Electric connection sheet, battery pack and electric equipment

Abstract

The embodiment of the utility model provides an electric connecting piece, a battery pack and electric equipment. The electric connecting piece comprises a concave part and two fixing parts, the two fixing parts are arranged in a spaced mode in the first direction, the fixing parts are used for being connected with the pole columns, and the concave part is arranged between the two fixing parts and connected with the two fixing parts respectively; in the second direction, the sunken part is provided with a middle area and edge areas located on the two sides of the middle area, and the width of the sunken part in the middle area in the first direction is smaller than that of the sunken part in the edge areas in the first direction. By arranging the concave part with the narrow middle part and the wide edge, the whole electric connecting piece has certain ductility in multiple directions, so that the displacement change of the pole in different directions can be buffered, the pole and the electric connecting piece are effectively connected, and the connection stability between the single battery and the electric connecting piece is facilitated.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to an electrical connecting piece, a battery pack and an electrical device. Background Art

[0002] The battery pack is the power source of the electric vehicle, and generally includes a plurality of single cells and an electrical connection sheet, wherein the electrical connection sheet is used to connect two adjacent single cells. Specifically, each single cell is provided with a pole, and the electrical connection sheet is respectively connected to the poles of two adjacent single cells to connect the two adjacent single cells.

[0003] However, since the electrical connecting plate is usually a flat structure, when the battery pack expands or is affected by external vibration, the poles of two adjacent single cells will be displaced, which may cause the poles and the electrical connecting plate to fail to maintain an effective connection, affecting the connection stability between the electrical connecting plate and the single cell. Utility Model Content

[0004] The present application aims to provide an electrical connection piece, a battery pack and an electrical device to solve the problem that when the pole of the existing single battery is displaced, the pole and the electrical connection piece cannot maintain an effective connection.

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

[0006] In a first aspect, the present application discloses an electrical connection sheet, which is applied to a battery pack, wherein the battery pack includes a single battery, wherein the single battery is provided with a pole, wherein the electrical connection sheet has a first direction and a second direction perpendicular to each other, and wherein the electrical connection sheet includes: a recessed portion and two fixing portions;

[0007] The two fixing parts are arranged at intervals along the first direction, the fixing parts are used to be connected to the pole, and the recessed part is arranged between the two fixing parts and is respectively connected to the two fixing parts;

[0008] Along the second direction, the recessed portion has a middle area and edge areas on both sides of the middle area, and a width of the recessed portion in the middle area along the first direction is smaller than a width of the recessed portion in the edge areas along the first direction.

[0009] Optionally, along the direction from the middle area to the edge area, the width of the recessed portion along the first direction increases gradually.

[0010] Optionally, along the direction from the middle region to the edge region, the width of the recessed portion in the middle region along the first direction is the same, and the width of the recessed portion in the edge region along the first direction increases gradually.

[0011] Optionally, along the direction from the middle region to the edge region, the width of the recessed portion in the middle region along the first direction increases gradually, and the width of the recessed portion in the edge region along the first direction is the same.

[0012] Optionally, the recessed portion further comprises a transition region;

[0013] The transition region is located between the middle region and the edge region;

[0014] Along the direction from the middle area to the edge area, the width of the recessed portion in the middle area along the first direction is the same, the width of the recessed portion in the transition area along the first direction increases gradually, and the width of the recessed portion in the edge area along the first direction is the same.

[0015] Optionally, the fixing portion and the recessed portion are an integrally formed structure.

[0016] Optionally, the electrical connection sheet further includes a third direction, and the third direction is perpendicular to the first direction and the second direction respectively;

[0017] The recessed portion includes multiple layers of metal sheets, which are stacked in sequence along the third direction, and two ends of each of the metal sheets along the first direction are respectively connected to two fixing portions.

[0018] In a second aspect, the present application further discloses a battery pack, the battery pack comprising:

[0019] At least two single cells, at least two of which are arranged in sequence along the first direction, each of which comprises a top cover arranged perpendicular to a third direction and a pole arranged on the top cover, and the third direction is perpendicular to the first direction and the second direction respectively;

[0020] And the electrical connecting piece described in any of the above items, the two fixing parts are respectively connected to the poles of two adjacent single cells, the recessed part is located between the poles of two adjacent single cells, and the recessed part is recessed toward the direction of the top cover.

