CN215816163U

CN215816163U - Shell assembly, battery module and battery pack

Info

Publication number: CN215816163U
Application number: CN202121251329.7U
Authority: CN
Inventors: 李胜
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-02-11
Anticipated expiration: 2031-06-04

Abstract

The application provides a casing subassembly, battery module and battery package, above-mentioned casing subassembly is used for the battery module, and casing subassembly injects the appearance chamber, holds the chamber and is used for holding electric core, and casing subassembly includes: the first plate body is provided with a pressure relief hole communicated with the containing cavity, and a first clamping structure is formed on the peripheral wall of the pressure relief hole; the plug body seals the pressure relief hole, a second clamping structure is formed on the peripheral wall of the plug body, the second clamping structure is in clamping fit with the first clamping structure, and the plug body is configured to be separated from the first plate body when the pressure in the containing cavity is higher than a preset pressure. Through the cock body that sets up the separation with first plate body to make when the inside high pressure that produces of battery, thereby the cock body breaks away from first plate body and makes the inside gas of battery derive by the pressure release hole, with the danger that reduces the battery explosion.

Description

Shell assembly, battery module and battery pack

Technical Field

The application belongs to the technical field of energy storage equipment, and more specifically relates to a casing subassembly, battery module and battery package.

Background

The battery is common energy storage equipment, and in the current battery, can produce a large amount of gases in the short time after the thermal runaway appears in inside electricity core, leads to the too big danger that produces the explosion of battery internal gas pressure. The safety of the battery in the related art is not high.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a casing subassembly, battery module and battery package, can promote the security performance of battery module.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the utility model provides a shell assembly for the battery module, shell assembly prescribes a limit to hold the chamber, holds the chamber and is used for holding electric core, and shell assembly includes:

the first plate body is provided with a pressure relief hole communicated with the containing cavity, and a first clamping structure is formed on the peripheral wall of the pressure relief hole;

the plug body seals the pressure relief hole, forms the second block structure on the perisporium of plug body, and the cooperation of second block structure and first block structure joint is held when holding the intracavity pressure and being higher than the pressure of predetermineeing, and the plug body breaks away from first plate body.

Among the above-mentioned scheme, first aspect, through the cock body that sets up can with first plate body separation to when making when the inside high pressure that produces of battery, thereby the cock body breaks away from first plate body and makes the inside gas of battery derive by the pressure release hole, with the danger that reduces the battery explosion. On the other hand, the plug body in the embodiment is mounted on the first plate body of the battery in a clamping manner, and compared with other alternatives considered by the inventor, the plug body is not easy to be punctured in the use process of the battery and has better safety performance in the structure that the sealing film is attached to the inner wall surface of the first plate body. Compared with other alternatives considered by the inventor, the structure that the cracks are arranged on the first plate body (the cracks cracked after being pressed are used for replacing the pressure relief holes and the plug body), the processing technology is simpler and more mature, the requirement on manufacturing equipment is lower, and the design cost and the processing cost are reduced.

In a further embodiment of the present application, the first engaging structure includes a first annular protrusion disposed around a hole axis direction of the pressure relief hole, the second engaging structure includes a first annular groove disposed around the hole axis direction of the pressure relief hole, and the first annular protrusion is engaged with the first annular groove; or

The first clamping structure comprises a second annular groove arranged around the hole axis direction of the pressure relief hole, the second clamping structure comprises a second annular protrusion arranged around the hole axis direction of the pressure relief hole, and the second annular protrusion is embedded with the second annular groove.

Through adopting above-mentioned technical scheme, adopt the cooperation of annular arch and recess, can make the cock body can be by the chucking in the pressure release is downthehole, reduced the risk that the cock body breaks away from first plate body among the normal working process of battery.

In a further embodiment of the present application, a wall surface of the plug body facing away from the cavity is flush with a wall surface of the first plate body facing away from the cavity; and/or

The wall surface of the plug body facing the containing cavity is flush with the wall surface of the first plate body facing the containing cavity.

Through adopting above-mentioned technical scheme, in other words, the thickness of cock body is the same with the thickness of first plate body, and the both sides parallel and level of cock body and the both sides of first plate body, can utilize the hole space in pressure release hole as far as like this, has reduced the risk that the cock body breaks away from first plate body in the battery normal working process, and on the other hand cock body can not occupy the effective space of battery yet, has promoted the energy density of battery.

