Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, the battery pack comprises battery monomers and an electric connecting piece, the electric connecting piece comprises at least two layers of connecting sheets stacked along a first direction, and the battery monomers are connected with at least one layer of connecting sheets. According to the battery pack, different battery monomers can be connected through the electric connecting piece, the electric connecting piece is formed by laminating a plurality of layers of connecting sheets, and external vibration impact on the electric connecting piece can be counteracted by utilizing interlayer binding force of the plurality of layers of connecting sheets in the use process of the battery pack, so that the service life of the battery pack is prolonged. Therefore, the risk of cracking at the joint of the electric connecting piece and the battery monomer can be effectively reduced, the connection firmness of the electric connecting piece and the battery monomer can be improved, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery manufacturing technology, and specifically relates to a battery pack and electrical equipment. Background Art

[0002] With the continuous development of the new energy vehicle industry, power batteries, as the power source of new energy vehicles, play a vital role in new energy vehicles. As the core component of power batteries, battery modules have increasingly higher safety performance requirements.

[0003] Usually, a battery module includes multiple cells, and two adjacent cells are connected in series and parallel via connectors, which are welded to the poles of the two cells. However, during the use of the battery module, due to external vibration and impact, cracking and other problems are prone to occur at the welding point between the connector and the cell, affecting the safety performance of the battery module. Utility Model Content

[0004] The present application aims to provide a battery pack and an electrical device, which at least solves the problem that cracks are easily generated at the welding points between the connectors and the battery cells in the battery modules of the related art, which is one of the problems affecting the safety performance of the battery pack.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application proposes a battery pack, comprising: a battery cell and an electrical connector, wherein the electrical connector comprises at least two layers of connecting sheets stacked along a first direction, and the battery cell is connected to at least one layer of the connecting sheets.

[0007] Optionally, the connecting piece includes a connecting portion, and mounting portions provided on both sides of the connecting portion along a second direction, and the second direction intersects with the first direction;

[0008] The mounting portion is electrically connected to the battery cell, and the connecting portion is bent from a side of the connecting sheet away from the battery cell toward a direction close to the battery cell.

[0009] Optionally, along a third direction, at least one end of the connecting piece is provided with an opening structure, and the third direction intersects with the first direction.

[0010] Optionally, the connecting piece includes a connecting portion, and mounting portions arranged on both sides of the connecting portion along a second direction; the connecting portion and the mounting portion define the opening structure, and the opening structure and the connecting portion are arranged along a third direction, and the third direction intersects with a plane formed by the first direction and the second direction.

[0011] Optionally, along the third direction, the maximum dimension of the connecting portion is D1 mm, the maximum size of the opening structure is D 2 mm, satisfying: 0.7≤D 2 / D 1 ≤2.

[0012] Optionally, along the second direction, the maximum size of the opening structure is H 1 mm, the maximum size of the connecting piece is H 2 mm, satisfying: 0.1≤H 1 / H 2 ≤0.3.

[0013] Optionally, along the first direction, the thickness of the connecting sheet is L 1 mm, the thickness of the electrical connector is L 2 mm, satisfying: 2.5≤L 2 / L 1 ≤15.

[0014] Optionally, along the first direction, the thickness of the connecting sheet is L 1 mm, satisfying: 0.1≤L 1 ≤0.3.

[0015] Optionally, along the first direction, the thickness of the electrical connector is L 2 mm, satisfying: 1.5≤L 2 ≤2.5.

[0016] Optionally, two adjacent layers of the connecting sheets are fixed by welding.

[0017] Optionally, the connecting portion and the mounting portion are integrally formed.

[0018] In a second aspect, an embodiment of the present application proposes an electrical device, comprising a battery pack as described in any one of the above items.

[0019] In an embodiment of the present application, a battery pack includes a battery cell and an electrical connector. The connection between different battery cells can be achieved through the electrical connector. The electrical connector is formed by stacking multiple layers of connecting sheets. During the use of the battery pack, the interlayer bonding force of the multiple layers of connecting sheets can be used to offset the external vibration impact on the electrical connector, thereby effectively reducing the risk of cracking at the connection between the electrical connector and the battery cell, increasing the connection firmness between the electrical connector and the battery cell, and improving the safety performance of the battery pack.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of an electrical connector according to an embodiment of the present application;

[0024] Figure 3 is an exploded view of an electrical connector according to an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of a connecting sheet according to an embodiment of the present application;

[0026] Figure 5 is a front view of a connecting piece according to an embodiment of the present application;

[0027] Figure 6 It is a cross-sectional view of the connecting sheet along the thickness direction according to an embodiment of the present application.

