Battery module and battery pack

Abstract

The invention relates to a battery module and a battery pack. The battery module comprises a battery cell (10) and a flame retardant device (20), wherein the battery cell (10) comprises a battery cellbody, a shell and a pressure relief device, the battery cell body and the pressure relief device are arranged in the shell, the pressure relief device is used for reducing air pressure in the shell when the battery cell (10) breaks down, and the flame retardant device (20) is used for breaking under explosion impact generated when the pressure relief device explodes so as to release a flame retardant to the battery cell (10). The battery pack comprises a plurality of battery modules. The flame retardant device can be broken through explosion impact generated by explosion of the pressure relief device when the pressure relief device explodes, and releases the flame retardant to the battery cell, so that the reaction is rapid, the fire extinguishing capacity is strong, the possibility of re-burning of the battery cell can be reduced, complete fire extinguishing is facilitated, and the safety performance of the battery module is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery module and a battery pack. Background technique [0002] When batteries are used in the field of energy storage, a large number of batteries need to be connected in series or in parallel to form a battery module, the battery modules are then assembled into a battery pack, and then the battery pack is assembled into a battery cluster, and finally the battery cluster forms a complete The energy storage unit provides a DC bus to the outside to meet the voltage demand and power storage requirements of the user side. [0003] Taking a 1MW lithium titanate energy storage container as an example, tens of thousands of batteries can be used, and the number of battery modules involved can also reach thousands. In the entire energy storage container, the use safety of each cell will affect the safety of the entire energy storage container. At present, in related technologies, ...

AI Technical Summary

Problems solved by technology

This method needs to start the injection of the fire extinguishing agent when the gas concentration reaches the set condition, and the response to the fire is somewhat lagging; and in the event of a short circuit, various collection lines may be aging and conductive due to the corrosion of the electrolyte. As a result, the battery cells will re-ignite again, and the total amount of gas fire extinguishing agent and injection time are limited, so it is difficult to completely extinguish the fire, which may affect other battery cells, thereby affecting the safety of the entire energy storage container

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