Electrochemical device, method for manufacturing electrochemical device, and power consumption device

Abstract

The present invention relates to an electrochemical device (100), a method for manufacturing the electrochemical device (100), and an electric power consuming device (200). In the electrochemical device (100), N cells are divided into M cell groups (10), and cells (1) in the cell groups (10) are arranged along a first direction, and the M cell groups (10) are arranged along the first direction. Each cell (1) includes a cell case (11) and two electrode terminals (12). Along the first direction, the electrode terminals (12) of two adjacent cell groups (10) are connected by a conductive member (24), and a connection region (25) is formed on the conductive member (24). Along the second direction, the cell group (10) includes a first side and a second side arranged opposite each other, and a first fixing member (21) is adhered to at least a portion of the electrode terminal (12) on the first side of the cell group (10), and at least one first fixing member (21) is adhered to at least a portion of the connection area (25), and / or a second fixing member (22) is adhered to at least a portion of the electrode terminal (12) on the second side of the cell group (10), and at least one second fixing member (22) is adhered to at least a portion of the connection area (25).

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present application relate to the field of electrochemical technology, and more particularly to electrochemical devices, methods for manufacturing electrochemical devices, and power consuming devices. [Background technology]

[0002] Currently, electrochemical devices typically have multiple cells connected by electrode terminals, and during use and transportation of the electrochemical device, the connection points of the electrode terminals are subjected to force and deform, which may affect the use of the electrochemical device. Summary of the Invention

[0003] To solve the above problems, embodiments of the present application provide an electrochemical device, a method for manufacturing an electrochemical device, and a power consuming device, thereby improving the above problems.

[0004] According to a first aspect of the present application, there is provided an electrochemical device comprising: N cells, M first fixing members, M second fixing members, and M-1 conductive members, where N and M are both positive integers and 2≦M≦N, the N cells are divided into M cell groups, each cell group including at least one cell, the cells in the cell groups are arranged along a first direction, the M cell groups are arranged along the first direction, each cell includes a cell casing and two electrode terminals, the two electrode terminals are arranged opposite to each other on both sides of the cell casing along a second direction, the second direction is a direction in which the first fixing members and the second fixing members are arranged opposite to each other, and the second direction is a direction in which the first fixing members and the second fixing members are arranged opposite to each other, and the M cell groups are arranged along the first direction, each cell includes a cell casing and two electrode terminals, the two electrode terminals are arranged opposite to each other on both sides of the cell casing along a second direction, and the second direction is a direction in which the first fixing members and the second fixing members are arranged opposite to each other, and the M cell groups are arranged along the first direction, The direction is perpendicular to the first direction, and along the first direction, electrode terminals in two adjacent cell groups are connected by a conductive member, and a connection area is formed on the conductive member. Along the second direction, the cell groups include a first side and a second side that are arranged opposite each other, and the first fixing member is adhered to at least a portion of the electrode terminals on the first side of the cell group, and at least one first fixing member is adhered to at least a portion of the connection area, and / or the second fixing member is adhered to at least a portion of the electrode terminals on the second side of the cell group, and at least one second fixing member is adhered to at least a portion of the connection area.

[0005] In the electrochemical device, the first fixing member is bonded to at least a portion of the electrode terminal on the first side of the cell group, and at least one first fixing member is bonded to at least a portion of the connection area, which is advantageous for protecting the electrode terminal and the conductive member, and can also protect the connection area, thereby improving the stability of the electrochemical device. The second fixing member is bonded to at least a portion of the electrode terminal on the second side of the cell group, and at least one second fixing member is bonded to at least a portion of the connection area, which is advantageous for protecting the electrode terminal and the conductive member and improving the protection of the connection area formed on the electrode terminal and the conductive member, thereby improving the stability of the electrochemical device.

[0006] In some embodiments of the present application, at least one cell group includes a plurality of cells, and electrode terminals of the plurality of cells are connected to each other on a first side of the cell group, and / or at least one cell group includes a plurality of cells, and electrode terminals of the plurality of cells are connected to each other on a second side of the cell group. When a cell group includes a plurality of cells, it is advantageous to connect the cells in series or parallel between adjacent cell groups.

[0007] In some embodiments of the present application, at least one cell group includes a plurality of cells, and at least one electrode terminal of each of the plurality of cells is connected to each other by welding on a first side of the cell group, and / or at least one cell group includes a plurality of cells, and at least one electrode terminal of each of the plurality of cells is connected to each other by welding on a second side of the cell group, which is advantageous in improving the stability of the connections between the plurality of cells.

[0008] In some embodiments of the present application, at least one cell group includes a plurality of cells, and at least one electrode terminal of at least one cell among the plurality of cells has a bent shape on a first side of the cell group, and / or at least one cell group includes a plurality of cells, and at least one electrode terminal of at least one cell among the plurality of cells has a bent shape on a second side of the cell group, which is advantageous for improving space utilization when the plurality of cells are connected to each other.

[0009] In some embodiments of the present application, the electrochemical device further includes an elastic member disposed between two adjacent cell groups and in contact with at least one of the two cell groups, and the elastic member is advantageous in providing a deformation space for the expanded cells.

[0010] In some embodiments of the present application, T1 is the thickness of the elastic member when not compressed by the cells, T2 is the distance in the first direction between two adjacent cell groups, T3 is the thickness when no charge / discharge cycles are performed, and X is half the total number of cells in the two adjacent cell groups in the first direction, where T1, T2, T3, and X satisfy the relationship T2-X*T3*20%≦T1≦T2. The elastic member is advantageous for providing deformation space and support when the cells expand, reducing the risk of cell damage and improving the service life of the electrochemical device.

[0011] In some embodiments of the present application, the first fixing member includes a first sleeve, and the thickness of the first sleeve along the first direction is 1 mm or more and 5 mm or less, and / or the second fixing member includes a second sleeve, and the thickness of the second sleeve along the first direction is 1 mm or more and 5 mm or less, which is advantageous in improving the protection effect for the electrode terminals.

[0012] In some embodiments of the present application, of two adjacent cell groups, a first fixing member in one cell group is connected to a second fixing member in the other cell group, and a gap is formed between the first fixing member and the second fixing member in the first direction. Forming a gap between the two adjacent cell groups also improves heat dissipation of the cell groups, which is advantageous for further improving heat dissipation of the electrochemical device.

[0013] In some embodiments of the present application, a convex portion is provided on one of the first fixing member and the second fixing member along the first direction, and a gap is formed between the first fixing member and the second fixing member by the convex portion.

[0014] In some embodiments of the present application, a recess is provided in the other of the first fixing member and the second fixing member along the first direction, the length of the convex portion along the first direction is longer than the length of the concave portion along the first direction, and a gap is formed between the first fixing member and the second fixing member by engagement between the convex portion and the concave portion.

[0015] In the electrochemical device, the length of the convex portion is longer than the length of the concave portion along the first direction, and engagement between the convex portion and the concave portion forms a gap between the first fixing member and the second fixing member, and also forms a gap between adjacent cell groups, which is advantageous for improving heat dissipation of the cell groups and further improving heat dissipation of the electrochemical device.

[0016] In some embodiments of the present application, the cell further includes an electrode assembly, the electrode assembly is installed in the cell case, two electrode terminals are connected to the electrode assembly and extend from the cell case, and in the same group of cells, the projection of the first fixing member is spaced apart from the projection of the electrode assembly of a cell in the group of cells along the first direction, and / or in the same group of cells, the projection of the second fixing member is spaced apart from the projection of the electrode assembly of a cell in the group of cells along the first direction.

[0017] In the above electrochemical device, in the same cell group, the projections of the first fixing member and the second fixing member are both spaced apart from the projection of the electrode assembly along the first direction, which is advantageous in reducing the impact on the expansion of the electrode assembly and improving the service life of the electrochemical device.

[0018] In some embodiments of the present application, at least one first fixing member is molded onto at least a portion of the first side and connection area of ​​the cell group by an injection molding process, and / or at least one second fixing member is molded onto at least a portion of the second side and connection area of ​​the cell group by an injection molding process, which is advantageous for improving protection of the connection area formed on the electrode terminal and the conductive member.

[0019] In some embodiments of the present application, the first fixing member covers the portion of the electrode terminal located outside the cell case and at least a part of the cell case, and / or the second fixing member covers the portion of the electrode terminal located outside the cell case and at least a part of the cell case, which is advantageous for improving protection of the electrode terminal and the cell.

[0020] In some embodiments of the present application, at least one first through hole is provided in the first fixing member, and the first through hole penetrates the first fixing member along a third direction, and / or at least one first through hole is provided in the second fixing member, and the first through hole penetrates the second fixing member along a third direction, and the third direction is perpendicular to the first direction and the second direction. This is advantageous for heat dissipation in the electrode terminal to which the first fixing member and / or the second fixing member is adhered, and improves heat dissipation of the electrochemical device.

[0021] In some embodiments of the present application, the electrochemical device further includes a housing, the housing including a third wall and a fourth wall disposed opposite each other along the third direction, and a second through-hole is provided in the third wall and / or the fourth wall, the second through-hole communicating with the first through-hole. This arrangement is advantageous for further enhancing the heat dissipation effect of the electrochemical device.

[0022] According to a second aspect of the present application, there is provided an electrochemical device comprising: N cells, A first fixing members, A second fixing members, and (L-1)*A third fixing members, where N, M, and L are all positive integers, and 2≦M≦N, L≧2; the N cells are divided into M cell groups, and the M cell groups are divided into A rows and L columns, and along a second direction, the cell groups include first and second sides arranged opposite to each other, each cell group includes at least one cell, the cells in the cell groups are arranged along the first direction, and the second direction is perpendicular to the first direction; each cell includes a cell casing and two electrode terminals, and the two electrode terminals are arranged opposite to each other on both sides of the cell casing along the second direction; and in one row of the cell groups, the first fixing members is located on a first side of a first cell group among the cell groups in the row and is adhered to at least a part of the electrode terminals on the first side of the first cell group, the second fixing member is located on a second side of the last cell group among the cell groups in the row and is adhered to at least a part of the electrode terminals on the second side of the last cell group, in one row of cell groups, the electrode terminals of two adjacent cell groups are connected, the third fixing member is connected to each of the two adjacent cell groups, the third fixing member is adhered to at least a part of the electrode terminals on the second side of one cell group of the two adjacent cell groups, and the third fixing member is adhered to at least a part of the electrode terminals on the first side of the other cell group of the two adjacent cell groups.

[0023] In the electrochemical device, the first fixing member, the second fixing member and the third fixing member are advantageous in strengthening protection for each electrode terminal in the cell group, and improve the stability and service life of the electrochemical device.

[0024] In some embodiments of the present application, the cell groups in row A are stacked and installed along a first direction, and the electrochemical device further includes A-1 conductive members, wherein a first-side electrode terminal of a first cell group in one of two adjacent cell groups is connected to a second-side electrode terminal of a first cell group in the other of the adjacent cell groups, and a connection area is formed on the conductive member, and at least one of the first fixing members is adhered to at least a portion of the connection area, and / or at least one of the second fixing members is adhered to at least a portion of the connection area, which is advantageous for improving protection of the electrode terminals and the connection area formed on the conductive members, and improving the stability of the electrochemical device.

[0025] In some embodiments of the present application, in two adjacent cell groups in the same row, the electrode terminals on the second side of one cell group are connected to the electrode terminals on the first side of the other cell group by welding, which is advantageous in improving the stability of the connection between the adjacent cell groups.

[0026] In some embodiments of the present application, at least one cell group includes a plurality of cells, and at least one of the plurality of cells has an electrode terminal in a bent shape on a first side of the cell group, and / or at least one cell group includes a plurality of cells, and at least one of the plurality of cells has an electrode terminal in a bent shape on a second side of the cell group, which is advantageous for improving space utilization when the plurality of cells are connected to each other.

[0027] In some embodiments of the present application, the electrochemical device further includes an elastic member disposed between two adjacent cell groups in the same row, the elastic member contacting at least one of the two cell groups, and the elastic member is advantageous in providing a deformation space for the expanded cells.

[0028] In some embodiments of the present application, T1 is the thickness of the elastic member when not compressed by the cells, T2 is the distance in the first direction between two adjacent cell groups in the same column, T3 is the thickness when no charge / discharge cycles are performed, and X is half the total number of cells in the two adjacent cell groups in the same column, where T1, T2, T3, and X satisfy the relationship T2-X*T3*20%≦T1≦T2. The elastic member is advantageous in providing deformation space and support for the expanded cells, reducing the risk of cell damage and improving the service life of the electrochemical device.

[0029] In some embodiments of the present application, the first fixing member includes a first sleeve, and the thickness of the first sleeve along the first direction is 1 mm or more and 5 mm or less, and / or the second fixing member includes a second sleeve, and the thickness of the second sleeve along the first direction is 1 mm or more and 5 mm or less, and / or the third fixing member includes a third sleeve and a fourth sleeve, and the thickness of the third sleeve along the first direction is 1 mm or more and 5 mm or less, and the thickness of the fourth sleeve is 1 mm or more and 5 mm or less, which is advantageous in improving the protection effect for the electrode terminals.

