Busbar and battery module

Abstract

The embodiment of the utility model discloses a busbar and a battery module, the busbar comprises a main body section, a bending section and a welding section, and the bending section is connected with the main body section; the welding section comprises at least two welding pieces arranged at intervals, and the at least two welding pieces are connected to the end, away from the main body section, of the bending section. Wherein the thickness of the welding section is smaller than that of the main body section; and in the thickness direction of the main body section, the central plane of the welding section and the central plane of the main body section are not on the same horizontal plane. According to the embodiment of the invention, the welding section is provided with the at least two welding pieces which are arranged at intervals, the thickness of the welding pieces is smaller than that of the main body section, and the central plane of the welding section and the central plane of the main body section are not on the same horizontal plane, so that the busbar can be attached to a plurality of battery cells at the same time, and the busbar with a single-layer structure has a double-layer structure effect; and current can flow between the two welding sheets which are arranged at an interval.

Description

Technical Field

[0001] The present application relates to the technical field of busbars, and in particular to a busbar and a battery module. Background Art

[0002] The busbar is a bridge between cells and plays a role in transmitting current. In the related art, since a single battery module often has multiple cells, it is difficult for the busbar to fit well with multiple cells at the same time, or even if the busbar can fit with multiple cells at the same time, the flatness requirement for the busbar is high. Utility Model Content

[0003] The embodiments of the present application provide a busbar and a battery module, which enable the busbar to be bonded to multiple battery cells at the same time.

[0004] In a first aspect, an embodiment of the present application provides a busbar, comprising a main section, a bending section and a welding section, wherein the bending section is connected to the main section; the welding section comprises at least two welding plates arranged at intervals, and the at least two welding plates are respectively connected to one end of the bending section away from the main section; wherein the thickness of the welding section is smaller than the thickness of the main section; and in the thickness direction of the main section, the center plane of the welding section and the center plane of the main section are not on the same horizontal plane.

[0005] The thickness of the welding section in the embodiment of the present application is smaller than the thickness of the main section, so the welding section is easy to deform. During welding, the welding section can be slightly deformed, so that the welding section fits tightly with multiple battery cells.

[0006] In the second aspect, an embodiment of the present application provides a battery module, including a cell holder, a cell assembly, and at least one bus, the cell assembly includes a plurality of cells, the plurality of cells are all arranged on the cell holder, the bus is all arranged on the cell holder, and in the same bus, two adjacent welding plates on the same welding section are grouped together and welded to one pole of one of the cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 This is a schematic diagram of the structure of a battery module in one embodiment of the present application;

[0009] Figure 2This is a schematic diagram of the structure of a battery module in another embodiment of the present application;

[0010] Figure 3 This is a schematic diagram of the structure of a bus bar in one embodiment of the present application;

[0011] Figure 4 is a schematic structural diagram of a bus bar in another embodiment of the present application;

[0012] Figure 5 for Figure 4 The enlarged schematic diagram of point A in the middle;

[0013] Figure 6 This is a schematic diagram of the structure of a bus bar in another embodiment of the present application;

[0014] Figure 7 for Figure 6 The enlarged schematic diagram of point B in the middle;

[0015] Figure 8 This is a schematic diagram of the structure of a bus bar in another embodiment of the present application;

[0016] Fig. 9 for Figure 8 Enlarged schematic diagram of point C in the middle.

[0017] Explanation of the accompanying drawings: 10, battery module; 100, bus; 110, main section; 110a, opening; 111, first part; 112, second part; 120, bending section; 121, transition section; 122, curved section; 123, bending sheet; 130, welding section; 131, welding sheet; 140, welding protrusion; 140a, groove; 200, battery cell holder; 300, battery cell assembly; XX, first direction. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] like Figure 1-2 As shown, the first aspect of the embodiment of the present application provides a battery module 10 , which can be applied to outdoor power supplies, power batteries, etc. The battery module 10 includes a battery cell support 200 , a battery cell assembly 300 and at least one bus bar 100 .

[0020] The battery cell assembly 300 is used to store electric energy. The battery cell assembly 300 includes a plurality of battery cells, which can be connected in series, in parallel or in mixed connection, so as to achieve different output parameters according to requirements. The type of the battery cell can be, for example, a cylindrical battery cell.

