Battery module and electric equipment

Abstract

The invention discloses a battery module and electric equipment, and belongs to the technical field of batteries, the battery module comprises a plurality of battery cells, each battery cell comprises a convex end and a flat end which are oppositely arranged along the height direction of the battery module, the flat end is one of a positive electrode and a negative electrode, and the convex end is the other one of the positive electrode and the negative electrode; the bracket is used for mounting the battery cells, so that the end surface of the flat end of one battery cell and the end surface of the convex end of the other battery cell are coplanar with the first mounting plane; and the busbar is respectively connected with the end surface of the flat end of one battery cell positioned on the first mounting plane and the end surface of the convex end of the other battery cell positioned on the first mounting plane. According to the technical scheme, the end face of the flat end of one battery cell and the end face of the convex end of the other battery cell are positioned on the first mounting plane, so that the busbar for connecting the two battery cells can be arranged to be of a plane structure, and compared with the scheme of adopting a step-shaped busbar in the related technology, the step stamping process is omitted, the production efficiency is improved, and the production cost is reduced. And the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery module and an electrical device. Background Technology

[0002] Battery modules typically include multiple cells placed side-by-side, with the same busbar connecting the positive terminal of one cell and the negative terminal of another. For example, the positive terminal of one cell is connected to the surface of the busbar facing the busbar, and the negative terminal of another cell is connected to the surface of the busbar facing the busbar, respectively. However, due to the height difference between the positive and negative terminals facing the busbar, in order to better connect the busbar to the positive and negative output terminals of the two cells, related technologies have used a stepped shape to create a height difference between the portion of the busbar connecting the positive terminal and the portion connecting the negative terminal. This allows for better matching of the positive and negative terminals, facilitating the welding of the busbar to the cell.

[0003] However, the stepped busbar structure is complex to manufacture and has high mold costs. Summary of the Invention

[0004] This application provides a battery module and an electrical device to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a battery module is provided, comprising: a battery cell, wherein there are multiple battery cells, each battery cell including a protruding end and a flat end disposed opposite to each other along the height direction of the battery module, wherein the flat end is one of a positive electrode and a negative electrode, and the protruding end is the other of a positive electrode and a negative electrode; A bracket for mounting the battery cells such that the end face of the flat end of one battery cell and the end face of the convex end of another battery cell are both coplanar with a first mounting plane; and The busbar is connected to the end face of the flat end of one of the battery cells and the end face of the convex end of the other battery cell, respectively, located on the first mounting plane.

[0006] The battery module in this embodiment includes multiple battery cells, which are electrically connected by a busbar. The bracket allows the flat end face of one battery cell and the convex end face of another battery cell to be located on a first mounting plane. That is, in this embodiment, there is no height difference between the surface of the positive electrode facing the busbar and the surface of the negative electrode facing the busbar, thus ensuring that the connection points between the busbar and the flat end face, and between the busbar and the convex end face, are on the same plane. In this embodiment, by locating the flat end face of one battery cell and the convex end face of another battery cell on the first mounting plane, the busbar connecting the two cells can be configured as a planar structure. Compared to the stepped busbar scheme in related technologies, this saves the stamping step process, improves production efficiency, and reduces production costs.

[0007] Optionally, multiple battery cells form multiple battery cell groups. Each battery cell group includes multiple battery cells arranged along a first direction, and the protruding ends of the multiple battery cells are located at the same end in the height direction of the battery module. The multiple battery cell groups are arranged along a second direction, and the first direction and the second direction form an angle. In any two adjacent battery cell groups, the flat end of one battery cell group and the protruding end of another battery cell group are located at the same end in the height direction of the battery module. There are multiple busbars, and the two ends in the height direction of the battery module are respectively provided with busbars.

[0008] Compared to related technologies where all busbars are located at one end of the battery module, the embodiment of this application provides busbars at both ends of the battery module in the height direction. This allows for the distribution of busbars at both ends of the battery module's height direction while maintaining the same number of batteries, resulting in a larger installation area for the busbars. Consequently, the busbars can also have a larger current-carrying area.

[0009] Optionally, one of the busbars is connected to a plurality of the cells in one of the cell groups.

[0010] A bus can be used to connect all the cells in a single cell group. Alternatively, a bus can connect two adjacent cell groups, and can connect all the cells in one cell group as well as all the cells in another cell group.

[0011] Optionally, the busbar includes a first busbar sub-section and a second busbar sub-section connected to each other. In two adjacent battery cell groups, the first busbar sub-section is used to connect multiple battery cells of one battery cell group, and the second busbar sub-section is used to connect multiple battery cells of the other battery cell group.

