A connection structure between battery pole and bus bar and battery module

Abstract

The present application provides a connection structure between a battery pole and a busbar and a battery module, which belongs to the field of battery technology. The connection structure between a battery pole and a busbar includes a battery pole, a busbar and a conductive member. The busbar is welded to the battery pole to form a welding joint, and the busbar and the battery pole are electrically connected through the welding joint. The conductive member is located between the battery pole and the busbar, so that the busbar and the battery pole are electrically connected through the conductive member. The busbar and the battery pole are electrically connected through both the welding joint and the conductive member, so that the current flow area between the battery pole and the busbar includes the conductive member in addition to the welding joint, which greatly increases the current flow area and greatly increases the current flow capacity between the battery pole and the busbar.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a connection structure between a battery pole and a bus bar and a battery module. Background Art

[0002] At present, the battery pole and the bus are usually connected by welding. The welding of the battery pole and the bus will form a welding joint. The battery pole and the bus are electrically connected through the welding joint. This structure makes the current carrying capacity between the battery pole and the bus poor and cannot meet the use requirements. Summary of the invention

[0003] The embodiments of the present application provide a connection structure between a battery pole and a bus bar and a battery module to improve the problem of poor current carrying capacity between the battery pole and the bus bar.

[0004] In a first aspect, an embodiment of the present application provides a connection structure between a battery pole and a bus bar, comprising a battery pole, a bus bar and a conductive member;

[0005] The busbar is welded to the battery pole to form a welded joint, and the busbar is electrically connected to the battery pole through the welded joint;

[0006] The conductive member is located between the battery pole and the bus bar, so that the bus bar and the battery pole are electrically connected through the conductive member.

[0007] In the above technical solution, the busbar and the battery pole are connected by welding, which has good firmness. The busbar and the battery pole are electrically connected through both the welding joint and the conductive member, so that the current flow area between the battery pole and the busbar includes the conductive member in addition to the welding joint, which greatly increases the current flow area and the current flow capacity between the battery pole and the busbar. In addition, since the setting of the conductive member increases the flow area between the battery pole and the busbar, the welding track between the battery pole and the busbar can be appropriately reduced to avoid the pole staying at high temperature for too long during the welding process, thereby ensuring the safety of the battery.

[0008] In addition, the connection structure between the battery pole and the busbar in the embodiment of the present application also has the following additional technical features:

[0009] In some embodiments of the present application, the conductive member is an adhesive layer;

[0010] The battery pole has a first bonding surface, and the busbar has a second bonding surface opposite to the first bonding surface;

[0011] The adhesive layer is fixedly connected to the first adhesive surface, and the adhesive layer is fixedly connected to the second adhesive surface.

[0012] In the above technical solution, the conductive member is an adhesive layer, the adhesive layer is fixedly connected to the first adhesive surface of the battery pole, and the adhesive layer is fixedly connected to the second adhesive surface of the bus bar, that is, the battery pole and the bus bar are bonded together by the adhesive layer, which further improves the firmness and shear strength of the battery pole and the bus bar after connection. In addition, since the conductive member is an adhesive layer, of course, the adhesive layer has conductivity, the adhesive layer has a large contact area with the first adhesive surface of the battery pole, and the adhesive layer also has a large contact area with the second adhesive surface of the bus bar, so that the battery pole and the adhesive layer have good current flow capacity, and the adhesive layer and the bus bar also have good current flow capacity, thereby ensuring the current flow capacity between the battery pole and the bus bar.

[0013] In some embodiments of the present application, a first receiving groove is provided on the first bonding surface;

[0014] The adhesive layer is formed by curing an adhesive, and the first receiving groove is configured to receive the adhesive.

[0015] In the above technical solution, the adhesive layer is formed by curing the adhesive. In the actual connection process, the liquid adhesive can be first applied to the first adhesive surface of the battery pole, and then the busbar is pressed on the adhesive. After the adhesive is cured into a solid, the busbar and the battery pole are bonded together. When the busbar is pressed, the busbar and the battery pole will squeeze the adhesive together, and the adhesive will flow between the busbar and the battery pole and enter the first receiving groove, thereby preventing excess adhesive from overflowing.

[0016] In some embodiments of the present application, the first accommodating groove is a first closed groove connected end to end, the first closed groove separates the first bonding surface into a first surface located on the inner side of the first closed groove and a second surface located on the outer side of the first closed groove, and the adhesive layer is fixedly connected to the first surface.

[0017] In the above technical solution, the first accommodating groove is a first closed groove connected end to end, and the adhesive layer is fixedly connected to the first surface located on the inner side of the first closed groove, that is, the adhesive before the adhesive layer is cured is located within the range of the first surface. When the bus and the battery pole squeeze the adhesive, the adhesive will flow into the first closed groove in any direction, which can more effectively prevent the adhesive from overflowing.

[0018] In some embodiments of the present application, the first closed groove is circular or polygonal.

