Bus and battery pack

Abstract

The embodiment of the present application provides a busbar, which relates to the field of battery technology. The busbar includes: a busbar body and at least one connecting portion arranged on the busbar body, the connecting portion is used to connect with a battery cell; wherein the connecting portion is provided with a plurality of connecting protrusions and a plurality of annular grooves, and an annular groove is arranged around a connecting protrusion. In the embodiment of the present application, the connecting portion of the busbar is provided with a connecting protrusion, which can strengthen the connection between the busbar and the battery cell pole, effectively reduce the occurrence of cold welding, and ensure the quality of the battery pack; the setting of the annular groove around the protrusion is also conducive to collecting metal debris generated during welding, preventing metal debris from remaining on the surface of the busbar and causing an uneven welding surface, thereby improving the welding quality of the battery pack.

Description

Technical Field

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

[0002] In the battery pack, the busbar is generally connected to the battery cell by laser welding. During welding, due to the limited focusing range of the laser beam, it is necessary to ensure that the welding point between the busbar and the battery cell falls precisely within the focusing range of the laser beam. Busbar displacement can easily lead to welding failure, and the busbar is prone to cold welding when welding with the battery cell pole, causing quality problems in the battery pack; in addition, metal debris is easily generated during the welding process of the busbar and the battery cell. The metal debris remaining on the surface of the busbar will cause an uneven welding surface and affect the welding quality. Utility Model Content

[0003] The present application aims to provide a busbar and a battery pack to improve the welding quality between the busbar and the battery cells in the battery pack.

[0004] In order to solve the above technical problems, this application is implemented as follows:

[0005] In a first aspect, the present application discloses a busbar, the busbar comprising: a busbar body and at least one connecting portion disposed on the busbar body, the connecting portion being used to connect to a battery cell; wherein:

[0006] The connecting portion is provided with a plurality of connecting protrusions and a plurality of annular grooves, and one of the annular grooves is arranged around one of the connecting protrusions.

[0007] Optionally, a plurality of the connection bumps are arranged at intervals around the center of the connection portion.

[0008] Optionally, the thickness of the busbar body is a first thickness t, and the height of the connection protrusion protruding from the busbar body is a first height h; satisfying: 1 / 2t≤h≤t.

[0009] Optionally, the orthographic projection of the connection bump on the busbar body is a circle, and the diameter of the connection bump is a first diameter d, satisfying: t≤d≤2t.

[0010] Optionally, the battery cell has a positive electrode cap, the diameter of the positive electrode cap is a second diameter D, and the distance between the connection protrusion and the center of the connection portion is D1; ​​satisfying: d+0.5≤D1≤1 / 2(D-d).

[0011] Optionally, the first thickness satisfies: 0.2mm≤t≤0.5mm.

[0012] Optionally, the busbar further includes a conducting portion, and the conducting portion can be bendably connected to at least one of the connecting portions.

[0013] In a second aspect, the present application further discloses a battery pack, comprising: a shell, and a plurality of battery cells, a protection plate, a support block, and a plurality of bus bars as described above arranged in the shell; wherein,

[0014] The battery cells extend along a first direction, and a plurality of the battery cells are arranged in an array along the first direction and a second direction; the support block extends along the first direction and is arranged between two adjacent battery cells arranged along the second direction; a plurality of the bus bars are arranged at intervals along the first direction between adjacent battery cells and / or between the battery cells and the shell; wherein the first direction intersects with the second direction.

[0015] Optionally, the support block is provided with a positioning portion, and the positioning portion is used for positioning the support block when connected to the protection plate.

[0016] An insulating member is further arranged between the support block and the protection plate, and the insulating member is provided with a notch at a position corresponding to the positioning portion to provide an escape space for the positioning portion.