[0012] This configuration allows multiple cells from two adjacent cell groups to be connected using a single bus. This reduces the number of buses required and increases the current-carrying area of ​​a single bus.

[0013] Optionally, the bracket is provided with a groove, the groove including a bottom wall and a side wall connected to each other, the bottom wall and the side wall forming an inner space, the busbar is installed in the inner space, the bottom wall of the groove is provided with a first mounting through hole, the protruding end is provided in the first mounting through hole and connected to the busbar.

[0014] To facilitate the installation of the busbar, a groove is provided in the bracket. The side wall of the groove facilitates the positioning of the busbar, and the bottom wall of the groove is provided with a first mounting through hole, so that the busbar installed in the groove space can be connected to the protrusion located in the first mounting through hole.

[0015] Optionally, the battery cell includes a housing and a terminal post, the housing and the terminal post having a potential difference, the housing including a shell wall disposed opposite to each other along the height direction of the battery module and a flat end, the terminal post including a convex end, the convex end protruding outward relative to the shell wall in the height direction of the battery module, and a portion of the bottom wall of the tank located between the shell wall and the busbar.

[0016] In this embodiment, part of the bottom wall of the tank is located between the shell wall and the busbar, which can isolate or even insulate the shell wall and the busbar. This makes it less likely for the busbar to come into contact with the shell wall and short-circuit when connected to the convex end.

[0017] Optionally, a portion of the bottom wall of the groove abuts against the shell wall, such that the end face of the protrusion is coplanar with the first mounting plane.

[0018] When a battery cell is installed on a bracket, the shell wall abuts against the bottom wall of the tank, and the protruding end passes through the through hole. The position of the protruding end face of the battery cell can be controlled by adjusting the shell wall.

[0019] Optionally, the bottom wall of the tank is provided with a second mounting through hole, and the flat end is provided in the second mounting through hole and connected to the busbar.

[0020] When a battery cell is installed on the bracket, its flat end passes through the second mounting through hole and can be connected to the busbar.

[0021] Optionally, the bracket further includes a first limiting block, which is connected to the side wall of the groove. The first limiting block includes a first surface facing the battery cell. Along the height direction of the battery module, the first surface partially blocks the second mounting through hole, and the first surface is coplanar with the first mounting plane. With this configuration, when the flat end of the battery cell is mounted in the second mounting through hole, the first surface limits the mounting of the flat end, ensuring that the end face of the flat end of the battery cell (i.e., the end face of the flat end of the battery cell facing away from the convex end of the battery cell) is coplanar with the first mounting plane. This achieves that the end face of the flat end of one battery cell and the end face of the convex end of another battery cell are both coplanar with the first mounting plane.

[0022] The first limiting block includes a second surface facing the busbar, the second surface being used to limit the busbar.

[0023] The first limiting block includes a second surface facing the busbar, which is used to limit the busbar. The first limiting block can limit the busbar, so that the busbar is stably installed in the slot space.

[0024] Optionally, the drain outlet is provided with a mating hole, and the bracket further includes a second limiting block. The second limiting block is installed on the side of the bottom wall of the tank facing the space inside the tank and is installed in the mating hole. The second limiting block is spaced apart from the first limiting block.

[0025] The engagement of the second limiting block with the mating hole allows for more accurate installation of the busbar in the correct position within the tank. Furthermore, the engagement of the first and second limiting blocks provides support for the battery cell, enabling its installation within the internal space created by the bracket.

[0026] Optionally, the surface of the second limiting block facing the battery cell is coplanar with the first mounting plane.

[0027] This makes it easy to ensure that the positions of the busbar and the flat end face connection, and the positions of the busbar and the convex end face connection, are on the same plane.

[0028] Optionally, the bracket further includes an annular wall, which is connected to the side of the bottom wall of the tank away from the space inside the tank, and the annular wall is arranged around the outer periphery of the battery cell.

[0029] The ring wall can be encircled on the outer periphery of the battery cell, separating the battery cell from other battery cells. This can prevent direct contact between the outer shells of adjacent battery cells, making it safer and preventing short circuits.

[0030] According to a second aspect of this application, an electrical device is provided, including the battery module described above.

[0031] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description 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 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.

[0032] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0033] Figure 1 This is a perspective view of the battery module provided in an exemplary embodiment of this disclosure; Figure 2 This is a top view of the battery module provided in an exemplary embodiment of this disclosure; Figure 3 This is a cross-sectional view of the battery module provided in an exemplary embodiment of this disclosure; Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle; Figure 5 This is a partial exploded view of the battery module provided in an exemplary embodiment of this disclosure; Figure 6 This is a schematic diagram of the structure of the bracket provided in an exemplary embodiment of this disclosure; Figure 7 This is a schematic diagram of the structure of the battery cell provided in an exemplary embodiment of this disclosure; Figure 8 This is a block diagram of an electrical device provided in an exemplary embodiment of this disclosure.

