Electrode connectors and batteries

Abstract

This application provides an electrode connector and a battery. The electrode connector includes a first body and a second body connected together. The first body has a first welding mark recessed therein, and the second body has a second welding mark recessed therein. The first welding mark and the second welding mark have different shapes. The first welding mark is used to indicate the end of the electrode connector used to connect to the positive electrode of the battery cell, and the second welding mark is used to indicate the end of the electrode connector used to connect to the negative electrode of the battery cell. The first welding mark and the second welding mark also serve as welding points for connecting the electrode connector to the battery cell. This design facilitates the differentiation between the end of the electrode connector connected to the positive electrode of the battery cell and the end connected to the negative electrode of the battery cell, avoiding assembly errors during the assembly and connection of the electrode connector and the battery cell, and improving the error prevention capability of the electrode connector and the safety of the battery.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an electrode connector and a battery. Background Technology

[0002] In the power battery of electric vehicles, the cells are generally connected in series and parallel through electrode connecting pieces. The design of the electrode connecting pieces carries the functions of battery system capacity, energy, operation and safety, ensuring various needs of the battery during use.

[0003] Currently, electrode connectors lack error-proofing structures. When assembling and connecting electrode connectors to battery cells, assembly equipment or operators may find it difficult to distinguish between the end of the electrode connector connected to the positive electrode and the end connected to the negative electrode, which can easily lead to assembly errors and affect battery safety. Summary of the Invention

[0004] In view of this, this application provides an electrode connector and a battery, which can improve the assembly error prevention of the electrode connector when assembling with the battery cell.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, this application provides an electrode connector, which includes a first body and a second body connected together. The first body is recessed with a first welding mark, and the second body is recessed with a second welding mark. The first welding mark and the second welding mark have different shapes. The first welding mark is used to indicate one end of the electrode connector for connection with the positive electrode of the battery cell, and the second welding mark is used to indicate one end of the electrode connector for connection with the negative electrode of the battery cell. The first welding mark and the second welding mark are also used as welding points for connecting the electrode connector to the battery cell.

[0007] In an optional embodiment, the first welding mark is in the form of a "+" and the second welding mark is in the form of a "-".

[0008] In an optional embodiment, the first body is further recessed with a plurality of first solder joint holes, and the second body is further recessed with a plurality of second solder joint holes.

[0009] In an optional embodiment, a plurality of first solder joint holes are spaced apart around the first welding mark, and a plurality of second solder joint holes are spaced apart around the second welding mark.

[0010] In an optional embodiment, the electrode connecting piece further includes a connecting portion for connecting the first body and the second body. The connecting portion has a heat dissipation hole that extends through the connecting portion along its thickness direction.

[0011] In an optional embodiment, a heat dissipation groove is recessed on the side surface of the connecting portion opposite to the first welding mark and the second welding mark.

[0012] In an optional embodiment, the connecting portion includes a raised section that is arched, such that a first side of the raised section protrudes outward relative to a first surface in the thickness direction of the first body and the second body, and a second side of the raised section is recessed relative to a second surface in the thickness direction of the first body and the second body, to form the heat dissipation groove.

[0013] In an optional embodiment, a limiting structure is provided on the side surface of the connecting portion opposite to the first welding mark and the second welding mark.

[0014] In an optional embodiment, a first positioning pin is provided on the side surface of the first body opposite to the first welding mark, and a second positioning pin is provided on the side surface of the second body opposite to the second welding mark. The first positioning pin is used to match and connect with the positive electrode of the battery cell, and the second positioning pin is used to match and connect with the negative electrode of the battery cell. The shape of the first positioning pin is different from the shape of the second positioning pin.

[0015] Secondly, this application provides a battery, the battery including the electrode connecting piece provided in any embodiment of the first aspect, and also including a plurality of battery cells, wherein any two adjacent battery cells are electrically connected through the electrode connecting piece.