[0019] In the above technical solution, the first closed groove is circular or polygonal. The first closed groove of this structure has a regular shape and is easy to process and manufacture.

[0020] In some embodiments of the present application, the weld joint is a closed structure connected end to end.

[0021] In the above technical solution, the welding joint is a closed structure connected end to end, which increases the contact area between the battery pole and the bus and the welding joint, further increases the flow area between the battery pole and the bus, and further improves the flow capacity.

[0022] In some embodiments of the present application, the first closed groove is located on the inner side of the end-to-end closed structure formed by the welded joint.

[0023] In the above technical solution, the first closed groove is located inside the closed structure of the welding joint. The first closed groove has a blocking effect on the adhesive, and the adhesive is not easy to flow to the welding area, thereby avoiding the adhesive from affecting the welding.

[0024] In some embodiments of the present application, the battery pole, the bus bar and the welding joint jointly define a closed space, and the adhesive layer is located in the closed space.

[0025] In the above technical solution, the battery pole, busbar and welding joint jointly define a closed space, and the adhesive layer is located in the closed space, that is, the adhesive layer is confined in the closed space. The scattered particles attached to the adhesive layer formed by the curing of the adhesive will not leak out to cause pollution, nor will it affect the pressure resistance performance of the battery.

[0026] In some embodiments of the present application, a second receiving groove is provided on the second bonding surface;

[0027] The adhesive layer is formed by curing an adhesive, and the second receiving groove is configured to receive the adhesive.

[0028] In the above technical solution, the second containing groove also has the ability to contain excess adhesive, thereby preventing the excess adhesive from overflowing.

[0029] In some embodiments of the present application, the second accommodating groove is a second closed groove connected end to end, the second closed groove separates the second bonding surface into a third surface located on the inner side of the second closed groove and a fourth surface located on the outer side of the second closed groove, and the bonding layer is fixedly connected to the third surface.

[0030] In the above technical solution, the second accommodating groove is a second closed groove connected end to end, and the adhesive layer is fixedly connected to the third surface located on the inner side of the second closed groove, that is, the adhesive before the adhesive layer is cured is located within the range of the third surface. When the bus and the battery pole squeeze the adhesive, the adhesive will flow into the second closed groove in any direction, which can more effectively prevent the adhesive from overflowing.

[0031] In some embodiments of the present application, the conductive member is an elastically deformable member;

[0032] The battery pole has a first contact surface, and the busbar has a second contact surface opposite to the first contact surface;

[0033] The elastic deformable member is squeezed between the first contact surface and the second contact surface, and the elastic deformable member has a tendency to recover the deformation, so that the elastic deformable member is in close contact with the first contact surface, and the elastic deformable member is in close contact with the second contact surface.

[0034] In the above technical solution, the elastic deformable member is squeezed between the first contact surface and the second contact surface, the elastic deformable member is elastically deformed and compressed, and the elastic deformable member has a tendency to recover the deformation, so that the elastic deformable member is in close contact with the first contact surface of the battery pole, and the elastic deformable member is in close contact with the second contact surface of the bus bar, so that the battery pole and the elastic deformable member have good flow capacity, and the elastic deformable member and the bus bar also have good flow capacity, thereby ensuring the flow capacity between the battery pole and the bus bar. In addition, since the elastic deformable member is deformed and applies elastic force to both the battery pole and the bus bar, the elastic deformable member is not easy to fall off from the gap between the battery pole and the bus bar. When the battery pole and the bus bar are connected, the elastic deformable member is first placed between the battery pole and the bus bar, and pressure is applied to the bus bar to squeeze the elastic deformable member so that the elastic deformable member is squeezed and deformed, and then the battery pole and the bus bar are welded together, so that the connection between the battery pole and the bus bar is completed, and the operation is simple and convenient.

[0035] In some embodiments of the present application, the elastic deformable member includes a first conductor, a second conductor and an elastic conductor unit;

[0036] The first conductor and the second conductor are arranged opposite to each other, and the elastic conductor unit is connected between the first conductor and the second conductor;

[0037] The elastic conductor unit has a tendency to restore elastic deformation so that the first conductor is in close contact with the first contact surface and the second conductor is in close contact with the second contact surface.

[0038] In the above technical solution, the elastic conductive unit is an object that can undergo elastic deformation. Under the action of the elastic force of the elastic conductive unit, the first conductor is in close contact with the first contact surface of the battery pole, and the second conductor is in close contact with the second contact surface of the bus. The elastic deformable part of this structure has good elastic deformation ability.

[0039] In some embodiments of the present application, the elastic deformation member includes a first conductive portion, a second conductive portion, and a third conductive portion connected in sequence;

[0040] The first conductive portion has a tendency to recover its bending deformation relative to the second conductive portion, so that the first conductive portion is in close contact with the first contact surface;

[0041] The third conductive portion has a tendency to recover the bending deformation relative to the second conductive portion, so that the third conductive portion is in close contact with the second contact surface.

