Battery shell and battery

Abstract

The utility model provides a battery shell and a battery, and relates to the technical field of batteries. The battery shell comprises a shell, a pole and a first connecting piece, the shell comprises a side wall structure, the side wall structure comprises a first side wall and a second side wall which are connected with each other, the pole is located on the second side wall, the second side wall is provided with a first through hole, and the pole is arranged in the first through hole in a penetrating mode. The first connecting piece is arranged in the shell, one end of the first connecting piece is connected with the first side wall, and the other end of the first connecting piece is located on the second side wall and connected with the pole. Therefore, the connection at the pole and the connection at the tab of the battery are not easy to influence each other.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery case and a battery. Background Art

[0002] A battery is a device that can convert chemical energy into electrical energy and is widely used in electrical equipment.

[0003] A battery may include a battery case and an electrode core. The battery case includes an outer shell and a pole column. The electrode core is disposed inside the outer shell. The pole column penetrates through the side wall structure of the outer shell and is electrically connected to the electrode core through an electrode tab. The pole column is used to connect to a mating component (for example, a battery protection board) located outside the outer shell to achieve electrical connection between the electrode core and the mating component.

[0004] In the related art, the connection at the pole column and the connection at the electrode tab are prone to affect each other. Summary of the Utility Model

[0005] This application aims to provide a battery case and a battery to solve the problem that the connection at the pole column and the connection at the electrode tab in the prior art are prone to affect each other.

[0006] In a first aspect of this application, a battery case is provided. The battery case includes an outer shell, a pole column, and a first connection piece. The outer shell includes a side wall structure. The side wall structure includes a first side wall and a second side wall that are connected to each other. The pole column is located on the second side wall. The second side wall has a first through hole, and the pole column penetrates through the first through hole. The first connection piece is disposed inside the outer shell. One end of the first connection piece is connected to the first side wall, and the other end of the first connection piece is located on the second side wall and is connected to the pole column.

[0007] For the battery case provided in this application, the first side wall can be used to face the electrode tab end of the electrode core. One end of the first connection piece located on the first side wall can be connected to the first electrode tab of the electrode core. The first connection piece can electrically connect the first electrode tab located on the first side wall and the second side wall to the pole column. The distance between the first electrode tab and the pole column is relatively large. The connection at the first electrode tab and the connection at the pole column are not prone to affect each other, and it is not easy to have a problem that the connection structures of the first electrode tab and the pole column are stacked, resulting in a large occupied space at the electrode tab end, which is beneficial to reducing the interval between the electrode tab end and the side wall structure, and further beneficial to improving the energy density of the battery.

[0008] Optionally, the second side wall is adjacent to the first side wall, and the first side wall and the second side wall form an outward convex angle structure.

[0009] Optionally, the side wall structure further includes a third side wall. The second side wall is connected to the third side wall. The second side wall and the third side wall are adjacent to each other, and the second side wall and the third side wall form an inward concave angle structure.

[0010] Optionally, the battery case further includes a first insulating sheet. The first insulating sheet is disposed between the first connecting piece and the outer shell. The first connecting piece and the outer shell are insulated from each other by the first insulating sheet. The first connecting piece is disposed on the inner surface of the outer shell through the first insulating sheet, and the pole column penetrates through the first insulating sheet.

[0011] Optionally, the two side edges of the first insulating sheet in the thickness direction of the outer shell respectively have a first limiting portion and a second limiting portion. The first connecting piece is located between the first limiting portion and the second limiting portion. The first limiting portion and the second limiting portion are respectively used to prevent the two side edges of the first connecting piece in the thickness direction of the outer shell from contacting the outer shell.

[0012] Optionally, the battery case further includes a second insulating sheet. The second insulating sheet is disposed between the pole column and the outer shell. The pole column and the outer shell are insulated from each other by the second insulating sheet. The pole column penetrates through the second insulating sheet.

[0013] Optionally, the outer shell further includes a cover plate and a bottom plate. The cover plate and the bottom plate are respectively located on the two sides of the side wall structure in the thickness direction of the outer shell. The cover plate and the bottom plate are connected to the side wall structure. The cover plate, the bottom plate and the side wall structure enclose to form the inner cavity of the outer shell. The surface at at least one corner of the cover plate has a pressure relief groove.

[0014] In a second aspect of the present application, a battery is provided. The battery includes a battery cell and the battery case in any of the above embodiments. The battery cell is disposed inside the outer shell of the battery case. The battery cell includes a tab end, and a first tab and a second tab are provided at the tab end. The first side wall of the battery case is opposite to the tab end, and the first connecting piece of the battery case is located at one end of the first side wall and is connected to the first tab.

[0015] Optionally, the pole column of the battery case includes a columnar portion and a connecting portion located outside the second side wall of the battery case. An included angle a is formed between the extending direction of the columnar portion and the extending direction of the first tab, and 30° ≤ a ≤ 100°.

[0016] Optionally, the end of the first connecting piece connected to the first tab and the end of the first connecting piece connected to the pole column of the battery case are respectively located on different sides of the battery cell.

[0017] Optionally, the battery further includes a pressure relief sealing cover. The first side wall has a second through hole. The pressure relief sealing cover is connected to the outer surface of the first side wall, and the pressure relief sealing cover seals the second through hole. The pressure relief sealing cover includes a fixing ring, a sealing cover and an adhesive layer. The fixing ring is fixedly connected to the outer surface of the first side wall. The fixing ring has a communication hole, and the communication hole communicates with the second through hole. The sealing cover is adhesively connected to the side of the fixing ring away from the first side wall through the adhesive layer, and the sealing cover seals the communication hole.

[0018] Optionally, the sealing cover includes a covering portion and a protruding portion. The covering portion is covered on the side of the fixing ring away from the first side wall, the protruding portion is disposed on the side of the covering portion facing the first side wall, the protruding portion is inserted into the communication hole, the adhesive layer includes a bent portion bent in the direction close to the battery cell, and the covering portion is bonded to the side of the fixing ring away from the first side wall through the adhesive layer.

