Battery pack and its cell series connection element

Abstract

To provide a cell series connection element.SOLUTION: A cell series connection element includes a multi-layer structure and two fixing members. The multi-layer structure includes a plurality of metal sheets arranged in a stack, with a gap between any two adjacent metal sheets. The two fixing members are used to clamp and fix both ends of the multi-layer structure, and are electrically connected to the electrode terminals of the cells, respectively.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present disclosure relates to a battery pack and its cell series connection element.

Background Art

[0002] Conventionally, a plurality of cells of a battery pack have been connected in series using flat metal plates. When the battery pack operates, in addition to the cells generating heat, the flat metal plates also generate heat due to the flow of current, and the heated flat metal plates may further increase the temperature of the cells, raising safety concerns.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of this, an object of the present disclosure is to propose an improved battery pack and cell series connection element in order to solve the above problems of the prior art.

Means for Solving the Problems

[0004] According to some embodiments of the present disclosure, a cell series connection element includes a multi-layer structure including a plurality of first metal sheets stacked with a gap between any two adjacent first metal sheets, and two fixing members that fix and sandwich both ends of the multi-layer structure and are electrically connected to the electrode terminals of the cells, respectively.

[0005] In one or more embodiments of the present disclosure, the fixing member includes a second metal sheet, the second metal sheet is bent to form a recess, and the ends of the first metal sheets are inserted into the recess.

[0006] In one or more embodiments of the present disclosure, the thickness of the second metal sheet is greater than the thickness of each first metal sheet.

[0007] In one or more embodiments of the present disclosure, the hardness of the material of the second metal sheet is greater than the hardness of the material of each first metal sheet.

[0008] In one or more embodiments of the present disclosure, each first metal sheet includes a first planar segment, a second planar segment, and an intermediate segment. The first and second planar segments are separated from each other, and the intermediate segment is located between the first and second planar segments and has a different height from the first and second planar segments. Two fixing members clamp the first and second planar segments, respectively.

[0009] In one or more embodiments of the present disclosure, each first metal sheet further includes a first bevel segment and a second bevel segment, the first bevel segment being connected between a first planar segment and an intermediate segment, and the second bevel segment being connected between a second planar segment and an intermediate segment. Multiple first metal sheets are bent one by one at the first bevel segment and the second bevel segment so as to form a gap between the intermediate segments of any two adjacent first metal sheets.

[0010] In one or more embodiments of the present disclosure, the first metal sheet includes adjacent third and fourth metal sheets. The third metal sheet includes an intermediate segment, and the fourth metal sheet has a notch and a folded edge extending from the edge of the notch, the folded edge being bent toward the third metal sheet and in contact with the intermediate segment of the third metal sheet.

[0011] In one or more embodiments of the present disclosure, the first metal sheet includes adjacent third and fourth metal sheets. The third metal sheet includes a planar region, and the fourth metal sheet includes a bent portion, the bent portion of which is raised toward the third metal sheet and in contact with the planar region of the third metal sheet.

[0012] In one or more embodiments of the present disclosure, the first metal sheet includes adjacent third and fourth metal sheets, the third metal sheet being located below the fourth metal sheet. The ends of the third metal sheet and the ends of the fourth metal sheet overlap, and the length of the third metal sheet is less than the length of the fourth metal sheet.

[0013] According to some embodiments of the present disclosure, a battery pack includes a housing, a plurality of cells provided within the housing and each including a positive terminal and a negative terminal, arranged in at least one row along one direction, wherein the positive terminals of cells located in the same row are aligned with each other in the direction in which the cells are arranged, and the negative terminals of cells located in the same row are aligned with each other, and each of the plurality of cell series connection elements includes a multilayer structure and two fixing members, wherein the multilayer structure includes a plurality of stacked first metal sheets with a gap between any two adjacent first metal sheets, and the two fixing members fix and clamp both ends of the multilayer structure and are electrically connected to the positive terminals and negative terminals of two adjacent cells, respectively.

