CN-122003768-A - Battery module and battery pack

Abstract

The present invention relates to a battery module and a battery pack, and more particularly, to a battery module and a battery pack capable of adjusting internal pressure by capturing internal gas. The battery module according to one embodiment of the present invention includes a plurality of battery cells, a gas capturing unit disposed at a position adjacent to the battery cells, and a module case accommodating the plurality of battery cells and the gas capturing unit, wherein the gas capturing unit is ruptured when an internal pressure of the module case reaches a preset pressure, and regulates the internal pressure of the module case by capturing gas, prevents the internal pressure of the battery module from being higher than a predetermined level, and protects the module case of the battery module from damage due to the internal pressure.

Inventors

• Yin Juanxiong
• Pei Shanggao

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260508

Application Date

20241008

Priority Date

20231010

Claims (19)

1. 1. A battery module, comprising: A plurality of battery cells; A gas capturing unit disposed at a position adjacent to the battery cell, and A module case accommodating the gas capturing unit and the plurality of battery cells, Wherein the gas capturing unit is ruptured when the internal pressure of the cartridge reaches a preset pressure, and captures gas to adjust the internal pressure of the cartridge.
2. 2. The battery module according to claim 1, Wherein the gas capturing unit has a box shape forming an inner space in a negative pressure state.
3. 3. The battery module according to claim 1, Wherein a plurality of the battery cells are arranged in a row inside the module case, and the gas capturing unit is mounted between the plurality of the battery cells.
4. 4. The battery module according to claim 3, Wherein the gas capturing unit is installed between each of the plurality of battery cells.
5. 5. The battery module according to claim 1, Wherein a cutting line for causing breakage is formed on a surface of the gas capturing unit.
6. 6. The battery module according to claim 1, Wherein the gas capturing unit breaks at a pressure of 1 MPa or more and 4MPa or less.
7. 7. The battery module according to claim 1, Wherein the gas capturing unit is made of a metal material or a plastic material.
8. 8. The battery module according to claim 1, Wherein the gas capturing unit is compressed at a pressure of 0.1 MPa or more and 1 MPa or less and ruptures at a pressure of 1 MPa or more and 4 MPa or less.
9. 9. The battery module according to claim 8, Wherein the gas capturing unit is made of titanium or tungsten.
10. 10. The battery module according to claim 1, Wherein the gas capturing unit includes a first gas capturing unit mounted between at least some of the plurality of battery cells.
11. 11. The battery module according to claim 10, Wherein the gas capturing unit further includes a second gas capturing unit mounted adjacent to an inner surface of one side portion and the other side portion of the module case in the length direction.
12. 12. The battery module according to claim 11, Wherein a plurality of the battery cells, the first gas capturing unit, and the second gas capturing unit are arranged in a row along a length direction of the module case.
13. 13. The battery module according to claim 12, Wherein four of the battery cells are arranged in succession to form a battery cell group, and The first gas capturing unit is installed between each of the adjacent battery cell groups.
14. 14. The battery module of claim 1, further comprising: and a damper member installed inside the cartridge and contracted when an external force is applied.
15. 15. The battery module according to claim 14, Wherein the shock absorbing member comprises at least one of: A first shock absorbing member mounted between at least some of the plurality of battery cells, and A second shock absorbing member mounted adjacent to the inner surface of the cartridge.
16. 16. The battery module according to claim 14, Wherein a plurality of the battery cells, the gas capturing unit, and the shock absorbing member are arranged in a row inside the module case.
17. 17. The battery module according to claim 14, Wherein the shock absorbing member is made of polyurethane material.
18. 18. A battery pack comprising a plurality of battery modules according to claims 1 to 17.
19. 19. A battery pack, comprising: A plurality of battery cells; a gas capturing unit having a negative pressure formed therein and disposed at a position adjacent to the battery cell, and A pack accommodating the gas capturing unit and a plurality of the battery cells, Wherein the gas capturing unit breaks when the internal pressure of the set of cartridges reaches a preset pressure, and captures gas to adjust the internal pressure of the set of cartridges.