[0030] In some embodiments of the present application, at least one first fixing member is molded by an injection molding process on at least a portion of the first side and connection region of a first cell group of the cells in the row, and / or at least one second fixing member is molded by an injection molding process on at least a portion of the second side and connection region of a last cell group of the cells in the row, and / or in two adjacent cell groups in a row, at least one third fixing member is molded by an injection molding process on the second side of one cell group and the first side of the other cell group. This is advantageous for improving protection for the electrode terminals and the connection regions formed on the conductive members, and for improving protection for the connections between the electrode terminals and the electrode terminals, thereby improving the stability of the electrochemical device.

[0031] In some embodiments of the present application, the first fixing member covers the portion of the electrode terminal located outside the cell case and at least a part of the cell case, and / or the second fixing member covers the portion of the electrode terminal located outside the cell case and at least a part of the cell case, and / or the third fixing member covers the portion of the electrode terminal located outside the cell case and at least a part of the cell case, which is advantageous for improving protection of the electrode terminal and the cell.

[0032] In some embodiments of the present application, at least one first through hole is provided in the first fixing member, and the first through hole penetrates the first fixing member along the third direction, and / or at least one first through hole is provided in the second fixing member, and the first through hole penetrates the second fixing member along the third direction, and / or at least one first through hole is provided in the third fixing member, and the first through hole penetrates the third fixing member along the third direction, the third direction being perpendicular to the first direction and the second direction. This is advantageous for heat dissipation in the electrode terminal to which the first fixing member and / or the second fixing member and / or the third fixing member are bonded, and improves heat dissipation of the electrochemical device.

[0033] In some embodiments of the present application, of two adjacent cell groups, a first fixing member in one cell group is connected to a second fixing member in the other cell group along the first direction, with a gap formed between the first fixing member and the second fixing member in the other cell group, and / or a third fixing member in one cell group is connected to a third fixing member in the other cell group along the first direction, with a gap formed between the two third fixing members in the first direction, which is advantageous for improving heat dissipation of the cell groups and further improving heat dissipation of the electrochemical device.

[0034] In some embodiments of the present application, the cell further includes an electrode assembly, the electrode assembly is installed in the cell case, two electrode terminals are connected to the electrode assembly and extend from the cell case, and in the same group of cells, a projection of the first fixing member is spaced apart from a projection of the electrode assemblies of cells in the group of cells along the first direction, and / or in the same group of cells, a projection of the second fixing member is spaced apart from a projection of the electrode assemblies of cells in the group of cells along the first direction, and / or in the same row of groups of cells, a projection of the third fixing member between two adjacent groups of cells is spaced apart from a projection of the electrode assemblies of cells in the two groups of cells along the first direction, which is advantageous in reducing the influence of the expansion of the electrode assemblies and improving the service life of the electrochemical device.

[0035] In some embodiments of the present application, the electrochemical device further includes a housing, the housing including a third wall and a fourth wall opposite each other along a third direction, the third wall and / or the fourth wall having a second through-hole communicating with the first through-hole, which is advantageous in further enhancing the heat dissipation effect of the electrochemical device.

[0036] According to a third aspect of the present invention, there is provided a power consuming device, the power consuming device including the electrochemical device according to any one of the first and second aspects described above.

[0037] A manufacturing flow chart of a first embodiment of the present invention provides a manufacturing method for an electrochemical device, the manufacturing method including: step S101 of connecting electrode terminals of two adjacent cell groups among M cell groups with a conductive member and forming a connection region on the conductive member; step S102 of applying a flowable insulating material to a first side of the cell group and the conductive member and hardening the insulating material to bond the connection region close to the first side of the cell group, portions of the electrode terminals located outside the cell casings, and at least a portion of the cell casings, thereby forming a first fixing member; and step S103 of applying a flowable insulating material to a second side of the cell group and the conductive member and hardening the insulating material to bond the connection region close to the second side of the cell group, portions of the electrode terminals located outside the cell casings, and at least a portion of the cell casings, thereby forming a second fixing member.

[0038] A manufacturing flow chart of a second embodiment of the present invention provides a manufacturing method for an electrochemical device, the manufacturing method including: step S201: connecting electrode terminals of two adjacent cell groups in the same row, applying a flowable insulating material to first and second sides of the two adjacent cell groups, and curing the insulating material to bond the portions of the electrode terminals outside the cell casings and at least a portion of the cell casings to form a third fixing member; step S202: applying a flowable insulating material to a first side of a first cell group in the row, and curing the insulating material to bond the portions of the electrode terminals outside the cell casings and at least a portion of the cell casings to form a first fixing member; and step S203: applying a flowable insulating material to a second side of a last cell group in the row, and curing the insulating material to bond the portions of the electrode terminals outside the cell casings and at least a portion of the cell casings to form a second fixing member.

[0039] According to the manufacturing flowchart of the second embodiment of the present application, the method further includes step S204 of providing M-1 conductive members, connecting an electrode terminal on a first side of a first cell group in one of the cell groups in two adjacent rows to an electrode terminal on a second side of a first cell group in the other row using the conductive member, and forming a connection area on the conductive member; step S205 of applying a flowable insulating material to the first side of the cell group and the conductive member, and hardening the insulating material to bond the connection area close to the first side of the cell group; and step S206 of applying a flowable insulating material to the second side of the cell group and the conductive member, and hardening the insulating material to bond the connection area close to the second side of the cell group.

[0040] In the electrochemical device of the first embodiment of the present application, a first fixing member is bonded to at least a portion of the electrode terminals on the first side of the cell group, and at least one first fixing member is bonded to at least a portion of the connection area formed on the electrode terminals and the conductive member, and / or a second fixing member is bonded to at least a portion of the electrode terminals on the second side of the cell group, and at least one second fixing member is bonded to at least a portion of the connection area formed on the electrode terminals and the conductive member. Each first fixing member and each second fixing member is advantageous for protecting the electrode terminals of the cells and the connection area formed on the electrode terminals and the conductive member, and further improves the stability and service life of the electrochemical device.

[0041] In an electrochemical device according to a second embodiment of the present invention, in one row of cell groups, the electrode terminals of two adjacent cell groups are connected, and a third fixing member is bonded to at least a portion of the second-side electrode terminal of one of the two adjacent cell groups, and a third fixing member is bonded to at least a portion of the first-side electrode terminal of the other of the two adjacent cell groups. The first fixing member is bonded to at least a portion of the connection area formed on the electrode terminal and the conductive member, and / or the second fixing member is bonded to at least a portion of the connection area formed on the electrode terminal and the conductive member. Each of the first fixing member, each of the second fixing member, and each of the third fixing members is advantageous for protecting the electrode terminals of the cells and the connection area formed on the electrode terminal and the conductive member, and further improves the stability and service life of the electrochemical device. [Brief explanation of the drawings]

[0042] Hereinafter, in order to more clearly explain the technical solutions of the embodiments of the present application and the prior art, drawings necessary for the embodiments or the prior art will be briefly described. However, the drawings described below are only a part of the embodiments of the present application, and it is obvious that a person skilled in the art can derive other drawings based on these drawings.

[0043] [Figure 1] FIG. 1 shows a schematic diagram of one preferred electrochemical device of the present application. [Figure 2] FIG. 2 shows a schematic diagram of the arrangement of cells in one preferred electrochemical device of the present application. [Figure 3] FIG. 3 shows a schematic diagram of the arrangement of cells in another preferred electrochemical device of the present application. [Figure 4] FIG. 4 is a schematic diagram showing a connection method for the electrode terminals of each cell in one cell group of the present invention. [Figure 5] FIG. 5 shows a preferred structural schematic diagram of one cell of the present application. [Figure 6] FIG. 6 shows a preferred structural schematic diagram of one first fixing member of the present invention. [Figure 7] FIG. 7 shows a preferred structural schematic diagram of one second fixing member of the present invention. [Figure 8] FIG. 8 shows an enlarged schematic diagram of Q1 in FIG. [Figure 9] FIG. 9 is a schematic diagram showing a case in which the length of the first recessed portion along the first direction of the present invention is shorter than the length of the second protruding portion along the first direction. [Figure 10] FIG. 10 is a schematic diagram showing a case in which the length of the first recessed portion in the first direction of the present invention is longer than the length of the second protruding portion in the first direction. [Figure 11] FIG. 11 is an enlarged schematic view of a cross section of Q2 in FIG. [Figure 12] FIG. 12 shows a preferred structural schematic diagram of the third wall of the electrochemical device in FIG. [Figure 13] FIG. 13 shows a preferred structural schematic diagram of the electrochemical device in FIG. 1 with the fourth wall removed. [Figure 14] FIG. 14 shows a schematic diagram of a further preferred electrochemical device of the present application. [Figure 15] FIG. 15 shows a schematic diagram of the arrangement of cells in a further preferred electrochemical device of the present application. [Figure 16] FIG. 16 shows a schematic diagram of the arrangement of cells in a further preferred electrochemical device of the present application. [Figure 17] FIG. 17 is a schematic diagram showing how the second electrode terminal and the first electrode terminal of the present invention are connected. [Figure 18] FIG. 18 shows another schematic diagram of the connection between the second electrode terminal and the first electrode terminal of the present invention. [Figure 19] FIG. 19 shows an enlarged schematic diagram of Q4 in FIG. [Figure 20] FIG. 20 is a schematic diagram showing the positions of the third fixing member and the electrode terminals of the present invention. [Figure 21] FIG. 21 shows a preferred structural schematic diagram of one third fixing member of the present application. [Figure 22] FIG. 22 shows an enlarged schematic diagram of Q3 in FIG. [Figure 23] FIG. 23 is an enlarged schematic view of the cross section of Q5 in FIG. [Figure 24]FIG. 24 shows a preferred structural schematic diagram of the third wall of the electrochemical device in FIG. [Figure 25] FIG. 25 shows a preferred structural schematic diagram of the electrochemical device in FIG. 14 with the fourth wall removed. [Figure 26] FIG. 26 shows a structural schematic diagram of a preferred power consuming device of the present application. [Figure 27] FIG. 27 shows a preferred flow chart of a method for manufacturing an electrochemical device provided in the first aspect of the present application. [Figure 28] FIG. 28 shows a preferred flow chart of a method for manufacturing an electrochemical device provided in the second aspect of the present application. [Figure 29] FIG. 29 shows a preferred flow chart of a method for manufacturing an electrochemical device provided in the second aspect of the present application.

[0044] Explanation of symbols 100: electrochemical device, 200: power consuming device, 10: cell group, 101: first side of cell group, 102: second side of cell group, 1: cell, 11: cell casing, 12: electrode terminal, 1201: first region, 1202: second region, 13: electrode assembly, 21: first fixing member, 210: first sleeve, 211: first side of first fixing member, 212: second side of first fixing member, 22: second fixing member, 220: second sleeve, 221: first side of second fixing member, 222: second side of second fixing member, 23: third fixing member, 231: third sleeve, 2311: first side of third sleeve, 2312: second side of third sleeve, 232: fourth sleeve, 2321 : first side of fourth sleeve, 2322: second side of fourth sleeve, 24: conductive member, 25: connection area between electrode terminal and conductive member, 26: gap between first fixing member and second fixing member, 27: positive electrode connection end, 28: negative electrode connection end, 29: gap between adjacent third fixing members, 4: housing, 401: first wall surface, 402: second wall surface, 403: third wall surface, 404: fourth wall surface, 41: first convex portion, 42: first recess, 43: second convex portion, 44: second recess, 45: third convex portion, 46: third recess, 47: fourth convex portion, 48: fourth recess, 5: elastic member, 61: first through hole, 62: second through hole, 71: fifth convex portion, F1: first direction, F2: second direction, F3: third direction. DETAILED DESCRIPTION OF THE INVENTION

[0045] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present application, the technical solutions of the embodiments of the present application will be described below clearly and completely with reference to the drawings of the embodiments of the present application. It is clear that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments of the present application. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present application are all included in the protection scope of the embodiments of the present application.

[0046] Specific embodiments of the electrochemical device and the power consuming device in the examples of the present application will be described below with reference to the drawings. Note that for convenience of illustration, the structures in the drawings are not necessarily drawn to actual scale.

[0047] 1 to 13, according to a first aspect of the present application, there is provided an electrochemical device 100. The electrochemical device 100 includes N cells 1, M first fixing members 21, M second fixing members 22, and M-1 conductive members 24, where N and M are both positive integers and 2≦M≦N, the N cells 1 are divided into M cell groups 10, each cell group 10 includes at least one cell 1, the cells 1 in the cell groups 10 are arranged along a first direction F1, and the M cell groups 10 are arranged along the first direction F1. Each cell 1 includes a cell case 11 and two electrode terminals 12. The two electrode terminals 12 are arranged opposite each other on both sides of the cell case 11 along a second direction F2. The second direction F2 is a direction in which the first fixing member 21 and the second fixing member 22 in one cell group 10 are arranged opposite each other, and the second direction F2 is perpendicular to the first direction F1. Along the first direction F1, the electrode terminals 12 in two adjacent cell groups 10 are connected by a conductive member 24, and a connection area 25 is formed on the conductive member 24. Along the second direction F2, the cell group 10 includes a first side 101 and a second side 102 arranged opposite each other, and the first fixing member 21 is bonded to at least a portion of the electrode terminals 12 on the first side 101 of the cell group, and the first fixing member 21 is bonded to at least a portion of the connection area 25 near the first side 101 of the cell group. The first fixing member 21 is advantageous in protecting the electrode terminals 12 of the cells 1 and is also advantageous in protecting the connection regions 25 formed on the electrode terminals and the conductive member. And / or the second fixing member 22 is adhered to at least a portion of the electrode terminals 12 on the second side 102 of the cell group, and the second fixing member 22 is adhered to at least a portion of the connection regions 25 near the second side 102 of the cell group. The second fixing member 22 is advantageous in protecting the electrode terminals 12 of the cells 1 and is also advantageous in protecting the connection regions 25 formed on the electrode terminals and the conductive member.