[0019] Optionally, the opening area of the second through hole is greater than 1.2 times the opening area of the communication hole.

[0020] Optionally, the fixing ring includes an adhesive portion, the adhesive portion is bonded to the sealing cover through the adhesive layer, and the distance between the outer edge of the adhesive portion and the edge of the communication hole is greater than 0.5 mm.

[0021] Optionally, the projection of the first connecting piece in the first direction does not overlap with the projection of the second through hole in the first direction.

[0022] Optionally, the battery further includes a second connecting piece, and the second connecting piece is fixedly connected to the outer surface of the second side wall of the battery case. The second pole ear is connected to the first side wall, and the second pole ear is electrically connected to the second connecting piece through the outer shell.

[0023] Optionally, the battery cell includes a first sub - portion and a second sub - portion, and both the first sub - portion and the second sub - portion face the second side wall of the battery case. The portion of the first connecting piece located on the second side wall is disposed between the first sub - portion and the second side wall, and the distance between the edge of the first sub - portion close to the second side wall and the second side wall is greater than the distance between the edge of the second sub - portion close to the second side wall and the second side wall.

[0024] Optionally, the battery further includes a second connecting piece, and the second connecting piece is fixedly connected to the outer surface of the second side wall. The projection of the second connecting piece in the second direction does not overlap with the projection of the first sub - portion in the second direction.

[0025] Optionally, the battery further includes a third insulating sheet, and the third insulating sheet is disposed between the first connecting piece and the battery cell, and the first connecting piece and the battery cell are insulated through the third insulating sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 Schematic diagram of a battery provided by an embodiment of the present application;

[0028] Figure 2 ForFigure 1 An exploded view of the battery provided in

[0029] Figure 3 For Figure 1 A schematic diagram after the cover plate of the battery provided in

[0030] Figure 4 A cross-sectional view of the connection between the terminal post and the housing provided in an embodiment of the present application;

[0031] Figure 5 For Figure 1 Another exploded view of the battery provided in

[0032] Figure 6 For Figure 1 A partial schematic diagram of the battery provided in

[0033] Figure 7 A cross-sectional view of the connection between the pressure relief seal cover and the housing provided in an embodiment of the present application;

[0034] Figure 8 Another cross-sectional view of the connection between the pressure relief seal cover and the housing provided in an embodiment of the present application;

[0035] Figure 9 For Figure 1 A partial cross-sectional view of the battery provided in

[0036] Figure 10 Another schematic diagram of the battery provided in an embodiment of the present application;

[0037] Figure 11 For Figure 10 The exploded view of the battery provided;

[0038] Figure 12 For Figure 10 The cross-sectional view of the battery provided.

[0039] Explanation of reference numerals:

[0040] 100, housing; 110, side wall structure; 111, first side wall; 112, second side wall; 113, third side wall; 114, fourth side wall; 115, fifth side wall; 116, first through hole; 117, second through hole; 120, bottom plate; 130, cover plate; 131, pressure relief groove;

[0041] 200, battery cell; 210, tab end; 211, first tab; 212, second tab; 213, first protruding portion; 214, second protruding portion; 220, first part; 221, first sub - part; 222, second sub - part; 230, second part;

[0042] 300. First connecting piece; 310. Fifth through hole;

[0043] 400. Terminal post; 410. Columnar part; 420. Connecting part;

[0044] 500. Pressure relief sealing cover; 510. Fixed ring; 511. Communication hole; 512. Bonding part; 520. Sealing cover; 521. Cover connecting part; 522. Protruding part; 530. Adhesive layer;

[0045] 600. Second connecting piece;

[0046] 700. First insulating sheet; 710. First limiting part; 720. Second limiting part; 730. Third through hole;

[0047] 800. Second insulating sheet; 810. Sheet part; 820. Sleeve part; 830. Fourth through hole;

[0048] x. Length direction of the battery; y. Width direction of the battery; z. Thickness direction of the battery. Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the scope of protection of this application.

[0050] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In this application, unless otherwise clearly defined and limited, the terms such as "installed", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the connection inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In this application, unless otherwise clearly defined and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0053] In the above description, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. 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 this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] The embodiments of this application provide an electrical device, which may include but is not limited to mobile phones, tablet computers, laptop computers, walkie-talkies, POS machines, etc.

[0055] In the embodiments of this application, the electrical device may include a battery and a load, the battery is electrically connected to the load, and the battery can be used to supply power to the load.

[0056] Exemplarily, the electrical device may include multiple loads, and any one of the loads may include but is not limited to a processor, a display screen, a camera, etc.

[0057] Figure 1 It is a schematic diagram of a battery proposed for the embodiments of this application. Among them, the x-direction is the length direction of the battery, the y-direction is the width direction of the battery, the z-direction is the thickness direction of the battery, the length direction of the battery is perpendicular to the width direction of the battery, the length direction of the battery is perpendicular to the thickness direction of the battery, and the width direction of the battery is perpendicular to the thickness direction of the battery.

[0058] As Figure 1 shown, in the embodiments of this application, the battery includes a battery case, and the battery case includes a housing 100, and the housing 100 may be a metal case. The length direction of the housing 100 is the same as the length direction of the battery, the width direction of the housing 100 is the same as the width direction of the battery, and the thickness direction of the housing 100 is the same as the thickness direction of the battery.

[0059] The housing 100 includes a cover plate 130, a bottom plate 120 and a side wall structure 110. The cover plate 130 and the bottom plate 120 are respectively located on both sides of the side wall structure 110 in the thickness direction of the housing 100. The cover plate 130 and the bottom plate 120 are connected to the side wall structure 110. The side wall structure 110 surrounds the outer edge of the bottom plate 120 for one week. The cover plate 130 can be connected to the side of the side wall structure 110 facing away from the bottom plate 120. The cover plate 130, the bottom plate 120 and the side wall structure 110 enclose to form the inner cavity of the housing 100.

[0060] Exemplarily, the side wall structure 110 and the bottom plate 120 can be an integral structure.

[0061] Exemplarily, the cover plate 130 can be connected to the side wall structure 110 by one or more of welding, fastener connection, bonding, etc.

