Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a battery pack, the battery comprises a shell, a roll core and an anti-explosion valve; in the first direction, the roll cores are provided with arc-shaped end faces, the roll cores are located in the shell, the number of the roll cores is multiple, the multiple roll cores are arranged in the second direction, and the arc-shaped end faces of the multiple roll cores are arranged in the second direction; wherein an exhaust channel is formed between a plurality of arc-shaped end faces arranged in the second direction and the inner wall face of the end, close to the arc-shaped end faces, of the shell in the first direction, the anti-explosion valve is connected to the end, close to the arc-shaped end faces, of the shell in the first direction, and the face, facing the roll core, of the anti-explosion valve forms at least part of the inner wall face of the exhaust channel. In practical application, a large amount of gas generated by the battery under an abnormal condition breaks through the anti-explosion valve at the exhaust passage and is exhausted out of the battery, and the anti-explosion valve forms a part of the inner wall surface of the exhaust passage, so that the triggering of the anti-explosion valve is not blocked in the pressure relief process of the battery, and the pressure relief effect of the battery is good.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery and battery pack. Background Technology

[0002] During battery charging and discharging, especially under abnormal conditions such as overcharging or internal short circuits, violent electrochemical reactions occur inside the battery, generating a large amount of heat. This heat causes the electrolyte and electrode materials inside the battery to decompose, producing a large amount of gas and causing a sharp increase in the internal pressure of the battery. The explosion-proof valve can automatically open when the pressure reaches a preset value, releasing the high-pressure gas inside the battery in a timely manner, preventing the battery from exploding or rupturing due to excessive internal pressure, and effectively protecting the battery casing and the safety of surrounding equipment. Currently, in conventional batteries, the explosion-proof valve is located in the middle of the battery and is tightly attached to the core, which obstructs the battery pressure relief process and results in poor pressure relief effect. Utility Model Content

[0003] The primary objective of this application is to propose a battery with good pressure relief performance.

[0004] To achieve the above objectives, this application provides a battery having intersecting first and second directions, the battery comprising a casing, a winding core, and an explosion-proof valve;

[0005] Along the first direction, the core has an arc-shaped end face, and the core is located inside the housing;

[0006] Wherein, an exhaust channel is formed between the arc-shaped end face and the inner wall surface of the housing at the end near the arc-shaped end face in the first direction, the explosion-proof valve is connected to the end of the housing near the arc-shaped end face in the first direction, and the side of the explosion-proof valve facing the core constitutes at least a portion of the inner wall surface of the exhaust channel.

[0007] In a particular embodiment of this application, the battery further has a third direction, wherein the first direction, the second direction, and the third direction intersect each other;

[0008] The housing includes a housing body and a top cover assembly, the housing body and the top cover assembly are connected along the third direction, the housing body includes a first sidewall, the first sidewall and the top cover assembly are disposed opposite to each other along the third direction, the core is located inside the housing body, and the explosion-proof valve is connected to the first sidewall.

[0009] In a specific embodiment of this application, the first sidewall has a through-hole for mounting along the third direction, and the explosion-proof valve covers the through-hole for mounting;

[0010] The battery also includes a reinforcing member, which has a vent hole extending through the third direction, and the reinforcing member is connected to the wall surface of the mounting through hole;

[0011] The explosion-proof valve and the reinforcing member are arranged along the third direction.

[0012] In a specific embodiment of this application, the mounting through hole includes a first hole portion and a second hole portion communicating along a third direction, wherein the diameter of the first hole portion is larger than the diameter of the second hole portion;

[0013] The reinforcing member includes a first ring body and a second ring body, which are connected along the third direction. The outer diameter of the first ring body is larger than the outer diameter of the second ring body, and the inner holes of the first ring body and the second ring body are interconnected to form the exhaust hole.

[0014] The outer peripheral surface of the first ring body is connected to the hole wall of the first hole, and the outer peripheral surface of the second ring body is connected to the hole wall of the second hole.

[0015] In one particular embodiment of this application, the first hole is located on the side of the second hole closer to the winding core;

[0016] or,

[0017] The first hole is located on the side of the second hole away from the winding core.