In a further embodiment of the application, the cavity is used for arranging a plurality of battery cells arranged side by side, the first plate body is arranged on the same side of each battery cell, a boundary gap is formed between every two adjacent battery cells, and an orthographic projection of each boundary gap on a wall surface of the first plate body facing the battery cells is a first projection;

the number of the pressure relief holes and the number of the plug bodies are multiple, the first plate body is provided with at least one pressure relief hole in each position of the first projection, and each plug body is arranged in the corresponding pressure relief hole.

Through adopting above-mentioned technical scheme, when electric core quantity in the battery is a plurality of, can make the gas that electric core produced can be discharged fast through setting up a pressure release hole between per two electric cores, reduced the danger of battery explosion.

In a further embodiment of the present application, the number of the pressure relief holes is twice the number of the first projections, and two ends of each first projection are respectively provided with one pressure relief hole.

Through adopting above-mentioned technical scheme, all set up the pressure release hole through the both ends at electric core for the gaseous homoenergetic that the electric core any position produced can be by quick derivation.

In a further embodiment of the present application,

the cavity is used for arranging a plurality of electric cores which are arranged side by side, and the first plate body is arranged at the same side of each electric core;

the shell assembly further comprises a second plate body, the second plate body is connected with one end of the first plate body, the second plate body is used for being arranged on the same side of each battery cell, and the first plate body and the second plate body are located on different sides of each battery cell;

the cavity is formed in the second plate body, a first air guide hole is formed in the wall surface, facing the containing cavity, of the second plate body, second air guide holes are formed in other wall surfaces of the second plate body, and the first air guide holes are communicated with the second air guide holes through the cavity.

By adopting the technical scheme, the air guide hole is formed in the other side of the battery cell, so that the air guide property in the battery is improved.

In a further embodiment of the present application, the hole axis of the first air-guide hole is perpendicular to the hole axis of the second air-guide hole; or

The hole axis of the first air guide hole is parallel to the hole axis of the second air guide hole and deviates from the hole axis of the first air guide hole.

Through adopting above-mentioned technical scheme, among the above-mentioned scheme, first air guide hole can not just to second air guide hole for inside difficult entering battery of outside foreign matter.

In a further embodiment of the present application, the battery cells are combined together to form a battery core assembly, an interlayer is disposed on one side of the battery core assembly facing the first plate, the thermal conductivity of the interlayer is a, and a is greater than or equal to 0.1W/(m.k) and less than or equal to 4W/(m.k).

Through adopting above-mentioned technical scheme, the interlayer has certain thermal-insulated effect, has reduced the influence of outside temperature to battery inside, and the interlayer still has certain heat conduction effect simultaneously for the battery is in normal during operation, and the heat can be by good derivation.

The second aspect of the present application also provides a battery module, including:

a battery cell and the housing assembly of any of the above;

and the battery cell is arranged in the containing cavity of the shell component.

Through adopting above-mentioned technical scheme, the pressure release hole on the casing subassembly can derive gas effectively when thermal runaway appears in electric core and produces a large amount of gases, has promoted the security performance.

The third aspect of the present application also provides a battery pack including the above battery module.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is an exploded view of a battery module according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of a portion of the components of the housing assembly and the plug body provided in accordance with one embodiment of the present application;

FIG. 3 is a schematic view of a plug body connected to a pressure relief hole according to an embodiment of the present disclosure;

fig. 4 is a schematic exploded view, in cross section, of a first plate provided in an embodiment of the present application;

FIG. 5 is a schematic view of a plug body connected to a pressure relief hole according to another embodiment of the present disclosure;

FIG. 6 is a schematic view of a plug body connected to a pressure relief hole according to another embodiment of the present disclosure;

FIG. 7 is a schematic view of a plug body connected to a pressure relief hole according to another embodiment of the present disclosure;

fig. 8 is a first perspective structural view of a second plate according to an embodiment of the present application;

fig. 9 is a second perspective structural view of a second plate according to an embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