[0016] The beneficial effects of the technical solution provided in this application embodiment include at least the following: by setting first welding marks and second welding marks of different shapes on the first body and the second body respectively, it is convenient to distinguish the end of the electrode connecting piece connected to the positive electrode of the battery cell and the end connected to the negative electrode of the battery cell, avoiding assembly errors when assembling the electrode connecting piece and the battery cell, and improving the error prevention of the electrode connecting piece and the safety of the battery; by setting the first welding marks and second welding marks as welding points connected to the battery cell, the welding path can be guided, which is beneficial to improving welding efficiency, and at the same time helps to improve the connection strength between the electrode connecting piece and the battery cell. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is one of the structural schematic diagrams of the electrode connecting piece provided in the embodiments of this application;

[0019] Figure 2 This is a second schematic diagram of the structure of the electrode connecting piece provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0022] Figure 5 A top view of the positive terminal of the battery cell provided in an embodiment of this application;

[0023] Figure 6 A top view of the negative terminal of the battery cell provided in an embodiment of this application;

[0024] Figure 7 This is a partial enlarged view of the battery provided in an embodiment of this application.

[0025] The reference numerals in the figure are respectively:

[0026] 1-Electrode connecting piece;

[0027] 11-First main body; 111-First welding mark; 112-First weld point hole; 113-First positioning pin; 114-First surface; 115-Second surface; 12-Second main body; 121-Second welding mark; 122-Second weld point hole; 123-Second positioning pin; 13-Connecting part; 131-Heat dissipation hole; 132-Protruding section; 133-Heat dissipation groove; 134-Limiting structure;

[0028] 2-Battery cell;

[0029] 21-Positive terminal; 211-First positioning hole; 22-Negative terminal; 221-Second positioning hole.

[0030] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The directional terms used in the embodiments of this application, such as "up," "down," and "side," are generally based on the relative relationships shown in the figures. These directional terms are used merely to more clearly describe the relationships between structures, not to describe absolute directions. When the product is placed in different orientations, the orientation may change; for example, "up" and "down" may be interchanged.

[0033] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. Some technical terms appearing in the embodiments of this application are described below.

[0034] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0035] In the power battery of electric vehicles, the cells are generally connected in series and parallel through electrode connecting pieces. The design of the electrode connecting pieces carries the functions of battery system capacity, energy, operation and safety, ensuring various needs of the battery during use.

[0036] Currently, electrode connectors lack error-proofing structures. When assembling and connecting electrode connectors to battery cells, equipment or operators may find it difficult to distinguish between the end of the electrode connector connected to the positive electrode and the end connected to the negative electrode, which can easily lead to assembly errors and affect battery safety.

[0037] To address the aforementioned technical problems, embodiments of this application provide an electrode connector and a battery.

[0038] like Figure 1 and Figure 2 As shown, the electrode connecting piece 1 provided in this embodiment includes a first body 11 and a second body 12 connected together. The first body 11 is recessed with a first welding mark 111, and the second body 12 is recessed with a second welding mark 121. The first welding mark 111 and the second welding mark 121 have different shapes. The first welding mark 111 is used to mark the end of the electrode connecting piece 1 used to connect with the positive electrode of the battery cell 2, and the second welding mark 121 is used to mark the end of the electrode connecting piece 1 used to connect with the negative electrode of the battery cell 2. The first welding mark 111 and the second welding mark 121 are also used as welding points for connecting with the battery cell 2.

[0039] like Figure 1 and Figure 2 As shown, the electrode connecting piece 1 is in the shape of a thin sheet, with the first body 11 and the second body 12 located at opposite ends along the length of the electrode connecting piece 1. The electrode connecting piece 1 is a metal part with electrical conductivity, and is used to connect two battery cells 2, thereby realizing the electrical connection between the two battery cells 2.

[0040] Specifically, such as Figure 4 As shown, the battery cell 2 has a positive terminal 21 and a negative terminal 22. A first body 11 covers the positive terminal 21 and is electrically connected to the positive terminal 21, and a second body 12 covers the negative terminal 22 and is electrically connected to the negative terminal 22.