[0018] In one specific embodiment of this application, the explosion-proof valve is connected to the wall surface of the second hole, and the explosion-proof valve is in contact with the second ring body.

[0019] In a specific embodiment of this application, the explosion-proof valve includes a valve body and explosion-proof grooves. The valve body is sheet-shaped and is connected to the housing body and covers the mounting through hole. The explosion-proof grooves are provided on the third-party side of the valve body.

[0020] in,

[0021] The explosion-proof groove is arc-shaped, and there are multiple explosion-proof grooves arranged around the center of the valve body, with the arc-shaped opening of the explosion-proof groove facing away from the center of the valve body;

[0022] or,

[0023] The explosion-proof markings are circular and are arranged around the center of the valve body.

[0024] or,

[0025] The explosion-proof markings are straight lines, and there are multiple explosion-proof markings that intersect each other.

[0026] In a specific embodiment of this application, the mounting through hole is elliptical, and the major axis of the mounting through hole extends along the second direction;

[0027] or,

[0028] The mounting through hole is arc-shaped, and the chord segment of the mounting through hole extends along the second direction. In the first direction, the chord segment of the mounting through hole is located on the side of the arc segment away from the center of the first sidewall.

[0029] or,

[0030] The mounting through hole is trapezoidal, and the lower bottom of the mounting through hole extends along the second direction. In the first direction, the lower bottom of the mounting through hole is located on the side of the upper bottom away from the center of the first sidewall.

[0031] In a specific embodiment of this application, in the first direction, both ends of the winding core have the arc-shaped end face, and both ends of the first sidewall are provided with the explosion-proof valve.

[0032] This application also proposes a battery pack, including a housing and a battery as described above, the battery being connected to the housing.

[0033] The present application discloses a battery and battery pack, which, compared with the prior art, have the following advantages:

[0034] In the battery of this application, an exhaust channel is formed between the arc-shaped end faces of multiple cores and the inner wall surface of the casing near the arc-shaped end faces. Moreover, the side of the explosion-proof valve facing the cores constitutes at least part of the inner wall surface of the exhaust channel. In practical applications, a large amount of gas generated by the battery under abnormal conditions will break through the explosion-proof valve at the exhaust channel and be discharged outside the battery. Since the explosion-proof valve constitutes part of the inner wall surface of the exhaust channel, the triggering of the explosion-proof valve will not be obstructed during the battery depressurization process, and the battery depressurization effect is good. Attached Figure Description

[0035] Figure 1 This is a perspective view of the battery according to an embodiment of this application;

[0036] Figure 2 This is a perspective view of the battery from another angle according to an embodiment of this application;

[0037] Figure 3 This is an exploded schematic diagram of the battery according to an embodiment of this application;

[0038] Figure 4 This is a bottom view of the battery in this embodiment of the application without the explosion-proof valve;

[0039] Figure 5 This is a cross-sectional view of the first sidewall, the reinforcing member, and the explosion-proof valve in an embodiment of this application;

[0040] Figure 6 This is a cross-sectional view of the first sidewall, the reinforcing member, and the explosion-proof valve in other embodiments of this application;

[0041] Figure 7 This is a structural diagram of the explosion-proof valve according to an embodiment of this application;

[0042] Figure 8 This is a structural diagram of an explosion-proof valve according to other embodiments of this application;

[0043] Figure 9 This is a structural diagram of an explosion-proof valve according to other embodiments of this application;

[0044] Figure 10 This is a bottom view of the battery without the explosion-proof valve in other embodiments of this application;

[0045] Figure 11 This is a bottom view of the battery without the explosion-proof valve in other embodiments of this application;

[0046] Figure 12 This is a bottom view of a battery according to another embodiment of this application.