[0021] The battery cell holder 200 is used to fix the battery cell assembly 300 to avoid mutual collision between multiple battery cells, and at the same time, to avoid the battery cells from being squeezed by external forces as much as possible, so as to protect the battery cells. Exemplarily, a plurality of battery cell mounting holes can be provided on the battery cell holder 200, and each battery cell corresponds to a battery cell mounting hole. The battery cell holder 200 can be composed of two parts, so as to facilitate the assembly of the battery cell and the battery cell holder 200. Exemplarily, the material of the battery cell holder 200 can be plastic, which is relatively light and can reduce the weight of the battery module 10. Moreover, the plastic holder has good insulation, which can reduce the probability of short circuit between battery cells. At the same time, the required complex shape can be manufactured by injection molding, which is low in cost.

[0022] The busbar 100 is connected to multiple battery cells to gather the current of multiple battery cells and connect each battery cell in a preset series-parallel manner. In a single battery module 10, the number of busbars 100 can be one or more, and the shapes of multiple busbars 100 can be the same or different. The shape of the busbar 100 is related to the arrangement of the battery cells and the series-parallel manner, and can be adjusted according to specific needs.

[0023] In some embodiments, the bus 100 is disposed on the battery cell holder 200 , the battery cell holder 200 has a positioning column, and the bus 100 has a positioning hole. The positioning column is adapted to the positioning hole, thereby limiting the bus 100 and facilitating the alignment and installation of the bus 100 and the battery cell holder 200 .

[0024] like Figure 3 As shown, the second aspect of the embodiment of the present application provides a busbar 100, which is a single-layer structure and can be made by stamping or casting. Compared with a double-layer busbar, the single-layer busbar 100 of the embodiment of the present application omits the welding process, has higher production efficiency and lower cost, and does not have the problem of double-layer busbar desoldering, and has more stable performance.

[0025] The material of the busbar 100 may be metal, so as to have good conductivity. For example, the material of the busbar 100 may be T2 copper, pure nickel, copper-tin alloy, nickel-plated steel, tinplate, etc.

[0026] It should be noted that the double-layer bus referred to in this application refers to a bus 100 formed by welding two metal sheets together. In actual production, in order to improve the corrosion resistance of the bus 100, a coating treatment, such as nickel plating, is usually performed on the surface of the bus 100, so that the surface of the bus 100 has one or more layers of coating, and the bus 100 with the coating still belongs to the category of the single-layer bus 100 described in this application.

[0027] The structure of the busbar 100 is described in detail below. The busbar 100 includes a main body section 110 , a bending section 120 and a welding section 130 .

[0028] The main section 110 is the main part of the busbar 100 and plays the role of gathering current. According to the arrangement and series-parallel connection of the battery cells, the shape of the main section 110 can be adaptively adjusted so that the main section 110 can roughly cover the battery cells to be welded.

[0029] The bending section 120 is connected to the main section 110, and the surface of the bending section 120 can be a curved surface, and the bending section 120 and the main section 110 have a smooth transition, or the surface of the bending section 120 can be a plane, and the bending section 120 and the main section 110 are set at an angle. The bending section 120 is bent relative to the main section 110, and in the thickness direction of the main section 110, the welding section 130 and the main section 110 are spaced apart, which is equivalent to a height difference between the welding section 130 and the main section 110. For example, the bending section 120 is bent toward the position where the battery cell is located so that the welding section 130 is close to the battery cell, which facilitates the welding of the welding section 130 and the battery cell. It can be understood that if the bending section 120 is not provided, the bus 100 is flat, and the bus 100 needs to be welded to multiple battery cells at the same time. At this time, the surface flatness of the bus 100 and the assembly accuracy of the battery cells are required to be relatively high. In the embodiment of the present application, a bending section 120 is provided. During welding, the bending section 120 may undergo a certain deformation, thereby ensuring that the welding section 130 is closely fitted to the battery cell with a greater probability.