[0041] For example Figure 3 As shown, the positive terminal 21 of each battery cell 2 is located on the same side as the negative terminal 22 of the adjacent battery cell 2. Each electrode connecting piece 1 spans two battery cells 2. The first body 11 is connected to the positive terminal 21 of one battery cell 2, and the second body 12 is connected to the negative terminal 22 of the other battery cell 2, thus realizing the electrical connection between two adjacent battery cells 2. Multiple electrode connecting pieces 1 are staggered to avoid short circuits during the assembly and soldering of multiple battery cells 2. The phrase "multiple electrode connecting pieces 1 are staggered" means: Please refer to... Figure 3 Except for the two outermost cells 2, each cell 2 is connected to two electrode connecting pieces 1. The positive terminal 21 of the cell 2 is connected to one of the electrode connecting pieces 1, thereby realizing the electrical connection between the cell 2 and the adjacent cell 2 on the first side. The negative terminal 22 of the cell 2 is connected to the other electrode connecting piece 1, thereby realizing the electrical connection between the cell 2 and the adjacent cell 2 on the second side. The multiple electrode connecting pieces 1 are staggered along the arrangement direction of the multiple cells 2.

[0042] like Figure 1 and Figure 2 As shown, the upper surfaces of the first body 11 and the second body 12 are designated as the first surface 114, and the lower surfaces of the first body 11 and the second body 12 are designated as the second surface 115. The first welding mark 111 is recessed relative to the first surface 114 of the first body 11, and the second welding mark 121 is recessed relative to the first surface 114 of the second body 12. This not only facilitates visual identification but also provides a position for welding the electrode connecting piece 1 to the battery cell 2. The electrode connecting piece 1 and the battery cell 2 are connected by welding methods such as laser welding.

[0043] The depth of the first welding mark 111 and the second welding mark 121 can be set according to actual needs. For example, the depth of the first welding mark 111 and the second welding mark 121 is 50% of the thickness of the first body 11 or the second body 12.

[0044] The shapes of the first welding mark 111 and the second welding mark 121 can be geometric shapes, Chinese characters, letters, symbols, etc. By setting the shapes of the first welding mark 111 and the second welding mark 121 to be different, it is convenient to distinguish the two ends of the electrode connecting piece 1, so that the two ends of the electrode connecting piece 1 are correspondingly matched with the positive terminal 21 and the negative terminal 22 of the battery cell 2, realizing the error prevention function of welding and assembling the electrode connecting piece 1 and the battery cell 2, which is conducive to improving the positioning effect and assembly efficiency of the electrode connecting piece 1 and the battery cell 2.

[0045] The electrode connecting piece 1 provided in this application embodiment has a first welding mark 111 and a second welding mark 121 of different shapes respectively set on the first body 11 and the second body 12. This makes it easy to distinguish the end of the electrode connecting piece 1 that is connected to the positive electrode of the battery cell 2 and the end that is connected to the negative electrode of the battery cell 2, avoiding assembly errors when assembling the electrode connecting piece 1 and the battery cell 2, and improving the error prevention of the electrode connecting piece 1 and the safety of the battery. By setting the first welding mark 111 and the second welding mark 121 as the welding point for connecting to the battery cell 2, the welding path can be guided, which is beneficial to improving welding efficiency and also helps to improve the connection strength between the electrode connecting piece 1 and the battery cell 2.

[0046] In a further embodiment, such as Figure 1 As shown, the first welding mark 111 is in the shape of a "+", and the second welding mark 121 is in the shape of a "-".

[0047] By setting the shapes of the first welding mark 111 and the second welding mark 121 as positive and negative pole symbols, it is not only simple and clear and easy to distinguish, but also more intuitive to show which pole of the battery cell 2 each end of the electrode connecting piece 1 is connected to. This makes it convenient for assembly equipment or operators to connect the electrode connecting piece 1 to the battery cell 2 accordingly, thus demonstrating the error prevention function of the electrode connecting piece 1.