[0034] Explanation of reference numerals in the attached figures: 1. Battery module; 11. Battery cell; 110. Battery cell assembly; x, first direction; y, second direction; 112. Casing; 1121. Casing wall; 113. Flat end; 114. Pole post; 111. Convex end; 12. Bracket; 121. Tank; 122. Bottom wall of tank; 125. First mounting through hole; 126. Second mounting through hole; 127. Annular wall; 128. First limiting block; 1281. First surface; 1282. Second surface; 129. Second limiting block; 123. Tank sidewall; 124. Tank interior space; 13. Busbar; 130. First busbar sub-section; 134. Mating hole; 132. Second busbar sub-section; 2. Electrical equipment. Detailed Implementation

[0035] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0036] Firstly, a battery module 1 is provided, please refer to... Figure 1 The battery module 1 includes battery cells 11, a bracket 12, and a busbar 13. There are multiple battery cells 11, which can be placed side-by-side. Please refer to... Figure 7 Each battery cell 11 includes a protruding end 111 and a flat end 113 disposed opposite each other along the height direction of the battery module 1. The battery cell 11 has a positive electrode and a negative electrode, with the flat end 113 being one of the positive and negative electrodes, and the protruding end 111 being the other. In some examples, the flat end 113 is the positive electrode and the protruding end 111 is the negative electrode. In other examples, the flat end 113 is the negative electrode and the protruding end 111 is the positive electrode.

[0037] Busbar 13 is connected to the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 located on the first mounting plane.

[0038] The battery module 1 in this embodiment includes multiple battery cells 11, which are electrically connected by a busbar 13. The bracket 12 allows the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 to be located on a first mounting plane. That is, in this embodiment, there is no height difference between the surface of the positive electrode facing the busbar and the surface of the negative electrode facing the busbar. This ensures that the connection points between the busbar 13 and the flat end 113, and between the busbar 13 and the convex end 111, are on the same plane. In this embodiment, by placing the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 on the first mounting plane, the busbar 13 connecting the two battery cells 11 can be configured as a planar structure. Compared to the stepped busbar 13 used in related technologies, this saves the stamping step process, improves production efficiency, and reduces production costs.

[0039] In some embodiments, the bus 13 can be a single-layer conductive sheet structure. In some examples, the bus 13 can be a planar copper or nickel conductor structure. In some examples, the bus 13 can be fixed to the negative terminal 114 of the battery cell 11 by welding. The welding method can be laser welding or ultrasonic welding. In some examples, during welding, the bus 13 can be directly laid on the battery cell assembly 110, and the multiple battery cells 11 can be electrically connected by laser welding.

[0040] To facilitate welding or positioning, the busbar 13 may have multiple openings. A busbar 13 can be connected and aligned for welding to the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11, which are coplanar with the first mounting plane, through the multiple openings.

[0041] The end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 are coplanar with the first mounting plane. Specifically, the end face of the flat end 113 of one battery cell 11 facing away from its convex end 111 and the end face of the convex end 111 of another battery cell 11 facing away from its flat end 113 are located on the same plane and are both located on the first mounting plane.

[0042] It is easy to understand that the convex end 111 and the flat end 113 are the two opposite ends of the cell 11 along the axial direction. Thus, at one end of the battery module 1, there are multiple flat ends 113 and convex ends 111 of the cell 11, and at the opposite end of the battery module 1, there are also multiple flat ends 113 and convex ends 111 of the cell 11.

[0043] During module assembly, the battery cells 11 need to be fixed by brackets 12, which can be used to fix multiple battery cells 11. The positive and negative terminals are electrically connected via busbar 13. The brackets 12 are used to mount the battery cells 11 such that the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 are both coplanar with the first mounting plane. In some examples, there can be multiple brackets 12; for example, there can be two brackets 12, and the two brackets 12 can be detachably connected, such as by plug-in, screw-in, or snap-fit.

[0044] A bracket 12 is disposed at one end of the battery module 1 for mounting the flat ends 113 and convex ends 111 of a plurality of battery cells 11 at that position. Another bracket 12 is disposed at the opposite end of the battery module 1 for mounting the flat ends 113 and convex ends 111 of a plurality of battery cells 11 at that position.