[0014] In one or more embodiments of the present disclosure, the housing has a first side opening and a second side opening, the first and second side openings being located on opposite sides of the housing and facing the cell series connection elements. [Effects of the Invention]

[0015] As described above, this disclosure provides a cell series connection element for connecting multiple cells in a battery pack in series, the cell series connection element comprising a multilayer structure, the multilayer structure comprising multiple stacked metal sheets with a gap between any two adjacent metal sheets. The installation of the multilayer structure can prevent overheating of the cell series connection element itself, and the cell series connection element can also be used as a heat sink coupled to the cells of the cell series connection element to help cool down the heated cells. [Brief explanation of the drawing]

[0016] To make the above and other purposes, features, advantages and embodiments of this disclosure clearer and easier to understand, the accompanying drawings are described below. [Figure 1] This is a perspective view of an energy storage cabinet according to one embodiment of the present disclosure. [Figure 2] Figure 1 is a perspective view of one battery pack in the energy storage cabinet shown. [Figure 3] Figure 2 is a plan view of the battery pack, in which the series-connected cell elements have been removed. [Figure 4] Figure 2 is a magnified view of the series connection elements of the battery pack cells shown. [Figure 5] Figure 4 is a partially enlarged side view of the cell series connection element shown. [Figure 6] Figure 2 shows the series connection elements and cells of the battery pack shown in Figure 2. [Figure 7] This is a perspective view of a cell series connection element according to another embodiment of the present disclosure. [Figure 8] This is a perspective view of a cell series connection element according to another embodiment of the present disclosure. [Figure 9] This is a schematic side view of a cell series connection element according to another embodiment of the present disclosure. [Modes for carrying out the invention]

[0017] To provide a more detailed and complete description of this disclosure, reference may be made to the accompanying drawings and the various embodiments described below. Each element in the drawings is not depicted proportionally and is provided solely for illustrative purposes of this disclosure. While many practical details are described below to provide a complete understanding of this disclosure, those skilled in the art should understand that this disclosure can be implemented without one or more of these practical details, and therefore these details are not used to limit this disclosure.

[0018] Please refer to FIG. 1. FIG. 1 is a perspective view of an energy storage cabinet 20 according to an embodiment of the present disclosure. The energy storage cabinet 20 includes a bracket 22 and one or more battery packs 21 provided on the bracket 22. The bracket 22 is used to place the battery pack 21. The bracket 22 has one or more slots, and each slot is used to accommodate one battery pack 21. The battery pack 21 is provided to be insertable into and removable from the slot of the bracket 22, that is, the battery pack 21 can be inserted into the slot and pulled out from the slot according to needs (for example, when repair or maintenance is required). The battery pack 21 is connected to a slide rail structure (not shown) of the bracket 22 so that it can slide into or out of the slot.

[0019] As shown in FIG. 1, a plurality of battery packs 21 are stacked along the vertical direction. The plurality of battery packs 21 can be divided into a plurality of layer assemblies 23 (floor assembly), and the battery packs 21 located in the same horizontal layer belong to the same layer assembly 23. In the illustrated embodiment, the energy storage cabinet 20 includes nine layer assemblies 23, and one layer assembly 23 is shown by a dashed line frame in the figure. The plurality of battery packs 21 in each layer assembly 23 are connected in series so that the voltages of the plurality of battery packs 21 in the layer assembly 23 can be added to output a larger voltage. Each layer assembly 23 may include one common anode and one common cathode.

[0020] As shown in FIG. 1, the energy storage cabinet 20 further includes a connection device 26 (junction device), which is provided on the bracket 22 and located on one side of the energy storage cabinet 20, and is connected to the common positive electrode and the common negative electrode (not shown) of each layer assembly 23. The connection device 26 includes a DC electrical connection unit (DC junction unit), an AC electrical auxiliary unit (AC auxiliary unit), and one or more control units (or one or more switch units).

