Battery pack and electric equipment

Abstract

The invention provides a battery pack (100) and electric equipment with the battery pack (100). The battery pack (100) comprises a battery core assembly (10) and a connecting piece (20), the battery cell assembly (10) comprises M battery cells (11) stacked along a first direction (X). Each battery cell (11) comprises a battery cell shell (111), an electrode terminal (113) and an electrode assembly (112) arranged in the battery cell shell (111); the connecting piece (20) comprises N conducting strips (23) which are arranged at intervals. The electrode terminal (113) is connected to the conductive sheet (23). The electrode terminals (113) of the adjacent battery cells (11) are not overlapped in the first direction (X), so that the risk of short circuit of the adjacent electrode terminals (113) is reduced. And the electrode terminal (113) is connected with the electrode assembly (112) and extends out of the battery core shell (111). And along the first direction (X), the projection of the part of the electrode terminal (113) of any battery cell (11) outside the battery cell shell (111) is separated from the projection of the part of the electrode terminal (113) of the adjacent battery cell (11) outside the battery cell shell (111) in the second direction (Y). And the second direction (Y) is perpendicular to the first direction (X), so that the electrode terminal (113) can be conveniently connected with other conductive parts.

Description

Battery packs and powered devices Technical Field

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

[0002] The battery cells of a battery pack are usually stacked, and the electrode terminals of each battery cell overlap in the stacking direction, resulting in a small welding space. The electrode terminals of the stacked battery cells are close to each other, which is not conducive to the connection of the electrode terminals.

[0003] Summary of the Invention

[0004] In view of this, it is necessary to provide a battery pack and an electrical device that can facilitate the connection of electrode terminals.

[0005] An embodiment of the present application provides a battery pack comprising a cell assembly and a connector. The cell assembly comprises M cells stacked along a first direction. Each cell comprises a cell shell, an electrode terminal and an electrode assembly disposed in the cell shell. The electrode terminal connects the electrode assembly and extends from the cell shell. Along the first direction, the projection of the portion of the electrode terminal of any cell located outside the cell shell is separated from the projection of the portion of the electrode terminal of an adjacent cell located outside the cell shell in a second direction. The second direction is perpendicular to the first direction. The connector comprises N conductive sheets arranged at intervals. The electrode terminals connect the conductive sheets. By arranging the electrode terminals of adjacent cells so as not to overlap in the first direction, it is facilitated for the electrode terminals to connect to other conductive members, thereby reducing the risk of short circuits occurring at adjacent electrode terminals.

[0006] Optionally, in some embodiments of the present application, the electrode terminal includes a first terminal and a second terminal with opposite polarities. The second terminal and the first terminal are arranged along the second direction. The second terminal of any battery cell between the first battery cell and the M-th battery cell is connected to the same conductive sheet as the first terminal of the adjacent battery cell to achieve series connection.

[0007] Optionally, in some embodiments of the present application, the portion of the electrode terminal located outside the battery cell casing includes a connecting portion, N=1+M, M≥3.

[0008] Optionally, in some embodiments of the present application, the connector includes a first insulating member and a second insulating member, a plurality of spaced conductive sheets are located between the first insulating member and the second insulating member, and portions of the conductive sheets are exposed from the first insulating member and / or the second insulating member.

[0009] Optionally, in some embodiments of the present application, the conductive sheet includes a first section. The first section includes a first surface and a second surface arranged along a third direction. The second surface faces the battery cell housing. Electrode terminals are connected to the first surface and / or the second surface, providing a variety of connection methods between the electrode terminals and the conductive sheet, and the third direction is perpendicular to both the first and second directions.

[0010] Optionally, in some embodiments of the present application, the first insulating member and the second insulating member are arranged along a third direction. The first insulating member and / or the second insulating member have an opening. A projection of the first segment overlaps with a projection of the opening along the third direction. The electrode terminal is connected to the first segment.

[0011] Optionally, in some embodiments of the present application, the first insulating member has a first opening. The second insulating member has a second opening. Along the first direction, a first gap is defined between an edge of the first segment and an edge of the first opening. The electrode terminal extends from the first gap through the second opening and connects to the first surface, facilitating inspection of welding quality.

[0012] Optionally, in some embodiments of the present application, along the third direction, a projection of the first gap overlaps with a projection of the second opening.

[0013] Optionally, in some embodiments of the present application, the second insulating member has a second opening. Along the third direction, a projection of the second opening overlaps a projection of the first section. The electrode terminal is connected to the second surface, thereby improving automation efficiency.

[0014] Optionally, in some embodiments of the present application, the first insulating member has a first opening. The second insulating member has a second opening. Some electrode terminals extend through the second opening and connect to the first surface. Along the third direction, the projection of the second opening overlaps with the projection of the first section. The remaining electrode terminals connect to the second surface, facilitating inspection of welding quality.

[0015] Optionally, in some embodiments of the present application, the conductive sheet further includes a second segment. The second segment extends beyond the first insulating member and the second insulating member. Multiple second segments are spaced apart to facilitate welding of the second segments to other conductive members, thereby reducing damage to the battery cell during the welding process.

[0016] Optionally, in some embodiments of the present application, the conductive sheet further includes a third section, the third section is disposed between the first insulating member and the second insulating member, and the third section connects the first section and the second section.

[0017] Optionally, in some embodiments of the present application, the third section includes a third sub-section. The third sub-section bends along the second direction toward the second insulating member. The second section connects to the third sub-section, further increasing the distance between adjacent second sections and further reducing the risk of adjacent second sections touching and causing a short circuit.

[0018] Optionally, in some embodiments of the present application, the edge of the electrode terminal is spaced apart from the edge of the first opening to facilitate welding and reduce interference between the connecting portion and the first insulating member.

[0019] Optionally, in some embodiments of the present application, the battery cell housing includes a first portion and a second portion. The electrode terminal extends from the second portion. The second portion connects to the first portion and forms a first recess. The thickness of the first portion along the first direction is less than 6 mm.

