Battery and battery pack

Abstract

The utility model discloses a battery and a battery pack. The battery comprises a pole shank, a shell and a top cover, the shell comprises a shell main body and a first boss, the shell main body is provided with an accommodating cavity, and the pole core is arranged in the accommodating cavity; the containing cavity is provided with a cavity opening and a cavity bottom which are oppositely arranged, and the first boss is arranged at the position, close to the cavity opening, of the inner side wall of the shell body; the top cover covers the cavity opening; the top cover comprises an extension part, a main body part and a second boss; the main body part is connected with the inner side wall of the shell main body, the extension part is arranged on one side, facing the cavity bottom, of the main body part, and the second boss is arranged on the outer side wall of the extension part; the second boss abuts against the inner side wall of the shell body, and the first boss abuts against the outer side wall of the extension part. Thus, on the basis that the top cover is connected with the shell through the main body part, the contact area between the shell and the top cover is increased through abutting connection between the shell and the second boss and abutting connection between the top cover and the first boss, and then the binding force between the shell and the top cover is increased.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery and a battery pack. BACKGROUND

[0002] With the rapid growth of the market scale of electric vehicles, power battery enterprises have also begun to flourish, so that the production and demand scale of batteries is continuously expanding. At present, square, cylindrical and soft package are three major packaging modes of power batteries. Among them, aluminum shell batteries occupy a large market. In the production process of square aluminum shell batteries, the battery cell is generally placed in the aluminum shell, and then the aluminum shell and the top cover are sealed and welded.

[0003] In the related art, the explosion-proof valve in the aluminum shell battery is arranged at the bottom, and when the battery cell is in thermal runaway, the explosion-proof valve at the bottom is used to release the gas. However, the explosion-proof valve is not quick enough to release the pressure, so that the battery cell still has a large gas pressure impacting the connection between the top cover and the aluminum shell, which is easy to cause the top cover and the shell to fall off, thereby causing safety problems. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a battery and a battery pack, which can solve the problem of low connection strength between the top cover and the aluminum shell in the prior art.

[0005] In order to solve the above technical problems, the application is implemented as follows:

[0006] In a first aspect, the embodiments of the application provide a battery, comprising: a battery core, a shell and a top cover; the shell comprises a shell main body and a first boss, the shell main body has a containing cavity, and the battery core is arranged in the containing cavity; the containing cavity has oppositely arranged cavity openings and cavity bottoms, and the first boss is arranged at a position close to the cavity opening on the inner side wall of the shell main body; the top cover is arranged at the cavity opening; the top cover comprises an extension, a main body and a second boss; the main body is connected with the inner side wall of the shell main body, the extension is arranged on one side of the main body towards the cavity bottom, and the second boss is arranged on the outer side wall of the extension; the second boss abuts against the inner side wall of the shell main body, and the first boss abuts against the outer side wall of the extension.

[0007] Optionally, the first boss and the second boss are both arranged in multiple; the multiple first bosses are arranged in a circumferential direction of the shell main body, and the multiple second bosses are arranged in a circumferential direction of the extension.

[0008] Optionally, the battery has a first direction Z, and the orthographic projection of the adjacent second boss and the first boss on a plane perpendicular to the first direction Z is at least partially staggered.

[0009] Optionally, a limiting gap is formed between two adjacent first protrusions, at least part of the limiting gap corresponds to the second protrusion, the second protrusion has a limiting portion, the limiting portion is in limiting cooperation with the two first protrusions forming the limiting gap, so as to limit the movement of the top cover away from the cavity bottom.

[0010] Optionally, the second protrusion further comprises a transition portion; the battery has a second direction Y, the second direction Y intersects the first direction Z; the transition portion is arranged on one side of the limiting portion facing the cavity bottom, and gradually decreases in size along the second direction Y.

