CN218274966U - Single battery - Google Patents

Abstract

The application relates to the technical field of energy storage devices, and discloses a single battery, which comprises a shell, a battery cell and an explosion-proof valve, wherein a first wall body of the shell is provided with a mounting hole; the explosion-proof valve is connected to the first wall body and covers the mounting hole; the boss that sets up on the first wall body will hold the chamber and cut apart holding district and the functional area that forms the intercommunication, and the electricity core is placed in hold in the district, be provided with the mounting hole corresponding to the part of functional area on the first wall body, this mounting hole of explosion-proof valve closing cap and connect with the casing to avoid explosion-proof valve towards passenger cabin, can prevent that the gas from directly dashing into passenger cabin after the valve opens. The mounting hole is opened in the part that corresponds to the functional area on the first wall body of casing, but accessible functional area and mounting hole exhaust gas from this, avoids electric core to seal the mounting hole, makes explosion-proof valve exhaust smoothly, can effectively avoid holding intracavity portion atmospheric pressure under the thermal runaway state too big and cause the destruction of top cap to improve battery cell's security and reliability.

Description

Single battery

Technical Field

The application relates to the technical field of energy storage devices, in particular to a single battery.

Background

At present, among new energy automobile's the power battery, on the explosion-proof valve located the top cap, the top cap is towards the passenger compartment, if the thermal runaway appears, inside a large amount of high temperature and the toxic gas of producing of battery, when inside atmospheric pressure reached and set for the threshold value, the explosion-proof valve will be opened, and high temperature and toxic gas will be directly towards the passenger compartment to threaten passenger safety. If the exhaust is not smooth, the high-temperature and high-pressure gas generated inside the battery can easily cause the damage of the top cover and the failure of the battery system, thereby affecting the safety performance of the whole vehicle.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a single battery, which can improve the safety and reliability of the single battery.

The single battery comprises a shell, a battery core and an explosion-proof valve, wherein the shell comprises a first wall body and a second wall body, the first wall body and the second wall body surround to form a containing cavity, and a mounting hole is formed in the first wall body; the explosion-proof valve is connected to the first wall body and covers the mounting hole; the battery cell is placed in the accommodating area, and the part of the first wall body corresponding to the functional area is provided with the mounting hole.

The single battery of the embodiment of the application has at least the following beneficial effects: the boss that sets up on the first wall body will hold the chamber and cut apart holding district and the functional area that forms the intercommunication, and the electricity core is placed in hold in the district, be provided with the mounting hole corresponding to the part of functional area on the first wall body, this mounting hole of explosion-proof valve closing cap is connected in the casing to avoid explosion-proof valve towards passenger cabin, can prevent that the gas from directly dashing into passenger cabin after the valve opens. The mounting hole is opened in the part that corresponds to the functional area on the first wall body of casing, but accessible functional area and mounting hole exhaust gas from this, avoids electric core to seal the mounting hole, makes explosion-proof valve exhaust smoothly, can effectively avoid holding intracavity portion atmospheric pressure under the thermal runaway state too big and cause the destruction of top cap to improve battery cell's security and reliability.

According to some embodiments of the application, be provided with a plurality of on the first wall body the boss, a plurality of the boss is spaced each other and around set up in around the mounting hole, and a plurality of interior region between the boss is the functional zone, and a plurality of exterior region between the boss is the containment zone, electric core supports in on the boss.

According to some embodiments of the application, the plurality of defined portions of the first wall project from the outside to the inside to form the boss.

According to some embodiments of the application, the boss is formed by inwardly protruding and thickening a plurality of set portions of the inner wall of the first wall.

According to some embodiments of the application, the boss is a separate part, the boss being connected to the inner wall of the first wall by welding, gluing or riveting.

According to some embodiments of the application, a side of the boss facing the battery cell is provided with a supporting surface, the battery cell abuts against the supporting surface, a sum of projection areas of the plurality of supporting surfaces on the first wall body is S1, an area of the first wall body is S2, and a ratio of S1 to S2 is 0.1 to 0.5.

