CN213340572U - Battery shell and single battery - Google Patents

Abstract

The utility model discloses a battery case and battery cell belongs to battery technical field. The battery shell comprises a shell body and a cover plate, wherein the shell body comprises a first side plate, a top plate and a bottom plate which are oppositely arranged, and the bottom plate, the first side plate and the top plate are sequentially connected to form a shell-shaped structure with three openings on three sides; the cover plate is of a U-shaped structure and is used for sealing three openings of the shell body; the cover plate comprises a second side plate, a third side plate and a fourth side plate which are sequentially connected, wherein the second side plate is opposite to the fourth side plate, and the third side plate is opposite to the first side plate; the cover plate is provided with an explosion-proof piece, and the explosion-proof piece is arranged on at least one of the second side plate and the fourth side plate. The utility model has the advantages of simple forming process and low manufacturing cost of the shell body of the battery shell; the U-shaped cover plate improves the applicability and assembly flexibility of the whole battery.

Description

Battery shell and single battery

Technical Field

The utility model relates to a battery technology field especially relates to a battery case and battery cell.

Background

At present, single batteries are mainly divided into aluminum-shell batteries, steel-shell batteries and soft-package batteries; the soft package battery is wrapped by the aluminum plastic film, so that the strength is low, and the bulge defect is easy to occur; the casing of the conventional aluminum-shell battery or steel-shell battery is generally composed of a casing body and a cover plate, the strength of the casing is guaranteed, but the casing body needs to be formed into a hexahedral structure (one surface of the casing body is open and needs to be sealed by the cover plate), the forming process is complex, and the cost is high; moreover, because the cover plate needs to be provided with functional elements such as a terminal, an explosion-proof element or a liquid injection hole, the arrangement mode, the arrangement position and the arrangement size of the functional elements are obviously limited by the conventional plate-shaped cover plate structure, and the applicability and the assembly flexibility of the whole battery are poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery case can reduce manufacturing cost, simplify manufacturing process, improves the suitability and the assembly flexibility of battery simultaneously.

An object of the utility model is also to provide a have battery cell of battery housing.

In order to realize the purpose, the following technical scheme is provided:

a battery shell comprises a shell body and a cover plate, wherein the shell body comprises a first side plate, a top plate and a bottom plate which are oppositely arranged, and the bottom plate, the first side plate and the top plate are sequentially connected, so that the shell body is of a shell-shaped structure with three openings;

the cover plate is of a U-shaped structure and is used for sealing the three-side opening of the shell body; the cover plate comprises a second side plate, a third side plate and a fourth side plate which are sequentially connected, wherein the second side plate is opposite to the fourth side plate, and the third side plate is opposite to the first side plate;

an explosion-proof piece is arranged on the cover plate and is arranged on at least one of the second side plate and the fourth side plate.

As a preferred embodiment of the battery case, a direction perpendicular to the top plate is a first direction, flanges extend from both ends of the cover plate along the first direction, and inner side surfaces of the flanges are respectively abutted against and welded to outer side surfaces of the top plate and the bottom plate.

As a preferred embodiment of the above battery case, the cover plate is provided with two terminals;

both of the terminals are located on the second side plate or the third side plate or the fourth side plate; or the like, or, alternatively,

and any two of the second side plate, the third side plate and the fourth side plate are provided with one terminal.

In a preferred embodiment of the battery case, the lid plate is provided with a liquid injection hole, and the liquid injection hole is provided in any one side plate of the lid plate.

As a preferred embodiment of the battery case, the cover plate is embedded in the case body and abuts against the inner wall of the case body; or

The cover plate is attached to the outer portion of the shell body.

A single battery comprises the battery shell and a core package arranged in the battery shell, wherein an insulating layer is arranged on the outer layer of the core package.

As a preferred embodiment of the single battery, the insulation layer is provided with a tab through hole, and a tab of the core package can penetrate through the tab through hole;

the insulating layer is also provided with a first through hole for exhausting the gas in the core bag.