[0011] Optionally, the inner side wall of the shell body comprises at least one set of oppositely arranged first side walls, wherein a plurality of first protrusions are arranged on the at least one set of oppositely arranged first side walls in a spaced manner, and the second protrusion is arranged on the outer side wall corresponding to the extension and the at least one set of oppositely arranged first side walls. Wherein, the first side wall is any one side wall of the battery. Optionally, the inner side wall of the shell body comprises two oppositely arranged first inner side walls and two oppositely arranged second inner side walls, the first inner side wall and the second inner side wall are connected to each other and form a first boundary line at the connection; a plurality of first protrusions are arranged on the first inner side wall, the first protrusion closest to the first boundary line in the plurality of first protrusions is a first end protrusion, the distance from the first end protrusion to the first boundary line in the direction perpendicular to the first boundary line is L1, and satisfies: 0mm < L ≤ 5mm; or, the outer side wall of the extension comprises two oppositely arranged first outer side walls and two oppositely arranged second outer side walls, the first outer side wall and the second outer side wall are connected to each other and form a second boundary line at the connection; a plurality of second protrusions are arranged on the first outer side wall, the second protrusion closest to the second boundary line in the plurality of second protrusions is a second end protrusion, the distance from the second end protrusion to the second boundary line in the direction perpendicular to the second boundary line is L2, and satisfies: 0mm < L ≤ 5mm. Optionally, the distance from the first protrusion to the edge of the shell body near the cavity opening in the direction from the cavity opening to the cavity bottom is H, and satisfies: 0mm ≤ H ≤ 2mm; and / or, the distance from the second protrusion to the end surface of the main body portion on the side facing the first protrusion in the direction from the cavity opening to the cavity bottom is H, and satisfies: 0mm ≤ H ≤ 1mm.

[0012] Optionally, the battery has a first direction Z and a third direction X intersecting; a size of the first boss along the first direction Z is A, a size of the first boss along the third direction X is B, satisfying: 0mm < A≤ B; and / or, a size of the second boss along the first direction Z is C, a size of the second boss along the third direction X is D, satisfying: 0mm < C≤ D.

[0013] Optionally, the battery further comprises an explosion-proof valve; the explosion-proof valve is arranged on a side of the shell away from the top cover.

[0014] In a second aspect, the embodiments of the present application provide a battery pack, comprising the battery as described in the above embodiments.

[0015] In the embodiments of the present application, by arranging the pole core in the accommodation cavity, arranging the first boss on the inner side wall of the shell body close to the cavity opening, arranging the top cover on the cavity opening, connecting the main body part of the top cover with the inner side wall of the shell body, arranging the extension part on a side of the main body part facing the cavity bottom, and arranging the second boss on the outer side wall of the extension part, the inner side wall of the shell body abuts against the second boss, and the outer side wall of the extension part abuts against the first boss. In this way, on the basis of connecting the shell with the top cover through the main body part, the shell is caused to abut against the outer side wall of the extension part through the first boss, and the top cover is caused to abut against the inner side wall of the shell body through the second boss, so as to increase the contact area between the shell and the top cover, and further increase the bonding force between the shell and the top cover, so as to reduce the risk of the top cover being detached from the shell when the battery is in thermal runaway, and improve the safety performance of the pole core when the battery is in thermal runaway.

[0016] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:

[0018] Figure 1 is a schematic view of a battery according to an embodiment of the present application;

[0019] Figure 2 is a schematic view of another perspective of a battery according to an embodiment of the present application;

[0020] Figure 3 is a partial sectional view of a battery according to an embodiment of the present application;

[0021] Figure 4 is a sectional view of the cooperation of a first boss and a second boss according to an embodiment of the present application;

[0022] Figure 5is a schematic view of a shell according to an embodiment of the present application;

[0023] Figure 6 is a top view of a shell according to an embodiment of the present application;

[0024] Figure 7 is a partial sectional view of a first boss in a shell according to an embodiment of the present application;

[0025] Figure 8 is a schematic view of a top cover according to an embodiment of the present application;

[0026] Figure 9 is a partial side view of a top cover according to an embodiment of the present application;

[0027] Figure 10 is a partial front view of a top cover according to an embodiment of the present application;

[0028] Figure 11 is an enlarged view of a second boss according to an embodiment of the present application.

[0029] Reference Signs:

[0030] 1 - shell; 11 - shell body; 12 - first boss; 2 - top cover; 21 - extension; 22 - body portion; 23 - second boss; 231 - limiting portion; 232 - transition portion; 3 - accommodating cavity; 4 - explosion-proof valve; 5 - limiting gap; Z - first direction; Y - second direction; X - third direction. DETAILED DESCRIPTION

[0031] Embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same or similar reference numbers throughout the several views. The embodiments described below are examples for explaining the present application and are not intended to limit the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative work fall within the scope of the present application.

