Battery cell and battery

Abstract

The utility model relates to the technical field of energy storage, and provides a battery cell and a battery. The battery cell comprises a body, a tab and a connecting piece, the body comprises a plurality of current collectors which are sequentially stacked along a first direction; the current collector is provided with a supporting layer and two conducting layers, and the two conducting layers are arranged on the two opposite sides of the supporting layer in the first direction; each current collector is provided with a tab connecting part protruding out of the edge of the current collector in the second direction. And along the stacking direction of the tab connecting parts, the connecting piece penetrates through and is electrically conducted with the tab connecting parts. And the tab is connected and electrically conducted with the tab connecting part through the connecting piece. At least part of the tab connecting part is bent relative to the body; the second direction intersects the first direction. Through the structural arrangement, the space ratio of the battery cell is reduced, and the energy density of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery cell and a battery. Background Art

[0002] With the continuous development of battery technology, most manufacturers improve the battery's nail penetration performance and impact resistance by changing the battery's structure.

[0003] In the related art, the battery cell uses a composite current collector instead of a traditional metal foil current collector. The composite current collector needs to be connected with a metal foil to make the metal layer of the composite current collector conductive, and then welded to the tab to complete the cell packaging.

[0004] However, the transferred metal foil and the welded part between the metal foil and the tab will occupy the space of the battery. It is difficult to reduce the overall space occupied by the battery and increase the energy density. Utility Model Content

[0005] The present application provides a battery cell and a battery that can reduce space occupancy and increase energy density.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a battery cell, comprising:

[0008] A body, the body comprising a plurality of current collectors stacked in sequence along a first direction; the current collectors comprising a support layer and two conductive layers, the two conductive layers being arranged on opposite sides of the support layer along the first direction; each of the current collectors comprising a tab connection portion protruding from an edge of the current collector along a second direction;

[0009] A connecting piece, along the stacking direction of the tab connecting parts, the connecting piece penetrates and electrically connects the tab connecting parts;

[0010] A tab, wherein the tab is connected to each of the tab connecting parts through the connecting piece and is electrically conductive;

[0011] Wherein, at least part of the tab connection portion is bent relative to the body;

[0012] The second direction intersects the first direction.

[0013] As a possible implementation manner, the tab connection portion includes a first tab connection segment and a second tab connection segment, the first tab connection segment is bent relative to the body, and the second tab connection segment and the body are opposite to each other along the second direction;

[0014] The connecting member passes through the second tab connecting section along the second direction.

[0015] As a possible implementation manner, the pole tab includes a first pole tab segment, and the first pole tab segment and the second pole tab connecting segment are overlapped and arranged along the second direction, and are connected to the second pole tab connecting segment through the connecting member.

[0016] As a possible implementation manner, the first pole lug segment is bent relative to the second pole lug connecting segment to form the second pole lug segment;

[0017] The second pole lug segment extends along a second direction toward a side away from the body.

[0018] As a possible implementation manner, the current collector further includes an active material layer and an insulating layer, and the active material layer and the insulating layer are arranged on a side of each of the conductive layers away from the support layer;

[0019] On each of the conductive layers, the insulating layer and the active material layer are in contact with each other, and the insulating layer is located on a side of the conductive layer close to the tab connection portion.

[0020] As a possible implementation manner, part of the insulating layer covers a side of the tab connecting portion close to the conductive layer.

[0021] As a possible implementation manner, the connecting member includes a stopper and a protruding portion, and the protruding portion is arranged through each of the tab connecting portions along the second direction;

[0022] The stopper portion and the tab are respectively located at two ends of the protruding portion along the second direction.

[0023] As a possible implementation manner, along the second direction, the stopper is located on a side opposite to the tab connection portion and the body, and is connected to the tab connection portion;

[0024] The pole lug is connected to a side of the pole lug connecting portion facing away from the stopper.

[0025] As a possible implementation manner, the battery core further includes an insulating member, and the tab and the protrusion are welded to form a welding area;

[0026] The insulating member is disposed on at least one side of the tab connection portion along the stacking direction of the tab connection portion;

[0027] Along the second direction, an orthographic projection of the stop portion on the plane where the insulating member is located is covered by the insulating member.

