CN219677486U

CN219677486U - Battery module and battery pack

Info

Publication number: CN219677486U
Application number: CN202320554617.2U
Authority: CN
Inventors: 胡强; 谢堃; 陶玉鹏; 赵严
Original assignee: Chery New Energy Automobile Co Ltd
Current assignee: Chery New Energy Automobile Co Ltd
Priority date: 2023-03-16
Filing date: 2023-03-16
Publication date: 2023-09-12
Anticipated expiration: 2033-03-16

Abstract

The utility model discloses a battery module and a battery pack, which belong to the technical field of battery thermal runaway protection, and comprise a module shell and a plurality of electric cores arranged in the module shell; each electric core is provided with an electric core pressure relief opening, the module shell is provided with a module pressure relief opening, and each electric core pressure relief opening is communicated with the module pressure relief opening through an independent pressure relief channel. The effective prevention and control of the thermal runaway of the battery are realized.

Description

Battery module and battery pack

Technical Field

The utility model relates to the technical field of thermal runaway of power batteries, in particular to a battery module and a battery pack.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The protection to electric core thermal runaway at present is realized mainly through installing explosion-proof valve additional on the battery module in the battery package, and the high temperature high pressure gas that produces when electric core thermal runaway discharges battery module from explosion-proof valve, realizes the protection to electric core thermal runaway.

The inventor considers that when a certain cell is out of control, the high-temperature and high-pressure gas generated by the cell needs to be diffused in the module and then discharged out of the battery module, so that the effect on other cells in the module is reduced on the basis of reducing the diffusion efficiency, and the protection effect on the thermal runaway of the cell is limited.

Disclosure of Invention

In order to solve the problems, the utility model provides a battery module and a battery pack, wherein an independent pressure release channel is arranged for each battery core in the battery module, so that when the battery core is out of control, the generated high-temperature high-pressure gas is directly discharged out of the battery module, the pressure release efficiency is improved, the other battery cores are not influenced, and the protection effect on the thermal runaway of the battery core is ensured.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, a battery module is provided, including a module housing and a plurality of battery cells disposed in the module housing; each electric core is provided with an electric core pressure relief opening, the module shell is provided with a module pressure relief opening, and each electric core pressure relief opening is communicated with the module pressure relief opening through an independent pressure relief channel.

In a second aspect, a battery pack is provided, including a battery pack housing and a battery module set forth in the first aspect disposed in the battery pack housing.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the independent pressure release channel is arranged for each electric core in the battery module, so that when the electric core is in thermal runaway, the generated high-temperature high-pressure gas is directly discharged out of the battery module, the pressure release efficiency is improved, the other electric cores are not influenced, and the protection effect on the thermal runaway of the electric core is ensured.

2. According to the utility model, the module pressure relief opening is arranged on the module bottom plate, and the battery core pressure relief opening faces the module bottom plate, so that the battery core can relieve pressure in a downward pressure relief mode, when the power battery is used on an electric vehicle, the possibility of damaging a passenger cabin in thermal runaway is reduced to a certain extent, and the driving safety is improved.

Additional aspects of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is an exploded view of the disclosed module of example 1;

FIG. 2 is a diagram showing the structure of the upper relief vent disclosed in example 1;

FIG. 3 is a schematic diagram of a pressure relief vent structure of the module disclosed in example 1;

fig. 4 is an exploded view of the battery pack disclosed in example 2.

Wherein: 1. bottom backplate, 2, frame, 3, battery module, 4, battery package upper casing, 5, module upper cover, 6, electric core, 7, pressure release passageway, 8, go up the pressure release mouth, 9, module pressure release mouth, 10, module bottom plate.

The specific embodiment is as follows:

the utility model will be further described with reference to the drawings and examples.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.