[0047] In the diagram, X represents the first direction; Y represents the second direction; Z represents the third direction; 100 represents the exhaust channel; 1 represents the shell; 11 represents the shell body; 111 represents the first sidewall; 112 represents the second sidewall; 113 represents the third sidewall; 1101 represents the mounting through hole; 1101A represents the first hole; 1101B represents the second hole; 12 represents the top cover assembly; 2 represents the core; 201 represents the arc-shaped end face; 3 represents the explosion-proof valve; 31 represents the valve body; 32 represents the explosion-proof notch; 4 represents the reinforcing member; 401 represents the exhaust port; 41 represents the first ring body; 42 represents the second ring body. Detailed Implementation

[0048] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0049] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0053] This application proposes a battery pack, including a housing and a battery as described below. The battery pack can store a large amount of electrical energy through the battery and can provide power for electric vehicles, electric motorcycles, power tools and other equipment. Since the battery pack uses the battery described below, the battery pack also has the advantages of the battery described below, which will not be elaborated further in this application.

[0054] like Figures 1 to 4 As shown, a battery according to a preferred embodiment of this application has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. The battery includes a housing 1, a core 2, and an explosion-proof valve 3. Along the first direction X, the core 2 has an arc-shaped end face 201 and is located inside the housing 1. An exhaust channel 100 is formed between the arc-shaped end face 201 and the inner wall surface of the housing 1 near the arc-shaped end face 201 in the first direction X. The explosion-proof valve 3 is connected to the end of the housing 1 near the arc-shaped end face 201 in the first direction X, and the side of the explosion-proof valve 3 facing the core 2 constitutes at least a portion of the inner wall surface of the exhaust channel 100.

[0055] Specifically, an exhaust channel 100 is formed between the arc-shaped end face 201 of the core and the inner wall surface of the housing 1 near the arc-shaped end face 201. The side of the explosion-proof valve 3 facing the core 2 constitutes at least part of the inner wall surface of the exhaust channel 100. In practical applications, a large amount of gas generated by the battery under abnormal conditions will break through the explosion-proof valve 3 at the exhaust channel 100 and be discharged outside the battery. Since the explosion-proof valve 3 constitutes part of the inner wall surface of the exhaust channel 100, the triggering of the explosion-proof valve 3 will not be obstructed during the battery depressurization process, and the battery depressurization effect is good.

[0056] It should be noted that the arc-shaped end face 201 of the core is referred to as the first inner wall surface, and the inner wall surface of the shell 1 near the arc-shaped end face 201 is referred to as the second inner wall surface. Since the first inner wall surface and the second inner wall surface form an exhaust channel 100, the first inner wall surface and the second inner wall surface also constitute the inner wall surface of the exhaust channel 100. That is to say, the exhaust channel 100 is formed by the first inner wall surface, the second inner wall surface and at least a portion of the side of the explosion-proof valve 3 facing the core 2.

[0057] like Figure 3 and Figure 4 As shown, there are multiple cores 2, which are arranged along the second direction Y, and the arc-shaped end faces 201 of the multiple cores 2 are arranged along the second direction Y; multiple exhaust channels 100 are formed between the multiple arc-shaped end faces 201 arranged along the second direction Y and the inner wall surface of the shell 1 near the arc-shaped end face 201.

[0058] like Figure 3As shown, the housing 1 includes a housing body 11 and a top cover assembly 12, which are connected along a third direction Z. The housing body 11 includes a first sidewall 111, which is opposite to the top cover assembly 12 along the third direction Z. The core 2 is located inside the housing body 11, and the explosion-proof valve 3 is connected to the first sidewall 111. Specifically, the top cover assembly 12 includes a cover plate, a pole, and a connecting piece, etc. The pole and the connecting piece form an electrical component for conducting current. The pole passes through the cover plate, and the connecting piece connects the pole and the core 2. A current transmission line is formed on the side where the top cover assembly 12 is located. The advantage of connecting the explosion-proof valve 3 to the first side wall 111 is that the battery pressure relief area is separated from the current conduction area, preventing the pressure relief material from contacting the electrical connection parts, reducing secondary hazards caused by problems such as electric arc, short circuit, and insulation failure. Moreover, in practical applications, the battery is assembled inside the battery pack, and the first side wall 111 is the bottom wall of the battery. Therefore, the gas and ejected material generated during battery thermal runaway will be discharged downwards, away from adjacent batteries or electrical units, greatly reducing the possibility of thermal runaway spreading within the battery pack and improving the safety of the entire battery pack.