[0028] As a possible implementation manner, the body has a first end surface, and the first end surface faces the tab connection portion along a second direction;

[0029] The positive projection of the tab connection portion on the plane where the first end face is located is covered by the first end face.

[0030] As a possible implementation manner, the plane where the second tab connection segment is located intersects with the plane where the body is located and has a first included angle; the first included angle is greater than or equal to 30° and less than or equal to 90°; and / or,

[0031] The plane where the second tab segment is located intersects with the plane where the second tab connection segment is located and has a second included angle; the second included angle is greater than or equal to 45° and less than or equal to 135°.

[0032] As a possible implementation manner, the tensile strength between the stop portion and the tab connection portion is ≥0.2 N / mm; and / or;

[0033] The tensile strength between the tab and the tab connection portion is ≥0.2 N / mm.

[0034] As a possible implementation manner, the ratio of the area of the welding zone to the area of the second tab connection segment is 0.3 - 0.8.

[0035] The battery cell provided by the present application, through such a multi-layer structure of the current collector, improves the mechanical strength of the battery cell, thereby contributing to improving the needle-punching safety of the battery cell. At the same time, it can also reduce the internal resistance of the battery cell to improve the energy efficiency and power density of the battery cell. In addition, each tab connection portion of the current collector is connected to the tab through a connecting member, realizing the electrical connection within the battery cell. The tab connection portion is bent relative to the body, which can reduce the overall space occupation ratio of the battery cell and is beneficial to improving the energy density of the battery cell.

[0036] In a second aspect, the present application provides a battery, including: a packaging member and the battery cell described in the first aspect;

[0037] The packaging member packages the battery cell.

[0038] The battery provided by the present application can improve the energy density because it includes the battery cell provided in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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 following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 Schematic diagram of the battery cell provided by the embodiment of the present application Figure 1 ;

[0041] Figure 2 Schematic diagram of the current collector in the battery cell provided by the embodiment of the present application Figure 1 ;

[0042] Figure 3 Schematic diagram of the current collector in the battery cell provided by the embodiment of the present application Figure 2 ;

[0043] Figure 4 Schematic diagram of the lamination of the current collector in the battery cell provided by the embodiment of the present application;

[0044] Figure 5 Schematic diagram of the winding of the current collector in the battery cell provided by the embodiment of the present application;

[0045] Figure 6 Schematic diagram of the battery cell provided by the embodiment of the present application Figure 2 ;

[0046] Figure 7 Schematic diagram of the connecting member in the battery cell provided by the embodiment of the present application;

[0047] Figure 8 Schematic diagram of the battery cell provided by the embodiment of the present application Figure 3 ;

[0048] Figure 9 Schematic diagram of the battery provided by the embodiment of the present application.

[0049] Description of the reference numerals:

[0050] 100 - battery cell;

[0051] 110 - body;

[0052] 111 - current collector;

[0053] 112 - support layer;

[0054] 113 - conductive layer;

[0055] 114 - tab connection part; 1141 - first tab connection segment; 1142 - second tab connection segment;

[0056] 115 - active material layer;

[0057] 116 - insulating layer;

[0058] 117 - first end face;

[0059] 120 - tab; 121 - first tab segment; 122 - second tab segment;

[0060] 130 - connecting member; 131 - stop portion; 132 - protruding portion;

[0061] 140-insulating parts;

[0062] 200-battery;

[0063] 210-Packaging. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0065] With the continuous development of battery technology, most manufacturers improve the battery's nail penetration performance and impact resistance by changing the battery's structure.

[0066] In the related art, the battery cell uses a composite current collector instead of a traditional metal foil current collector. The composite current collector needs to be connected with a metal foil to make the metal layer of the composite current collector conductive, and then welded to the tab to complete the cell packaging.

[0067] However, the transferred metal foil and the welded part between the metal foil and the tab will occupy the space of the battery. It is difficult to reduce the overall space occupied by the battery and increase the energy density.

[0068] In order to overcome the defects in the prior art, the present application provides a battery cell and a battery. The battery cell includes a body, a pole lug and a connector. The body includes a plurality of composite current collectors, the composite current collectors have a pole lug connection portion, and the connector is arranged through and electrically connects each pole lug connection portion. The pole lug is connected and electrically connected through the connector and the pole lug connection portion. At least part of the pole lug connection portion is bent relative to the body. Through such a structural arrangement, the structural size of the battery cell is reduced, and the space occupied by the battery cell is reduced, so as to improve the energy density of the battery cell.