[0020] Optionally, in some embodiments of the present application, along the first direction, the thickness of the first part is 2 mm-4 mm.

[0021] Optionally, in some embodiments of the present application, a circuit board is further included, and the second section is connected to the circuit board.

[0022] Optionally, in some embodiments of the present application, the electrode terminals of adjacent battery cells are located at different positions on the battery cell housing. Along the second direction, the width of the first terminal is W1, the width of the second terminal is W2, the distance between the opposing edges of the first terminal and the second terminal of one battery cell along the second direction is W3, and the distance between the opposing edges of the first terminal and the second terminal of another adjacent battery cell along the second direction is W4, satisfying W1+W2+W4<W3.

[0023] Optionally, in some embodiments of the present application, the electrode terminals of each battery cell are arranged at the same position of the battery cell housing. The battery cell housing includes a first side and a second side arranged along the second direction. Along the second direction, the distance between the first side and the second side is W, the distance between the edge of the first terminal close to the first side and the first side is F1, and the distance between the edge of the second terminal close to the second side and the second side is F2. The width of the first terminal is W1, and the width of the second terminal is W2, satisfying F 1+ W1<F2 and 2*(F2+W2)<W.

[0024] Optionally, in some embodiments of the present application, along the second direction, the distance between the second terminals of adjacent battery cells is d, and d satisfies d = [W-F1-F1-2*(W1+W2)] / 3, so that the first terminals and second terminals of adjacent battery cells maintain approximately the same distance from each other in the second direction, reducing the probability of short circuit and the risk of short circuit when the battery cells are thin.

[0025] An embodiment of the present application further provides an electrical device, comprising the battery pack according to any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of a battery cell assembly and connectors in some embodiments.

[0027] FIG2 shows an exploded schematic diagram of a battery cell assembly and connectors in some embodiments.

[0028] FIG3 shows a schematic structural diagram of a battery cell in some embodiments.

[0029] FIG4 shows an exploded schematic diagram of a battery cell in some embodiments.

[0030] FIG5 is a schematic structural diagram of a first group of battery cells in some embodiments.

[0031] FIG6 shows an exploded schematic diagram of battery cells in other embodiments.

[0032] FIG7 shows a schematic structural diagram of an electrode assembly in some embodiments.

[0033] FIG8 is a schematic structural diagram of a battery cell assembly and an insulating component in some embodiments.

[0034] FIG9 is a schematic structural diagram of a first group of battery cells and a second group of battery cells in some embodiments.

[0035] FIG10 is a schematic front view of the structure of a battery cell in some embodiments.

[0036] FIG11 shows a schematic structural diagram of the battery cells in FIG10 after being stacked.

[0037] FIG12 shows a schematic front view of the structure of battery cells in other embodiments.

[0038] FIG13 shows a schematic front view of the structure of battery cells in some other embodiments.

[0039] FIG14 shows a schematic structural diagram of the battery cells shown in FIG12 and FIG13 after being stacked.

[0040] FIG15 is a schematic diagram showing the front view of the stacked battery cells in FIG14 .

[0041] FIG. 16 shows an exploded schematic diagram of a connector in some embodiments.

[0042] FIG17 is a schematic diagram showing a structure in which an electrode terminal is connected to a connecting member in some embodiments.

[0043] FIG18 is a schematic structural diagram showing electrode terminals connected to connectors in other embodiments.

[0044] FIG19 shows a schematic structural diagram of a circuit board, a bracket, a battery cell assembly, and connectors in some embodiments.

[0045] FIG. 20 is an exploded schematic diagram of the structure shown in FIG. 19 .

[0046] FIG. 21 shows an exploded schematic diagram of a battery pack in some embodiments.

[0047] FIG22 shows a schematic structural diagram of electrical equipment in some embodiments.

[0048] Description of main component symbols:

[0049] Battery Pack 100

[0050] Battery cell assembly 10

[0051] Cells 11, 11a1, 11a2, 11b1, 11b2

[0052] The first group of battery cells 11a

[0053] The second group of battery cells 11b

[0054] Battery cell housing 111

[0055] Part 111a

[0056] Part 2111b

[0057] First recess 111c

[0058] 2nd recessed part 111d

[0059] first side 111e

[0060] Second side 111f

[0061] First shell 1111

[0062] Second housing 1112

[0063] First extension portion 1113

[0064] Second extension portion 1114

[0065] First sealing portion 1115

[0066] Second sealing portion 1116

[0067] Electrode assembly 112

[0068] First pole piece 112a

[0069] Second pole piece 112b

[0070] Isolation film 112c

[0071] Electrode terminal 113

[0072] Connecting portion 113a

[0073] First terminal 113b

[0074] First Edge 1131

[0075] Second edge 1132

[0076] Second terminal 113c

[0077] Third Edge 1133

[0078] Fourth Edge 1134

[0079] Insulation component 12

[0080] Connector 20

[0081] Through hole 201

[0082] First opening 20a

[0083] Second opening 20b

[0084] First insulating member 21

[0085] First gap 21a

[0086] Second insulating member 22

[0087] Conductive sheet 23

[0088] First section 231

[0089] First surface 231a

[0090] First extension area 2312

[0091] Second surface 231b

[0092] Second section 232

[0093] The third section 233

[0094] The third subsection 233a

[0095] Circuit board 30

[0096] Second through hole 31

[0097] Bracket 40

[0098] First space 40a

[0099] First through hole 41

[0100] Buffer 50

[0101] Housing 60

[0102] First housing 61

[0103] Second housing 62

[0104] Electrical equipment 200

[0105] First direction X

[0106] Second direction Y

[0107] The third direction Z

[0108] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0109] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0110] When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there may be a component intervening therebetween. When a component is referred to as being “connected to” another component, it can be directly connected to the other component or there may be a component intervening therebetween.