[0030] The welding section 130 includes at least two welding sheets 131 arranged at intervals, and at least two welding sheets 131 are respectively connected to one end of the bending section 120 away from the main section 110. In the same busbar 100, two adjacent welding sheets 131 on the same welding section 130 are a group and welded to one pole of one of the battery cells. During welding, the two welding sheets 131 are simultaneously in contact with one pole of the battery cell, and a welding current is applied between the two welding sheets 131, so that the two welding sheets 131 are simultaneously welded to one pole of the battery cell. Since the welding section 130 includes two welding sheets 131, even if one of the two welding sheets 131 fails to be welded to the battery cell, the other welding sheet 131 still has a certain conductivity, thereby reducing the impact of the welding failure of the welding sheet 131 on the discharge capacity of the battery module 10.

[0031] The thickness of the welding section 130 is less than that of the main section 110, that is, the thickness of the two welding pieces 131 is less than that of the main section 110, which is conducive to the welding of the welding section 130 and the battery cell. If the welding section 130 is thicker, it is difficult for the welding section 130 to melt, which may cause the welding strength between the welding section 130 and the battery cell to be low, or the welding section 130 releases too much heat when melting, which may cause damage to the battery cell.

[0032] In the thickness direction of the main body section 110, the center plane of the welding section 130 is not on the same horizontal plane as the center plane of the main body section 110. The welding section 130 has a first surface and a second surface arranged oppositely in the thickness direction, and the center plane of the welding section 130 is a plane with equal distances from the first surface and the second surface; the main body section 110 has a third surface and a fourth surface arranged oppositely in the thickness direction, and the center plane of the main body section 110 is a plane with equal distances from the third surface and the fourth surface. Exemplarily, the bottom surface of the welding section 130 can be lower than the bottom surface of the main body section 110, so that by pressing the main body section 110, the bending section 120 or the welding section 130 is deformed, so that the welding section 130 is closely fitted with the battery cell; or the bottom surface of the welding section 130 can be on the same plane as the bottom surface of the main body section 110. Since the welding section 130 is relatively thin and easy to deform, by pressing the welding section 130, the welding section 130 can be closely fitted with the battery cell.

[0033] In summary, the welding section 130 of the embodiment of the present application has at least two welding plates 131 arranged at intervals, and the thickness of the welding section 130 is less than the thickness of the main section 110. The central plane of the welding section 130 and the central plane of the main section 110 are not on the same horizontal plane. This not only enables the bus 100 to be bonded to multiple battery cells at the same time, but also makes the single-layer bus 100 have a double-layer structural effect, and current can also pass between the two welding plates 131 arranged at intervals.

[0034] like Figure 3 As shown, in some embodiments, the bending section 120 includes at least two bending pieces 123 arranged at intervals, one end of each bending piece 123 is connected to the main section 110, and the other end is connected to the corresponding welding piece 131. By arranging two bending pieces 123 at intervals, it is possible to save materials and reduce costs while ensuring the flow capacity, and it is possible to make a single bending piece 123 easy to deform, which is conducive to the close fit of the welding section 130 and the battery cell. It is understandable that the bending section 120 can be a whole, that is, the two bending pieces 123 are connected as a whole, so as to improve the strength.

[0035] like Figure 3 As shown, in some embodiments, the portion of the main body section 110 connected to the bending section 120 includes a first portion 111 and a second portion 112 arranged at intervals, an end of the first portion 111 away from the main body section 110 is connected to one of the bending pieces 123, and an end of the second portion 112 away from the main body section 110 is connected to a bending piece 123 arranged adjacent to one of the bending pieces 123. That is, the first portion 111 and the second portion 112 are respectively connected to the corresponding two bending pieces 123, thereby saving materials and reducing costs while ensuring the flow capacity.

[0036] like Figure 3 As shown, in some embodiments, an opening 110a is provided between one end of the first portion 111 away from the corresponding bending piece 123 and one end of the second portion 112 away from the corresponding bending piece 123, and the shape of the opening 110a can be exemplarily a circular hole. By providing the opening 110a, the transition between the first portion 111 and the second portion 112 and the main section 110 can be smoother, and the stress at the connection between the first portion 111 and the second portion 112 and the main section 110 can be reduced to avoid the generation of weak points.