[0042] In the above technical solution, the first conductive part and the third conductive part both have the ability to recover bending deformation, so that the first conductive part is in close contact with the first contact surface of the battery pole, and the third conductive part is in close contact with the second contact surface of the bus. The elastic deformable part of this structure is simple in structure and has good elastic deformation ability.

[0043] In a second aspect, an embodiment of the present application provides a battery module, including a bus bar and a plurality of batteries, each battery having a battery pole;

[0044] The battery poles of each two adjacent batteries are connected by the busbar so that the multiple batteries are connected in series; or

[0045] connecting the plurality of batteries in parallel; or

[0046] Connecting some of the batteries in parallel and then connecting them in series with the remaining batteries in the batteries;

[0047] A conductive member is provided between the battery pole and the bus bar, and the battery pole, the bus bar and the conductive member constitute the above-mentioned connection structure between the battery pole and the bus bar.

[0048] In the above technical solution, the busbar and the battery pole are electrically connected through both the welding joint and the conductive member, so that the current flow area between the battery pole and the busbar includes the conductive member in addition to the welding joint, which greatly increases the current flow area and the current flow capacity between the battery pole and the busbar. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 A schematic diagram of a connection structure between a battery pole and a bus bar provided in some embodiments of the present application;

[0051] Figure 2A schematic diagram of the structure of a welding joint provided in some embodiments of the present application;

[0052] Figure 3 A schematic diagram of the structure of a welding joint provided in other embodiments of the present application;

[0053] Figure 4 A schematic diagram of the structure of a first receiving groove on a battery pole provided in some embodiments of the present application;

[0054] Figure 5 A schematic diagram of the structure of a first receiving groove on a battery pole provided in other embodiments;

[0055] Figure 6 A schematic diagram of a connection structure between a battery pole and a bus bar provided in some other embodiments of the present application;

[0056] Figure 7 A schematic diagram of a connection structure between a battery pole and a bus bar provided in other embodiments of the present application;

[0057] Figure 8 A schematic diagram of a connection structure between a battery pole and a bus bar in a first situation provided in some further embodiments of the present application;

[0058] Fig. 9 A schematic diagram of a connection structure between a battery pole and a bus bar in a second situation provided in some further embodiments of the present application;

[0059] Fig.10 A schematic diagram of the structure of a battery module in a first situation provided in some embodiments of the present application;

[0060] Fig.11 A schematic diagram of the structure of a battery module in a second situation provided in some embodiments of the present application;

[0061] Fig.12 A schematic diagram of the structure of a battery module in the third case provided for some embodiments of the present application.

[0062] Icons: 100-connection structure between battery pole and bus; 10-battery pole; 11-first bonding surface; 111-first surface; 112-second surface; 12-first closed groove; 13-first contact surface; 20-bus; 21-second bonding surface; 211-third surface; 212-fourth surface; 22-second closed groove; 23-second contact surface; 30-conductive member; 31-adhesive layer; 32-elastic deformation member; 321-first conductor; 322-second conductor; 323-elastic conductor unit; 324-first conductive part; 325-second conductive part; 326-third conductive part; 40-welding joint; 50-enclosed space; 200-battery module; 210-battery; 211-first battery; 212-second battery; 213-third battery. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0064] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0065] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0066] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0067] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0068] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] Example

[0070] like Figure 1 As shown, the embodiment of the present application provides a connection structure 100 between a battery pole and a busbar, comprising a battery pole 10, a busbar 20 and a conductive member 30. The busbar 20 is welded to the battery pole 10 to form a welded joint 40, and the busbar 20 is electrically connected to the battery pole 10 through the welded joint 40. The conductive member 30 is located between the battery pole 10 and the busbar 20, so that the busbar 20 is electrically connected to the battery pole 10 through the conductive member 30.

[0071] The busbar 20 is welded to the battery pole 10 to form a welded joint 40. The busbar 20 is electrically connected to the battery pole 10 through the welded joint 40, that is, the busbar 20 and the battery pole 10 form a welded joint 40 with conductivity during the welding process, and the current on the battery pole 10 can be transmitted to the busbar 20 through the welded joint 40. The busbar 20 is electrically connected to the battery pole 10 through the conductive member 30, that is, the conductive member 30 has conductivity, and the current on the battery pole 10 can be transmitted to the busbar 20 through the conductive member 30.

[0072] The busbar 20 is connected to the battery pole 10 by welding, and has good firmness. The busbar 20 is electrically connected to the battery pole 10 through both the welding joint 40 and the conductive member 30, so that the current flow area between the battery pole 10 and the busbar 20 includes the conductive member 30 in addition to the welding joint 40, which greatly increases the current flow area and the flow capacity between the battery pole 10 and the busbar 20. In addition, since the setting of the conductive member 30 increases the flow area between the battery pole 10 and the busbar 20, the welding track between the battery pole 10 and the busbar 20 can be appropriately reduced to prevent the pole from staying at high temperature for too long during the welding process, thereby ensuring the safety of the battery.