[0111] It can be understood that the terms "perpendicular, equal" are used to describe the ideal state between two components. In actual production or use, there may be a state between the two components that is approximately perpendicular or equal, generally with a fluctuation range of ±10%. For example, combined with numerical descriptions, perpendicular can refer to the angle between two straight lines being between 90°±10°, perpendicular can also refer to the dihedral angle between two planes being between 90°±10°, and perpendicular can also refer to the angle between a straight line and a plane being between 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0112] The term "parallel" is used to describe the ideal state between two components. In actual production or use, there may be a state of approximate parallelism between the two components. For example, combined with numerical descriptions, parallel can refer to the angle between two straight lines being in the range of 180°±10°, parallel can also refer to the dihedral angle between two planes being in the range of 180°±10°, and parallel can also refer to the angle between a straight line and a plane being in the range of 180°±10°. The two components described as "parallel" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if its overall extension direction is a straight line or a plane.

[0113] Unless otherwise defined, the term "plurality" herein, when used to describe the number of components, specifically means that the components are two or more.

[0114] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0115] An embodiment of the present application provides a battery pack comprising a cell assembly and a connector. The cell assembly comprises M cells stacked along a first direction. Each cell comprises a cell shell, an electrode terminal and an electrode assembly disposed in the cell shell. The electrode terminal connects the electrode assembly and extends from the cell shell. Along the first direction, the projection of the portion of the electrode terminal of any cell located outside the cell shell is separated from the projection of the portion of the electrode terminal of an adjacent cell located outside the cell shell in a second direction. The second direction is perpendicular to the first direction. The connector comprises N conductive sheets arranged at intervals. The electrode terminals connect the conductive sheets. By arranging the electrode terminals of adjacent cells so as not to overlap in the first direction, it is facilitated for the electrode terminals to connect to other conductive members, thereby reducing the risk of short circuits occurring at adjacent electrode terminals.

[0116] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0117] Referring to Figures 1, 2, 3, and 4, an embodiment of the present application provides a battery pack 100 including a cell assembly 10 and a connector 20. The cell assembly 10 includes M cells 11 stacked along a first direction X. Each cell 11 includes a cell housing 111, an electrode terminal 113, and an electrode assembly 112 disposed within the cell housing 111. The electrode terminal 113 connects to the electrode assembly 112 and extends from the cell housing 111. The electrode terminals 113 include a first terminal 113b and a second terminal 113c. The first and second terminals 113b and 113c are arranged along a second direction Y. The first and second terminals 113b and 113c have opposite polarities, with one of the first and second terminals 113b and 113c being a positive terminal and the other being a negative terminal. This specification uses the example of the first terminal 113b being the positive terminal and the second terminal 113c being the negative terminal. Along the first direction X, the projection of the portion of the electrode terminal 113 of any one of the battery cells 11 located outside the battery cell casing 111 is separated from the projection of the portion of the electrode terminal 113 of the adjacent battery cell 11 located outside the battery cell casing 111 in the second direction Y, and each electrode terminal 113 is connected to the connector 20. By arranging the electrode terminals 113 of adjacent battery cells 11 in a non-overlapping manner in the first direction X, the risk of short circuiting of adjacent electrode terminals 113 is reduced, facilitating connection with the connector 20, and reducing or eliminating the need for spacers, such as foam, between the battery cell casings 111 to increase the distance between adjacent electrode terminals 113. This facilitates the production of a thinner battery pack 100 and improves the energy density of the battery pack 100.

[0118] In one embodiment, the cell housing 111 includes a first portion 111a and a second portion 111b. The first portion 111a accommodates the electrode assembly 112. The second portion 111b connects to the first portion 111a to form a first recess 111c. The electrode terminal 113 extends from the second portion 111b. Optionally, the cell housing 111 comprises an aluminum-plastic film. Optionally, the cell 11 comprises a pouch cell.

[0119] In one embodiment, the thickness of the first portion 111a along the first direction X is less than 6 mm, which is beneficial for reducing the volume of the battery cell 11. Optionally, the thickness of the first portion 111a along the first direction X is 2 mm to 4 mm. The thickness of the first portion 111a can be any one of 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, and 4.0 mm.

[0120] Referring to Figures 4, 5, and 6, in one embodiment, the battery cell casing 111 includes a first outer casing 1111 and a second outer casing 1112, with the first outer casing 1111 connected to the second outer casing 1112. One of the first and second outer casings 1111, 1112 has a second recess 111d for accommodating the electrode assembly 112, while the other is a flat surface. The first and second outer casings 1111, 1112 can be folded along the connection point (dashed line), overlapping to form a first portion 111a that encloses the electrode assembly 112. The first outer casing 1111 extends outwardly from its periphery to form a plurality of first extensions 1113, while the second outer casing 1112 extends outward from its periphery to form a plurality of second extensions 1114. After the first and second outer casings 1111, 1112 are folded along the connection point, the first and second extensions 1113, 1114 overlap and are sealed together to form a second portion 111b. Optionally, the first extension portion 1113 and the second extension portion 1114 are sealed and connected by a sealant. The second portion 111b includes a first sealing portion 1115 and a second sealing portion 1116, the first sealing portion 1115 being arranged opposite the connection position, and the electrode terminal 113 extending from the first sealing portion 1115 to the first portion 111a. Optionally, the second portion 111b includes two second sealing portions 1116, which are arranged along the second direction Y. The second direction Y is perpendicular to the first direction X. Optionally, the second portion 111b includes one first sealing portion 1115, and the battery cell 11 includes two electrode terminals 113, which extend from the first sealing portion 1115 to the battery cell housing 111. In other embodiments, the first housing 1111 and the second housing 1112 are spaced apart, the second portion 111b includes two first sealing portions 1115, and the two first sealing portions 1115 are arranged along a third direction Z. The battery cell 11 includes two electrode terminals 113, one of which extends out of the battery cell housing 111 from one of the first sealing portions 1115, and the other electrode terminal 113 extends out of the battery cell housing 111 from the other first sealing portion 1115. The two electrode terminals 113 are arranged along the third direction Z. The third direction Z is perpendicular to both the first direction X and the second direction Y.