[0032] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0033] 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", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship 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.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] The battery and battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0036] Optionally, such as Figures 1 to 11 As shown in the embodiment of this application, a battery is proposed, including: an electrode core, a housing 1, and a top cover 2; the housing 1 includes a housing body 11 and a first protrusion 12, the housing body 11 has a receiving cavity 3, and the electrode core is disposed in the receiving cavity 3; the receiving cavity 3 has a cavity opening and a cavity bottom disposed opposite to each other, and the first protrusion 12 is disposed on the inner side wall of the housing body 11 near the cavity opening; the top cover 2 is disposed on the cavity opening; the top cover 2 includes an extension 21, a main body 22, and a second protrusion 23; the main body 22 is connected to the inner side wall of the housing body 11, the extension 21 is disposed on the side of the main body 22 facing the cavity bottom, and the second protrusion 23 is disposed on the outer side wall of the extension 21; the second protrusion 23 abuts against the inner side wall of the housing body 11, and the first protrusion 12 abuts against the outer side wall of the extension 21.

[0037] In the embodiment of the present application, by arranging the pole core in the accommodating cavity 3; arranging the first boss 12 on the inner side wall of the shell body 11 close to the cavity opening; arranging the top cover 2 on the cavity opening; connecting the main body part 22 of the top cover 2 with the inner side wall of the shell body 11, arranging the extension part 21 on one side of the main body part 22 towards the cavity bottom, and arranging the second boss 23 on the outer side wall of the extension part 21; abutting the second boss 23 with the inner side wall of the shell body 11, and abutting the first boss 12 with the outer side wall of the extension part 21. In this way, on the basis of connecting the top cover 2 with the shell 1 through the main body part 22, the shell 1 is also abutted with the outer side wall of the extension part 21 through the first boss 12, and the top cover 2 is abutted with the inner side wall of the shell body 11 through the second boss 23, thereby increasing the contact area between the shell 1 and the top cover 2, and further increasing the bonding force between the shell 1 and the top cover 2, so as to reduce the risk of the top cover 2 being pulled out of the shell 1 when the battery is in thermal runaway, and improve the safety performance of the pole core when the thermal runaway occurs.

[0038] In some embodiments, the shell 1 and the top cover 2 are connected together by welding; specifically, as shown in Figure 3 , the main body part 22 protrudes around the extension part 21, and the protruding part of the main body part 22 is connected together with the inner side wall of the shell body 11 by welding. In this way, the top cover 2 and the shell 1 are connected with each other.

[0039] In the prior art, when the battery is in thermal runaway, the explosion-proof valve 4 arranged at the bottom of the battery does not release pressure quickly enough, resulting in that the battery still has a large gas pressure impacting the welding seam between the top cover 2 and the shell 1; on the basis of the shell 1 and the top cover 2 being originally welded, the present application is abutted with the outer side wall of the extension part 21 through the first boss 12, and is abutted with the inner side wall of the shell body 11 through the second boss 23, so that when the battery is in thermal runaway, the friction force between the first boss 12 and the extension part 21 under the impact of the gas pressure and the friction force between the second boss 23 and the shell body 11 under the impact of the gas pressure are generated, thereby increasing the bonding force between the shell 1 and the top cover 2.

[0040] Alternatively, as shown in Figure 5 and Figure 8 , the first boss 12 and the second boss 23 are both arranged in multiple; the multiple first bosses 12 are arranged in intervals along the circumference of the shell body 11, and the multiple second bosses 23 are arranged in intervals along the circumference of the extension part 21.

[0041] In the embodiments of the present application, the first boss 12 and the second boss 23 are both provided in plurality; the plurality of first bosses 12 are arranged at intervals along the circumference of the shell body 11, and the plurality of second bosses 23 are arranged at intervals along the circumference of the extension 21. In this way, the plurality of first bosses 12 and the outer side wall of the extension 21 are abutted, and the plurality of second bosses 23 and the inner side wall of the shell 1 are abutted, thereby further increasing the contact area between the shell 1 and the top cover 2, and improving the bonding force between the shell 1 and the top cover 2.