[0069] The contents of the present application will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present application more clearly and in detail.

[0070] Figure 1 Schematic diagram of the battery cell provided in the embodiment of the present application Figure 1 . Figure 2 Schematic diagram of the current collector in the battery cell provided in the embodiment of the present application Figure 1 . Figure 3 Schematic diagram of the current collector in the battery cell provided in the embodiment of the present application Figure 2 .Figure 4 Schematic diagram of the current collector layer stack in the battery cell provided by the embodiment of the present application. Figure 5 Schematic diagram of the winding of the current collector in the battery cell provided by the embodiment of the present application. Figure 6 Schematic of the battery cell provided by the embodiment of the present application Figure 2 。 Figure 7 Schematic diagram of the connecting member in the battery cell provided by the embodiment of the present application.

[0071] As Figures 1-6 As shown, the present application provides a battery cell 100, including: a body 110, tab 120 and a connecting member 130.

[0072] The body 110 includes a plurality of current collectors 111 stacked in sequence along a first direction; the current collector 111 has a support layer 112 and two conductive layers 113, and the two conductive layers 113 are disposed on opposite sides of the support layer 112 along the first direction; each current collector 111 has a tab connection portion 114 protruding from the edge of the current collector 111 along a second direction.

[0073] Along the stacking direction of the tab connection portions 114, the connecting member 130 penetrates and electrically conducts each tab connection portion 114.

[0074] The tab 120 is connected and electrically conducted through the connecting member 130 and the tab connection portion 114.

[0075] At least a part of the tab connection portions 114 are bent relative to the body 110; the second direction intersects the first direction.

[0076] According to the battery cell 100 provided by the embodiment of the present application, through such a multi-layer structure of the current collector 111, the mechanical strength of the battery cell 100 is improved, which helps to improve the needle puncture safety of the battery cell 100. At the same time, the internal resistance of the battery cell 100 can also be reduced to improve the energy efficiency and power density of the battery cell 100. In addition, each tab connection portion 114 of the current collector 111 is connected to the tab 120 through the connecting member 130, realizing the circuit connection inside the battery cell 100. The tab connection portion 114 is bent relative to the body 110, which can reduce the overall space occupation ratio of the battery cell 100, and is beneficial to improving the energy density of the battery cell 100.

[0077] The following will separately describe in detail the specific structure of the battery cell 100 and various possible implementation manners.

[0078] It should be noted that the present application may define the first direction as the P direction and the second direction as the Q direction. In some specific implementation manners, the P direction may be the thickness direction of the battery cell 100, and the Q direction may be the width direction or the length direction of the battery cell 100.

[0079] It is not difficult to understand that in this application, multiple current collectors 111 are stacked in sequence along the P direction, and a separator is provided between adjacent current collectors 111 to prevent adjacent current collectors 111 from contacting and forming a short circuit.

[0080] Exemplarily, the current collector 111 in this embodiment includes a support layer 112 and two conductive layers 113. The two conductive layers 113 are arranged on opposite sides of the support layer 112 along the Z direction, and the conductive layer 113 and the support layer 112 are fixedly connected. Compared with common current collectors 111, such a current collector 111 can improve the structural strength of the current collector 111 and the needle-punching safety of the battery cell 100 through the setting of a multi-layer structure. Due to the setting of the support layer 112 between adjacent conductive layers 113, adjacent conductive layers 113 are not electrically connected to each other, which can reduce the internal resistance and improve the energy density and working density of the battery cell 100.

[0081] It can be understood that when the current collector 111 is a positive current collector 111, the materials of the two conductive layers 113 are the same, and aluminum, nickel, etc. can be selected; when the current collector 111 is a negative current collector 111, the materials of the two conductive layers 113 are the same, and copper, etc. can be selected. The support layer 112 can be selected from polyimide (PI), polypropylene (PP), polyethylene terephthalate (PET), etc. No specific requirements are made for the specific selection and mutual combination of the support layer 112 and the conductive layer 113 in this part.

