Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises a mounting rack, a battery cell assembly and a connecting assembly, the battery cell assembly comprises two battery cell groups distributed in the mounting rack along a first direction, each battery cell group comprises a plurality of battery cell units sequentially distributed along a second direction, and each battery cell unit comprises two battery cells sequentially distributed along the second direction; each battery cell comprises a first pole and a second pole which are distributed along a first direction, and the first poles of two adjacent battery cells distributed along the first direction are close to each other; the first pole columns of the two adjacent battery cells distributed along the first direction are connected through the first connecting piece of the connecting assembly, and the second pole columns of the two battery cells of the battery cell unit are connected through the second connecting piece of the connecting assembly. According to the embodiment of the invention, the first pole columns of the two adjacent battery cells distributed along the first direction are connected through the first connecting piece, so that the first connecting piece and the two first pole columns connected with the first connecting piece synchronously displace, and the problem that the pole columns of the battery cells are damaged due to large displacement can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery module and a battery pack. Background Art

[0002] In the related art, multiple rows of battery cells are installed in a mounting rack. During the charging and discharging process of the battery cells, a large expansion force will be generated in their arrangement direction. This expansion force acts on the end plates on both sides of the mounting rack along the arrangement direction of the battery cells, squeezing the end plates on both sides of the mounting rack to cause bending deformation, resulting in displacement of the battery cells in their arrangement direction. Among them, since the anti-deformation ability of the middle parts of the end plates on both sides of the mounting rack is weak, therefore, the middle parts of the end plates on both sides of the mounting rack will generate greater bending deformation under the action of the expansion force, causing a large displacement of the pole columns corresponding to the middle positions of the end plates on both sides of the mounting rack for the battery cells, and further causing the pole columns to be subjected to a large shear force or torque, and it is easy to damage the pole columns of the battery cells. Summary of the Utility Model

[0003] Embodiments of the present application provide a battery module and a battery pack, which can improve the technical problem that after the battery cells of the battery module expand and deform, the pole columns of the battery cells are subjected to a large shear force or torque due to large displacement, and thus the pole columns are damaged.

[0004] In a first aspect, embodiments of the present application provide a battery module, including:

[0005] A mounting rack;

[0006] A battery cell assembly, including two battery cell groups distributed in the mounting rack along a first direction. Each battery cell group includes a plurality of battery cell units distributed in sequence along a second direction. Each battery cell unit includes two battery cells distributed in sequence along the second direction. Each battery cell includes a first pole column and a second pole column distributed along the first direction. The first pole columns of two adjacent battery cells distributed along the first direction are close to each other, and the first direction and the second direction form an angle;

[0007] A connection assembly, including a plurality of first connection members and a plurality of second connection members. The first pole columns of two adjacent battery cells distributed along the first direction are connected by the first connection members, and the second pole columns of the two battery cells of each battery cell unit are connected by the second connection members.

[0008] In an embodiment, the polarities of the first pole columns of two adjacent battery cells distributed along the first direction are opposite; the polarities of the second pole columns of the two battery cells of each battery cell unit are opposite.

[0009] In one embodiment, one of the battery cell groups further includes two independent battery cells, and the two independent battery cells are located on both sides of the plurality of battery cell units along the second direction; or,

[0010] The two battery cell groups each further include an independent battery cell, wherein the independent battery cell of one battery cell group is located on one side of the multiple battery cell units along the second direction, and the independent battery cell of the other battery cell group is located on the other side of the multiple battery cell units along the second direction.

[0011] In one embodiment, the battery module further includes a collection circuit extending along the second direction, and the plurality of first connectors and the plurality of second connectors are electrically connected to the collection circuit respectively.

[0012] In one embodiment, the acquisition circuit includes two acquisition wire bundles extending along the second direction, the two acquisition wire bundles are distributed on both sides of the first connector along the first direction, and the acquisition wire bundles are electrically connected to the second connectors and part of the first connectors located on both sides thereof along the first direction.

[0013] In one embodiment, the battery module also includes an insulating plate covering the battery cell assembly, the connecting assembly and the acquisition circuit are arranged on a side of the insulating plate away from the battery cell assembly, and the insulating plate is provided with a plurality of connecting holes, and the connecting holes are used for electrically connecting the first connecting member to the first pole, or the connecting holes are used for electrically connecting the second connecting member to the second pole.