[0048] In some embodiments, each of the cells includes an electrode assembly 13, a cell casing 11, and an electrode terminal 12. The electrode assembly 13 is installed in the cell casing 11, and the electrode terminal 12 is connected to the electrode assembly 13 and extends from the cell casing 11. The cell casing 11 includes two electrode terminals 12, one of which is a positive electrode terminal and the other of which is a negative electrode terminal. Preferably, the positive electrode terminal and the negative electrode terminal are provided at the same end of the cell casing 11 along the second direction F2. Preferably, the positive electrode terminal and the negative electrode terminal are provided at opposite ends of the cell casing 11 along the second direction F2. In this specification, the positive electrode terminal and the negative electrode terminal are provided at opposite ends of the cell casing 11 as an example.

[0049] Referring to FIG. 5, the electrode terminal 12 includes a first region 1201 located inside the cell casing 11 and a second region 1202 located outside the cell casing 11, and the first region 1201 is connected to the electrode assembly 13.

[0050] In some embodiments, the electrode assembly 13 may include a positive electrode piece, a negative electrode piece, and a separator positioned between the positive electrode piece and the negative electrode piece. The electrode assembly 13 may be formed by winding the positive electrode piece, the separator, and the negative electrode piece, or by stacking the positive electrode piece, the separator, and the negative electrode piece. Details regarding the positive electrode piece, the separator, and the negative electrode piece may be referenced in the related art, but are not limited to these in the present application. For example, the positive electrode piece may include a positive electrode active material layer and a positive electrode current collector. The positive electrode active material layer may be disposed on the positive electrode current collector, for example, the positive electrode active material layer may be coated on the positive electrode current collector. An uncoated foil area is provided on the edge of the positive electrode current collector, and an electrode terminal 12 is connected to the uncoated foil area. For example, the electrode terminal 12 may be used as a positive electrode terminal or an electrode terminal for sampling. For example, the negative electrode piece may include a negative electrode active material layer and a negative electrode current collector, the negative electrode active material layer is disposed on the negative electrode current collector, for example, the negative electrode active material layer may be coated on the negative electrode current collector, and the edge of the negative electrode current collector has an uncoated foil material area, and an electrode terminal 12 is electrically connected to the uncoated foil material area, for example, the electrode terminal 12 may be used as a negative electrode terminal or an electrode terminal for sampling.

[0051] In some embodiments, in the same cell group 10, the projection of the first fixing member 21 is spaced apart from the projection of the electrode assembly 13 of cell 1 in the cell group 10 along the first direction F1, which is advantageous in reducing the effect of the first fixing member 21 on the expansion of the electrode assembly 13.

[0052] In some embodiments, in the same cell group 10, the projection of the second fixing member 22 is spaced apart from the projection of the electrode assembly 13 of cell 1 in the cell group 10 along the first direction F1, which is advantageous in reducing the effect of the second fixing member 22 on the expansion of the electrode assembly 13.

[0053] The electrochemical device 100 provided in the first embodiment of the present invention will be described in detail below, but it should be understood that the following description does not limit the present invention.

[0054] The electrochemical device 100 provided in the first embodiment of the present application may be a secondary battery, the type of which may be, but is not limited to, a lithium ion battery, a sodium ion battery, a lead acid battery, or the like.

[0055] 1 and 2, which show schematic diagrams of the first direction F1, when the number of cell groups 10 in the electrochemical device 100 is M≧2 and the number of cells 1 in each cell group 10 is greater than 1, the cells 1 in each cell group 10 are stacked in order along the first direction F1, and M cell groups 10 are sequentially arranged along the first direction F1. Other cases are similar, and descriptions thereof will be omitted here. Preferably, the number of conductive members 24 is M−1. For example, in FIG. 2, M=8 and N=16, each cell group 10 includes two cells 1, and the total number of conductive members 24 is seven (i.e., M−1), but this is not limited to this in the present application.

[0056] In some embodiments, in the present application, M first fixing members 21 may be located on the first sides 101 of the M cell groups 10, respectively, and may be bonded to at least a portion of the electrode terminals 12 on the first sides 101 of each of the cell groups 10, with one first fixing member 21 located on the first side 101 of one cell group 10. M second fixing members 22 may be located on the second sides 102 of the M cell groups 10, respectively, and may be bonded to at least a portion of the electrode terminals 12 on the second sides 102 of each of the cell groups 10, with one second fixing member 22 located on the second side 102 of one cell group 10.

[0057] In some embodiments, the first fixing member 21 covers the second region 1202 of each electrode terminal 12 to provide improved protection for the electrode terminals 12 .

[0058] In some embodiments, the second fixing member 22 covers the second region 1202 of each electrode terminal 12 to provide additional protection to the electrode terminals 12 .

[0059] In some embodiments, the first fastening member 21 covers at least a portion of the cell casing, thereby providing improved protection to the cell casing.

[0060] In some embodiments, the second fastening member 22 covers at least a portion of the cell casing, thereby providing improved protection to the cell casing.

[0061] In some embodiments, the electrode terminals 12 in two adjacent cell groups 10 are connected to the conductive member 24 by welding, and a connection area is formed on the conductive member 24, and the welding method is, for example, laser welding or ultrasonic welding, but is not limited thereto.

[0062] In some embodiments, the electrode terminals 12 of two adjacent cell groups 10 are connected together and then connected to the conductive member 24 via another conductive member by welding.

[0063] In some embodiments, the electrode terminals 12 in the two cell groups 10 are connected to the conductive member 24 with a conductive adhesive, i.e., at least one electrode terminal 12 in each of the two cell groups 10 is respectively adhered to the conductive member 24 with a conductive adhesive, thereby connecting the electrode terminals 12 with the conductive member 24 and forming a connection region 25 on the conductive member 24.

[0064] In some embodiments, the electrode terminals 12 in the two cell groups 10 are connected to the conductive member 24 by a mechanical structure, a recess is provided on one of the electrode terminals 12 and the conductive member 24, and a protrusion is provided on the other, and the recess and the protrusion are connected to form a connection region 25 on the conductive member 24.

[0065] In some embodiments, one of the two electrode terminals 12 in the cell 1 is a positive electrode terminal and the other is a negative electrode terminal, and in the electrochemical device 100 of the present application, N cells 1 are connected to each other in series or parallel, so that ultimately the positive electrode terminal of at least one cell 1 forms the positive electrode of the electrochemical device 100, and the negative electrode terminal of at least one cell 1 forms the negative electrode of the electrochemical device 100.

[0066] In some embodiments, the number of electrode terminals 12 in cell 1 is greater than two, and at least one electrode terminal 12 is used to sample physical parameters of the cell (voltage, current, etc.) and may be electrically connected to, for example, a battery management system.

[0067] In some embodiments, the first fixing member 21 is provided on the first side 101 of the cell group 10 and the conductive member 24 by an injection molding process or a casting process, and is bonded to the connection region 25 near the first side 101 of the cell group 10, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11, thereby providing improved protection for the connection region 25 formed on the electrode terminal 12 and the conductive member 24. In some embodiments, the second fixing member 22 is provided on the second side 102 of the cell group 10 and the conductive member 24 by an injection molding process or a casting process, and is bonded to the connection region 25 near the second side 102 of the cell group 10, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11, thereby providing improved protection for the connection region 25 formed on the electrode terminal 12 and the conductive member 24.

[0068] In some embodiments, injection molding can form a bond by melting an insulating material in an injection molding device, coating the cell group 10 and conductive member 24 with the molten insulating material, and hardening the insulating material to form the first fixing member 21 or the second fixing member 22.

[0069] In some embodiments, the injection molding process for the first fixing member 21 includes the following steps: first, connect at least one electrode terminal 12 of each of two adjacent cell groups 10 in the first direction F1 with a conductive member 24, for example, by welding the electrode terminals 12 of the two cell groups 10 to the conductive member 24 to form a connection; then, injection molding is performed on the first side 101 of the cell group 10 and the conductive member 24; and then coating the connection region 25 formed on the electrode terminal 12 and the conductive member 24, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11 with an insulating material; and then curing the insulating material to form the first fixing member 21. This makes the structure of the injection-molded first fixing member 21 more stable and is advantageous in improving the protective effect.

[0070] In some embodiments, the injection molding process for the second fixing member 22 includes the following steps: first, connect at least one electrode terminal 12 of each of two adjacent cell groups 10 in the first direction F1 with a conductive member 24, for example, by welding the electrode terminals 12 of the two cell groups 10 to the conductive member 24 to form a connection; then, injection molding is performed on the second side 102 of the cell group 10 and the conductive member 24; an insulating material is applied to the connection region 25 formed on the electrode terminal 12 and the conductive member 24, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11; and the insulating material is cured to form the second fixing member 22. This makes the structure of the second fixing member 22 formed by injection molding more stable and is advantageous in terms of improving the protective effect.

[0071] In some embodiments, the bond can be formed by coating the cells 10 and the conductive member 24 with an insulating material (e.g., a flowable insulating material) through an injection process, and then curing the insulating material to form the first fixing member 21 or the second fixing member 22. Preferably, the insulating material includes a sealant.

[0072] In some embodiments, the shapes and structures of the first fixing members 21 may be the same or different, but this is not a limitation here. The shapes and structures of the second fixing members 22 may be the same or different, but this is not a limitation here. In some embodiments, each cell group 10 may include only one cell 1. In some embodiments, each cell group 10 may include at least one cell 1, but the specific number of cells 1 in each cell group 10 is not a limitation here. For example, the number of cells 1 in each cell group 10 may be the same, or the number of cells 1 in each cell group 10 may be different, or the number of cells 1 in some of the cell groups 10 may be the same.

[0073] In the present application, when a cell group 10 includes multiple cells 1, the electrode terminals 12 of each cell 1 in the cell group 10 are connected (for example, by welding), and the connected electrode terminals 12 in each cell group 10 are then connected in sequence (for example, by welding), thereby facilitating the connection in series or parallel between adjacent cell groups 10.

[0074] Hereinafter, several examples will be given to facilitate understanding of the N cells 1, M cell groups 10, M first fixing members 21, M second fixing members 22, and M-1 conductive members 24 of the electrochemical device 100 in the present application. It is understood that the following Examples 1.1 to 1.3 are not intended to limit the present application.

[0075] Example 1.1: In the present application, 2≦M≦N. When 2=M=N, in this Example 1.1, an electrochemical device 100 includes two cells 1, two first fixing members 21, two second fixing members 22, and one conductive member 24. The two cells 1 are divided into two cell groups 10, and each cell group 10 includes one cell 1. The first fixing member 21 is disposed on a first side 101 of the cell group 10 and is bonded to at least a portion of the electrode terminal 12 on the first side 101 of the cell group 10, and a different first fixing member 21 is disposed on the first side 101 of a different cell group 10. The second fixing member 22 is disposed on a second side 102 of the cell group 10 and is bonded to at least a portion of the electrode terminal 12 on the second side 102 of the cell group 10, and a different second fixing member 22 is disposed on the second side 102 of the different cell group 10. The one conductive member 24 connects the electrode terminal 12 on the first side 101 of one cell group 10 to the electrode terminal 12 on the second side 102 of the other cell group 10, a connection area 25 is formed on the conductive member 24, one first fixing member 21 is adhered to at least a portion of the connection area 25, and one second fixing member 22 is adhered to at least a portion of the connection area 25.

[0076] Example 1.2: In the present application, 2≦M≦N. For example, in this Example 1.2, the electrochemical device 100 includes four cells 1, two first fixing members 21, two second fixing members 22, and one conductive member 24. The four cells 1 are divided into two cell groups (i.e., N=4, M=2), and the number of cells 1 in each of the two cell groups is 2 and 2, respectively. The cells 1 in each cell group 10 are stacked in order along the first direction F1, and the two cell groups 10 are arranged in order along the first direction F1. Each first fixing member 21 is arranged on the first side 101 of one cell group 10 and is bonded to at least a portion of at least one electrode terminal 12 on the first side 101 of the cell group 10, and different first fixing members 21 are arranged on the first sides 101 of different cell groups 10. The second fixing member 22 is installed on the second side 102 of the cell group 10 and is adhered to at least a portion of at least one electrode terminal 12 on the second side 102 of the cell group 10, and a different second fixing member 22 is installed on the second side 102 of a different cell group 10. The one conductive member 24 connects the electrode terminal 12 on the first side 101 of one cell group 10 to the electrode terminal 12 on the second side 102 of the other cell group 10, a connection region 25 is formed on the conductive member 24, one first fixing member 21 is adhered to at least a portion of the connection region 25, and one second fixing member 22 is adhered to at least a portion of the connection region 25.