[0082] Furthermore, the current collector 111 has an ear connection portion 114, and the ear connection portion 114 protrudes along the Q direction from one side edge of the current collector 111. In this way, when the battery cell 100 is wound or laminated, the ear connection portions 114 of each current collector 111 are stacked along the P direction. The connecting member 130 is inserted through each ear connection portion 114 along the stacking direction of the ear connection portions 114 to electrically connect each ear connection portion 114, that is, adjacent current collectors 111 are electrically connected to each other.

[0083] Combined Figure 4 and Figure 5 , each current collector 111 is laminated or wound, and the ear connection portion 114 of the positive current collector 111 is electrically connected through the connecting member 130, and the ear connection portion 114 of the negative current collector 111 is electrically connected through the connecting member 130.

[0084] The ear connection portion 114 is bent relative to the body 110, which can reduce the space occupation ratio of the protruding part of the ear connection portion 114 relative to the body 110, thereby reducing the overall space occupation ratio of the battery cell 100 and being beneficial to improving the energy density of the battery cell 100. At the same time, it also helps with the miniaturization of the battery cell 100.

[0085] Possibly, the tab connection part 114 includes a first tab connection segment 1141 and a second tab connection segment 1142. The first tab connection segment 1141 is bent relative to the body 110, and the second tab connection segment 1142 and the body 110 are opposite to each other in the second direction; the connecting member 130 penetrates through the second tab connection segment 1142 in the second direction. In this way, after the tab connection part 114 is bent, the second tab connection end and the body 110 are opposite to each other in the second direction, reducing the structural size in the Q direction, thereby reducing the overall space occupation ratio of the battery cell 100, which is beneficial to improving the energy density of the battery cell 100.

[0086] Figure 8 Schematic diagram of the battery cell provided by the embodiment of the present application Figure 3 。

[0087] Combined with Figure 1 、 Figure 6 and Figure 8 It can be understood that the tab connection parts 114 of the current collectors 111 are stacked in the P direction, and the first tab connection segment 1141 is bent relative to the body 110, so as to reduce the gap between the tab connection parts 114 of the current collectors 111 and make the structure of the battery cell 100 more compact. After the first tab connection segment 1141 is bent relative to the body 110, the second tab connection segment 1142 and the body 110 are opposite to each other in the Q direction.

[0088] It can be understood that when the second tab connection segment 1142 and the body 110 are opposite to each other, there is a first included angle (α) between the plane where the second tab connection segment 1142 is located and the plane where the body 110 is located. That is to say, the second tab connection segment 1142 can be inclined relative to the body 110. The present embodiment does not specifically limit the angle of the first included angle (α).

[0089] Wherein, the connecting member 130 penetrates through the second tab connection segments 1142 of the tab connection parts 114, so that the current collectors 111 are electrically connected to each other.

[0090] As a possible implementation manner, the tab 120 includes a first tab segment 121. The first tab segment 121 and the second tab connection segment 1142 are overlapped in the second direction and are connected to the second tab connection segment 1142 through the connecting member 130. In this way, the stability of the connection and electrical conduction between the tab 120 and the tab connection part 114 through the connecting member 130 can be improved.

[0091] Combined with Figure 1 、 Figure 4 、 Figure 5 and Figure 6In the actual production process of the battery cell 100, the current collectors 111 are first stacked along the P direction, the corresponding tab connectors 114 are stacked along the P direction, and the connector 130 penetrates the tab connector 114 along the P direction to achieve electrical conduction of the current collectors 111. The connector 130 penetrates the second tab connector segment 1142 of the tab connector 114 and is connected to the first tab segment 121, thereby achieving electrical conduction between the first tab segment 121 and the current collector 111.

[0092] The first tab connection segment 1141 is bent relative to the body 110, and the second tab connection segment 1142 is opposite to the body 110, so that the space occupied by the battery 200 is reduced, which helps to improve the energy density of the battery 200. At the same time, the first tab connection segment 1141 is bent to prevent the connection between the connector 130, the second tab connection segment 1142 and the first tab segment 121 from being disconnected due to bending force, which can improve the connection stability of the battery cell 100.