Example 1

In this embodiment, a battery module is disclosed, as shown in fig. 1, including a module case and a plurality of battery cells 6 disposed in the module case; each cell 6 is provided with a cell pressure relief opening, a module pressure relief opening 9 is formed in the module shell, each cell pressure relief opening is communicated with the module pressure relief opening through a separate pressure relief channel 7, gas inside the cell can sequentially pass through the cell pressure relief opening, the pressure relief channel 7 and the module pressure relief opening, the battery module is discharged, effective protection against thermal runaway of the cell is achieved, and because the separate pressure relief channel 7 is formed in each cell, when thermal runaway occurs in a certain cell, the high-temperature and high-pressure gas of the cell is directly discharged out of the module through the pressure relief channel corresponding to the cell, and the influence on other cells in the module is avoided, so that effective protection against thermal runaway of the cell is achieved.

As shown in fig. 2 and 3, a boss is disposed between the module housing and each cell 6, and a pressure relief channel 7 penetrating through the boss is disposed on each boss, one end of the pressure relief channel 7 is communicated with the pressure relief opening of the cell, and the other end of the pressure relief channel 7 is communicated with the pressure relief opening 9 of the module.

Set up a plurality of pressure release mouthfuls 8 on the module shell inner wall, set up module pressure release mouthful 9 on the module shell outer wall, the one end and the electric core pressure release mouth intercommunication of every pressure release passageway 7, the other end and the last pressure release mouth 8 one-to-one intercommunication of pressure release passageway 7, all go up pressure release mouthfuls 8 and module pressure release mouthfuls 9 intercommunication, has realized the intercommunication between pressure release passageway 7 and the module pressure release mouth 9.

The pressure release openings of the battery cells are in one-to-one correspondence with the positions of the upper pressure release openings 8, and the pressure release channels 7 are cylindrical, so that gas in the battery cells is transmitted to the positions of the upper pressure release openings 8 through the straight paths, the paths for discharging high-temperature high-pressure gas in the battery cells are shortened, and the efficiency of the gas discharging module is improved.

In order to realize the quick discharge module of gaseous in the battery module, set up a plurality of module pressure release mouthfuls 9 on the module shell, every pressure release passageway 7 all communicates with all module pressure release mouthfuls 9, when the electric core takes place thermal runaway, the high temperature high pressure gas in the electric core can be through a plurality of module pressure release mouthfuls 9, quick discharge battery module, further improves the efficiency of gaseous discharge battery module in the electric core.

In particular, the module housing disclosed in this embodiment includes a module upper cover 5 and a module bottom plate 10 that are connected, and the battery cell 6 is located between the module upper cover 5 and the module bottom plate 10.

The module pressure relief opening 9 sets up on module bottom plate 10, and electric core pressure relief opening is towards module bottom plate 10, and the boss is located between electric core pressure relief opening and the module bottom plate 10 for electric core can adopt the mode of downward pressure release to carry out the pressure release, when just being used for this power battery on the electric motor car, harm passenger cabin's possibility when having reduced thermal runaway to a certain extent has improved the security of driving.

Wherein, the one side of module bottom plate 10 towards the electricity core sets up pressure release mouth 8, and module bottom plate 10 adopts hollow structure, realizes all last pressure release mouthful 8 and the intercommunication between the module pressure release mouth 9.

In order to prevent the generated high-temperature high-pressure gas from entering other cells when a certain cell is out of control, a pressure release valve is arranged at the pressure release opening of each cell, and the pressure release valve is a one-way valve, so that the gas can only be discharged from the cell into the pressure release channel, and the gas in the pressure release channel cannot enter the cell.

The electric core and the boss of this embodiment adopt the structure to glue, reduce part quantity, reduce the assembly degree of difficulty to reduce battery module's height, improve the gas exhaust rate in the electric core.

According to the battery module provided by the embodiment, the independent pressure release channel is arranged for each battery core in the battery module, so that when the battery core is out of control, the generated high-temperature high-pressure gas is directly discharged out of the battery module, the pressure release efficiency is improved, the other battery cores are not influenced, and the protection effect on the thermal control of the battery core is ensured; the module pressure relief opening is formed in the module bottom plate, the battery core pressure relief opening faces the module bottom plate, the battery core can be subjected to pressure relief in a downward pressure relief mode, when the power battery is used on an electric vehicle, the possibility of damaging a passenger cabin when in thermal runaway is reduced to a certain extent, and the driving safety is improved.