[0042] In some embodiments, the distance between the plurality of first bosses 12 arranged at intervals can be the same as or different from the distance between the plurality of second bosses 23 arranged at intervals; further, the distance between any two adjacent first bosses 12 arranged at intervals on the same inner side wall can be the same as or different from that on the same outer side wall.

[0043] Optionally, as shown in Figure 4 and Figure 5 , the battery has a first direction Z, which is the height direction of the battery; the orthographic projections of the adjacent second boss 23 and the first boss 12 on a plane perpendicular to the first direction Z are at least partially staggered.

[0044] As shown in Figure 1 and Figure 5 , the height direction of the battery is the first direction Z, the length direction of the battery is the second direction Y, and the width direction of the battery is the third direction X.

[0045] In the embodiments of the present application, the orthographic projections of the adjacent second boss 23 and the first boss 12 along the first direction Z are at least partially staggered. In this way, it is avoided that the second boss 23 and the first boss 12 directly abut together to reduce the contact area between the shell 1 and the top cover 2; in addition, it is also convenient for the second boss 23 to enter the limiting gap 5 by using the part that does not coincide with the first boss 12, thereby facilitating the installation between the shell 1 and the top cover 2.

[0046] In some embodiments, the orthographic projections of the adjacent second boss 23 and the first boss 12 along the first direction Z are at least partially staggered, including: the orthographic projections of the second boss 23 and the first boss 12 along the first direction Z are completely staggered; or, as shown in Figure 4 , the orthographic projections of the second boss 23 and the first boss 12 along the first direction Z are partially staggered.

[0047] In some embodiments, during the assembly of the shell 1 and the top cover 2, the first boss 12 in the shell 1 and the second boss 23 in the top cover 2 can be abutted together through interference fit. Specifically, the first boss 12 can be abutted together with the second boss 23 through its own upper tolerance; or the second boss 23 is abutted together with the first boss 12 through its own lower tolerance.

[0048] In some embodiments, as shown in Figure 3 , the first boss 12 and the second boss 23 can also be alternately arranged up and down along the first direction Z.

[0049] Optionally, as shown in Figure 4 , Figure 5 and Figure 9 , a limiting gap 5 is formed between two adjacent first bosses 12, and at least part of the limiting gap 5 corresponds to the second boss 23. The second boss 23 has a limiting portion 231, which is in limiting fit with the two first bosses 12 forming the limiting gap 5, so as to limit the movement of the top cover 2 away from the cavity bottom.

[0050] In the embodiments of the present application, by forming a limiting gap 5 between two adjacent first bosses 12, and at least part of the limiting gap 5 corresponds to the second boss 23, the second boss 23 has a limiting portion 231, which is in limiting fit with the two first bosses 12 forming the limiting gap 5. In this way, when the battery is in thermal runaway, the relative displacement between the first boss 12 and the main body 22 and the relative displacement between the second boss 23 and the shell main body 11 can be limited by the mutual abutment between the first boss 12 and the second boss 23, so as to limit the relative displacement between the top cover 2 and the shell 1, thereby avoiding the top cover 2 from being pulled out of the shell 1 when the battery is in thermal runaway.

[0051] In some embodiments, as shown in Figure 4 , each limiting gap 5 can correspond to one second boss 23. In this way, the space of the limiting gap 5 can be fully utilized, and the first boss 12 can be in limiting fit with the two first bosses 12 forming the limiting gap 5. Of course, one second boss 23 can also be arranged corresponding to every other limiting gap 5, or one second boss 23 can be arranged corresponding to every other limiting gap 5. The number of intervals of the limiting gap 5 is not limited in the embodiments of the present application.

[0052] In some embodiments, the structures of the first boss 12 and the second boss 23 can be set to the same shape or different shapes; the structures of the first boss 12 and the second boss 23 can be set to at least one of an ellipsoid, a cuboid, a fusiform, a triangular prism, and a square.

