Battery packs and power-consuming devices

Abstract

The present application provides a battery pack (100) and a power consumption device including the battery pack (100). The battery pack (100) includes a cell assembly (10) and a connection member (20). The cell assembly (10) includes M cells (11) stacked along a first direction (X). Each cell (11) includes a cell case (111), an electrode terminal (113), and an electrode assembly (112) installed within the cell case (111). The connection member (20) includes N conductive pieces (23) installed at intervals. The electrode terminals (113) are connected to the conductive pieces (23). By arranging the electrode terminals (113) of adjacent cells (11) so that they do not overlap in the first direction (X), the risk of short-circuiting between adjacent electrode terminals (113) is reduced. The electrode terminals 113 are connected to the electrode assemblies 112 and extend from the cell casing 111. A projection of the portion of the electrode terminal 113 located outside the cell casing 111 in one cell 11 along the first direction X is spaced apart in the second direction Y from a projection of the portion of the electrode terminal 113 located outside the cell casing 111 in an adjacent cell 11. The second direction Y is perpendicular to the first direction X, making it easy to connect the electrode terminals 113 to other conductive members.

Description

[Technical Field]

[0001] This application relates to the technical field of energy storage, and in particular to battery packs and power consuming devices. [Background technology]

[0002] The cells of a battery pack are usually stacked, and the electrode terminals of each cell overlap in the stacking direction. This reduces the space available for welding, and the distance between the electrode terminals of the stacked cells is short, which is disadvantageous for connecting the electrode terminals. Summary of the Invention

[0003] In view of this, it is necessary to provide a battery pack and a power consuming device that can easily connect electrode terminals.

[0004] An embodiment of the present application provides a battery pack, the battery pack including a cell assembly and a connection member. The cell assembly includes M cells stacked along a first direction. Each cell includes a cell case, an electrode terminal, and an electrode assembly installed within the cell case. The electrode terminal is connected to the electrode assembly and extends from the cell case. A projection of a portion of the electrode terminal of one cell located outside the cell case along the first direction is spaced apart from a projection of a portion of the electrode terminal of an adjacent cell located outside the cell case in a second direction. The second direction is perpendicular to the first direction. The connection member includes N conductive pieces installed at intervals. The electrode terminals are connected to the conductive pieces. By arranging the electrode terminals of adjacent cells without overlapping in the first direction, the electrode terminals can be easily connected to other conductive members, reducing the risk of short-circuiting between adjacent electrode terminals.

[0005] Preferably, in some embodiments of the present application, the electrode terminals include a first terminal and a second terminal of opposite polarities, and the second terminal and the first terminal are arranged side by side in the second direction. The second terminal of any cell between the first cell and the Mth cell and the first terminal of the adjacent cell are connected to the same conductive piece to achieve a series connection.

[0006] Preferably, in some embodiments of the present application, the portion of the electrode terminal located outside the cell casing includes a connection portion, and N=1+M, where M≧3.

[0007] Preferably, in some embodiments of the present application, the connection member includes a first insulating member and a second insulating member, the plurality of spaced apart conductive pieces are located between the first insulating member and the second insulating member, and portions of the conductive pieces are exposed from the first insulating member and / or the second insulating member.

[0008] Preferably, in some embodiments of the present application, the conductive piece includes a first region. The first region includes a first surface and a second surface arranged along a third direction. The second surface faces the cell casing. The electrode terminal is connected to the first surface and / or the second surface, and various connection modes between the electrode terminal and the conductive piece can be provided, and the third direction is perpendicular to both the first direction and the second direction.

[0009] Preferably, in some embodiments of the present application, the first insulating member and the second insulating member are arranged side by side in the third direction. An opening is provided in the first insulating member and / or the second insulating member. A projection of the first region and a projection of the opening overlap along the third direction. The electrode terminal is connected to the first region.

[0010] Preferably, in some embodiments of the present application, a first opening is provided in the first insulating member, a second opening is provided in the second insulating member, and a first gap is provided between an edge of the first region and an edge of the first opening along the first direction. An electrode terminal extends from the first gap through the second opening and is connected to the first surface, which is advantageous for inspecting the quality of the weld.

[0011] Preferably, in some embodiments of the present application, there is an overlap between the projection of the first gap and the projection of the second opening along the third direction.

[0012] Preferably, in some embodiments of the present application, a second opening is provided in the second insulating member. A projection of the second opening and a projection of the first region overlap along the third direction. An electrode terminal is connected to the second surface, which is advantageous for improving automation efficiency.

[0013] Preferably, in some embodiments of the present application, a first opening is provided in the first insulating member, a second opening is provided in the second insulating member, some electrode terminals pass through the second openings and are connected to the first surface, and a projection of the second openings and a projection of the first region overlap along a third direction. Other electrode terminals are connected to the second surface, which is advantageous for inspecting the quality of the weld.

[0014] Preferably, in some embodiments of the present application, the conductive piece further includes a second region extending from the first insulating member and the second insulating member, and the second regions are spaced apart to facilitate welding of the second regions to other conductive members and reduce damage to the cell during the welding process.

[0015] Preferably, in some embodiments of the present application, the conductive piece further includes a third region, the third region being disposed between the first insulating member and the second insulating member, and the third region connecting the first region and the second region.

[0016] Preferably, in some embodiments of the present application, the third region includes a third sub-region. The third sub-region is curved towards the second insulating member along the second direction. The second region is connected to the third sub-region, further increasing the distance between adjacent second regions and further reducing the risk of short circuit due to the contact of adjacent second regions.

[0017] Preferably, in some embodiments of the present application, the edge of the electrode terminal and the edge of the first opening are installed at an interval, facilitating welding and reducing the interference between the connection part and the first insulating member.

[0018] Preferably, in some embodiments of the present application, the cell case includes a first part and a second part. The electrode terminal extends from the second part. The second part and the first part are connected to form a first recess. Along the first direction, the thickness of the first part is less than 6 mm.