[0077] Example 1.3: In the present application, 2≦M≦N. For example, in this Example 1.3, the electrochemical device 100 includes four cells 1, three first fixing members 21, three second fixing members 22, and two conductive members 24. The four cells 1 are divided into three cell groups (i.e., N=4, M=3), and the number of cells 1 in the three cell groups is 2, 1, and 1, respectively. The cells 1 in each cell group 10 are arranged along a first direction F1, and the three cell groups 10 are arranged sequentially along the first direction F1. Each first fixing member 21 is arranged on the first side 101 of one cell group 10 and is bonded to at least a portion of the electrode terminal 12 on the first side 101 of the cell group 10, and different first fixing members 21 are arranged on the first sides 101 of different cell groups 10. Each second fixing member 22 is installed on the second side 102 of one cell group 10 and is bonded to at least a portion of the electrode terminals 12 on the second side 102 of that cell group 10, and a different second fixing member 22 is installed on the second side 102 of a different cell group 10. One conductive member 24 connects the electrode terminals 12 on the first side 101 of the first cell group 10 to the electrode terminals 12 on the second side 102 of the second cell group 10, and a connection region 25 is formed on that conductive member 24, and the first fixing member 21 of the first cell group 10 and the second fixing member 22 of the second cell group 10 are bonded to at least a portion of the connection region 25. The other conductive member 24 connects the electrode terminal 12 on the first side 101 of the second cell group 10 to the electrode terminal 12 on the second side of the third cell group 10, forming a connection area 25 on the conductive member 24, and the first fixing member 21 of the second cell group 10 and the second fixing member 22 of the third cell group 10 are adhered to at least a portion of the connection area 25.

[0078] It is clear that a person skilled in the art can infer other configurations of the electrochemical device 100 of the present application based on the above Examples 1.1 to 1.3, and therefore the description thereof will be omitted here.

[0079] In some embodiments, at least one cell group 10 includes a plurality of cells 1, and on a first side 101 of the cell group 10, at least one electrode terminal 12 of at least one cell 1 of the plurality of cells 1 has a bent shape.

[0080] In some embodiments, at least one cell group 10 includes a plurality of cells 1, and on the second side 102 of the cell group 10, at least one electrode terminal 12 of at least one cell 1 of the plurality of cells 1 has a bent shape.

[0081] 4, one cell group 10 includes two cells 1, and on a first side 101 of the cell group 10, at least one electrode terminal 12 of each of the two cells 1 has a bent shape, and the bent electrode terminal 12 is welded to form a first electrode terminal connection assembly 121. On a second side 102 of the cell group 10, at least one electrode terminal 12 of each of the two cells 1 has a bent shape, and the bent electrode terminal 12 is connected by welding.

[0082] In some embodiments, when one cell group 10 includes three cells 1, on a first side 101 of the cell group 10, at least one electrode terminal 12 of two cells 1 closest to the outside of the three cells 1 is bent, the electrode terminal 12 of the middle cell 1 is not bent, and the electrode terminals 12 of the three cells 1 are connected by welding. On a second side 102 of the cell group 10, at least one electrode terminal 12 of two cells 1 closest to the outside of the three cells 1 is bent, the electrode terminal 12 of the middle cell 1 is not bent, and the electrode terminals 12 of the three cells 1 are connected by welding. It is understood that the above is not intended to limit the present application.

[0083] In some embodiments, of two adjacent cell groups 10, the first fixing member 21 of one cell group 10 is connected to the second fixing member 22 of the other cell group 10, and a gap 26 is formed between the first fixing member 21 and the second fixing member 22 along the first direction F1, which is advantageous for improving heat dissipation of the cell groups 10. Preferably, a convex portion is provided on one of the first fixing member 21 and the second fixing member 22, and the convex portion forms the gap 26 between the first fixing member 21 and the second fixing member 22. As shown in FIG. 11 , the length of the gap 26 is indicated by T4. Preferably, a convex portion is provided on one of the first fixing member 21 and the second fixing member 22, and a concave portion is provided on the other of the first fixing member 21 and the second fixing member 22, and the length of the convex portion is longer than the length of the concave portion along the first direction F1. Engagement between the convex portion and the concave portion forms the gap 26 between the first fixing member 21 and the second fixing member 22, thereby improving connection stability of the two adjacent cell groups 10. Preferably, the first fixing member 21 includes a convex portion and a concave portion, and the second fixing member 22 includes a convex portion and a concave portion, and engagement between the convex portion and the concave portion forms a gap 26 between the first fixing member 21 and the second fixing member 22, thereby further improving the connection stability of two adjacent cell groups 10.

[0084] In some embodiments, along the first direction F1, the cell group 10 includes a first side 1001 and a second side 1002 facing each other, the first fixing member 21 includes a first convex portion 41 and a first concave portion 42, and the second fixing member 22 includes a second convex portion 43 and a second concave portion 44, the first convex portion 41 and the second convex portion 43 being located on the first side 1001, and the first concave portion 42 and the second concave portion 44 being located on the second side 1002. In two adjacent cell groups 10, the first convex portion 41 is provided in the second concave portion 44, and the second convex portion 43 is provided in the first concave portion 42, where, along the first direction F1, the length of the first convex portion 41 is longer than the length of the second concave portion 44 and the length of the second convex portion 43 is longer than the length of the first concave portion 42. Engagement between the convex portion and the concave portion forms a gap 26 between the first fixing member 21 and the second fixing member 22, which is advantageous for improving heat dissipation of the cell group 10. Preferably, along the first direction F1, the length of the first convex portion 41 is equal to the length of the second concave portion 44, and the length of the second convex portion 43 is equal to the length of the first concave portion 42, thereby further improving the connection stability of two adjacent cell groups 10.

[0085] 2 , along the first direction F1, the cell group 10 includes a first side 1001 and a second side 1002 facing each other, the first fixing member 21 includes a first protrusion 41 and a first recess 42, and the second fixing member 22 includes a second protrusion 43 and a second recess 44, the first protrusion 41 and the second recess 44 being located on the first side 1001, and the first recess 42 and the second protrusion 43 being located on the second side 1002. In two adjacent cell groups 10, the second protrusion 43 is provided in the first recess 42, and the length of the second protrusion 43 is longer than the length of the first recess 42 along the first direction F1. Engagement between the second protrusion 43 and the first recess 42 forms a gap 26 between the first fixing member 21 and the second fixing member 22, which is advantageous for improving heat dissipation of the cell groups 10. Preferably, the length of the second protrusion 43 is equal to the length of the first recess 42 along the first direction F1, thereby further improving the connection stability of two adjacent cell groups 10.

[0086] In some embodiments, the first fixing member 21 includes a first sleeve 210. In some embodiments, the thickness of the first sleeve 210 along the first direction F1 is greater than or equal to 1 mm and less than or equal to 5 mm. Preferably, the thickness of the first sleeve 210 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is advantageous for improving the protection effect for the electrode terminals. Preferably, the thickness of the first sleeve 210 along the first direction F1 is indicated by T5 in FIG. 11.

[0087] In some embodiments, the second fixing member 22 includes a second sleeve 220. In some embodiments, the thickness of the second sleeve 220 along the first direction F1 is greater than or equal to 1 mm and less than or equal to 5 mm. Preferably, the thickness of the second sleeve 220 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is advantageous for improving the protection effect for the electrode terminal. Preferably, the thickness of the second sleeve 220 along the first direction F1 is indicated by T5 in FIG. 11.

[0088] 2 and 3, in some embodiments, the electrochemical device 100 further includes an elastic member 5, which is disposed between two adjacent cell groups 10 and connected to at least one of the two cell groups 10. The elastic member 5 is compressed and deformed by the cell groups 10, thereby providing a deformation space for the expanded cells 1.

[0089] Preferably, the elastic member 5 is connected to the cell groups 10 by adhesion, so that it comes into contact with at least one of the two cell groups 10. The adhesion may be by adhesive, double-sided tape, or the like, but is not limited thereto.

[0090] In some embodiments, the elastic member 5 includes a foam. Foam is a material made of expanded plastic particles, and has a series of characteristics such as high elasticity, light weight, quick crimping and fixing, easy to use, flexible, ultra-thin volume, and high reliability. For example, types of foam include PU foam, antistatic foam, conductive foam, EPE foam, antistatic EPE foam, CR foam, EVA foam, cross-linked PE foam, SBR foam, EPDM foam, etc. The present application does not limit the type of foam included in the elastic member 5.

[0091] In some embodiments, the elastic member 5 includes a spring. For example, the elastic member 5 includes a first plate, a second plate, and a spring, the spring being connected between the first plate and the second plate, the first plate being connected to one of two adjacent cell groups 10 in the first direction F1, and the second plate being connected to the other of the two cell groups 10. When the cells 1 expand, the first plate and / or the second plate are moved to compress the spring, which deforms to support the expanded cells 1, buffering the pressure caused by the expansion of the cells 1 and improving the situation in which each cell 1 of the electrochemical device 100 expands and is displaced in the first direction F1.

[0092] In some embodiments, as shown in FIG. 11 , in the electrochemical device 100, when the thickness of the elastic member 5 when not compressed by the cells is T1, the gap in the first direction F1 formed between two adjacent cell groups along the first direction F1 is T2, the thickness of the cells 1 when no charge / discharge cycles are performed is T3, and X is half the total number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1, T1, T2, T3, and X satisfy T2-X*T3*20%≦T1≦T2.

[0093] Specifically, X may be an integer. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 is 2 and 2, respectively, the sum of the two cell groups 10 is 4, so X = 4 / 2 = 2. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 is 2 and 4, respectively, the sum of the two cell groups 10 is 6, so X = 6 / 2 = 3. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 is 1 and 1, respectively, the sum of the two cell groups 10 is 2, so X = 2 / 2 = 1. Alternatively, X may be a decimal number. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 is 2 and 3, respectively, the sum of the two cell groups 10 is 5, so X = 5 / 2 = 2.5. It is clear that these examples are not intended to limit the present application. It can be seen that if only one of the numbers of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 is odd, X is a decimal number; otherwise, X is an integer.

[0094] Specifically, when T1=T2-X*T3*20%, in the initial state of the electrochemical device 100, the elastic member 5 can only contact the cells 1 in the first cell group 10 of the two cell groups 10 adjacent to each other in the first direction F1 (referred to as the first cell group 10 and the second cell group 10, respectively). Meanwhile, when the cells 1 in the cell groups 10 expand to 20% of their initial thickness, the elastic member 5 comes into contact with the cells 1 in the second cell group 10. During the subsequent expansion process, the elastic member 5 is compressed to support the expanded cells 1, thereby reducing the risk of the exterior casing of the cells 1 (e.g., made of a metal film) expanding and bursting. It also buffers the pressure caused by the expansion of the cells 1 and improves the situation in which each cell 1 of the electrochemical device 100 expands and undergoes overlapping displacement in the first direction F1, thereby meeting the usage needs of the electrochemical device 100.

[0095] When T1=T2, in the initial state of the electrochemical device 100, the elastic member 5 can simultaneously contact two adjacent cell groups 10 in the first direction F1, and when a cell 1 in the cell group 10 expands, the elastic member 5 is compressed to support the expanded cell 1, thereby reducing the risk of the exterior casing of the cell 1 (e.g., made of a metal film) expanding and bursting, and also buffering the pressure caused by the expansion of the cell 1 and improving the situation in which each cell 1 of the electrochemical device 100 expands and undergoes overlapping displacement in the first direction F1, thereby meeting the usage needs of the electrochemical device 100.

[0096] Preferably, T1, T2, T3, and X satisfy the relationship T2-X*T3*15%≦T1≦T2-X*T3*0.5%.

[0097] In some embodiments, when T1=T2-X*T3*15%, in the initial state of the electrochemical device 100, one side of the elastic member 5 does not contact the cells 1 in the cell group 10 along the first direction F1, and when the cells 1 in the cell group 10 expand to 15% of their initial thickness, the elastic member 5 can simultaneously contact the cells 1 in the cell group 10 on both sides, and the elastic member 5 is compressed to support the expanded cells 1, thereby reducing the risk of the exterior packaging of the cells 1 (e.g., made of a metal film) expanding and bursting, and also buffering the pressure caused by the expansion of the cells 1 and improving the situation in which each cell 1 of the electrochemical device 100 expands and displaces overlappingly in the first direction F1, thereby meeting the usage needs of the electrochemical device 100.

[0098] In some embodiments, when T1=T2-X*T3*0.5%, in the initial state of the electrochemical device 100, one side of the elastic member 5 does not contact cell 1 in the cell group 10 along the first direction F1, which meets the needs and can reduce costs compared to when both sides of the elastic member 5 contact cell 1 (i.e., T1=T2), and is more beneficial for heat dissipation of cell 1 compared to when both sides of the elastic member 5 contact cell 1.