Example 2

In this embodiment, a battery pack is disclosed, which includes a battery pack case and a battery module 3 proposed in embodiment 1 provided in the battery pack case, as shown in fig. 4.

In order to discharge the high-temperature high-pressure gas discharged by the battery module 3 out of the battery pack, protection against thermal runaway of the battery core is achieved, an explosion-proof valve is arranged on the battery pack shell, a pressure release gap is arranged between a module pressure release opening of the battery module 3 and the battery pack shell, the pressure release gap is communicated with the explosion-proof valve, accordingly, when thermal runaway of the battery core occurs in the battery module 3, the battery module 3 reaches the explosion-proof valve through the pressure release gap through the gas discharged by the module pressure release opening, when the pressure reaches the opening pressure of the explosion-proof valve, the explosion-proof valve is opened, the gas in the battery pack is released to the outside of the battery pack, the pressure level and the temperature level inside the battery module and the battery pack are reduced, and effective protection against thermal runaway of the battery core is achieved.

The battery pack shell comprises a battery pack upper shell 4, a bottom guard plate 1 and a frame 2, wherein the battery pack upper shell 4 and the bottom guard plate 1 are respectively connected with two side surfaces of the frame, and the battery module is located between the battery pack upper shell 4 and the bottom guard plate 1.

And the battery module is detachably connected with the frame, such as by bolts.

When the battery module is installed in the battery pack shell, the module bottom plate 10 of the battery module is installed towards the bottom guard plate 1, the explosion-proof valve is installed on the bottom guard plate 1, and a pressure relief gap is formed between the bottom guard plate 1 and the module bottom plate 10, so that the battery pack can also be subjected to pressure relief in a downward pressure relief mode, and when the battery pack is used on an electric vehicle, the possibility of damaging a passenger cabin when in thermal runaway is reduced to a certain extent.

The number of the battery modules in this embodiment may be 1 or more, and 1 or more battery modules are all installed in the battery pack case.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.

Claims

1. The battery module is characterized by comprising a module shell and a plurality of electric cores arranged in the module shell; each electric core is provided with an electric core pressure relief opening, the module shell is provided with a module pressure relief opening, and each electric core pressure relief opening is communicated with the module pressure relief opening through an independent pressure relief channel.

2. The battery module of claim 1, wherein a boss is arranged between the module housing and each cell, a pressure relief channel penetrating through the boss is arranged on each boss, one end of the pressure relief channel is communicated with the pressure relief opening of the cell, and the other end of the pressure relief channel is communicated with the pressure relief opening of the module.

3. The battery module of claim 1, wherein a plurality of upper pressure relief openings are formed in the inner wall of the module housing, a module pressure relief opening is formed in the outer wall of the module housing, one end of the pressure relief channel is communicated with the battery core pressure relief opening, the other end of the pressure relief channel is communicated with the upper pressure relief openings in a one-to-one correspondence manner, and all the upper pressure relief openings are communicated with the module pressure relief opening.

4. The battery module of claim 1, wherein the module housing is provided with a plurality of module relief vents, each relief channel being in communication with all of the module relief vents.

5. The battery module of claim 1, wherein the module housing includes a module top cover and a module bottom plate connected, and the cells are located between the module top cover and the module bottom plate.

6. The battery module of claim 5, wherein the module relief vent is disposed in the module base plate and the cell relief vent is oriented toward the module base plate.

7. The battery module of claim 1, wherein a pressure relief valve is provided at each cell pressure relief port.

8. A battery pack comprising a battery pack case and a battery module according to any one of claims 1 to 7 disposed in the battery pack case.

9. The battery pack according to claim 8, wherein the battery pack housing is provided with an explosion-proof valve, and a pressure relief gap is arranged between the module pressure relief opening of the battery module and the battery pack housing, and the pressure relief gap is communicated with the explosion-proof valve.

10. The battery pack of claim 8, wherein one or more battery modules are disposed within the battery pack housing.