[0021] Optionally, the battery pack further comprises an isolation plate, wherein the isolation plate is arranged on a side of the top cover away from the center of the single battery;

[0022] The isolation plate is provided with an installation groove at a corresponding position of the electrical connection sheet, the installation groove has a bottom wall and a side wall, the bottom wall is provided with a through hole, the pole is passed through the through hole to be connected with the electrical connection sheet, and the side wall is provided with one of an anti-error protrusion or an anti-error depression;

[0023] The electrical connection sheet has a peripheral wall, and the peripheral wall is provided with the anti-error protrusion or the anti-error recess, and the anti-error protrusion is embedded in the anti-error recess.

[0024] In a third aspect, the present application further discloses an electrical device, which includes the above-mentioned battery pack.

[0025] In the embodiment of the present application, the electrical connection sheet includes: a recessed portion and two fixed portions; the two fixed portions are arranged at intervals along the first direction, the fixed portion is used to connect with the pole, the recessed portion is arranged between the two fixed portions and is respectively connected with the two fixed portions; along the second direction, the recessed portion has a middle area and edge areas located on both sides of the middle area, and the width of the recessed portion in the middle area along the first direction is smaller than the width of the recessed portion in the edge area along the first direction. In this way, when the poles of two adjacent single cells are displaced due to expansion of the battery pack or the influence of external vibration, on the one hand, since the recessed portion is arranged between the two fixed portions, that is, the electrical connection sheet as a whole has a certain ductility, the displacement change of the pole can be buffered by the deformation of the recessed portion, so that the pole and the electrical connection sheet are reliably connected together. On the other hand, since the width of the recessed portion in the middle area along the first direction is smaller than the width of the recessed portion in the edge area along the first direction, that is, the recessed portion is roughly in the shape of a narrow middle and wide edges. In this way, the recessed portion can have a greater ability to deform in a larger direction and angle, so that the electrical connecting piece as a whole has a certain degree of ductility in multiple directions, thereby buffering the displacement changes of the pole in different directions, so that the pole and the electrical connecting piece maintain an effective connection, which is beneficial to the connection stability between the single battery and the electrical connecting piece.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 It is a schematic diagram of the structure of an electrical connecting sheet provided in Example 1 of the present application;

[0029] Figure 2 This is a schematic diagram of the structure of an electrical connecting sheet provided in Embodiment 2 of the present application;

[0030] Figure 3 This is a schematic diagram of the structure of an electrical connecting sheet provided in Embodiment 3 of the present application;

[0031] Figure 4This is one of the structural schematic diagrams of an electrical connecting sheet provided in the fourth embodiment of the present application;

[0032] Figure 5 This is the second structural schematic diagram of an electrical connecting sheet provided in the fourth embodiment of the present application;

[0033] Figure 6 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0034] Figure 7 It is a schematic diagram of the structure of an isolation plate of a battery pack provided in an embodiment of the present application.

[0035] Figure numerals: 1. Electrical connecting piece, 11. Recessed portion, 111. Middle area, 112. Edge area, 113. Transition area, 12. Fixing portion, 121. Positioning hole, 13. Peripheral wall, 131. Anti-error recess, 2. Single battery cell, 21. Pole, 22. Top cover, 23. Isolation plate, 231. Mounting groove, 2311. Bottom wall, 23111. Through hole, 2312. Side wall, 23121. Anti-error protrusion, X. First direction, Y. Second direction, Z. Third direction. DETAILED DESCRIPTION

[0036] The embodiments of the utility model 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 utility model, and cannot be understood as limiting the utility model. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] 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 utility model, unless otherwise specified, "multiple" 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.

[0038] In the description of the present invention, 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 invention 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 invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the present invention can be understood according to specific circumstances.

[0040] An embodiment of the present application provides an electrical connecting sheet, which will be described in detail below with reference to the accompanying drawings.

[0041] Reference Figures 1 to 5 , showing a schematic diagram of the structure of four electrical connecting sheets provided in the embodiment of the present application, referring to Figure 6 , showing a schematic diagram of the structure of a battery pack provided in an embodiment of the present application, referring to Figure 7 , shows a schematic diagram of the structure of a separator of a battery pack provided in an embodiment of the present application. It should be noted that, for ease of understanding, the drawings of the embodiment of the present application schematically separate the middle area 111, the edge area 112 and the transition area 113 with dotted lines.