[0099] 1 and 12 to 13, in some embodiments, the electrochemical device 100 further includes a housing 4, and the housing 4 includes a first wall surface 401 and a second wall surface 402 that are disposed opposite each other along a first direction F1. An elastic structure such as foam may be disposed between the first wall surface 401 and the M cell groups 10, and an elastic structure such as foam may be disposed between the second wall surface 402 and the M cell groups 10, but this is not limited thereto.

[0100] In some embodiments, the housing 4 includes a third wall surface 403 and a fourth wall surface 404 that are arranged opposite each other along a third direction F3, where the third direction F3 is perpendicular to the first direction F1 and the second direction F2. A fifth protrusion 71 is provided on at least one of the third wall surface 403 and the fourth wall surface 404, and the fifth protrusion 71 is provided between the adjacent first fixing member 21 and second fixing member 22 along the first direction F1, thereby restricting movement of the cell group 10.

[0101] 2 , in some embodiments, the first fixing member 21 has at least one first through-hole 61 extending through the first fixing member 21 along the third direction F3, and / or the second fixing member 22 has at least one first through-hole 61 extending through the second fixing member 22 along the third direction F3, where the third direction F3 is perpendicular to the first direction F1 and the second direction F2. This is advantageous for heat dissipation in the electrode terminal 12 bonded to the first fixing member 21 and / or the second fixing member 22.

[0102] 1 and 12, in some preferred embodiments, second through holes 62 are provided in the third wall surface 403 and / or the fourth wall surface 404, and the second through holes 62 communicate with the first through holes 61. In the present application, such a structure can further enhance the heat dissipation effect.

[0103] It is understood that the above are only some preferred embodiments of the electrochemical device 100 provided in the first aspect of the present invention, and are not intended to limit the present invention.

[0104] 14 to 25, according to a second aspect of the present application, an electrochemical device 100 is provided. The electrochemical device 100 includes N cells 1, A first fixing members 21, A second fixing members 22, and (L-1)*A third fixing members 23, where N, M, and L are all positive integers, and 2≦M≦N, L≧2. The N cells 1 are divided into M cell groups 10, which are divided into A rows and L columns. The cell groups 10 include a first side 101 and a second side 102 that are arranged opposite each other along a second direction F2. Each cell group 10 includes at least one cell 1. The cells 1 in the cell group 10 are arranged along the first direction F1, and the second direction F2 is perpendicular to the first direction F1. The cell 1 includes a cell case 11 and two electrode terminals 12, and the two electrode terminals 12 are installed facing each other on both sides of the cell case 11 in the second direction F2. Here, in one row of cell groups A1, the first fixing member 21 is located on the first side 101 of the first cell group 10 among the cell groups A1 in the row and is adhered to at least a part of the electrode terminals 12 on the first side 101 of the first cell group 10, and the second fixing member 22 is located on the second side 102 of the last cell group 10 among the cell groups A1 in the row and is adhered to at least a part of the electrode terminals 12 on the second side 102 of the last cell group 10. In one row of cell groups A1, the electrode terminals 12 of two adjacent cell groups 10 are connected, and the third fixing member 23 is connected to each of the two adjacent cell groups 10, with the third fixing member 23 adhered to at least a portion of the electrode terminal 12 on the second side 102 of one of the two adjacent cell groups 10, and the third fixing member 23 adhered to at least a portion of the electrode terminal 12 on the first side 101 of the other of the two adjacent cell groups 10. The first fixing member 21, the second fixing member 22, and the third fixing member 23 are advantageous in improving protection for the electrode terminals 12 of each of the cell groups 10, and improve the stability and service life of the electrochemical device 100.

[0105] The electrochemical device 100 provided in the second embodiment of the present invention will be described in detail below, but it should be understood that the following description does not limit the present invention.

[0106] The electrochemical device 100 provided in the second embodiment of the present application may be a secondary battery, the type of which may be, but is not limited to, a lithium ion battery, a sodium ion battery, a lead acid battery, or the like.

[0107] In some embodiments, each cell includes an electrode assembly 13, a cell casing 11, and an electrode terminal 12. The electrode assembly 13 is installed in the cell casing 11, and the electrode terminal 12 is connected to the electrode assembly 13 and extends from the cell casing 11. The cell includes two electrode terminals 12, one of which is a positive electrode terminal and the other of which is a negative electrode terminal. Preferably, the positive electrode terminal and the negative electrode terminal are provided at the same end of the cell casing 11 along the second direction F2. Preferably, the positive electrode terminal and the negative electrode terminal are provided at opposite ends of the cell casing 11 along the second direction F2. In this specification, the positive electrode terminal and the negative electrode terminal are provided at opposite ends of the cell casing 11 as an example.

[0108] Referring to FIG. 5, the electrode terminal 12 includes a first region 1201 located inside the cell casing 11 and a second region 1202 located outside the cell casing 11, and the first region 1201 is connected to the electrode assembly 13.

[0109] In some embodiments, the electrode assembly 13 may include a positive electrode piece, a negative electrode piece, and a separator positioned between the positive electrode piece and the negative electrode piece. The electrode assembly 13 may be formed by winding the positive electrode piece, the separator, and the negative electrode piece, or by stacking the positive electrode piece, the separator, and the negative electrode piece. Details regarding the positive electrode piece, the separator, and the negative electrode piece may be referenced in the related art, but are not limited to these in the present application. For example, the positive electrode piece may include a positive electrode active material layer and a positive electrode current collector. The positive electrode active material layer may be disposed on the positive electrode current collector, for example, the positive electrode active material layer may be coated on the positive electrode current collector. An uncoated foil area may be present on the edge of the positive electrode current collector, and an electrode terminal 12 may be connected to the uncoated foil area. For example, the electrode terminal 12 may be used as a positive electrode terminal or an electrode terminal for sampling. For example, the negative electrode piece may include a negative electrode active material layer and a negative electrode current collector, the negative electrode active material layer is disposed on the negative electrode current collector, for example, the negative electrode active material layer may be coated on the negative electrode current collector, and the edge of the negative electrode current collector has an uncoated foil material area, and an electrode terminal 12 is electrically connected to the uncoated foil material area, for example, the electrode terminal 12 may be used as a negative electrode terminal or an electrode terminal for sampling.

[0110] In some embodiments, in the same cell group 10, the projection of the first fixing member 21 is spaced apart from the projection of the electrode assembly 13 of cell 1 in the cell group 10 along the first direction F1, thereby reducing the effect of the first fixing member 21 on the expansion of the electrode assembly 13. As shown in Figure 16, the electrode assembly 13 is indicated by a dashed box.

[0111] In some embodiments, in the same cell group 10, the projection of the second fixing member 22 is spaced apart from the projection of the electrode assembly 13 of cell 1 in the cell group 10 along the first direction F1, thereby reducing the effect of the second fixing member 22 on the expansion of the electrode assembly 13. As shown in Figure 16, the electrode assembly 13 is indicated by a dashed box.

[0112] In some embodiments, in the same cell group 10, the projection of the third fixing member 23 is spaced apart from the projection of the electrode assembly 13 of cell 1 in the cell group 10 along the first direction F1, thereby reducing the effect of the third fixing member 23 on the expansion of the electrode assembly 13. As shown in Figure 16, the electrode assembly 13 is indicated by a dashed box.

[0113] In some embodiments, referring to FIG. 15 , M=16, and 16 cell groups 10 are arranged in even-numbered rows. Specifically, the 16 cell groups 10 are arranged in eight rows, each row including two cell groups 10, and the eight rows of cell groups are stacked along the first direction F1. The electrochemical device 100 includes eight first fixing members 21 and eight second fixing members 22. Adjacent cell groups 10 are connected along the first direction F1 by conductive members 24. In two adjacent rows of cell groups 10, the electrode terminal 12 on the first side 101 of one cell group 10 is connected to the electrode terminal 12 on the second side 102 of the other cell group 10 by the conductive members 24. Connection regions 25 are formed on the conductive members 24, and one first fixing member 21 is bonded to at least a portion of the connection region 25, and seven first fixing members 21 are bonded to at least a portion of the seven connection regions 25. Along the first direction F1, adjacent cell groups 10 are connected by conductive members 24, and in two adjacent rows of cell groups 10, the electrode terminal 12 on the first side 101 of one cell group 10 is connected to the electrode terminal 12 on the second side 102 of the other cell group 10 by the conductive members 24, forming a connection area 25 on the conductive members 24, with one second fixing member 22 adhered to at least a portion of the connection area 25, and seven second fixing members 22 adhered to at least a portion of the seven connection areas. When eight rows of cell groups are connected, one positive electrode connection end and one negative electrode connection end are formed, with one first fixing member 21 adhered to the electrode terminal 12 of the positive electrode connection end 27 and one second fixing member 22 adhered to the electrode terminal 12 of the negative electrode connection end 28.

[0114] In some embodiments, M=18, and 18 cell groups 10 are arranged in odd-numbered rows. Specifically, the 18 cell groups 10 are arranged in nine rows, each row including two cell groups 10, and the nine rows of cell groups are stacked along the first direction F1. The electrochemical device 100 includes nine first fixing members, nine second fixing members, and nine third fixing members. Adjacent cell groups 10 are connected along the first direction F1 by conductive members 24. In two adjacent rows of cell groups 10, the electrode terminal 12 on the first side 101 of one cell group 10 is connected to the electrode terminal 12 on the second side 102 of the other cell group 10 by the conductive members 24. Connection regions 25 are formed on the conductive members 24, and one first fixing member 21 is bonded to at least a portion of the connection region 25, and eight first fixing members 21 are bonded to at least a portion of the eight connection regions 25. Along the first direction F1, adjacent cell groups 10 are connected by conductive members 24, and in two adjacent rows of cell groups 10, the electrode terminal 12 on the first side 101 of one cell group 10 is connected to the electrode terminal 12 on the second side 102 of the other cell group 10 by the conductive members 24, forming a connection region 25 on the conductive members 24, with one second fixing member 22 adhered to at least a portion of the connection region 25, and eight second fixing members 22 adhered to at least a portion of the eight connection regions. When nine rows of cell groups are connected, one positive electrode connection end and one negative electrode connection end are formed, and one second fixing member 22 and one first fixing member 21 is adhered to the electrode terminal 12 of the positive electrode connection end, and the other is adhered to the electrode terminal 12 of the negative electrode connection end.

[0115] 15, the cell groups in row A are stacked in order along the first direction F1. The cell group A1 in the first row and the cell group A2 in the second row will be described as an example. The cell group A1 in the first row and the cell group A2 in the second row are stacked in the first direction F1, and the cell group A1 in the first row includes at least two cell groups 10 arranged in the second direction F2, and the cell group A2 in the second row includes at least two cell groups 10 arranged in the second direction F2. In this specification, the cell group A1 in the first row includes two cell groups 10 arranged in the second direction F2, and the cell group A2 in the second row includes two cell groups 10 arranged in the second direction F2.

[0116] Referring to Figure 15, cell group A1 in the first row includes cell group A1-1 and cell group A1-2, and cell group A2 in the second row includes cell group A2-1 and cell group A2-2. Along the first direction F1, the electrode terminals 12 in two adjacent cell groups A1-1 and A2-1 are connected by conductive members 24, and connection areas 25 are formed on the conductive members 24. Connection methods include laser welding connection and ultrasonic welding connection.

[0117] In some embodiments, along the first direction F1, the electrode terminals 12 in two adjacent cell groups A1-2 and A2-2 are connected by conductive members 24, and connection areas 25 are formed on the conductive members 24, and the connection methods include laser welding connection and ultrasonic welding connection.

[0118] In some embodiments, the electrode terminal 12 is connected to the conductive member 24 by a mechanical structure, a recess is provided on one of the electrode terminal 12 and the conductive member 24, and a protrusion is provided on the other of the electrode terminal 12 and the conductive member 24, and the recess and the protrusion are connected to form a connection region 25 on the conductive member 24.

[0119] In some embodiments, the electrode terminals 12 are connected to the conductive member 24 with a conductive adhesive, and at least one electrode terminal 12 of each of the two cell groups 10 is respectively adhered to the conductive member 24 with a conductive adhesive, thereby connecting the electrode terminals 12 with the conductive member 24, and a connection region 25 is formed on the conductive member 24.

[0120] In some embodiments, the electrode terminals 12 of two adjacent cell groups 10 are connected together and then connected to the conductive member 24 via another conductive member by welding.

[0121] In some embodiments, one of the two electrode terminals 12 in the cell 1 is a positive electrode terminal and the other is a negative electrode terminal, and the electrochemical device 100 in the present application is configured by connecting N cells 1 in series or parallel to each other, so that the positive electrode terminal of at least one cell 1 ultimately forms the positive electrode of the electrochemical device 100, and the negative electrode terminal of at least one cell 1 ultimately forms the negative electrode of the electrochemical device 100.