[0121] By providing a second recess 111d in one of the first housing 1111 and the second housing 1112, the space within the first recess 111c can be increased. When the battery cells 11 are stacked, the first recesses 111c of adjacent battery cells 11 are interconnected, further increasing the space. This also increases the distance between the electrode terminals 113 of adjacent battery cells 11 along the first direction X, reducing the risk of short circuits. In one embodiment, an insulating member 12 is provided within the first recess 111c. The insulating member 12 is positioned between the first portion 111a and the connector 20, further reducing the risk of short circuits between the battery cells 11 and the connector 20. Optionally, the insulating member 12 comprises foam.

[0122] Referring to FIG. 6 , in another embodiment, the cell housing 111 includes a first outer shell 1111 and a second outer shell 1112, wherein the first outer shell 1111 is connected to the second outer shell 1112. Both the first outer shell 1111 and the second outer shell 1112 are provided with a second recess 111d. A portion of the electrode assembly 112 is disposed within the second recess 111d of the first outer shell 1111, and a portion of the electrode assembly 112 is disposed within the second recess 111d of the second outer shell 1112. Along the first direction X, first recesses 111c are provided on both sides of the second portion 111b.

[0123] Referring to FIG. 7 , in one embodiment, the electrode assembly 112 includes a wound structure formed by stacking and winding a first electrode piece 112 a, a second electrode piece 112 b, and a separator 112 c. In other embodiments, the electrode assembly 112 may also be a laminated structure, with the first electrode piece 112 a, the separator 112 c, and the second electrode piece 112 b stacked sequentially, with the first electrode piece 112 a and the second electrode piece 112 b having opposite polarities.

[0124] In one embodiment, the portion of the electrode terminal 113 located outside the cell casing 111 includes a connecting portion 113a, which is used for welding to other conductive structural components. The connecting portion 113a is formed by bending the electrode terminal 113 and is connected to the connector 20. Both the first terminal 113b and the second terminal 113c are provided with a connecting portion 113a. In other embodiments, the connecting portion 113a may also be a flat, plate-like structure.

[0125] Please refer to Figures 5, 9, and 11, which show schematic diagrams of the structure of the electrode terminal 113 without being bent. The battery cell assembly 10 includes a first group of battery cells 11a and a second group of battery cells 11b, with the first group of battery cells 11a and the second group of battery cells 11b being arranged adjacent to each other. The first group of battery cells 11a includes two battery cells 11a1 and 11a2, and the second group of battery cells 11b includes two battery cells 11b1 and 11b2. Along a first direction X, the battery cells 11a1, 11a2, 11b1, and 11b2 are arranged in sequence. Along the first direction X, the projections of the portions of the electrode terminals 113 of the adjacent battery cells 11 located outside the battery cell housing 111 are separated in a second direction Y.

[0126] In one embodiment, along the first direction X, the projection of the portion of the first terminal 113b of the battery cell 11a2 located outside the battery housing 111, the projection of the portion of the second terminal 113c of the battery cell 11a1 located outside the battery housing 111, the projection of the portion of the second terminal 113c of the battery cell 11a2 located outside the battery housing 111, and the projection of the portion of the first terminal 113b of the battery cell 11a1 located outside the battery housing 111 are sequentially spaced apart in the second direction Y. Along the first direction X, the projections of the portions of the two second terminals 113c located outside the battery housing 111 are located between the projections of the portions of the two first terminals 113b located outside the battery housing 111, which facilitates connection of the battery cells 11.

[0127] In one embodiment, along the first direction X, the projection of the portion of the first terminal 113b of the battery cell 11b2 located outside the battery housing 111, the projection of the portion of the second terminal 113c of the battery cell 11b1 located outside the battery housing 111, the projection of the portion of the second terminal 113c of the battery cell 11b2 located outside the battery housing 111, and the projection of the portion of the first terminal 113b of the battery cell 11b1 located outside the battery housing 111 are sequentially spaced apart in the second direction Y. Along the first direction X, the projection of the portions of the two second terminals 113c located outside the battery housing 111 is located between the projections of the portions of the two first terminals 113b located outside the battery housing 111, which facilitates connection of the battery cell 11.

[0128] In one embodiment, along the first direction X, the projection of the portion of the first terminal 113b of the battery cell 11a2 located outside the battery housing 111, the projection of the portion of the second terminal 113c of the battery cell 11b1 located outside the battery housing 111, the projection of the portion of the second terminal 113c of the battery cell 11a2 located outside the battery housing 111, and the projection of the portion of the first terminal 113b of the battery cell 11b1 located outside the battery housing 111 are sequentially spaced apart in the second direction Y. Along the first direction X, the projections of the portions of the two second terminals 113c located outside the battery housing 111 are located between the projections of the portions of the two first terminals 113b located outside the battery housing 111, which facilitates connection of the battery cells 11.

[0129] The present application arranges the electrode terminals 113 of adjacent battery cells 11 in a non-overlapping manner in the first direction X, so that the adjacent electrode terminals 113 are staggered, thereby reducing the risk of short circuit caused by contact between adjacent electrode terminals 113, and eliminating or reducing the need to add an isolating member between the fitted first parts 111a to increase the distance between adjacent electrode terminals 113. This is conducive to producing a thinner battery pack 100 and improving the energy density of the battery pack 100. It can also increase the arrangement of the battery cells 11 with a structure in which only a second recess 111d is provided in the first part 111a, thereby facilitating production.

[0130] In one embodiment, the first recess 111c of the battery cell 11a1 and the first recess 111c of the battery cell 11a2 are arranged opposite to each other, and the first recess 111c of the battery cell 11a1 and the first recess 111c of the battery cell 11a2 are connected, which can provide more space for the connecting portion 113a of the battery cell 11a1 and the connecting portion 113a of the battery cell 11a2, thereby increasing the area of ​​the connecting portion 113a.