[0059] like Figure 3 As shown, the shell body 11 also includes two second sidewalls 112 and two third sidewalls 113; the two second sidewalls 112 are arranged opposite each other along the second direction Y, and the two third sidewalls 113 are respectively connected to the two ends of the second sidewalls 112 in the first direction X, and the top cover assembly 12 and the first sidewall 111 are respectively connected to the two ends of the second sidewalls 112 in the third direction Z; the two third sidewalls 113 are arranged opposite each other along the first direction X, and the two second sidewalls 112 are respectively connected to the two ends of the third sidewalls 113 in the second direction Y, and the top cover assembly 12 and the first sidewall 111 are respectively connected to the two ends of the third sidewalls 113 in the third direction Z. The outer surface area of ​​the second sidewall 112 is larger than the outer surface area of ​​the third sidewall 113. The second sidewall 112 is referred to as the large sidewall of the shell body 11, and the third sidewall 113 is referred to as the small sidewall of the shell body 11. Since the first sidewall 111 and the top cover assembly 12 are arranged opposite each other along the third direction Z, the first sidewall 111 is referred to as the bottom sidewall of the shell body 11. That is, in this embodiment, the explosion-proof valve 3 is connected to the bottom sidewall of the shell body 11.

[0060] In some other embodiments, the explosion-proof valve 3 may also be connected to the large side wall of the shell body 11 or to the small side wall of the shell body 11.

[0061] like Figure 5As shown, the first sidewall 111 has a through-hole 1101 extending along the third direction Z. The explosion-proof valve 3 covers the through-hole 1101. The explosion-proof valve 3 is installed through the through-hole 1101, which is simple in structure and easy to install. The battery also includes a reinforcing member 4, which has a vent 401 extending along the third direction Z. The reinforcing member 4 is connected to the wall of the through-hole 1101. The explosion-proof valve 3 and the reinforcing member 4 are arranged along the third direction Z. The setting of the reinforcing member 4 can effectively improve the strength of the shell body 11 at the through-hole 1101, and the battery structure is reliable.

[0062] like Figure 5 As shown, the mounting through hole 1101 includes a first hole portion 1101A and a second hole portion 1101B connected along a third direction Z. The diameter of the first hole portion 1101A is larger than the diameter of the second hole portion 1101B. The reinforcing member 4 includes a first ring body 41 and a second ring body 42 connected along a third direction Z. The outer diameter of the first ring body 41 is larger than the outer diameter of the second ring body 42. The inner holes of the first ring body 41 and the second ring body 42 are interconnected to form a vent hole 401, which is used to discharge the gas generated by the battery thermal runaway to the outside of the battery. The outer peripheral surface of the first ring body 41 is connected to the outer peripheral surface of the first hole portion 1101A. The outer peripheral surface of the second ring 42 is connected to the hole wall of the second hole 1101B. Specifically, the mounting through hole 1101 has a stepped hole structure. At this time, the connecting surface between the peripheral wall of the second hole 1101B and the peripheral wall of the first hole 1101A plays a blocking role. Thus, when the reinforcing member 4 is installed on the shell body 11, the connecting surface can support the first ring 41 and play a positioning role, which facilitates the installation of the reinforcing member 4. This allows the reinforcing member 4 to be stably connected in the mounting through hole 1101, resulting in high battery structure reliability. For example, the reinforcing member 4 is connected to the shell body 11 by welding.

[0063] Furthermore, the strength of the reinforcing member 4 is greater than that of the shell body 11, thereby effectively improving the strength of the shell body 11. For example, the shell body 11 is made of aluminum, while the reinforcing member 4 is made of steel.

[0064] In this embodiment, as Figure 5 As shown, the first hole 1101A is located on the side of the second hole 1101B near the core 2, and the first ring 41 is located on the side of the second ring 42 near the shell body 11. At this time, the reinforcing member 4 is installed from the shell 1 onto the mounting through hole 1101. The connecting surface can play a positioning role, providing convenience for the installation of the reinforcing member 4.

