer EITAISOLAR.

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