[0062] Figure 2 For Figure 1 an exploded view of the battery provided in Figure 3 For Figure 1 a schematic diagram after the cover plate of the battery provided in

[0063] Such as Figure 2 , Figure 3 , the battery further includes a battery cell 200. The battery cell 200 is disposed in the housing 100. That is to say, the housing 100 is used to accommodate the battery cell 200. The length direction of the battery cell 200 is the same as the length direction of the battery. The width direction of the battery cell 200 is the same as the width direction of the battery. The thickness direction of the battery cell 200 is the same as the thickness direction of the battery.

[0064] The battery cell 200 includes a tab end 210. The tab end 210 is provided with a first tab 211 and a second tab 212. Both the first tab 211 and the second tab 212 are located in the housing 100. One of the first tab 211 and the second tab 212 is a positive tab, and the other of the first tab 211 and the second tab 212 is a negative tab.

[0065] The battery cell 200 includes stacked first electrode plates, separators and second electrode plates. The first electrode plates and the second electrode plates can be alternately arranged. The adjacent first electrode plates and second electrode plates are separated by separators. The first tab 211 is connected to the first electrode plate, and the second tab 212 is connected to the second electrode plate. One of the first electrode plate and the second electrode plate is a positive electrode plate, and the other of the first electrode plate and the second electrode plate is a negative electrode plate. The positive tab is connected to the positive electrode plate, and the negative tab is connected to the negative electrode plate.

[0066] To make the manufacturing of the battery cell 200 easier, the separator can be folded in a "Z" shape to form a plurality of partition parts distributed in the thickness direction of the battery cell 200. Adjacent two partition parts are connected by a hem, and a partition part is inserted between adjacent first and second electrode plates. The hem is located on the side of the first or second electrode plate between the two partition parts it connects on both sides.

[0067] The first electrode plate has a first extending part 213, and the first electrode plate is connected to the first tab 211 through the first extending part 213. For example, the first extending part 213 can be welded to the first tab 211. The second electrode plate has a second extending part 214, and the second electrode plate is connected to the second tab 212 through the second extending part 214. For example, the second extending part 214 can be welded to the second tab 212.

[0068] To facilitate the connection between the first extending part 213 and the first tab 211, and the connection between the second extending part 214 and the second tab 212, the outside of the tab end 210 needs to be not blocked by the separator. That is to say, when the separator includes partition parts and hems, there is no hem on the outside of the tab end 210.

[0069] In the embodiment of the present application, the battery case further includes a pole column 400. The side wall structure 110 has a first through hole 116, and the pole column 400 is inserted into the first through hole 116, and the pole column 400 is electrically connected to the first tab 211.

[0070] In the related art, the pole column is often located on the side wall of the side wall structure for facing the tab end. At this time, the connection at the pole column is likely to affect the connection at the first tab, and it is easy to have the problem that the connection structures of the first tab and the pole column are stacked, resulting in a large occupied space at the tab end, making the interval between the tab end and the side wall structure larger, and affecting the improvement of the energy density of the battery.

[0071] Figure 4 It is a cross-sectional view of the connection between the pole column and the outer shell provided by the embodiment of the present application.

[0072] As Figure 4 shown, and referring to Figure 2 、 Figure 3 Based on this, in the embodiment of the present application, the side wall structure 110 includes a first side wall 111 and a second side wall 112 connected to each other. The first side wall 111 and the second side wall 112 are arranged along the circumferential direction of the outer shell 100. The first side wall 111 faces the tab end 210, and the second side wall 112 has a first through hole 116, and the pole column 400 is located on the second side wall 112.

[0073] The battery case further includes a first connecting piece 300 disposed within the outer case 100. The two ends of the first connecting piece 300 extend along the circumferential direction of the outer case 100. One end of the first connecting piece 300 is connected to the first side wall 111 and is connected to the first tab 211, and the other end of the first connecting piece 300 is located at the second side wall 112 and is connected to the terminal post 400, such that the terminal post 400 is electrically connected to the first tab 211 through the first connecting piece 300.

[0074] In this way, the first connecting piece 300 can electrically connect the first tab 211 and the terminal post 400 which are respectively located at the first side wall 111 and the second side wall 112. The distance between the first tab 211 and the terminal post 400 is relatively large, and the connection at the first tab 211 and the connection at the terminal post 400 are not likely to affect each other. It is not easy to have the problem that the connection structures of the first tab 211 and the terminal post 400 are stacked, resulting in a large occupied space at the tab end 210, which is beneficial to reducing the interval between the tab end 210 and the side wall structure 110, and further beneficial to improving the energy density of the battery.

[0075] One end of the first connecting piece 300 connected to the first tab 211 is located at the first side wall 111.

[0076] A part of the first connecting piece 300 is located on the inner surface of the first side wall 111 and a part is located on the inner surface of the second side wall 112.

[0077] Exemplarily, the end of the first connecting piece 300 connected to the first tab 211 and the end of the first connecting piece 300 connected to the terminal post 400 are respectively located on different sides of the battery cell 200.

[0078] In this way, the connection at the first tab 211 and the connection at the terminal post 400 are not likely to affect each other. In addition, it is not easy to have the problem that the connection structures of the first tab 211 and the terminal post 400 are stacked, resulting in a large occupied space at the tab end 210.

[0079] Exemplarily, the terminal post 400 includes a columnar portion 410 inserted into the first through hole 116 and a connection portion 420 located outside the side wall structure 110. The first connecting piece 300 is connected to the columnar portion 410, and the connection portion 420 is electrically connected to the load, such that the battery can supply power to the load.

[0080] In this way, it is easy for the terminal post 400 to electrically connect the battery cell 200 and the load.

[0081] In some examples, the terminal post 400 can be riveted to the first connecting piece 300, that is to say, the columnar portion 410 can be riveted to the first connecting piece 300. In this way, the connection between the terminal post 400 and the first connecting piece 300 can be made more stable.

[0082] In some other examples, the terminal post 400 can be bonded to the first connecting piece 300, that is to say, the columnar portion 410 can be bonded to the first connecting piece 300.