[0042] like Figures 1 to 5 As shown, the present application provides an electrical connection sheet 1, which is applied to a battery pack. The battery pack includes a single battery 2, and the single battery 2 is provided with a pole 21. The electrical connection sheet 1 has a first direction X and a second direction Y that are perpendicular to each other. The electrical connection sheet 1 includes: a recessed portion 11 and two fixing portions 12; the two fixing portions 12 are arranged at intervals along the first direction X, and the fixing portions 12 are used to connect with the pole 21. The recessed portion 11 is arranged between the two fixing portions 12 and is respectively connected to the two fixing portions 12; along the second direction Y, the recessed portion 11 has a middle area 111 and edge areas 112 located on both sides of the middle area 111, and the width of the recessed portion 11 in the middle area 111 along the first direction X is smaller than the width of the recessed portion 11 in the edge area 112 along the first direction X.

[0043] In the embodiment of the present application, when the battery pack expands or is affected by external vibration, causing the poles 21 of two adjacent single cells 2 to be displaced, on the one hand, since the recessed portion 11 is provided between the two fixing portions 12, that is, the electrical connection sheet 1 as a whole has a certain ductility, the displacement change of the pole 21 can be buffered by the deformation of the recessed portion 11, so that the pole 21 and the electrical connection sheet 1 are reliably connected together. On the other hand, since the width of the recessed portion 11 in the middle area 111 along the first direction X is smaller than the width of the recessed portion 11 in the edge area 112 along the first direction X, that is, the recessed portion 11 is roughly in the shape of a narrow middle and wide edge. In this way, the recessed portion 11 can have a greater deformation capacity in a larger direction angle, so that the electrical connection sheet 1 as a whole has a certain ductility in multiple directions, so that the displacement change of the pole 21 in different directions can be buffered, so that the pole 21 and the electrical connection sheet 1 maintain an effective connection, which is beneficial to the connection stability between the single cell 2 and the electrical connection sheet 1.

[0044] It should be noted that the first direction X refers to the length direction of the electrical connection sheet 1, the second direction Y refers to the width direction of the electrical connection sheet 1, and the third direction Z refers to the thickness direction of the electrical connection sheet 1. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. In practical applications, each single cell 2 is provided with two poles 21, namely a positive pole and a negative pole. The electrical connection sheet 1, also known as a busbar, is used to connect two adjacent single cells 2 to achieve convergence. Specifically, the two fixing portions 12 of the electrical connection sheet 1 are respectively connected to the positive pole of one of the two adjacent single cells 2 and the negative pole of the other one to achieve convergence, wherein the current flows along the length direction of the electrical connection sheet 1, namely the first direction X. In addition, in practical applications, the battery pack generally also includes a voltage acquisition terminal, which is used to collect voltage information of the electrical connection sheet 1, thereby realizing real-time monitoring of the battery pack voltage. In the embodiment of the present application, the voltage collection terminal can be connected to the recessed portion 11. This not only avoids the voltage collection terminal from occupying the battery pack space, but also protects the voltage collection terminal from being damaged, which is beneficial to improving the reliability of voltage monitoring.

[0045] In practical applications, the fixing portion 12 and the recessed portion 11 can be integrally formed, or they can be separately formed and then connected. This is not limited here, and those skilled in the art can adjust it according to actual needs. It can be understood that when the fixing portion 12 and the recessed portion 11 are integrally formed, on the one hand, the processing technology of the electrical connection sheet 1 can be simplified, and on the other hand, the overall structural strength of the electrical connection sheet 1 can be improved. In one embodiment, the fixing portion 12 and the recessed portion 11 are integrally formed by stamping.

[0046] In practical applications, the recessed portion 11 of the electrical connecting sheet 1 provided in the embodiment of the present application has four specific structures, which are described in detail below in conjunction with the accompanying drawings.

