Common module for lithium ion batteries

Abstract

The invention discloses a common module for lithium ion batteries, which belongs to the field of electric-vehicle-mounted batteries, and comprises a shell and a lithium battery pack, wherein the shell consists of a U-shaped box body, a top cover, a front radiation plate and a rear radiation plate; the lithium battery pack consists of a plurality of chip type batteries which are connected in series, parallel or both series and parallel; the chip type batteries are arranged in space defined by the U-shaped box in parallel; and each two adjacent chip type lithium batteries are fixed by foam glue, so that a lithium battery expansion gas is formed between the two adjacent chip type lithium batteries. In the invention, an expandable and strong isolating layer is arranged between each two adjacent lithium batteries, so that failed lithium batteries can be isolated effectively to prevent accidents such as combustion, explosion and the like and battery cell grade impact-proof protection can be realized.

Description

Technical field: [0001] The invention relates to lithium-ion power batteries for electric vehicles, in particular to a general-purpose module of lithium-ion batteries with different sizes and shapes, different voltages and capacities that can be constructed through series and parallel connections. Background technique: [0002] Using ordinary lithium-ion batteries, the battery core cannot be made particularly large and long in the coating, slicing, rolling, and winding processes, which means that the capacity of a single lithium battery can only be made small, while electric The power supply of the car requires a battery with a large capacity. For this reason, the current common practice is to connect multiple lithium batteries in parallel to form a battery pack, so that the battery capacity can be increased to meet the power capacity requirements of electric vehicles. For example, the Chinese utility model patent ZL200620107436.1 discloses a high-power lithium-ion power bat...

AI Technical Summary

Problems solved by technology

For example, the Chinese utility model patent ZL200620107436.1 discloses a high-power lithium-ion power battery. After stacking and connecting multiple single cells in parallel, they are surrounded by PP tape to bundle several single cells. As a whole, so that the adjacent single cells are in close contact. The disadvantages of this structure are: 1. Since the single cells will expand when heated, and the expansion will be affected by the adjacent single cells. Squeeze restrictions, so when the two forces collide together, accidents such as combustion and explosion are prone to occur; 2. There are mutual interference factors between adjacent single cells, when one or several cells are short-circuited and other reasons When a failed cell occurs, it is easy to affect the normal work of other cells

[0003] In addition, the management module of the existing lithium battery pack only manages and controls the lithium battery pack constructed by connecting multiple lithium batteries in series and parallel, that is, a dedicated management module is used, and lithium battery packs of different structures need to be designed differently. The management module to match, which brings troubles to the manufacturer's manufacturing, but also increases the production cost

At the same time, since the management module monitors and manages the lithium battery pack as a whole, when a certain lithium battery in the lithium battery pack fails or is damaged, the entire lithium battery pack will be scrapped, resulting in a serious waste of resources

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