[0065] In other embodiments, such as Figure 6As shown, the first hole 1101A is located on the side of the second hole 1101B away from the core 2, and the second ring 42 is located on the side of the first ring 41 close to the shell body 11. At this time, the reinforcing member 4 is installed from outside the shell 1 onto the mounting through hole 1101. The connecting surface can also play a positioning role, which facilitates the installation of the reinforcing member 4. Moreover, the welding of the reinforcing member 4 and the shell body 11 can be carried out outside the shell 1, which makes the installation of the reinforcing member 4 more convenient.

[0066] like Figure 5 As shown, the explosion-proof valve 3 is welded to the wall of the second hole 1101B, and the explosion-proof valve 3 is in contact with the second ring body 42. At this time, the second ring body 42 provides support for the explosion-proof valve 3, which can facilitate the installation of the explosion-proof valve 3 and make the connection between the explosion-proof valve 3 and the shell body 11 more stable.

[0067] In this embodiment, the explosion-proof valve 3 includes a valve body 31 and explosion-proof grooves 32. The valve body 31 is plate-shaped and connected to the housing body 11, covering the mounting through hole 1101. The explosion-proof grooves 32 are provided on the side of the valve body 31 in the third direction Z. This type of explosion-proof valve 3 has a simple structure, and the explosion-proof grooves 32 reduce the local strength of the valve body 31. When the pressure reaches the opening condition, the valve body 31 can quickly rupture along the groove direction, forming a large pressure relief channel, allowing the gas inside the battery to be quickly discharged. Rapid pressure relief can effectively reduce the accumulation of energy inside the battery, reduce the risk of thermal runaway, and prevent the battery from violently exploding or burning in a short time, providing reliable safety protection for the battery system; wherein, as Figure 2 and Figure 8 As shown, the explosion-proof groove 32 is annular and is set around the center of the valve body 31. When the explosion-proof valve 3 with this structure is opened, it will break evenly along the annular extension direction of the explosion-proof groove 32, thereby forming a relatively regular annular pressure relief channel. This can ensure that the high-pressure gas inside the battery can be discharged evenly to the outside, avoiding local excessive pressure or uneven pressure relief. It effectively prevents the battery from tilting, deforming or even exploding due to uneven gas discharge, and improves the stability and safety of the pressure relief process.

[0068] In other embodiments, such as Figure 7 As shown, the explosion-proof grooves 32 are arc-shaped, and there are multiple explosion-proof grooves 32. The multiple explosion-proof grooves 32 are arranged around the center of the valve body 31, and the arc-shaped openings of the explosion-proof grooves 32 face away from the center of the valve body 31. This type of explosion-proof valve 3 can also form a pressure relief channel when it is opened, ensuring that the high-pressure gas inside the battery can be smoothly discharged to the outside.

[0069] In other embodiments, such as Figure 9As shown, the explosion-proof grooves 32 are straight lines, and there are multiple explosion-proof grooves 32. The multiple explosion-proof grooves 32 are intersecting. This type of explosion-proof valve 3 can also form a pressure relief channel when it is opened, ensuring that the high-pressure gas inside the battery can be smoothly discharged to the outside.

[0070] In this embodiment, as Figure 4 As shown, the mounting through hole 1101 is elliptical, and its major axis extends along the second direction Y. The structure is simple and the processing difficulty is low. At this time, the shape of the valve body 31 of the explosion-proof valve 3 is also elliptical, which helps to optimize the stress distribution on the valve body 31. Moreover, the shape of the explosion-proof valve 3 and the mounting through hole 1101 are compatible, and the two can fit tightly together, which can keep the explosion-proof valve 3 stable during operation. In addition, the major axis of the explosion-proof valve 3 also extends along the second direction Y. At this time, in the third direction Z, the explosion-proof valve 3 has more positions facing the positions between two adjacent arc-shaped end faces 201. The portion of the explosion-proof valve 3 that surrounds the inner wall of the exhaust channel 100 is relatively large. That is, when the explosion-proof valve 3 is opened, more of its positions are not blocked, which can make the battery pressure relief effect better.