[0048] In one embodiment, the first body 11 is further recessed with a plurality of first solder joint holes 112, and the second body 12 is further recessed with a plurality of second solder joint holes 122.

[0049] The first solder joint hole 112 and the second solder joint hole 122 are both solder joints when the electrode connecting piece 1 is connected to the battery cell 2. When assembling the electrode connecting piece 1 and the battery cell 2, welding is performed in the first solder joint hole 112 and the second solder joint hole 122.

[0050] The first solder joint hole 112 and the second solder joint hole 122 can be through holes penetrating the electrode connecting piece 1, or they can be blind holes not penetrating the electrode connecting piece 1. For example Figure 1 and Figure 2As shown, neither the first solder joint hole 112 nor the second solder joint hole 122 penetrates the electrode connecting piece 1 in the thickness direction, and both the first solder joint hole 112 and the second solder joint hole 122 are blind holes.

[0051] By setting multiple first solder joint holes 112 and multiple second solder joint holes 122, the connection tightness between the electrode connecting piece 1 and the battery cell 2 is further improved, preventing the electrical connection between multiple battery cells 2 from being affected due to the electrode connecting piece 1 detaching from the battery cell 2.

[0052] Furthermore, a plurality of first weld point holes 112 are spaced apart around the first weld mark 111, and a plurality of second weld point holes 122 are spaced apart around the second weld mark 121.

[0053] like Figure 1 As shown, there are eight first solder joint holes 112, which are distributed at intervals around the outer periphery of the first welding mark 111; there are twelve second solder joint holes 122, which are distributed at intervals around the outer periphery of the second welding mark 121.

[0054] This setting improves the connection strength between the area where the first welding mark 111 is located and the area where the second welding mark 121 is located and the battery cell 2, and enhances the tightness of the connection between the electrode connecting piece 1 and the battery cell 2.

[0055] In one embodiment, the electrode connecting piece 1 further includes a connecting portion 13, which is used to connect the first body 11 and the second body 12. The connecting portion 13 has a heat dissipation hole 131 that extends through the connecting portion 13 along its thickness direction.

[0056] like Figure 1 As shown, the connecting part 13 is located between the first body 11 and the second body 12. One end of the connecting part 13 is connected to the first body 11, and the other end is connected to the second body 12. Optionally, the electrode connecting piece 1 is an integral structure, with the first body 11, the connecting part 13, and the second body 12 integrally connected.

[0057] The heat dissipation hole 131 is a through hole provided on the connecting part 13. The heat dissipation hole 131 can increase the contact area between the electrode connecting piece 1 and the air, thereby increasing the heat dissipation area of ​​the electrode connecting piece 1, improving the heat dissipation capacity of the electrode connecting piece 1, and preventing the battery cell 2 from thermal runaway due to overheating.

[0058] The number of heat dissipation holes 131 can be one or more. For example Figure 1 As shown, there are three heat dissipation holes 131, which are distributed at intervals along the width direction of the electrode connecting piece 1.

[0059] The shape of the heat dissipation hole 131 can be circular, rectangular, elliptical, oval, or other shapes. For example... Figure 1 As shown, the heat dissipation hole 131 is oval in shape and extends along the length direction of the electrode connecting piece 1.

[0060] Furthermore, a heat dissipation groove 133 is recessed on the side of the connecting part 13 opposite to the first welding mark 111 and the second welding mark 121.

[0061] Among them, the surface of the connecting portion 13 that faces away from the first welding mark 111 and the second welding mark 121 is the surface connected to the second surface 115, for example... Figure 1 As shown, the heat dissipation groove 133 is recessed in the direction of the first surface 114.