10. a battery module; 100. a first plate body; 110. a pressure relief vent; 111. a first engaging structure; 200. a plug body; 210. a second engaging structure; 300. an interlayer; 400. an electric core; 500. a second plate body; 510. a first air guide hole; 520. a second air guide hole.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, when used in reference to an orientation or positional relationship shown in the drawings, are used merely to facilitate the description and simplify the description and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the appearances of the terms first and second, if any, are only for descriptive purposes and not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The present inventors considered one of the solutions in order to solve the above problems. A hole (a hole for releasing gas in the battery module, hereinafter referred to as a pressure release hole for ease of understanding) is formed in the case of the battery module, and a film is disposed inside the case and covers the pressure release hole. After thermal runaway and a large amount of gases are generated in the battery core inside the battery module, the air pressure in the shell rises and breaks through the membrane body, so that the gases in the shell can be led out through the pressure relief hole. Although the danger that the battery module explodes under the extreme condition can be reduced to above-mentioned scheme, the inventor discovers in the practical process that the easy foreign matter of membrane body structure in the use of battery module punctures to expose the inner structure of battery module, lead to the battery module to have certain potential safety hazard. In view of this, the inventor replaced the membrane structure with a block-shaped member having a certain thickness, which is disposed inside the casing and abuts against the surface wall of the casing facing the cell, but at this time, it was found that a large pressure is required to push the block-shaped member open.

In view of this, the present inventors considered another solution in which a closed or semi-closed seam having a ring shape is embossed on the case of the battery module. When the air pressure in the shell is too high, the seam position of the shell is flushed away, so that the air in the shell is led out. However, the inventors have subsequently found that the hardness of the seam region embossed in the housing is rather high due to the effect of cold hardening, and that the seam region is not necessarily capable of being punched out when the air pressure inside the housing is too great. If the seam is machined by adopting a cutter milling mode, the milling depth is difficult to accurately control, so that the limit pressure which can be borne by each seam is difficult to accurately control.

In summary, the inventors have made extensive studies and, referring to fig. 1-9, provide a housing assembly for a battery module 10 that defines a cavity for receiving a cell 400. The shell assembly in the embodiment has the advantages of high safety and simplicity in processing.

Specifically, referring to fig. 2 to 4, the housing assembly includes a first plate 100 and a plug body 200. The first board 100 is one of the boards of the housing assembly, or the first board 100 is a partial area of one of the boards of the housing assembly. The first plate 100 is provided with a pressure relief hole 110 penetrating through the inner cavity of the housing assembly, the pressure relief hole 110 has a peripheral wall arranged around the axis of the hole, and the peripheral wall of the pressure relief hole 110 is provided with a first clamping structure 111.

The plug body 200 is connected to the first plate body 100, and the plug body 200 seals the pressure relief hole 110. The plug body 200 has a peripheral wall arranged around the hole axis of the pressure relief hole 110 (the orientation in this case is referred to the position of the plug body 200 after assembly), a second engaging structure 210 is formed on the peripheral wall of the plug body 200, and the second engaging structure 210 is engaged with the first engaging structure 111. It can also be understood that the plug body 200 is connected to the first plate 100 and sealed to the pressure relief hole 110 by the cooperation of the first engaging structure 111 and the second engaging structure 210. The plug body 200 is configured such that when the pressure in the chamber is above a predetermined pressure, the plug body 200 disengages from the first plate body 100. In other words, when the pressure inside the housing assembly is greater than the preset value, the first engaging structure 111 and the second engaging structure 210 are pushed apart and separated under the action of the pressure, so that the plug body 200 is separated from the first plate body 100. After the plug 200 is separated from the first plate 100, the air in the housing assembly can be exhausted through the pressure relief hole 110, so that the interior of the housing assembly can be quickly relieved.

The preset pressure can be measured according to the previous experimental data, and the value of the preset pressure is comprehensively considered according to parameters such as the air release rate of the battery cell 400, the space size of the shell assembly, the material of the shell assembly and the like. The predetermined pressure should be less than the critical pressure causing the housing assembly to burst. When the preset pressure is determined, the specific structures of the first engaging structure 111 and the second engaging structure 210, and the specific structure, size, material, etc. of the plug 200 are designed according to the preset pressure.