[0017] In the embodiment of the present application, a connection bump is provided on the connection portion of the busbar, and the connection bump can strengthen the connection between the busbar and the battery cell pole, effectively reduce the occurrence of cold welding, and ensure the quality of the battery pack; in addition, this busbar is suitable for the bump welding method to achieve the connection between the busbar and the battery cell. The bump welding method allows the busbar to weld multiple welding points at the same time in the same welding cycle, and the welding strength is uniform, which improves the production efficiency and enhances the stability of the welding quality. The setting of the circumferential annular groove of the bump is also conducive to collecting metal debris generated during welding, preventing metal debris from remaining on the surface of the busbar, resulting in an uneven welding surface, thereby affecting the welding quality of the battery pack.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a top view of the busbar described in the embodiment of the present application;

[0021] Figure 2 is a cross-sectional view of the busbar described in the embodiment of the present application;

[0022] Figure 3 yes Figure 3 The enlarged schematic diagram of the middle A part;

[0023] Figure 4 is a schematic diagram of the connection between the busbar and the battery cell according to the embodiment of the present application;

[0024] Figure 5 is an exploded diagram of the battery pack described in the embodiment of the present application;

[0025] Figure 6 yes Figure 5 The enlarged schematic diagram of the middle part B;

[0026] Figure 7 is a cross-sectional view of a battery pack according to an embodiment of the present application;

[0027] Figure 8 is a cross-sectional view of the support block described in the embodiment of the present application;

[0028] Fig. 9 It is a schematic diagram of the end structure of the support block described in the embodiment of the present application.

[0029] Figure numerals: 100 - bus; 10 - bus body; 101 - connection part; 1011 - connection protrusion; 1012 - annular groove; 200 - shell; 300 - battery cell; 301 - positive electrode cap; 400 - protection plate; 500 - support block; 501 - positioning part; 600 - insulating member; 601 - notch. DETAILED DESCRIPTION

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

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

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

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the preparation of batteries, a busbar is usually required to connect cells in series or in parallel to meet the voltage and capacity requirements of different batteries. The present application embodiment provides a busbar, which can be widely used in the fields of electricity, electronics, new energy, aviation, etc. The present application embodiment does not specifically limit the application scenario of the busbar.

[0035] In the embodiment of the present application, the first direction is the direction indicated by the arrow x in the figure, the second direction is the direction indicated by the arrow y in the figure, and the third direction is the direction indicated by the arrow z in the figure, wherein the first direction, the second direction, and the third direction intersect each other; preferably, the first direction, the second direction, and the third direction are perpendicular to each other. The perpendicularity includes a reasonable angle range with a certain floating angle from 90°, which can achieve the technical effect required by the present application, such as 90°±10°.

[0036] Reference Figure 1 , showing a top view of the busbar described in the embodiment of the present application; referring to Figure 2 , showing a cross-sectional view of the busbar described in the embodiment of the present application; referring to Figure 3 , showing Figure 3 Enlarged schematic diagram of part A in the middle; refer to Figure 4 , showing a schematic diagram of the connection between the busbar and the battery cell described in an embodiment of the present application.

[0037] like Figures 1 to 4As shown, the bus may specifically include: a bus body 10 and at least one connecting portion 101 arranged on the bus body 10, and the connecting portion 101 is used to connect with the battery cell 300; wherein, a plurality of connecting protrusions 1011 and a plurality of annular grooves 1012 are arranged on the connecting portion 101, and an annular groove 1012 is arranged around a connecting protrusion 1011.

[0038] In the embodiment of the present application, the bus includes two connecting parts 101, and the two connecting parts 101 are respectively used to connect two adjacent battery cells 300; each connecting part 101 is provided with a plurality of connecting bumps 1011, and the plurality of connecting bumps 1011 are arranged in a ring to achieve a stronger connection with the battery cells 300; it should be noted that the bus body 10 includes two sides arranged in opposite directions, and the connecting bumps 1011 are convex on one side of the bus body 10 and are connected to the battery cells 300, and the connecting bumps 1011 are concave on the other side of the bus body 10.

[0039] In the traditional process, the laser welding process is generally used to achieve the connection between the bus and the battery 300. When the laser welding process is used, the laser beam is very concentrated, and the focusing range of the laser beam is limited. The parts of the bus and the battery 300 that need to be welded must be within the focusing range of the laser beam. Therefore, before welding, the welding points of the bus and the battery 300 need to be accurately positioned to avoid a large deviation in the relative position between the two. This reduces the fault tolerance of the relative position between the bus welding points and the battery 300 to a certain extent, and increases the time cost of the work preparation before welding; when the relative position between the two is offset, so that the welding part falls outside the focusing range of the laser beam, it is easy to cause welding failure, resulting in waste of production materials, and re-welding will also reduce production efficiency; and when laser welding is used, the welding points need to be spot welded one by one, and the welding efficiency is low, which is not conducive to improving the efficiency of battery production. In addition, when the laser energy of laser welding is too large, the laser is easy to penetrate the battery 300 during the welding process, causing the battery 300 to catch fire, which increases the safety risk of welding the battery 300.