[0131] In one embodiment, the first recess 111c of the battery cell 11b1 and the first recess 111c of the battery cell 11b2 are arranged opposite to each other, and the first recess 111c of the battery cell 11b1 and the first recess 111c of the battery cell 11b2 are connected, which can provide more space for the connecting portion 113a of the battery cell 11b1 and the connecting portion 113a of the battery cell 11b2, thereby increasing the area of ​​the connecting portion 113a.

[0132] In one embodiment, the first recess 111 c of the battery cell 11 a 2 and the first recess 111 c of the battery cell 11 b 1 are disposed away from each other, which facilitates the connection of the electrode terminal 113 .

[0133] In one embodiment, the battery cell housing 111 includes a first side 111e and a second side 111f arranged along the second direction Y. The distance between the first side 111e and the second side 111f along the second direction Y is the width W of the battery cell 11. The first terminal 113b includes a first edge 1131 and a second edge 1132 arranged along the second direction Y, and the distance between the first edge 1131 and the second edge 1132 along the second direction Y is the width W1 of the first terminal 113b. Along the second direction Y, the distance between the first edge 1131 and the first side 111e is F1. The second terminal 113c includes a third edge 1133 and a fourth edge 1134 arranged along the second direction Y, and the distance between the third edge 1133 and the fourth edge 1134 along the second direction Y is the width W2 of the second terminal 113c. Along the second direction Y, the distance between the fourth edge 1134 and the second side 111f is F2. Wherein, F1 is smaller than F2, and F 1+ W1<F2 and 2*(F2+W2)<W.

[0134] Figure 11 shows a schematic diagram of two stacked battery cells 11 with their electrode terminals 113 unbent. Taking the first group of battery cells 11a as an example, the electrode terminals 113 of battery cells 11a1 and 11a2 are positioned in the same position. Observing along the first direction X, along the second direction Y, the first terminal 113b of battery cell 11a2, the second terminal 113c of battery cell 11a1, the second terminal 113c of battery cell 11a2, and the first terminal 113b of battery cell 11a1 are sequentially spaced apart. The two second terminals 113c are located between the two first terminals 113b. The distance between the opposing edges of the two second terminals 113c along the second direction Y is defined as d, where d = [W - F1 - F1 - 2 * (W1 + W2)] / 3. Observed along the first direction X, along the second direction Y, the distance between the edges of the first terminal 113b of the battery cell 11a2 and the second terminal 113c of the battery cell 11a1 relative to each other is d1, and the distance between the edges of the first terminal 113b of the battery cell 11a1 and the second terminal 113c of the battery cell 11a2 relative to each other is d2, wherein d=d1=d2, or d1 and d2 are approximately equal to d, so that the first terminals 113b and the second terminals 113c of adjacent battery cells 11 maintain approximately the same distance from each other in the second direction Y, and when the battery cell 11 is thin, the probability of short circuit is reduced, thereby lowering the risk of short circuit.

[0135] Please refer to Figures 12-15, which show the structure of the electrode terminal 113 without bending. Taking the first group of battery cells 11a as an example, the electrode terminals 113 of the battery cells 11a1 and 11a2 are arranged at different positions. The distance between the first edge 1131 of the battery cell 11a1 and the first side 111e along the second direction Y is F. 11 The distance between the fourth edge 1134 and the second side 111f along the second direction Y is F 12 , the distance W3 between the second edge 1132 and the third edge 1133 along the second direction Y, wherein F 11 =F 12 , and W3<F 11 , W3<F 12 The distance between the first edge 1131 and the first side 111e of the battery cell 11a2 along the second direction Y is F. 21 The distance between the fourth edge 1134 and the second side 111f along the second direction Y is F 22 , the distance W4 between the second edge 1132 and the third edge 1133 along the second direction Y, wherein F 21 =F 22 , and W4>F 21 , W4>F 22 . F 11 >F 21 , W1+W2+W3<W4.

[0136] Figure 15 shows a schematic diagram of stacked battery cells 11 with their electrode terminals 113 unbent, using the first group of battery cells 11a as an example. Along a first direction X, the projection of the portion of the first terminal 113b of battery cell 11a2 outside the battery casing 111, the projection of the portion of the second terminal 113c of battery cell 11a1 outside the battery casing 111, the projection of the portion of the first terminal 113b of battery cell 11a1 outside the battery casing 111, and the projection of the portion of the second terminal 113c of battery cell 11a2 outside the battery casing 111 are sequentially spaced apart in a second direction Y. Along the first direction X, the projection of the first terminal 113b of the battery cell 11a1 outside the battery cell case 111 and the projection of the second terminal 113c outside the battery cell case 111 are located between the projection of the first terminal 113b of the battery cell 11a2 outside the battery cell case 111 and the projection of the second terminal 113c outside the battery cell case 111, and the first terminal 113b of the battery cell 11a2 is close to the second terminal 113c of the battery cell 11a1. Along the second direction Y, the distance d1 between the first terminal 113b of the battery cell 11a2 and the second terminal 113c of the battery cell 11a1, and the distance d2 between the first terminal 113b of the battery cell 11a1 and the second terminal 113c of the battery cell 11a2 are equal to or approximately equal to the distance d(W3) between the first terminal 113b and the second terminal 113c of the battery cell 11a1, so that the first terminal 113b and the second terminal 113c of the adjacent battery cells 11 maintain approximately the same distance from each other in the second direction Y, thereby reducing the probability of short circuit and the risk of short circuit when the battery cell 11 is thin.

[0137] Referring to FIG. 18 , in one embodiment, along a first direction X, projections of the connecting portions 113a of two adjacent battery cells 11 are spaced apart in a second direction Y. Along the first direction X, the projections of the connecting portion 113a of the first terminal 113b of the battery cell 11a2, the projections of the connecting portion 113a of the second terminal 113c of the battery cell 11a1, the projections of the connecting portion 113a of the second terminal 113c of the battery cell 11a2, and the projections of the connecting portion 113a of the first terminal 113b of the battery cell 11a1 are sequentially spaced apart in the second direction Y. Along the first direction X, the projections of the connecting portions 113a of the two second terminals 113c are located between the projections of the connecting portions 113a of the two first terminals 113b, facilitating connection of the battery cells 11.