[0093] Possibly, the first pole lug segment 121 is bent relative to the second pole lug connecting segment 1142 to form a second pole lug segment 122; the second pole lug segment 122 extends along the second direction toward the side away from the body 110. In this way, the structural dimensions of the battery cell 100 along the P direction are reduced, the space occupied is reduced, and at the same time, the subsequent packaging of the battery cell 100 is facilitated.

[0094] It should be noted that the second pole lug segment 122 in this embodiment extends as a whole along the Q direction. The second pole lug segment 122 and the second pole lug connecting segment 1142 are arranged obliquely or perpendicularly, that is, a second angle (β) is formed between the plane where the second pole lug segment 122 is located and the plane where the second pole lug connecting segment 1142 is located. This section does not make specific requirements on the range of the second angle (β).

[0095] It can be understood that the current collector 111 further includes an active material layer 115 and an insulating layer 116, which are disposed on the side of each conductive layer 113 away from the support layer 112; on each conductive layer 113, the insulating layer 116 and the active material layer 115 are in contact, and the insulating layer 116 is located on the side of the conductive layer 113 close to the tab connection portion 114. In this way, the current collector 111 is covered with different active material layers 115 to form different positive and negative electrode sheets.

[0096] When the current collector 111 is used as a positive electrode, the active material layer 115 covered by the current collector 111 is a positive electrode active material, such as: lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, nickel cobalt manganese ternary material and nickel cobalt aluminum oxide; when the current collector 111 is used as a negative electrode sheet, the active material layer 115 covered by the current collector 111 is a negative electrode active material, such as: natural graphite, artificial graphite, soft carbon, hard carbon, lithium titanate, silicon-carbon composite materials, etc.

[0097] The active material layer 115 and the insulating layer 116 can be connected to the two conductive layers 113 corresponding to the current collector 111 by coating. During the production process of the battery cell 100, coating is performed on the side of the two conductive layers 113 of the current collector 111 along the P direction that is away from the support layer 112 at preset positions, and then after rolling and slitting, the current collector 111 coated with the active material layer 115 and the insulating layer 116 can be obtained.

[0098] On each conductive layer 113, the insulating layer 116 is in contact with the active material layer 115, and the insulating layer 116 is located on the side of the conductive layer 113 close to the tab connection part 114, preventing adjacent current collectors 111 from being short-circuited, and both the insulation and safety of the battery cell 100 are improved.

[0099] Possibly, in combination with Figures 1-3 , Figure 6 , the insulating layer 116 covers the side of the tab connection part 114 close to the conductive layer 113. In this way, it can prevent the adjacent current collectors 111 from contacting each other and causing an internal short circuit in the battery cell 100 after the access connection part pierces the separator, thereby improving the safety of the battery cell 100.

[0100] Possibly, the connecting member 130 includes a stop portion 131 and a protruding portion 132, and the protruding portion 132 penetrates through each tab connection part 114 along the second direction; the stop portion 131 and the tab 120 are respectively located at both ends of the protruding portion 132 along the second direction. Such a connecting member 130 is convenient for connecting with the tab connection part 114 and can improve the production efficiency of the battery cell 100.

[0101] Exemplarily, the stop portion 131 and the protruding portion 132 can be an integral independent conductive member, with the protruding portion 132 connected to one side of the stop portion 131. During the actual production process, the protruding portion 132 can pierce through each tab connection part 114 along the Q direction, and each tab connection part 114 realizes the mutual electrical conduction between the current collectors 111 through the protruding portion 132. Such a connection method is convenient for operation, simplifies the welding operation between the tab connection parts 114, thereby improving the production efficiency of the battery cell 100 and reducing the production cost.

[0102] The stop portion 131 stops at one side of the tab connection part 114 along the Q direction, and the tab 120 is connected to the side of the protruding portion 132 away from the stop portion 131, so as to relatively stably connect the connecting member 130, the tab connection part 114, and the tab 120, and improve the connection stability between the components of the battery cell 100.

[0103] Possibly, along the second direction, the stop portion 131 is located on the opposite side of the tab connection portion 114 and the body 110, and is connected to the tab connection portion 114; the tab 120 is connected to the side of the tab connection portion 114 away from the stop portion 131. In this way, the contact area between the tab connection portion 114 and the tab 120 can be reduced, preventing heat concentration caused by current collection. At the same time, the tab 120 is located on the side of the tab connection portion 114 away from the stop portion 131, facilitating the connection between the tab 120, the tab connection portion 114 and the connecting member 130, which is beneficial to improving the production efficiency of the battery cell 100 and also facilitating the encapsulation after the battery cell 100 is formed, further improving the production efficiency of the battery 200.