[0040] In practical applications, a connection bump 1011 is provided on the connection portion 101 of the busbar, and the busbar having the connection bump 1011 is suitable for the projection welding process. When the busbar is welded to the battery cell 300, the busbar contacts the battery cell 300 using the connection bump 1011. At the connection bump 1011, the current is more concentrated and the chance of shunting is smaller, thereby ensuring that the welding current is concentrated in the welding area, so that the busbar can be welded by arranging the connection bump 1011 in a narrow position, which is suitable for the case where the connection portion 101 of the busbar body 10 is small in area. In addition, when the projection welding process is used, multiple connection bumps 1011 can be welded simultaneously in the same welding cycle, so that the welding strength of each connection bump 1011 is more uniform, which is conducive to improving the welding quality, reducing the occurrence of false welding and cold welding, and also conducive to improving production efficiency.

[0041] In the embodiment of the present application, an annular groove 1012 is also provided around each connection protrusion 1011, wherein the concave direction of the annular groove 1012 is opposite to the convex direction of the connection protrusion 1011. In practical applications, the bus is a metal structure, and the filler material used in the welding process generally contains some metal alloys and flux. When the filler material is heated and melted, metal debris will be formed on its surface. Such metal debris generated during the welding process has an important impact on the welding quality, including: reducing the mechanical properties of the weld and reducing the sealing performance of the welded joint, thereby affecting the strength and stability of the welded structure and bringing potential safety hazards to the battery pack. When the bus is welded to the battery cell 300, since the connection protrusion 1011 is provided with an annular groove 1012, the annular groove 1012 can be used to collect the metal debris generated during the welding process to ensure the flatness of the welding surface between the bus and the battery cell 300 and the welding quality of the battery pack.

[0042] In the embodiment of the present application, a plurality of connection bumps 1011 are arranged at intervals around the center of the connection portion 101; four connection bumps 1011 are arranged around the center of each connection portion 101. With the arrangement of a plurality of connection bumps 1011, each connection bump 1011 is connected to the battery cell 300 through a projection welding process, which is beneficial to strengthening the connection strength between the bus and the battery cell 300.

[0043] Specifically, four connection bumps 1011 are evenly spaced around the center of the connection portion 101. In practical applications, the connection bumps 1011 are evenly spaced, and the connection between the busbar and the battery cell 300 is achieved using a projection welding process. When the projection welding process is used, multiple connection bumps 1011 on a connection portion 101 can be welded at one time in one welding cycle. Since the distances between adjacent connection bumps 1011 are the same and the welding energy they receive is also the same, the uniformity of each welding point between the busbar and the battery cell 300 can be effectively improved, thereby facilitating further improving the welding quality.

[0044] In the embodiment of the present application, the thickness of the bus body 10 is a first thickness t. In actual applications, the first thickness t satisfies: 0.2mm≤t≤0.5mm; the height of the connecting bump 1011 protruding from the bus body 10 is a first height h, and the first height h satisfies: 1 / 2t≤h≤; the orthographic projection of the connecting bump 1011 on the bus body 10 is a circle, and the diameter of the connecting bump 1011 is a first diameter d, and the first diameter d satisfies: t≤d≤2t; the battery cell 300 has a positive cap 301, and the diameter of the positive cap 301 is a second diameter D. The distance between the connecting bump 1011 and the center of the connecting portion 101 is D1, and the distance D1 between the connecting bump 1011 and the center of the connecting portion 101 satisfies: d+0.5≤D1≤1 / 2(Dd).