[0138] In one embodiment, along the first direction X, projections of the connecting portions 113a of two adjacent battery cells 11 are spaced apart in the second direction Y. Along the first direction X, the projections of the connecting portion 113a of the first terminal 113b of battery cell 11b2, the projections of the connecting portion 113a of the second terminal 113c of battery cell 11b1, the projections of the connecting portion 113a of the second terminal 113c of battery cell 11b2, and the projections of the connecting portion 113a of the first terminal 113b of battery cell 11b1 are sequentially spaced apart in the second direction Y. Along the first direction X, the projections of the connecting portions 113a of the two second terminals 113c are located between the projections of the connecting portions 113a of the two first terminals 113b, facilitating connection of the battery cells 11.

[0139] In one embodiment, along the first direction X, projections of the connecting portions 113a of two adjacent battery cells 11 are spaced apart in the second direction Y. Along the first direction X, the projections of the connecting portion 113a of the first terminal 113b of battery cell 11a2, the projections of the connecting portion 113a of the second terminal 113c of battery cell 11b1, the projections of the connecting portion 113a of the second terminal 113c of battery cell 11a2, and the projections of the connecting portion 113a of the first terminal 113b of battery cell 11b1 are sequentially spaced apart in the second direction Y. Along the first direction X, the projections of the connecting portions 113a of the two second terminals 113c are located between the projections of the connecting portions 113a of the two first terminals 113b, facilitating connection of the battery cells 11.

[0140] Referring to Figures 2 and 16 , the connector 20 includes a first insulating member 21, a second insulating member 22, and N conductive plates 23 spaced apart between the first and second insulating members 21, 22. Optionally, N = 1 + M, where M ≥ 3. The first and second insulating members 21, 22 are arranged along a third direction Z. A portion of each conductive plate 23 is exposed from the first and / or second insulating members 21, 22, and the electrode terminal 113 is connected to the conductive plate 23. Optionally, the connecting portion 113a is connected to the conductive plate 23. In one embodiment, the second terminal 113c of any battery cell between the first and M-th battery cells and the first terminal 113b of the adjacent battery cell 11 are connected to the same conductive plate 23 to achieve series connection. In other embodiments, adjacent battery cells 11 may be connected in parallel. The electrode terminal 113 may be welded to the conductive plate 23. Optionally, the electrode terminal 113 may be laser welded to the conductive plate 23. Optionally, the electrode terminal 113 may be ultrasonically welded to the conductive plate 23. In one embodiment, the conductive sheet 23 includes a first section 231. The first section 231 is exposed from the first insulating member 21 and / or the second insulating member 22. Along the third direction Z, the projection of the first section 231 overlaps with the projection of the electrode terminal 113. Optionally, along the third direction Z, the projection of the first section 231 overlaps with the projection of the connecting portion 113a, and the first section 231 is at least partially connected to the connecting portion 113a. Optionally, along the third direction Z, the projection of the connecting portion 113a lies within the projection of the first section 231. This makes the area of ​​the first section 231 available for welding larger than the area of ​​the connecting portion 113a, facilitating welding and reducing the possibility of partially connecting the connecting portion 113a not being connected to the first section 231.

[0141] In one embodiment, the first insulating member 21 and the second insulating member 22 are flexible, which can improve toughness and reduce pulling under vibration conditions, such as pulling on the electrode terminal 113, thereby reducing the risk of the electrode terminal 113 being separated from the first section 231.

[0142] Referring to Figures 1, 2, and 16, in one embodiment, the first section 231 includes a first surface 231a and a second surface 231b arranged along a third direction Z. The second surface 231b is closer to the cell casing 111 than the first surface 231a. The first insulating member 21 has a first opening 20a, and the second insulating member 22 has a second opening 20b. Along the third direction Z, the projections of the first openings 20a and the second openings 20b overlap. The number of first openings 20a is the same as the number of conductive sheets 23, and the number of second openings 20b is the same as the number of conductive sheets 23. Along the third direction Z, at least a portion of the projection of the first section 231 lies within the projection of the first openings 20a, leaving a first gap 21a between the edge of the first section 231 and the edge of the first opening 20a. The electrode terminal 113 sequentially passes through the second opening 20b and the first gap 21a, and is bent and connected to the first surface 231a. By welding the entire connecting portion 113a to the first surface 231a, the weld quality can be easily inspected. Optionally, the first terminal 113b includes a conductive aluminum sheet, the second terminal 113c includes a conductive copper sheet, and the first section 231 includes a conductive copper sheet. Optionally, the conductive sheet 23 includes a first extended region 2312. The first extended region 2312 extends outward from the edge of the first section 231. The first insulating member 21 covers the first extended region 2312 and is used to connect to the edge of the first opening 20a.

[0143] Optionally, along the third direction Z, the projection of the second opening 20b lies within the projection of the first opening 20a, the projection of the first gap 21a overlaps the projection of the second opening 20b, and the projection of the second opening 20b is spaced apart from the projection of the first section 231. This allows the second insulating member 22 to cover the second surface 231b, leaving only the first surface 231a exposed, thereby reducing the risk of short circuits. Optionally, the edge of the connecting portion 113a is spaced from the edge of the first opening 20a to facilitate welding and reduce interference between the connecting portion 113a and the first insulating member 21.

[0144] Referring to Figures 16 and 17 , in one embodiment, the first section 231 includes a first surface 231a and a second surface 231b arranged along a third direction Z. The first insulating member 21 covers the first surface 231a. The second insulating member 22 has second openings 20b, the number of which is the same as the number of conductive sheets 23. When viewed from a direction opposite to the third direction Z, the projection of the second openings 20b overlaps with the projection of the first section 231, positioning the second surface 231b within the second openings 20b. The connecting portion 113a is connected to the second surface 231b. By completely welding the connecting portion 113a to the second surface 231b, automation efficiency is improved. Optionally, the first terminal 113b comprises a conductive aluminum sheet, the second terminal 113c comprises a conductive copper sheet, and the first section 231 comprises a conductive copper sheet. Optionally, the conductive sheet 23 includes a first extended region 2312. The first extension region 2312 is formed by extending outward from the edge of the first section 231 . The second insulating member 22 covers the first extension region 2312 and is used to connect to the edge of the second opening 20 b .