In a preferred embodiment of the above unit cell, the first through-hole has a diameter of 0.1 to 1 mm.

As a preferred embodiment of the above single battery, the single battery further includes an insulating gasket, the insulating gasket is disposed between the cover plate and the core package, and includes a first insulating layer close to the cover plate and a second insulating layer far away from the cover plate, and the electrolyte flows into the battery case through the first insulating layer and the second insulating layer in sequence.

In a preferred embodiment of the above single battery, a second through hole is provided in the first insulating layer, a third through hole is provided in the second insulating layer, and the size of the second through hole is larger than the size of the third through hole.

In a preferred embodiment of the above single battery, the diameter of the second through hole is 3 to 5mm, and the diameter of the third through hole is 0.1 to 1 mm.

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

the shell body of the battery shell provided by the utility model forms a shell-shaped structure with three-side openings through the bottom plate, the first side plate and the top plate which are connected in sequence, compared with the traditional hexahedral structure, the shell body has simpler forming process and can be realized only by metal bending, and the manufacturing cost can be obviously reduced; the design of the U-shaped cover plate provides more choices for the arrangement mode, the arrangement position and the arrangement size of each functional part of the battery, and further improves the applicability and the assembly flexibility of the whole battery.

Drawings

Fig. 1 is a schematic structural diagram of a single battery in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another single battery in the embodiment of the present invention;

fig. 3 is an exploded view of a single battery according to an embodiment of the present invention;

FIG. 4 is an enlarged view taken at A in FIG. 3;

fig. 5 is a front view of a single battery in a first assembly mode according to an embodiment of the present invention;

fig. 6 is a rear view of a single battery in a first assembly mode according to an embodiment of the present invention;

fig. 7 is a top view of a single battery in a first assembly mode according to an embodiment of the present invention;

fig. 8 is a side view of a single battery in a first assembly of an embodiment of the present invention;

FIG. 9 is an enlarged view at B in FIG. 5;

FIG. 10 is an enlarged view at C of FIG. 8;

fig. 11 is a front view of a single battery in a second assembly mode according to an embodiment of the present invention;

fig. 12 is a rear view of a single battery in a second assembly mode according to an embodiment of the present invention;

fig. 13 is a top view of a single battery cell in a second assembly of the embodiment of the present invention;

fig. 14 is a side view of a single cell in a second assembly of an embodiment of the present invention;

FIG. 15 is an enlarged view taken at D in FIG. 12;

FIG. 16 is an enlarged view at E in FIG. 13;

fig. 17 is a schematic cross-sectional view of a battery case according to an embodiment of the present invention.

Reference numerals:

100-single battery;

10-a battery case; 20-core package; 30-an insulating layer; 40-an insulating spacer;

11-a housing body; 12-a cover plate; 13-a terminal; 14-liquid injection hole; 15-an explosion-proof piece; 31-tab through holes; 32-a first via; 41-third through hole;

111-top plate; 112-a backplane; 113-a first side panel; 121-a second side plate; 122-a third side panel; 123-a fourth side plate; 124-flanging.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 to 3, the present embodiment is directed to providing a battery case 10, including a case body 11 and a cover plate 12, wherein the case body 11 includes a top plate 111 and a bottom plate 112 oppositely disposed, and a first side plate 113 for connecting the bottom plate 112 and the top plate 111, and the bottom plate 112, the first side plate 113 and the top plate 111 are sequentially connected, so that the case body 11 forms a case structure with three-sided openings; the cover plate 12 is of a U-shaped structure and is used for closing three openings of the shell body 11; the cover plate 12 specifically includes a second side plate 121, a third side plate 122, and a fourth side plate 123 connected in sequence, where the second side plate 121 is opposite to the fourth side plate 123, and the third side plate 122 is opposite to the first side plate 113. The case body 11 of the battery case 10 provided in this embodiment forms a case structure with three open sides by the bottom plate 112, the first side plate 113, and the top plate 111, which are sequentially connected, and the case body 11 has a simpler molding process than a conventional hexahedral structure, and can be realized only by metal bending, so that the manufacturing cost can be significantly reduced.