[0014] In one embodiment, the mounting frame includes two end plates arranged opposite to each other along the second direction, and two side plates arranged opposite to each other along the first direction, and two ends of the end plates are connected to ends of the two side plates in a one-to-one correspondence to enclose and form a cavity;

[0015] The mounting frame further comprises a connecting plate extending along the second direction, and the two ends of the connecting plate along the second direction are respectively connected to the two end plates to divide the cavity into two sub-cavities; the battery cell groups are arranged in the two sub-cavities in a one-to-one correspondence.

[0016] In one embodiment, an adhesive layer is provided on a side of the connecting plate facing the sub-cavity, and the adhesive layer is bonded to a side of the battery cell.

[0017] In one embodiment, the connecting plate is connected to the end plate by welding.

[0018] In one embodiment, the end plate is provided with a through hole, the through hole penetrates the end plate along the second direction, and the end of the connecting plate along the second direction passes through the through hole and extends out of a side of the end plate away from the cavity.

[0019] In a second aspect, an embodiment of the present application provides a battery pack, which includes:

[0020] A housing;

[0021] A battery module, which is the battery module as described above. The battery module is disposed within the housing. The battery module includes a mounting rack, a battery cell assembly, and a connection assembly. The battery cell assembly includes two battery cell groups distributed along a first direction within the mounting rack. Each battery cell group includes a plurality of battery cell units distributed in sequence along a second direction. Each battery cell unit includes two battery cells distributed in sequence along the second direction. Each battery cell includes a first pole column and a second pole column distributed along the first direction. The first pole columns of two adjacent battery cells distributed along the first direction are close to each other. The first direction and the second direction form an angle. The connection assembly includes a plurality of first connection members and a plurality of second connection members. The first pole columns of two adjacent battery cells distributed along the first direction are connected by the first connection members. The second pole columns of the two battery cells of each battery cell unit are connected by the second connection members.

[0022] Advantageous effects of the embodiment of the present application:

[0023] In the embodiment of the present application, the first pole columns of two adjacent battery cells distributed along the first direction in the battery module are connected by the first connection members, and the second pole columns of the two battery cells of each battery cell unit are connected by the second connection members. The plurality of battery cells of the battery cell assembly can be connected in series or in parallel through the plurality of first connection members and second connection members of the connection assembly. Moreover, since the expansion displacement amounts of the first pole columns of two adjacent battery cells distributed along the first direction in the second direction are substantially the same, after the first pole columns of two adjacent battery cells distributed along the first direction are connected by the first connection members, the first pole columns of two adjacent battery cells distributed along the first direction can drive the first connection members connected thereto to displace synchronously, so that the distance between the two first pole columns connected by the first connection members remains substantially unchanged, and the acting forces between the first connection members and the two first pole columns also remain substantially unchanged. Therefore, it is possible to avoid the problem that after the battery cells expand and cause the first pole columns to displace, the first pole columns are subjected to a large shear force or torsion force, resulting in damage to the first pole columns.

[0024] In the battery pack provided by the embodiment of the present application, the first pole columns of two adjacent battery cells distributed in the first direction of the battery module are connected by a first connecting member, and the second pole columns of the two battery cells of the battery cell unit are connected by a second connecting member. When the battery cells expand, the first pole columns of two adjacent battery cells distributed in the first direction can drive the first connecting member connected thereto to displace synchronously, so that the distance between the two first pole columns connected by the first connecting member remains basically unchanged, and the acting force between the first connecting member and the two first pole columns also remains basically unchanged. Therefore, it is possible to avoid the problem that after the first pole column is displaced due to the expansion of the battery cell, the first pole column is subjected to a large shear force or torsion, resulting in damage to the first pole column, and the stability of the battery pack is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is an exploded structural schematic diagram of an embodiment of a battery module provided by an embodiment of the present application;

[0027] Figure 2 is a cooperative structural schematic diagram of an embodiment of a battery cell assembly, a connection assembly, and a collection circuit provided by an embodiment of the present application;

[0028] Figure 3 is a cooperative structural schematic diagram of a mounting rack, a battery cell assembly, a connection assembly, and a collection circuit provided by an embodiment of the present application;

[0029] Figure 4 is an exploded structural schematic diagram of an embodiment of a mounting rack provided by an embodiment of the present application.