[0037] like Figure 3 As shown, in some embodiments, a plurality of bending sections 120 and corresponding plurality of welding sections 130 are provided on the bus 100, and the ends of the plurality of welding sections 130 located at the same end of the main section 110 and the ends of the plurality of welding sections 130 located at the other end of the main section 110 are oriented in opposite directions, thereby making full use of the size of the bus 100 to shorten the space occupied and save costs.

[0038] like Figure 3 As shown, in some embodiments, the multiple welding segments 130 located on the same side of the main body segment 110 are arranged in parallel with the multiple welding segments 130 located on the other side of the main body segment 110. Therefore, during welding, the welder can move along a straight line and directly weld the multiple welding segments 130 in sequence without adjusting the direction of the busbar 100, thereby increasing the welding speed.

[0039] like Figure 4-5 As shown, in some embodiments, the bending section 120 includes a transition section 121 and a curved section 122 .

[0040] The transition section 121 is connected to the main section 110, and the thickness of the transition section 121 gradually decreases along the first direction XX, and the first direction XX is the direction from the end of the transition section 121 close to the main section 110 to the end close to the curved section 122. Since the thickness of the transition section 121 gradually decreases, the strength of the transition section 121 changes more steadily, and the surface of the transition section 121 is smoother and less prone to local stress. The transition section 121 can be processed by grinding and reducing the thickness, or the transition section 121 can be processed by cold heading.

[0041] Optionally, the thickness of one end of the transition section 121 connected to the main section 110 is the same as the thickness of the main section 110, so that the transition at the connection between the transition section 121 and the main section 110 is smoother, has less stress, and is easier to process.

[0042] Optionally, the upper surface of the transition section 121 is a plane parallel to the main section 110, and along the first direction XX, the lower surface of the transition section 121 gradually approaches the upper surface. The lower surface of the transition section 121 can be a curved surface or a plane. When the lower surface of the transition section 121 is a plane, the transition between the transition section 121 and the main section 110 is smoother.

[0043] Alternatively, the lower surface of the transition section 121 is a plane parallel to the main section 110, and along the first direction XX, the upper surface of the transition section 121 gradually approaches the lower surface. The upper surface of the transition section 121 can be a curved surface or a plane. When the upper surface of the transition section 121 is a plane, the transition between the transition section 121 and the main section 110 is smoother.

[0044] Alternatively, along the first direction XX, the upper surface and the lower surface of the transition section 121 gradually approach each other, and the upper surface of the transition section 121 may be a curved surface or a flat surface. When the upper surface of the transition section 121 is a flat surface, the transition between the transition section 121 and the main section 110 is relatively smooth. The lower surface of the transition section 121 may be a curved surface or a flat surface. When the lower surface of the transition section 121 is a flat surface, the transition between the transition section 121 and the main section 110 is relatively smooth.

[0045] The curved section 122 is connected to one end of the transition section 121 away from the main section 110, and the welding section 130 is connected to one end of the curved section 122 away from the transition section 121. The curved section 122 is used to space the welding section 130 and the main section 110 in the thickness direction of the main section 110, thereby facilitating the welding of the welding section 130 and the battery cell.

[0046] Optionally, the thickness of the bending section 120 is the same as the thickness of one end of the transition section 121 connected to the bending section 120, so that the transition at the connection between the bending section 120 and the transition section 121 is smoother, with less stress and easier processing.

[0047] In some embodiments, the thickness of the main body segment 110 ranges from 0.6 mm to 1.5 mm. If the thickness of the main body segment 110 is less than 0.6 mm, the main body segment 110 has poor conductivity and low strength. If the thickness of the main body segment 110 is greater than 1.5 mm, the main body segment 110 is thick and difficult to process, and the main body segment 110 is heavy, and more raw materials are used, resulting in higher costs. If the thickness of the main body segment 110 is 0.6 mm to 1.5 mm, the main body segment 110 has both sufficient conductivity and sufficient strength, and the cost and weight are more appropriate.