Further, referring to fig. 17, the cover plate 12 may further be provided with a flange 124 to increase a welding area with the housing body 11, so as to reduce a welding difficulty. Specifically, the direction perpendicular to the top plate 111 is a first direction, the direction parallel to the top plate 111 is a second direction, in this embodiment, the first direction is the height direction of the whole battery housing 10, the second direction may be the length direction or the width direction of the whole battery housing 10, two ends of the cover plate 12 extend along the first direction to form flanges 124, and inner side surfaces of the flanges 124 abut against and are welded to outer side surfaces of the top plate 111 and the bottom plate 112, respectively. The installation and the welding degree of difficulty of apron 12 and casing body 11 have been reduced effectively in the setting of turn-ups 124, can make casing body 1 and the wall thickness of apron 12 accomplish enough thin, can also form laminated structure after turn-ups 124 and casing body 11 lateral wall butt simultaneously, even the thickness of apron 12 and casing body 11 is thinner can not have the risk of welding through yet.

The two ends of the second side plate 121, the third side plate 122 and the fourth side plate 123 of the cover plate 12 along the first direction are respectively provided with the flanges 124, the flanges 124 at the two ends of the second side plate 121 respectively abut against and are welded to the outer side walls of the top plate 111 and the bottom plate 112, the flanges 124 at the two ends of the third side plate 122 respectively abut against and are welded to the outer side walls of the top plate 111 and the bottom plate 112, the flanges 124 at the two ends of the fourth side plate 123 respectively abut against and are welded to the outer side walls of the top plate 111 and the bottom plate 112, and the second side plate 121, the third side plate 122 and the fourth side plate 123 respectively seal three-side openings of the housing body 11 after being welded.

Further, two terminals 13 are provided on the cover plate 12; one of the above-described terminals 13 is provided on any two of the second side plate 121, the third side plate 122, and the fourth side plate 123. In this embodiment, referring to fig. 3, the battery case 10 can be used to accommodate a core package 20 having bidirectional tabs, so that a terminal 13 is respectively disposed on the second side plate 121 and the fourth side plate 123 of the cover plate 12, which are respectively a positive terminal and a negative terminal, and the terminal 13 and the cover plate 12 form an integrated structure. During specific implementation, the core package 20 is placed into the shell body 11, the cover plate 12 is assembled with the shell body 11, and the tabs on the core package 20 are welded to the terminals 13 on the side plates at the two ends of the cover plate 12. Of course, in some other embodiments, the battery case 10 may also accommodate the core pack 20 with unidirectional tabs, that is, two tabs of the core pack 20 extend from the same end, and at this time, the two terminals 13 are both located on the same side plate of the cover plate 12, and specifically, may be located on the second side plate 121, the third side plate 122 or the fourth side plate 123, where the specific location is determined according to the structure of the core pack 20.

Generally, the battery case 10 is generally a flat rectangular parallelepiped structure, and the terminals 13 are generally located at both ends of the battery case 10 in the longitudinal direction, in order to facilitate assembly of the unit batteries 100 into a module. In the present embodiment, the first side plate 113 and the third side plate 122 extend in the length direction of the battery case 10, and the second side plate 121 and the fourth side plate 123 extend in the width direction of the battery case 10.

Further, referring to fig. 1 and 2, the cover plate 12 is further provided with a liquid injection hole 14 for performing a liquid injection operation after the cover plate 12 is assembled with the casing body 11, and the liquid injection hole 14 may be provided on any one side plate of the cover plate 12; preferably, the liquid injection hole 14 is formed in the third side plate 122 of the cover plate 12, i.e. on the side with the longer length dimension, so that the liquid injection efficiency can be improved, and the battery can be filled with the electrolyte as soon as possible; if locate annotate liquid hole 14 on second curb plate 121 or fourth curb plate 123 of apron 12, because the width direction size of apron 12 is less, the speed that diffuses to in the core package 20 after the electrolyte is poured into can show to reduce, has undoubtedly reduced and has annotated liquid efficiency, in order to further improve annotate liquid efficiency, preferably, can all set up one or more and annotate liquid hole 14 on second curb plate 121 of apron 12 and fourth curb plate 123, annotate liquid hole 14 through one of them curb plate that apron 12 is relative and connect the priming device, annotate liquid hole 14 of another curb plate and connect vacuum apparatus, can further improve and annotate liquid efficiency.