[0122] In some embodiments, of two adjacent cell groups 10, the first fixing member 21 of one cell group 10 and the second fixing member 22 of the other cell group 10 are connected along the first direction F1, and a gap is formed between the first fixing member 21 and the second fixing member 22 along the first direction F1, which is advantageous for improving heat dissipation of the cell groups 10. Preferably, a convex portion is provided on one of the first fixing member 21 and the second fixing member 22, and the convex portion forms a gap 26 between the first fixing member 21 and the second fixing member 22. Preferably, a convex portion is provided on one of the first fixing member 21 and the second fixing member 22, and a recess is provided on the other of the first fixing member 21 and the second fixing member 22, and the length of the convex portion is longer than the length of the recess along the first direction F1, and engagement between the convex portion and the recess forms a gap 26 between the first fixing member 21 and the second fixing member 22, thereby improving connection stability of the two adjacent cell groups 10. Preferably, the first fixing member 21 includes a convex portion and a concave portion, and the second fixing member 22 includes a convex portion and a concave portion, and engagement between the convex portion and the concave portion forms a gap 26 between the first fixing member 21 and the second fixing member 22, thereby further improving the connection stability of two adjacent cell groups 10.

[0123] In some embodiments, along the first direction F1, the cell group 10 includes a first side 1001 and a second side 1002 facing each other, the first fixing member 21 includes a first convex portion 41 and a first concave portion 42, and the second fixing member 22 includes a second convex portion 43 and a second concave portion 44, the first convex portion 41 and the second convex portion 43 being located on the first side 1001, and the first concave portion 42 and the second concave portion 44 being located on the second side 1002. In two adjacent cell groups 10, the first convex portion 41 is provided in the second concave portion 44, and the second convex portion 43 is provided in the first concave portion 42, where, along the first direction F1, the length of the first convex portion 41 is longer than the length of the second concave portion 44 and the length of the second convex portion 43 is longer than the length of the first concave portion 42. Engagement between the convex portion and the concave portion forms a gap 26 between the first fixing member 21 and the second fixing member 22, which is advantageous for improving heat dissipation of the cell group 10. Preferably, along the first direction F1, the length of the first convex portion is equal to the length of the second concave portion, and the length of the second convex portion is equal to the length of the first concave portion, thereby further improving the connection stability of two adjacent cell groups 10.

[0124] In some embodiments, as shown in FIGS. 15 and 16 , along a first direction F1, the cell group 10 includes a first side 1001 and a second side 1002 that face each other, the first fixing member 21 includes a first convex portion 41 and a first concave portion 42, and the second fixing member 22 includes a second convex portion 43 and a second concave portion 44, the first convex portion 41 and the second concave portion 44 being located on the first side 1001, and the first concave portion 42 and the second convex portion 43 being located on the second side 1002. In two adjacent cell groups 10, the second convex portion 43 is provided in the first concave portion 42, and here, along the first direction F1, the length of the second convex portion 43 is longer than the length of the first concave portion 42, and engagement between the second convex portion 43 and the first concave portion 42 forms a gap 26 between the first fixing member 21 and the second fixing member 22, which is advantageous for improving heat dissipation of the cell groups 10. Preferably, the length of the second protrusion 43 is equal to the length of the first recess 42 along the first direction F1, thereby further improving the connection stability of two adjacent cell groups 10.

[0125] In some embodiments, of two adjacent cell groups 10, the third fixing members 23 of one cell group 10 are connected to the third fixing members 23 of the other cell group 10 along the first direction F1, and a gap 29 is formed between the two third fixing members 23 along the first direction F1, which is advantageous for improving heat dissipation of the cell groups 10. Preferably, one of the two third fixing members 23 has a convex portion, and the convex portion forms the gap 29 between the two third fixing members 23. Preferably, one of the two third fixing members 23 has a convex portion, and the other of the two third fixing members 23 has a concave portion, and the length of the convex portion is longer than the length of the concave portion along the first direction F1, and engagement between the convex portion and the concave portion forms the gap 29 between the two third fixing members 23, thereby improving connection stability of the two adjacent cell groups 10. Preferably, each of the two third fixing members 23 includes a convex portion and a concave portion, and engagement between the convex portion and the concave portion forms a gap between the two third fixing members 23, thereby further improving the connection stability of the two adjacent cell groups 10.

[0126] In some embodiments, along the first direction F1, the cell group 10 includes a first side 1001 and a second side 1002 facing each other, and the third fixing member 23 includes a third protrusion 45, a third recess 46, a fourth protrusion 47, and a fourth recess 48, where the third protrusion 45 and the fourth protrusion 47 are located on the first side 1001 and the third recess 46 and the fourth recess 48 are located on the second side 1002. In two adjacent cell groups 10, the third protrusion 45 is provided in the fourth recess 48, and the fourth protrusion 47 is provided in the third recess 46, where, along the first direction F1, the length of the third protrusion 45 is longer than the length of the fourth recess 48 and the length of the fourth protrusion 47 is longer than the length of the third recess 46. Engagement of the protrusion and the recess forms a gap 29 between the two adjacent third fixing members 23, which is advantageous for improving heat dissipation of the cell groups 10. Preferably, the length of the third protrusion 45 is equal to the length of the fourth recess 48, and the length of the fourth protrusion 47 is equal to the length of the third recess 46, along the first direction F1, thereby further improving the connection stability of two adjacent cell groups 10. As shown in Figure 23, the length of the gap 29 is indicated by T7.

[0127] In some embodiments, as shown in FIG. 20 , along the first direction F1, the cell group 10 includes opposing first and second sides 1001 and 1002, and the third fixing member 23 includes a third protrusion 45, a third recess 46, a fourth protrusion 47, and a fourth recess 48, with the third recess 46 and the fourth protrusion 47 located on the first side 1001 and the third protrusion 45 and the fourth recess 48 located on the second side 1002. Of two adjacent cell groups 10, the fourth convex portion 47 of one cell group is provided in the third recess 46 of the other cell group 10, and the third convex portion 45 of one cell group is provided in the fourth recess 48 of the other cell group 10, where, along the first direction F1, the length of the fourth convex portion 47 is longer than the length of the third recess 46, and the length of the third convex portion 45 is longer than the length of the fourth recess 48, and the engagement between the fourth convex portion 47 and the third recess 46 and the engagement between the third convex portion 45 and the fourth recess 48 forms a gap 29 between the two adjacent third fixing members 23, which is advantageous for improving heat dissipation of the cell groups 10. Preferably, the length of the fourth convex portion 47 is equal to the length of the third recess 46 along the first direction F1, further improving the connection stability of the two adjacent cell groups 10.

[0128] In some embodiments, the first fixing member 21 includes a first sleeve 210. In some embodiments, the thickness of the first sleeve 210 along the first direction F1 is greater than or equal to 1 mm and less than or equal to 5 mm. Preferably, the thickness of the first sleeve 210 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is advantageous for improving the protection effect for the electrode terminals.

[0129] In some embodiments, the second fixing member 22 includes a second sleeve 220. In some embodiments, the thickness of the second sleeve 220 along the first direction F1 is greater than or equal to 1 mm and less than or equal to 5 mm. Preferably, the thickness of the second sleeve 220 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is advantageous for improving the protection effect for the electrode terminals.

[0130] In some embodiments, as shown in FIG. 20 , the third fixing member 23 includes a third sleeve 231 and a fourth sleeve 232. In some embodiments, the thickness of the third sleeve 231 along the first direction F1 is greater than or equal to 1 mm and less than or equal to 5 mm. Preferably, the thickness of the third sleeve 231 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is advantageous for improving the protective effect for the electrode terminals. In some embodiments, the thickness of the fourth sleeve 232 along the first direction F1 is greater than or equal to 1 mm and less than or equal to 5 mm. Preferably, the thickness of the fourth sleeve 232 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is advantageous for improving the protective effect for the electrode terminals. Preferably, the thickness of the third sleeve 231 along the first direction F1 is indicated by T6 in FIG. 23 . Preferably, the thickness of the fourth sleeve 232 along the first direction F1 is indicated by T6 in FIG.

[0131] In some embodiments, the first fixing member 21 is provided on the first side 101 of the cell group 10 and the conductive member 24 by an injection molding process or a pouring process, and is thereby adhered to at least a portion of the connection area 25 near the first side 101 of the cell group 10, thereby providing improved protection for the electrode terminal 12 and the connection area 25 formed on the conductive member 24.

[0132] In some embodiments, the first fixing member 21 is provided on the first side 101 of the cell group 10 and the conductive member 24 by an injection molding process or a pouring process, and is thereby adhered to the connection region 25 near the first side 101 of the cell group 10, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11, thereby providing improved protection for the connection region 25 formed on the electrode terminal 12 and the conductive member 24.

[0133] In some embodiments, the second fixing member 22 is provided on the second side 102 of the cell group 10 and the conductive member 24 by an injection molding process or a pouring process, and is thereby adhered to at least a portion of the connection area 25 near the second side 102 of the cell group 10, thereby providing improved protection for the electrode terminal 12 and the connection area 25 formed on the conductive member 24.

[0134] In some embodiments, the second fixing member 22 is provided on the second side 102 of the cell group 10 and the conductive member 24 by an injection molding process or a pouring process, thereby adhering to the connection region 25 near the second side 102 of the cell group 10, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11, thereby providing improved protection for the connection region 25 formed on the electrode terminal 12 and the conductive member 24.

[0135] In some embodiments, the third fixing member 23 is provided on the first side 101 and the second side 102 of adjacent cell groups 10 in the same row by an injection molding process or an injection process, thereby adhering to at least a portion of the area where the adjacent cell groups 10 are connected to each other, thereby improving the structural strength of the first side 101 and the second side 102 of the adjacent cell groups 10 and improving the service life of the cell groups 10.

[0136] In some embodiments, the third fixing members 23 are provided on the first side 101 and the second side 102 of adjacent cells 10 in the same row by an injection molding process or a pouring process, so that the third fixing members 23 are adhered to the second regions 1202 and at least a portion of the cell casing 11, thereby improving protection for the electrode terminals 12 and the connection regions 25 formed on the conductive members 24.

[0137] In some embodiments, injection molding can form a bond by melting an insulating material in an injection molding device, coating the cell group 10 and conductive member 24 with the molten insulating material, and hardening the insulating material to form the first fixing member 21 or the second fixing member 22.

[0138] In some embodiments, the injection molding process of the first fixing member 21 includes the following: first, at least one electrode terminal 12 of each of two adjacent cell groups 10 in the first direction F1 is connected by a conductive member 24, for example, by welding the electrode terminals of the two cell groups 10 to the conductive member 24 to form a connection; then, the first side 101 of the cell group 10 and the conductive member 24 are injection molded, and the first fixing member 21 is bonded to the connection region 25 close to the first side 101 of the cell group 10, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11; and the material is hardened to form the first fixing member 21. This makes the structure of the injection-molded first fixing member 21 more stable and is advantageous in improving the protective effect.

[0139] In some embodiments, the injection molding process of the second fixing member 22 includes the following: first, at least one electrode terminal 12 of each of two adjacent cell groups 10 in the first direction F1 is connected by a conductive member 24, for example, by welding the electrode terminals of the two cell groups 10 to the conductive member 24 to form a connection; then, the second side 102 of the cell group 10 and the conductive member 24 are injection molded, thereby adhering to the connection region 25 close to the second side 102 of the cell group 10, the second region 1202 of the electrode terminal 12, and at least a portion of the cell casing 11; and then, the material is hardened to form the second fixing member 22, which makes the structure of the injection-molded second fixing member 22 more stable and is advantageous in improving the protective effect.

[0140] In some embodiments, injection molding can form a bond by melting insulating material in an injection molding device, coating the first side 101 and second side 102 of adjacent cell groups 10 with the molten insulating material, and curing the insulating material to form third fixing member 23.

[0141] In some embodiments, injection molding of the third fixing member 23 includes a manufacturing process in which the electrode terminals on the first side 101 and the second side 102 of adjacent cell groups 10 in the same row are first connected, for example by welding, and then the first side 101 and the second side 102 are injection molded, and the connection area formed by the connection of the electrode terminals is covered with an injection molding material, and the material is hardened to form the third fixing member 23. The third fixing member 23 covers the connection area formed by the connection of the electrode terminals and the portion of the electrode terminal located outside the cell case, which is advantageous for improving the protective effect.

[0142] In some embodiments, the bond can be formed by coating the cells 10 and the conductive member 24 with an insulating material (e.g., a flowable insulating material) through an injection process, and then curing the insulating material to form the first fixing member 21 or the second fixing member 22. Preferably, the insulating material includes a sealant.

[0143] In some embodiments, the bond can be formed by applying an insulating material (e.g., a flowable insulating material) to the first side 101 and the second side 102 of adjacent cells 10 via an injection process, and then curing the insulating material to form the third fastening member 23. Preferably, the insulating material comprises an encapsulant.

[0144] In some embodiments, the shapes and structures of the first fixing members 21 may be the same or different, but are not limited thereto. The shapes and structures of the second fixing members 22 may be the same or different, but are not limited thereto.

[0145] In some embodiments, at least one cell group 10 includes a plurality of cells 1, and on a first side 101 of the cell group 10, at least one electrode terminal 12 of at least one cell 1 of the plurality of cells 1 is in a bent shape, and / or at least one cell group 10 includes a plurality of cells 1, and on a second side 102 of the cell group 10, at least one electrode terminal 12 of at least one cell 1 of the plurality of cells 1 is in a bent shape.