[0028] Reference numerals:

[0029] 10: electrical connector; 100: connecting piece; 110: mounting portion; 120: connecting portion; 130: opening structure; X: first direction; Y: second direction; Z: third direction; 20: battery cell. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0031] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The battery pack and electrical equipment provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0036] like Figures 1 to 3 As shown, a battery pack according to some embodiments of the present application includes a battery cell 20 and an electrical connector 10, wherein the electrical connector 10 is connected to the battery cell 20, and the electrical connector 10 includes at least two layers of connecting sheets 100 stacked along a first direction X, wherein the battery cell 20 is connected to at least one layer of connecting sheets 100.

[0037] In the embodiment of the present application, the battery pack includes a battery cell 20 and an electrical connector 10. The electrical connector 10 can be used to connect different battery cells 20. The electrical connector 10 is formed by stacking multiple layers of connecting sheets 100. During the use of the battery pack, the interlayer bonding force of the multiple layers of connecting sheets 100 can offset the external vibration impact on the electrical connector 10, thereby effectively reducing the risk of cracking at the connection between the electrical connector 10 and the battery cell 20, increasing the connection firmness between the electrical connector 10 and the battery cell 20, and improving the safety performance of the battery pack.

[0038] Specifically, the battery pack may include at least two battery cells 20, the electrical connector 10 is connected between the two battery cells 20, each battery cell 20 is provided with a pole, and the electrical connector 10 is connected to the pole of the battery cell 20, so that the electrical connector 10 can be used to realize series or parallel connection between different battery cells 20.

[0039] For example, the electrical connector 10 may be fixed to the pole of the battery cell 20 by welding, so that the connection strength between the electrical connector 10 and the pole can be ensured and the electrical connection between the electrical connector 10 and the pole can be achieved.

[0040] The electrical connector 10 includes at least two layers of connection sheets 100 , which are stacked in sequence along a first direction X. Two adjacent layers of connection sheets 100 are connected to each other, and an interface bonding force is formed between the two adjacent layers of connection sheets 100 .

[0041] In specific applications, when the battery pack is subjected to external vibration impact, the impact force will be transmitted between the multi-layer connecting sheets 100. During the force transmission process, it is offset by the interface bonding force between the connecting sheets 100, and can absorb the impact caused by the external vibration, thereby avoiding the cracking problem at the connection between the electrical connector 10 and the battery cell 20 caused by the vibration impact.

[0042] In some embodiments, the connecting sheet 100 can be made of a hard conductive material, for example, a conductive metal material such as copper, iron, steel, aluminum, etc., or a non-metallic conductive material such as graphite, conductive fiber, etc.

[0043] Of course, the connecting sheet 100 may also be made of other conductive materials, and those skilled in the art may select the materials according to actual needs, and this application does not impose any limitation thereto.

[0044] In some embodiments, two adjacent layers of connecting sheets 100 are fixed by welding. By welding each layer of connecting sheets 100 in the electrical connector 10 to the adjacent connecting sheets 100, the connection strength between the connecting sheets 100 can be ensured, and at the same time, the conductivity between the connecting sheets 100 can be achieved, so that the electrical connector 10 can be used to achieve electrical connection between different battery cells 20.

[0045] In addition, two adjacent layers of connecting sheets 100 may be fixedly connected by pressing or other methods. Of course, other fixed connection methods may be used between two adjacent layers of connecting sheets 100, which is not limited in the embodiment of the present application.

[0046] Alternatively, if Figure 4 As shown, the connecting piece 100 includes a connecting portion 120 and mounting portions 110 arranged on both sides of the connecting portion 120 along a second direction Y, and the second direction Y intersects with the first direction X; the mounting portion 110 is electrically connected to the battery cell 20, and the connecting portion 120 is bent from the side of the connecting piece 100 away from the battery cell 20 toward a direction close to the battery cell 20.