[0045] In some examples, the end faces of the flat ends 113 and the convex ends 111 of all the cells mounted in one bracket are located in the same plane, and the end faces of the flat ends 113 and the convex ends 111 of all the cells mounted in another bracket are located in the same plane. Figure 3 The positions of the first and second mounting planes are indicated by dashed lines. Figure 4The position of the first mounting plane is indicated by a dashed line. It can be seen that among the multiple battery cells 11 mounted on one bracket 12, the end face of the flat end 113 of one battery cell 11 is coplanar with the end face of the convex end 111 of another battery cell 11. For clarity, this plane is defined as the first mounting plane. Similarly, among the multiple battery cells 11 mounted on another bracket 12, the end face of the flat end 113 of one battery cell 11 is coplanar with the end face of the convex end 111 of another battery cell 11. For clarity, this plane is defined as the second mounting plane. The first and second mounting planes are simply used to represent two different planes defining the battery cell mounting positions of the two brackets. The brackets can be injection molded.

[0046] In this application, the specific description will focus on the cooperation relationship between one of the brackets 12 and the battery cell 11, where the plane defined by the bracket is the first mounting plane. The plane defined by the other bracket is the aforementioned second mounting plane. The functions and implementation methods of the other bracket 12 can be referred to the bracket 12 described above.

[0047] Multiple cells 11 specifically refers to two or more cells 11, such as two, three, or four. Multiple cells 11 can be connected in series, in parallel, or a combination of both.

[0048] Please combine Figure 1 In battery module 1, multiple battery cells 11 are arranged in an array, forming multiple cell groups 110. Each cell group 110 includes multiple battery cells 11 arranged along a first direction x, and the protruding ends 111 of the multiple battery cells 11 are located at the same end in the height direction of battery module 1. It is easily understood that the flat ends 113 of these battery cells 11 are also located at the same end in the height direction of battery module 1. Please refer to... Figure 2 , Figure 2 The approximate location of a group of battery cells 110 is outlined by a dashed line, which indicates that the flat end 113 of the group of battery cells 110 is located at the same end in the height direction of the battery module 1.

[0049] Multiple battery cell groups 110 are arranged along the second direction y. The first direction x and the second direction y have an angle between them, and the angle between the first direction x and the second direction y can be ninety degrees.

[0050] Please combine Figure 2 In some examples, the first direction x can be the width direction of battery module 1, and the second direction y can be the length direction of battery module 1.

[0051] In some other examples, the first direction x can be the length direction of battery module 1, and the second direction y can be the width direction of battery module 1.

[0052] The following description uses the first direction x as the width direction of the battery module 1 and the second direction y as the length direction of the battery module 1 as an example. Each cell group 110 may include five cells 11 arranged along the first direction x. The protruding ends 111 of the five cells 11 are located at the same end of the battery module 1. It is easy to understand that the flat ends 113 of the five cells 11 are located at the same end of the battery module 1. Seven cell groups 110 are arranged along the second direction y. It is easy to understand that there are seven cells 11 along the second direction y.

[0053] Please combine Figure 5 Along the second direction, in any two adjacent cell groups 110, the flat end 113 of one cell group 110 and the convex end 111 of the other cell group 110 are located at the same end in the height direction of the battery module 1. In some examples, in any two adjacent cell groups 110, the flat end 113 of one cell group 110 may be on top and the convex end 111 may be on the bottom. The flat end 113 of the other cell group 110 may be on the bottom and the convex end 111 may be on top.

[0054] For example, please combine Figure 5 Along the second direction y, from left to right, the sequence is: convex end 111 - flat end 113 - convex end 111 - flat end 113 - convex end 111 - flat end 113 - convex end 111, thereby achieving that in any two adjacent cell groups 110, the flat end 113 of one cell group 110 and the convex end 111 of the other cell group 110 are located at the same end of the battery module 1.

[0055] Please combine Figure 3 Multiple busbars 13 are provided, with one busbar 13 at each end along the height direction of the battery module 1. The height direction of the battery module 1 is the axial direction of the battery cell 11. Thus, compared to related technologies where all busbars 13 are located at one end of the battery module 1, this embodiment provides busbars 13 at both ends along the height direction of the battery module 1. Therefore, with the same number of batteries, the busbars can be distributed at both ends along the height direction of the battery module 1, allowing the busbars 13 to have a larger installation area. This also allows the busbars 13 to have a larger current-carrying area.

[0056] Please combine Figure 2 A bus 13 is used to connect to a plurality of cells 11 in a cell pack 110.

[0057] A bus 13 can be used to connect multiple cells 11 in a cell group 110. In some examples, a bus 13 can be used to connect five cells 11 in a cell group 110.