[0073] It is understandable that the battery pole 10 and the bus bar 20 are both made of conductive materials, such as copper, iron, aluminum, etc.

[0074] The busbar 20 and the battery pole 10 can be welded in a variety of ways, as long as the busbar 20 and the battery pole 10 can be connected and fixed, and the current transmission between the two can be achieved. In this embodiment, the busbar 20 and the battery pole 10 are welded by laser penetration welding, with the laser as the heat source. The laser penetrates the busbar 20 and reaches the battery pole 10, and partially melts the battery pole 10. The molten liquid eventually cools to form a permanent connection. Figure 1 After the melt is cooled, a weld joint 40 is formed, which penetrates the busbar 20 and partially sinks into the battery pole 10. Since the busbar 20 and the battery pole 10 are welded by laser penetration welding, the welding speed is fast, and the welding process can ensure that the battery pole 10 stays at a high temperature for a very short time, which can avoid adverse effects on the inside of the battery.

[0075] It should be noted that when the busbar 20 and the battery pole 10 are welded by laser penetration welding, the welding trajectory can be a continuous trajectory or a discontinuous trajectory. Among them, the continuous trajectory can be formed by welding along a straight trajectory, a curved trajectory, or a closed trajectory.

[0076] In this embodiment, the welding track is a continuous track, and welding is performed according to a closed track to form a welding joint 40 connecting the busbar 20 and the battery pole 10. Figure 2 As shown, after the busbar 20 and the battery pole 10 are welded according to a closed trajectory, the welding joint 40 connecting the busbar 20 and the battery pole 10 is a closed structure connected end to end. Optionally, the welding joint 40 is a ring structure. In other embodiments, the welding structure can also be other closed structures, such as polygonal.

[0077] The welding joint 40 is a closed structure connected end to end, which increases the contact area between the battery pole 10 and the bus bar 20 and the welding joint 40, further increases the flow area between the battery pole 10 and the bus bar 20, and further improves the flow capacity.

[0078] In other embodiments, the welding track may also be a discontinuous track, so that a plurality of welding joints 40 are formed between the battery pole 10 and the busbar 20. Figure 3 As shown, a plurality of weld joints 40 are spaced apart around the circumference.

[0079] The conductive member 30 performs a conductive function between the battery pole 10 and the bus bar 20 . The conductive member 30 is made of a conductive material and can have a variety of structures.

[0080] In some embodiments of the present application, continue to refer to Figure 1, the conductive member 30 is an adhesive layer 31. The battery pole 10 has a first adhesive surface 11, and the busbar 20 has a second adhesive surface 21 opposite to the first adhesive surface 11. The adhesive layer 31 is fixedly connected to the first adhesive surface 11, and the adhesive layer 31 is fixedly connected to the second adhesive surface 21.

[0081] The conductive member 30 is an adhesive layer 31, and the adhesive layer 31 is fixedly connected to the first adhesive surface 11 of the battery pole 10, and the adhesive layer 31 is fixedly connected to the second adhesive surface 21 of the bus bar 20, that is, the battery pole 10 and the bus bar 20 are bonded together by the adhesive layer 31, which further improves the firmness and shear strength of the battery pole 10 and the bus bar 20 after being connected. In addition, since the conductive member 30 is an adhesive layer 31, of course, the adhesive layer 31 has conductivity, and the adhesive layer 31 has a large contact area with the first adhesive surface 11 of the battery pole 10, and the adhesive layer 31 also has a large contact area with the second adhesive surface 21 of the bus bar 20, so that the battery pole 10 and the adhesive layer 31 have good current flow capacity, and the adhesive layer 31 and the bus bar 20 also have good current flow capacity, thereby ensuring the current flow capacity between the battery pole 10 and the bus bar 20.

[0082] It should be noted that the first bonding surface 11 of the battery pole 10 and the second bonding surface 21 of the busbar 20 can be a plane or a curved surface. In this embodiment, in order to improve the bonding ability of the bonding layer 31 with the first bonding surface 11 and the second bonding surface 21, the first bonding surface 11 and the second bonding surface 21 are planes.

[0083] The adhesive layer 31 is formed by curing an adhesive, and the adhesive has conductivity, so that the cured adhesive layer 31 has conductivity. In this embodiment, the adhesive is conductive glue.

[0084] In the actual connection process, the liquid adhesive can be applied to the first bonding surface 11 of the battery pole 10, and then the busbar 20 is pressed on the adhesive. After the adhesive is cured into a solid, the busbar 20 and the battery pole 10 are bonded together. Of course, the adhesive can also be applied to the second bonding surface 21 of the busbar 20, and then the busbar 20 and the adhesive are pressed together on the battery pole 10. After the adhesive layer 31 bonds the busbar 20 and the battery pole 10 together, the busbar 20 and the battery pole 10 are welded to form a welded joint 40.