[0048] In some embodiments, the thickness of the welding section 130 ranges from 0.25 mm to 0.45 mm. If the thickness of the welding section 130 is less than 0.25 mm, the flow conductivity of the welding section 130 will be poor, and the heat generated by the welding section 130 will be large during use. If the thickness of the welding section 130 is greater than 0.45 mm, it will be difficult for the welding section 130 to melt, which may easily result in a low welding strength between the welding section 130 and the battery cell, or excessive heat will be released when the welding section 130 melts, which may easily damage the battery cell.

[0049] Moreover, if the welding section 130 is processed by cold heading, the thickness of the welding section 130 cannot be too different from the thickness of the main section 110 due to the limitation of the processing equipment, otherwise it cannot be processed or the processing is difficult. For example, when the thickness of the main section 110 is 0.6 mm, the thickness of the welding section 130 can be 0.25 mm. When the thickness of the main section 110 is 1.5 mm, the thickness of the welding section 130 can be 0.45 mm.

[0050] like Figure 6-7 As shown, in some embodiments, the dimension L1 of the transition section 121 in the first direction XX is greater than or equal to 3 mm. If the dimension L1 of the transition section 121 in the first direction XX is less than 3 mm, the transition section 121 is too short, the thickness of the transition section 121 varies greatly, and the processing is difficult. If the dimension L1 of the transition section 121 in the first direction XX is greater than or equal to 3 mm, the thickness of the transition section 121 varies less, and the processing is easy.

[0051] In some embodiments, the welding section 130 is parallel to the main section 110, and the dimension L2 of the welding section 130 in the first direction XX is greater than or equal to 6 mm. If the dimension L2 of the welding section 130 in the first direction XX is less than 6 mm, the flow capacity of the welding section 130 is poor, and the welding section 130 is not easy to align with the welding needle of the welding equipment. If the dimension L2 of the welding section 130 in the first direction XX is greater than or equal to 6 mm, the flow capacity of the welding section 130 is good, and the welding section 130 has more redundant positions, which is conducive to the alignment and abutment of the welding section 130 with the welding needle of the welding equipment.

[0052] like Figure 5As shown, in some embodiments, the busbar 100 further includes at least two welding protrusions 140, and the two welding protrusions 140 are respectively protruded on the surfaces of the two welding pieces 131 away from the main section 110. Compared with the contact between the welding section 130 and the battery cell, the contact area between the welding protrusion 140 and the battery cell is smaller, that is, the resistance between the welding protrusion 140 and the battery cell is relatively large, so that the heat generated between the welding protrusion 140 and the battery cell can be increased, so that the welding protrusion 140 can be melted quickly to achieve the fusion of the welding protrusion 140 and the battery cell. In addition, since the contact area between the welding protrusion 140 and the battery cell is smaller, the current is concentrated on the welding protrusion 140, that is, the heat is concentrated on the welding protrusion 140, so that the welding protrusion 140 can also be melted quickly.

[0053] like Figure 5 As shown, in some embodiments, the contour surface of the welding protrusion 140 is a curved surface, and the welding protrusion 140 is roughly in line contact with the battery cell when it abuts against the battery cell. Therefore, the contact area when the welding protrusion 140 abuts against the battery cell will be further reduced, and the resistance between the welding protrusion 140 and the battery cell will be further increased. The current is further concentrated on the contact part between the welding protrusion 140 and the battery cell, and thus the heat generation of the welding protrusion 140 will be further increased, thereby making welding easier.

[0054] like Figure 5 As shown, in some embodiments, there are multiple welding segments 130, and every two welding segments 130 form a group. The two welding segments 130 in the same group are arranged at intervals, and the two welding protrusions 140 in the same group are arranged at intervals, and a group of welding segments 130 is welded to one electrode of one of the battery cells. During welding, the welding needles of the welding equipment are respectively in contact with the two welding segments 130 in the same group, and the current on one welding needle flows through the corresponding welding segment 130, the welding protrusion 140, the electrode of the battery cell, the other welding protrusion 140, the other welding segment 130 in sequence, and then flows into the other welding needle to form a current loop.