[0104] Specifically, the tab 120 is welded to the protrusion 132 to form a welding area. Exemplarily, the tab 120 and the protrusion 132 can be connected by resistance welding, and a weld mark will be formed on the tab 120 and the protrusion 132 after welding, and the welded part is the welding area.

[0105] The battery cell 100 further includes an insulating member 140, which is disposed on at least one side of the tab connection portion 114 along the stacking direction of the tab connection portion 114; along the second direction, the orthographic projection of the stop portion 131 on the plane where the insulating member 140 is located is covered by the insulating member 140. In this way, through the setting of the insulating member 140, it is possible to prevent the burrs on the connecting member 130 from piercing the separator, so as to avoid internal short circuit of the battery cell 100 and improve the safety of the battery cell 100.

[0106] It can be understood that, as Figure 8 shown, the insulating member 140 can be disposed between the first tab connection segment 1141 and the body 110 along the stacking direction of the tab connection portion 114. In this way, along the Q direction, the orthographic projection of the stop portion 131 of the connecting member 130 on the plane where the insulating member 140 is located is covered by the insulating member 140, thereby protecting the current collector 111 and preventing the burrs on the connecting member 130 from piercing the separator to form a short circuit.

[0107] The insulating member 140 can also be disposed on the side of the tab connection portion 114 away from the connecting member 130 to form an insulating protection on the side of the tab 120 away from the tab connection portion 114, preventing the burrs on the tab 120 from piercing the encapsulation member 210 and short-circuiting with the encapsulation member 210 during the encapsulation process of the battery cell 100, and improving the safety of the battery 200.

[0108] Furthermore, the ratio of the area of the welding area to the area of the second tab connection segment 1142 is 0.3 - 0.8. In this way, through the setting of the area of the welding area, the welding strength between the connecting member 130, the tab 120 and the tab connection portion 114 is ensured, and at the same time, over-welding of the welding area is prevented from causing rupture of the tab connection portion 114.

[0109] Exemplarily, the ratio of the area of the welding region to the area of the second tab connecting section 1142 may be 0.3, 0.4, 0.58, 0.625, 0.7, 0.76, 0.8, etc. This embodiment does not make specific requirements in this regard, and the ratio of the area of the welding region to the area of the second tab connecting section 1142 within the above range is sufficient.

[0110] Possibly, in the battery cell 100 provided by the present application, the tensile strength between the stopping portion 131 and the tab connecting portion 114 is ≥ 0.2 N / mm; and / or; the tensile strength between the tab 120 and the tab connecting portion 114 is ≥ 0.2 N / mm. In this way, to ensure the connection strength between the tab connecting portion 114, the tab 120, and the connecting member 130, and prevent the disconnection between the tab connecting portion 114, the tab 120, and the connecting member 130 during the forming process of the battery cell 100, thereby improving the structural strength and stability of the battery cell 100.

[0111] It is not difficult to understand that the tensile strength between the stopping portion 131 and the tab connecting portion 114 may be 0.2 N / mm, 0.43 N / mm, 0.5 N / mm, 0.77 N / mm, 0.8 N / mm, etc.; the tensile strength between the tab 120 and the tab connecting portion 114 may be 0.2 N / mm, 0.43 N / mm, 0.5 N / mm, 0.77 N / mm, 0.8 N / mm, etc.

[0112] In a possible implementation manner, the body 110 has a first end face 117, and the first end face 117 faces the tab connecting portion 114 along the second direction; the orthographic projection of the tab connecting portion 114 on the plane where the first end face 117 is located is covered by the first end face 117. In this way, the tab connecting portion 114 is located within the first end face 117 in both the P direction and the Q direction, so as to reduce the structural size after the tab connecting portion 114 is bent, reduce the overall space occupation ratio of the battery cell 100, and facilitate improving the energy density of the battery cell 100.