The plug body 200 may be made of a flexible elastic material, and specifically, the plug body 200 may be made of a material such as rubber or silica gel.

In the above scheme, in the first aspect, the plug body 200 is provided to be separable from the first plate body 100, so that when high pressure is generated inside the battery, the plug body 200 is separated from the first plate body 100, and thus gas inside the battery is led out through the pressure relief hole 110, thereby reducing the risk of explosion of the battery. On the other hand, the plug 200 of the present embodiment is mounted on the first plate 100 of the battery by means of a snap-fit manner, and compared with other alternatives considered by the present inventors, the plug 200 is not easily punctured during the use of the battery and has better safety performance in the structure that a sealing film is attached to the inner wall surface of the first plate 100. Compared with other alternatives considered by the inventor, in the structure that the cracks are arranged on the first plate body 100 (the cracks cracked after being pressed are used for replacing the structure of the pressure relief hole 110 and the plug body 200), the processing technology is simpler and more mature, the requirement on manufacturing equipment is lower, and the design cost and the processing cost are reduced.

The specific structure of the first engaging structure 111 and the second engaging structure 210 depends on the actual requirement, and only needs to satisfy the purpose that the two can be separated from each other when the pressure in the housing assembly is higher than the predetermined pressure. In a specific embodiment, referring to fig. 5 and 7, the first engaging structure 111 may include a first annular protrusion disposed around the hole axis direction of the pressure relief hole 110, and the second engaging structure 210 includes a first annular groove disposed around the hole axis direction of the pressure relief hole 110, and the first annular protrusion is engaged with the first annular groove. In fig. 5, the cross section of the first annular projection perpendicular to the circumferential direction thereof is rectangular, and in fig. 7, the cross section of the first annular projection perpendicular to the circumferential direction thereof is triangular. Of course, in other embodiments, the cross section of the first annular protrusion perpendicular to the circumferential direction may have other shapes. The structure of the first annular groove is matched with that of the first annular protrusion, namely the structure of the first annular groove is different according to the structure of the first annular protrusion.

Similarly, in another specific embodiment, referring to fig. 3, 4 and 6, the first engaging structure 111 includes a second annular groove arranged around the hole axis direction of the pressure relief hole 110, and the second engaging structure 210 includes a second annular protrusion arranged around the hole axis direction of the pressure relief hole 110, and the second annular protrusion is engaged with the second annular groove. The cross section of the first annular protrusion perpendicular to the circumferential direction thereof may be rectangular or triangular.

In the two schemes, the matching of the annular protrusion and the groove is adopted, so that the plug body 200 can be clamped in the pressure relief hole 110, and the risk that the plug body 200 is separated from the first plate body 100 in the normal working process of the battery is reduced. Meanwhile, the matching structure of the protrusion and the groove can also enhance the sealing effect of the plug body 200.

The thickness of the plug body 200 and the thickness of the first plate body 100 in the direction perpendicular to the first plate body 100 may be determined as the case may be. In one embodiment, the wall of the plug body 200 facing away from the cavity is flush with the wall of the first plate body 100 facing away from the cavity, and the wall of the plug body 200 facing the cavity is flush with the wall of the first plate body 100 facing the cavity. In other words, the thickness of the plug body 200 is the same as that of the first plate 100, and two sides of the plug body 200 are flush with two sides of the first plate 100, so that on one hand, the space of the pressure relief hole 110 can be utilized as much as possible, and the risk that the plug body 200 is separated from the first plate 100 in the normal working process of the battery is reduced; on the other hand, the plug body 200 does not occupy the effective space of the battery, and the energy density of the battery is improved.