[0083] Exemplarily, the electrical device further includes a mating component. For example, the mating component can be a battery protection board. The connecting portion 420 is fixed to and electrically connected to the mating component, and the mating component is electrically connected to the load, so that the connecting portion 420 can be electrically connected to the load through the mating component.

[0084] Exemplarily, the mating component has a first terminal, the connecting portion 420 is fixed to and electrically connected to the first terminal, and the connecting portion 420 is electrically connected to the load through the first terminal.

[0085] Exemplarily, the connecting portion 420 can be connected to the mating component by means such as welding or bonding with conductive adhesive.

[0086] In some examples, the battery can include a mating component.

[0087] In some other examples, the mating component can also be a component independent of the battery.

[0088] As Figure 2 、 Figure 3 shown, the battery further includes a second connecting piece 600. The second connecting piece 600 is fixedly connected to the outer surface of the side wall structure 110. The second tab 212 is connected to the first side wall 111, and the second tab 212 is electrically connected to the second connecting piece 600 through the housing 100.

[0089] In this way, the second tab 212 is electrically connected to the second connecting piece 600 through the housing 100, which can make the distance between the tab end 210 and the side wall structure 110 smaller, facilitating the improvement of the energy density of the battery. In addition, through the housing 100, the second tab 212 and the second connecting piece 600 can be arranged in a staggered manner, so that the connection of the second tab 212 and the connection of the second connecting piece 600 are not easily affected by each other, and it is not easy to have the problem that the connection structure of the second tab 212 and the connection structure of the second connecting piece 600 are stacked, resulting in a large occupied space and thus affecting the energy density of the battery.

[0090] The second connecting piece 600 is electrically connected to the load to form a current loop.

[0091] In some examples where the electrical device includes a mating component, the second connecting piece 600 is fixed to and electrically connected to the mating component, and the mating component is electrically connected to the load, so that the second connecting piece 600 can be electrically connected to the load through the mating component.

[0092] Exemplarily, the mating component has a second terminal, the second connecting piece 600 is fixed to and electrically connected to the second terminal, and the second connecting piece 600 is electrically connected to the load through the second terminal.

[0093] Exemplarily, the second connection piece 600 can be connected to the side wall structure 110 by means of welding, conductive adhesive bonding, etc.

[0094] Exemplarily, the second connection piece 600 can be connected to the mating component by means of welding, conductive adhesive bonding, etc.

[0095] In some possible embodiments, the second connection piece 600 is fixedly connected to the outer surface of the second side wall 112.

[0096] In this way, it is more convenient for the mating component to be connected to both the second connection piece 600 and the connection portion 420 simultaneously.

[0097] In some possible embodiments, the second side wall 112 is disposed adjacent to the first side wall 111, and the first side wall 111 and the second side wall 112 form an outward convex corner structure.

[0098] In this way, when manufacturing the battery cell 200 by using a diaphragm folded in a "Z" shape, it is convenient to arrange the folded edge of the diaphragm on the side other than the side opposite to the first side wall 111 of the battery cell 200, so as to facilitate arranging the first pole ear and the second pole ear on the side of the battery cell 200 opposite to the first side wall 111. In addition, the length of the first connection piece 300 can be made shorter, which is beneficial to reducing the impedance of the first connection piece 300, and thus the impedance of the battery can be reduced. Moreover, the shorter length of the first connection piece 300 is also beneficial to improving the energy density of the battery.

[0099] Both ends of the first side wall 111 form an outward convex corner structure.

[0100] Exemplarily, the first connection piece 300 can be an "L" - shaped structure.

[0101] In some possible embodiments, the side wall structure 110 further includes a third side wall 113. The first side wall 111, the second side wall 112, and the third side wall 113 are arranged along the circumferential direction of the housing 100. The second side wall 112 is connected to the third side wall 113, and the second side wall 112 and the third side wall 113 are adjacent to each other. The second side wall 112 and the third side wall 113 form an inward concave corner structure, that is to say, the outer sides of the second side wall 112 and the third side wall 113 form an inward concave region.

[0102] In this way, the outer shell 100 has a protruding portion that protrudes towards the outer periphery of the outer shell 100, which is conducive to improving the space utilization rate of the electrical device. In addition, the protruding portion can also increase the space inside the outer shell 100, and a part of the battery cell 200 can be accommodated in the protruding portion, which is conducive to increasing the capacity of the battery. Additionally, the pole post 400 is located on the second side wall 112, facilitating the electrical connection between the first tab 211 and the mating component within the concave area formed outside the second side wall 112 and outside the third side wall 113 through the pole post 400. The first tab 211 does not need to be arranged at the concave portion on the edge of the battery cell 200, facilitating the manufacturing of the battery cell 200 through a "Z"-shaped folded separator, and making it easier to manufacture the battery cell 200 that can be electrically connected to the mating component in the concave area arranged outside the side wall structure 110.

[0103] The edge of the battery cell 200 is concave at a position opposite to the concave area formed outside the second side wall 112 and outside the third side wall 113. If the adjacent first electrode plate and the second electrode plate are separated by a partition formed by a "Z"-shaped folded separator, there is a folded edge of the separator outside the concave portion on the edge of the battery cell 200.

[0104] Both ends of the second side wall 112 are respectively connected to the first side wall 111 and the third side wall 113.

[0105] In some possible implementation manners, the side wall structure 110 further includes a fourth side wall 114 and a fifth side wall 115. The fourth side wall 114 is disposed opposite to the second side wall 112, and the fifth side wall 115 is disposed opposite to the third side wall 113. The battery cell 200 includes a first portion 220 located between the second side wall 112 and the fourth side wall 114, and a second portion 230 located between the third side wall 113 and the fifth side wall 115.

[0106] In this way, the space occupancy rate of the battery cell 200 within the outer shell 100 is relatively high, enabling the battery to have a relatively large energy density.

[0107] In some possible implementation manners, both ends of one of the second side wall 112 and the third side wall 113 extend along the length direction of the outer shell 100, and both ends of the other of the second side wall 112 and the third side wall 113 extend along the width direction of the outer shell 100, and a right-angled structure is formed between the second side wall 112 and the third side wall 113.