[0113] Combined with the foregoing embodiments, the plane where the second tab connecting section 1142 is located intersects with the plane where the body 110 is located and has a first included angle (α); the first included angle is greater than or equal to 30° and less than or equal to 90°; and / or, the plane where the second tab section 122 is located intersects with the plane where the second tab connecting section 1142 is located and has a second included angle (β); the second included angle is greater than or equal to 45° and less than or equal to 135°.

[0114] Exemplarily, the first included angle may be 30°, 45°, 68°, 72°, 80°, 85°, 90°, etc., and the second included angle may be 45°, 60°, 70°, 90°, 120°, 135°, etc. This part does not make specific requirements.

[0115] The battery cell 100 provided by the present application includes: a body 110, tab ears 120, and a connecting member 130. The body 110 includes a plurality of current collectors 111 stacked in sequence along a first direction; the current collector 111 has a support layer 112 and two conductive layers 113, and the two conductive layers 113 are disposed on opposite sides of the support layer 112 along the first direction; each current collector 111 has a tab connection portion 114 protruding from the edge of the current collector 111 along a second direction. Along the stacking direction of the tab connection portions 114, the connecting member 130 penetrates and electrically conducts each tab connection portion 114. The tab ears 120 are connected and electrically conducted through the connecting member 130 and the tab connection portions 114. At least a part of the tab connection portions 114 is bent relative to the body 110; the second direction intersects the first direction. Through such a structural arrangement, the space occupation ratio of the battery cell 100 is reduced, and the energy density of the battery cell 100 is improved.

[0116] Figure 9 It is a schematic diagram of the battery provided by the embodiment of the present application.

[0117] In addition, as Figure 9 shown, the present application can also provide a battery 200, including: a packaging member 210 and the battery cell 100 in any of the foregoing embodiments; the packaging member 210 packages the battery cell 100.

[0118] It should be noted that the packaging member 210 can be a packaging film or a housing, etc. The battery 200 formed in this way can be a soft-pack battery 200 or a housing battery 200, etc. The cross-sectional shape of the housing battery 200 can be square, circular, or polygonal, etc.

[0119] In this way, the battery 200 provided by the present application can improve the energy density because it includes the battery cell 100 in any of the foregoing embodiments.

[0120] Furthermore, the present application can also provide an electrical device, including: an electrical device and the battery 200 in the foregoing embodiments; the electrical device is electrically connected to the battery 200.

[0121] In this way, the electrical device provided by the present application can improve the energy density because it includes the battery cell 100 in the foregoing embodiments.

[0122] It should be noted that the electrical device in this embodiment can be a mobile terminal, an electric vehicle, etc., and no specific requirements are made in this regard.

[0123] It should be noted that phrases such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining a specific feature, structure or characteristic with an embodiment, it is within the knowledge scope of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0124] Generally speaking, terms should be understood at least in part based on their usage in context. For example, at least in part according to the context, the term "one or more" used in the text can be used to describe any feature, structure or characteristic in a singular sense, or can be used to describe a combination of features, structures or characteristics in a plural sense. Similarly, at least in part according to the context, terms such as "a" or "the" can also be understood to convey a singular usage or a plural usage.

[0125] It should be easily understood that the terms "on", "above", and "over" in this application should be interpreted in the broadest manner, so that "on" not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over something", but can also include the meaning of "above" or "over something" without intermediate features or layers therebetween (i.e., directly on something).

[0126] In addition, for the convenience of description, spatial relative terms such as "below", "beneath", "under", "above", "over" etc. may be used in the text to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatial relative terms are intended to include different orientations of the device in use or operation other than the orientation shown in the drawings. The device may have other orientations (rotated 90° or in other orientations), and the spatial relative descriptive terms used in the text can be interpreted accordingly.

[0127] 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 on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell (100), characterized in that: include: A body (110), wherein the body (110) comprises a plurality of current collectors (111) stacked in sequence along a first direction; The current collector (111) comprises a support layer (112) and two conductive layers (113), wherein the two conductive layers (113) are arranged on opposite sides of the support layer (112) along the first direction; each current collector (111) comprises a tab connection portion (114) protruding from an edge of the current collector (111) along the second direction; A connecting piece (130), along the stacking direction of the pole lug connecting parts (114), the connecting piece (130) penetrates and electrically connects the pole lug connecting parts (114); A pole lug (120), the pole lug (120) being connected to each of the pole lug connecting portions (114) through the connecting member (130) and being electrically conductive; Wherein, at least a portion of the tab connection portion (114) is bent relative to the body (110); The second direction intersects the first direction.