According to some embodiments of the application, the first wall body includes the base portion and the boss, the boss is protruding outwards relative to the base portion, the inner wall of the boss is sunken outwards relative to the base portion to form the functional area, the battery cell is supported in the base portion, the mounting hole is opened on the boss, the explosion-proof valve is connected to the boss and covers the mounting hole.

According to some embodiments of the present application, a plane where the base portion is located is taken as a projection plane, a projection area of the boss on the projection plane is S3, and a sum of projection areas of the base portion and the boss on the projection plane is S4, where S3: S4 is in a range of 0.5 to 0.95.

According to some embodiments of the application, the first wall body has a set length L1 and a set width W1, the maximum dimension of the boss along the length direction of the first wall body is L2, and the maximum dimension of the boss along the width direction of the first wall body is W2, wherein L2: L1 is in a range of 0.5 to 0.95, and W2: W1 is in a range of 0.5 to 0.95.

According to some embodiments of the application, the first wall is located at a bottom of the housing and the second wall is located at a side of the housing.

Additional aspects and advantages of the present application 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 present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic diagram of a typical structure of a conventional single battery;

fig. 2 is a schematic structural diagram of a single battery according to an embodiment of the present application;

fig. 3 is a partially exploded view of the unit cell shown in fig. 2;

fig. 4 is a partial structural sectional view of the unit cell shown in fig. 2;

FIG. 5 is an enlarged view of a portion A of FIG. 4;

fig. 6 is an exploded view of a part of the structure of the housing of the unit cell and the explosion-proof valve according to an embodiment of the present disclosure;

FIG. 7 is an exploded view of the housing and the explosion-proof valve of another embodiment of the battery cell of the present application;

FIG. 8 is an exploded view of a portion of the housing shown in FIG. 7 and the explosion proof valve;

fig. 9 is a partial structural sectional view of a unit cell according to an embodiment of the present application;

FIG. 10 is an enlarged view of a portion of FIG. 9 at B;

fig. 11 is an exploded view of the housing and the explosion-proof valve of another embodiment of the battery cell of the present application;

FIG. 12 is an exploded view of a portion of the housing shown in FIG. 11 and the explosion proof valve;

fig. 13 is a partial structural sectional view of a unit cell according to another embodiment of the present application;

FIG. 14 is an enlarged view of a portion of FIG. 13 at C;

fig. 15 is an exploded view of the housing and the explosion-proof valve of another embodiment of the battery cell of the present application;

fig. 16 is a partially exploded view of a unit cell according to another embodiment of the present application.

Reference numerals are as follows:

the structure comprises a shell 100, a containing area 101, a functional area 102, a first wall body 103, a second wall body 104, a boss 105, a mounting hole 106, a supporting surface 107, a base part 108 and an opening 109;

the explosion-proof valve 200, the battery cell 300, the top cover 400, the pole 401 and the liquid injection port 402.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, 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 functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, several means are one or more, and the above, below, within and the like are understood to include the present numbers. The description to first, second, etc. is only for the purpose of distinguishing technical features, and should not be interpreted as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Fig. 1 is a typical structure schematic diagram of present conventional battery cell, refer to fig. 1, at present, in new energy automobile's power battery, battery cell includes casing 1, top cap 2 and encapsulates in top cap 2 and the inside electric core of casing 1, during the assembly, top cap 2 generally faces the passenger cabin, be provided with explosion-proof valve 3 on the top cap 2, if thermal runaway appears, the inside a large amount of high temperature and toxic gas that can produce of battery, when inside atmospheric pressure reaches the settlement threshold value, explosion-proof valve 3 will be opened, at this moment, high temperature and toxic gas will directly rush to the passenger cabin, thereby threaten passenger's safety. And, be subject to the requirement of battery system lightweight and low cost, the intensity, temperature resistance and fire behaviour of top cap 2 receive the restriction, under the thermal runaway's the condition, if the exhaust is not smooth and easy, the high temperature high-pressure gas of inside production very easily causes the destruction of top cap 2, causes the trouble of battery system to influence the security performance of whole car.

The embodiment of the application provides a single battery, can effectively avoid gaseous direct impact passenger compartment to can ensure that it is smooth and easy to exhaust, thereby improve fail safe nature.