[0047] In the embodiment of the present application, the electrical connector 10 is formed by stacking multiple layers of connecting sheets 100, each connecting sheet 100 includes a connecting portion 120 and mounting portions 110 located on both sides of the connecting portion 120, the connecting sheet 100 is connected to the battery cell 20 through the mounting portion 110, and the connecting portion 120 is set to a curved structure. In this way, when the electrical connector 10 is used to connect different battery cells 20, the interlayer bonding force of the multiple layers of connecting sheets 100 can be used to absorb external vibration impact, thereby reducing the risk of cracking at the connection between the electrical connector 10 and the battery cell 20. At the same time, the curved structure of the connecting portion 120 can absorb the displacement changes generated during the cyclic use of the battery cell 20, thereby avoiding the problem of fracture of the electrical connector 10 due to local stress concentration, and improving the connection reliability of the electrical connector 10.

[0048] Specifically, the electrical connector 10 is formed by stacking at least two layers of connecting sheets 100 in sequence, and the structure of each layer of connecting sheets 100 is the same or similar. The connecting sheet 100 includes a connecting portion 120 and mounting portions 110 disposed on both sides of the connecting portion 120 along the second direction Y. The mounting portion of the electrical connector 10 can be formed by stacking the mounting portions 110 of a plurality of connecting sheets 100 in sequence, and two different battery cells 20 can be connected through the mounting portion of the electrical connector 10.

[0049] Furthermore, the connection portion 120 of each connecting sheet 100 is set to a curved structure, and the connection portion of the electrical connector 10 can be formed by stacking the connection portions 120 of multiple connecting sheets 100 in sequence. The connection portion of the electrical connector 10 also has a curved structure, and the curved structure is located between two battery cells 20.

[0050] It is understandable that during the cycle of battery cells 20, as the battery cells 20 are charged and discharged, the battery cells 20 will expand or shrink, and the deformation of different battery cells 20 in the battery pack is not completely consistent. Therefore, the relative positions of different battery cells 20 will change due to deformation, which will cause local compression or stretching of the electrical connector 10, resulting in tearing or breaking of the electrical connector 10 due to local stress concentration.

[0051] In the battery pack of the present application, a connecting portion 120 with a curved structure is formed in the electrical connector 10. When the electrical connector 10 is subjected to local force, the local force of the electrical connector 10 can be absorbed by the deformation of the connecting portion 120, thereby reducing the risk of cracking at the connection between the mounting portion 110 and the battery cell 20, and effectively avoiding local tearing or breakage of the electrical connector 10.

[0052] Alternatively, if Figure 4 As shown, the connecting portion 120 and the mounting portion 110 are integrally formed. In the embodiment of the present application, by setting the connecting portion 120 and the mounting portion 110 in the connecting sheet 100 as an integrally formed structure, the processing and manufacturing of the connecting sheet 100 is facilitated, and the connection strength between the connecting portion 120 and the mounting portion 110 can be improved.

[0053] Alternatively, if Figure 4 As shown, along the third direction Z, at least one end of the connecting sheet 100 is provided with an opening structure 130, and the third direction Z intersects with the first direction X.

[0054] It is understandable that the electrical connector 10 is connected between two battery cells 20. During the recycling of the battery cells 20, displacement will occur between the two battery cells 20, thereby generating a twisting force on the electrical connector 10. As the electrical connector 10 is continuously twisted, the electrical connector 10 is prone to tearing at the edge.

[0055] In the embodiment of the present application, an opening structure 130 is provided at at least one end of the connecting piece 100, and the opening structure 130 on the connecting piece 100 can absorb the local stress concentration caused by the twisting deformation of the electrical connector 10 during use, thereby improving the anti-bending performance of the electrical connector 10 to cope with the stress deformation along different directions during use, thereby effectively avoiding the local tearing problem caused by the local stress concentration of the electrical connector 10.

[0056] It should be noted that the first direction X is the stacking direction of the connecting sheet 100 , and the third direction Z intersects with the first direction X, wherein the third direction Z can be set to be perpendicular to the first direction X, but is not limited to being perpendicular to the first direction X.