[0053] Exemplarily, as shown in Figure 11As shown, the structure of the second boss 23 can be set as an ellipse, and the limiting portion 231 is a portion in the middle of the semicircle, which can be arranged in the limiting gap 5 or below the limiting gap 5, and the embodiments of the present application are not limited here.

[0054] Optionally, as shown in Figure 11 , the second boss 23 further includes a transition portion 232; the battery has a second direction Y, and the second direction Y is perpendicular to the first direction Z; the transition portion 232 is arranged on the side of the limiting portion 231 facing the cavity bottom and along the first direction Z, and the size of the transition portion 232 along the second direction Y gradually decreases.

[0055] It should be noted that the second direction Y is the length direction of the battery. In the embodiments of the present application, the transition portion 232 is arranged on the side of the limiting portion 231 facing the cavity bottom and along the first direction Z, and the size of the transition portion 232 along the second direction Y gradually decreases. In this way, when the top cover 2 is assembled with the shell 1, it is convenient for the first boss 12 to pass through the limiting gap 5 through the transition portion 232, thereby facilitating the assembly between the top cover 2 and the shell 1.

[0056] Specifically, as shown in Figure 4 and Figure 11 , when the top cover 2 is assembled with the shell 1, the second boss 23 can pass through the limiting gap 5 formed by the adjacent two first bosses 12 through the transition portion 232, and then the limiting portion 231 is arranged in the limiting gap 5 and the transition portion 232 is arranged below the limiting gap 5, thereby realizing the abutment between the first boss 12 and the second boss 23.

[0057] Optionally, as shown in Figure 5 and Figure 8 , the shell body 11 has at least one set of oppositely arranged inner side walls; the two oppositely arranged inner side walls are set as first side walls, and a plurality of first bosses 12 are arranged on the two first side walls in a spaced manner, and the second boss 23 is arranged on the outer side wall corresponding to the first side wall of the extension portion 21.

[0058] In the embodiments of the present application, the inner side wall of the shell body 11 is arranged to have at least one set of oppositely arranged first side walls, and a plurality of first bosses 12 are arranged on the at least one set of oppositely arranged first side walls in a spaced manner, and the second boss 23 is arranged on the outer side wall corresponding to the first side wall of the extension portion 21. In this way, when the battery is in thermal runaway, it is beneficial to make the force between the top cover 2 and the shell 1 more uniform, and can avoid the problem of uneven force between the top cover 2 and the shell 1 caused by the arrangement of the first boss 12 and the second boss 23 on one side.

[0059] In some embodiments, as shown in Figure 5 and Figure 6 , the first side wall can be as shown in Figure 5 andFigure 6 The inner side wall where the first protrusion 12 is located can also be as shown in Figure 5 and Figure 6 The two inner side walls of the first protrusion 12 that are not temporarily provided can also be as shown in

[0060] Optionally, as shown in Figure 4 The shell body 11 includes two oppositely arranged first inner side walls and two oppositely arranged second inner side walls, the first inner side wall and the second inner side wall are connected to each other and form a first boundary line at the connection, that is, the first boundary line is an intersection line formed by the intersection of the plane where the first inner side wall is located and the plane where the second inner side wall is located; a plurality of first protrusions 12 are arranged on the first inner side wall, and the first protrusion 12 closest to the first boundary line among the plurality of first protrusions 12 is a first end protrusion, and the distance from the first end protrusion to the first boundary line in a direction perpendicular to the first boundary line is L1, which satisfies: 0mm < L1≤ 5mm.

[0061] In the embodiment of the application, a plurality of first protrusions 12 are arranged on the first inner side wall, and the first protrusion 12 closest to the first boundary line among the plurality of first protrusions 12 is a first end protrusion, and the distance L1 from the first end protrusion to the first boundary line in a direction perpendicular to the first boundary line satisfies a certain range. In this way, the problem of insufficient first protrusions 12 and second protrusions 23 of the edge portion of the top cover 2 and the edge portion of the shell 1 leading to local stress concentration is avoided, thereby reducing the connection strength between the top cover 2 and the shell 1. It should be noted that the first inner side wall and the second inner side wall can be any side wall of the battery.

[0062] Exemplarily, the distance L1 can be set to: 0.1mm, 0.5mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Any numerical value or a range between any two numerical values.