The embodiment of the first aspect of the present application provides a single battery, referring to fig. 2 to 6, the single battery includes a housing 100, a battery cell 300, and an explosion-proof valve 200, the housing 100 includes a plurality of wall bodies, the plurality of wall bodies surround to form a containing cavity, the containing cavity can contain the battery cell 300, and the plurality of wall bodies include a first wall body 103 and a second wall body 104, wherein a mounting hole 106 is provided on the first wall body 103, and the explosion-proof valve 200 is connected to the first wall body 103 and covers the mounting hole 106. The first wall body 103 is provided with at least one boss 105, the accommodating cavity is divided by the at least one boss 105 to form an accommodating area 101 and a functional area 102 which are communicated, the battery cell 300 is placed in the accommodating area 101, and a mounting hole 106 is formed in the first wall body 103 corresponding to the functional area 102, so that the explosion-proof valve 200 can be connected to the first side wall of the casing 100, the explosion-proof valve 200 is prevented from facing a passenger cabin, and gas can be prevented from directly flowing into the passenger cabin after the valve is opened. The battery cell 300 is accommodated in the accommodating area 101, the functional area 102 formed by the boss 105 is located on one side of the battery cell 300, the mounting hole 106 is formed in a portion, corresponding to the functional area 102, of the first wall body 103 of the casing 100, and the mounting hole 106 is prevented from being sealed by the battery cell 300, so that gas generated by the battery cell 300 can be discharged through the functional area 102 and the mounting hole 106, the explosion-proof valve 200 is enabled to exhaust smoothly, and the damage to the top cover 400 caused by the overlarge air pressure inside the accommodating cavity under the thermal runaway state can be effectively avoided, so that the safety and the reliability of the single battery are improved. The single battery provided by the embodiment of the application is applied to the power battery system of the new energy automobile, and the safety and the reliability of the whole automobile can be effectively improved.

In the above embodiment, the first wall 103 may be located at the bottom or the side of the housing 100, so that the explosion-proof valve 200 may be installed at the bottom or the side of the housing 100 by the above arrangement, and thus, the gas inside the housing 100 may be exhausted from the housing 100 through the bottom or the side of the housing 100, and the gas may be prevented from directly rushing to the passenger compartment after the explosion-proof valve 200 is opened.

In the housing assembly according to the embodiment of the present application, a plurality of bosses 105 may be disposed on the housing 100, or only one boss 105 may be disposed on the housing 100, and fig. 4 to 15 illustrate some embodiments of the housing by exemplifying the first wall 103 being located at the bottom of the housing 100, where fig. 4 to 10 illustrate an embodiment in which a plurality of bosses 105 are disposed on the first wall 103, and fig. 11 to 15 illustrate an embodiment in which one boss 105 is disposed on the first wall 103.

Referring to fig. 4 to 10, in order to illustrate the internal structure of the casing 100, the casing 100 in fig. 6 and 8 is partially cut away to show the internal structure, in some embodiments of the single battery, a plurality of bosses 105 are disposed on the first wall 103 of the casing 100, the plurality of bosses 105 are spaced apart from each other and disposed around the mounting hole 106, an internal region between the plurality of bosses 105 is the functional region 102, an external region between the plurality of bosses 105 is the receiving region 101, the battery cell 300 is supported on the bosses 105, so as to prevent the battery cell 300 from blocking the mounting hole 106, and thus the functional region 102 and the mounting hole 106 form an exhaust passage communicated with the receiving region 101, and smooth exhaust of gas inside the casing 100 can be ensured. And, a plurality of bosses 105 protrude from the inside of the casing 100 to support the battery cells 300, while the external structure and size of the casing 100 are not changed, which does not affect the assembly of the single battery.