[0021] As shown in FIG. 1, the energy storage cabinet 20 further includes a cooling device 28, which is provided on the bracket 22 and located on the other side of the energy storage cabinet 20. The cooling device 28 is used to output cold air to assist in reducing the temperature of the battery pack 21. The cooling device 28 is, for example, an air conditioning system. In some embodiments, the connection device 26 and the cooling device 28 are provided on opposite sides of the battery pack 21.

[0022] Please refer to FIG. 2. FIG. 2 is a perspective view of one battery pack 21 of the energy storage cabinet 20 shown in FIG. 1. In FIG. 2, for the purpose of explaining the elements, the upper cover of the battery pack 21 is removed. The battery pack 21 includes a housing 29 and a plurality of cells 12 provided in the housing 29. The cells 12 are, for example, lithium batteries. The cells 12 may be prismatic cells or pouch type cells. The cells 12 are arranged in at least one row along the direction D. In the shown embodiment, the battery pack 21 includes 48 cells 12 arranged in 4 rows with 12 cells per row.

[0023] As shown in Figure 2, each cell 12 includes two electrode terminals 15 arranged in parallel, including one positive terminal 13 and one negative terminal 14. The battery pack 21 further includes a plurality of first cell series connection elements 30, also called busbar elements, which are provided within the housing 29 and configured to be connected in series with the cells 12. Specifically, the first cell series connection elements 30 are electrically connected to the positive terminals 13 and negative terminals 14 of two adjacent cells 12 located in the same row. In some embodiments, the battery pack 21 further includes at least one second cell series connection element 40, which are provided within the housing 29 and electrically connected to the electrode terminals 15 of two adjacent rows of cells 12.

[0024] In the embodiments shown, the electrode terminals 15 of cell 12 are located at the top of cell 12, and the first cell series connection element 30 and the second cell series connection element 40 are provided above cell 12 and in contact with the electrode terminals 15 of cell 12. The first cell series connection element 30 and the second cell series connection element 40 may be made of a conductive material, such as copper or a copper alloy. The first cell series connection element 30 and the second cell series connection element 40 may be fixed to the electrode terminals 15 of cell 12, for example, by laser welding or screw fastening. In some embodiments, the length of the second cell series connection element 40 is shorter than the length of the first cell series connection element 30.

[0025] As shown in Figure 2, each first cell series connection element 30 includes a multilayer structure 31 and two fixing members 32. The multilayer structure 31 has one or more gaps, and the two fixing members 32 fix and clamp both ends of the multilayer structure 31 and are electrically connected to the electrode terminals 15 of two different cells 12. One fixing member 32 of the first cell series connection element 30 is connected to the positive terminal 13 of one cell 12, and the other fixing member 32 is connected to the negative terminal 14 of the other cell 12. In addition to allowing current to flow through the cells 12, the multilayer structure 31 also has a heat dissipation function. Specifically, the multilayer design of the multilayer structure 31 provides an increased surface area, allowing thermal energy to dissipate rapidly. By installing the multilayer structure 31, overheating of the first cell series connection element 30 itself can be avoided, and the first cell series connection element 30 can also act as a heat sink coupled to the cells 12 of the first cell series connection element 30, assisting in the cooling of the heated cells 12. In some embodiments, the second cell series connection element 40 also includes a multilayer structure and two fixing members, the structure of which is similar to the multilayer structure 31 and two fixing members 32 of the first cell series connection element 30.

[0026] As shown in Figure 2, the housing 29 of the battery pack 21 has at least one first side opening 41 and at least one second side opening 42, the first side opening 41 and the second side opening 42 being located on opposite sides of the housing 29 and facing the first cell series connection element 30. In some embodiments, the housing 29 includes two opposing side walls, the first side opening 41 and the second side opening 42 being opened in the two opposing side walls of the housing 29, and the upper edges of the first side opening 41 and the upper edges of the second side opening 42 being located on the top surface of the cell 12 (i.e., the surface of the cell 12 on which the electrode terminals 15 are installed). The first side opening 41 and the second side opening 42 can be used for airflow (for example, cold air generated by the cooling device 28 shown in Figure 1) to pass through. That is, the height of the first side opening 41 and the second side opening 42 is close to the height of the first cell series connection element 30. For example, airflow enters the housing 29 through the first side opening 41, passes over the cell 12, through the multilayer structure 31 of the first cell series connection element 30, and leaves the housing 29 through the second side opening 42, thereby improving heat dissipation efficiency through convection.