[0071] In other embodiments, such as Figure 10 As shown, the mounting through hole 1101 is arc-shaped, and the chord segment of the mounting through hole 1101 extends along the second direction Y. In the first direction X, the chord segment of the mounting through hole 1101 is located on the side of the arc segment away from the center of the first sidewall 111. At this time, the area of ​​the part of the mounting through hole 1101 near the end of the first sidewall 111 is relatively large, while the overall area of ​​the mounting through hole 1101 is relatively small. Thus, the impact of the mounting through hole 1101 on the strength of the shell body 11 can be reduced, making the battery more reliable. The explosion-proof valve 3 cooperates with the mounting through hole 1101 of this structure. In the third direction Z, the explosion-proof valve 3 has more positions facing the position between two adjacent arc-shaped end faces 201. The explosion-proof valve 3 forms a larger portion of the inner wall of the exhaust channel 100. That is, when the explosion-proof valve 3 is opened, more of its positions are not blocked, which can make the battery pressure relief effect better.

[0072] In other embodiments, such as Figure 11As shown, in the third direction Z, the mounting through hole 1101 is trapezoidal, and the lower bottom of the mounting through hole 1101 extends along the second direction Y. In the first direction X, the lower bottom of the mounting through hole 1101 is located on the side of the upper bottom away from the center of the first sidewall 111. Similarly, the area of ​​the part of the mounting through hole 1101 near the end of the first sidewall 111 is relatively large, while the overall area of ​​the mounting through hole 1101 is relatively small. Therefore, the impact of the mounting through hole 1101 on the strength of the shell body 11 can be reduced, making the battery more reliable. The explosion-proof valve 3 cooperates with the mounting through hole 1101 of this structure. In the third direction Z, the explosion-proof valve 3 has more positions facing the position between two adjacent arc-shaped end faces 201. The explosion-proof valve 3 forms a larger portion of the inner wall of the exhaust channel 100. That is, when the explosion-proof valve 3 is opened, more of its positions are not blocked, which can make the battery pressure relief effect better.

[0073] It should be noted that for the arched and trapezoidal mounting through-holes 1101, the explosion-proof valve 3 that mates with them can be elliptical. In this case, the explosion-proof valve 3 is connected to the wall surface of the first side wall 111 and covers the mounting through-hole 1101. Alternatively, the shape of the explosion-proof valve 3 can be adapted to the shape of the mounting through-hole 1101. In this case, the explosion-proof valve 3 is installed in the mounting through-hole 1101. This application does not impose any restrictions on this. In addition, the mounting through-hole 1101 of this structure can also be configured as a stepped structure with a first hole portion 1101A and a second hole portion 1101B. At the same time, a reinforcing member 4 can also be connected. In this case, the shape of the reinforcing member 4 is adapted to the structure of the first hole portion 1101A and the second hole portion 1101B. This application does not impose any restrictions on this.

[0074] In other embodiments, such as Figure 3 and Figure 12 As shown, in the first direction X, both ends of the core 2 have arc-shaped end faces 201, and both ends of the first sidewall 111 are provided with explosion-proof valves 3. Thus, the battery has two exhaust channels 100. When the battery is depressurized, the gas is discharged from both ends of the battery along the first direction X, resulting in uniform depressurization and better battery depressurization effect.

[0075] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A battery having intersecting first direction (X) and second direction (Y), characterized in that, The battery includes a casing (1), a winding core (2), and an explosion-proof valve (3); Along the first direction (X), the core (2) has an arc-shaped end face (201), and the core (2) is located inside the housing (1); Wherein, an exhaust channel (100) is formed between the arc-shaped end face (201) and the inner wall surface of the housing (1) near the end of the arc-shaped end face (201) in the first direction (X), the explosion-proof valve (3) is connected to the end of the housing (1) near the arc-shaped end face (201) in the first direction (X), and the side of the explosion-proof valve (3) facing the core (2) constitutes at least a portion of the inner wall surface of the exhaust channel (100).