[0085] During the bonding process, when the busbar 20 is pressed, the busbar 20 and the battery pole 10 will squeeze the adhesive together, and the adhesive will flow between the busbar 20 and the battery pole 10 , and the adhesive will easily overflow from the gap between the busbar 20 and the battery pole 10 .

[0086] In some embodiments of the present application, a first receiving groove is provided on the first bonding surface 11 , and the first receiving groove is configured to receive an adhesive.

[0087] When the busbar 20 is pressed, the adhesive flows between the busbar 20 and the battery pole 10 and enters the first receiving groove, thereby preventing excess adhesive from overflowing and reducing the impact of the overflowed adhesive on the battery performance.

[0088] The first receiving groove can be a groove of various shapes arranged on the first bonding surface 11. The first receiving groove can be a closed groove or a non-closed groove (a strip groove, an arc groove, etc.), as long as the first receiving groove can accommodate excess adhesive.

[0089] In some embodiments of the present application, Figure 4 As shown, the first accommodating groove is a first closed groove 12 connected end to end, and the first closed groove 12 separates the first bonding surface 11 into a first surface 111 located on the inner side of the first closed groove 12 and a second surface 112 located on the outer side of the first closed groove 12, and the adhesive layer 31 is fixedly connected to the first surface 111.

[0090] The first receiving groove is a first closed groove 12 connected end to end, and the adhesive layer 31 is fixedly connected to the first surface 111 located on the inner side of the first closed groove 12, that is, the adhesive before the adhesive layer 31 is cured is located within the range of the first surface 111. When the bus 20 and the battery pole 10 squeeze the adhesive, the adhesive will flow into the first closed groove 12 in any direction, which can more effectively prevent the adhesive from overflowing.

[0091] Furthermore, in this embodiment, the first closed groove 12 is a circular groove. The first closed groove 12 of this structure has a regular shape and is easy to process and manufacture.

[0092] In other embodiments, the first closed groove 12 may also be in other shapes, for example, the first closed groove 12 is a polygonal groove. Figure 5 As shown, in one non-limiting example, the first closed slot 12 is a rectangular slot.

[0093] In some embodiments of the present application, continue to refer to Figure 1 The first closed groove 12 is located inside the closed structure of the end-to-end connection formed by the welding joint 40. In other words, the welding track between the battery pole 10 and the busbar 20 is located outside the first closed groove 12. Since the first closed groove 12 has a blocking effect on the adhesive, the adhesive is not easy to flow to the welding area, thereby avoiding the adhesive from affecting the welding.

[0094] When the welding joint 40 is a closed structure connected end to end, and the welding joint 40 penetrates the bus bar 20 and partially sinks into the battery pole 10, the battery pole 10, the bus bar 20 and the welding joint 40 together define a closed space 50. In this embodiment, the adhesive layer 31 is located in the closed space 50, that is, the conductive member 30 is confined in the closed space 50.

[0095] When the adhesive is cured between the battery pole 10 and the bus bar 20 to form the adhesive layer 31, scattered particles will be formed to cause pollution, and the scattered particles may also cause the battery to fail to meet the high-voltage resistance requirements. However, the adhesive layer 31 is located in the closed space 50, and the scattered particles attached to the adhesive layer 31 formed by the curing of the adhesive will not leak out to cause pollution, nor will it affect the pressure resistance of the battery.

[0096] In some of the above embodiments, the first receiving groove on the first bonding surface 11 of the battery pole 10 is limited by its depth, so that the receiving capacity of the first receiving groove is limited. If too much adhesive is applied, the excess adhesive may still overflow after filling the first receiving groove.

[0097] Therefore, in order to improve the capacity of the adhesive, in some embodiments of the present application, such as Figure 6 As shown, a second receiving groove is provided on the second bonding surface 21, and the second receiving groove is configured to receive adhesive. During the bonding process between the busbar 20 and the battery pole 10, when the busbar 20 is squeezed, the second receiving groove also has the ability to receive excess adhesive, and the excess adhesive can also flow into the second receiving groove, thereby preventing the excess adhesive from overflowing.

[0098] Of course, the second receiving groove can be a groove of various shapes arranged on the second bonding surface 21. The second receiving groove can be a closed groove or a non-closed groove (strip groove, arc groove, etc.), as long as the second receiving groove can accommodate excess adhesive.

[0099] In some embodiments of the present application, the second accommodating groove is a second closed groove 22 connected end to end, and the second closed groove 22 separates the second bonding surface 21 into a third surface 211 located on the inner side of the second closed groove 22 and a fourth surface 212 located on the outer side of the second closed groove 22, and the adhesive layer 31 is fixedly connected to the third surface 211.

[0100] The second receiving groove is a second closed groove 22 connected end to end, and the adhesive layer 31 is fixedly connected to the third surface 211 located on the inner side of the second closed groove 22, that is, the adhesive before the adhesive layer 31 is cured is located within the range of the third surface 211. When the bus 20 and the battery pole 10 squeeze the adhesive, the adhesive will flow into the second closed groove 22 in any direction, which can more effectively prevent the adhesive from overflowing.

