Integrated busbar and battery pack structure

Abstract

The utility model discloses an integrated busbar and a battery pack structure. The integrated busbar comprises a bracket, a plurality of conductive plates and a circuit board, the plurality of conductive plates are mounted on one surface of the bracket and are arranged at intervals; the edge of the circuit board is convexly provided with a plurality of electric connection convex lugs which are arranged at intervals, the electric connection convex lugs and a conductive layer in the circuit board are integrally formed, and one end, far away from the circuit board, of each electric connection convex lug is correspondingly welded with each conductive plate. According to the integrated busbar, the edge of the circuit board is provided with the plurality of electric connection lugs, the electric connection lugs and the conductive layer in the circuit board are integrally formed, the electric connection lugs and the conductive plate are correspondingly welded to realize circuit series connection, and in the manufacturing process, one connection part of the circuit board and the conductive plate only needs to be welded once, so that the manufacturing cost is reduced. Welding points are fewer, the welding point failure risk can be reduced, the machining procedure and the detection procedure are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an integrated busbar and a battery pack structure. Background Art

[0002] The integrated busbar is a conductive component that connects multiple battery cells and is mainly used in automotive batteries. The integrated busbar includes a bracket, multiple conductive plates installed on the bracket, and a circuit board. The circuit board connects multiple conductive plates. One conductive plate is used to connect to one battery cell, thereby integrating multiple battery cells together.

[0003] However, in the existing integrated busbar, the circuit board and the conductive plate are electrically connected by welding nickel sheets. This structure requires welding of both ends of the nickel sheet during the processing process. In addition, different welding methods are suitable for welding the nickel sheet to different materials. The process is relatively cumbersome and complicated, and the quality of two-point welding needs to be guaranteed. The process is difficult and the product defect rate is high. Utility Model Content

[0004] The main purpose of the utility model is to provide an integrated busbar, aiming to improve the connection mode between the circuit board and the conductive sheet and reduce the process difficulty.

[0005] In order to achieve the above object, the utility model provides an integrated busbar, comprising:

[0006] Bracket;

[0007] A plurality of conductive plates, wherein the plurality of conductive plates are mounted on a surface of the bracket and arranged at intervals; and

[0008] A circuit board, wherein a plurality of spaced electrical connection lugs are protruding from the edge of the circuit board, the electrical connection lugs are integrally formed with the conductive layer in the circuit board, and one end of each electrical connection lug away from the circuit board is correspondingly welded to each conductive plate.

[0009] In some embodiments of the present invention, the electrical connection lug has a fixed end close to the edge of the circuit board and a free end away from the edge of the circuit board, the fixed end is at least partially bent, and the free end is welded to the conductive plate.

[0010] In some embodiments of the present invention, the circuit board includes a main body plate portion and a plurality of connecting plate portions protruding from the edge of the main body plate portion, the connecting plate portions cooperate with the conductive plate, and the electrical connection lugs are formed on the edges of the connecting plate portions.

[0011] In some embodiments of the present invention, at least one side of the conductive plate is provided with an assembly groove, and the connecting plate portion is assembled in the assembly groove.

[0012] In some embodiments of the present invention, the circuit board is provided with a temperature detection module, and the temperature detection module is located on a side of the connecting plate portion facing away from the conductive plate.

[0013] In some embodiments of the present invention, at least part of the conductive plate includes a positive plate portion and a negative plate portion connected to each other, the positive plate portion is used to connect the positive electrode of the battery cell, and the negative plate portion is used to connect the negative electrode of the battery cell;

[0014] Each of the connecting plate portions is provided with a pair of electrical connection lugs, and the positive plate portion and the negative plate portion are both connected with a pair of electrical connection lugs.

[0015] In some embodiments of the present invention, the connection between the positive electrode plate portion and the negative electrode plate portion is bent.

[0016] In some embodiments of the present invention, the positive plate portion and the negative plate portion are arranged along the length direction of the bracket, and the pair of electrical connection lugs are arranged on a side of the connecting portion away from the main plate portion and extend along the width direction of the bracket.

[0017] In some embodiments of the utility model, the bracket is provided with a plurality of positioning posts, each of the conductive plates is provided with two positioning holes, the two positioning holes are staggered in the length direction and the width direction of the conductive plate, and the positioning posts cooperate with the corresponding positioning holes.

[0018] The utility model also provides a battery pack structure, the battery pack structure includes a plurality of battery cells and the above-mentioned integrated busbar, the integrated busbar includes:

[0019] Bracket;

[0020] A plurality of conductive plates, wherein the plurality of conductive plates are mounted on a surface of the bracket and arranged at intervals; and

[0021] A circuit board, wherein a plurality of spaced electrical connection lugs are protruding from the edge of the circuit board, the electrical connection lugs are integrally formed with the conductive layer in the circuit board, and one end of each electrical connection lug away from the circuit board is correspondingly welded to each conductive plate;

[0022] A plurality of the battery cells are respectively connected to the conductive plates.