[0063] Optionally, as shown in Figure 4 The outer side wall of the extension 21 includes two oppositely arranged first outer side walls and two oppositely arranged second outer side walls, the first outer side wall and the second outer side wall are connected to each other and form a second boundary line at the connection, that is, the second boundary line is an intersection line formed by the intersection of the plane where the first outer side wall is located and the plane where the second outer side wall is located; a plurality of second protrusions 23 are arranged on the first outer side wall, and the second protrusion 23 closest to the second boundary line among the plurality of second protrusions 23 is a second end protrusion, and the distance from the second end protrusion to the second boundary line in a direction perpendicular to the second boundary line is L2, which satisfies: 0mm < L2≤ 5mm.

[0064] In the embodiments of the present application, by providing a plurality of second bosses 23 on the first outer side wall, the second boss 23 closest to the second boundary line among the plurality of second bosses 23 is a second end boss, and the distance L2 from the second end boss to the second boundary line in the direction perpendicular to the second boundary line satisfies a certain range. In this way, the problem of insufficient connection strength between the first boss 12 and the edge portion of the outer side wall of the top cover 2 caused by excessively large spacing is avoided, and the connection strength between the top cover 2 and the shell 1 is further reduced.

[0065] Exemplarily, the spacing L2 can be set to 0.1 mm, 0.5 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or any value or range between any two values.

[0066] Optionally, as shown in Figure 5 and Figure 7 , from the cavity opening to the cavity bottom, the spacing of the first boss 12 to the edge of the shell body 11 close to the cavity opening is H1, which satisfies 0mm≤H1≤2mm.

[0067] In the embodiments of the present application, the spacing H1 of the first boss 12 to the edge of the shell body 11 close to the cavity opening is set within a certain range. In this way, the problem of insufficient connection strength between the first boss 12 and the outer side wall of the top cover 2 caused by excessively large spacing can be avoided.

[0068] Exemplarily, the spacing H1 of the first boss 12 to the edge of the shell 1 close to the cavity opening can be set to 0 mm, 0.5 mm, 1.0 mm, 1.5 mm, 2 mm, or any value or range between any two values.

[0069] Optionally, as shown in Figure 5 and Figure 7 , from the cavity opening to the cavity bottom, the spacing of the second boss 23 to the side end face of the main body portion 22 facing the first boss 12 is H2, which satisfies 0mm≤H2≤1mm.

[0070] In the embodiments of the present application, the spacing H2 of the second boss 23 to the side end face of the main body portion 22 facing the first boss 12 is set within a certain range. In this way, the problem of insufficient connection strength between the second boss 23 and the inner side wall of the shell 1 caused by excessively large spacing can be avoided.

[0071] Exemplarily, the spacing H2 of the second boss 23 to the side end face of the main body portion 22 facing the first boss 12 can be set to 0 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, or any value or range between any two values.

[0072] Optionally, as shown inFigure 7 As shown, the battery has a first direction Z and a third direction X that are perpendicular to each other. The first direction Z is the height direction of the battery. The first boss 12 has a dimension A along the first direction Z and a dimension B along the third direction X, satisfying: 0mm<A≤B.

[0073] It should be noted that the third direction X refers to the width direction of the battery. In this embodiment, the dimension A of the first protrusion 12 along the first direction Z is set to be less than or equal to the dimension B of the first protrusion 12 along the third direction X. This avoids the problem of low structural strength of the first protrusion 12 due to dimensional inconsistency.

[0074] In some embodiments, such as Figure 7 As shown, the dimension of the first boss 12 along the first direction Z is A, which satisfies: 0mm < A ≤ 1.5mm. In this way, the dimension A of the first boss 12 along the first direction Z is not too large, which would affect the receiving height of the pole core in the receiving cavity 3 in the housing 1.

[0075] For example, the dimension A of the first boss 12 along the first direction Z can be set to any value or a range between any two values, such as 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm.

[0076] In some embodiments, such as Figure 7 As shown, the dimension of the first boss 12 along the third direction X is B, which satisfies: 0mm < B ≤ 2mm. This avoids the first boss 12 having an excessively large dimension B along the third direction X, which would result in a low connection strength between the first boss 12 and the extension 21 in the top cover 2.