[0057] Alternatively, if Figure 4 and Figure 5 As shown, the connecting piece 100 includes a connecting portion 120 and mounting portions 110 arranged on both sides of the connecting portion 120 along the second direction Y; the connecting portion 120 and the mounting portion 110 define an opening structure 130, and the opening structure 130 and the connecting portion 120 are arranged along a third direction Z, and the third direction Z intersects with a plane formed by the first direction X and the second direction Y.

[0058] In the embodiment of the present application, the electrical connector 10 is formed by stacking multiple layers of connecting sheets 100, each connecting sheet 100 includes a connecting portion 120 and mounting portions 110 located on both sides of the connecting portion 120, and an opening structure 130 is defined by the connecting portion 120 and the mounting portion 110. In this way, when the electrical connector 10 is used to connect different battery cells 20, the interlayer bonding force of the multiple layers of connecting sheets 100 can be used to offset the external vibration impact, thereby reducing the risk of cracking at the connection between the electrical connector 10 and the battery cell 20. At the same time, the opening structure 130 on the connecting sheet 100 can absorb the local stress concentration caused by the twisting and deformation of the electrical connector 10 during use, thereby effectively avoiding the local tearing problem caused by the local stress concentration of the electrical connector 10.

[0059] Specifically, the electrical connector 10 is formed by at least two layers of connecting sheets 100 stacked in sequence along a first direction X, each connecting sheet 100 includes a connecting portion 120, and mounting portions 110 arranged on both sides of the connecting portion 120 along a second direction Y, and an opening structure 130 is arranged on at least one side of the connecting portion 120 along a third direction Z, and along the second direction Y, the connecting portion 120 and the opening structure 130 are both located between the two mounting portions 110.

[0060] Alternatively, if Figure 5 As shown, along the third direction Z, the maximum dimension of the connecting portion 120 is D 1 mm, the maximum dimension of the opening structure 130 is D 2 mm, satisfying: 0.7≤D 2 / D 1 ≤2.

[0061] In the embodiment of the present application, by setting the maximum size D of the connecting portion 120 1 The maximum dimension D of the opening structure 130 2 The ratio range between 100 and 100 mm can ensure the connection strength of the connecting portion 120 while utilizing the opening structure 130 to provide sufficient deformable space for the twisting and deformation of the electrical connector 10, so as to improve the connection performance and service life of the electrical connector 10.

[0062] In some embodiments, the maximum dimension D of the connecting portion 120 is 1 The maximum dimension D of the opening structure 1302 The ratio D 2 / D 1 It can be set to any value such as 0.7, 0.8, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.7, 2.0, or a range between any two values.

[0063] In specific applications, such as Figure 5 As shown, along the third direction Z, the connecting portion 120 includes two opposite ends. A caliper can be used to measure the distance between the two ends of the connecting portion 120 along the third direction Z, and at least three distance values ​​are measured, and the maximum value of the at least three distance values ​​is used as the maximum size D of the connecting portion 120. 1 .

[0064] Accordingly, along the third direction Z, the opening structure 130 includes an opening and a bottom portion opposite to each other. The depth from the opening to the bottom portion of the opening structure 130 along the third direction Z can be measured using the inner ruler of the caliper, and at least three depth values ​​can be measured to obtain the maximum value of the at least three depth values ​​as the maximum dimension D of the opening structure 130. 2 .

[0065] It should be noted that the maximum size D of the connecting portion 120 is 1 and the maximum dimension D of the opening structure 130 2 During the measurement process, the measuring tools and methods used should be consistent to reduce equipment errors and human errors. Of course, the maximum size D of the connecting portion 120 is 1 and the maximum dimension D of the opening structure 130 2 The specific measurement method and measurement tools can be selected according to actual needs, and the embodiments of the present application do not limit this.

[0066] Alternatively, if Figure 5 As shown, along the second direction Y, the maximum size of the opening structure 130 is H 1 mm, the maximum dimension H of the connecting piece 100 2 mm.

[0067] Alternatively, if Figure 6 As shown, along the first direction X, the thickness of the connecting sheet 100 is L 1 mm, the thickness of the electrical connector 10 is L 2 mm.