[0058] Bus 13 may be used solely to connect all the cells 11 in a single cell group 110. Bus 13 may also be capable of connecting two adjacent cell groups 110, and connecting all the cells 11 in one cell group 110 as well as all the cells 11 in another cell group 110. This application does not impose any limitations on this.

[0059] Please combine Figure 4 Bus 13 includes a first bus sub-section 130 and a second bus sub-section 132 connected to each other. In two adjacent battery cell groups 110, the first bus sub-section 130 is used to connect multiple battery cells 11 of one battery cell group 110, and the second bus sub-section 132 is used to connect multiple battery cells 11 of another battery cell group 110.

[0060] This configuration allows all the cells 11 of two adjacent cell groups 110 to be connected using a single bus 13. This reduces the number of bus 13s and increases the current-carrying area of ​​a single bus 13.

[0061] In some scenarios, the battery cells in the battery module 1 of this application are medium or small unipolar steel-cased cells, with a cell diameter ranging from 0mm to 30mm. For example, it could be a 26105 model battery: a cylindrical battery with a diameter of 26mm and a height of 105mm. It could also be a 26700 model battery: a cylindrical battery with a diameter of 26mm and a height of 70mm. It is easy to understand that for medium or small unipolar steel-cased cells, the welding positions to the busbars are the convex end face and the flat end face, resulting in a small weldable surface area. If all the busbars are connected to one end of the battery module, it increases the operational difficulty, and the current-carrying area of ​​a single busbar will also be small. In this application embodiment, since busbars are provided at both ends of the battery module in the height direction, fewer busbars can be distributed at one end of the battery module's height, allowing for a certain spacing between the busbars and facilitating welding operations. Simultaneously, it also allows a larger current-carrying area for a single busbar.

[0062] In some examples, please combine Figure 1 and Figure 5There can be eight busbars 13, with four busbars 13 respectively arranged at both ends along the height direction of the battery module. Specifically, the eight cell groups 110 may include a first cell group, a second cell group, a third cell group, a fourth cell group, a fifth cell group, a sixth cell group, and a seventh cell group arranged from left to right. At one end of the battery module 1 in the height direction, from left to right, are the flat end 113 of the first battery cell group, the convex end 111 of the second battery cell group, the flat end 113 of the third battery cell group, the convex end 111 of the fourth battery cell group, the flat end 113 of the fifth battery cell group, the convex end 111 of the sixth battery cell group, and the flat end 113 of the seventh battery cell group; one bus 13 can connect the flat end 113 of the first battery cell group and the convex end 111 of the second battery cell group, another bus 13 can connect the flat end 113 of the third battery cell group and the convex end 111 of the fourth battery cell group, another bus 13 can connect the flat end 113 of the fifth battery cell group and the convex end 111 of the sixth battery cell group, and yet another bus 13 connects only the multiple cells 11 of the flat end 113 of the seventh battery cell group. At the opposite end of the battery module 1 in the height direction, from left to right, are the convex end 111 of the first cell group, the flat end 113 of the second cell group, the convex end 111 of the third cell group, the flat end 113 of the fourth cell group, the convex end 111 of the fifth cell group, the flat end 113 of the sixth cell group, and the convex end 111 of the seventh cell group. A bus 13 connects only the multiple cells 11 of the convex end 111 of the first cell group. A bus 13 can connect the flat end 113 of the second cell group and the convex end 111 of the third cell group, another bus 13 can connect the flat end 113 of the fourth cell group and the convex end 111 of the fifth cell group, and yet another bus 13 can connect the flat end 113 of the sixth cell group and the convex end 111 of the seventh cell group.

[0063] Please combine Figure 6 The bracket 12 is provided with a groove 121, which includes a bottom wall 122 and a side wall 123 connected to each other. The bottom wall 122 and the side wall 123 form an inner space 124. The busbar 13 is installed in the inner space 124. In some examples, the thickness of the busbar 13 can be the same as the depth of the groove 121, so that when the busbar 13 is installed in the groove 121, it can fit better with the groove 121 and the overall integrity is better. The bottom wall 122 of the groove is provided with a first mounting through hole 125, and a protruding end 111 is provided in the first mounting through hole 125 and connected to the busbar 13.

[0064] To facilitate the installation of the busbar 13, a groove 121 is provided in the bracket 12. The side wall 123 of the groove 121 facilitates the positioning of the busbar 13, and the bottom wall 122 of the groove is provided with a first mounting through hole 125, thereby facilitating the connection between the busbar 13 installed in the groove space 124 and the protrusion 111 located in the first mounting through hole 125. The battery cell can be a cylindrical battery cell, and the first mounting through hole 125 can be a circular hole.