2. The battery cell (100) according to claim 1, characterized in that: The pole tab connection portion (114) comprises a first pole tab connection segment (1141) and a second pole tab connection segment (1142), the first pole tab connection segment (1141) is bent relative to the body (110), and the second pole tab connection segment (1142) and the body (110) are opposite to each other along the second direction; The connecting member (130) is provided with the second pole lug connecting section (1142) along the second direction.

3. The battery cell (100) according to claim 2, characterized in that: The pole lug (120) comprises a first pole lug segment (121), wherein the first pole lug segment (121) and the second pole lug connecting segment (1142) are overlapped and arranged along the second direction, and are connected via the connecting member (130) and the second pole lug connecting segment (1142).

4. The battery cell (100) according to claim 3, characterized in that: The first pole lug segment (121) is bent relative to the second pole lug connecting segment (1142) to form a second pole lug segment (122); The second pole lug segment (122) extends along a second direction toward a side away from the body (110).

5. The battery cell (100) according to any one of claims 1 to 4, characterized in that: The current collector (111) further comprises an active material layer (115) and an insulating layer (116), wherein the active material layer (115) and the insulating layer (116) are arranged on a side of each conductive layer (113) away from the supporting layer (112); On each of the conductive layers (113), the insulating layer (116) and the active material layer (115) are in contact with each other, and the insulating layer (116) is located on a side of the conductive layer (113) close to the tab connection portion (114).

6. The battery cell (100) according to claim 5, characterized in that: A portion of the insulating layer (116) covers a side of the tab connecting portion (114) close to the conductive layer (113).

7. The battery cell (100) according to any one of claims 2 to 4, characterized in that: The connecting member (130) comprises a stopper portion (131) and a protruding portion (132), wherein the protruding portion (132) is arranged along the second direction through each of the tab connecting portions (114); The stopper portion (131) and the pole lug (120) are respectively located at two ends of the protruding portion (132) along the second direction.

8. The battery cell (100) according to claim 7, characterized in that: Along the second direction, the stopper (131) is located on a side opposite to the tab connection portion (114) and the body (110), and is connected to the tab connection portion (114); The pole lug (120) is connected to a side of the pole lug connecting portion (114) facing away from the stop portion (131).

9. The battery cell (100) according to claim 8, characterized in that: It also includes an insulating member (140); the pole ear (120) and the protruding portion (132) are welded to form a welding area; The insulating member (140) is arranged on at least one side of the pole tab connection portion (114) along the stacking direction of the pole tab connection portion (114); Along the second direction, the orthographic projection of the stop portion (131) on the plane where the insulating member (140) is located is covered by the insulating member (140).

10. The battery cell (100) according to any one of claims 1 to 4, characterized in that: The body (110) has a first end surface (117), and the first end surface (117) faces the tab connection portion (114) along a second direction; The orthographic projection of the pole tab connection portion (114) on the surface where the first end surface (117) is located is covered by the first end surface (117).

11. The battery cell (100) according to claim 4, characterized in that: The plane where the second tab connection section (1142) is located intersects with the plane where the body (110) is located and has a first angle; the first angle is greater than or equal to 30° and less than or equal to 90°; and / or, The plane where the second pole lug segment (122) is located intersects with the plane where the second pole lug connecting segment (1142) is located and has a second angle; the second angle is greater than or equal to 45° and less than or equal to 135°.

12. The battery cell (100) according to claim 7, characterized in that: The tensile strength between the stopper (131) and the tab connection portion (114) is ≥ 0.2 N / mm; and / or; The tensile strength between the pole tab (120) and the pole tab connecting portion (114) is ≥0.2 N / mm.

13. The battery cell (100) according to claim 9, characterized in that: The ratio of the area of ​​the welding zone to the area of ​​the second tab connecting section (1142) is 0.3-0.

8.

14. A battery (200), characterized in that: include: A packaging component (210) and a battery cell (100) as claimed in any one of claims 1 to 13; The packaging component (210) packages the battery core (100).

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