[0108] In this way, it is convenient to make the battery cell 200 have a relatively high space occupancy rate within the outer shell 100, enabling the battery to have a relatively large energy density.

[0109] Such as Figure 2 、 Figure 4As shown, in some possible embodiments, the battery case further includes a first insulating sheet 700. The first insulating sheet 700 is disposed between the first connecting piece 300 and the outer shell 100. The first connecting piece 300 and the outer shell 100 are insulated by the first insulating sheet 700. The first connecting piece 300 is disposed on the inner surface of the outer shell 100 through the first insulating sheet 700, and the pole column 400 penetrates through the first insulating sheet 700.

[0110] In this way, it is convenient to dispose the first connecting piece 300 on the inner surface of the side wall structure 110, and the first insulating sheet 700 can prevent the first connecting piece 300 from being electrically connected to the outer shell 100.

[0111] Exemplarily, the columnar portion 410 penetrates through the first insulating sheet 700.

[0112] The first insulating sheet 700 covers the surface of the first connecting piece 300 facing the side wall structure 110, so that the first connecting piece 300 and the outer shell 100 have good insulation performance.

[0113] In some possible embodiments, the battery case further includes a second insulating sheet 800. The second insulating sheet 800 is disposed between the pole column 400 and the outer shell 100. The pole column 400 and the outer shell 100 are insulated by the second insulating sheet 800, and the pole column 400 penetrates through the second insulating sheet 800.

[0114] In this way, it is convenient to dispose the pole column 400 on the side wall structure 110, and the second insulating sheet 800 can prevent the pole column 400 from being electrically connected to the outer shell 100.

[0115] Exemplarily, the connecting portion 420 is disposed on the outer surface of the outer shell 100 through the second insulating sheet 800, and the columnar portion 410 penetrates through the second insulating sheet 800.

[0116] In some possible embodiments, the battery further includes a third insulating sheet disposed between the first connecting piece 300 and the battery cell 200. The first connecting piece 300 and the battery cell 200 are insulated by the third insulating sheet.

[0117] In this way, the third insulating sheet can prevent the first connecting piece 300 from being electrically connected to the battery cell 200.

[0118] The third insulating sheet can be disposed on the surface of the first connecting piece 300 facing the battery cell 200, or can be disposed on the surface of the battery cell 200 facing the first connecting piece 300.

[0119] Figure 5 For Figure 1 another exploded view of the battery provided in

[0120] As Figure 5 shown, and referring to Figure 4, the first insulating sheet 700 has a third through hole 730, the second insulating sheet 800 has a fourth through hole 830, the first connecting sheet 300 has a fifth through hole 310, the columnar portion 410 is inserted into the first through hole 116, the third through hole 730, the fourth through hole 830 and the fifth through hole 310, the columnar portion 410 is riveted to the first connecting sheet 300, the first connecting sheet 300 presses and fixes the first insulating sheet 700 on the side wall structure 110, and the connecting portion 420 presses and fixes the second insulating sheet 800 on the side wall structure 110.

[0121] The first connecting sheet 300 presses and fixes the first insulating sheet 700 on the inner surface of the second side wall 112, and the connecting portion 420 presses and fixes the second insulating sheet 800 on the outer surface of the second side wall.

[0122] In some examples, the second insulating sheet 800 includes a sheet portion 810 and a sleeve portion 820. The sheet portion 810 is located between the connecting portion 420 and the outer surface of the side wall structure 110. The connecting portion 420 is insulated from the outer surface of the side wall structure 110 through the sheet portion 810. The sleeve portion 820 is inserted into the first through hole 116. The sleeve portion 820 is sleeved between the columnar portion 410 and the hole wall of the first through hole 116. The columnar portion 410 is insulated from the hole wall of the first through hole 116 through the sleeve portion 820. The sleeve portion 820 is used to surround and form the fourth through hole 830.

[0123] Figure 6 For Figure 1 a partial schematic view of the battery provided in

[0124] As Figure 6 shown, the first insulating sheet 700 respectively has a first limiting portion 710 and a second limiting portion 720 at both side edges in the thickness direction of the outer shell 100. The first connecting sheet 300 is located between the first limiting portion 710 and the second limiting portion 720. The first limiting portion 710 and the second limiting portion 720 are respectively used to prevent both side edges of the first connecting sheet 300 in the thickness direction of the outer shell 100 from contacting the outer shell 100. That is to say, the first limiting portion 710 and the second limiting portion 720 are respectively used to prevent the first connecting sheet 300 from contacting the cover plate 130 and the bottom plate 120, so that the first connecting sheet 300 is insulated from the cover plate 130 and the bottom plate 120.

[0125] In this way, a better insulation performance can be achieved between the first connecting sheet 300 and the outer shell 100.

[0126] At least part of the projection of the first connecting sheet 300 in the thickness direction of the outer shell 100 is located within the projection of the first limiting portion 710 in the thickness direction of the outer shell 100, and at least part of the projection of the first connecting sheet 300 in the thickness direction of the outer shell 100 is located within the projection of the second limiting portion 720 in the thickness direction of the outer shell 100.

[0127] Exemplarily, both the first limiting portion 710 and the second limiting portion 720 can be flanging structures or bump structures.

[0128] Figure 7 This is a cross-sectional view of the connection between a pressure relief seal cover and a housing provided by an embodiment of the present application.

[0129] As Figure 7 shown, and referring to Figure 5 shown, in some possible implementation manners, the battery further includes a seal cover. The first side wall 111 has a second through hole 117. The seal cover is connected to the outer surface of the first side wall 111, and the seal cover seals the second through hole 117.

[0130] In this way, liquid can be injected into the housing 100 through the second through hole 117, and it is more convenient to inject liquid into the housing 100. In addition, when pressure is relieved through the second through hole 117, the electrolyte sprayed out from the second through hole 117 is not easily sprayed onto the mating components and is not likely to damage the mating components. Additionally, the second through hole 117 is located on the side wall opposite to the tab end 210, which is beneficial to improving the wetting effect of the electrolyte. The terminal 400 and the second through hole 117 are not on the same side wall, so that the terminal 400 is not likely to interfere with the liquid injection through the second through hole 117, and the wetting efficiency of the electrolyte can be improved.