[0047] Embodiment 1

[0048] like Figure 1 As shown, in one embodiment, the width of the recessed portion 11 along the first direction X increases gradually from the middle region 111 to the edge region 112. In this way, on the one hand, the direction angle of the deformation of the recessed portion 11 can be maximized, thereby effectively buffering the displacement changes of the pole 21 in different directions, so that the pole 21 and the electrical connection sheet 1 maintain an effective connection, which is beneficial to the connection stability between the single battery 2 and the electrical connection sheet 1. On the other hand, the recessed portion 11 has a simple structure, which can simplify the processing technology of the recessed portion 11, which is beneficial to reducing the processing cost of the electrical connection sheet 1.

[0049] Embodiment 2

[0050] like Figure 2 As shown, in one embodiment, along the direction from the middle area 111 to the edge area 112, the width of the recessed portion 11 in the middle area 111 along the first direction X is the same, and the width of the recessed portion 11 in the edge area 112 along the first direction X increases gradually. In this way, compared with the structure of the recessed portion 11 in the first embodiment, the recessed portion 11 in this embodiment can effectively alleviate the problem of stress concentration in the middle area 111, which is conducive to improving the overall structural strength of the electrical connection sheet 1.

[0051] Embodiment 3

[0052] like Figure 3 As shown, in one embodiment, along the direction from the middle area 111 to the edge area 112, the width of the recessed portion 11 in the middle area 111 along the first direction X increases gradually, and the width of the recessed portion 11 in the edge area 112 along the first direction X is the same. In this way, compared with the structure of the recessed portion 11 in the first embodiment, when the electrical connection sheet 1 connects two poles 21 with larger outer diameters, interference between the edge area 112 of the recessed portion 11 and the pole 21 can be effectively avoided, so that the electrical connection sheet 1 and the pole 21 are smoothly connected, which is conducive to improving the connection reliability between the electrical connection sheet 1 and the single battery 2.

[0053] Embodiment 4

[0054] like Figures 4 to 5As shown, in one embodiment, the recessed portion 11 further includes a transition area 113; the transition area 113 is located between the middle area 111 and the edge area 112; along the direction from the middle area 111 to the edge area 112, the width of the recessed portion 11 in the middle area 111 along the first direction X is the same, the width of the recessed portion 11 in the transition area 113 along the first direction X increases gradually, and the width of the recessed portion 11 in the edge area 112 along the first direction X is the same. In this way, compared with the structure of the recessed portion 11 in the first embodiment, on the one hand, the stress concentration problem in the middle area 111 can be effectively alleviated, which is conducive to improving the overall structural strength of the electrical connection sheet 1. On the other hand, when the electrical connection sheet 1 connects two poles 21 with larger outer diameters, interference between the edge area 112 of the recessed portion 11 and the pole 21 can be effectively avoided, so that the electrical connection sheet 1 and the pole 21 are smoothly connected, which is conducive to improving the connection reliability between the electrical connection sheet 1 and the single battery 2.

[0055] It should be noted that the middle area 111, the transition area 113 and the edge area 112 are distributed along the width of the electrical connection sheet 1, that is, the second direction Y. The middle area 111 refers to the area close to the center of the recessed portion 11, the edge area 112 refers to the area close to the edge of the recessed portion 11, and the transition area 113 refers to the area between the middle area 111 and the edge area 112. The middle area 111 and the edge areas 112 on both sides of the middle area 111 of the first to third embodiments can be symmetrically distributed or asymmetrically distributed; the middle area 111 of the fourth embodiment, the transition area 113 and the edge area 112 distributed on both sides of the middle area 111 can be symmetrically distributed or asymmetrically distributed, wherein the symmetrical distribution and / or asymmetrical distribution is based on the axis parallel to the first direction X and passing through the center of the recessed portion 11.

[0056] In practical applications, in order to further alleviate the stress concentration at the junction of the middle area 111, the edge area 112 and the transition area 113, the junctions of the middle area 111 and the edge area 112 of Examples 1 to 3 are rounded; the junctions of the middle area 111 and the transition area 113, and the junctions of the transition area 113 and the edge area 112 of Example 4 are all rounded.

[0057] In some optional embodiments of the present application, the electrical connecting sheet 1 also includes a third direction Z, which is perpendicular to the first direction X and the second direction Y respectively; the recessed portion 11 includes a plurality of layers of metal sheets, which are stacked in sequence along the third direction Z, and each metal sheet is connected to the two fixing portions 12 at both ends along the first direction X respectively.