[0045] In practical applications, the bus can be made of copper, aluminum, nickel, or copper-aluminum composite materials, copper-nickel composite materials, etc. The height and diameter of the connecting bump 1011 need to be determined according to the thickness of the bus body 10 to meet the different welding requirements between the battery cell 300 and the bus. In addition, attention should be paid to the selection of the bus material and thickness to meet the requirements of the bus resistance, temperature, etc. when the battery pack is working.

[0046] In the embodiment of the present application, the busbar further includes a conducting portion, and the conducting portion can be bendably connected to at least one connecting portion.

[0047] Specifically, the conductive part is a conductive part connected to the bus connecting part. The connecting part 101 of the conductive part and the bus can be an integrally formed structure, or can be welded to the connecting part 101, and the conductive part can be bent relative to the connecting part 101 of the bus. In actual applications, the conductive part is used to electrically connect to the protection plate 400 of the battery pack to achieve conduction of the circuit between the battery cell 300 and the protection plate 400, and the length of the conductive part needs to meet the electrical connection between the bus and the protection plate 400.

[0048] The present application also provides a battery pack. Figure 5 , showing an exploded view of the battery pack described in an embodiment of the present application; referring to Figure 6 , showing Figure 5Enlarged schematic diagram of part B in the middle; refer to Figure 7 , showing a cross-sectional view of the battery pack described in an embodiment of the present application; referring to Figure 8 , showing a cross-sectional view of the support block 500 according to an embodiment of the present application; Fig. 9 , shows a schematic diagram of the end structure of the support block 500 described in an embodiment of the present application.

[0049] like Figures 5 and 6 As shown, the battery pack may specifically include: a shell 200, and a plurality of battery cells 300, a protection plate 400, a support block 500 and the busbar as described above, which are arranged in the shell 200.

[0050] Specifically, the shell can be a heat shrink tubing. Compared with other materials, the heat shrink tubing has excellent flame retardant, environmental protection, insulation performance, elasticity, low shrinkage temperature, and fast shrinkage. The battery cell 300 extends along a first direction, and multiple battery cells 300 are arranged in an array along the first direction and the second direction to form a battery cell 300 module, wherein the multiple battery cells 300 arranged along the first direction are a row, and the multiple battery cells 300 arranged along the second direction are a column. In actual applications, multiple battery cells 300 can be arranged along the first direction, and the positive and negative poles of the multiple battery cells 300 are connected in sequence through a bus along the first direction. The bus is arranged at intervals along the first direction between adjacent battery cells 300 and between the battery cells 300 and the shell 200 to achieve series or parallel connection between the battery cells 300; wherein the first direction intersects with the second direction, and preferably, the first direction is perpendicular to the second direction, so that the multiple battery cells 300 can be arranged more regularly in the shell 200. In this way, when the size of the shell 200 is certain, more battery cells 300 can be arranged to increase the battery pack capacity, or, when the battery pack capacity requirements are met, the size of the shell 200 can also be reduced to save the layout space occupied by the battery pack.

[0051] Furthermore, a plurality of battery cells 300 may be arranged along the second direction, and a support block 500 may be arranged between adjacent battery cells 300, and the support block 500 may be fixed between two adjacent battery cells 300 by dispensing glue. In practical applications, compared with a battery pack structure in which no support block 500 is arranged between adjacent battery cells 300, when the battery cells 300 are connected to the protection plate 400, the arrangement of the support block 500 may reduce the risk of the protection plate 400 being skewed or even falling relative to the battery cells 300, making welding between the protection plate 400 and the battery cells 300 easier, which is conducive to improving production efficiency.

[0052] Specifically, the support block 500 extends in the first direction, the extension direction of the support block is consistent with the extension direction of the battery cell 300, and is arranged between two adjacent battery cells 300 arranged in the second direction. In practical applications, the length and position of the support block 500 can be freely set. For example, the length of the support block 500 in the first direction can be consistent with the length of the battery pack in the first direction, or can be consistent with the length of the battery cell 300 in the first direction, or can be less than the length of the battery cell 300 in the first direction. It can be understood that in the first direction, when the length of the support block 500 is consistent with the length of the battery pack, the support block 500 between adjacent columns of battery cells 300 can be set to only one, that is, to meet the support function of the protection plate 400 when the protection plate 400 is connected to the battery cell 300; when the length of the support block 500 is consistent with the length of the battery cell 300, or is less than the length of the battery cell 300, in each column of battery cells 300, at least one support block 500 is set between adjacent battery cells 300 spaced apart along the second direction, so as to meet the support function of the protection plate 400 when the protection plate 400 is connected to the battery cell 300.

