CN-122000537-A - Battery cell fireproof structure and battery module

Abstract

The invention relates to the technical field of battery safety and discloses a battery core fireproof structure and a battery module, wherein the battery core fireproof structure comprises an end plate, a side plate and an epoxy plate, wherein the end plate is arranged at the end part of a battery core group; the side plates are arranged on the side surfaces of the battery cell groups, two ends of each side plate are connected with the two end plates, the epoxy plates are arranged on the end plates, through grooves are formed in one side, close to the side plates, of each end plate, and the epoxy plates are attached to the side plates so that projections of the epoxy plates in the first direction cover the corresponding through grooves. Through setting up the epoxy board, the epoxy board blocks the direct injection route of high temperature gas and granule, can not spill, protects end plate outer structure, helps restricting thermal runaway event between end plate and curb plate, has promoted whole battery system's security. And set up the air vent on the curb plate, high pressure high temperature jet flows out, prevents high pressure explosion, and forms anaerobic environment in the air vent position, further avoids oxygen to get into, avoids inside electric core to produce the explosion.

Inventors

• SHI MINJIE
• LIU ZHIHAO
• WANG ZHONGZHAO

Assignees

• 苏州精控能源科技股份有限公司

Dates

Publication Date

20260508

Application Date

20260129

Claims (10)

1. 1. The utility model provides a fire prevention structure of electric core, is applicable to electric core group (1), its characterized in that includes: The end plate (2) is arranged at the end part of the battery cell group (1); The side plates (3) are arranged on the side surfaces of the battery cell groups (1), two ends of each side plate (3) are connected with two end plates (2), and vent holes (31) are formed in the side plates (3); an epoxy plate (4), the epoxy plate (4) being mounted on the end plate (2); The side of the end plate (2) close to the side plate (3) is provided with a through groove (21), and the epoxy plate (4) is attached to the side plate (3) so that the projection of the epoxy plate (4) in the first direction covers the corresponding through groove (21).
2. 2. The cell fireproof structure according to claim 1, characterized in that the number of ventilation holes (31) on each side plate (3) is set to 6 to 8.
3. 3. The cell fireproof structure according to claim 1, further comprising a top plate (5), the top plate (5) being arranged at the top end of the cell group (1), the top plate (5) being sealingly connected to both the end plate (2) and the side plate (3).
4. 4. A cell fire protection structure according to claim 3, characterized in that the top plate (5) is made of aluminium alloy material.
5. 5. The cell fireproof structure according to claim 4, wherein the top surface of the top plate (5) remote from the cell group (1) is provided with cooling fins.
6. 6. A battery module comprising at least two of the cell fire protection structures of any one of claims 3-5, at least two of the cell fire protection structures being vertically stacked; the battery cell fireproof structure also comprises a shell (6), wherein a containing cavity is arranged in the shell (6), and the battery cell fireproof structure is fixed in the containing cavity; The side plates (3) and the side walls of the containing cavity are provided with gaps, and the top plates (5) and the top surfaces of the containing cavity are provided with gaps.
7. 7. The battery module according to claim 6, characterized in that the vent holes (31) in at least two of the cell fire protection structures form a venting area; The battery module further comprises sealing strips (7), wherein the sealing strips (7) are arranged on the side plates (3), the sealing strips (7) are arranged in a plurality, and the sealing strips (7) are arranged on two sides of the ventilation area; The outer side of the sealing strip (7) is abutted to the side wall of the accommodating cavity, and two ends of the sealing strip (7) are arranged corresponding to two ends of the ventilation area.
8. 8. The battery module according to claim 7, wherein the housing (6) is further provided at both ends with vent holes (61), the vent holes (61) being in communication with the ventilation area through a gap.
9. 9. The battery module according to claim 7, characterized in that a rigid support is further provided in the sealing strip (7).
10. 10. The battery module according to claim 7, wherein a heat insulation pad (8) is placed between two adjacent cell fireproof structures.

Description

Battery cell fireproof structure and battery module Technical Field The invention relates to the technical field of battery safety, in particular to a battery core fireproof structure and a battery module. Background With the rapid development of new energy automobiles and energy storage industry, the safety performance of lithium batteries serving as a core power source is becoming an important point of industry attention. The ternary lithium battery has the advantages of high energy density, good low-temperature performance and the like, and is widely applied to the fields of electric automobiles and the like. However, ternary materials have poor stability at high temperatures, are prone to thermal runaway under conditions of overcharging, short-circuiting, mechanical abuse and the like, release a large amount of heat and combustible gas, and are extremely prone to causing fires and even explosions if improperly handled. In the existing air cooling design, in order to ensure heat dissipation, a ventilation channel is usually reserved in the battery pack, the module structure is also relatively open, and when thermal runaway occurs, a large amount of external air can be introduced, oxygen is provided for high-temperature eruption, the combustion risk is obviously increased, and even interlinked heat spreading is caused. Disclosure of Invention In view of this, the invention provides a battery core fireproof structure and a battery module, so as to solve the problem that external air can be largely gushed in when thermal runaway occurs, oxygen is provided for high-temperature eruption, combustion risk is remarkably increased, and even interlinked heat spreading is caused. In a first aspect, the present invention provides a fire protection structure for a battery cell, which is suitable for a battery cell group, and includes: The end plate is arranged at the end part of the battery cell group; The side plates are arranged on the side surfaces of the battery cell groups, two ends of each side plate are connected with the two end plates, and vent holes are formed in the side plates; An epoxy plate mounted on the end plate; The side of the end plate, which is close to the side plate, is provided with a through groove, and the epoxy plate is attached to the side plate, so that the projection of the epoxy plate in the first direction covers the corresponding through groove. The battery cell has the beneficial effects that when a single battery cell in the battery cell group is out of control, high-temperature jet flow can be instantaneously generated, and in the traditional structure, oxygen is easy to enter through the through groove on the end plate, so that explosion is caused. According to the invention, the epoxy plate is arranged, the projection of the epoxy plate covers the through groove, the body of the epoxy plate is tightly attached to the side plate, when the high-temperature jet flow is blocked by the epoxy plate, the epoxy plate blocks the direct jet path of high-temperature gas and particles, the high-temperature gas and particles cannot leak out, the external structure of the end plate is protected, the thermal runaway event is limited between the end plate and the side plate, and the safety of the whole battery system is improved. And can prevent oxygen from entering, avoid the explosion of the internal cell. And set up the air vent on the curb plate, high pressure high temperature jet flows out, prevents high pressure explosion, and forms anaerobic environment in the air vent position, further avoids oxygen to get into, avoids inside electric core to produce the explosion. In an alternative embodiment, the number of ventilation holes on each side plate is set to 6 to 8. The battery pack has the beneficial effects that when the battery pack works normally, the plurality of ventilation holes can provide enough effective ventilation area, ensure the uniform circulation of cooling air, meet the heat dissipation requirement of the battery cell group and avoid the heat dissipation efficiency reduction and the local overheating caused by too few holes. Under the extreme condition of thermal runaway, not only the poor heat dissipation under the normal working condition possibly caused by complete sealing is avoided, but also the rapid supplement of oxygen during the thermal runaway is effectively limited, the generation of open fire is inhibited, and the controllability and the safety of the whole system for coping with the thermal runaway are improved. In an alternative embodiment, the battery cell module further comprises a top plate, wherein the top plate is arranged at the top end of the battery cell group, and the top plate is in sealing connection with the end plate and the side plate. In an alternative embodiment, the top plate is made of an aluminum alloy material. In an alternative embodiment, the top plate is provided with a heat sink away from the top surface of the cell stack. The top plate