[0058] In the embodiment of the present application, since the recessed portion 11 includes multiple layers of metal sheets stacked in sequence along the third direction Z, on the one hand, the heat dissipation area of ​​the recessed portion 11 can be increased, which is beneficial to the heat dissipation of the electrical connecting sheet 1; on the other hand, the overall flexibility of the recessed portion 11 can be improved, which is beneficial to improving the ability of the recessed portion 11 to buffer deformation.

[0059] It should be noted that, in one embodiment, both the recessed portion 11 and the fixed portion 12 include multi-layer metal sheets, that is, the electrical connection sheet 1 includes multi-layer metal sheets. During the processing, in order to make the fixed portion 12 reliably electrically connected to the pole 21, the multi-layer metal sheets of the fixed portion 12 are welded into a whole by polymer diffusion welding to ensure reliable current transmission, while the multi-layer metal sheets of the recessed portion 11 maintain a free multi-layer structure, wherein the metal sheets include but are not limited to aluminum foil. In another embodiment, the fixed portion 12 is a metal plate. During the processing, the two ends of each layer of the metal sheet of the recessed portion 11 along the first direction X are respectively connected to the metal plates on both sides, thereby realizing current transmission, wherein the metal plates include but are not limited to aluminum plates.

[0060] In summary, the electrical connecting sheet provided in the embodiments of the present application has at least the following advantages:

[0061] In the embodiment of the present application, the electrical connection sheet includes: a recessed portion and two fixed portions; the two fixed portions are arranged at intervals along the first direction, the fixed portion is used to connect with the pole, the recessed portion is arranged between the two fixed portions and is respectively connected with the two fixed portions; along the second direction, the recessed portion has a middle area and edge areas located on both sides of the middle area, and the width of the recessed portion in the middle area along the first direction is smaller than the width of the recessed portion in the edge area along the first direction. In this way, when the battery pack expands or is affected by external vibrations, causing the poles of two adjacent single cells to be displaced, on the one hand, since the recessed portion is arranged between the two fixed portions, that is, the electrical connection sheet as a whole has a certain degree of ductility, the displacement change of the pole can be buffered by the deformation of the recessed portion, so that the pole and the electrical connection sheet are reliably connected together. On the other hand, since the width of the recessed portion in the middle area along the first direction is smaller than the width of the recessed portion in the edge area along the first direction, that is, the recessed portion is roughly in a shape of narrow in the middle and wide at the edge, the recessed portion has a deformation ability in a larger direction angle. In this way, the electrical connecting piece as a whole has a certain ductility in multiple directions, which can buffer the displacement changes of the pole in different directions, further improve the connection reliability between the pole and the electrical connecting piece, and is conducive to the reliable transmission of electric energy.

[0062] like Figure 6As shown, an embodiment of the present application further provides a battery pack, comprising: at least two single cells 2, at least two single cells 2 are arranged in sequence along a first direction X, each single cell 2 comprises a top cover 22 arranged perpendicular to a third direction Z and a pole 21 arranged on the top cover 22, the third direction Z is respectively perpendicular to the first direction X and the second direction Y; and an electrical connecting sheet 1 of any of the above items, the two fixing portions 12 are respectively connected to the poles 21 of two adjacent single cells 2, the recessed portion 11 is located between the poles 21 of two adjacent single cells 2, and the recessed portion 11 is recessed toward the direction of the top cover 22.

[0063] In the embodiment of the present application, since the electrical connection sheet 1 includes two fixing portions 12, the confluence of two adjacent single cells 2 can be achieved by connecting the two fixing portions 12 with the poles 21 of two adjacent single cells 2. Since the electrical connection sheet 1 includes a recessed portion 11, the recessed portion 11 is located between the poles 21 of two adjacent single cells 2. Thus, on the one hand, the assembly tolerance of the battery pack assembly process can be eliminated so that the poles 21 and the electrical connection sheet 1 can be smoothly connected. On the other hand, when the battery pack expands or is affected by external vibrations, causing the poles 21 of two adjacent single cells 2 to be displaced, the recessed portion 11 can be deformed to buffer the displacement changes of the poles 21 in different directions, so that the poles 21 and the electrical connection sheet 1 maintain an effective connection, which is beneficial to the connection stability between the single cell 2 and the electrical connection sheet 1. In addition, since the recessed portion 11 is recessed in the direction of the top cover 22, the occupation of the battery pack space by the electrical connection sheet 1 can be reduced.