[0101] Of course, the second closed groove 22 can also be a closed structure of various shapes, for example, the second closed groove 22 is a circular groove, a polygonal groove, etc. In order to ensure that the adhesive can better enter the first closed groove 12 and the second closed groove 22 during the process of squeezing the adhesive between the busbar 20 and the battery pole 10, the shape and size of the first closed groove 12 and the second closed groove 22 are set to be consistent, and the two are aligned. Taking the first closed groove 12 and the second closed groove 22 as circular grooves as an example, the two are equal in size and aligned, that is, the axial projections of the two coincide.

[0102] In some of the above embodiments, Figure 1 As shown, only the first bonding surface 11 of the battery pole 10 is provided with a first receiving groove; in some of the above embodiments, such as Figure 6 As shown, the first bonding surface 11 of the battery pole 10 is provided with a first receiving groove, and the second bonding surface 21 of the busbar 20 is provided with a second receiving groove. Figure 7 As shown, the second receiving groove may be provided only on the second bonding surface 21 of the busbar 20 .

[0103] In some of the above embodiments, the conductive member 30 between the battery pole 10 and the bus bar 20 is an adhesive layer 31, that is, the conductive member 30 and the battery pole 10 are fixedly connected, and the conductive member 30 and the bus bar 20 are also fixedly connected. Of course, the conductive member 30 may also be other structures, and the conductive member 30 and the battery pole 10 and the bus bar 20 may also be connected in other ways.

[0104] In some embodiments of the present application, Figure 8 As shown, the conductive member 30 is an elastic deformable member 32. The battery pole 10 has a first contact surface 13, and the busbar 20 has a second contact surface 23 opposite to the first contact surface 13. The elastic deformable member 32 is squeezed between the first contact surface 13 and the second contact surface 23, and the elastic deformable member 32 has a tendency to recover the deformation, so that the elastic deformable member 32 is in close contact with the first contact surface 13, and the elastic deformable member 32 is in close contact with the second contact surface 23.

[0105] The elastic deformable member 32 is squeezed between the first contact surface 13 and the second contact surface 23, and the elastic deformable member 32 is elastically deformed and compressed, and the elastic deformable member 32 has a tendency to recover the deformation, so that the elastic deformable member 32 is in close contact with the first contact surface 13 of the battery pole 10, and the elastic deformable member 32 is in close contact with the second contact surface 23 of the bus 20, so that the battery pole 10 and the elastic deformable member 32 have good flow capacity, and the elastic deformable member 32 and the bus 20 also have good flow capacity, thereby ensuring the flow capacity between the battery pole 10 and the bus 20. In addition, because the elastic deformable member 32 is deformed and applies elastic force to both the battery pole 10 and the bus 20, the elastic deformable member 32 is not easy to fall off from the gap between the battery pole 10 and the bus 20. When connecting the battery post 10 and the bus bar 20, first place the elastic deformable member 32 between the battery post 10 and the bus bar 20, and apply pressure to the bus bar 20 to squeeze the elastic deformable member 32 so that the elastic deformable member 32 is squeezed and deformed, and then weld the battery post 10 and the bus bar 20 together to complete the connection between the battery post 10 and the bus bar 20. The operation is simple and convenient.

[0106] When the welding joint 40 is a closed structure connected end to end, and the welding joint 40 penetrates the bus bar 20 and partially sinks into the battery pole 10, the battery pole 10, the bus bar 20 and the welding joint 40 together define a closed space 50. In this embodiment, the elastic deformation member 32 is located in the closed space 50, that is, the conductive member 30 is confined in the closed space 50.

[0107] In some embodiments of the present application, continue to refer to Figure 8 The elastic deformable member 32 includes a first conductor 321, a second conductor 322 and an elastic conductor unit 323. The first conductor 321 and the second conductor 322 are arranged opposite to each other, and the elastic conductor unit 323 is connected between the first conductor 321 and the second conductor 322. The elastic conductor unit 323 has a tendency to restore elastic deformation, which can be understood as the elastic conductor unit 323 is in a compressed state, so that the first conductor 321 is in close contact with the first contact surface 13, and the second conductor 322 is in close contact with the second contact surface 23.

[0108] The elastic conductive unit is an object that can undergo elastic deformation. Under the action of the elastic force of the elastic conductive unit, the first conductor 321 is in close contact with the first contact surface 13 of the battery pole 10, and the second conductor 322 is in close contact with the second contact surface 23 of the bus 20. The elastic deformable part 32 of this structure has good elastic deformation ability.