[0055] like Figure 8-9As shown, in some embodiments, the spacing L3 between two welding protrusions 140 in the same group is 4mm-5mm. If the spacing L3 between two welding protrusions 140 in the same group is less than 4mm, the two welding protrusions 140 are too close, so that the two heating parts on the battery cell are close to each other, which may cause local overheating of the battery cell and cause damage. If the spacing L3 between two welding protrusions 140 in the same group is greater than 5mm, the distance between the two welding protrusions 140 on the battery cell is far, and the resistance between the two welding protrusions 140 is large, so that the welding current is reduced, affecting the welding effect. If the spacing L3 between two welding protrusions 140 in the same group is 4mm-5mm, the distance between the two welding protrusions 140 is more appropriate, the battery cell has sufficient heat dissipation space, and the welding current is more appropriate, which can ensure the welding effect between the welding protrusion 140 and the battery cell.

[0056] like Figure 8-9 As shown, in some embodiments, the spacing L4 between the welding protrusion 140 and the end of the welding section 130 away from the bending section 120 is 2.5mm-3.5mm. If the spacing L4 between the welding protrusion 140 and the end of the welding section 130 away from the bending section 120 is less than 2.5mm, the flow conductivity of the welding section 130 is limited and insufficient to withstand the current during welding. If the spacing L4 between the welding protrusion 140 and the end of the welding section 130 away from the bending section 120 is greater than 3.5mm, the flow conductivity effect of the welding section 130 is saturated, material is wasted, and the space occupied by the welding section 130 is increased. If the spacing L4 between the welding protrusion 140 and the end of the welding section 130 away from the bending section 120 is 2.5mm-3.5mm, the welding section 130 has both sufficient flow conductivity and a relatively small volume.

[0057] In some embodiments, the length of the welding protrusion 140 is 1.2 mm-2.5 mm. If the length of the welding protrusion 140 is less than 1.2 mm, the size of the welding protrusion 140 is small, and the contact area between the welding protrusion 140 and the battery core after welding is small, which affects the welding strength. If the length of the welding protrusion 140 is greater than 2.5 mm, the size of the welding protrusion 140 is large, and the current of the welding protrusion 140 is not concentrated enough, which affects the welding effect. If the length of the welding protrusion 140 is 1.2 mm-2.5 mm, the size of the welding protrusion 140 is more appropriate, which can ensure both the welding effect and the welding strength.

[0058] In some embodiments, the width of the welding protrusion 140 is 0.8 mm-1.2 mm. If the width of the welding protrusion 140 is less than 0.8 mm, the size of the welding protrusion 140 is small, and the contact area between the welding protrusion 140 and the battery core after welding is small, which affects the welding strength. If the width of the welding protrusion 140 is greater than 1.2 mm, the size of the welding protrusion 140 is large, and the current of the welding protrusion 140 is not concentrated enough, which affects the welding effect. If the width of the welding protrusion 140 is 0.8 mm-1.2 mm, the size of the welding protrusion 140 is more appropriate, which can ensure both the welding effect and the welding strength.

[0059] In some embodiments, the height of the welding protrusion 140 is 0.2mm-0.4mm. If the height of the welding protrusion 140 is less than 0.2mm. The height of the welding protrusion 140 is relatively low, and the molten solder formed by the melting of the welding protrusion 140 is relatively small, which affects the welding effect. If the height of the welding protrusion 140 is greater than 0.4mm, the welding section 130 is far away from the battery cell after welding, and the force arm length of the welding section 130 relative to the battery cell is relatively long, so the risk of the welding protrusion 140 detaching from the battery cell after welding is relatively high. If the height of the welding protrusion 140 is 0.2mm-0.4mm, the height of the welding protrusion 140 is more appropriate, and the welding protrusion 140 has sufficient solder after melting, and the welding section 130 is close to the battery cell after welding, thereby ensuring both the welding effect and the low risk of welding failure.

[0060] like Fig. 9 As shown, in some embodiments, the two welding segments 130 in the same group are arranged in mirror symmetry, so that the resistance characteristics of the two welding segments 130 in the same group are as similar as possible, which is beneficial to keep the welding strength between the two welding protrusions 140 and the battery cell consistent.