[0027] In some embodiments, the energy storage cabinet 20 has a fire-fighting mechanism to respond to situations where the cell 12 fails and the temperature runs out or ignites. The energy storage cabinet 20 is configured to inject a cooling liquid (e.g., pure water) into the housing 29 of the battery pack 21 when it detects overheating of the battery pack 21. At least one of the first side opening 41 and the second side opening 42 can serve as an outlet for excess cooling liquid. As shown in Figure 2, in some embodiments, the lower edge of at least one of the first side opening 41 and the second side opening 42 is lower than the electrode terminals 15 of the cell 12. In this way, when the cooling liquid is injected into the housing 29, the maximum liquid level of the cooling liquid is lower than the electrode terminals 15 of the cell 12, thus avoiding contact between the cooling liquid and the electrode terminals 15.

[0028] Please refer to Figure 3. Figure 3 is a plan view of the battery pack 21 shown in Figure 2, where the first cell series connection element 30 has been removed. Please also refer to Figures 2 and 3. In the direction D in which the cells 12 are arranged, the positive terminals 13 of cells 12 located in the same row are aligned with each other, and the negative terminals 14 of cells 12 located in the same row are aligned with each other. That is, identical electrodes of cells 12 in the same row are located on the same side. As described above, the first cell series connection element 30 shown in Figure 2 is connected to the positive terminal 13 of one cell 12 and the negative terminal 14 of another cell 12. Therefore, each first cell series connection element 30 extends inclined in the direction D in which the cells 12 are arranged, and first cell series connection elements 30 located in the same row are inclined in the same direction. With the above arrangement, the first cell series connection elements 30 can be installed automatically, and the installation of the first cell series connection elements 30 can be completed more quickly, improving production efficiency. For example, a robotic arm can be used to place the first cell series connection element 30 into the cell 12. The positive terminal 13 and negative terminal 14 of the cell 12 have the alignment characteristic described above, and the orientation of the first cell series connection elements 30 located in the same row is the same. The robotic arm does not need to rotate to change direction and can continuously place the first cell series connection elements 30 in the same row. The arrangement of the cell 12 shown in Figure 3 can reduce errors that may occur in conventional battery packs because the cell electrodes need to be arranged alternately during manufacturing, thereby improving production efficiency.

[0029] Please refer to Figure 4. Figure 4 is an enlarged view of the first cell series connection element 30 of the battery pack 21 shown in Figure 2. The multilayer structure 31 of the first cell series connection element 30 includes a plurality of first metal sheets 60 stacked on top of each other, with a gap 35 between any two adjacent first metal sheets 60, the gap 35 which can be used for airflow to pass through. Two fixing members 32 connect the plurality of first metal sheets 60 by fixing and clamping both ends of the first metal sheets 60. In some embodiments, the fixing members 32 are sheet metal members folded in half.

[0030] As shown in Figure 4, each first metal sheet 60 has an intermediate segment 65 located between two fixing members 32. The intermediate segments 65 of any two adjacent first metal sheets 60 are separated from each other to form a gap 35. The fixing members 32 have an opening 33, which is, for example, a round hole. The opening 33 facilitates welding or screwing the fixing member 32 to the corresponding electrode terminal 15.

[0031] Please refer to Figure 5. Figure 5 is a side view of the first cell series connection element 30 shown in Figure 4. In some embodiments, the fixing member 32 includes a second metal sheet, which is bent to form a recess 34, the end of the first metal sheet 60 is inserted into the recess 34, and the first metal sheet 60 and the fixing member 32 are fixed by ultrasonic welding. In some embodiments, the thickness of the second metal sheet is greater than the thickness of each first metal sheet 60. In some embodiments, the hardness of the material of the second metal sheet is greater than the hardness of the material of each first metal sheet 60. In some embodiments, the first metal sheet 60 and the second metal sheet include copper alloys of different hardnesses.