[0019] Preferably, in some embodiments of the present application, along the first direction, the thickness of the first part is 2 mm to 4 mm.

[0020] Preferably, in some embodiments of the present application, it further includes a circuit board, and the second region is connected to the circuit board.

[0021] Preferably, in some embodiments of the present application, the electrode terminals of adjacent cells are installed at different positions of the cell case. Along the second direction, let the width of the first terminal be W1, the width of the second terminal be W2, the distance along the second direction between the opposing edges of the first terminal and the second terminal in one cell be W3, and the distance along the second direction between the opposing edges of the first terminal and the second terminal in another adjacent cell be W4, satisfying W1 + W2 + W4 < W3.

[0022] Preferably, in some embodiments of the present application, the electrode terminals of each cell are installed at the same position of the cell case. The cell case includes a first side and a second side that are arranged side by side in the second direction. Along the second direction, the distance between the first side and the second side is denoted as W, the distance between the edge of the first terminal close to the first side and the first side is denoted as F1, and the distance between the edge of the second terminal close to the second side and the second side is denoted as F2. The width of the first terminal is denoted as W1, the width of the second terminal is denoted as W2, and F1 + W1 < F2 and 2 * (F2 + W2) < W are satisfied.

[0023] Preferably, in some embodiments of the present application, along the second direction, the distance between the second terminals in adjacent cells is denoted as d, and d satisfies d = [W - F1 - F1 - 2 * (W1 + W2)] / 3. The first terminal and the second terminal in adjacent cells maintain approximately the same distance from each other in the second direction, reducing the probability of short - circuit occurrence and the risk of short - circuit when the thickness of the cell is small.

[0024] One embodiment of the present application further provides an electric power consumption device, and the electric power consumption device includes the battery pack in any of the above embodiments.

Brief Description of Drawings

[0025] [Figure 1] FIG. 1 shows a schematic structural view of a cell assembly and a connection member in some embodiments. [Figure 2] FIG. 2 shows an exploded schematic view of a cell assembly and a connection member in some embodiments. [Figure 3] FIG. 3 shows a schematic structural view of a cell in some embodiments. [Figure 4] FIG. 4 shows an exploded schematic view of a cell in some embodiments. [Figure 5] FIG. 5 shows a schematic structural view of a first group of cells in some embodiments. [Figure 6] FIG. 6 shows an exploded schematic view of a cell in some other embodiments. [Figure 7] FIG. 7 shows a schematic structural view of an electrode assembly in some embodiments. [Figure 8] FIG. 8 shows a structural schematic diagram of a cell assembly and an insulating member in some embodiments. [Figure 9] FIG. 9 shows a structural schematic diagram of a first group of cells and a second group of cells in some embodiments. [Figure 10] FIG. 10 shows a schematic front view of a cell structure in some embodiments. [Figure 11] FIG. 11 shows a schematic diagram of the structure after the cells in FIG. 10 are stacked. [Figure 12] FIG. 12 shows a schematic front view of the cell structure in some other embodiments. [Figure 13] FIG. 13 shows a schematic front view of the cell structure in some other embodiments. [Figure 14] FIG. 14 shows a schematic diagram of the structure after the cells shown in FIGS. 12 and 13 are stacked. [Figure 15] FIG. 15 shows a schematic front view of the cell structure after stacking in FIG. [Figure 16] FIG. 16 illustrates an exploded schematic view of a connecting member according to some embodiments. [Figure 17] FIG. 17 shows a schematic structural diagram of an electrode terminal connected to a connection member in some embodiments. [Figure 18] FIG. 18 shows a schematic structural view of the electrode terminals connected to the connection members in some other embodiments. [Figure 19] FIG. 19 shows a structural schematic diagram of the circuit board, bracket, cell assembly and connecting member in some embodiments. [Figure 20] FIG. 20 shows an exploded schematic view of the structure shown in FIG. [Figure 21] FIG. 21 illustrates an exploded schematic view of a battery pack according to some embodiments. [Figure 22] FIG. 22 illustrates a structural schematic diagram of a power consumer device in accordance with some embodiments. [Explanation of symbols]

[0026] Battery pack: 100, Cell Assembly: 10, Cells: 11, 11a1, 11a2, 11b1, 11b2, Cells of the first group: 11a, Cells of the second group: 11b, Cell case: 111, Part 1: 111a, Second part: 111b, First recess: 111c, Second recess: 111d, 1st side: 111e, Second side: 111f, First shell: 1111, Second shell: 1112, 1st extension: 1113, 2nd extension: 1114, 1st sealed part: 1115, 2nd sealed part: 1116, Electrode assembly: 112, 1st pole piece: 112a, 2nd pole piece: 112b, Separator: 112c, Electrode terminal: 113, Connection: 113a, 1st terminal: 113b, 1st edge: 1131, 2nd edge: 1132, 2nd terminal: 113c, Third edge: 1133, 4th edge: 1134, Insulating member: 12, Connecting members: 20, Through hole: 201, 1st opening: 20a, 2nd opening: 20b, First insulating member: 21, First gap: 21a, Second insulating member: 22, Conductive piece: 23, 1st area: 231, 1st surface: 231a, 1st extension area: 2312, 2nd surface: 231b, 2nd area: 232, Third area: 233, Third sub-region: 233a, Circuit board: 30, Second through hole: 31, Bracket: 40, First space: 40a, First through hole: 41, Buffer member: 50, Case: 60, First shell: 61, Second outer shell: 62, Power consumption equipment: 200, First direction: X, Second direction: Y, Third direction: Z.

[0027] The following specific examples further illustrate the present application with reference to the above-mentioned figures. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. However, it is clear that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments.

[0029] When a component is considered to be "mounted" on another component, it may be mounted directly on the other component, but it may also be co-existing with the other component. When a component is considered to be "connected" to another component, it may be connected directly to the other component, but it may also be co-existing with the other component.