[0145] Optionally, the edge of the connecting portion 113 a is spaced apart from the edge of the second opening 20 b to facilitate welding and reduce interference between the connecting portion 113 a and the first insulating member 21 .

[0146] Optionally, along the third direction Z, the projection of the edge of the second opening 20b overlaps with the projection of the first section 231, reducing the gap between the first section 231 and the second opening 20b. The electrode terminal 113 does not need to pass through the second opening 20b, thereby reducing the area of ​​the second opening 20b and reducing the risk of short circuit.

[0147] Referring to Figures 16 and 18 , in one embodiment, the first section 231 includes a first surface 231a and a second surface 231b arranged along a third direction Z. The first insulating member 21 is provided with a first opening 20a, and the second insulating member 22 is provided with a second opening 20b. When viewed along the third direction Z, a portion of the first surface 231a of the first section 231 is located within the first opening 20a. When viewed opposite the third direction Z, a portion of the second surface 231b of the first section 231 is located within a portion of the second opening 20b. This portion of the second opening 20b allows the electrode terminals 113 to pass through. Some of the electrode terminals 113 pass through the second opening 20b and the first opening 20a and connect to the first surface 231a, while the remaining portion of the electrode terminals 113 is connected to the second surface 231b. Alternatively, the first terminal 113b passes through the second opening 20b and the first opening 20a and connects to the first surface 231a, while the second terminal 113c connects to the second surface 231b, facilitating production. Optionally, the first terminal 113b includes a conductive aluminum sheet, the second terminal 113c includes a conductive copper sheet, and the first section 231 includes a conductive copper sheet. Disposing the first terminal 113b on the first surface 231a is beneficial for checking welding quality and specific welding conditions.

[0148] In one embodiment, welding includes laser welding, ultrasonic welding, etc. In other embodiments, the connecting portion 113 a and the first section 231 may also be connected by other means such as conductive adhesive.

[0149] Please refer to Figures 1, 16 and 19. In one embodiment, the conductive sheet 23 also includes a second section 232. The second section 232 extends out of the first insulating member 21 and the second insulating member 22 for connection with other conductive members. A plurality of second sections 232 are spaced apart along the second direction Y to facilitate welding of the second sections 232 with other conductive members, thereby reducing damage to the battery cell 11 during the welding process. Optionally, the second section 232 is connected to the circuit board 30 to achieve connection between the battery cell 11 and the circuit board 30, thereby achieving voltage acquisition, reducing the use of sampling terminals and voltage sampling harnesses, and reducing the amount of materials. Optionally, the circuit board 30 includes a BMS component (Battery Management System). Specifically, the BMS component includes multiple electronic components, and the multiple electronic components can realize functions such as battery data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission. Optionally, the circuit board 30 includes a flexible printed circuit (FPC). Optionally, the circuit board 30 includes a printed circuit board (PCB), and a plurality of wires (not shown) are provided on the circuit board 30. Optionally, the second section 232 is connected to the circuit board 30 by welding.

[0150] In one embodiment, the conductive sheet 23 further includes a third section 233, which connects the first section 231 and the second section 232. The first and second insulating members 21 and 22 cover the third section 233, insulating the third section 233 and reducing material consumption and positioning of the multiple conductive sheets 23, thereby reducing the risk of short circuits caused by contact between the multiple conductive sheets 23.

[0151] Referring to Figures 1 and 16, in one embodiment, at least a portion of the third section 233 is bent to further increase the distance between adjacent second sections 232, further reduce the risk of adjacent second sections 232 touching each other and causing a short circuit, and further facilitate welding of the second sections 232 and the circuit board 30, further reducing damage to the battery cell 11 during the welding process.

[0152] In one embodiment, at least part of the third section 233 of the conductive sheet 23 includes a third sub-section 233 a . The third sub-section 233 a is bent along the second direction Y toward the second insulating member 22 . The second section 232 is connected to the third sub-section 233 a .

[0153] Referring to Figures 1 and 2, during the manufacture of the connector 20, a sheet of material is first continuously stamped using a stamping machine to form a plurality of conductive sheets 23. The sheet after forming the plurality of conductive sheets 23 comprises a first connecting band (not shown) and a second connecting band (not shown). The first and second connecting bands are continuous along the length of the sheet. The plurality of conductive sheets 23 are connected to the first and second connecting bands, so that the plurality of conductive sheets 23 are positioned between the first and second connecting bands. A first insulating member 21 and a second insulating member 22 are then respectively applied along a third direction Z to cover the plurality of conductive sheets 23. The first and second connecting bands of the sheet are then cut to disconnect the plurality of conductive sheets 23 from one another, thereby achieving a spaced arrangement of the plurality of conductive sheets 23. In one embodiment, after the first and second connecting bands of the sheet are cut, some of the conductive sheets 23 remain connected to one another. The connected portions of the two conductive sheets 23 and the first and second insulating members 21 and 22 covering the connected portions are then stamped to disconnect the interconnected conductive sheets 23, thereby forming a through hole 201 in the connector 20.

[0154] Referring to Figures 20 and 21 , in one embodiment, the battery pack 100 further includes a bracket 40 , with the cell assembly 10 and the circuit board 30 disposed on opposite sides of the bracket 40 along a first direction X. The bracket 40 is provided with first through holes 41 , such that the projection of the second section 232 along the first direction X is located within the projection of the first through holes 41 . The circuit board 30 is provided with a plurality of second through holes 31 , and the second section 232 passes through the first through holes 41 and is disposed within the second through holes 31 . The second section 232 is fixedly connected to the circuit board 30 by welding or conductive adhesive.