The boss 105 may be formed on the first wall 103 through an integral molding process, and a support member for supporting the battery cell 300 is not required to be additionally provided, so that the number of parts can be reduced and the assembly process can be saved, for example: referring to fig. 4 to 6, a plurality of bosses 105 are formed by inwardly protruding and thickening a plurality of predetermined portions of the inner wall of the first wall 103, and are formed on the first wall 103 by a stamping process or a cutting process, the predetermined portions are a plurality of portions of the inner wall of the first wall 103 surrounding the installation hole 106, and the bosses 105 are formed by thickening, so that the strength of the bosses 105 and the strength of the first wall 103 can be improved. Alternatively, referring to fig. 7 and 8, the bosses 105 are formed by protruding a plurality of predetermined portions of the first wall 103 from the outside to the inside, and the bosses 105 protruding toward the inside of the casing 100 are formed by pressing the first wall 103 from the outside to the inside through a pressing process, so that the material consumption and weight of the first wall 103 can be reduced, the cost can be reduced, and the energy density of the single battery can be prevented from being affected.

Alternatively, referring to fig. 9 and 10, the bosses 105 may be connected to the first wall 103 as separate parts, so that the plurality of bosses 105 surround the mounting holes 106 and are connected to the inner wall of the first wall 103, thereby supporting the battery cell 300, and the bosses 105 may be connected to the inner wall of the first wall 103 by conventional connection methods such as welding, riveting, and bonding after being separately processed, without changing the structure of the first wall 103, thereby reducing the processing difficulty of the bosses 105 and the first wall 103.

In some embodiments, a side of the boss 105 facing the battery cell 300 is provided with a supporting surface 107, the battery cell 300 abuts against the supporting surface 107, a sum of projection areas of the plurality of supporting surfaces 107 on the first wall body 103 is S1, and an area of the first wall body 103 is S2, where a ratio of S1 to S2 is 0.1 to 0.5, and in this ratio range, it can be ensured that the size of the boss 105 is sufficient to stably support the battery cell 300, and meanwhile, the functional region 102 formed between the bosses 105 has a sufficiently large volume space, so as to ensure smooth exhaust, and facilitate the installation of the mounting hole 106, and in addition, it can also be avoided that the boss 105 occupies too much volume space inside the casing 100. Specifically, the ratio of S1 to S2 may be selected to be 0.1, 0.2, 0.3, 0.4, 0.5 or any other ratio between 0.1 and 0.5. It can be understood that, in the plurality of bosses 105, the size of each boss 105 may be the same or different, and thus, the projected areas of the supporting surfaces 107 on the first wall 103 may be equal or different, and in particular, the supporting surfaces may be configured reasonably according to the structure of the single battery and the assembly requirement.

The height of the protrusion of the boss 105 towards one side of the battery cell 300 can be reasonably configured according to actual assembly requirements and exhaust conditions, and the support surface 107 can support the battery cell 300 at a position having a set distance from the mounting hole 106, so that the position of the mounting hole 106 is avoided, and the mounting hole 106 is prevented from being sealed. In the embodiment of the present application, referring to fig. 4 and 5, a range of a height d1 of the boss 105 protruding toward one side of the battery cell 300 is 0.1mm to 10mm, for example, d1 may be 0.1mm, 1mm, 5mm, 10mm or any other value between 0.1mm and 10mm, in this size range, it can be ensured that the functional region 102 formed between the bosses 105 exhausts smoothly, and meanwhile, for a commonly used single battery, the size has a small influence on the volume inside the casing 100, and the boss 105 can be prevented from occupying too much volume space inside the casing 100.

Referring to fig. 11 to 15, in other embodiments, the first wall 103 includes a base portion 108 and a boss 105, the boss 105 protrudes outward relative to the base portion 108, an inner wall of the boss 105 is recessed outward relative to the base portion 108 to form the functional region 102, the battery cell 300 is supported by the base portion 108, the mounting hole 106 is opened on the boss 105, and the explosion-proof valve 200 is connected to the boss 105 and covers the mounting hole 106. To facilitate illustration of the internal structure of the housing 100, fig. 14 shows the internal structure partially cut away, wherein the boss 105 can be stamped and formed from a set position of the first wall 103 using a conventional stamping process. Thus, the battery cell 300 placed in the housing area 101 is supported by the base portion 108 and is suspended on the side of the functional area 102 facing the battery cell 300, so that the functional area 102 can serve as an exhaust passage, and the mounting hole 106 is opened in the boss 105 to communicate with the functional area 102, thereby smoothly releasing pressure and exhausting air. The support member for supporting the battery cell 300 does not need to be additionally provided in the casing 100, so that the structure can be simplified and the occupation of the internal volume of the casing 100 can be reduced.