[0030] Battery module 100; Mounting rack 110; End plate 111; Through hole 1111; Side plate 112; Connecting plate 113; Adhesive layer 114; Cavity 115; Sub-cavity 1151; Battery cell assembly 120; Battery cell group 121; Battery cell unit 1210; Battery cell 1211; First pole column 1212; Second pole column 1213; Connection assembly 130; First connecting member 131; Second connecting member 132; Collection circuit 140; Collection wire harness 141; Insulating plate 150; First mounting groove 151; Second mounting groove 152; First connection hole 153; Second connection hole 154; First direction X; Second direction Y. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation terms such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0032] Multiple battery cells of the battery module are installed in the mounting rack. During the charging and discharging process, the battery cells will expand and deform. When the battery cells expand, a large expansion force will be generated in the arrangement direction of the multiple battery cells. This expansion force acts on both sides of the mounting rack along the arrangement direction of the battery cells, squeezing the two sides of the mounting rack to cause bending deformation, resulting in displacement of the battery cells in their arrangement direction. Correspondingly, the pole columns on the battery cells will also generate displacement.

[0033] Among them, the two end portions of the mounting rack along the arrangement direction of the battery cells are connected to other structures of the mounting rack. Therefore, the other structures of the mounting rack will apply a tensile force to the two end portions of the mounting rack, restricting the bending deformation amount of the two end portions of the mounting rack, resulting in stronger anti-deformation ability of the two end portions of the mounting rack, while the anti-deformation ability of the middle portions of the two sides of the mounting rack is weaker. When the two sides of the mounting rack are squeezed by the expansion force of the battery cells, the middle portions of the two sides of the mounting rack will produce greater bending deformation compared with the end portions, causing a greater displacement at the positions of the battery cells corresponding to the middle portions of the two sides of the mounting rack compared with the positions of the battery cells corresponding to the two end portions of the mounting rack.

[0034] Especially when the battery module includes two rows of battery cells arranged in parallel, the position between the two rows of battery cells arranged in parallel corresponds to the middle portions of the two sides of the mounting rack. Therefore, when the battery cells expand, the end portions of the two rows of battery cells close to each other will produce a large displacement in the arrangement direction of the battery cells. Moreover, the closer to the two sides of the mounting rack, the greater the displacement generated at one end of the battery cell corresponding to the middle portion of the two sides of the mounting rack. Correspondingly, the displacement of the pole column at one end of the battery cell corresponding to the middle portion of the two sides of the mounting rack is also greater. In the arrangement direction of the battery cells, the distance between the pole columns at one end of adjacent two battery cells corresponding to the middle portions of the two sides of the mounting rack will also increase.

[0035] Taking the mounting rack formed by end plates and side plates in the related art as an example: The mounting rack includes two end plates oppositely arranged along the arrangement direction of a plurality of battery cells, and two side plates extending along the arrangement direction of the plurality of battery cells. The two ends of the two end plates are respectively connected through the side plates in one-to-one correspondence, and enclose to form a cavity for mounting the plurality of battery cells. When the battery cells expand and exert an expansion force on the end plates, since the ends of the end plates will be subjected to the pulling force of the side plates, while the middle parts of the end plates are not subjected to the pulling force of the side plates, therefore, the middle parts of the end plates will generate a greater bending deformation compared to the ends of the end plates, resulting in a greater displacement at the positions corresponding to the middle parts of the end plates and the battery cells.

[0036] In the related art, in the arrangement direction of the battery cells, the pole columns at one end corresponding to the middle parts on both sides of the mounting rack between two adjacent battery cells are connected through a connecting piece. When the distance between the two pole columns connected to the connecting piece increases, the connecting piece will exert a large shearing force or torque on the pole columns, and the situation of damage to the pole columns of the battery cells is likely to occur.

[0037] To avoid the above problems, an embodiment of the present application provides a battery module.

[0038] Figure 1 It is a schematic exploded view of an embodiment of the battery module provided by the embodiment of the present application. As Figure 1 shown, the battery module 100 includes a mounting rack 110, a battery cell assembly 120, and a connection assembly 130. The battery cell assembly 120 includes a plurality of battery cells 1211 disposed in the mounting rack 110. The battery cell 1211 includes a first pole column 1212 and a second pole column 1213. The connection assembly 130 is used for electrically connecting to the first pole columns 1212 and the second pole columns 1213 of the plurality of battery cells 1211 of the battery cell assembly 120 to achieve series or parallel connection between the plurality of battery cells 1211 of the battery cell assembly 120.