[0109] The first conductor 321, the second conductor 322 and the elastic conductor unit 323 are all conductive, and the first conductor 321 and the second conductor 322 are electrically connected through the elastic conductor. In this embodiment, the first conductor 321 and the second conductor 322 are both thin plate structures, the elastic conductor unit 323 is a spring, the first conductor 321, the second conductor 322 and the elastic conductor unit 323 are all made of metal, and the elastic conductor unit 323 is connected to the first conductor 321 and the second conductor 322 by welding. Under the elastic force of the elastic conductor unit 323, one surface of the first conductor 321 is in close contact with the first contact surface 13, and one surface of the second conductor 322 is in close contact with the second contact surface 23.

[0110] It should be noted that there may be one or more elastic conductor units 323 between the first conductor 321 and the second conductor 322. In this embodiment, there are multiple elastic conductor units 323, and multiple elastic conductor rectangular arrays are distributed between the first conductor 321 and the second conductor 322, so that multi-point support is formed between the first conductor 321 and the second conductor 322, so as to improve the stability of the first conductor 321 and the second conductor 322 in the process of approaching or moving away from each other, and at the same time improve the flow area between the first conductor 321 and the second conductor 322.

[0111] Of course, the elastic deformation member 32 may also be other structures. In some embodiments of the present application, such as Fig. 9 As shown, the elastic deformable member 32 includes a first conductive portion 324, a second conductive portion 325 and a third conductive portion 326 connected in sequence. The first conductive portion 324 has a tendency to restore the bending deformation relative to the second conductive portion 325, so that the first conductive portion 324 is in close contact with the first contact surface 13. The third conductive portion 326 has a tendency to restore the bending deformation relative to the second conductive portion 325, so that the third conductive portion 326 is in close contact with the second contact surface 23.

[0112] Both the first conductive part 324 and the third conductive part 326 have the ability to recover bending deformation, so that the first conductive part 324 is in close contact with the first contact surface 13 of the battery pole 10, and the third conductive part 326 is in close contact with the second contact surface 23 of the bus 20. The elastic deformable part 32 of this structure is simple in structure and has good elastic deformation ability.

[0113] Among them, the first conductive part 324, the second conductive part 325 and the third conductive part 326 are formed by bending a sheet member with conductive ability, so that the first conductive part 324 and the second conductive part 325 are set at an angle, and the second conductive part 325 and the third conductive part 326 are set at an angle. In this embodiment, the angle between the first conductive part 324 and the second conductive part 325 is an acute angle, and the angle between the second conductive part 325 and the third conductive part 326 is a blunt angle. In the process of squeezing the elastic deformation part 32 by the battery pole 10 and the bus 20, the distance between the first conductive part 324 and the second conductive part 325 will be close to each other, and the angle between the first conductive part 324 and the second conductive part 325 will be reduced, so that the first conductive part 324 has a tendency to recover the bending deformation, and the angle between the second conductive part 325 and the third conductive part 326 will increase, so that the third conductive part 326 has a tendency to recover the bending deformation.

[0114] It should be noted that, in addition to the structures in the above two embodiments, the elastic deformable member 32 may also be other structures. For example, the elastic deformable member 32 is a flat plate structure that has both elasticity and conductivity.

[0115] In addition, the embodiment of the present application further provides a battery module 200 , including a bus bar 20 and a plurality of batteries 210 , each battery 210 having a battery pole 10 .

[0116] The battery poles 10 of each two adjacent batteries 210 are connected by a bus bar 20 so that a plurality of batteries 210 are connected in series; or

[0117] Connect multiple batteries 210 in parallel; or

[0118] Some of the batteries 210 among the plurality of batteries 210 are connected in parallel, and then connected in series with the remaining batteries 210 among the plurality of batteries 210 .

[0119] A conductive member 30 is provided between the battery pole 10 and the bus bar 20 . The battery pole 10 , the bus bar 20 and the conductive member 30 constitute a connection structure 100 between the battery pole and the bus bar in any of the above embodiments.

[0120] The busbar 20 and the battery pole 10 are electrically connected through the welding joint 40 and the conductive member 30, so that the current flow area between the battery pole 10 and the busbar 20 includes the conductive member 30 in addition to the welding joint 40, which greatly increases the current flow area and the current flow capacity between the battery pole 10 and the busbar 20.

[0121] The following combination Figure 10-12 Three connection modes of the battery 210 in the battery module 200 are described in detail.

[0122] like Fig.10 As shown, the battery poles 10 of every two adjacent batteries 210 in the battery module 200 are connected by a bus bar 20 so that all the batteries 210 are connected in series. In this case, the batteries 210 in the battery module 200 can be two or more than two. In a non-limiting example, there are three batteries 210 in the battery module 200. For the convenience of description, the three batteries 210 are defined as a first battery 211, a second battery 212, and a third battery 213. The battery pole 10 of the first battery 211 with a positive polarity is connected with the battery pole 10 of the second battery 212 with a negative polarity through a bus bar 20, thereby realizing the series connection of the first battery 211 and the second battery 212; the battery pole 10 of the third battery 213 with a negative polarity is connected with the battery pole 10 of the second battery 212 with a positive polarity through a bus bar 20, thereby realizing the series connection of the second battery 212 and the third battery 213, and finally realizing the series connection of three batteries 210. The first battery 211 has a negative polarity battery post 10 as the negative electrode of the battery module 200, and the third battery 213 has a positive polarity battery post 10 as the positive electrode of the battery module 200. The specific connection form of the busbar 20 and the battery post 10 refers to the connection structure 100 of the battery post and the busbar in any of the above embodiments, which will not be repeated here.