Further, with reference to fig. 1 and 2, the cover plate 12 is further provided with an explosion-proof member 15, which is mainly used to directly communicate with the outside when the air pressure inside the casing reaches a limit value, so as to realize rapid air release and prevent the battery from exploding. Alternatively, the vent 15 is a vent valve or vent score. In specific implementation, the explosion-proof member 15 can be disposed on any one side plate of the cover plate 12, that is, the design of the U-shaped cover plate 12 provides various choices for the disposition position of the explosion-proof member 15 of the battery, which is helpful to further improve the applicability and flexibility of the whole battery. Specifically, the explosion proof member 15 may be provided on at least one of the second and fourth side plates 121 and 123 of the cover plate 12. Specifically, in an embodiment, the explosion-proof member 15 may be disposed on the second side plate 121 or the fourth side plate 123 of the cover plate 12, the second side plate 121 or the fourth side plate 123 generally corresponds to the open end of the core pack 20, and after the gas in the core pack 20 escapes from the open end, the gas is discharged in time by the explosion-proof member 15, so as to achieve a good explosion-proof effect; secondly, the explosion-proof piece 15 is arranged on the cover plate 12, so that the occupied areas of the top plate 111 and the bottom plate 112 of the shell body 11 can be avoided, and the top plate 111 and the bottom plate 112 can be better attached and fixed with the core package 20. Further, the explosion-proof member 15 may be provided on the same side as or different from the liquid inlet 14; for example, referring to FIG. 2, the explosion-proof member 15 is provided on the third side plate 122 together with the pour hole 14, or, referring to FIG. 1, the explosion-proof member 15 is provided on the second side plate 121 or the fourth side plate 123 and the pour hole 14 is provided on the third side plate 122; the specific setting position can be adaptively changed according to the functional requirements and the different internal structures of the battery; of course, the explosion-proof member 15 and the terminal 13 may be disposed on the same side plate, which is beneficial to the electrical connection and fixing operation when the unit battery 100 is assembled.

The sizes of the corresponding terminal 13, the explosion-proof piece 15 and the liquid injection hole 14 can be changed adaptively according to the sizes of different side plates of the cover plate 12; in conclusion, in this embodiment, the structure of the U-shaped cover plate 12 provides more choices for the arrangement mode, the arrangement position and the arrangement size of each functional component of the battery, so that the applicability and the assembly flexibility of the whole battery are improved, and the safety of the battery is also improved.

The case body 11 and the cover plate 12 are assembled by welding to form the complete battery case 10. Specifically, there are two assembling methods between the housing body 11 and the cover plate 12: first, referring to fig. 5-10, the cover plate 12 is embedded inside the housing body 11 and abuts against the inner wall of the housing body 11, and a linear weld between the housing body 11 and the cover plate 12 is formed at the side of the housing body 11, not at the top or bottom; more specifically, assuming that length of housing body 11 is a1, width is b1, height is c1, wall thickness is h1, length of cover plate 12 is a2, width is b2, height is c2, and wall thickness is h2, in the first assembly mode, preferably, cover plate 12 and housing body 11 satisfy a 1-a 2, b1-b 2-h 1, and c1-c 2-2 h 1; after assembly, the outer surface of the cover plate 12 is kept flush with the outer surface of the housing body 11. Secondly, referring to fig. 11-16, the cover 12 is enclosed at the periphery of the housing body 11, that is, the cover 12 is not abutted against the inner wall of the housing body 11, but attached to the outside of the housing body 11, and at this time, a linear weld between the housing body 11 and the cover 12 is formed at the top or bottom of the housing body 11; more specifically, in the second assembly mode, preferably, the cover plate 12 and the housing body 11 satisfy a condition of a2-a1 ═ 2h2, b2-b1 ═ h2, and c2 ═ c 1. For the first assembly mode, the cover plate 12 is arranged inside the shell body 11 and can provide rigid support for the shell body 11, so that welding deformation is reduced, and the flatness of the battery shell 10 after welding is ensured; for the second assembly mode, the positions of the welding seams are transferred to the top surface and the bottom surface of the shell body 11 after matching, so that the welding operation is more facilitated, and the welding seams can be selected for use according to the assembly conditions and requirements during specific implementation.