[0039] As Figures 1 to 3 shown, the battery cell assembly 120 includes two battery cell groups 121 distributed in the mounting rack 110 along the first direction X. The battery cell group 121 includes a plurality of battery cell units 1210 sequentially distributed along the second direction Y. The battery cell unit 1210 includes two battery cells 1211 sequentially distributed along the second direction Y. The first direction X and the second direction Y form an angle. That is, the battery module 100 includes two rows of battery cells 1211 disposed in the mounting rack 110. The two rows of battery cells 1211 are distributed along the first direction X, and each row of battery cells 1211 is sequentially arranged along the second direction Y. Among them, the first direction X and the second direction Y can be perpendicular, or the angle formed by the intersection of the first direction X and the second direction Y can be an acute angle.

[0040] It should be noted that in addition to the battery cell units 1210, the battery cell group 121 may further include one or more individual battery cells 1211, and the one or more individual battery cells 1211 and the multiple battery cell units 1210 are distributed along the second direction Y. In addition, the battery cell assembly 120 may also include three, four or more battery cell groups 121, and the multiple battery cell groups 121 are sequentially distributed in the mounting frame 110 along the first direction X.

[0041] Among them, the battery cell 1211 includes a first pole 1212 and a second pole 1213 distributed along the first direction X. Thus, the thickness direction of the battery cell 1211 is parallel to the second direction Y. When multiple battery cells 1211 expand, the multiple battery cells 1211 mainly generate displacement along the second direction Y, thereby driving the first pole 1212 and the second pole 1213 of the battery cell 1211 to generate displacement along the second direction Y.

[0042] It should be noted that the polarities of the first pole 1212 and the second pole 1213 are opposite. The first pole 1212 can be the positive pole, and the second pole 1213 can be the negative pole; or, the first pole 1212 can be the negative pole, and the second pole 1213 can be the positive pole, which can be specifically determined according to the wiring method of the multiple battery cells 1211 of the battery module 100.

[0043] Continue to refer to Figures 1 to 3 , the first poles 1212 of two adjacent battery cells 1211 distributed along the first direction X are close to each other. And the second poles 1213 of two adjacent battery cells 1211 distributed along the first direction X are far from each other.

[0044] Among them, the first pole 1212 of the battery cell 1211 corresponds to the middle parts on both sides of the mounting frame 110, and the second pole 1213 of the battery cell 1211 corresponds to the end parts on both sides of the mounting frame 110. After the battery cell 1211 expands, the displacements generated by the first poles 1212 of two adjacent battery cells 1211 distributed along the first direction X are equal, and the displacement generated by the battery cell 1211 in the second direction Y is greater than the displacement generated by the second pole 1213 in the second direction Y. At the same time, the displacement generated by the first pole 1212 of the battery cell 1211 closer to both sides of the mounting frame 110 in the second direction Y is greater, resulting in an increase in the distance between the first poles 1212 of two adjacent battery cells 1211 along the second direction Y.

[0045] If the first poles 1212 of two adjacent battery cells 1211 along the second direction Y are connected by a connecting piece, there will be a situation where the first poles 1212 of two adjacent battery cells 1211 along the second direction Y are subjected to a large shearing force or torsion force, thereby resulting in the problem of damage to the first pole 1212 of the battery cell 1211.

[0046] To avoid the above problems, in some embodiments, the connection component 130 includes a plurality of first connection members 131 and a plurality of second connection members 132. The first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X are connected by the first connection members 131, and the second pole columns 1213 of the two battery cells 1211 of the battery cell unit 1210 are connected by the second connection members 132.

[0047] Thus, a plurality of battery cells 1211 of the battery cell assembly 120 can be connected in series or in parallel through the plurality of first connection members 131 and the second connection members 132 of the connection component 130. Moreover, since the expansion displacement amounts of the first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X in the second direction Y are basically the same, after the first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X are connected by the first connection members 131, the first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X can drive the first connection members 131 connected thereto to displace synchronously. That is, when the battery cell 1211 expands, the distance between the two first pole columns 1212 connected to the first connection member 131 basically remains unchanged, and the acting forces between the first connection member 121 and the two first pole columns 1212 also basically remain unchanged. Therefore, it is possible to avoid the problem that after the expansion of the battery cell 1211 causes the displacement of the first pole column 1212, the first pole column 1212 is subjected to a large shearing force or torsion force, resulting in damage to the first pole column 1212.