[0062] In this embodiment, by setting the heat dissipation groove 133, after the electrode connecting piece 1 and the battery cell 2 are assembled, a gap can be formed between the connecting part 13 and the surface of the battery cell 2, so that air can flow in the gap, increasing the contact area between the electrode connecting piece 1 and the air, and further improving the heat dissipation capacity of the electrode connecting piece 1.

[0063] In an optional embodiment, the heat dissipation groove 133 is a groove formed by processes such as drilling, milling, stamping, and laser cutting, which removes a portion of the material of the connecting part 13, thus helping to reduce the weight and volume of the electrode connecting piece 1.

[0064] In another alternative embodiment, the connecting portion 13 includes a protruding section 132, which is arched so that a first side of the protruding section 132 protrudes outward relative to a first surface 114 in the thickness direction of the first body 11 and the second body 12, and a second side of the protruding section 132 is recessed relative to a second surface 115 in the thickness direction of the first body 11 and the second body 12, to form a heat dissipation groove 133.

[0065] In this embodiment, such as Figure 1 As shown, the heat dissipation groove 133 is formed by the upward bending of the protruding section 132, which does not require additional cutting processing, reducing the processing time of the electrode connecting piece 1 and improving the production efficiency of the electrode connecting piece 1.

[0066] like Figure 1 As shown, the protruding section 132 is located in the middle region of the electrode connecting piece 1. The protruding section 132 is arched and not only protrudes upward relative to the first surface 114, but also is concave upward relative to the second surface 115. A heat dissipation groove 133 extending along the width direction of the electrode connecting piece 1 is formed on the lower surface of the protruding section 132, which improves the heat dissipation capacity of the electrode connecting piece 1.

[0067] In one embodiment, a limiting structure 134 is provided on the side surface of the connecting portion 13 opposite to the first welding mark 111 and the second welding mark 121.

[0068] like Figure 1 As shown, the limiting structure 134 is located on the lower side of the connecting portion 13, and the limiting structure 134 protrudes outward relative to the second surface 115 of the first body 11 and the second body 12.

[0069] like Figure 7 As shown, after the electrode connecting piece 1 and the battery cell 2 are assembled, the limiting structure 134 abuts against the positive terminal 21 of one of the battery cells 2 on one side of the electrode connecting piece 1 along its length direction, and abuts against the negative terminal 22 of the other battery cell 2 on the other side of the limiting structure 134 along its length direction. Under the action of the limiting structure 134, the electrode connecting piece 1 is difficult to move along its own length direction, which not only facilitates positioning when assembling the electrode connecting piece 1 and the battery cell 2, but also improves the stability of the electrode connecting piece 1 after assembly.

[0070] In one embodiment, a first positioning pin 113 is protruding on the side surface of the first body 11 opposite to the first welding mark 111, and a second positioning pin 123 is protruding on the side surface of the second body 12 opposite to the second welding mark 121. The first positioning pin 113 is used to match and connect with the positive electrode of the battery cell 2, and the second positioning pin 123 is used to match and connect with the negative electrode of the battery cell 2. The shape of the first positioning pin 113 is different from the shape of the second positioning pin 123.

[0071] like Figure 2 As shown, the first positioning pin 113 protrudes from the second surface 115 of the first body 11, and the second positioning pin 123 protrudes from the second surface 115 of the second body 12. Figure 5 and Figure 6 As shown, the positive terminal 21 of the battery cell 2 has a first positioning hole 211, and the negative terminal 22 of the battery cell 2 has a second positioning hole 221. The first positioning pin 113 is adapted to be inserted into the first positioning hole 211, and the second positioning pin 123 is adapted to be inserted into the second positioning hole 221, thereby realizing the assembly positioning between the electrode connecting piece 1 and the battery cell 2, and at the same time limiting the electrode connecting piece 1 to a certain extent.

[0072] The shape and size of the first positioning pin 113 are adapted to the shape and size of the first positioning hole 211, and the shape and size of the second positioning pin 123 are adapted to the shape and size of the second positioning hole 221, which helps to improve the positioning accuracy of the electrode connecting piece 1 and the battery cell 2.