[0030] It is understood that the terms "perpendicular" and "equal" are used to describe an ideal state between two parts. In actual manufacturing or use, two parts may be nearly perpendicular or perpendicular, but generally vary within a range of ±10%. For example, when describing perpendicularity based on numerical values, it indicates that the angle between two lines is in the range of 90°±10°, the dihedral angle between two planes is in the range of 90°±10°, and the angle between a line and a plane is in the range of 90°±10°. Two parts described as "perpendicular" do not need to be absolutely straight or flat, but can be approximately straight or flat. When viewed macroscopically, if the extension direction of the entire parts is straight or flat, they can be considered "straight" or "flat."

[0031] It is understood that the term "parallel" is used to describe an ideal state between two parts. In actual manufacturing or use, a nearly parallel state may exist between two parts. For example, when describing parallelism based on numerical values, it indicates that the angle between two lines is in the range of 180°±10°, the dihedral angle of both planes is in the range of 180°±10°, or the angle between a line and a plane is in the range of 180°±10°. Two parts described as "parallel" do not need to be absolutely straight or planar, but may be approximately straight or planar. From a macroscopic perspective, if the extension direction of the entire parts is straight or planar, they can be considered "straight" or "planar."

[0032] Unless otherwise stated, the term "plurality" as used herein when describing the number of parts specifically means two or more of those parts.

[0033] Unless otherwise stated, the meanings of all technical and scientific terms used herein are the same as those commonly understood by those skilled in the art. The terms used herein are intended only to describe specific embodiments and are not intended to limit the scope of the present application. The term "or / and" used herein includes any and all combinations of one or more of the associated listed items.

[0034] An embodiment of the present application provides a battery pack, the battery pack including a cell assembly and a connection member. The cell assembly includes M cells stacked along a first direction. Each cell includes a cell case, an electrode terminal, and an electrode assembly installed within the cell case. The electrode terminal is connected to the electrode assembly and extends from the cell case. A projection of a portion of the electrode terminal of one cell located outside the cell case along the first direction is spaced apart from a projection of a portion of the electrode terminal of an adjacent cell located outside the cell case in a second direction. The second direction is perpendicular to the first direction. The connection member includes N conductive pieces installed at intervals. The electrode terminals are connected to the conductive pieces. By arranging the electrode terminals of adjacent cells without overlapping in the first direction, the electrode terminals can be easily connected to other conductive members, reducing the risk of short-circuiting between adjacent electrode terminals.

[0035] Hereinafter, several embodiments of the present application will be described in detail with reference to the drawings. If not contradictory, the following aspects and features in the embodiments may be combined with each other.

[0036] 1, 2, 3, and 4, one embodiment of the present application provides a battery pack 100, the battery pack 100 including a cell assembly 10 and a connection member 20, the cell assembly 10 including M cells 11 stacked along a first direction X, each of the cells 11 including a cell case 111, an electrode terminal 113, and an electrode assembly 112 installed in the cell case 111, the electrode terminal 113 connected to the electrode assembly 112 and extending from the cell case 111. The electrode terminal 113 includes a first terminal 113b and a second terminal 113c, the first terminal 113b and the second terminal 113c being aligned along a second direction Y. The first terminal 113b and the second terminal 113c have opposite polarities, with one of the first terminal 113b and the second terminal 113c being a positive terminal and the other being a negative terminal, and in this specification, an example will be described in which the first terminal 113b is a positive terminal and the second terminal 113c is a negative terminal. Along the first direction X, a projection of a portion of the electrode terminal 113 of one cell 11 located outside the cell case 111 and a projection of a portion of the electrode terminal 113 of an adjacent cell 11 located outside the cell case 111 are spaced apart in the second direction Y, and each of the electrode terminals 113 is connected to the connection member 20. By arranging the electrode terminals 113 of adjacent cells 11 without overlapping in the first direction X, the risk of short-circuiting between the adjacent electrode terminals 113 is reduced, connection with the connecting member 20 is facilitated, and the need to place spacers such as foam cotton between the cell cases 111, which would increase the distance between the adjacent electrode terminals 113, is eliminated or can be reduced, which is advantageous for manufacturing a thin battery pack 100 and improving the energy density of the battery pack 100.

[0037] In one embodiment, the cell casing 111 includes a first portion 111a and a second portion 111b, where the first portion 111a houses the electrode assembly 112, the second portion 111b and the first portion 111a are connected to form a first recess 111c, and the electrode terminal 113 extends from the second portion 111b. Preferably, the cell casing 111 includes an aluminum plastic film. Preferably, the cell 11 includes a soft-pack cell.

[0038] In one embodiment, the thickness of the first portion 111a along the first direction X is less than 6 mm, which is advantageous for reducing the volume of the cell 11. Preferably, 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 may 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.

[0039] 4, 5, and 6, in one embodiment, the cell casing 111 includes a first outer shell 1111 and a second outer shell 1112, and the first outer shell 1111 is connected to the second outer shell 1112. One of the first outer shell 1111 and the second outer shell 1112 has a second recess 111d for placing the electrode assembly 112, and the other has a flat structure. The first outer shell 1111 and the second outer shell 1112 are foldable along the connection position (dotted line position), and the first outer shell 1111 and the second outer shell 1112 overlap to form a first portion 111a for covering the electrode assembly 112. The circumferential side of the first outer shell 1111 extends outward to form a plurality of first extensions 1113, and the circumferential side of the second outer shell 1112 extends outward to form a plurality of second extensions 1114. After the first outer shell 1111 and the second outer shell 1112 are folded along the connection position, the first extension portion 1113 and the second extension portion 1114 overlap and are hermetically connected to form the second portion 111b. Preferably, the first extension portion 1113 and the second extension portion 1114 are hermetically connected by a sealant. The second portion 111b includes a first sealing portion 1115 and a second sealing portion 1116, with the first sealing portion 1115 facing the connection position and the electrode terminal 113 extending from the first sealing portion 1115 to the first portion 111a. Preferably, the second portion 111b includes two second sealing portions 1116, which are arranged side by side in the second direction Y. The second direction Y is perpendicular to the first direction X. Preferably, the second portion 111b includes one first sealing portion 1115, and the cell 11 includes two electrode terminals 113, the two electrode terminals 113 extending from the first sealing portion 1115 to the cell casing 111. In another embodiment, the first outer shell 1111 and the second outer shell 1112 are spaced apart, the second portion 111b includes two first sealing portions 1115, the two first sealing portions 1115 being arranged side by side in the third direction Z, the cell 11 includes two electrode terminals 113, one electrode terminal 113 extending from one of the first sealing portions 1115 to the cell casing 111, and the other electrode terminal 113 extending from the other first sealing portion 1115 to the cell casing 111, the two electrode terminals 113 being arranged side by side in the third direction Z. The third direction Z is perpendicular to both the first direction X and the second direction Y.