The housing assembly may include one cell 400 disposed therein, or may include a plurality of cells 400. When the cavity is used to provide a plurality of battery cells 400 arranged side by side, referring to fig. 1, the first plate 100 may be configured to be disposed on the same side of each battery cell 400, a boundary gap is formed between every two adjacent battery cells 400, and an orthographic projection of each boundary gap on a wall surface of the first plate 100 facing the battery cells 400 is a first projection. When the cavity is used for arranging a plurality of battery cells 400 arranged side by side, the number of the pressure relief holes 110 may also be multiple, and each first projection position is provided with at least one pressure relief hole 110. Meanwhile, the number of the plug bodies 200 is the same as that of the pressure relief holes 110, and each of the plug bodies 200 seals each of the pressure relief holes 110 in one-to-one correspondence. In other words, when the number of the battery cells 400 in the casing assembly is multiple, the interface gap formed between two adjacent battery cells 400 is provided with the pressure relief hole 110 at the corresponding position on the first plate 100. In the above embodiment, when the number of the battery cells 400 in the battery is multiple, the gas generated by the battery cells 400 can be rapidly discharged by providing one pressure relief hole 110 between every two battery cells 400, so that the risk of battery explosion is reduced.

In a further embodiment of the present application, the number of the pressure relief holes 110 is twice that of the first projections, and two ends of each first projection are respectively provided with one pressure relief hole 110. In other words, two pressure relief holes 110 are disposed at corresponding positions of the boundary gap formed between two adjacent battery cells 400 on the first board 100, and the two pressure relief holes 110 are correspondingly disposed at two end positions corresponding to the boundary gap. In the above embodiment, the two ends of the battery cell 400 are both provided with the pressure relief holes 110, so that gas generated at any position of the battery cell 400 can be quickly led out.

Of course, in another embodiment, the number of the pressure relief holes 110 may also be the same as the number of the first projections, and one pressure relief hole 110 is disposed at a position of the first board 100 corresponding to the middle area of each first projection.

In a further embodiment of the present application, the cavity is configured to dispose a plurality of battery cells 400 arranged side by side, and the first plate 100 is configured to be disposed on the same side of each battery cell 400. The housing assembly further includes a second plate 500, the second plate 500 is connected to one end of the first plate 100, and specifically, the second plate 500 is perpendicular to the first plate 100. The second plate 500 is disposed on the same side of each of the battery cells 400. In this embodiment, two tabs of each battery cell 400 are respectively disposed at two opposite ends of the battery cell 400, and the tab of each battery cell 400 is disposed at the same position. Specifically, the first plate body 100 is disposed at a side of each of the battery cells 400 where no tab is disposed, and the second plate body 500 is disposed at a side of each of the battery cells 400 where a tab is disposed.

Specifically, in this embodiment, a cavity is formed inside the second plate 500, a first air hole 510 is formed in a wall surface of the second plate 500 facing the cavity of the housing assembly, a second air hole 520 is formed in another wall surface of the second plate 500, and both the first air hole 510 and the second air hole 520 are communicated with the cavity. The air inside the housing assembly can enter the cavity inside the second plate 500 through the first air guide hole 510 and then be guided out through the second air guide hole 520. The second air guide holes 520 can communicate with the first air guide holes 510 when arranged at any suitable positions by providing cavities in the second plate body 500. That is, a flow path between the first air guide holes 510 and the second air guide holes 520 is not particularly designed. Further, a plurality of first air holes 510 may be provided in a wall surface of the second plate 500 facing the housing assembly, and a plurality of second air holes 520 may be provided in the other wall surface of the second plate 500. Therefore, multi-point and multi-direction gas is led out, the arrangement of flow channels can be reduced, and the processing cost is reduced.

The relative position of the first air guide holes 510 and the second air guide holes 520 may be determined according to actual requirements. In one embodiment, the hole axis of the first air guide hole 510 is perpendicular to the hole axis of the second air guide hole 520. Specifically, the wall surface where the first air-guide holes 510 are located is arranged perpendicular to the wall surface where the second air-guide holes 520 are located. In another embodiment, the hole axes of the first air holes 510 and the second air holes 520 are parallel and offset from each other. That is, the hole axis of the first air guide hole 510 is parallel to but not coincident with the hole axis of the second air guide hole 520. At this time, the wall surface of the first air-guide hole 510 is parallel to the wall surface of the second air-guide hole 520. In the above embodiments, the first air-guide holes 510 are not arranged opposite to the second air-guide holes 520, which effectively prevents the internal components of the battery module 10 from being exposed and also makes it difficult for external foreign substances to enter the inside of the battery.