Referring to fig. 11 to 15, in the above embodiment, the shape of the protrusion is not limited, for example, the protrusion may have a rectangular structure as shown in fig. 11 and 12; alternatively, the projections may have a crisscross shape as shown in fig. 15, resembling a cross; alternatively, the protrusions may take other regular shapes, such as diamonds, circles, ovals (not shown), or other irregular shapes; the specific shape of the boss 105 may be configured according to the exhaust requirement or according to the assembly requirement of the battery cell 300 and other structural members to be supported.

The size of the boss 105 on the first wall 103 can be configured reasonably according to the structure of the single battery and the assembly requirement, in some embodiments, the plane where the base portion 108 is located is taken as a projection plane, the projection area of the boss 105 on the projection plane is S3, and the sum of the projection areas of the base portion 108 and the boss 105 on the projection plane is S4, where S3: S4 ranges from 0.5 to 0.95. Specifically, the ratio of S3 to S4 may be selected to be 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, or any other ratio between 0.5 and 0.95. In this size range, the base portion 108 can be ensured to stably support the battery cell 300, and the outwardly recessed boss 105 can form the functional region 102 covering the mounting hole 106, so that the mounting hole 106 can be conveniently arranged, and smooth exhaust is ensured.

Referring to fig. 11, in some embodiments, the first wall 103 has a set length L1 and a set width W1, the maximum dimension of the boss 105 in the length direction of the first wall 103 is L2, and the maximum dimension of the boss 105 in the width direction of the first wall 103 is W2, where L2: L1 ranges from 0.5 to 0.95, W2: w1 ranges from 0.5 to 0.95. In this size range, the base body portion 108 can be ensured to stably support the electrical core 300, the boss 105 can facilitate the setting of the mounting hole 106, the boss 105 forms the functional region 102 covering the mounting hole 106, the setting of the mounting hole 106 can be facilitated, and smooth exhaust is ensured.

The distance between the base portion 108 of the first wall 103 and the inner wall of the boss 105 can be configured according to actual assembly requirements and exhaust conditions, and the base portion 108 can support the battery cell 300 at a position having a set distance from the mounting hole 106, so as to leave the mounting hole 106. In the embodiment of the present application, referring to fig. 14 and 15, a distance d2 between the base portion 108 and the inner wall of the boss 105 ranges from 0.1mm to 10mm, for example, d may be 0.1mm, 1mm, 5mm, 10mm or any other value between 0.1mm and 10mm, within this size range, it can be ensured that the functional region 102 formed by the boss 105 exhausts smoothly, and meanwhile, for a commonly used single battery, the size has a small influence on the external structure and the overall volume of the housing 100, and when the single battery is used for assembling in groups or assembling in boxes, the influence on the assembling can be reduced.

It can be understood that, in the single battery in the embodiment of the present application, the boss 105 in the foregoing various embodiments may support the battery cell 300, and may also be used to support other components inside the casing 100, in the embodiment of the present application, the support function of the boss 105 on the battery cell 300 is taken as an example, and the support function of the boss 105 on other components, which is the same as the support function on the battery cell 300, can also effectively avoid sealing the installation hole 106, and is helpful for smooth exhaust and pressure relief, and improve the safety and reliability of the single battery.

Referring to fig. 2 to 16, in the single battery according to the embodiment of the present application, a wall is disposed on each of a bottom and a side wall of the casing 100, the top cover 400 on a side of the casing 100 opposite to the bottom has an opening 109, and the battery cell 300 can enter the receiving cavity through the opening 109. The top cover 400 is attached to the case 100 at the opening 109 and covers the opening 109, thereby achieving encapsulation of the battery cell 300. It is understood that conventional components such as the pole assembly 401, the injection port 402 assembly, and the like are further provided on the top cover 400, and the electrolyte can be injected into the accommodating chamber through the injection port 402.