[0068] In a specific application, the structural strength of the electrical connector 10 and the performance of the battery pack formed by the electrical connector 10 and the battery cell 20 can be measured. The specific measurement method is as follows:

[0069] 1. Structural strength test method of the electrical connector 10: GB / T228.1-2021 Metal Materials-Tensile Test.

[0070] 2. Test method of the first-order mode of the battery pack in Z direction:

[0071] Fix the battery pack on the test bench, arrange acceleration and amplitude sensors, and perform a sinusoidal frequency sweep of 5 to 250 Hz in the Z direction of the battery pack at an acceleration of 0.5 g in a 25°C environment. The sweep rate is 1.0 (oct / min). The frequency when the battery pack produces the maximum amplitude is recorded as the first-order mode of the battery pack in the Z direction.

[0072] In some embodiments, H 1 The value is 20, H 2 The value is 100, L 1 The value is 0.2, L 2 The value is 1.5, by setting the maximum size D of the connecting portion 120 in the electrical connector 10 1 The maximum dimension D of the opening structure 130 2 The different ratios are used to detect the structural strength of the electrical connector 10 corresponding to the different ratios, and the electrical performance of the battery pack including the electrical connector 10. The specific test results are shown in Table 1:

[0073] Table 1

[0074]

[0075]

[0076] It can be seen from the test results in Table 1 that the maximum dimension D of the connecting portion 120 is 1 The maximum dimension D of the opening structure 130 2 D 2 / D 1 When the ratio is between [0.7, 2], the structural strength of the electrical connector 10 is relatively high, and the connection strength between the battery cells 20 can be improved by connecting two battery cells 20 with the electrical connector 10. In addition, it helps to improve the first-order mode of the battery pack formed by the electrical connector 10 and the battery cells 20, thereby improving the overall safety performance of the battery pack.

[0077] Alternatively, if Figure 5 As shown, in some embodiments, the battery pack satisfies: 0.1≤H 1 / H 2 ≤0.3.

[0078] In the embodiment of the present application, by setting the maximum size H of the opening structure 130 1 The maximum dimension H of the connecting piece 100 2The ratio range between them can be such that the opening structure 130 can be used to provide sufficient deformable space for the twisting and deformation of the electrical connector 10, while also preventing the opening structure 130 from being too large in size and affecting the connection strength of the electrical connector 10.

[0079] In a specific application, along the second direction Y, the opening structure 130 has two opposite side walls. A caliper is used to measure the distance between the two side walls of the opening structure 130 along the second direction Y, and at least three distance values ​​are measured. The maximum value of the at least three distance values ​​is used as the maximum size H of the opening structure 130. 1 .

[0080] Accordingly, along the second direction Y, the connecting piece 100 has two opposite side edges. The distance between the two side edges of the connecting piece 100 along the second direction Y is measured with a caliper, and at least three distance values ​​are measured, and the maximum value of the at least three distance values ​​is taken as the maximum size H of the connecting piece 100. 2 .

[0081] It should be noted that the maximum size H of the opening structure 130 is 1 and the maximum dimension H of the connecting piece 100 2 During the measurement process, the measuring tools and methods used should be consistent to reduce equipment errors and human errors. Of course, the maximum size H of the opening structure 130 1 and the maximum dimension H of the connecting piece 100 2 The specific measurement method and measurement tools can be selected according to actual needs, and the embodiments of the present application do not limit this.

[0082] In some embodiments, the maximum size H of the opening structure 130 is 1 The maximum dimension H of the connecting piece 100 2 The ratio H 1 / H 2 It can be set to any value such as 0.1, 0.15, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.27, 0.3, or a range between any two values.

[0083] In some embodiments, D 1 The value is 42, D 2 The value is 42, L 1 The value is 0.2, L 2 The value is 1.5, by setting the maximum size H of the opening structure 130 in the electrical connector 10 1 and the maximum dimension H of the connecting piece 100 2The different ratios are used to test the structural strength of the electrical connector 10 corresponding to the different ratios, and the electrical performance of the battery pack including the electrical connector 10. The specific test results are shown in Table 2:

[0084] Table 2

[0085]

[0086] It can be seen from the test results in Table 2 that when the maximum size H of the opening structure 130 is 1 The maximum dimension H of the connecting piece 100 2 The ratio H 1 / H 2 When the value range of is between [0.1, 0.3], the structural strength of the electrical connector 10 is relatively high, and the connection strength between the battery cells 20 can be improved by connecting two battery cells 20 with the electrical connector 10. In addition, it helps to increase the first-order modal frequency of the battery pack formed by the electrical connector 10 and the battery cells 20, thereby improving the safety performance of the battery pack.