In a further embodiment of the present application, the cells 400 are combined together to form a cell 400 group, the side of the cell 400 group facing the first plate 100 is provided with the interlayer 300, the thermal conductivity of the interlayer 300 is a, and a is greater than or equal to 0.1W/(m.k) and less than or equal to 4W/(m.k), for example, a may be 0.1W/(M.K), 2W/(M.K), 3W/(M.K), or 4W/(M.K). The separator 300 may be a coating or a curable filling paste, and is formed by coating a heat insulating material on the side of the battery cell 400 group facing the first plate body 100. Interlayer 300 may also be a separately formed plate body, and is bonded to battery core 400 group by being disposed between first plate body 100 and battery core 400 group, so as to realize the heat insulation effect between plate body 100 and battery core that burns hot when thermal runaway. The separator 300 is mainly used for heat insulation to prevent heat from being conducted to the inside of the battery when the external temperature is excessively high or heat is diffused in summer. In the related art, the thermal insulation effect of the separator layer is always the most desirable as possible. Through a large number of experiments, the inventors found that when the thermal conductivity of the interlayer 300 is less than 1W/(m.k), the interlayer 300 can perform a good thermal insulation function, and when the thermal conductivity of the interlayer 300 is between 1W/(m.k) and 4W/(m.k), the interlayer can perform a thermal insulation effect during thermal diffusion, and can perform a certain heat dissipation effect during normal operation of the battery.

The second aspect of the present application further provides a battery module 10, where the battery module 10 includes the housing assembly and the battery cell 400 in any of the above embodiments, and the battery cell 400 is disposed in the cavity of the housing assembly. In the battery module in this embodiment, pressure relief hole 110 in the housing assembly can lead out gas effectively when thermal runaway occurs in electric core 400 and a large amount of gas is generated, and safety performance is improved.

The third aspect of the present application also provides a battery pack including the battery module 10 described above.

In the above scheme, pressure release hole 110 on the casing assembly can lead out gas effectively when electric core 400 thermal runaway and a large amount of gas are produced, and the safety performance is improved.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A housing assembly for a battery module, the housing assembly defining a cavity for receiving an electrical core, the housing assembly comprising:

the first plate body is provided with a pressure relief hole communicated with the accommodating cavity, and a first clamping structure is formed on the peripheral wall of the pressure relief hole;

the plug body seals the pressure relief hole, a second clamping structure is formed on the peripheral wall of the plug body, the second clamping structure is in clamping fit with the first clamping structure, and when the pressure in the containing cavity is higher than a preset pressure, the plug body is separated from the first plate body.

2. The housing assembly of claim 1, wherein:

the first clamping structure comprises a first annular bulge arranged around the hole axis direction of the pressure relief hole, the second clamping structure comprises a first annular groove arranged around the hole axis direction of the pressure relief hole, and the first annular bulge is embedded with the first annular groove; or

3. The housing assembly of claim 1, wherein:

the wall surface of the plug body departing from the cavity is flush with the wall surface of the first plate body departing from the cavity; and/or the presence of a gas in the gas,

4. The housing assembly of claim 1, wherein:

the cavity is used for arranging a plurality of electric cores which are arranged side by side, the first plate body is arranged on the same side of each electric core, a boundary gap is formed between every two adjacent electric cores, and the orthographic projection of each boundary gap on the wall surface of the first plate body facing to the electric cores is a first projection;

5. The housing assembly of claim 4, wherein:

and two ends of each first projection are respectively provided with one pressure relief hole.

6. The housing assembly of claim 1, wherein:

7. The housing assembly of claim 6, wherein:

the hole axis of the first air guide hole is vertical to the hole axis of the second air guide hole; or

The hole axis of the first air guide hole is parallel to the hole axis of the second air guide hole and deviates from the hole axis of the second air guide hole.

8. The housing assembly of claim 1, wherein:

each electric core group is combined together to the electric core, one side of the electric core group facing to the first plate body is provided with an interlayer, the heat conductivity coefficient of the interlayer is a, and a is more than or equal to 0.1W/(m.K) and less than or equal to 4W/(m.K).

9. A battery module, comprising:

a cell and the housing assembly of any of claims 1-8, the cell disposed within a cavity of the housing assembly.

10. A battery pack comprising the battery module according to claim 9.