[0073] like Figure 2As shown, the first locating pin 113 is hemispherical with a circular cross-section; the second locating pin 123 is cuboid with a rectangular cross-section. Correspondingly, as... Figure 5 and 6 As shown, the first positioning hole 211 is a round hole, and the second positioning hole 221 is a rectangular hole.

[0074] Optionally, the number of the first positioning pin 113, the second positioning pin 123, the first positioning hole 211, and the second positioning hole 221 may be one or more, for example... Figure 2 , Figure 5 and Figure 6 As shown, there are four first positioning pins 113 and four first positioning holes 211, and there are also four second positioning pins 123 and four second positioning holes 221.

[0075] By setting the shape of the first positioning pin 113 to be different from that of the second positioning pin 123, the first positioning pin 113 is difficult to be adapted to the second positioning hole 221 and the second positioning pin 123 is difficult to be adapted to the first positioning hole 211, which further improves the error prevention of the installation of the electrode connecting piece 1 and greatly reduces the possibility of incorrect assembly of the positive and negative electrodes of the electrode connecting piece 1 and the battery cell 2.

[0076] like Figures 3 to 7 As shown, this application embodiment also provides a battery, which includes the electrode connecting piece 1 provided in any of the above embodiments, and also includes a plurality of battery cells 2, wherein any two adjacent battery cells 2 are electrically connected through the electrode connecting piece 1.

[0077] Specifically, the battery cell 2 has a positive terminal 21 and a negative terminal 22. A first body 11 covers the positive terminal 21 and is electrically connected to the positive terminal 21, and a second body 12 covers the negative terminal 22 and is electrically connected to the negative terminal 22.

[0078] For example Figure 3 As shown, the positive terminal 21 of each battery cell 2 is located on the same side as the negative terminal 22 of the adjacent battery cell 2. Each electrode connecting piece 1 spans two battery cells 2. The first body 11 is connected to the positive terminal 21 of one battery cell 2, and the second body 12 is connected to the negative terminal 22 of the other battery cell 2, thus realizing the electrical connection between two adjacent battery cells 2. Multiple electrode connecting pieces 1 are staggered to avoid short circuits during the assembly and soldering of multiple battery cells 2. The phrase "multiple electrode connecting pieces 1 are staggered" means: Please refer to... Figure 3Except for the two outermost cells 2, each cell 2 is connected to two electrode connecting pieces 1. The positive terminal 21 of the cell 2 is connected to one of the electrode connecting pieces 1, thereby realizing the electrical connection between the cell 2 and the adjacent cell 2 on the first side. The negative terminal 22 of the cell 2 is connected to the other electrode connecting piece 1, thereby realizing the electrical connection between the cell 2 and the adjacent cell 2 on the second side. The multiple electrode connecting pieces 1 are staggered along the arrangement direction of the multiple cells 2.

[0079] In a further embodiment, a first positioning pin 113 is protruding on the side surface of the first body 11 opposite to the first welding mark 111, and a second positioning pin 123 is protruding on the side surface of the second body 12 opposite to the second welding mark 121. The first positioning pin 113 is used to match and connect with the positive electrode of the battery cell 2, and the second positioning pin 123 is used to match and connect with the negative electrode of the battery cell 2. The shape of the first positioning pin 113 is different from the shape of the second positioning pin 123.

[0080] like Figure 5 and Figure 6 As shown, the positive terminal 21 of the battery cell 2 has a first positioning hole 211, and the negative terminal 22 of the battery cell 2 has a second positioning hole 221. The first positioning pin 113 is adapted to be inserted into the first positioning hole 211, and the second positioning pin 123 is adapted to be inserted into the second positioning hole 221, thereby realizing the assembly positioning between the electrode connecting piece 1 and the battery cell 2, and at the same time limiting the electrode connecting piece 1 to a certain extent.