[0032] As shown in Figure 5, each first metal sheet 60 further includes a first planar segment 61 and a second planar segment 62. The first planar segment 61 and the second planar segment 62 are separated from each other, and an intermediate segment 65 is located between the first planar segment 61 and the second planar segment 62 and has a different height from the first planar segment 61 and the second planar segment 62. Two fixing members 32 clamp the first planar segment 61 and the second planar segment 62 of the first metal sheet 60, respectively. One end of a plurality of first metal sheets 60 is superimposed on the first planar segment 61 and then housed in a recess 34 of the fixing member 32, and the other end of a plurality of first metal sheets 60 is superimposed on the second planar segment 62 and then housed in a recess 34 of the other fixing member 32. The intermediate segment 65 is substantially parallel to the first planar segment 61 and the second planar segment 62.

[0033] As shown in Figure 5, each first metal sheet 60 further includes a first bevel segment 63 and a second bevel segment 64. The first bevel segment 63 is connected between the first planar segment 61 and the intermediate segment 65, and the second bevel segment 64 is connected between the second planar segment 62 and the intermediate segment 65. Multiple first metal sheets 60 are folded one by one at the first bevel segment 63 such that any two adjacent first metal sheets 60 form a gap 35 in the intermediate segment 65. Similarly, multiple first metal sheets 60 are folded one by one at the second bevel segment 64 such that any two adjacent first metal sheets 60 form a gap 35 in the intermediate segment 65.

[0034] In some embodiments, the manufacturing method for the first cell series connection element 30 includes: bending two bevels in a plurality of planar metal sheets to form a plurality of first metal sheets 60; overlapping the plurality of first metal sheets 60 and using two fixing members 32 to sandwich the first planar segments 61 and second planar segments 62 at both ends of the first metal sheets 60; and performing ultrasonic welding on the two fixing members 32 and the first planar segments 61 and second planar segments 62 at both ends of the first metal sheets 60. After welding, the first cell series connection element 30 and each of the first metal sheets 60 do not come into contact with each other at the intermediate segments 65, forming a gap 35.

[0035] Please refer to Figure 6. Figure 6 is an enlarged view of a part of the first cell series connection element 30 and cell 12 of the battery pack 21 shown in Figure 2. In some embodiments, the middle segment 65 of the lowest (i.e., closest to cell 12) first metal sheet 60 is higher than the electrode terminals 15 of cell 12 and the top surface 17 of cell 12, forming an air passage 19 between the lowest first metal sheet 60 and the top surface 17 of cell 12, which helps in heat dissipation of cell 12.

[0036] Please refer to Figure 7. Figure 7 is a perspective view of a first cell series connection element 30A according to another embodiment of the present disclosure. The first cell series connection element 30A of this embodiment includes a plurality of first metal sheets 70, the difference between the first metal sheet 70 and the aforementioned first metal sheet 60 is that at least one of the plurality of first metal sheets 70 includes at least one bent portion 77, the bent portion 77 being able to provide support to the first metal sheet 70. In some embodiments, the first metal sheet 70 includes adjacent metal sheets M1, M2. The intermediate segment 75 of metal sheet M1 includes a planar region 76, and the intermediate segment 75 of metal sheet M2 includes a bent portion 77, the bent portion 77 rising toward metal sheet M1 and in contact with the planar region 76 of metal sheet M1. In some embodiments, metal sheet M1 is located below metal sheet M2, and the bent portion 77 of metal sheet M2 rises downward and in contact with metal sheet M1. In some embodiments, the bottommost first metal sheet 70 does not include the folded portion 77.