[0131] Exemplarily, the projection of the first connecting piece 300 in the first direction does not overlap with the projection of the second through hole 117 in the first direction. The first direction is the direction from the tab end 210 pointing to the first side wall 111. The first direction is perpendicular to the extending direction of the first side wall 111. The first direction can be perpendicular to the thickness direction of the housing 100. The first direction can be the length direction or the width direction of the housing 100. For example, when the two ends of the first side wall 111 extend along the length direction of the housing 100, the first direction can be the width direction of the housing 100. Another example is that when the two ends of the first side wall 111 extend along the width direction of the housing 100, the first direction can be the length direction of the housing 100.

[0132] In this way, the first connecting piece 300 will not block the liquid injection and pressure relief through the second through hole 117, and it is easier to inject liquid and relieve pressure through the second through hole 117.

[0133] Exemplarily, the seal cover is a pressure relief seal cover 500. The pressure relief seal cover 500 is used to communicate the second through hole 117 with the outside of the housing 100 when the temperature is greater than or equal to a preset temperature.

[0134] In this way, when the temperature of the battery is greater than or equal to the preset temperature, pressure can be relieved through the second through hole 117, so that the battery is not likely to have problems such as catching fire and explosion, which is beneficial to improving the safety of the battery.

[0135] Exemplarily, the preset temperature can be 100°C to 160°C.

[0136] As Figure 5 , Figure 7 shown, in some possible embodiments, the pressure relief sealing cover 500 includes a fixing ring 510, a sealing cover 520, and an adhesive layer 530. The fixing ring 510 is fixedly connected to the outer surface of the first side wall 111, and the edge of the second through hole 117 is covered by the fixing ring 510. The fixing ring 510 has a communication hole 511, and the orthographic projection of the communication hole 511 on the first side wall 111 is located within the second through hole 117, and the communication hole 511 communicates with the second through hole 117. The sealing cover 520 is adhered to one side of the fixing ring 510 facing away from the first side wall 111 through the adhesive layer 530, and the sealing cover 520 seals the communication hole 511. The adhesive layer 530 is used to melt when the temperature is greater than or equal to the preset temperature, so that the sealing cover 520 is detached from the fixing ring 510.

[0137] In this way, it is convenient to achieve pressure relief through the second through hole 117 when the battery temperature is greater than or equal to the preset temperature. In addition, when the battery temperature is less than the preset temperature, the pressure relief sealing cover 500 seals the second through hole 117 more stably, and problems such as leakage are not likely to occur.

[0138] Exemplarily, the adhesive layer 530 can be formed by hot melt adhesive.

[0139] Exemplarily, the opening area of the second through hole 117 is greater than 1.2 times the opening area of the communication hole 511.

[0140] In this way, the bonding area between the fixing ring 510 and the sealing cover 520 can be larger and the bonding is more stable, which is beneficial to improving the sealing degree of the adhesive layer 530. In addition, the larger opening area of the second through hole 117 is also convenient for liquid injection.

[0141] Exemplarily, the fixing ring 510 includes an adhesive portion 512, the adhesive portion 512 is adhered to the sealing cover 520 through the adhesive layer 530, and the distance between the outer edge of the adhesive portion 512 and the edge of the communication hole 511 is greater than 0.5 mm.

[0142] In this way, the bonding area between the fixing ring 510 and the sealing cover 520 can be larger and the bonding is more stable, which is beneficial to improving the sealing degree of the adhesive layer 530.

[0143] Exemplarily, the fixing ring 510 is a metal ring and the sealing cover 520 is a metal cover. In this way, the sealing performance of the fixing ring 510 and the sealing cover 520 is better, and the electrolyte is not easily leaked out through the fixing ring 510 and the sealing cover 520.

[0144] Exemplarily, the fixing ring 510 is welded to the first side wall 111.

[0145] Exemplarily, the second through-hole 117 is located between the first tab 211 and the second tab 212.

[0146] Figure 8 This is another cross-sectional view of the connection between the pressure relief sealing cover and the housing provided by the embodiments of the present application.

[0147] As Figure 8 shown, in some examples, the sealing cover 520 includes a covering portion 521 and a protruding portion 522. The covering portion 521 is covered on the side of the fixing ring 510 away from the first side wall 111, and the protruding portion 522 is provided on the side of the covering portion 521 facing the first side wall 111. The protruding portion 522 penetrates through the communication hole 511. The glue layer 530 includes a bent portion bent in the direction close to the battery cell 200. The covering portion 521 is bonded to the side of the fixing ring 510 away from the first side wall 111 through the glue layer 530.

[0148] In this way, the bonding area between the fixing ring 510 and the sealing cover 520 is large and the bonding is relatively firm, which is beneficial to improving the sealing degree of the glue layer 530. In addition, the glue layer 530 can bond the sealing cover 520 and the fixing ring 510 in the direction parallel to the covering portion 521 and the direction perpendicular to the covering portion 521, and the bonding stability is good, and the sealing cover 520 is not easily detached from the fixing ring 510.

[0149] At least one of the surface of the protruding portion 522 and the hole wall of the communication hole has a bent portion. That is to say, the glue layer 530 is bonded to at least one of the surface of the protruding portion 522 and the hole wall of the communication hole.

[0150] Exemplarily, the bent portion can penetrate through the communication hole 511.

[0151] In some examples, at least part of the protruding portion 522 can be bonded to the hole wall of the communication hole 511 through the glue layer 530.

[0152] In some other possible embodiments, the pressure relief sealing cover 500 can be made of a shape memory alloy. The pressure relief sealing cover 500 is used to deform when the temperature is greater than or equal to a preset temperature, so that the second through-hole 117 communicates with the outside of the housing 100.

[0153] As Figure 1 、 Figure 2 shown, in some possible embodiments, the surface of the cover plate 130 has a pressure relief groove 131. The thickness of the cover plate 130 at the pressure relief groove 131 is relatively thin.