[0040] By providing a second recess 111d in one of the first outer shell 1111 and the second outer shell 1112, the space of the first recess 111c can be increased. When the cells 11 are stacked, the first recesses 111c of adjacent cells 11 communicate with each other to further increase the space and increase the distance between the electrode terminals 113 of adjacent cells 11 along the first direction X, thereby reducing the risk of short-circuiting. In one embodiment, an insulating member 12 is provided in the first recess 111c and is provided between the first portion 111a and the connecting member 20, further reducing the risk of short-circuiting between the cell 11 and the connecting member 20. Preferably, the insulating member 12 includes foam cotton.

[0041] 6, in another embodiment, the cell casing 111 includes a first outer shell 1111 and a second outer shell 1112, and the first outer shell 1111 is connected to the second outer shell 1112. The first outer shell 1111 and the second outer shell 1112 each have a second recess 111d, a portion of the electrode assembly 112 is disposed in the second recess 111d of the first outer shell 1111, and a portion of the electrode assembly 112 is disposed in the second recess 111d of the second outer shell 1112, and first recesses 111c are disposed on both sides of the second portion 111b along the first direction X.

[0042] 7, in one embodiment, the electrode assembly 112 has a wound structure formed by stacking and winding a first pole piece 112a, a second pole piece 112b, and a separator 112c. In other embodiments, the electrode assembly 112 may have a stacked structure in which the first pole piece 112a, the separator 112c, and the second pole piece 112b are stacked in order, and the first pole piece 112a and the second pole piece 112b have opposite polarities.

[0043] In one embodiment, a portion of the electrode terminal 113 located outside the cell casing 111 includes a connecting portion 113a, which is used for welding to another conductive member. The connecting portion 113a is formed by bending the electrode terminal 113, and the connecting portion 113a is connected to the connecting member 20. The connecting portion 113a is provided on both the first terminal 113b and the second terminal 113c. In another embodiment, the connecting portion 113a may have a flat plate-like structure.

[0044] 5, 9, and 11, which are structural schematic diagrams showing a case where the electrode terminals 113 are not bent. The cell assembly 10 includes a first group of cells 11a and a second group of cells 11b, where the first group of cells 11a and the second group of cells 11b are arranged adjacent to each other. The first group of cells 11a includes two cells 11a1 and 11a2, and the second group of cells 11b includes two cells 11b1 and 11b2. The cells 11a1, 11a2, 11b1, and 11b2 are arranged in sequence along the first direction X. Projections of portions of the electrode terminals 113 of the cells 11 arranged adjacent to each other along the first direction X that are located outside the cell case 111 are spaced apart in the second direction Y.

[0045] In one embodiment, along the first direction X, a projection of a portion of the first terminal 113b of cell 11a2 located outside the cell casing 111, a projection of a portion of the second terminal 113c of cell 11a1 located outside the cell casing 111, a projection of a portion of the second terminal 113c of cell 11a2 located outside the cell casing 111, and a projection of a portion of the first terminal 113b of cell 11a1 located outside the cell casing 111 are arranged spaced apart from one another in the second direction Y. Along the first direction X, the projections of the portions of the two second terminals 113c located outside the cell casing 111 are located between the projections of the portions of the two first terminals 113b located outside the cell casing 111, which is advantageous for connecting the cells 11.

[0046] In one embodiment, along the first direction X, a projection of a portion of the first terminal 113b of cell 11b2 located outside the cell casing 111, a projection of a portion of the second terminal 113c of cell 11b1 located outside the cell casing 111, a projection of a portion of the second terminal 113c of cell 11b2 located outside the cell casing 111, and a projection of a portion of the first terminal 113b of cell 11b1 located outside the cell casing 111 are arranged spaced apart from one another in the second direction Y. Along the first direction X, the projections of the portions of the two second terminals 113c located outside the cell casing 111 are located between the projections of the portions of the two first terminals 113b located outside the cell casing 111, which is advantageous for connecting the cells 11.

[0047] In one embodiment, along the first direction X, a projection of a portion of the first terminal 113b of cell 11a2 located outside the cell casing 111, a projection of a portion of the second terminal 113c of cell 11b1 located outside the cell casing 111, a projection of a portion of the second terminal 113c of cell 11a2 located outside the cell casing 111, and a projection of a portion of the first terminal 113b of cell 11b1 located outside the cell casing 111 are arranged spaced apart from each other in the second direction Y. Along the first direction X, the projections of the portions of the two second terminals 113c located outside the cell casing 111 are located between the projections of the portions of the two first terminals 113b located outside the cell casing 111, which is advantageous for connecting the cells 11.

[0048] In the present application, by arranging the electrode terminals 113 of adjacent cells 11 so as not to overlap in the first direction X, the risk of short-circuiting due to contact between adjacent electrode terminals 113 is reduced by shifting nearby electrode terminals 113, and the need to place spacers between adjacent first portions 111a that increase the distance between adjacent electrode terminals 113 is eliminated or can be reduced, which is advantageous for manufacturing a thin battery pack 100 and improving the energy density of the battery pack 100. Furthermore, it is possible to add an arrangement mode of cells 11 having a structure in which one second recess 111d is provided only in the first portion 111a, which facilitates manufacturing.