[0077] For example, the dimension B of the first boss 12 along the third direction X can be set to any value or a range between any two values, such as 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 2.0mm.

[0078] Optionally, such as Figure 7 As shown, the second boss 23 has a dimension of C along the first direction Z and a dimension of D along the third direction X, satisfying: 0mm<C≤D.

[0079] In this embodiment, the dimension C of the second boss 23 along the first direction Z is set to be less than or equal to the dimension D of the second boss 23 along the third direction X. This avoids the problem of low structural strength of the second boss 23 due to dimensional inconsistencies.

[0080] In some embodiments, such as Figure 9As shown, the size of the second boss 23 along the first direction Z is C, which satisfies: 0mm < C≤1.5mm. In this way, the size C of the second boss 23 along the first direction Z is prevented from being too large to increase the thickness of the top cover 2, thereby increasing the cost of the battery.

[0081] Exemplarily, the size C of the second boss 23 along the first direction Z can be set to be: 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, or any value or range between any two values.

[0082] In some embodiments, as shown, Figure 9 As shown, the size of the second boss 23 along the third direction X is D, which satisfies: 0mm < D≤2mm. In this way, the size D of the second boss 23 along the third direction X is prevented from being too large to make the protruding part of the main body 22 along the third direction X too large, thereby affecting the connection strength between the top cover 2 and the shell 1.

[0083] It should be noted that, as shown, Figure 9 The protruding part of the main body 22 refers to the part of the main body 22 along the projection on the plane perpendicular to the first direction Z covering the part of the extension 21 along the projection on the plane perpendicular to the first direction Z.

[0084] Exemplarily, the size D of the second boss 23 along the third direction X can be set to be: 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm, 2.0mm, or any value or range between any two values.

[0085] Optionally, as shown, Figure 2 The battery further includes an explosion-proof valve 4; the explosion-proof valve 4 is arranged on the side of the shell 1 away from the top cover 2.

[0086] In the embodiments of the present application, the explosion-proof valve 4 is arranged on the side of the shell 1 away from the top cover 2. In this way, when the battery is in thermal runaway, the explosion-proof valve 4 is opened, and since the explosion-proof valve 4 cannot timely release the high-temperature and high-pressure gas in the accommodation cavity 3, a large air pressure in the core still exists and impacts the connection between the top cover 2 and the aluminum shell along the first direction Z, causing the top cover 2 to fall off. The present application avoids the problem that the low connection strength between the shell 1 and the top cover 2 causes the top cover 2 to fall off by arranging the first boss 12 and the second boss 23, thereby improving the safety performance of the core when thermal runaway occurs.

[0087] Optionally, the embodiments of the present application also provide a battery pack, which includes the battery in the above embodiments.

[0088] In the embodiment of the present application, the pole core is arranged in the accommodating cavity 3; the first boss 12 is arranged on the inner side wall of the shell body 11 close to the cavity opening; the top cover 2 is arranged on the cavity opening; the main body part 22 of the top cover 2 is connected with the inner side wall of the shell body 11, the extension part 21 is arranged on the side of the main body part 22 facing the cavity bottom, and the second boss 23 is arranged on the outer side wall of the extension part 21; the second boss 23 abuts against the inner side wall of the shell body 11, and the first boss 12 abuts against the outer side wall of the extension part 21. In this way, on the basis of the connection of the top cover 2 with the shell 1 through the main body part 22, the shell 1 is also caused to abut against the outer side wall of the extension part 21 through the first boss 12, and the top cover 2 is caused to abut against the inner side wall of the shell body 11 through the second boss 23, so that the contact area between the shell 1 and the top cover 2 is increased, and then the bonding force between the shell 1 and the top cover 2 is increased, so as to reduce the risk of the top cover 2 being pulled out of the shell 1 when the battery is in thermal runaway, and improve the safety performance of the pole core when the thermal runaway occurs.