Description

Battery module and battery pack Technical Field Cross Reference to Related Applications The present application claims priority from korean patent application No. 10-2023-0134577 filed 10 months 2023 in republic of korea, the disclosure of which is incorporated herein by reference. Technical Field The present disclosure relates to a battery module and a battery pack, and more particularly, to a battery module and a battery pack capable of adjusting an internal pressure by capturing an internal gas. Background The secondary battery is a chargeable and dischargeable battery different from the primary battery that cannot be charged. A low-capacity secondary battery is used for small portable electronic devices such as mobile phones, laptop computers, and video cameras, and a high-capacity secondary battery is widely used as a power source for driving a motor in a hybrid vehicle or the like. Such secondary batteries may be used in various forms. For example, the secondary battery may be used in the form of a battery module that electrically connects a plurality of battery cells capable of charge and discharge, a battery pack that electrically connects a plurality of battery modules, and a unit that accommodates a plurality of battery cells in a pack case in a direct-assembled group. Here, the battery cell includes an electrode assembly in which a positive electrode, a negative electrode, and a separator are stacked, and an exterior material accommodating the electrode assembly. At this time, a metal can or a pouch having a resin layer formed on the surface of a metal substrate layer may be used as an exterior material, and the interior of the exterior material may be filled with an electrolyte solution. That is, the battery cell has a structure in which the electrode assembly is received in the interior of the metal can or pouch in a state of being impregnated with the electrolyte solution. On the other hand, when such a battery cell is repeatedly charged and discharged, gas is generated due to various reasons, such as an increase in the internal temperature of the battery cell to decompose an electrolyte solution, or an additive in the electrolyte solution chemically reacts during migration of positive ions. At this time, the gas generated from the battery cells increases the internal pressure of the battery module or the battery pack accommodating the battery cells, and there has conventionally been a problem in that the case of the battery module or the battery pack expands or the battery cells inside the case are damaged due to the increase in the internal pressure. Disclosure of Invention Technical problem The present disclosure is designed to solve the problems of the related art, and therefore, it is an object of the present disclosure to provide a battery module and a battery pack capable of capturing gas generated from a plurality of battery cells to prevent the internal pressure of a case accommodating the battery cells from rising beyond a certain level and to prevent the volume of the case from expanding. Technical proposal The battery module according to embodiment 1 of the present disclosure includes a plurality of battery cells, a gas capturing unit disposed at a position adjacent to the battery cells, and a module case accommodating the plurality of battery cells and the gas capturing unit, wherein the gas capturing unit is ruptured when an internal pressure of the module case reaches a preset pressure and captures gas to adjust the internal pressure of the module case. The gas capturing unit may have a box shape forming an inner space in a negative pressure state. The plurality of battery cells may be arranged in a row inside the module case, and the gas capturing unit may be installed between the plurality of battery cells. The gas capturing unit may be installed between respective battery cells of the plurality of battery cells. A cutting line for causing breakage may be formed on the surface of the gas capturing unit. The gas capture unit may rupture at a pressure of 1 Mpa or more and 4 MPa or less. The gas capturing unit may be made of a metal material or a plastic material. The gas capturing unit may be compressed at a pressure of 0.1Mpa or more and 1Mpa or less, and may rupture at a pressure of 1Mpa or more and 4 MPa or less. The gas capturing unit may be made of titanium or tungsten. In the battery module according to embodiment 2 of the present disclosure, the gas capturing unit includes a first gas capturing unit that is mounted between at least some of the plurality of battery cells. The gas capturing unit may further include a second gas capturing unit mounted adjacent to inner surfaces of one side portion and the other side portion of the module case in the length direction. The plurality of battery cells, the first gas capturing unit, and the second gas capturing unit may be arranged in a row along a length direction of the cartridge. Four of the battery cells may be arranged in su