[0123] like Fig.11 As shown, the battery poles 10 of every two adjacent batteries 210 in the battery module 200 are connected by a bus 20 so that all the batteries 210 are connected in parallel. In this case, the number of batteries 210 in the battery module 200 can be two or more. In a non-limiting example, there are three batteries 210 in the battery module 200, and the battery poles 10 of all the batteries 210 with positive polarity are connected together by the bus 20 as a whole as the positive electrode of the battery module 200, and the battery poles 10 of all the batteries 210 with negative polarity are connected together by the bus 20 as a whole as the negative electrode of the battery module 200, thereby realizing the parallel connection of three batteries 210. Of course, the battery poles 10 of the three batteries 210 with positive polarity can be connected together through a bus bar 20, or every two adjacent battery poles 10 with positive polarity can be connected together through a bus bar 20; the battery poles 10 of the three batteries 210 with negative polarity can also be connected together through a bus bar 20, or every two adjacent battery poles 10 with negative polarity can be connected together through a bus bar 20. The specific connection form of the bus bar 20 and the battery pole 10 refers to the connection structure 100 of the battery pole and the bus bar in any of the above embodiments, which will not be repeated here.

[0124] like Fig.12As shown, the battery poles 10 of every two adjacent batteries 210 in the battery module 200 are connected by a bus bar 20, so that some of the batteries 210 in the battery module 200 are connected in parallel and then connected in series with the remaining batteries 210. In this case, there are at least three batteries 210 in the battery module 200. In a non-limiting example, there are three batteries 210 in the battery module 200. For the convenience of description, the three batteries 210 are defined as a first battery 211, a second battery 212, and a third battery 213. The battery pole 10 with positive polarity of the first battery 211 and the battery pole 10 with positive polarity of the second battery 212 are connected together through a bus 20 as a whole as the positive electrode of the battery module 200, and the battery pole 10 with negative polarity of the first battery 211 and the battery pole 10 with negative polarity of the second battery 212 are connected together through a bus 20, thereby realizing the parallel connection of the first battery 211 and the second battery 212; the battery pole 10 with positive polarity of the third battery 213 and the battery pole 10 with negative polarity of the second battery 212 are connected together through a bus 20, thereby realizing the parallel connection of the first battery 211 and the second battery 212 and then the series connection with the third battery 213, and the battery pole 10 with negative polarity of the third battery 213 serves as the negative electrode of the battery module 200. It should be noted that the busbar 20 connecting the battery pole 10 with the negative polarity of the first battery 211 and the battery pole 10 with the negative polarity of the second battery 212 and the busbar 20 connecting the battery pole 10 with the positive polarity of the third battery 213 and the battery pole 10 with the negative polarity of the second battery 212 can be the same busbar 20. The specific connection form of the busbar 20 and the battery pole 10 refers to the connection structure 100 of the battery pole and the busbar in any of the above embodiments, which will not be repeated here.

[0125] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A connection structure between a battery pole and a busbar, characterized in that: include: Battery terminals; A busbar, wherein the busbar is welded to the battery pole to form a welded joint, the busbar and the battery pole are electrically connected through the welded joint, the welded joint penetrates the busbar and partially sinks into the battery pole, and a gap is formed between the busbar and the battery pole; and A conductive member, the conductive member is located in the gap between the battery pole and the bus bar, so that the bus bar and the battery pole are electrically connected through the conductive member; The conductive member is an elastic deformable member; the battery pole has a first contact surface, and the bus has a second contact surface opposite to the first contact surface; the elastic deformable member is squeezed between the first contact surface and the second contact surface; the elastic deformable member includes a first conductor, a second conductor and an elastic conductor unit, the first conductor and the second conductor are arranged opposite to each other, and the elastic conductor unit is connected between the first conductor and the second conductor; the elastic conductor unit has a tendency to restore elastic deformation so that the first conductor is in close contact with the first contact surface, and the second conductor is in close contact with the second contact surface, and the elastic conductor unit is a spring.

2. A battery module, characterized in that: include: a plurality of batteries, each battery having a battery terminal; as well as A bus bar, through which the battery poles of each two adjacent batteries are connected, so that the plurality of batteries are connected in series; or connecting the plurality of batteries in parallel; or Connecting some of the batteries in parallel and then connecting them in series with the remaining batteries in the batteries; A conductive member is provided between the battery pole and the busbar, and the battery pole, the busbar and the conductive member constitute the connection structure of the battery pole and the busbar according to claim 1.

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