[0048] Among them, the plurality of first connection members 131 of the connection component 130 are arranged in a row along the second direction Y. The number of the plurality of first connection members 131 is equal to the number of the battery cells 1211 included in the battery cell group 121. A part of the plurality of first connection members 131 is electrically connected to the first pole columns 1212 of the plurality of battery cells 1211 of one battery cell group 121 in one-to-one correspondence, and another part of the plurality of first connection members 131 is electrically connected to the first pole columns 1212 of the plurality of battery cells 1211 of another battery cell group 121 in one-to-one correspondence, so as to realize the connection of the first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X through the first connection members 131.

[0049] In some embodiments, the polarities of the first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X can be opposite. Thus, two adjacent battery cells 1211 distributed along the first direction X can be connected in series through the first connection member 131. Among them, one of the two first pole columns 1212 connected to the first connection member 131 is a positive pole column, and the other first pole column 1212 is a negative pole column, so as to connect two battery cells 1211 distributed along the first direction X in series through the first connection member 131.

[0050] Similarly, the polarities of the second pole columns 1213 of the two battery cells 1211 of the battery cell unit 1210 can be made opposite. Thus, the two battery cells of the battery cell unit 1210 are connected in series through the second connecting member 132. Among them, one of the two second pole columns 1213 connected to the second connecting member 132 is the positive pole column, and the other second pole column 1213 is the negative pole column, so that the second pole columns 1213 of the two battery cells 1211 of the battery cell unit 1210 are connected in series through the second connecting member 132.

[0051] In some preferred embodiments, the polarities of the first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X can be made opposite, and the polarities of the second pole columns 1213 of the two battery cells 1211 of the battery cell unit 1210 can be made opposite. Moreover, the first pole columns 1212 of two adjacent battery cells 1211 of one battery cell unit 1210 of one battery cell group 121 and the first pole columns 1212 of the two battery cells 1211 of one battery cell unit 1210 of another battery cell group 121 are connected in one-to-one correspondence through two first connecting members 131, so as to realize that a plurality of first connecting members 131 and a plurality of second connecting members 132 connect a plurality of battery cells 1211 of two battery cell groups 121 in series in sequence along Figure 3 the dotted line direction in.

[0052] As Figures 1 to 3 shown, the battery module 100 further includes a collection circuit 140 extending along the second direction Y, and a plurality of first connecting members 131 and a plurality of second connecting members 132 are respectively electrically connected to the collection circuit 140. Thus, the voltage signals of the pole columns 1212 of each battery cell 1211 can be collected through the collection circuit 140.

[0053] In some embodiments, the collection circuit 140 includes two collection wire harnesses 141 extending along the second direction Y. The two collection wire harnesses 141 are distributed on both sides of the first connecting member 131 along the first direction X, and the collection wire harness 141 is electrically connected to the second connecting member 132 and a part of the first connecting members 131 located on both sides of it along the first direction X.

[0054] Among them, a part of the first connecting members 131 among the plurality of first connecting members 131 is electrically connected to one collection wire harness 141, and another part of the first connecting members 131 among the plurality of first connecting members 131 is electrically connected to the other collection wire harness 141, so that each first connecting member 131 is electrically connected to the collection circuit 140.

[0055] Specifically, the first connectors 131 spaced apart from the plurality of first connectors 131 can be electrically connected to one of the collection harnesses 141, while the other first connectors 131 from the plurality of first connectors 131 are electrically connected to another collection harness 141. Of course, the adjacent first connectors 131 from the plurality of first connectors 131 can also be electrically connected to one of the collection harnesses 141, while the other part of the first connectors 131 from the plurality of first connectors 131 are electrically connected to another collection harness 141.