[0146] This may be understood with reference to the content relating to the electrochemical device 100 provided in the first embodiment described above. Referring to Fig. 17, Fig. 17 shows a case where one cell group 10 includes two cells 1. Here, on a first side 101 of the cell group 10, at least one electrode terminal 12 of each of the two cells 1 has a bent shape, and the bent electrode terminal 12 is connected by welding to form a first electrode terminal connection assembly 121. On a second side 102 of the cell group 10, at least one electrode terminal 12 of each of the two cells 1 has a bent shape, and the bent electrode terminal 12 is connected by welding to form a second electrode terminal connection assembly 122. Referring to Fig. 18, Fig. 18 shows a case where one cell group 10 includes three cells 1. On a first side 101 of the cell group 10, of the three cells 1, at least one electrode terminal 12 of two cells 1 closest to the outside is bent, while the electrode terminal 12 of the middle cell 1 is not bent, and the electrode terminals 12 of the three cells 1 are electrically connected by welding. On a second side 102 of the cell group 10, of the three cells 1, at least one electrode terminal 12 of two cells 1 closest to the outside is bent, while the electrode terminal 12 of the middle cell 1 is not bent, and the electrode terminals 12 of the three cells 1 are electrically connected by welding. It is understood that the above is not intended to limit the present application.

[0147] 15 , in some embodiments, the electrochemical device 100 further includes an elastic member 5. The elastic member 5 is disposed between two adjacent cell groups 10 in the same row, and the elastic member 5 contacts at least one of the two cell groups 10.

[0148] In this embodiment, two adjacent cell groups 10 among the cell groups 10 in the same column are two cell groups 10 among the cell groups 10 in the same column that are adjacent in the first direction F1.

[0149] Specifically, in the present application, when the electrochemical device 100 is in use, the soft-packed cells 1 may expand due to long-term use. Therefore, in the examples of the present application, an elastic member 5 is installed between two adjacent cell groups 10 in the same row, and the elastic member 5 is brought into contact with at least one of the two cell groups 10. When the cells 1 of the cell group 10 expand, the elastic member 5 is compressed by the cell group 10, and the elastic member 5 deforms to support the expanded cells 1, thereby cushioning the pressure caused by the expansion of the cells 1 and improving the situation in which each cell 1 of the electrochemical device 100 expands and undergoes overlapping displacement in the first direction F1.

[0150] Preferably, the elastic member 5 is connected to the cell groups 10 by adhesion, so that it comes into contact with at least one of the two cell groups 10. The adhesion may be by adhesive, double-sided tape, or the like, but is not limited thereto.

[0151] In the present application, preferably, an elastic member 5 can be provided between each two adjacent cell groups 10 among the cell groups 10 in each row.

[0152] In some embodiments, the elastic member 5 may include a foam. Foam is a material made of expanded plastic particles, and has a series of characteristics such as high elasticity, light weight, quick crimping and fixing, ease of use, flexibility, ultra-thin volume, and high reliability. For example, the types of foam may include PU foam, antistatic foam, conductive foam, EPE foam, antistatic EPE foam, CR foam, EVA foam, cross-linked PE foam, SBR foam, EPDM foam, etc. In this application, the type of foam included in the elastic member 5 is not limited as long as it meets the usage needs.

[0153] In some embodiments, the elastic member 5 may include a spring. For example, the elastic member 5 may include a first plate, a second plate, and a spring, where the spring is connected between the first plate and the second plate, the first plate is connected to one of two adjacent cell groups 10 in the first direction F1 among the cell groups 10 in the same row, and the second plate is connected to the other of the two cell groups 10. When the cells 1 expand, the first plate and / or the second plate move to compress the spring, which deforms to support the expanded cells 1, buffering the pressure caused by the expansion of the cells 1 and improving the situation in which each cell 1 in the electrochemical device 100 expands and is displaced in the first direction F1.

[0154] In some embodiments, in the electrochemical device 100, T1 is the thickness of the elastic member when not compressed by the cells, T2 is the distance in the first direction formed between two adjacent cell groups in the same column, T3 is the thickness of the cells when no charge / discharge cycles are performed, and X is half the total number of cells in the two adjacent cell groups in the same column, where T1, T2, T3, and X satisfy T2-X*T3*20%≦T1≦T2.

[0155] Specifically, X may be an integer. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 is 2 and 2, respectively, the sum of the two is 4, so X = 4 / 2 = 2. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 in the same column is 2 and 4, respectively, the sum of the two is 6, so X = 6 / 2 = 3. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 in the same column is 1 and 1, respectively, the sum of the two is 2, so X = 2 / 2 = 1. Alternatively, X may be a decimal. For example, if the number of cells 1 in two cell groups 10 adjacent to each other in the first direction F1 in the same column is 2 and 3, respectively, the sum of the two is 5, so X = 5 / 2 = 2.5. It is clear that these examples are not intended to limit the scope of the present application. It can be seen that, among the cell groups in the same column, if only one of the numbers of cells 1 in two cell groups 10 adjacent in the first direction F1 is odd, then X is a decimal number, and otherwise X is an integer.

[0156] Specifically, when T1=T2-X*T3*20%, in the initial state of the electrochemical device 100, the elastic member 5 can only contact the cells 1 in the first cell group 10 of the two cell groups 10 (referred to as the first cell group 10 and the second cell group 10, respectively) that are adjacent to each other in the first direction F1 among the cell groups in the same row. Meanwhile, when the cells 1 in the cell group 10 expand to 20% of their initial thickness, the elastic member 5 comes into contact with the cells 1 in the second cell group 10. During the subsequent expansion process, the elastic member 5 is compressed to support the expanded cells 1, preventing excessive expansion of the cells 1 and reducing the risk of the exterior casing of the cells 1 (e.g., made of a metal film) expanding and bursting. It also buffers the pressure caused by the expansion of the cells 1 and improves the situation in which each cell 1 of the electrochemical device 100 expands and displaces overlappingly in the first direction F1, thereby meeting the usage needs of the electrochemical device 100.

[0157] When T1=T2, in the initial state of the electrochemical device 100, the elastic member 5 can simultaneously contact two adjacent cell groups 10 in the first direction F1 among the cell groups in the same row, and when a cell 1 in the cell group 10 expands, the elastic member 5 is compressed to support the expanded cell 1, preventing excessive expansion of the cell 1 and reducing the risk of the exterior casing of the cell 1 (e.g., made of a metal film) expanding and bursting. It also buffers the pressure caused by the expansion of the cell 1 and improves the situation in which each cell 1 of the electrochemical device 100 expands and undergoes overlapping displacement in the first direction F1, thereby meeting the usage needs of the electrochemical device 100.

[0158] Preferably, T1, T2, T3, and X satisfy the relationship T2-X*T3*15%≦T1≦T2-X*T3*0.5%.

[0159] In some embodiments, when T1=T2-X*T3*15%, in the initial state of the electrochemical device 100, one side of the elastic member 5 does not contact the cells 1 in the cell group 10 along the first direction F1. When the cells 1 in the cell group 10 expand to 15% of their initial thickness, the elastic member 5 can simultaneously contact the cells 1 in the cell group 10 on both sides. The elastic member 5 is compressed to support the expanded cells 1, preventing excessive expansion of the cells 1. This better reduces the risk of the exterior packaging of the cells 1 (e.g., made of a metal film) expanding and bursting, buffers the pressure caused by the expansion of the cells 1, and better improves the situation in which each cell 1 of the electrochemical device 100 expands and displaces in the first direction F1, thereby meeting the usage needs of the electrochemical device 100.

[0160] In some embodiments, when T1=T2-X*T3*0.5%, in the initial state of the electrochemical device 100, one side of the elastic member 5 does not contact cell 1 in the cell group 10 along the first direction F1, which meets the needs and can reduce costs compared to when both sides of the elastic member 5 contact cell 1 (i.e., T1=T2), and is more beneficial for heat dissipation of cell 1 compared to when both sides of the elastic member 5 contact cell 1.

[0161] 14 and 24 to 25, in some embodiments, the electrochemical device 100 further includes a housing 4, and the housing 4 includes a first wall surface 401 and a second wall surface 402 that are disposed opposite each other along a first direction F1. An elastic structure such as foam may be disposed between the first wall surface 401 and the M cell groups 10, and an elastic structure such as foam may be disposed between the second wall surface 402 and the M cell groups 10, but this is not limited thereto.

[0162] In some embodiments, the housing 4 includes a third wall surface 403 and a fourth wall surface 404 that are arranged opposite each other along a third direction F3, where the third direction F3 is perpendicular to the first direction F1 and the second direction F2. A fifth protrusion 71 is provided on at least one of the third wall surface 403 and the fourth wall surface 404, and the fifth protrusion 71 is provided between the adjacent first fixing member 21 and second fixing member 22 along the first direction F1, thereby restricting movement of the cell group 10.

[0163] 16 , in some embodiments, at least one first through hole 61 is provided in the first fixing member 21, and the first through hole 61 penetrates the first fixing member 21 along the third direction F3, and / or at least one first through hole 61 is provided in the second fixing member 22, and the first through hole 61 penetrates the second fixing member 22 along the third direction F3, where the third direction F3 is perpendicular to the first direction F1 and the second direction F2. This is advantageous for heat dissipation in the electrode terminal 12 bonded to the first fixing member 21 and / or the second fixing member 22.

[0164] In some embodiments, the third fixing member 23 is provided with at least one first through-hole 61, which penetrates the third fixing member 23 along a third direction F3, where the third direction F3 is perpendicular to the first direction F1 and the second direction F2. This is advantageous for heat dissipation in the electrode terminal 12 bonded to the third fixing member 23.

[0165] 14 and 24, in some preferred embodiments, second through holes 62 are provided in the third wall surface 403 and / or the fourth wall surface 404, and the second through holes 62 communicate with the first through holes 61. In the present application, such a structure can further enhance the heat dissipation effect.

[0166] It is understood that the above are only some preferred embodiments of the electrochemical device 100 provided in the second aspect of the present invention, and are not intended to limit the present invention.

[0167] Referring to Fig. 26, according to a third aspect of the present invention, there is further provided a power consuming device 200. The power consuming device 200 includes the electrochemical device 100 according to any one of the first and second aspects described above.

[0168] The power consuming device 200 according to the embodiment of the present application includes the electrochemical device 100 provided in the embodiment of the present application, which has higher safety, stability and service life than electrochemical devices according to the prior art, and therefore the power consuming device 200 according to the embodiment of the present application has higher safety, stability and service life.

[0169] Referring to the flow chart shown in FIG. 27, the manufacturing flow chart of the first embodiment of the present invention includes the following steps.

[0170] Step S101: The electrode terminals 12 of two adjacent cell groups 10 among the M cell groups 10 are connected by the conductive member 24, and the connection region 25 is formed on the conductive member 24.

[0171] Step S102: A flowable insulating material is applied to the first side 101 of the cell group 10 and the conductive member 24, and the insulating material is hardened to bond the connection region 25 close to the first side 101 of the cell group 10, the portion of the electrode terminal 12 located outside the cell case, and at least a portion of the cell case 11, thereby forming the first fixing member 21.

[0172] Step S103: Apply a flowable insulating material to the second side 102 of the cell group 10 and the conductive member 24, and harden the insulating material to bond the connection region 25 close to the second side 102 of the cell group 10, the portion of the electrode terminal 12 located outside the cell case, and at least a portion of the cell case 11, thereby forming the second fixing member 22.

[0173] In some embodiments, step S102 includes melting the insulating material in an injection molding device and hardening the insulating material to form the first fixing member 21 by an injection molding process.

[0174] In some embodiments, step S102 includes an injection process, which can harden the flowable insulating material to form the first fixing member 21. Preferably, the flowable insulating material includes a sealant.

[0175] In some embodiments, step S103 includes melting the insulating material in an injection molding device and hardening the insulating material to form the second fixing member 22 by an injection molding process.

[0176] In some embodiments, step S103 includes an injection process, which can harden the flowable insulating material to form the second fixing member 22. Preferably, the flowable insulating material includes a sealant.

[0177] Referring to the flow chart shown in FIG. 28, the manufacturing flow chart of the second embodiment of the present invention includes the following steps.

[0178] Step S201: The electrode terminals 12 of two adjacent cell groups 10 among the cell groups 10 in the same row are connected, a flowable insulating material is provided on the first side 101 and the second side 102 of the two adjacent cell groups 10, and the insulating material is hardened to bond the second region 1202 of the electrode terminal 12 and at least a portion of the cell case, thereby forming a third fixing member 23.

[0179] Step S202: A flowable insulating material is applied to the first side 101 of the first cell group 10 among the cell groups 10 in the row, and the insulating material is hardened to bond the portion of the electrode terminal located outside the cell case, at least a part of the cell case, thereby forming a first fixing member 21.

[0180] Step S203: A flowable insulating material is applied to the second side 102 of the last cell group 10 among the cell groups 10 in the row, and the insulating material is hardened to bond the portion of the electrode terminal located outside the cell case and at least a part of the cell case, thereby forming a second fixing member 22.

[0181] In some embodiments, step S201 includes melting an insulating material in an injection molding device and hardening the insulating material to form the third fixing member 23 by an injection molding process.

[0182] In some embodiments, step S201 includes an injection process, which can harden the flowable insulating material to form the third fixing member 23. Preferably, the flowable insulating material includes a sealant.