Referring to fig. 2 to 15, in some embodiments, the first wall 103 may be located at the bottom of the casing 100, and the second wall 104 may be located at the side of the casing 100, so that the explosion-proof valve 200 is located at the bottom of the casing 100, and after the single battery is assembled in an automobile, internal gas can be exhausted from the bottom of the battery under a thermal runaway condition, and thus, the direct impact on a passenger compartment can be avoided. In addition, the functional area 102 formed by the boss 105 on the first wall body 103 forms an exhaust passage for communicating the battery core 300 with the mounting hole 106, so that the explosion-proof valve 200 can smoothly exhaust and release air, thereby preventing the top cover 400 from being damaged due to excessive air pressure, improving the safety and reliability of the battery, and being beneficial to improving the safety performance of the whole vehicle.

Referring to fig. 16, in some embodiments, the first wall 103 may be located on either side of the housing 100, so that the explosion-proof valve 200 is located on the side of the housing 100, the second wall 104 is located on the bottom of the housing 100, and after the single battery is assembled in an automobile, internal gas can be discharged from the side of the battery under thermal runaway, and thus, the battery is prevented from directly impacting a passenger compartment. In addition, the functional area 102 formed by the boss 105 on the first wall body 103 forms an exhaust passage for communicating the battery cell 300 and the mounting hole 106, so that the explosion-proof valve 200 can smoothly exhaust and release air, thereby avoiding the damage of the top cover 400 caused by excessive air pressure, improving the safety and reliability of the battery, and being beneficial to improving the safety performance of the whole vehicle.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims (10)

1. A battery cell, comprising:

the shell comprises a first wall body and a second wall body, the first wall body and the second wall body surround to form a containing cavity, and a mounting hole is formed in the first wall body;

an electric core;

the explosion-proof valve is connected to the first wall body and covers the mounting hole;

the battery cell is placed in the accommodating area, and the part of the first wall body corresponding to the functional area is provided with the mounting hole.

2. The battery cell according to claim 1, wherein the first wall is provided with a plurality of bosses, the plurality of bosses are spaced apart from each other and are disposed around the mounting hole, an inner region between the plurality of bosses is the functional region, an outer region between the plurality of bosses is the receiving region, and the cell is supported on the bosses.

3. The single battery cell as claimed in claim 2, wherein the plurality of predetermined portions of the first wall body protrude from the outside to the inside to form the protruding portion.

4. The single-cell battery of claim 2, wherein a plurality of predetermined portions of the inner wall of the first wall are inwardly thickened to form the bosses.

5. The cell defined in claim 2, wherein the boss is a separate part and is connected to the inner wall of the first wall by welding, bonding or riveting.

6. The single battery according to claim 2, wherein a side of the boss facing the battery cell is provided with a supporting surface, the battery cell abuts against the supporting surface, a sum of projected areas of the plurality of supporting surfaces on the first wall body is S1, an area of the first wall body is S2, and a ratio of S1: S2 is 0.1 to 0.5.

7. The battery cell as claimed in claim 1, wherein the first wall includes a base portion and the boss, the boss protrudes outward relative to the base portion, an inner wall of the boss is recessed outward relative to the base portion to form the functional region, the battery cell is supported by the base portion, the mounting hole is opened in the boss, and the explosion-proof valve is connected to the boss and covers the mounting hole.

8. The cell according to claim 7, wherein a plane on which the base portion is located is a projection plane, a projection area of the projection on the projection plane is S3, a sum of the projection areas of the base portion and the projection on the projection plane is S4, and a range of S3: S4 is 0.5 to 0.95.

9. The single battery according to claim 7, wherein the first wall body has a set length L1 and a set width W1, the maximum dimension of the boss in the length direction of the first wall body is L2, the maximum dimension of the boss in the width direction of the first wall body is W2, wherein L2: L1 is in the range of 0.5 to 0.95, W2: w1 ranges from 0.5 to 0.95.

10. The cell defined in any one of claims 1 to 9, wherein the first wall is located at a bottom of the housing and the second wall is located at a side of the housing.

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