[0056] like Figure 1 As shown, the battery module 100 further includes an insulating plate 150 covering the battery cell assembly 120, and the connecting assembly 130 and the collecting circuit 140 are arranged on the side of the insulating plate 150 away from the battery cell assembly 120, so as to separate the battery cell 1211 of the battery cell assembly 120 from the connecting assembly 130 and the collecting circuit 140, and prevent the connecting assembly 130 or the collecting circuit 140 from short-circuiting the battery cell 1211 of the battery cell assembly 120. Among them, the insulating plate 150 is provided with a first connecting hole 153 and a second connecting hole 154, the first connecting hole 153 is used for connecting the first connecting member 131 with the first pole 1212, and the second connecting hole 154 is used for electrically connecting the second connecting member 132 with the second pole 1213.

[0057] Specifically, the first connector 131 and the second connector 132 are arranged in a plate or sheet shape. A first mounting groove 151 for mounting the first connector 131 is provided on the side of the insulating plate 150 away from the battery cell assembly 120, and a first connection hole 153 is provided at the bottom of the first mounting groove 151. The first connector 131 is installed in the first mounting groove 151 and is electrically connected to the first pole 1212 of the battery cell 1211 through the first connection hole 153 at the bottom of the first mounting groove 151. A second mounting groove 152 for mounting the second connector 132 is provided on the side of the insulating plate 150 away from the battery cell assembly 120, and a second connection hole 154 is provided at the bottom of the second mounting groove 152. The second connector 132 is installed in the second mounting groove 152 and is electrically connected to the second pole 1213 of the battery cell 1211 through the second connection hole 154 at the bottom of the second mounting groove 152. The first connector 131 and the second connector 132 can be fixedly connected to the pole 1212 of the battery cell 1211 by welding.

[0058] like Figure 1 As shown, the mounting frame 110 includes two end plates 111 disposed opposite to each other along the second direction Y, and two side plates 112 disposed opposite to each other along the first direction X. The two ends of the end plates 111 are connected to the ends of the two side plates 112 in a one-to-one correspondence, and enclose a cavity 115. The battery cell assembly 120 is disposed in the cavity 115 of the mounting frame 110.

[0059] In some embodiments,Figure 1 and Figure 4 As shown in Figure 4 , the mounting bracket 110 further includes a connecting plate 113 extending along the second direction Y. Both ends of the connecting plate 113 along the second direction Y are respectively connected to the two end plates 111, so as to divide the cavity 115 into two sub-cavities 1151. The battery cell groups 121 are respectively disposed in the two sub-cavities 1151 one by one.

[0060] It can be understood that by connecting both ends of the connecting plate 113 along the second direction Y to the two end plates 111 respectively and dividing the cavity 115 into two sub-cavities 1151 for accommodating the battery cell groups 121, the connecting plate 113 can apply a tensile force to the middle part of the two end plates 111. When multiple battery cells 1211 of the battery cell group 121 expand and cause the middle part of the end plate 111 to displace in the second direction Y, the connecting plate 113 can apply a tensile force to the middle part of the end plate 111 to limit the deformation amount of the middle part of the end plate 111, and further limit the displacement amount of the first pole columns 1212 of two adjacent battery cells 1211 distributed along the first direction X along with the displacement of the battery cells 1211 in the second direction Y, thereby further reducing the large shear force and torque suffered by the first pole columns 1212 of the battery cells 1211 due to displacement.

[0061] In some embodiments, as Figure 1 and Figure 4 shown in Figure 4 , an adhesive layer 114 is provided on the side of the connecting plate 113 facing the sub-cavity 1151, and the adhesive layer 114 is bonded to the side of the battery cell 1211. Thus, when multiple battery cells 1211 of the battery cell group 121 expand, the connecting plate 113 can apply a tensile force to prevent the displacement of the battery cells 1211 through the adhesive layer, thereby reducing the displacement amount of the first pole columns 1212 of the battery cells 1211 in the second direction Y to a certain extent.

[0062] Specifically, adhesive layers 114 are provided on the sides of the connecting plate 113 facing the two sub-cavities 1151, so that both sides of the connecting plate 113 are bonded to the sides of multiple battery cells 1211 of the corresponding battery cell group 121 through the adhesive layers 114.

[0063] In some embodiments, the connecting plate 113 can be welded to the end plate 111, so as to increase the connection stability between the end of the connecting plate 113 and the end plate 111, enable the connecting plate 113 to apply a greater tensile force to the middle part of the end plate 111, and further improve the limiting effect on the deformation amount of the middle part of the end plate 111.