[0065] Please combine Figure 7 The battery cell 11 includes a casing 112 and a terminal post 114. The casing 112 and the terminal post 114 have a potential difference. The casing 112 includes a casing wall 1121 and a flat end 113 disposed opposite each other along the height direction of the battery module 1. The terminal post 114 includes a protruding end 111, which protrudes outward relative to the casing wall 1121 along the height direction of the battery module 1. (Please refer to...) Figure 4 Part of the bottom wall 122 of the tank is located between the shell wall 1121 and the busbar 13.

[0066] The outer casing 112 includes a casing wall 1121 and a flat end 113 arranged axially opposite to each other along the battery cell 11. This means the casing wall 1121 and the terminal post 114 have a potential difference. The terminal post 114 includes a protruding end 111, which protrudes outward relative to the casing wall 1121. Because the protruding end 111 and the casing wall 1121 are relatively close, when the busbar 13 is connected to the protruding end 111, it is easy to short-circuit by contact with the casing wall 1121. In related technologies, to avoid short-circuiting between the busbar 13 connected to the negative terminal and the casing wall 1121, a barley paper insulating sheet is attached to the end face of the casing wall 1121. However, the barley paper attaching process is cumbersome, resulting in low production efficiency. In this embodiment, a portion of the bottom wall 122 of the tank is located between the shell wall 1121 and the busbar 13, which can isolate or even insulate the shell wall 1121 and the busbar 13. This makes it less likely for the busbar 13 to come into contact with the shell wall 1121 and short-circuit when connected to the protrusion 111.

[0067] In this embodiment, the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 are positioned on a first mounting plane by the bracket 12. This allows the busbar 13 connecting the two battery cells 11 to be configured as a planar structure. Compared to the stepped busbar 13 used in related technologies, this saves the step-stamping process, improves production efficiency, and reduces production costs. Furthermore, part of the bottom wall 122 of the bracket 12 is located between the shell wall 1121 and the busbar 13, which can isolate or even insulate the shell wall 1121 from the busbar 13. This makes it less likely for the busbar 13 to short-circuit with the shell wall 1121 when connected to the convex end 111. Compared to the traditional method using barley paper-coated insulation sheets, the structure is simpler.

[0068] The support 12 is an insulating support and can be made of insulating materials, such as polypropylene (PP), polyphenylene sulfide (PPS), or PA+GF, which is a composite reinforcing material of polyamide (commonly known as nylon, such as PA6 and PA66) and glass fiber (GF). The insulating support can insulate the shell wall 1121 from the busbar 13.

[0069] In some scenarios, the battery cell 11 may include a housing 112 and a terminal 114. The battery cell 11 can be a single-terminal cylindrical battery cell. In one example, the battery cell 11 can be a cylindrical steel-cased battery cell 11, with the housing 112 serving as the positive electrode. The end of the housing 112 facing away from the terminal 114 protruding from the top of the negative electrode is designated as a flat end 113, which is also the positive electrode. The terminal 114 protruding from the top of the negative electrode serves as the negative electrode, and is designated as a convex end 111. In some examples, the steel housing can be made into the positive electrode by directly connecting the inner wall of the housing 112 to the current collector of the positive electrode sheet using conductive adhesive or welding. The end face of the steel housing facing the busbar 13 is then connected to the busbar 13 to achieve an electrical connection between the positive electrode and the busbar 13. The negative terminal 114 can be welded to the copper foil current collector of the negative electrode sheet using nickel strip, thus making the negative terminal 114 the negative electrode. The end face of the negative terminal 114 facing the busbar 13 is connected to the busbar 13, realizing the electrical connection between the negative terminal and the busbar 13.

[0070] Please combine Figure 4 Part of the bottom wall 122 of the groove abuts against the shell wall 1121, so that the end face of the protrusion 111 is coplanar with the first mounting plane.

[0071] When a battery cell 11 is installed on the bracket 12, the shell wall 1121 abuts against the bottom wall 122 of the tank, and the protruding end 111 passes through the through hole. By adjusting the shell wall 1121, the position of the protruding end 111 of the battery cell 11 can be controlled.

[0072] In one example, by providing a suitable thickness to the bottom wall 122 of the tank, when the shell wall 1121 abuts against the bottom wall 122 of the tank and the protrusion 111 passes through the through hole, the end face of the protrusion 111 of the battery cell 11 can be coplanar with the first mounting plane.

[0073] In the bracket 12, the end face of the flat end 113 of the battery cell 11 installed in the first mounting space can be located on the same plane as the end face of the convex end 111 of the battery cell 11 installed in the second mounting space.