[0064] It should be noted that the pole 21 includes a positive pole and a negative pole, and the two fixing portions 12 of the electrical connection sheet 1 are respectively connected to the positive pole of one of the two adjacent single cells 2 and the negative pole of the other one of the two adjacent single cells 2. In the embodiment of the present application, the structure of the electrical connection sheet 1 is the same as that of the electrical connection sheet 1 in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0065] like Figure 7 As shown, in some optional embodiments of the present application, the battery pack also includes an isolation plate 23, which is arranged on the side of the top cover 22 away from the center of the single battery 2; the isolation plate 23 is provided with a mounting groove 231 at the corresponding position of the electrical connecting plate 1, and the mounting groove 231 has a bottom wall 2311 and a side wall 2312, the bottom wall 2311 is provided with a through hole 23111, the pole 21 is passed through the through hole 23111 to be connected to the electrical connecting plate 1, and the side wall 2312 is provided with one of an anti-error protrusion 23121 or an anti-error recess 131; the electrical connecting plate 1 has a peripheral wall 13, and the peripheral wall 13 is provided with the other of the anti-error protrusion 23121 or the anti-error recess 131, and the anti-error protrusion 23121 is embedded in the anti-error recess 131.

[0066] In the embodiment of the present application, since the isolation plate 23 is provided, not only the installation and positioning of the electrical connection piece 1 can be achieved, but also the electrical isolation and insulation protection inside the battery pack can be achieved. Since the side wall 2312 of the installation groove 231 is provided with one of the anti-mistake protrusions 23121 or the anti-mistake recesses 131, the peripheral wall 13 of the electrical connection piece 1 is provided with the other of the anti-mistake protrusions 23121 or the anti-mistake recesses 131. In this way, during the assembly of the electrical connection piece 1 and the pole 21, by embedding the anti-mistake protrusions 23121 in the anti-mistake recesses 131, the problem of the electrical connection piece 1 being placed upside down can be prevented, which is conducive to improving the convenience of assembly of the battery pack.

[0067] It should be noted that the embodiments of the present application do not limit the specific shapes of the error-proofing protrusion 23121 and the error-proofing recess 131, and those skilled in the art can adjust them according to actual needs. Figure 4 and Figure 7 As shown, the peripheral wall 13 of the electrical connection piece 1 is provided with two anti-error recesses 131, and the two anti-error recesses 131 are arranged along the diagonals of the electrical connection piece 1. The anti-error recesses 131 are essentially bevel structures processed on the peripheral wall 13 of the electrical connection piece 1. The side wall 2312 of the mounting groove 231 is provided with two anti-error protrusions 23121 at the corresponding positions of the two anti-error recesses 131, respectively, and one anti-error protrusion 23121 corresponds to one anti-error recess 131, so that mistakes can be effectively prevented. During the assembly process of the electrical connection piece 1 and the pole 21, the one-to-one fitting connection between the two anti-error protrusions 23121 and the anti-error recess 131 can effectively avoid the problem that the recessed portion 11 protrudes away from the top cover 22 due to the electrical connection piece 1 being placed upside down, which is beneficial to improving the assembly efficiency and assembly reliability of the battery pack.

[0068] In some optional embodiments of the present application, the pole 21 has a connection end face, which is used to connect with the fixing portion 12, and the connection end face is provided with a positioning groove; the fixing portion 12 is provided with a positioning hole 121 at a corresponding position of the positioning groove. In this way, during the assembly process of the electrical connection sheet 1 and the pole 21, the electrical connection sheet 1 can be positioned by aligning the positioning hole 121 with the positioning groove of the pole 21, which is conducive to improving the connection reliability between the electrical connection sheet 1 and the pole 21.

[0069] An embodiment of the present application also provides an electrical device, which includes the above-mentioned battery pack.

[0070] It should be noted that in the embodiment of the present application, the structure of the battery pack is the same as the structure of the battery pack in any of the above embodiments, and its beneficial effects are also similar, which will not be elaborated here.