[0061] like Fig. 9 As shown, in some embodiments, the projection of the welding protrusion 140 in the thickness direction of the welding section 130 has an oblong hole shape, so that after the welding protrusion 140 is welded to the battery cell, the contour of the contact portion between the welding protrusion 140 and the battery cell is an oblong hole shape, and the transition of the contour of the contact portion between the welding protrusion 140 and the battery cell is relatively smooth, thereby reducing the generation of stress. In addition, when the shape of the battery cell is cylindrical, the two welding protrusions 140 with oblong hole-shaped outer contours can fully increase the contact area with the battery cell, achieving a better welding effect.

[0062] like Fig. 9As shown, in some embodiments, the surface of the welding section 130 facing the main section 110 forms a groove 140a at a position corresponding to the welding protrusion 140, so that the welding protrusion 140 can be manufactured by a stamping process, reducing production costs and improving production efficiency. At the same time, since the welding protrusion 140 is hollow, the welding protrusion 140 is easier to melt during welding, which is beneficial to the welding effect.

[0063] like Fig. 9 As shown, in some embodiments, the contour line of one end of the welding section 130 away from the bending section 120 is a curve, thereby enhancing the conductivity of the transition section 121 and avoiding the occurrence of tip discharge.

[0064] In some embodiments, the busbar 100 is integrally formed, so that the busbar 100 has better stability and higher structural strength.

[0065] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0066] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A busbar, characterized in that: The busbar is a single-layer structure, and the busbar comprises: The main body paragraph; A bending section connected to the main section; A welding section, comprising at least two welding sheets arranged at intervals, wherein the at least two welding sheets are respectively connected to one end of the bending section away from the main section; The thickness of the welding section is smaller than the thickness of the main section; in the thickness direction of the main section, the center plane of the welding section and the center plane of the main section are not on the same horizontal plane.

2. The busbar according to claim 1, characterized in that: The bending section comprises: A transition section connected to the main section; a curved section connected to an end of the transition section away from the main section, and the welding section connected to an end of the curved section away from the transition section; Wherein, along a first direction, the thickness of the transition section gradually decreases, and the first direction is a direction from an end of the transition section close to the main section to an end close to the curved section.

3. The busbar according to claim 1, characterized in that: The thickness of the main body section ranges from 0.6 mm to 1.5 mm, and / or the thickness of the welding section ranges from 0.25 mm to 0.45 mm.

4. The busbar according to claim 1, characterized in that: The busbar further comprises: At least two welding protrusions, one of the welding protrusions is protruded on a surface of the welding sheet facing away from the main body section.

5. The busbar according to claim 1, characterized in that: The bending section includes at least two bending pieces arranged at intervals, one end of each bending piece is connected to the main section, and the other end is connected to the corresponding welding piece.

6. The busbar according to claim 5, characterized in that: The main section portion connected to the bending section includes a first portion and a second portion which are spaced apart, wherein an end of the first portion away from the main section is connected to one of the bending pieces, and an end of the second portion away from the main section is connected to the bending piece which is adjacent to one of the bending pieces.

7. The busbar according to claim 4, characterized in that: The at least two welding sheets in the same group are arranged in mirror symmetry; and / or The projection of the welding protrusion in the thickness direction of the welding section has an oblong hole shape; and / or, A groove is formed on the surface of the welding section facing the main section at a position corresponding to the welding protrusion; and / or, The contour line of one end of the welding section away from the bending section is a curve.

8. The busbar according to claim 6, characterized in that: An opening is provided between one end of the first part away from the corresponding bending piece and one end of the second part away from the corresponding bending piece.

9. The busbar according to any one of claims 1 to 8, characterized in that: The busbar is provided with a plurality of the bending segments and a corresponding plurality of the welding segments, and the ends of the plurality of the welding segments located at the same end of the main body segment and the ends of the plurality of the welding segments located at the other end of the main body segment face in opposite directions; and / or, The plurality of welding sections located on the same side of the main body section are arranged in parallel with the plurality of welding sections located on the other side of the main body section.

10. A battery module, characterized in that: include: Battery cell support; A battery cell assembly, comprising a plurality of battery cells, wherein the plurality of battery cells are arranged on the battery cell bracket; and At least one busbar as described in any one of claims 1 to 9, wherein the busbars are all arranged on the battery cell holder; in the same busbar, two adjacent welding pieces on the same welding section are grouped together and welded to one pole of one of the battery cells.

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