[0049] In one embodiment, the first recess 111c of cell 11a1 is positioned opposite the first recess 111c of cell 11a2, and the first recess 111c of cell 11a1 is connected to the first recess 111c of cell 11a2, thereby providing more space for the connection portion 113a of cell 11a1 and the connection portion 113a of cell 11a2 and increasing the area of ​​the connection portion 113a.

[0050] In one embodiment, the first recess 111c of cell 11b1 is positioned opposite the first recess 111c of cell 11b2, and the first recess 111c of cell 11b1 is connected to the first recess 111c of cell 11b2, providing more space for the connection portion 113a of cell 11b1 and the connection portion 113a of cell 11b2, thereby increasing the area of ​​the connection portion 113a.

[0051] In one embodiment, the first recess 111c of the cell 11a2 and the first recess 111c of the cell 11b1 are spaced apart from each other, which is advantageous for connecting the electrode terminal 113.

[0052] In one embodiment, the cell casing 111 includes a first side edge 111e and a second side edge 111f arranged side by side in the second direction Y. The distance between the first side edge 111e and the second side edge 111f along the second direction Y is the width W of the cell 11. The first terminal 113b includes a first edge 1131 and a second edge 1132 arranged side by side in 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. The distance between the first edge 1131 and the first side edge 111e along the second direction Y is defined as F1. The second terminal 113c includes a third edge 1133 and a fourth edge 1134 arranged side by side in the second direction Y. 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. The distance between the fourth edge 1134 and the second side edge 111f along the second direction Y is F2. Here, F1 is less than F2, and F1+W1 <F2かつ2*(F2+W2)<Wである。

[0053] 11 is a schematic diagram showing a case where two cells 11 are stacked and the electrode terminals 113 are not bent. Taking the first group of cells 11a as an example, the electrode terminals 113 of cells 11a1 and 11a2 are located at the same positions. When viewed along the first direction X, the first terminal 113b of cell 11a2, the second terminal 113c of cell 11a1, the second terminal 113c of cell 11a2, and the first terminal 113b of cell 11a1 are located spaced apart in sequence along the second direction Y. 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, and is given by d = [W-F1-F1-2*(W1+W2)] / 3. When viewed along the first direction X, the distance between the opposing edges of the first terminal 113b of cell 11a2 and the second terminal 113c of cell 11a1 along the second direction Y is d1, and the distance between the opposing edges of the first terminal 113b of cell 11a1 and the second terminal 113c of cell 11a2 is d2, where d=d1=d2, or d1 and d2 are approximately equal to d, so that the first terminals 113b and second terminals 113c of adjacent cells 11 maintain approximately the same distance from each other in the second direction Y, and when the thickness of the cells 11 is thin, the probability of short circuit occurrence is reduced, and the risk of short circuiting is reduced.

[0054] 12 to 15, which are structural schematic diagrams showing a case where the electrode terminals 113 are not bent. Taking the first group of cells 11a as an example, the electrode terminals 113 of cells 11a1 and 11a2 are installed at different positions. The distance between the first edge 1131 and the first side edge 111e of cell 11a1 along the second direction Y is defined as F. 11 The distance between the fourth edge 1134 and the second side edge 111f in the second direction Y is F. 12 and the distance between the second edge 1132 and the third edge 1133 along the second direction Y is W3, where 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 cell 11a2 along the second direction Y is F. 21The distance between the fourth edge 1134 and the second side edge 111f in the second direction Y is F. 22 and the distance between the second edge 1132 and the third edge 1133 along the second direction Y is W4, where F 21 =F 22 and W4>F 21 , W4>F 22 , F 11 >F 21 , W1+W2+W3 <W4である。

[0055] 15 is a schematic diagram showing a case where the electrode terminals 113 are not bent after the cells 11 are stacked, and will be described using the first group of cells 11a as an example. Along the first direction X, a projection of a portion of the first terminal 113b of cell 11a2 positioned outside the cell casing 111, a projection of a portion of the second terminal 113c of cell 11a1 positioned outside the cell casing 111, a projection of a portion of the first terminal 113b of cell 11a1 positioned outside the cell casing 111, and a projection of a portion of the second terminal 113c of cell 11a2 positioned outside the cell casing 111 are arranged spaced apart sequentially in the second direction Y. Along the first direction X, the projection of the portion of the first terminal 113b located outside the cell case 111 in cell 11a1 and the projection of the portion of the second terminal 113c located outside the cell case 111 are located between the projection of the portion of the first terminal 113b located outside the cell case 111 in cell 11a2 and the projection of the portion of the second terminal 113c located outside the cell case 111, and the first terminal 113b in cell 11a2 is close to the second terminal 113c in cell 11a1. Along the second direction Y, the distance d1 between the first terminal 113b in cell 11a2 and the second terminal 113c in cell 11a1, and the distance d2 between the first terminal 113b in cell 11a1 and the second terminal 113c in cell 11a2 are equal to or approximately equal to the distance d(W3) between the first terminal 113b and the second terminal 113c in cell 11a1, so that the first terminals 113b and second terminals 113c of adjacent cells 11 maintain approximately the same distance from each other in the second direction Y, reducing the probability of short circuit occurrence and the risk of short circuit when the thickness of the cell 11 is thin.

[0056] 18 , in one embodiment, in two cells 11 that are installed adjacent to each other along the first direction X, the projections of the connection portions 113a of the two cells 11 that are installed adjacent to each other along the first direction X are spaced apart in the second direction Y. Along the first direction X, the projection of the connection portion 113a of the first terminal 113b of cell 11a2, the projection of the connection portion 113a of the second terminal 113c of cell 11a1, the projection of the connection portion 113a of the second terminal 113c of cell 11a2, and the projection of the connection portion 113a of the first terminal 113b of cell 11a1 are installed so as to be spaced apart sequentially in the second direction Y. Along the first direction X, the projections of the connection portions 113a of the two second terminals 113c are located between the projections of the connection portions 113a of the two first terminals 113b, which is advantageous for connecting the cells 11.