[0053] In the embodiment of the present application, the support block 500 is also connected to the protection plate 400 along a third direction; wherein the third direction intersects with the first direction and the second direction, and preferably, the third direction is perpendicular to the first direction and the second direction.

[0054] Specifically, Figures 6 to 8 As shown, the cross-sectional shape of the support block 500 is similar to a triangle, wherein two sides of the support block 500 are connected to two adjacent battery cells 300, and one side is used to connect to the protection plate 400. In actual applications, the structural shape of this support block 500 is simpler, and the connection with the battery cell 300 is also more convenient. The use of this support block 500 in the battery pack can eliminate the battery cell 300 bracket structure currently commonly used in the battery pack, greatly reducing the space occupied by the bracket structure in the battery pack, and saving the time for making samples and opening molds for the battery cell 300 bracket, which is conducive to shortening the R&D cycle and improving product competitiveness. At the same time, it is also conducive to saving the development cost of the battery cell 300 bracket, making the product more advantageous in price. In addition, when the space for the protection plate 400 in the battery pack is limited, it may be necessary to add protection plates 400 on multiple sides of the battery cell 300 module. In this case, the protection plates 400 need to be welded one by one, resulting in low production efficiency and failure to meet the production requirements of automated equipment. The provision of the support block 500 facilitates the welding of the protection plate 400, improves the welding efficiency of the protection plate 400, and is beneficial to improving the overall production efficiency of the battery pack.

[0055] In the present application embodiment, Figure 8 , Fig. 9 As shown, the support block 500 is further provided with a positioning portion 501 , and the positioning portion 501 is used for positioning the support block 500 when connected to the protection plate 400 .

[0056] Specifically, the support block 500 is also provided with a positioning portion 501 extending along the third direction, and the protective plate 400 is provided with a positioning groove or positioning hole corresponding to the positioning portion 501. The positioning portion 501 of the support block 500 is embedded in the positioning groove or positioning hole of the protective plate 400 to achieve the positioning of the support block 500 connected to the protective plate 400. In practical applications, the support block 500 can be made of molten plastic, and the positioning portion 501 is a positioning column integrally formed with the support block 500. The positioning column can be fixed to the protective plate 400 by hot melting, or connected to the protective plate 400 by gluing. It should be noted that when the positioning column is fixed to the protective plate 400 by hot melting, the height of the positioning column relative to the top of the support block 500 can be greater than the distance between the top of the support block 500 and the protective bag; when the positioning column is fixed to the protective plate 400 by gluing, the height of the positioning column relative to the top of the support block 500 is less than the distance between the top of the support block 500 and the protective bag.

[0057] It can be understood that, due to the provision of the positioning column, the connection position between the protection plate 400 and the support block 500 is more precise, which indirectly helps to improve the assembly efficiency between the protection plate 400 and the battery cell 300.

[0058] In the embodiment of the present application, an insulating member 600 is further provided between the support block 500 and the protection plate 400, and a notch 601 is provided in the insulating member 600 at a position corresponding to the positioning portion 501 to provide an escape space for the positioning portion 501. Specifically, the insulating member 600 may be an insulating sheet, and the length of the insulating sheet along the first direction is not less than the length of the battery pack along the first direction, and the width of the insulating sheet along the second direction should be sufficient to completely isolate the protection plate 400 from the battery cell 300, and the provision of the insulating sheet can effectively prevent the battery pack from short-circuiting.