[0089] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0090] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery, characterized by, The battery comprises: a pole core, a shell (1) and a top cover (2); the shell (1) comprises a shell body (11) and a first boss (12), the shell body (11) has a containing cavity (3), the pole core is arranged in the containing cavity (3); the containing cavity (3) has oppositely arranged cavity openings and a cavity bottom, the first boss (12) is arranged on the inner side wall of the shell body (11) near the cavity opening; the top cover (2) is arranged on the cavity opening; the top cover (2) comprises an extension part (21), a main body part (22) and a second boss (23); the main body part (22) is connected with the inner side wall of the shell body (11), the extension part (21) is arranged on one side of the main body part (22) facing the cavity bottom, and the second boss (23) is arranged on the outer side wall of the extension part (21); the second boss (23) abuts against the inner side wall of the shell body (11), and the first boss (12) abuts against the outer side wall of the extension part (21).

2. The battery of claim 1, wherein, Both the first boss (12) and the second boss (23) are provided with a plurality of bosses; a plurality of the first bosses (12) are arranged along the circumference of the shell body (11) at intervals, and a plurality of the second bosses (23) are arranged along the circumference of the extension part (21) at intervals.

3. The battery of claim 2, wherein, The battery has a first direction (Z), and the orthographic projections of adjacent second bosses (23) and first bosses (12) on a plane perpendicular to the first direction (Z) are at least partially staggered.

4. The battery of claim 3, wherein, A limiting gap (5) is formed between two adjacent first bosses (12), at least part of the limiting gap (5) corresponds to the second boss (23), the second boss (23) has a limiting part (231), the limiting part (231) is limitedly matched with the two first bosses (12) forming the limiting gap (5) to limit the movement of the top cover (2) in the direction away from the cavity bottom.

5. The battery of claim 4, wherein, The second boss (23) further comprises a transition part (232); The battery has a second direction (Y) intersecting the first direction (Z); the transition part (232) is arranged on one side of the limiting part (231) facing the cavity bottom, and along the first direction (Z), the size of the transition part (232) along the second direction (Y) gradually decreases.

6. The battery of claim 1, wherein, The inner side wall of the shell body (11) comprises at least one set of oppositely arranged first side walls, wherein a plurality of the first bosses (12) are arranged on the first side walls at intervals, respectively, and the second boss (23) is arranged on the outer side wall of the extension part (21) corresponding to the first side wall.

7. The battery of claim 1, wherein, The inner side wall of the shell body (11) comprises two oppositely arranged first inner side walls and two oppositely arranged second inner side walls, which are connected to each other and form a first junction line at the connection; a plurality of first bosses (12) are arranged on the first inner side wall, and the first boss (12) closest to the first junction line is a first end boss, and the distance from the first end boss to the first junction line in the direction perpendicular to the first junction line is L1, which satisfies: 0mm < L1≤ 5mm; Alternatively, the outer side wall of the extension part (21) comprises two oppositely arranged first outer side walls and two oppositely arranged second outer side walls, which are connected to each other and form a second junction line at the connection; a plurality of second bosses (23) are arranged on the first outer side wall, and the second boss (23) closest to the second junction line is a second end boss, and the distance from the second end boss to the second junction line in the direction perpendicular to the second junction line is L2, which satisfies: 0mm < L2≤ 5mm.

8. The battery of claim 1, wherein, In the direction from the cavity opening to the cavity bottom, the distance from the first boss (12) to the edge of the side of the shell body (11) close to the cavity opening is H1, which satisfies: 0mm≤ H1≤ 2mm; And / or, In the direction from the cavity opening to the cavity bottom, the distance from the second boss (23) to the side end face of the body part (22) towards the first boss (12) is H2, which satisfies: 0mm≤ H2≤ 1mm.

9. The battery of claim 1, wherein, The battery has intersecting first direction (Z) and third direction (X); The size of the first boss (12) in the first direction (Z) is A, and the size of the first boss (12) in the third direction (X) is B, which satisfies: 0mm < A≤ B; And / or, the size of the second boss (23) in the first direction (Z) is C, and the size of the second boss (23) in the third direction (X) is D, which satisfies: 0mm < C≤ D.

10. The battery of any one of claims 1-9, wherein, The battery further comprises an explosion-proof valve (4); the explosion-proof valve (4) is arranged on the side of the shell (1) away from the top cover (2).

11. A battery pack, characterized by The battery comprises the battery as claimed in any one of claims 1-10. The battery comprises the battery as claimed in any one of claims 1-10.

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