[0074] Please combine Figure 5The bottom wall 122 of the tank is provided with a second mounting through hole 126, and the flat end 113 is provided in the second mounting through hole 126 and connected to the busbar 13.

[0075] In one example, cell 11 can be a cylindrical cell, and the second mounting through hole 126 can be a circular hole.

[0076] In some examples, along the second direction y, the bottom wall 122 of the same bracket 12 is provided with a first mounting through hole 125 and a second mounting through hole 126, which makes it easy for the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 to be located on the same plane through the support of the bracket 12.

[0077] By placing a bus 13 in the tank 121, all cells 11 in two adjacent cell groups 110 can be connected.

[0078] In one example, the bottom wall 122 of the tank may only have a first mounting through hole 125, so that a busbar 13 can be installed in the tank 121 to connect to the protruding end 111 of a battery cell assembly 110.

[0079] In one example, the bottom wall 122 of the tank may only have a second mounting through hole 126, so that a busbar 13 can be installed in the tank 121 to connect to the flat end 113 of a battery cell assembly 110.

[0080] Please combine Figure 3 and Figure 4 The bracket 12 also includes an annular wall 127, which is connected to the side of the bottom wall 122 of the tank away from the space 124 inside the tank, and the annular wall 127 is arranged around the outer periphery of the cell 11.

[0081] A battery cell 11 can be installed inside a bracket 12, with its two ends respectively located within the first mounting through hole 125 and the second mounting through hole 126 of the bracket 12 at both ends. An annular wall 127 can be arranged around the outer periphery of the battery cell 11, separating the battery cell 11 installed therein from other battery cells 11, thus avoiding direct contact between the outer shells 112 of adjacent battery cells 11, making it safer and preventing short circuits.

[0082] It is easy to understand that the bracket 12 has a bracket 12 space inside, and the battery cell 11 is installed in the bracket 12 space. The side of the bottom wall 122 of the tank that is away from the space 124 inside the tank is the inner side of the bracket 12, that is, the location of the bracket 12 space inside the bracket 12. This location is used to install the battery cell 11.

[0083] Please combine Figure 6 The bracket 12 also includes a first limiting block 128, which is connected to the side wall 123 of the tank.

[0084] In some examples, the first limiting block 128 includes a first surface 1281 facing the battery cell 11. Along the axial direction of the battery cell 11, the first surface 1281 partially blocks the second mounting through hole 126. The first surface 1281 is coplanar with the first mounting plane. With this configuration, when the flat end 113 of the battery cell 11 is installed in the second mounting through hole 126, the first surface 1281 will limit the installation of the flat end 113, so that the end face of the flat end 113 of the battery cell 11 (i.e., the end face of the flat end 113 of the battery cell 11 facing away from the convex end 111 of the battery cell 11) can be coplanar with the first mounting plane, thereby achieving that the end face of the flat end 113 of one battery cell 11 and the end face of the convex end 111 of another battery cell 11 are both coplanar with the first mounting plane.

[0085] The first limiting block 128 includes a second surface 1282 facing the busbar 13, which is used to limit the busbar 13. The first limiting block 128 can limit the busbar 13 so that the busbar 13 is stably installed in the slot space 124.

[0086] Please combine Figure 5 The busbar 13 has a mating hole 134, and the bracket 12 also includes a second limiting block 129. The second limiting block 129 is installed on the side of the bottom wall 122 of the tank facing the space 124 inside the tank. The second limiting block 129 is used to install in the mating hole 134. The second limiting block 129 is spaced apart from the first limiting block 128.

[0087] By engaging the second limiting block 129 with the mating hole 134, the busbar 13 can be installed more accurately in the correct position within the tank 121. Furthermore, the engagement of the first limiting block 128 with the second limiting block 129 can support the battery cell, allowing it to be installed within the internal space constructed by the bracket.

[0088] Please combine Figure 6 In a groove 121, multiple second limiting blocks 129 can be provided along the first direction x, and multiple mating holes 134 can be provided along the first direction x. This can better install the busbar 13 to the correct position in the groove 121 and make the installation state of the busbar 13 more stable.

[0089] The surface of the second limiting block facing the battery cell is coplanar with the first mounting plane.

[0090] This makes it easy to ensure that the positions of the busbar and the flat end face connection, and the positions of the busbar and the convex end face connection, are on the same plane.

[0091] Please combine Figure 8According to a second aspect of this disclosure, an electrical device 2 is provided, which includes the battery module 1 described above. The electrical device 2 possesses all the beneficial effects of the battery module 1, which will not be elaborated further herein.

[0092] The electrical equipment 2 can be a robot, vehicle, etc.