[0057] In one embodiment, in two cells 11 installed adjacent to each other along the first direction X, the projections of the connection portions 113a of the two cells 11 installed adjacent to each other along the first direction X are spaced apart in the second direction Y. Along the first direction X, the projection of the connection portion 113a of the first terminal 113b of cell 11b2, the projection of the connection portion 113a of the second terminal 113c of cell 11b1, the projection of the connection portion 113a of the second terminal 113c of cell 11b2, and the projection of the connection portion 113a of the first terminal 113b of cell 11b1 are installed spaced apart sequentially in the second direction Y. Along the first direction X, the projections of the connection portions 113a of the two second terminals 113c are located between the projections of the connection portions 113a of the two first terminals 113b, which is advantageous for connecting the cells 11.

[0058] In one embodiment, in two cells 11 installed adjacent to each other along the first direction X, the projections of the connection portions 113a of the two cells 11 installed adjacent to each other along the first direction X are spaced apart in the second direction Y. Along the first direction X, the projection of the connection portion 113a of the first terminal 113b of cell 11a2, the projection of the connection portion 113a of the second terminal 113c of cell 11b1, the projection of the connection portion 113a of the second terminal 113c of cell 11a2, and the projection of the connection portion 113a of the first terminal 113b of cell 11b1 are installed spaced apart sequentially in the second direction Y. Along the first direction X, the projections of the connection portions 113a of the two second terminals 113c are located between the projections of the connection portions 113a of the two first terminals 113b, which is advantageous for connecting the cells 11.

[0059] 2 and 16 , the connection member 20 includes a first insulating member 21, a second insulating member 22, and N conductive pieces 23 spaced apart between the first insulating member 21 and the second insulating member 22. Preferably, N=1+M, where M≧3. The first insulating member 21 and the second insulating member 22 are arranged side by side in the third direction Z. A portion of each conductive piece 23 is exposed from the first insulating member 21 and / or the second insulating member 22, and an electrode terminal 113 is connected to the conductive piece 23. Preferably, the connection portion 113a is connected to the conductive piece 23. In one embodiment, to achieve a series connection, the second terminal 113c of any cell located between the first cell and the Mth cell and the first terminal 113b of the adjacent cell 11 are connected to the same conductive piece 23. In another embodiment, the adjacent cells 11 may be connected in parallel. The electrode terminal 113 may be connected to the conductive piece 23 by welding, and preferably, the electrode terminal 113 is connected to the conductive piece 23 by laser welding. Preferably, the electrode terminal 113 is connected to the conductive piece 23 by ultrasonic welding. In one embodiment, the conductive piece 23 includes a first region 231, which is exposed from the first insulating member 21 and / or the second insulating member 22, and a projection of the first region 231 and a projection of the electrode terminal 113 overlap along the third direction Z. Preferably, a projection of the first region 231 and a projection of the connection portion 113a overlap along the third direction Z, and at least a portion of the first region 231 is connected to the connection portion 113a. Preferably, along the third direction Z, the projection of the connection portion 113a is located within the projection of the first region 231, so that the area for welding of the first region 231 exceeds the area of ​​the connection portion 113a, making welding easier and reducing the situation where part of the connection portion 113a is not connected to the first region 231.

[0060] In one embodiment, the first insulating member 21 and the second insulating member 22 are flexible, which improves toughness and reduces tension during vibration, for example, tension on the electrode terminal 113, thereby reducing the risk of the electrode terminal 113 coming off the first region 231.

[0061] 1, 2, and 16, in one embodiment, the first region 231 includes a first surface 231a and a second surface 231b disposed along the third direction Z, with the second surface 231b being closer to the cell casing 111 than the first surface 231a. A first opening 20a is disposed in the first insulating member 21, and a second opening 20b is disposed in the second insulating member 22. The projections of the first openings 20a and the second openings 20b overlap along the third direction Z. The number of the first openings 20a is the same as the number of the conductive pieces 23, and the number of the second openings 20b is the same as the number of the conductive pieces 23. Since the projection of at least a portion of the first region 231 is located within the projection of the first openings 20a along the third direction Z, a first gap 21a is formed between the edge of the first region 231 and the edge of the first opening 20a. The electrode terminal 113 passes through the second opening 20b and the first gap 21a, and is bent and then connected to the first surface 231a. The entire connecting portion 113a is welded to the first surface 231a, which is advantageous for inspecting the quality of the weld. Preferably, the first terminal 113b includes a conductive aluminum sheet, the second terminal 113c includes a conductive copper sheet, and the first region 231 includes a conductive copper sheet. Preferably, the conductive piece 23 includes a first extending region 2312. The first extending region 2312 extends outward from the edge of the first region 231, and the first insulating member 21 covers the first extending region 2312 for connection to the edge of the first opening 20a.

[0062] Preferably, along the third direction Z, the projection of the second opening 20b is located within the projection of the first opening 20a, the projection of the first gap 21a and the projection of the second opening 20b overlap, and the projection of the second opening 20b and the projection of the first region 231 are spaced apart, so that the second insulating member 22 covers the second surface 231b and only the first surface 231a is exposed, thereby reducing the risk of short circuits. Preferably, the edge of the connecting portion 113a and the edge of the first opening 20a are spaced apart, which facilitates welding and reduces interference between the connecting portion 113a and the first insulating member 21.