[0037] Please refer to Figure 8. Figure 8 is a perspective view of a first cell series connection element 30B according to another embodiment of the present disclosure. The first cell series connection element 30B of this embodiment includes a plurality of first metal sheets 80, the difference between the first metal sheet 80 and the aforementioned first metal sheet 60 being that at least one of the plurality of first metal sheets 80 includes at least one folding edge 87, the folding edge 87 being able to provide support to the first metal sheet 80. In some embodiments, the first metal sheet 80 includes adjacent metal sheets M1, M2. An intermediate segment 85 of metal sheet M2 has a notch 86 and a folding edge 87 extending from the edge of the notch 86, the folding edge 87 being bent toward metal sheet M1 and in contact with the intermediate segment 85 of metal sheet M1. In some embodiments, metal sheet M1 is located below metal sheet M2, and the folding edge 87 of metal sheet M2 is bent downward and in contact with metal sheet M1. In some embodiments, the bottommost first metal sheet 80 does not include a folding edge 87.

[0038] Please refer to Figure 9. Figure 9 is a schematic side view of a first cell series connection element 30C according to another embodiment of the present disclosure. The first cell series connection element 30C of this embodiment includes a plurality of first metal sheets 90, the difference between the first metal sheet 90 and the aforementioned first metal sheet 60 is that at least two of the plurality of first metal sheets 90 are of different lengths, and when the ends of the first metal sheets 90 of different lengths are aligned, the middle segment 65 of the longer first metal sheet 90 warps, forming a gap 35 between the two first metal sheets 90. In some embodiments, the first metal sheet 90 includes adjacent metal sheets M1, M2, where metal sheet M1 is located below metal sheet M2. The ends of metal sheet M1 and metal sheet M2 are superimposed (for example, the first planar segment 61 of metal sheet M1 and the first planar segment 61 of metal sheet M2 are superimposed, and the second planar segment 62 of metal sheet M1 and the second planar segment 62 of metal sheet M2 are superimposed), and the length of metal sheet M1 is less than the length of metal sheet M2.

[0039] As shown in Figure 9, in some embodiments, the outer edges of the first planar segments 61 of the metal sheets M1 and M2 may be aligned with each other, and the outer edges of the second planar segments 62 of the metal sheets M1 and M2 may also be aligned with each other. The first bevel segments 63 of the metal sheets M1 and M2 may be separated from each other or in contact with each other, as shown in the figure, and similarly, the second bevel segments 64 of the metal sheets M1 and M2 may be separated from each other or in contact with each other, as shown in the figure. In some embodiments, the lengths of all the first metal sheets 90 of the first cell series connection element 30C are different.

[0040] As described above, this disclosure provides a cell series connection element for connecting multiple cells in a battery pack in series, the cell series connection element comprising a multilayer structure, the multilayer structure comprising multiple stacked metal sheets with a gap between any two adjacent metal sheets. The installation of the multilayer structure can prevent overheating of the cell series connection element itself, and the cell series connection element can also be used as a heat sink coupled to the cells of the cell series connection element to help cool down the heated cells.

[0041] Although the embodiments described above are provided, they are not intended to limit the disclosure, and any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the disclosure. Therefore, the scope of protection of the disclosure should be based on the claims appended below. [Explanation of Symbols]

[0042] 12: Cell 13: Positive terminal 14: Negative terminal 15: Electrode terminal 17:Top surface 19: Airflow channel 20: Energy storage cabinet 21: Battery Pack 22: Bracket 23: Layer Assembly 26: Connection device 28: Cooling device 29: Housing 30, 30A, 30B, 30C: First cell series connection elements 31:Multilayer structure 32: Fixing member 33:Aperture 34: Recess 35: Gap 40: Second cell series connection element 41: First side opening 42: Second side opening 60, 70, 80, 90: First metal sheet 61: First Planar Segment 62: Second Planar Segment 63: First slope segment 64: Second slope segment 65, 75, 85: Intermediate segment 76: Planar area 77: Folding part 86: Notch 87: Folded edge D: Direction M1, M2: Metal sheet

Claims

1. A series-connected cell element, A multilayer structure comprising a plurality of first metal sheets stacked on top of each other, with a gap between any two adjacent first metal sheets, Two fixing members are provided to fix and clamp both ends of the aforementioned multilayer structure and to electrically connect each to the electrode terminals of the cell, Includes, A cell series connection element wherein the plurality of first metal sheets include adjacent third and fourth metal sheets, the third metal sheet includes an intermediate segment, and the fourth metal sheet has a notch and a folded edge extending from the edge of the notch, the folded edge being bent toward the third metal sheet and in contact with the intermediate segment of the third metal sheet.