[0087] Alternatively, if Figure 6 As shown, the battery pack meets: 2.5≤L 2 / L 1 ≤15.

[0088] In the embodiment of the present application, by setting the thickness L of the connecting sheet 100 1 The thickness of the electrical connector 10 is L 2 The ratio range between them is such that the electrical connector 10 has a certain number of connecting sheets 100, so that the interlayer bonding force between different connecting sheets 100 can be used to offset the external vibration impact on the electrical connector 10. At the same time, it also avoids that the number of layers of connecting sheets 100 in the electrical connector 10 is too large, which affects the overall deformability of the electrical connector 10.

[0089] In some embodiments, the thickness L of the connecting sheet 100 is 1 The thickness L of the electrical connector 10 2 The ratio L 2 / L 1 It can be set to any value such as 2.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 12, 15, or a range between any two values.

[0090] In a specific application, along the first direction X, the connecting sheet 100 has two opposite side surfaces. The thickness between the two side surfaces of the connecting sheet 100 along the first direction X is measured using a caliper, and at least three thickness values ​​are measured, and the maximum value of the at least three thickness values ​​is taken as the thickness L of the connecting sheet 100. 1 .

[0091] Accordingly, along the first direction X, the electrical connector 10 has two opposite side surfaces. The thickness between the two side surfaces of the electrical connector 10 along the first direction X is measured using a caliper, and at least three thickness values ​​are measured, and the maximum value of the at least three thickness values ​​is taken as the thickness L of the electrical connector 10. 2 .

[0092] It should be noted that when the thickness L of the connecting sheet 100 is 1 and the thickness L of the electrical connector 10 2 During the measurement process, the measuring tools and methods used should be consistent to reduce equipment errors and human errors. 1 and the thickness L of the electrical connector 10 2 The specific measurement method and measurement tools can be selected according to actual needs, and the embodiments of the present application do not limit this.

[0093] In some embodiments, H 1 The value is 20, H 2 The value is 100, D 1 The value is 42, D 2 The value is 42, by setting the thickness L of the connecting piece 100 in the electrical connector 10 1 The thickness L of the electrical connector 10 2 The different ratios are used to test the structural strength of the electrical connector 10 corresponding to the different ratios, and the electrical performance of the battery pack including the electrical connector 10. The specific test results are shown in Table 3:

[0094] Table 3

[0095]

[0096]

[0097] It can be seen from the test results in Table 3 that when the thickness L of the connecting sheet 100 1 The thickness L of the electrical connector 10 2 The ratio L 2 / L 1 When the value range of is between [2.5,15], the structural strength of the electrical connector 10 is relatively high, and the connection strength between the battery cells 20 can be improved by connecting two battery cells 20 with the electrical connector 10. In addition, it helps to improve the first-order mode of the battery pack formed by the electrical connector 10 and the battery cells 20, thereby improving the safety performance of the battery pack.

[0098] Alternatively, if Figure 6 As shown, along the first direction X, the thickness of the connecting sheet 100 is L 1 mm, satisfying: 0.1≤L1 ≤0.3.

[0099] In the embodiment of the present application, by setting the thickness L of each layer of the connecting sheet 100 1 The value range is such that the connecting sheet 100 has a certain mechanical strength and a certain flexible deformation ability, so that when a plurality of connecting sheets 100 are stacked to form an electrical connector 10, the electrical connector 10 can not only meet the connection strength requirements between different battery cells 20, but also have a certain deformability to offset external impacts and local stress concentration.

[0100] In some embodiments, the thickness L of the connecting sheet 100 is 1 It can be set to any value such as 0.1mm, 0.13mm, 0.15mm, 0.17mm, 0.2mm, 0.25mm, 0.28mm, 0.3mm, or a range between any two values.

[0101] It is understandable that the thickness L of the connecting sheet 100 1 The specific measurement method can be found in the above content, and the embodiments of the present application will not be repeated here.