[0063] 16 and 17 , in one embodiment, the first region 231 includes a first surface 231a and a second surface 231b arranged along the third direction Z, and the first insulating member 21 covers the first surface 231a. The second insulating member 22 has second openings 20b, and the number of second openings 20b is the same as the number of conductive pieces 23. When viewed in the direction opposite the third direction Z, the projections of the second openings 20b and the projections of the first region 231 overlap, and the second surface 231b is located within the second openings 20b. The connecting portion 113a is connected to the second surface 231b. By welding the entire connecting portion 113a to the second surface 231b, automation efficiency can be improved. Preferably, the first terminal 113b includes a conductive aluminum sheet, the second terminal 113c includes a conductive copper sheet, and the first region 231 includes a conductive copper sheet. Preferably, the conductive piece 23 includes a first extension region 2312. The first extension region 2312 is formed to extend outward from the edge of the first region 231, and the second insulating member 22 covers the first extension region 2312 for connection to the edge of the second opening 20b.

[0064] Preferably, the edge of the connecting portion 113a and the edge of the second opening 20b are spaced apart to facilitate welding and reduce interference between the connecting portion 113a and the first insulating member 21.

[0065] Preferably, along the third direction Z, there is an overlap between the projection of the peripheral edge of the second opening 20b and the projection of the first region 231, which reduces the gap between the first region 231 and the second opening 20b, thereby eliminating the need to pass the electrode terminal 113 through the second opening 20b, thereby reducing the area of ​​the second opening 20b and reducing the risk of short circuiting.

[0066] 16 and 18 , in one embodiment, the first region 231 includes a first surface 231a and a second surface 231b disposed along the third direction Z. A first opening 20a is disposed in the first insulating member 21, and a second opening 20b is disposed in the second insulating member 22. When viewed along the third direction Z, the first surface 231a of the first region 231 is located within the first opening 20a. When viewed in the opposite direction to the third direction Z, the second surface 231b of the first region 231 is located within a portion of the second opening 20b, and a portion of the second opening 20b is used to pass the electrode terminals 113. Some of the electrode terminals 113 pass through the second opening 20b and the first opening 20a and are connected to the first surface 231a, and other portions of the electrode terminals 113 are connected to the second surface 231b. Preferably, the first terminal 113b is connected to the first surface 231a through the second opening 20b and the first opening 20a, and the second terminal 113c is connected to the second surface 231b, which is convenient for manufacturing. Preferably, the first terminal 113b comprises a conductive aluminum sheet, the second terminal 113c comprises a conductive copper sheet, and the first region 231 comprises a conductive copper sheet. Installing the first terminal 113b on the first surface 231a is convenient for inspecting the quality of the welding and specific conditions of the welding.

[0067] In one embodiment, the welding includes laser welding, ultrasonic welding, etc. In other embodiments, the connecting portion 113a and the first region 231 may be connected by other connecting methods, such as a conductive adhesive.

[0068] 1, 16, and 19, in one embodiment, the conductive piece 23 further includes a second region 232 extending from the first insulating member 21 and the second insulating member 22 for connection with other conductive members. The second regions 232 are spaced apart along the second direction Y, facilitating welding between the second regions 232 and other conductive members and reducing damage to the cell during the welding process. Preferably, the second regions 232 are connected to the circuit board 30 to connect the cell 11 to the circuit board 30 and also to collect voltage, thereby reducing the need for sampling terminals and voltage collection harnesses and the number of components. Preferably, the circuit board 30 includes a BMS (Battery Management System) component. Specifically, the BMS component includes multiple electronic components that can perform functions such as data collection, control, protection, communication, power calculation, signal transmission, and power transmission for the battery. Preferably, the circuit board 30 includes a flexible printed circuit (FPC). Preferably, the circuit board 30 includes a printed circuit board (PCB), and a plurality of conductors (not shown) are provided on the circuit board 30. Preferably, the second region 232 is connected to the circuit board 30 by welding.

[0069] In one embodiment, the conductive piece 23 further includes a third region 233, which connects the first region 231 and the second region 232. The first insulating member 21 and the second insulating member 22 cover the third region 233 to insulate the third region 233, reduce the number of components, and position the multiple conductive pieces 23, thereby reducing the risk of short circuits caused by contact between the multiple conductive pieces 23.

[0070] 1 and 16, in one embodiment, at least a portion of the third region 233 is curved, thereby further increasing the distance between adjacent second regions 232, further reducing the risk of short circuits due to contact between adjacent second regions 232, and further facilitating welding of the second regions 232 to the circuit board 30, thereby further reducing damage to the cells 11 during the welding process.

[0071] In one embodiment, at least a portion of the third region 233 of the conductive piece 23 includes a third sub-region 233a, which curves toward the second insulating member 22 along the second direction Y, and the second region 232 is connected to the third sub-region 233a.

[0072] 1 and 2, when manufacturing the connection member 20, a sheet material is first continuously punched using a press to form a plurality of conductive pieces 23. The sheet material from which the plurality of conductive pieces 23 are formed has a first connecting band (not shown) and a second connecting band (not shown), which are continuous along the length of the sheet material. The formed plurality of conductive pieces 23 are connected to the first connecting band and the second connecting band, thereby positioning the formed plurality of conductive pieces 23 between the first connecting band and the second connecting band. Then, the first insulating member 21 and the second insulating member 22 respectively cover the plurality of conductive pieces 23 along the third direction Z. The first connecting band and the second connecting band of the sheet material are cut to separate the plurality of conductive pieces 23, thereby realizing the plurality of conductive pieces 23 being spaced apart. In one embodiment, after the first and second connecting bands of the sheet material are cut, some conductive pieces 23 are still connected, and the connecting portion of the two conductive pieces 23 and the first insulating member 21 and the second insulating member 22 covering the connecting portion are punched out to cut the conductive pieces 23 that are connected to each other, and a through hole 201 is formed in the connecting member 20.

[0073] 20 and 21 , in one embodiment, the battery pack 100 further includes a bracket 40, and the cell assembly 10 and the circuit board 30 are mounted on opposite sides of the bracket 40 in the first direction X. A first through-hole 41 is formed in the bracket 40, and a projection of a second region 232 is positioned within the projection of the first through-hole 41 in the first direction X. A plurality of second through-holes 31 are formed in the circuit board 30, and the second region 232 is mounted in the second through-holes 31 passing through the first through-holes 41, and the second region 232 is fixedly connected to the circuit board 30 by a method such as welding or a conductive adhesive.