[0155] In one embodiment, the bracket 40 defines a first space 40a, within which the battery cell assembly 10 is disposed. Optionally, an insulating buffer 50 is disposed between the battery cell assembly 10 and the inner wall of the first space 40a to secure the position of the battery cell assembly 10 and provide cushioning for the battery cell assembly 10. Optionally, the buffer 50 comprises foam.

[0156] In one embodiment, the battery pack 100 further includes a shell 60 , which includes a first shell 61 and a second shell 62 , wherein the first shell 61 is connected to the second shell 62 to accommodate the battery cell assembly 10 , the connector 20 , the circuit board 30 and the bracket 40 in the first shell 61 and the second shell 62 .

[0157] 22 , the present application also provides an electrical device 200 using the battery pack 100. In one embodiment, the electrical device 200 of the present application may be, but is not limited to, a drone, a cleaning tool, a backup power supply, an electric car, an electric motorcycle, an electric power-assisted bicycle, an electric tool, a large household battery, and the like.

[0158] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments fall within the scope disclosed in the present application.

Claims

1. A battery pack comprising: A battery cell assembly, the battery cell assembly comprising M battery cells stacked along a first direction, each battery cell comprising a battery cell housing, an electrode terminal, and an electrode assembly disposed within the battery cell housing, the electrode terminal being connected to the electrode assembly and extending from the battery cell housing, wherein along the first direction, a projection of a portion of the electrode terminal of any battery cell located outside the battery cell housing is separated from a projection of a portion of the electrode terminal of an adjacent battery cell located outside the battery cell housing in a second direction, the second direction being perpendicular to the first direction; The connecting member includes N conductive sheets arranged at intervals, and the electrode terminals are connected to the conductive sheets.

2. The battery pack according to claim 1, wherein: The electrode terminal includes a first terminal and a second terminal with opposite polarities, the second terminal and the first terminal are arranged along the second direction, and the second terminal of any battery cell located between the first battery cell and the Mth battery cell is connected to the same conductive sheet as the first terminal of the adjacent battery cell.

3. The battery pack according to claim 2, wherein: The portion of the electrode terminal located outside the battery cell shell includes a connecting portion, N=1+M, M≥3.

4. The battery pack according to any one of claims 1 to 3, wherein: The connecting member includes a first insulating member and a second insulating member, a plurality of conductive sheets arranged at intervals are located between the first insulating member and the second insulating member, and parts of the conductive sheets are exposed from the first insulating member and / or the second insulating member.

5. The battery pack according to claim 4, wherein: The conductive sheet includes a first section, the first section includes a first surface and a second surface arranged along a third direction, the second surface faces the battery cell shell, the electrode terminal is connected to the first surface and / or the second surface, and the third direction is perpendicular to both the first direction and the second direction.

6. The battery pack according to claim 5, wherein: The first insulating member and the second insulating member are arranged along the third direction. The first insulating member and / or the second insulating member are provided with an opening. Along the third direction, the projection of the first segment overlaps with the projection of the opening. The electrode terminal is connected to the first segment.

7. The battery pack according to claim 6, wherein: The first insulating member is provided with a first opening, the second insulating member is provided with a second opening, and a first gap is provided between the edge of the first section and the edge of the first opening along the first direction. The electrode terminal extends from the first gap through the second opening and is connected to the first surface.

8. The battery pack according to claim 7, wherein: Along the third direction, a projection of the first gap overlaps with a projection of the second opening.

9. The battery pack according to claim 6, wherein: The second insulating member is provided with a second opening. Along the third direction, a projection of the second opening overlaps with a projection of the first section. The electrode terminal is connected to the second surface.

10. The battery pack according to claim 6, wherein: The first insulating member is provided with a first opening, the second insulating member is provided with a second opening, some of the electrode terminals pass through the second opening and are connected to the first surface, along the third direction, the projection of the second opening overlaps with the projection of the first section, and the remaining electrode terminals are connected to the second surface.

11. The battery pack according to claim 6, wherein: The conductive sheet further includes a second section extending out from the first insulating member and the second insulating member, and a plurality of second sections are arranged at intervals.

12. The battery pack according to claim 11, wherein: The conductive sheet further includes a third section, which is disposed between the first insulating member and the second insulating member and connects the first section and the second section.

13. The battery pack according to claim 7, wherein: An edge of the electrode terminal is spaced apart from an edge of the first opening.

14. The battery pack according to claim 4, wherein: The battery cell case includes a first portion and a second portion, the electrode terminal extends from the second portion, the second portion connects to the first portion and forms a first recess, and along the first direction, the thickness of the first portion is less than 6 mm.

15. The battery pack according to claim 14, wherein: Along the first direction, the thickness of the first portion is 2 mm-4 mm.

16. The battery pack according to claim 11, wherein: A circuit board is also included, and the second section is connected to the circuit board.

17. The battery pack according to claim 2, wherein: The electrode terminals of adjacent battery cells are arranged at different positions of the battery cell shell. Along the second direction, the width of the first terminal is W1, and the width of the second terminal is W2. Along the second direction, the distance between the opposite edges of the first terminal and the second terminal of one battery cell is W3, and the distance between the opposite edges of the first terminal and the second terminal of another adjacent battery cell is W4, satisfying W1+W2+W3<W4.

18. The battery pack according to claim 2, wherein: The electrode terminals of each battery cell are arranged at the same position of the battery cell shell. The battery cell shell includes a first side and a second side arranged along the second direction. Along the second direction, the distance between the first side and the second side is W, the distance between the edge of the first terminal close to the first side and the first side is F1, and the distance between the edge of the second terminal close to the second side and the second side is F. 2， The width of the first terminal is W1, and the width of the second terminal is W2, satisfying F1+W1<F2 and 2*(F2+W2)<W.

19. The battery pack according to claim 18, wherein: Along the second direction, the distance between the second terminals of adjacent battery cells is d, and d satisfies d=[W-F1-F1-2*(W1+W2)] / 3.

20. An electrical device, characterized in that: Comprising the battery pack according to any one of claims 1 to 19.

Images