2. The cell series connection element according to claim 1, wherein the two fixing members include a second metal sheet, the second metal sheet is bent to form a recess, and the ends of the plurality of first metal sheets are inserted into the recess.

3. The cell series connection element according to claim 2, wherein the thickness of the second metal sheet is greater than the thickness of each of the plurality of first metal sheets.

4. The cell series connection element according to claim 2, wherein the hardness of the material of the second metal sheet is greater than the hardness of the material of each of the plurality of first metal sheets.

5. Each of the plurality of first metal sheets includes a first planar segment, a second planar segment, and the intermediate segment, wherein the first planar segment and the second planar segment are separated from each other, the intermediate segment is located between the first planar segment and the second planar segment and has a different height from the first planar segment and the second planar segment, and the two fixing members sandwich the first planar segment and the second planar segment, respectively, the cell series connection element according to claim 1.

6. The cell series connection element according to claim 5, wherein each of the plurality of first metal sheets further includes a first bevel segment and a second bevel segment, the first bevel segment being connected between the first planar segment and the intermediate segment, the second bevel segment being connected between the second planar segment and the intermediate segment, and the plurality of first metal sheets are bent one by one in the first bevel segment and the second bevel segment such that the intermediate segments of any two adjacent first metal sheets form the gap.

7. The cell series connection element according to claim 1, wherein the third metal sheet includes a planar region, and the fourth metal sheet includes a bent portion, the bent portion protruding toward the third metal sheet and in contact with the planar region of the third metal sheet.

8. The cell series connection element according to claim 1, wherein the third metal sheet is located below the fourth metal sheet, the ends of the third metal sheet and the ends of the fourth metal sheet overlap, and the length of the third metal sheet is less than the length of the fourth metal sheet.

9. It is a battery pack, Housing and A plurality of cells, provided within the housing and each including a positive terminal and a negative terminal, arranged in at least one row along one direction, wherein the positive terminals of cells located in the same row are aligned with each other in that direction, and the negative terminals of cells located in the same row are aligned with each other. Each includes a multilayer structure and two fixing members, the multilayer structure includes a plurality of first metal sheets stacked on top of each other, with a gap between any two adjacent first metal sheets, the two fixing members fix and clamp both ends of the multilayer structure, and each includes a plurality of cell series connection elements electrically connected to the positive and negative terminals of two adjacent cells, Includes, A battery pack in which the plurality of first metal sheets include adjacent third and fourth metal sheets, the third metal sheet includes an intermediate segment, the fourth metal sheet has a notch and a folded edge extending from the edge of the notch, the folded edge being bent toward the third metal sheet and in contact with the intermediate segment of the third metal sheet.

10. The battery pack according to claim 9, wherein the housing has a first side opening and a second side opening, the first side opening and the second side opening being provided on opposing sides of the housing and facing the plurality of cell series connection elements.

11. The battery pack according to claim 9, wherein the two fixing members include a second metal sheet, the second metal sheet is folded in half to form a recess, the ends of the plurality of first metal sheets are inserted into the recess, the thickness of the second metal sheet is greater than the thickness of each of the plurality of first metal sheets, or the hardness of the second metal sheet is greater than the hardness of each of the plurality of first metal sheets.

12. The battery pack according to claim 9, wherein the third metal sheet includes a planar region, and the fourth metal sheet includes a bent portion, the bent portion protruding toward the third metal sheet and in contact with the planar region of the third metal sheet.

13. The battery pack according to claim 9, wherein the third metal sheet is located below the fourth metal sheet, the end of the third metal sheet and the end of the fourth metal sheet overlap, and the length of the third metal sheet is less than the length of the fourth metal sheet.

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