[0074] In one embodiment, a first space 40a is installed in the bracket 40, and the cell assembly 10 is installed in the first space 40a. Preferably, an insulating buffer member 50 is installed between the cell assembly 10 and the inner wall of the first space 40a, and is used to fix the position of the cell assembly 10 and buffer the cell assembly 10. Preferably, the buffer member 50 includes foam cotton.

[0075] In one embodiment, the battery pack 100 further includes a case 60, which includes a first outer shell 61 and a second outer shell 62, and the first outer shell 61 and the second outer shell 62 are connected to each other, thereby accommodating the cell assembly 10, the connecting member 20, the circuit board 30, and the bracket 40 within the first outer shell 61 and the second outer shell 62.

[0076] 22 , the present application further provides a power consumption device 200 using the above-described battery pack 100. In one embodiment, the power consumption 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 assist bicycle, a power tool, or a large household battery.

[0077] Those skilled in the art will understand that the above examples are merely for illustrating the present application and are not intended to limit the present application, and that any appropriate modifications and variations to the above examples within the substantial spirit of the present application are included within the scope of the disclosure of the present application.

Claims

1. A battery pack including a cell assembly and a connecting member; the cell assembly includes M cells stacked and installed along a first direction, each of the cells includes a cell case, an electrode terminal, and an electrode assembly installed in the cell case, the electrode terminal is connected to the electrode assembly and extends from the cell case, a projection of a portion of the electrode terminal of any one of the cells located outside the cell case along the first direction and a projection of a portion of the electrode terminal of an adjacent cell located outside the cell case are spaced apart in a second direction, the second direction being perpendicular to the first direction, The battery pack, wherein the connection member includes N conductive pieces spaced apart, and the electrode terminals are connected to the conductive pieces.

2. 2. The battery pack according to claim 1, wherein the electrode terminals include a first terminal and a second terminal of opposite polarities, the second terminal and the first terminal are arranged side by side in the second direction, and the second terminal of any of the cells located between a first cell and an Mth cell and the first terminal of the adjacent cell are connected to the same conductive piece.

3. 3. The battery pack according to claim 2, wherein the portion of the electrode terminal located outside the cell case includes a connection portion, and N=1+M, M≧3 is satisfied.

4. The battery pack of any one of claims 1 to 3, characterized in that the connecting member includes a first insulating member and a second insulating member, the plurality of conductive pieces spaced apart are positioned between the first insulating member and the second insulating member, and a portion of the conductive pieces is exposed from the first insulating member and / or the second insulating member.

5. 5. The battery pack of claim 4, wherein the conductive piece includes a first region, the first region includes a first surface and a second surface arranged along a third direction, the second surface faces the cell casing, 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. 6. The battery pack of claim 5, wherein the first insulating member and the second insulating member are arranged side by side in the third direction, an opening is provided in the first insulating member and / or the second insulating member, a projection of the first region and a projection of the opening overlap along the third direction, and the electrode terminal is connected to the first region.

7. 7. The battery pack according to claim 6, wherein a first opening is provided in the first insulating member, a second opening is provided in the second insulating member, a first gap is provided between an edge of the first region and an edge of the first opening along the first direction, and 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 a projection of the first gap and a projection of the second opening overlap along the third direction.

9. 7. The battery pack according to claim 6, wherein a second opening is provided in the second insulating member, a projection of the second opening and a projection of the first area overlap along the third direction, and the electrode terminal is connected to the second surface.

10. 7. The battery pack according to claim 6, wherein a first opening is provided in the first insulating member, a second opening is provided in the second insulating member, some of the electrode terminals pass through the second opening and are connected to the first surface, a projection of the second opening and a projection of the first area overlap along the third direction, and other of the electrode terminals are connected to the second surface.

11. 7. The battery pack of claim 6, wherein the conductive piece further includes a second region, the second region extending from the first insulating member and the second insulating member, and a plurality of the second regions are spaced apart.

12. 12. The battery pack of claim 11, wherein the conductive piece further includes a third region, the third region being disposed between the first insulating member and the second insulating member, and the third region connecting the first region and the second region.

13. 8. The battery pack according to claim 7, wherein an edge of the electrode terminal and an edge of the first opening are spaced apart.

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

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

16. The battery pack according to claim 11 , further comprising a circuit board, wherein the second region is connected to the circuit board.

17. The electrode terminals of the adjacent cells are installed at different positions on the cell case, and the width of the first terminal is set to W along the second direction. １ and the width of the second terminal is W ２ and the distance between the opposing edges of the first terminal and the second terminal of one of the cells along the second direction is W ３ and the distance between the opposing edges of the first terminal and the second terminal of another adjacent cell is W ４ And W １ +W ２ +W ３ <W ４ 3. The battery pack according to claim 2, wherein the following is satisfied:

18. The electrode terminals of each of the cells are installed at the same position of the cell case, and the cell case includes a first side edge and a second side edge that are arranged side by side in the second direction. A distance between the first side edge and the second side edge along the second direction is W, and a distance between an edge of the first terminal that is close to the first side edge and the first side edge is F. １ and the distance between the edge of the second terminal close to the second side edge and the second side edge is F ２ and the width of the first terminal is W １ and the width of the second terminal is W ２ Then, F １ +W １ <F ２ and 2*(F ２ +W ２ 3. The battery pack according to claim 2, wherein W is satisfied.

19. The distance between the second terminals of the adjacent cells along the second direction is defined as d, and d is expressed as d=[W−F １ -F １ -2*(W １ +W ２ 19. The battery pack according to claim 18, wherein the battery pack satisfies the following:

20. A power consuming device, comprising the battery pack according to any one of claims 1 to 19.

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