[0081] like Figure 2 As shown, the first locating pin 113 is hemispherical with a circular cross-section; the second locating pin 123 is cuboid with a rectangular cross-section. Correspondingly, as... Figure 5 and Figure 6 As shown, the first positioning hole 211 is a round hole, and the second positioning hole 221 is a rectangular hole.

[0082] Optionally, the number of the first positioning pin 113, the second positioning pin 123, the first positioning hole 211, and the second positioning hole 221 may be one or more, for example... Figure 2 , Figure 5 and Figure 6 As shown, there are four first positioning pins 113 and four first positioning holes 211, and there are also four second positioning pins 123 and four second positioning holes 221.

[0083] By setting the shape of the first positioning pin 113 to be different from that of the second positioning pin 123, the first positioning pin 113 is difficult to be adapted to the second positioning hole 221 and the second positioning pin 123 is difficult to be adapted to the first positioning hole 211, which further improves the error prevention of the installation of the electrode connecting piece 1 and greatly reduces the possibility of incorrect assembly of the positive and negative electrodes of the electrode connecting piece 1 and the battery cell 2.

[0084] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0085] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0086] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An electrode connecting piece (1), characterized in that, The electrode connecting piece (1) includes a first body (11) and a second body (12) connected together. The first body (11) is recessed with a first welding mark (111), and the second body (12) is recessed with a second welding mark (121). The first welding mark (111) and the second welding mark (121) have different shapes. The first welding mark (111) is used to mark one end of the electrode connecting piece (1) used to connect with the positive electrode of the battery cell (2), and the second welding mark (121) is used to mark one end of the electrode connecting piece (1) used to connect with the negative electrode of the battery cell (2). The first welding mark (111) and the second welding mark (121) are also used as welding points for connecting the electrode connecting piece (1) and the battery cell (2). The first welding mark (111) is in the shape of a "+", and the second welding mark (121) is in the shape of a "-". The electrode connecting piece (1) further includes a connecting part (13), which is used to connect the first body (11) and the second body (12). The connecting part (13) has a heat dissipation hole (131) which penetrates the connecting part (13) along the thickness direction of the connecting part (13). The connecting portion (13) has a heat dissipation groove (133) recessed on one side surface away from the first welding mark (111) and the second welding mark (121); the connecting portion (13) includes a protruding section (132), the protruding section (132) is arched, so that the first side of the protruding section (132) protrudes outward relative to the first surface (114) in the thickness direction of the first body (11) and the second body (12), and the second side of the protruding section (132) is recessed relative to the second surface (115) in the thickness direction of the first body (11) and the second body (12), so as to form the heat dissipation groove (133); The first main body (11) has a first positioning pin (113) protruding on the side surface opposite to the first welding mark (111), and the second main body (12) has a second positioning pin (123) protruding on the side surface opposite to the second welding mark (121). The first positioning pin (113) is used to match and connect with the positive electrode of the battery cell (2), and the second positioning pin (123) is used to match and connect with the negative electrode of the battery cell (2). The shape of the first positioning pin (113) is different from the shape of the second positioning pin (123).

2. The electrode connecting piece (1) according to claim 1, characterized in that, The first body (11) is further recessed with a plurality of first solder joint holes (112), and the second body (12) is further recessed with a plurality of second solder joint holes (122).

3. The electrode connecting piece (1) according to claim 2, characterized in that, A plurality of first solder joint holes (112) are spaced apart around the first welding mark (111), and a plurality of second solder joint holes (122) are spaced apart around the second welding mark (121).

4. The electrode connecting piece (1) according to claim 1, characterized in that, The connecting part (13) has a limiting structure (134) protruding on the side surface opposite to the first welding mark (111) and the second welding mark (121).

5. A battery, characterized in that, The battery includes an electrode connecting piece (1) as described in any one of claims 1 to 4, and also includes a plurality of battery cells (2), wherein any two adjacent battery cells (2) are electrically connected through the electrode connecting piece (1).

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