[0183] In some embodiments, step S202 includes melting the insulating material in an injection molding device and hardening the insulating material to form the first fixing member 21 by an injection molding process.

[0184] In some embodiments, step S202 includes an injection process, which allows the flowable insulating material to harden and form the first fixing member 21. Preferably, the flowable insulating material includes a sealant.

[0185] In some embodiments, step S203 includes melting the insulating material in an injection molding device and hardening the insulating material to form the second fixing member 22 by an injection molding process.

[0186] In some embodiments, step S203 includes an injection process, which can harden the flowable insulating material to form the second fixing member 22. Preferably, the flowable insulating material includes a sealant.

[0187] Referring to the flow chart shown in FIG. 29, the manufacturing flow chart of the second embodiment of the present invention further includes the following steps:

[0188] Step S204: Provide M-1 conductive members, and connect the first side electrode terminal of one of the cell groups in one row of two adjacent rows of cell groups to the second side electrode terminal of one of the cell groups in the other row using the conductive members, and form a connection region 25 on the conductive members.

[0189] Step S205: Apply a flowable insulating material to the first side of the cell group and the conductive member, and harden the insulating material to bond it to the connection region 25 near the first side of the cell group.

[0190] Step S206: Apply a flowable insulating material to the second side of the cell group and the conductive member, and harden the insulating material to bond it to the connection region 25 near the second side of the cell group.

[0191] In some embodiments, step S205 includes melting the insulating material in an injection molding device and curing the insulating material to adhere to the connection area by an injection molding process.

[0192] In some embodiments, step S205 includes an injection process, which allows the flowable insulating material to harden and adhere to the connection area. Preferably, the flowable insulating material includes a sealant.

[0193] In some embodiments, step S206 includes melting the insulating material in an injection molding device and curing the insulating material to adhere to the connection area via an injection molding process.

[0194] In some embodiments, step S206 includes an injection process, which allows the flowable insulating material to harden and adhere to the connection area. Preferably, the flowable insulating material includes an encapsulant.

[0195] As used herein, the term "comprises" and variations thereof are open-ended, meaning "including, but not limited to." The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment," the term "another embodiment" means "at least one other embodiment," and the term "some embodiments" means "at least some embodiments." It should be noted that concepts such as "first," "second," and the like used herein are used only to distinguish between different devices, modules, or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules, or units. The modifiers "one" and "multiple" used herein are exemplary and not limiting. Those skilled in the art will understand "one or more" unless the context clearly dictates otherwise.

[0196] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modifications, uses, or adaptations of the present application. These modifications, uses, or adaptations comply with the general principles of the present application and include common general knowledge or customary technical means in the art that are not disclosed herein. The specification and examples are considered to be exemplary only. The true scope and spirit of the present application are indicated by the appended claims.

[0197] It should be noted that the above embodiments are used to explain the technical means according to the examples of the present application, and are not intended to limit the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art may modify the technical means described in each of the above embodiments or replace some of the technical features with equivalents, and these modifications or replacements do not cause the essence of the corresponding technical means to deviate from the scope of the technical means according to each of the embodiments of the present application.

Claims

1. An electrochemical device comprising: N cells; M first fixing members; M second fixing members; and M-1 conductive members, wherein N and M are both positive integers and 2≦M≦N; The N cells are divided into M cell groups, each cell group including at least one cell, the cells in the cell groups are arranged along a first direction, and the M cell groups are arranged along the first direction; the cell includes a cell case and two electrode terminals, the two electrode terminals being installed opposite each other on both sides of the cell case along a second direction, the second direction being a direction in which the first fixing member and the second fixing member are installed opposite each other, and the second direction being perpendicular to the first direction; Along the first direction, the electrode terminals of two adjacent cell groups are connected by a conductive member, and a connection region is formed on the conductive member; Along the second direction, the cell group includes a first side and a second side that are disposed opposite to each other, the first fixing members are bonded to at least a portion of the electrode terminals of the first side of the cell group, and at least one first fixing member is bonded to at least a portion of the connection region; and / or the second fixing members are bonded to at least a portion of the electrode terminals on the second side of the cell group, and at least one second fixing member is bonded to at least a portion of the connection region; An electrochemical device comprising:

2. At least one cell group includes a plurality of cells, and electrode terminals of the plurality of cells are connected to each other on a first side of the cell group; and / or At least one cell group includes a plurality of cells, and electrode terminals of the plurality of cells are connected to each other on the second side of the cell group.

2. The electrochemical device according to claim 1 .

3. The first fixing member in one of two adjacent cell groups is connected to the second fixing member in the other cell group, and a gap is formed between the first fixing member and the second fixing member in the first direction.

2. The electrochemical device according to claim 1 .

4. A convex portion is provided on one of the first fixing member and the second fixing member along the first direction, and a gap is formed between the first fixing member and the second fixing member by the convex portion.

4. The electrochemical device according to claim 3 .

5. a recess is provided in the other of the first fixing member and the second fixing member along the first direction, the length of the protrusion along the first direction is longer than the length of the recess along the first direction, and a gap is formed between the first fixing member and the second fixing member by engagement between the protrusion and the recess; 5. The electrochemical device according to claim 4.

6. The cell further includes an electrode assembly, the electrode assembly is installed in the cell case, and the two electrode terminals are connected to the electrode assembly and extend from the cell case; In the same group of cells, a projection of the first fixing member is spaced apart from a projection of an electrode assembly of a cell in the group of cells along the first direction; and / or In the same group of cells, a projection of the second fixing member is spaced apart from a projection of an electrode assembly of a cell in the group of cells along the first direction.

2. The electrochemical device according to claim 1 .

7. at least one first fixing member is molded onto the first side of the cell group and at least a portion of the connection region by an injection molding process; and / or the at least one second fixing member is molded onto the second side of the cell group and at least a portion of the connection region by an injection molding process.

2. The electrochemical device according to claim 1 .

8. the first fixing member covers a portion of the electrode terminal located outside the cell case and at least a part of the cell case; and / or the second fixing member covers a portion of the electrode terminal located outside the cell case and at least a part of the cell case.

8. The electrochemical device according to claim 7.

9. At least one first through hole is provided in the first fixing member, and the first through hole penetrates the first fixing member along a third direction; and / or At least one first through hole is provided in the second fixing member, the first through hole penetrates the second fixing member along a third direction, and the third direction is perpendicular to the first direction and the second direction.

2. The electrochemical device according to claim 1 .

10. the electrochemical device further includes a housing, the housing including a third wall surface and a fourth wall surface disposed opposite each other along the third direction; a second through hole is provided in the third wall surface and / or the fourth wall surface, and the second through hole is in communication with the first through hole; 10. The electrochemical device according to claim 9.

11. An electrochemical device comprising: N cells; A first fixing members; A second fixing members; and (L-1)*A third fixing members, wherein N, M, and L are all positive integers, and 2≦M≦N, L≧2; The N cells are divided into M cell groups, and the M cell groups are divided into A rows and L columns, and along a second direction, the cell groups include first and second sides that are oppositely disposed; Each of the cell groups includes at least one cell, the cells in the cell groups are arranged along a first direction, and the second direction is perpendicular to the first direction; The cell includes a cell case and two electrode terminals, the two electrode terminals being disposed opposite each other on both sides of the cell case along the second direction, In one row of cell groups, the first fixing member is located on a first side of a first cell group among the cell groups in the row and is bonded to at least a part of the electrode terminals on the first side of the first cell group, and the second fixing member is located on a second side of a last cell group among the cell groups in the row and is bonded to at least a part of the electrode terminals on the second side of the last cell group, In one row of cell groups, electrode terminals of two adjacent cell groups are connected, the third fixing member is connected to each of the two adjacent cell groups, the third fixing member is bonded to at least a part of the electrode terminals on the second side of one of the two adjacent cell groups, and the third fixing member is bonded to at least a part of the electrode terminals on the first side of the other of the two adjacent cell groups. An electrochemical device comprising:

12. The cell group in row A is stacked in order along the first direction, the electrochemical device further includes A-1 conductive members; Among two adjacent rows of cell groups, a first-side electrode terminal of a first cell group in one row is connected to a second-side electrode terminal of a first cell group in the other row of cell groups by the conductive member, and a connection area is formed on the conductive member, and at least one of the first fixing members is adhered to at least a part of the connection area, and / or at least one of the second fixing members is adhered to at least a part of the connection area.

12. The electrochemical device according to claim 11 .

13. at least one first fixing member is molded onto a first side of a first one of the cells in the row and at least a portion of the connection region by an injection molding process; and / or at least one second fixing member is molded onto the second side of the last one of the cells in the row and at least a portion of the connection region by an injection molding process; and / or In two adjacent cell groups in one row of cell groups, at least one third fixing member is molded on the second side of one cell group and on the first side of the other cell group by an injection molding process.

13. The electrochemical device according to claim 12.

14. the first fixing member covers a portion of the electrode terminal located outside the cell case and at least a part of the cell case; and / or the second fixing member covers a portion of the electrode terminal located outside the cell case and at least a part of the cell case; and / or the third fixing member covers a portion of the electrode terminal located outside the cell case and at least a part of the cell case.

14. The electrochemical device according to claim 13.

15. At least one first through hole is provided in the first fixing member, and the first through hole penetrates the first fixing member along a third direction; and / or At least one first through hole is provided in the second fixing member, and the first through hole penetrates the second fixing member along a third direction; and / or At least one first through hole is provided in the third fixing member, and the first through hole penetrates the third fixing member along a third direction; the third direction is perpendicular to the first direction and the second direction; The electrochemical device according to any one of claims 11 to 13, characterized in that

16. Along the first direction, of two adjacent cell groups, the first fixing member in one of the cell groups is connected to the second fixing member in the other of the cell groups, and a gap is formed between the first fixing member and the second fixing member in the first direction; and / or the third fixing member in one of two adjacent cell groups along the first direction is connected to the third fixing member in the other cell group, and a gap is formed between the two third fixing members in the first direction; 16. The electrochemical device according to claim 15.

17. The cell further includes an electrode assembly, the electrode assembly is installed in the cell case, and the two electrode terminals are connected to the electrode assembly and extend from the cell case; In the same group of cells, a projection of the first fixing member is spaced apart from a projection of an electrode assembly of a cell in the group of cells along the first direction; and / or In the same group of cells, a projection of the second fixing member is spaced apart from a projection of an electrode assembly of a cell in the group of cells along the first direction; and / or In the cell groups in the same row, a projection of the third fixing member between two adjacent cell groups along the first direction is spaced apart from a projection of an electrode assembly of a cell in the two cell groups.

16. The electrochemical device according to claim 15.

18. the electrochemical device further includes a housing, the housing including a third wall surface and a fourth wall surface disposed opposite each other along a third direction; a second through hole is provided in the third wall surface and / or the fourth wall surface, and the second through hole is in communication with the first through hole; 16. The electrochemical device according to claim 15.

19. An electric power consuming device comprising the electrochemical device according to any one of claims 1 to 18.

1. A power consuming device comprising:

20. A method for manufacturing an electrochemical device according to any one of claims 1 to 10, comprising: Step S101: connecting electrode terminals of two adjacent cell groups among the M cell groups by a conductive member and forming a connection region on the conductive member; Step S102: applying a flowable insulating material to the first side of the cell group and the conductive member, and hardening the insulating material to bond a connection region close to the first side of the cell group, a portion of the electrode terminal located outside the cell case, and at least a part of the cell case, thereby forming a first fixing member; and step S103 of applying a flowable insulating material to the second side of the cell group and the conductive member, and hardening the insulating material to bond the connection region close to the second side of the cell group, the portion of the electrode terminal located outside the cell case, and at least a part of the cell case, thereby forming a second fixing member. A method for manufacturing an electrochemical device, comprising:

21. A method for manufacturing an electrochemical device according to any one of claims 11 to 18, comprising: Step S201: connecting electrode terminals of two adjacent cell groups among the cell groups in the same row, providing a flowable insulating material on a first side and a second side of the two adjacent cell groups, and hardening the insulating material to bond portions of the electrode terminals located outside the cell casings and at least a portion of the cell casings, thereby forming a third fixing member; Step S202: applying a flowable insulating material to a first side of a first cell group of the cell groups in the row, and hardening the insulating material to bond a portion of the electrode terminal located outside the cell case and at least a portion of the cell case, thereby forming a first fixing member; and step S203 of applying a flowable insulating material to a second side of the last cell group of the cell groups in the row, and hardening the insulating material to bond the portions of the electrode terminals located outside the cell casings and at least a part of the cell casings to form a second fixing member. A method for manufacturing an electrochemical device, comprising:

22. Step S204: providing M-1 conductive members, connecting electrode terminals on a first side of a first cell group in one row of cell groups in two adjacent rows to electrode terminals on a second side of a first cell group in the other row of cell groups, and forming connection regions on the conductive members; Step S205: applying a flowable insulating material to the first side of the cells and the conductive member, and curing the insulating material to bond the connection area proximate the first side of the cells; and step S206: applying a flowable insulating material to the second side of the cells and the conductive member, and curing the insulating material to bond the connection area near the second side of the cells.

22. The method for manufacturing an electrochemical device according to claim 21.

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