[0064] Specifically, as Figure 1 and Figure 4As shown, the end plate 111 is provided with a through hole 1111, which penetrates the end plate 111 along the second direction Y, and the end of the connecting plate 113 along the second direction Y passes through the through hole 1111 and extends out of the side of the end plate 111 away from the cavity 115. Therefore, the end plate 111 and the connecting plate 113 can be welded together from the side of the end plate 111 away from the cavity 115, which is more convenient to operate. Of course, the connecting plate 113 and the end plate 111 can also be connected together by screw connection, clamping or other methods, as long as the connecting plate 113 can apply tension to the end plate 111 to reduce the deformation of the middle part of the end plate 111.

[0065] An embodiment of the present application also provides a battery pack, which includes a battery module. The specific structure of the battery module refers to the above embodiment. Since the battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0066] The battery pack may include a shell and a battery module. The battery module may be the battery module in any of the above embodiments. The battery module is disposed in the shell.

[0067] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery module, characterized in that: include: Mounting frame; A battery cell assembly, comprising two battery cell groups distributed in the mounting frame along a first direction, the battery cell groups comprising a plurality of battery cell units sequentially distributed along a second direction, the battery cell units comprising two battery cells sequentially distributed along the second direction, the battery cells comprising a first pole and a second pole distributed along the first direction, the first poles of two adjacent battery cells distributed along the first direction being close to each other, and the first direction and the second direction forming an angle; The connecting component includes a plurality of first connecting members and a plurality of second connecting members, wherein the first poles of two adjacent battery cells distributed along the first direction are connected via the first connecting members, and the second poles of two battery cells of the battery cell unit are connected via the second connecting members.

2. The battery module according to claim 1, characterized in that: The polarities of the first poles of two adjacent battery cells distributed along the first direction are opposite; the polarities of the second poles of two battery cells in the battery cell unit are opposite.

3. The battery module according to claim 2, characterized in that: One of the battery cell groups further includes two independent battery cells, and the two independent battery cells are located on both sides of the plurality of battery cell units along the second direction; or, The two battery cell groups each further include an independent battery cell, wherein the independent battery cell of one battery cell group is located on one side of the multiple battery cell units along the second direction, and the independent battery cell of the other battery cell group is located on the other side of the multiple battery cell units along the second direction.

4. The battery module according to claim 1, characterized in that: The battery module further includes a collection circuit extending along the second direction, and the plurality of first connectors and the plurality of second connectors are electrically connected to the collection circuit respectively.

5. The battery module according to claim 4, characterized in that: The acquisition circuit includes two acquisition wire bundles extending along the second direction, the two acquisition wire bundles are distributed on both sides of the first connector along the first direction, and the acquisition wire bundles are electrically connected to the second connectors and part of the first connectors located on both sides thereof along the first direction.

6. The battery module according to claim 5, characterized in that: The battery module also includes an insulating plate covering the battery cell assembly. The connecting assembly and the acquisition circuit are arranged on a side of the insulating plate away from the battery cell assembly. The insulating plate is provided with a plurality of connecting holes. Some of the connecting holes are used for electrically connecting the first connecting member to the first pole, or the connecting holes are used for electrically connecting the second connecting member to the second pole.

7. The battery module according to any one of claims 1 to 6, characterized in that: The mounting frame includes two end plates arranged opposite to each other along the second direction, and two side plates arranged opposite to each other along the first direction, and two ends of the end plates are connected to ends of the two side plates in a one-to-one correspondence to enclose and form a cavity; The mounting frame further comprises a connecting plate extending along the second direction, and the two ends of the connecting plate along the second direction are respectively connected to the two end plates to divide the cavity into two sub-cavities; the battery cell groups are arranged in the two sub-cavities in a one-to-one correspondence.

8. The battery module according to claim 7, characterized in that: The side of the connecting plate facing the sub-cavity is provided with an adhesive layer, and the adhesive layer is bonded to the side of the battery core.

9. The battery module according to claim 7, characterized in that: The connecting plate is connected to the end plate by welding.

10. The battery module according to claim 9, characterized in that: The end plate is provided with a through hole, and the through hole penetrates the end plate along the second direction. The end of the connecting plate along the second direction passes through the through hole and extends out from a side of the end plate away from the cavity.

11. A battery pack, characterized in that: The battery pack comprises: shell; A battery module, wherein the battery module is the battery module according to any one of claims 1 to 10, and the battery module is arranged in the shell.

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