[0154] In this way, when the pressure inside the housing 100 is greater than the preset pressure, the housing 100 is crushed at the pressure relief groove 131 to make the inside and outside of the housing 100 communicate, and the pressure relief effect can be achieved.

[0155] In some possible embodiments, the surface at at least one corner of the cover plate 130 has a pressure relief groove 131.

[0156] In this way, the pressure inside the housing 100 is relatively high at the corners of the cover plate 130, which is conducive to using the pressure inside the housing 100 to crush the pressure relief groove 131 to connect the inside and outside of the housing 100, and is conducive to improving the safety of the battery.

[0157] In some examples, the surface at the concave corner of the cover plate 130 has a pressure relief groove 131.

[0158] In some examples, the surface at the convex corner of the cover plate 130 has a pressure relief groove 131.

[0159] Figure 9 For Figure 1 a partial cross-sectional view of the battery provided in

[0160] As Figure 9 shown, in some examples, the first part 220 of the battery cell 200 includes a first sub-part 221 and a second sub-part 222, and both the first sub-part 221 and the second sub-part 222 face the second side wall 112. The portion of the first connecting piece 300 located on the second side wall 112 is disposed between the first sub-part 221 and the second side wall 112, and the distance between the edge of the first sub-part 221 close to the second side wall 112 and the second side wall 112 is greater than the distance between the edge of the second sub-part 222 close to the second side wall 112 and the second side wall 112.

[0161] In this way, the distance between the edge of the first sub-part 221 close to the second side wall 112 and the second side wall 112 is used to avoid the first connecting piece 300 and the pole post 400, the second sub-part 222 can be disposed close to the second side wall 112, and the energy density of the battery can be relatively high.

[0162] Exemplarily, the distance between the edge of the first sub-part 221 close to the second side wall 112 and the second side wall 112 is d1, the distance between the edge of the second sub-part 222 close to the second side wall 112 and the second side wall 112 is d2, and the difference between d1 and d2 is greater than or equal to 0.3 mm and less than or equal to 1 mm.

[0163] In this way, it is convenient to avoid the first connecting piece 300 and the pole post 400. In addition, the battery can have a relatively high energy density.

[0164] In some possible embodiments, an angle a is formed between the extending direction of the columnar part 410 and the extending direction of the first tab 211, and 30° ≤ a ≤ 100°.

[0165] In this way, the connection at the first tab 211 and the connection at the terminal 400 are not likely to affect each other.

[0166] The extending direction of the first tab 211 can be the length direction of the battery cell 200 or the width direction of the battery cell 200. For example, when the tab end 210 is located on one side in the length direction of the battery cell 200, the extending direction of the first tab 211 can be the length direction of the battery cell 200. Another example is that when the tab end 210 is located on one side in the width direction of the battery cell 200, the extending direction of the first tab 211 can be the width direction of the battery cell 200.

[0167] In some possible embodiments, the projection of the second connecting piece 600 in the second direction does not overlap with the projection of the first sub - part 221 in the second direction. The second direction is the direction from the side of the battery cell 200 opposite to the second side wall 112 towards the second side wall 112. The second direction is perpendicular to the extending direction of the second side wall 112. The second direction can be perpendicular to the thickness direction of the housing 100. The second direction can be the length direction or the width direction of the housing 100. For example, when the two ends of the second side wall 112 extend along the length direction of the housing 100, the second direction can be the width direction of the housing 100. Another example is that when the two ends of the second side wall 112 extend along the width direction of the housing 100, the second direction can be the length direction of the housing 100.

[0168] In this way, the battery can have a relatively high energy density.

[0169] As Figure 3 shown, in some examples, the two ends of the first side wall 111 extend along the width direction of the housing 100, the two ends of the second side wall 112 extend along the length direction of the housing 100, the two ends of the third side wall 113 extend along the width direction of the housing 100, and the tab end 210 is located on one side in the length direction of the battery cell 200.

[0170] Exemplarily, the dimension of the third side wall 113 in the width direction of the housing 100 is smaller than the dimension of the second side wall 112 in the length direction of the housing 100, and the dimension of the third side wall 113 in the width direction of the housing 100 is smaller than the dimension of the first side wall 111 in the width direction of the housing 100.

[0171] Figure 10 This is a schematic diagram of another battery provided by the embodiment of the present application. Figure 11 For Figure 10 the provided battery, an exploded view. Figure 12 For Figure 10 the provided battery, a cross - sectional view.

[0172] As Figure 10 - Figure 12As shown, in some other examples, both ends of the first side wall 111 extend along the length direction of the outer shell 100, both ends of the second side wall 112 extend along the width direction of the outer shell 100, both ends of the third side wall 113 extend along the length direction of the outer shell 100, and the tab end 210 is located on one side in the width direction of the battery cell 200.

[0173] Exemplarily, the dimension of the third side wall 113 in the length direction of the outer shell 100 is greater than the dimension of the second side wall 112 in the width direction of the outer shell 100, and the dimension of the third side wall 113 in the length direction of the outer shell 100 is greater than the dimension of the first side wall 111 in the length direction of the outer shell 100.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery case, characterized in that: It comprises a housing (100), a pole (400) and a first connecting piece (300); The housing (100) comprises a side wall structure (110), the side wall structure (110) comprises a first side wall (111) and a second side wall (112) connected to each other, the pole (400) is located on the second side wall (112), the second side wall (112) has a first through hole (116), and the pole (400) is inserted into the first through hole (116); The first connecting piece (300) is arranged in the housing (100), one end of the first connecting piece (300) is connected to the first side wall (111), and the other end of the first connecting piece (300) is located on the second side wall (112) and connected to the pole (400).

2. The battery case according to claim 1, characterized in that: The second side wall (112) is arranged adjacent to the first side wall (111), and the first side wall (111) and the second side wall (112) form an outer convex angle structure.

3. The battery case according to claim 1, characterized in that: The side wall structure (110) further comprises a third side wall (113), the second side wall (112) being connected to the third side wall (113), the second side wall (112) being adjacent to the third side wall (113), and the second side wall (112) and the third side wall (113) forming an inner concave angle structure.