With continued reference to fig. 3, the embodiment further provides a single battery 100, which includes a battery case 10 and a core package 20 disposed in the battery case 10, wherein an insulating layer 30 is disposed on an outer layer of the core package 20 for ensuring insulation between the core package 20 and the battery case 10. Further, referring to fig. 4, a tab through hole 31 is formed in a side wall of the insulating layer 30, and a tab can penetrate through the tab through hole 31 to be connected with the terminal 13; further, the insulating layer 30 is further provided with a first through hole 32, which is mainly used for timely discharging gas in the core package 20 to prevent battery explosion; optionally, the first through hole 32 is provided on the side wall of the insulating layer 30 opposite to the tab; alternatively, the diameter of the first through hole 32 is set to 0.1 to 1 mm. Specifically, as an embodiment, the insulation layer 30 may be an insulation film additionally coated on the outer layer of the core package 20, and the insulation film is independent from the core package 20 to perform a sufficient insulation function. As another embodiment, the insulating layer 30 may also be a diaphragm between the positive plate and the negative plate in the core package 20, and after the diaphragm is wound with the positive plate and the negative plate to form the core package 20, the diaphragm is not cut off, but is continuously wound around the whole core package 20 until the core package 20 is completely coated, that is, the insulating layer 30 is formed by the diaphragm and is integrated with the core package 20, so that the core package 20 can be attached to the insulating layer 30, and the forming process of the insulating layer 30 can be simplified, at this time, the tabs of the pole pieces can directly extend out from the two ends of the core package 20 perpendicular to the winding direction, and the gas in the core package 20 can be released from the ends. Further, in order to avoid the short circuit of the core package 20 caused by the contact between the end uncovered by the diaphragm and the shell, the insulating layer 30 is additionally arranged at the end uncovered by the diaphragm, and correspondingly, the insulating layer 30 is provided with a tab through hole 31 and a first through hole 32, so that the tab can conveniently penetrate out and the gas in the core package 20 can conveniently escape; the additional insulating layer 30 may be an additional coated insulating film; or the diaphragm is integrated with the core pack 20, that is, the diaphragm of the core pack 20 is longer at two ends in the direction perpendicular to the winding direction, and the longer part is used as the insulating layer 30 at the end of the tab, so that the tab can freely extend out while the insulation is realized, and the tab through hole 31 and the first through hole 32 are not needed to be arranged.

Further, still referring to fig. 3, the single battery 100 further includes an insulating gasket 40, which is arranged between the cover plate 12 and the core package 20, specifically, the insulating gasket 40 is a double-layer structure, and includes a first insulating layer close to the cover plate 12 and a second insulating layer far from the cover plate 12, the first insulating layer is provided with a second through hole, and the second insulating layer is provided with a third through hole 41; after the liquid is injected, the electrolyte firstly flows to the first insulating layer, enters between the two insulating layers and then flows into the battery shell 10 through the second insulating layer; by arranging the insulating gasket 40 between the cover plate 12 and the core package 20, the cover plate 12 and the core package 20 can be further effectively insulated and isolated, the battery shell 10 is prevented from being electrified, and the electrolyte can be uniformly and smoothly injected; further, electrolyte enters the core package 20 through the two insulating layers, so that the impact of the electrolyte on the core package 20 during liquid injection is effectively relieved, and the core package 20 is protected. Further, the size of the second through hole is larger than that of the third through hole 41, so that the electrolyte slowly flows into the core package 20, and the injection quality is improved; optionally, the diameter of the second through hole is 3-5mm, and the diameter of the third through hole 41 is 0.1-1 mm. Further optionally, the second through holes and the third through holes 41 are distributed in a staggered manner in the height direction, so that the uniformity of the injection process is further improved. Further optionally, in order to improve the injection efficiency, in this embodiment, the injection hole 14 is disposed on the third side plate 122 with a larger length on the cover plate 12, and the insulating gasket 40 is disposed between the third side plate 122 and the core pack 20, so that the length and the whole area thereof are ensured, and the electrolyte can enter through more through holes.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (11)