[0071] 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0072] Although the embodiments of the present invention 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 invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electrical connecting sheet, applied to a battery pack, the battery pack comprising a single battery (2), the single battery (2) being provided with a pole (21), characterized in that: The electrical connection sheet (1) has a first direction (X) and a second direction (Y) that are perpendicular to each other, and the electrical connection sheet (1) comprises: a recessed portion (11) and two fixing portions (12); The two fixing parts (12) are arranged at intervals along the first direction (X), the fixing parts (12) are used to be connected to the pole (21), and the recessed part (11) is arranged between the two fixing parts (12) and is respectively connected to the two fixing parts (12); Along the second direction (Y), the recessed portion (11) comprises a middle region (111) and edge regions (112) located on both sides of the middle region (111); the width of the recessed portion (11) in the middle region (111) along the first direction (X) is smaller than the width of the recessed portion (11) in the edge region (112) along the first direction (X).

2. The electrical connecting sheet according to claim 1, characterized in that: Along the direction from the middle area (111) to the edge area (112), the width of the recessed portion (11) along the first direction (X) increases gradually.

3. The electrical connecting sheet according to claim 1, characterized in that: Along the direction from the middle area (111) to the edge area (112), the width of the recessed portion (11) in the middle area (111) along the first direction (X) is the same, and the width of the recessed portion (11) in the edge area (112) along the first direction (X) increases gradually.

4. The electrical connecting sheet according to claim 1, characterized in that: Along the direction from the middle area (111) to the edge area (112), the width of the recessed portion (11) in the middle area (111) along the first direction (X) increases gradually, and the width of the recessed portion (11) in the edge area (112) along the first direction (X) is the same.

5. The electrical connecting sheet according to claim 1, characterized in that: The recessed portion (11) further comprises a transition region (113); The transition area (113) is located between the middle area (111) and the edge area (112); Along the direction from the middle region (111) to the edge region (112), the width of the recessed portion (11) in the middle region (111) along the first direction (X) is the same, the width of the recessed portion (11) in the transition region (113) along the first direction (X) increases gradually, and the width of the recessed portion (11) in the edge region (112) along the first direction (X) is the same.

6. The electrical connecting sheet according to claim 1, characterized in that: The fixing portion (12) and the recessed portion (11) are an integrally formed structure.

7. The electrical connecting sheet according to claim 1, characterized in that: The electrical connection sheet (1) further comprises a third direction (Z), wherein the third direction (Z) is perpendicular to the first direction (X) and the second direction (Y); The recessed portion (11) comprises a plurality of metal sheets, the plurality of metal sheets being stacked in sequence along the third direction (Z), and the two ends of each metal sheet along the first direction (X) are respectively connected to two fixing portions (12).

8. A battery pack, characterized in that: The battery pack comprises: At least two single cells (2), at least two of the single cells (2) are arranged in sequence along the first direction (X), each of the single cells (2) comprises a top cover (22) arranged perpendicular to a third direction (Z) and a pole (21) arranged on the top cover (22), the third direction (Z) being perpendicular to the first direction (X) and the second direction (Y) respectively; And the electrical connecting piece (1) according to any one of claims 1 to 7, wherein the two fixing portions (12) are respectively connected to the poles (21) of two adjacent single batteries (2), the recessed portion (11) is located between the poles (21) of two adjacent single batteries (2), and the recessed portion (11) is recessed in the direction of the top cover (22).

9. The battery pack according to claim 8, characterized in that: The battery pack further comprises an isolation plate (23), wherein the isolation plate (23) is arranged on a side of the top cover (22) away from the center of the single battery (2); The isolation plate (23) is provided with a mounting groove (231) at a corresponding position of the electrical connection sheet (1); the mounting groove (231) has a bottom wall (2311) and a side wall (2312); the bottom wall (2311) is provided with a through hole (23111); the pole (21) is passed through the through hole (23111) to be connected to the electrical connection sheet (1); and the side wall (2312) is provided with one of an anti-error protrusion (23121) and an anti-error recess (131); The electrical connection sheet (1) has a peripheral wall (13), the peripheral wall (13) is provided with the other of the anti-error protrusion (23121) or the anti-error recess (131), and the anti-error protrusion (23121) is embedded in the anti-error recess (131).

10. An electrical device, characterized in that: The electrical equipment includes the battery pack according to claim 8 or 9.

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