2. The battery according to claim 1, characterized in that, The battery also has a third direction (Z), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The housing (1) includes a housing body (11) and a top cover assembly (12), the housing body (11) and the top cover assembly (12) are connected along the third direction (Z), the housing body (11) includes a first sidewall (111), the first sidewall (111) and the top cover assembly (12) are disposed opposite to each other along the third direction (Z), the core (2) is located inside the housing body (11), and the explosion-proof valve (3) is connected to the first sidewall (111).

3. The battery according to claim 2, characterized in that, The first sidewall (111) has a through mounting hole (1101) that extends through the third direction, and the explosion-proof valve (3) covers the through mounting hole (1101); The battery also includes a reinforcing member (4), which has an exhaust hole (401) extending through the third direction (Z) and is connected to the wall of the mounting through hole (1101). The explosion-proof valve (3) and the reinforcing member (4) are arranged along the third direction (Z).

4. The battery according to claim 3, characterized in that, The mounting through hole (1101) includes a first hole (1101A) and a second hole (1101B) connected in a third direction (Z), wherein the diameter of the first hole (1101A) is larger than the diameter of the second hole (1101B). The reinforcing member (4) includes a first ring body (41) and a second ring body (42), the first ring body (41) and the second ring body (42) are connected along the third direction (Z), the outer diameter of the first ring body (41) is larger than the outer diameter of the second ring body (42), and the inner holes of the first ring body (41) and the second ring body (42) are interconnected to form the exhaust hole (401); The outer peripheral surface of the first ring body (41) is connected to the hole wall surface of the first hole (1101A), and the outer peripheral surface of the second ring body (42) is connected to the hole wall surface of the second hole (1101B).

5. The battery according to claim 4, characterized in that, The first hole (1101A) is located on the side of the second hole (1101B) near the core (2); or, The first hole (1101A) is located on the side of the second hole (1101B) away from the core (2).

6. The battery according to claim 5, characterized in that, The explosion-proof valve (3) is connected to the hole wall of the second hole (1101B), and the explosion-proof valve (3) is in contact with the second ring (42).

7. The battery according to claim 3 or 6, characterized in that, The explosion-proof valve (3) includes a valve body (31) and explosion-proof grooves (32). The valve body (31) is plate-shaped and is connected to the shell body (11) and covers the mounting through hole (1101). The explosion-proof grooves (32) are provided on the side of the valve body (31) in the third direction (Z). in, The explosion-proof groove (32) is arc-shaped, and there are multiple explosion-proof grooves (32). The multiple explosion-proof grooves (32) are arranged around the center of the valve body (31), and the arc-shaped opening of the explosion-proof groove (32) faces away from the center of the valve body (31). or, The explosion-proof groove (32) is annular and is arranged around the center of the valve body (31); or, The explosion-proof grooves (32) are straight lines, and there are multiple explosion-proof grooves (32) intersecting each other.

8. The battery according to claim 3, characterized in that, The mounting through hole (1101) is elliptical in shape, and the major axis of the mounting through hole (1101) extends along the second direction (Y). or, The mounting through hole (1101) is arc-shaped, and the chord segment of the mounting through hole (1101) extends along the second direction (Y). In the first direction (X), the chord segment of the mounting through hole (1101) is located on the side of the arc segment away from the center of the first sidewall (111). or, The mounting through hole (1101) is trapezoidal, and the lower bottom of the mounting through hole (1101) extends along the second direction (Y). In the first direction (X), the lower bottom of the mounting through hole (1101) is located on the side of the upper bottom away from the center of the first sidewall (111).

9. The battery according to claim 2, characterized in that, In the first direction (X), both ends of the core (2) have the arc-shaped end face (201), and both ends of the first sidewall (111) are provided with the explosion-proof valve (3).

10. A battery pack, characterized in that, It includes a housing and a battery as described in any one of claims 1-9, the battery being connected to the housing.

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