[0093] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0096] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery module (1), characterized in that, include: The battery cell (11) is a plurality of such cells, each of the battery cells (11) including a protruding end (111) and a flat end (113) disposed opposite to each other along the height direction of the battery module (1), wherein the flat end (113) is one of the positive electrode and the negative electrode, and the protruding end (111) is the other of the positive electrode and the negative electrode; A bracket (12) is used to mount the battery cells (11) such that the end face of the flat end (113) of one battery cell (11) and the end face of the convex end (111) of another battery cell (11) are both coplanar with the first mounting plane; and Busbar (13) is connected to the end face of the flat end (113) of one of the battery cells (11) located on the first mounting plane and the end face of the convex end (111) of the other battery cell (11).

2. The battery module (1) according to claim 1, characterized in that, Multiple battery cells (11) form multiple battery cell groups (110). Each battery cell group (110) includes multiple battery cells (11) arranged along a first direction (x), and the protruding ends (111) of the multiple battery cells (11) are located at the same end in the height direction of the battery module (1). The multiple battery cell groups (110) are arranged along a second direction (y), and the first direction (x) and the second direction (y) have an angle. In any two adjacent battery cell groups (110), the flat end (113) of one battery cell group (110) and the protruding end (111) of another battery cell group (110) are located at the same end in the height direction of the battery module (1). There are multiple busbars (13), and the two ends in the height direction of the battery module (1) are respectively provided with busbars (13).

3. The battery module (1) according to claim 2, characterized in that, A bus (13) is connected to a plurality of the cells (11) in a cell group (110).

4. The battery module (1) according to claim 2, characterized in that, The busbar (13) includes a first busbar sub-section (130) and a second busbar sub-section (132) connected to each other. In two adjacent battery cell groups (110), the first busbar sub-section (130) is used to connect a plurality of battery cells (11) of one battery cell group (110), and the second busbar sub-section (132) is used to connect a plurality of battery cells (11) of the other battery cell group (110).

5. The battery module (1) according to claim 1, characterized in that, The bracket (12) is provided with a groove (121), the groove (121) includes a bottom wall (122) and a side wall (123) connected to each other, the bottom wall (122) and the side wall (123) form an inner space (124), the busbar (13) is installed in the inner space (124), the bottom wall (122) is provided with a first mounting through hole (125), the protrusion (111) is provided in the first mounting through hole (125) and connected to the busbar (13).

6. The battery module (1) according to claim 5, characterized in that, The battery cell (11) includes a housing (112) and a terminal (114). The housing (112) and the terminal (114) have a potential difference. The housing (112) includes a shell wall (1121) and a flat end (113) arranged opposite to each other along the height direction of the battery module (1). The terminal (114) includes a convex end (111). In the height direction of the battery module (1), the convex end (111) protrudes outward relative to the shell wall (1121). Part of the bottom wall (122) of the tank is located between the shell wall (1121) and the busbar (13).

7. The battery module (1) according to claim 6, characterized in that, Part of the bottom wall (122) of the groove abuts against the shell wall (1121) such that the end face of the protrusion (111) is coplanar with the first mounting plane.

8. The battery module (1) according to claim 5, characterized in that, The bottom wall (122) of the tank is provided with a second mounting through hole (126), and the flat end (113) is provided in the second mounting through hole (126) and connected to the busbar (13).

9. The battery module (1) according to claim 8, characterized in that, The bracket (12) further includes a first limiting block (128), which is connected to the side wall (123) of the groove. The first limiting block (128) includes a first surface (1281) facing the battery cell (11), and along the height direction of the battery module, the first surface (1281) partially blocks the second mounting through hole (126), and the first surface (1281) is coplanar with the first mounting plane; and / or The first limiting block (128) includes a second surface (1282) facing the busbar (13), the second surface (1282) being used to limit the busbar (13).

10. The battery module (1) according to claim 9, characterized in that, The busbar (13) has a mating hole (134), and the bracket (12) also includes a second limiting block (129). The second limiting block (129) is installed on the side of the bottom wall (122) of the tank facing the space (124) inside the tank, and is installed in the mating hole (134). The second limiting block (129) is spaced apart from the first limiting block (128).

11. The battery module (1) according to claim 10, characterized in that, The surface of the second limiting block (129) facing the battery cell (11) is coplanar with the first mounting plane.

12. The battery module (1) according to claim 5, characterized in that, The bracket (12) also includes an annular wall (127), which is connected to the side of the bottom wall (122) of the tank away from the space (124) inside the tank, and the annular wall (127) is arranged around the outer periphery of the battery cell (11).

13. An electrical appliance, characterized in that, Includes the battery module (1) as described in any one of claims 1-12.

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