Battery system box body, battery module and vehicle-mounted energy device

Abstract

The invention belongs to the technical field of power batteries, and particularly relates to a battery system box body, a battery module and a vehicle-mounted energy device. The battery system box body comprises a shell with a mounting cavity; the shell comprises an end plate; the end plate is provided with an inner surface facing the mounting cavity; the end plate is provided with a containing cavity; the containing cavity is filled with a flame retardant; the end plate is provided with a ventilation opening communicated with the containing cavity and the mounting cavity; and the surface of the ventilation opening is covered with a breathable film. When the temperature in the mounting cavity rises, high-temperature gas can penetrate through the breathable film and continuously flow into the containing cavity from the ventilation opening, so that heat carried by the gas is absorbed by the flame retardant, heat absorption and cooling are achieved, and thermal runaway is avoided. In addition, the end plate of the box body is modified, the end plate is provided with the containing cavity which is filled with the flame retardant, an assembly structure does not need to be additionally arranged in the mounting cavity, the disassembly and assembly difficulty of the box body cannot be increased, and high practicability is achieved.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and more specifically relates to a battery system box, a battery module and a vehicle-mounted energy device. Background technique [0002] The battery module is an important part of the new energy vehicle. It mainly includes a box and a plurality of single cells installed in the box. A single battery cell will generate a lot of heat, which will cause the temperature inside the box to rise. If the heat cannot be dissipated in time and accumulates inside the box, the pressure inside the box may increase, causing the battery module to explode due to high pressure. , In addition, when the temperature continues to rise until it reaches the ignition point of a certain material component of the battery module, it may cause the battery module to catch fire and cause a fire. Therefore, effective and reliable thermal management of the battery module is required. [0003] Generally, existing batter...

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a battery system box, a battery module, and a vehicle-mounted energy device, so as to solve the problem that the battery module in the prior art cannot dissipate heat in a timely and effective manner when the battery module is locally overheated, resulting in Technical problems of battery module thermal runaway

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