1. A battery shell comprises a shell body (11) and a cover plate (12), and is characterized in that the shell body (11) comprises a first side plate (113), a top plate (111) and a bottom plate (112) which are oppositely arranged, and the bottom plate (112), the first side plate (113) and the top plate (111) are sequentially connected, so that the shell body (11) forms a shell-shaped structure with three open sides;

the cover plate (12) is of a U-shaped structure and is used for sealing the three-side opening of the shell body (11); the cover plate (12) comprises a second side plate (121), a third side plate (122) and a fourth side plate (123) which are sequentially connected, wherein the second side plate (121) is opposite to the fourth side plate (123), and the third side plate (122) is opposite to the first side plate (113);

an explosion-proof piece (15) is arranged on the cover plate (12), and the explosion-proof piece (15) is arranged on at least one of the second side plate (121) and the fourth side plate (123).

2. The battery shell according to claim 1, wherein a direction perpendicular to the top plate (111) is a first direction, flanges (124) extend from both ends of the cover plate (12) along the first direction, and inner side surfaces of the flanges (124) are respectively abutted against and welded to outer side surfaces of the top plate (111) and the bottom plate (112).

3. The battery case according to claim 1, wherein two terminals (13) are provided on the cap plate (12);

-both of said terminals (13) are located on said second side plate (121) or on said third side plate (122) or on said fourth side plate (123); or the like, or, alternatively,

one of the terminals (13) is provided on any two of the second side plate (121), the third side plate (122), and the fourth side plate (123).

4. The battery case according to claim 1, wherein the lid plate (12) is provided with a liquid injection hole (14), and the liquid injection hole (14) is provided on either side plate of the lid plate (12).

5. The battery casing according to claim 1, wherein the cover plate (12) is embedded inside the casing body (11) and abuts against the inner wall of the casing body (11); or

The cover plate (12) is attached to the outside of the shell body (11).

6. A battery cell comprising a battery housing according to any one of claims 1 to 5, and further comprising a core package (20) disposed within the battery housing, wherein an insulating layer (30) is disposed on an outer layer of the core package (20).

7. The single battery according to claim 6, wherein the insulation layer (30) is provided with a tab through hole (31), and a tab of the core package (20) can penetrate through the tab through hole (31);

the insulating layer (30) is further provided with a first through hole (32) for exhausting gas in the core package (20).

8. The unit cell according to claim 7, wherein the diameter of the first through-hole (32) is set to 0.1-1 mm.

9. The battery cell according to claim 6, further comprising an insulating gasket (40), wherein the insulating gasket (40) is arranged between the cover plate (12) and the core package (20) and comprises a first insulating layer close to the cover plate (12) and a second insulating layer far from the cover plate (12), and electrolyte flows into the battery shell through the first insulating layer and the second insulating layer in sequence.

10. The unit cell according to claim 9, wherein a second through hole is provided on the first insulating layer, and a third through hole (41) is provided on the second insulating layer, and the size of the second through hole is larger than the size of the third through hole (41).

11. The battery cell according to claim 10, wherein the diameter of the second through hole is 3-5mm and the diameter of the third through hole (41) is 0.1-1 mm.

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