[0059] In practical applications, the battery pack assembly method may specifically include the following steps:

[0060] Step S1: confirming the distance D1 between the connection bump 1011 and the center of the connection portion 101 according to the model of the battery cell 300 to be welded;

[0061] Step S2: designing the height h and the diameter d of the connection bump 1011 according to the thickness t of the busbar body 10;

[0062] Step S3: placing the battery cell 300 into a welding fixture, and welding the first busbar 100 , the second busbar 100 , the third busbar 100 , etc., to the ends of the battery cell 300 by using a convex welding device;

[0063] Step S4: attaching protective foam to the ends of the battery cells 300 and folding two adjacent rows of battery cells 300 to obtain the required battery cell 300 module;

[0064] Step S5: assembling the support block 500 onto the battery cell 300 assembly by a jig, and attaching insulating sheets to both ends of the battery cell 300 module for insulation protection;

[0065] Step S6: Assemble the protection plate 400 onto the support block 500 , and fix the protection plate 400 onto the support block 500 by melting the positioning pins or gluing;

[0066] Step S7: attaching another layer of insulating sheet on the protection board 400 to insulate and protect the protection board 400 and the components on the protection board 400;

[0067] Step S8: Wrap with a heat shrink tubing to obtain a battery pack with a stable structure.

[0068] It should be noted that the battery pack obtained by the above assembly method has all the aforementioned advantages, which will not be described in detail here.

[0069] In the embodiment of the present application, a connection bump is provided on the connection portion of the busbar, and the connection bump can strengthen the connection between the busbar and the battery cell pole, effectively reduce the occurrence of cold welding, and ensure the quality of the battery pack; in addition, this busbar is suitable for the bump welding method to achieve the connection between the busbar and the battery cell. The bump welding method allows the busbar to weld multiple welding points at the same time in the same welding cycle, and the welding strength is uniform, which improves the production efficiency and enhances the stability of the welding quality. The setting of the circumferential annular groove of the bump is also conducive to collecting metal debris generated during welding, preventing metal debris from remaining on the surface of the busbar, resulting in an uneven welding surface, thereby affecting the welding quality of the battery pack.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A busbar, characterized in that: The busbar comprises: a busbar body and at least one connecting portion arranged on the busbar body, wherein the connecting portion is used to connect with the battery cell; wherein, The connecting portion is provided with a plurality of connecting protrusions and a plurality of annular grooves, and one of the annular grooves is arranged around one of the connecting protrusions.

2. The busbar according to claim 1, characterized in that: A plurality of connecting bumps are arranged at intervals around the center of the connecting portion.

3. The busbar according to claim 1, characterized in that: The thickness of the busbar body is a first thickness t, and the height of the connection protrusion protruding from the busbar body is a first height h; and the following conditions are satisfied: 1 / 2t≤h≤t.

4. The busbar according to claim 3, characterized in that: The orthographic projection of the connection protrusion on the busbar body is a circle, and the diameter of the connection protrusion is a first diameter d, satisfying: t≤d≤2t.

5. The busbar according to claim 4, characterized in that: The battery core has a positive electrode cap, the diameter of the positive electrode cap is a second diameter D, and the distance between the connection protrusion and the center of the connection portion is D1; ​​satisfying: d+0.5≤D1≤1 / 2(D-d).

6. The busbar according to claim 3, characterized in that: The first thickness satisfies: 0.2 mm ≤ t ≤ 0.5 mm.

7. The busbar according to any one of claims 1 to 6, characterized in that: The busbar further includes a conducting portion, and the conducting portion is bendably connected to at least one of the connecting portions.

8. A battery pack, characterized in that: The battery pack comprises: a shell, and a plurality of battery cells, a protection plate, a support block and a plurality of busbars according to any one of claims 1 to 7 arranged in the shell; wherein, The battery cells extend along a first direction, and a plurality of the battery cells are arranged in an array along the first direction and a second direction; the support block extends along the first direction and is arranged between two adjacent battery cells arranged along the second direction; a plurality of the bus bars are arranged at intervals along the first direction between adjacent battery cells and / or between the battery cells and the shell; wherein the first direction intersects with the second direction.

9. The battery pack according to claim 8, characterized in that: The support block is connected to the protection plate along a third direction; wherein the third direction intersects with the first direction and the second direction.

10. The battery pack according to claim 9, characterized in that: The support block is provided with a positioning portion, and the positioning portion is used for positioning the support block when connected to the protection plate.

11. The battery pack according to claim 10, characterized in that: An insulating member is further arranged between the support block and the protection plate. The insulating member is provided with a notch at a position corresponding to the positioning portion, and the notch is used to provide an escape space for the positioning portion.

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