4. The battery case according to any one of claims 1 to 3, characterized in that: Also includes a first insulating sheet (700); The first insulating sheet (700) is arranged between the first connecting sheet (300) and the outer shell (100), the first connecting sheet (300) and the outer shell (100) are insulated by the first insulating sheet (700), the first connecting sheet (300) is arranged on the inner surface of the outer shell (100) through the first insulating sheet (700), and the pole (400) passes through the first insulating sheet (700).

5. The battery case according to claim 4, characterized in that: The first insulating sheet (700) has a first limiting portion (710) and a second limiting portion (720) at both side edges in the thickness direction of the housing (100), respectively, and the first connecting sheet (300) is located between the first limiting portion (710) and the second limiting portion (720).

6. The battery case according to any one of claims 1 to 3, characterized in that: Also includes a second insulating sheet (800); The second insulating sheet (800) is arranged between the pole (400) and the housing (100); the pole (400) and the housing (100) are insulated by the second insulating sheet (800); and the pole (400) passes through the second insulating sheet (800).

7. The battery case according to any one of claims 1 to 3, characterized in that: The housing (100) further comprises a cover plate (130) and a bottom plate (120); The cover plate (130) and the bottom plate (120) are respectively located on both sides of the side wall structure (110) in the thickness direction of the shell (100); the cover plate (130) and the bottom plate (120) are connected to the side wall structure (110); the cover plate (130), the bottom plate (120) and the side wall structure (110) are arranged to form an inner cavity of the shell (100); A surface of at least one corner of the cover plate (130) is provided with a pressure relief groove (131).

8. A battery, characterized in that: Comprising a battery cell (200) and a battery shell as claimed in any one of claims 1 to 7; The battery cell (200) is arranged in the outer shell (100) of the battery shell; The battery cell (200) comprises a pole lug end (210), wherein the pole lug end (210) is provided with a first pole lug (211) and a second pole lug (212); The first side wall (111) of the battery shell is opposite to the tab end (210); The first connecting piece (300) of the battery shell is located at one end of the first side wall (111) and is connected to the first electrode tab (211).

9. The battery according to claim 8, characterized in that The electrode (400) of the battery shell comprises a columnar portion (410) and a connecting portion (420) located outside the second side wall (112) of the battery shell; An angle a is formed between the extension direction of the columnar portion (410) and the extension direction of the first electrode tab (211), and the angle is 30°≤a≤100°.

10. The battery according to claim 8, characterized in that The end of the first connecting piece (300) connected to the first pole ear (211) and the end of the first connecting piece (300) connected to the pole (400) of the battery shell are respectively located on different sides of the battery cell (200).

11. The battery according to claim 8, characterized in that Also includes a pressure relief sealing cover (500); The first side wall (111) has a second through hole (117), the pressure relief sealing cover (500) is connected to the outer surface of the first side wall (111), and the pressure relief sealing cover (500) covers the second through hole (117); The pressure relief sealing cover (500) comprises a fixing ring (510), a sealing cover (520) and a glue layer (530); The fixing ring (510) is fixedly connected to the outer surface of the first side wall (111), and the fixing ring (510) has a communicating hole (511), and the communicating hole (511) is connected to the second through hole (117); The sealing cover (520) is bonded to a side of the fixing ring (510) away from the first side wall (111) via the adhesive layer (530), and the sealing cover (520) covers the communicating hole (511).

12. The battery according to claim 11, characterized in that The sealing cover (520) comprises a cover connection portion (521) and a protruding portion (522); The cover connection portion (521) covers the side of the fixing ring (510) away from the first side wall (111), the protrusion (522) is arranged on the side of the cover connection portion (521) facing the first side wall (111), the protrusion (522) is penetrated in the connecting hole (511), the adhesive layer (530) includes a bent portion bent in a direction close to the battery core (200), and the cover connection portion (521) is bonded to the side of the fixing ring (510) away from the first side wall (111) through the adhesive layer (530).

13. The battery according to claim 11, characterized in that The opening area of ​​the second through hole (117) is greater than 1.2 times the opening area of ​​the connecting hole (511).

14. The battery according to claim 11, characterized in that The fixing ring (510) comprises a bonding portion (512), the bonding portion (512) being bonded to the sealing cover (520) via the adhesive layer (530), and the distance between the outer edge of the bonding portion (512) and the edge of the connecting hole (511) is greater than 0.5 mm.

15. The battery according to claim 11, characterized in that A projection of the first connecting sheet (300) in the first direction does not overlap with a projection of the second through hole (117) in the first direction.

16. The battery according to any one of claims 8 to 15, characterized in that: It also includes a second connecting piece (600), wherein the second connecting piece (600) is fixedly connected to the outer surface of the second side wall (112) of the battery shell; The second pole tab (212) is connected to the first side wall (111), and the second pole tab (212) is electrically connected to the second connecting piece (600) through the housing (100).

17. The battery according to any one of claims 8 to 15, characterized in that: The battery cell (200) comprises a first sub-portion (221) and a second sub-portion (222), wherein the first sub-portion (221) and the second sub-portion (222) are both opposite to the second side wall (112) of the battery shell; The portion of the first connecting piece (300) located on the second side wall (112) is arranged between the first sub-portion (221) and the second side wall (112), and the distance between the edge of the first sub-portion (221) on the side close to the second side wall (112) and the second side wall (112) is greater than the distance between the edge of the second sub-portion (222) on the side close to the second side wall (112) and the second side wall (112).

18. The battery according to claim 17, characterized in that It also includes a second connecting piece (600), wherein the second connecting piece (600) is fixedly connected to the outer surface of the second side wall (112); A projection of the second connecting piece (600) in the second direction does not overlap with a projection of the first sub-portion (221) in the second direction.

19. The battery according to any one of claims 8 to 15, characterized in that: It also includes a third insulating sheet, which is arranged between the first connecting sheet (300) and the battery core (200), and the first connecting sheet (300) and the battery core (200) are insulated by the third insulating sheet.

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