[0102] Alternatively, if Figure 6 As shown, along the first direction X, the thickness of the electrical connector 10 is L 2 mm, satisfying: 1.5≤L 2 ≤2.5.

[0103] In the embodiment of the present application, by setting the thickness of the electrical connector 10 to L 2 The value range is such that the electrical connector 10 has a certain thickness, while ensuring the connection performance of the electrical connector 10, avoiding the electrical connector 10 being too thick to occupy the structural space of the battery pack.

[0104] In some embodiments, the thickness L of the electrical connector 10 is 2 It can be set to any value such as 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, or a range between any two values.

[0105] It is understandable that the thickness L of the electrical connector 10 2 The specific measurement method can be found in the above content, and the embodiments of the present application will not be repeated here.

[0106] Optionally, an embodiment of the present application further provides an electrical device, which includes the battery pack in any of the above embodiments.

[0107] In the embodiment of the present application, the battery pack includes a battery cell 20 and an electrical connector 10. The electrical connector 10 can be used to connect different battery cells 20. The electrical connector 10 is formed by stacking multiple layers of connecting sheets 100. During the use of the battery pack, the interlayer bonding force of the multiple layers of connecting sheets 100 can offset the external vibration impact on the electrical connector 10, thereby effectively reducing the risk of cracking at the connection between the electrical connector 10 and the battery cell 20, increasing the connection firmness between the electrical connector 10 and the battery cell 20, and improving the safety performance of the battery pack.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0109] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A battery cell (20) and an electrical connector (10), wherein the electrical connector (10) comprises at least two layers of connecting sheets (100) stacked along a first direction (X), and the battery cell (20) is connected to at least one layer of the connecting sheet (100).

2. The battery pack according to claim 1, characterized in that: The connecting piece (100) comprises a connecting portion (120), and mounting portions (110) arranged on both sides of the connecting portion (120) along a second direction (Y), wherein the second direction (Y) intersects with the first direction (X); The mounting portion (110) is electrically connected to the battery cell (20), and the connecting portion (120) is bent from a side of the connecting sheet (100) away from the battery cell (20) toward a direction close to the battery cell (20).

3. The battery pack according to claim 1, characterized in that: At least one end of the connecting sheet (100) is provided with an opening structure (130) along a third direction (Z), and the third direction (Z) intersects with the first direction (X).

4. The battery pack according to claim 3, characterized in that: The connecting piece (100) comprises a connecting portion (120) and mounting portions (110) arranged on both sides of the connecting portion (120) along a second direction (Y); the connecting portion (120) and the mounting portion (110) define the opening structure (130), and the opening structure (130) and the connecting portion (120) are arranged along a third direction (Z), and the third direction (Z) intersects with a plane formed by the first direction (X) and the second direction (Y).

5. The battery pack according to claim 4, characterized in that: Along the third direction (Z), the maximum dimension of the connecting portion (120) is D1 mm, and the maximum dimension of the opening structure (130) is D2 mm, satisfying: 0.7≤D2 / D1≤2.

6. The battery pack according to claim 4, characterized in that: Along the second direction (Y), the maximum size of the opening structure (130) is H1 mm, and the maximum size of the connecting sheet (100) is H2 mm, satisfying: 0.1≤H1 / H2≤0.

3.

7. The battery pack according to claim 1, characterized in that: Along the first direction (X), the thickness of the connecting sheet (100) is L1 mm, and the thickness of the electrical connecting piece (10) is L2 mm, satisfying: 2.5≤L2 / L1≤15.

8. The battery pack according to claim 1, characterized in that: Along the first direction (X), the thickness of the connecting sheet (100) is L1 mm, satisfying: 0.1≤L1≤0.

3.

9. The battery pack according to claim 1, characterized in that: Along the first direction (X), the thickness of the electrical connector (10) is L2 mm, satisfying: 1.5≤L2≤2.

5.

10. The battery pack according to claim 1, characterized in that: Two adjacent layers of the connecting sheets (100) are fixed by welding.

11. The battery pack according to claim 2 or 4, characterized in that: The connecting portion (120) and the mounting portion (110) are integrally formed.

12. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 11.

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