[0023] In the integrated busbar of the utility model, a plurality of electrical connection lugs are arranged at the edge of the circuit board, and the electrical connection lugs are integrally formed with the conductive layer in the circuit board. The circuit is connected in series by corresponding welding between the electrical connection lugs and the conductive plate. During the manufacturing process, only one connection part between the circuit board and the conductive plate needs to be welded once, and there are fewer welding points, which can reduce the risk of welding point failure, reduce processing steps and testing steps, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 This is a schematic structural diagram of an embodiment of a battery pack structure of the utility model;

[0026] Figure 2 This is a structural schematic diagram of an embodiment of the integrated busbar of the utility model;

[0027] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0028] Figure 4 It is a structural schematic diagram of an embodiment of a conductive plate in the utility model.

[0029] Description of Figure Numbers:

[0030] Label name Label name 100 Integrated busbar 30 Circuit Board 10 Bracket 31 Electrical connection lug 11 Positioning column 311 Free end 20 Conductive plate 312 Fixed end 201 Mounting slot 32 Main board 202 Positioning hole 33 Connecting plate 203 Detection hole 34 Temperature detection module 21 Positive plate 200 Battery Cell 22 Negative plate 1000 Battery pack structure

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] The utility model proposes an integrated busbar 100, comprising a bracket 10, a plurality of conductive plates 20 and a circuit board 30; the plurality of conductive plates 20 are mounted on a surface of the bracket 10 and arranged at intervals; a plurality of electrical connection lugs 31 arranged at intervals are protruded from the edge of the circuit board 30, the electrical connection lugs 31 are integrally formed with the conductive layer in the circuit board 30, and one end of each of the electrical connection lugs 31 away from the circuit board 30 is correspondingly welded to each of the conductive plates 20.

[0036] The bracket 10 is generally made by the blister process. The bracket 10 can be set to a disc shape, a frame shape, etc. The conductive plate 20 is used to connect with the battery cell 200. Generally, the conductive plate 20 is made of aluminum bar. Generally, the plurality of conductive plates 20 include a positive electrode plate, a plurality of intermediate plates and a negative electrode plate. The positive electrode plate and the negative electrode plate are connected to the ends of the circuit board 30, and the plurality of intermediate plates are connected in series between the positive electrode plate and the negative electrode plate through the circuit board 30. In this way, after the battery cell 200 is installed, the circuit board 30 connects the plurality of battery cells 200 in series to realize the integration of the battery cells 200, and the integrated busbar 100 realizes current output and return through the positive electrode plate and the negative electrode plate.

[0037] The circuit board 30 is generally made of FPC (flexible circuit board 30), which has good flexibility and light weight. The electrical connection lugs 31 and the conductive plate 20 can be welded by ultrasonic welding, resistance welding or arc welding using nickel-based electrodes, which is not specifically limited here.

[0038] In the integrated busbar 100 of the present invention, a plurality of electrical connection lugs 31 are arranged at the edge of the circuit board 30. The electrical connection lugs 31 are integrally formed with the conductive layer in the circuit board 30. The circuit is connected in series by corresponding welding between the electrical connection lugs 31 and the conductive plate 20. During the manufacturing process, only one connection portion between the circuit board 30 and the conductive plate 20 needs to be welded once, resulting in fewer welding points, which can reduce the risk of welding point failure, reduce processing steps and testing steps, and improve production efficiency.

[0039] Considering that when the battery cell 200 heats up and expands, the battery cell 200 drives the conductive plate 20 to move, and each conductive plate 20 moves in a direction away from or close to the circuit board 30, stress is generated at the connection between the two, and the rigid connection between the two is prone to structural fracture and circuit breaking. Therefore, in some embodiments of the utility model, the electrical connection lug 31 has a fixed end 312 close to the edge of the circuit board 30 and a free end 311 away from the edge of the circuit board 30, the fixed end 312 is at least partially bent, and the free end 311 is welded to the conductive plate 20.

[0040] Through the above solution, the bent portion of the fixed end 312 can produce elastic deformation to eliminate stress and avoid structural fracture and circuit breaking problems.

[0041] Considering that the strength of the structural connection between the circuit board 30 and the conductive plate 20 is low only through the electrical connection lugs 31, when the two have a tendency to be misaligned due to battery expansion, the electrical connection lugs 31 are easily disconnected from the conductive plate 20. Therefore, in some embodiments of the utility model, the circuit board 30 includes a main plate 32 and a plurality of connecting plate portions 33 protruding from the edge of the main plate 32, the connecting plate portions 33 cooperate with the conductive plate 20, and the electrical connection lugs 31 are formed on the edge of the connecting plate portions 33. In this way, the circuit board 30 can strengthen the connection strength with the conductive plate 20 through the connecting plate portions 33.

[0042] Furthermore, when the battery expands, the circuit board 30 and the conductive sheet generate an interaction force so that the two have a tendency to be misaligned, and the interaction force is basically along the direction of the board surface. Therefore, in some embodiments of the utility model, at least one side of the conductive plate 20 is provided with an assembly groove 201, and the connecting plate portion 33 is assembled in the assembly groove 201. In this way, the connecting plate portion 33 and the conductive plate 20 can be prevented from being misaligned in the board surface direction, and during assembly, the circuit board 30 can be directly placed on the bracket 10, and the connecting plate portion 33 can be aligned with the assembly groove 201, which is more convenient for assembly.

[0043] In some embodiments of the present invention, the circuit board 30 is provided with a temperature detection module 34, and the temperature detection module 34 is located on the side of the connecting plate portion 33 facing away from the conductive plate 20. The temperature detection module 34 is used to detect the temperature of the battery cell 200. Through the above solution, the temperature detection module 34 is closer to the battery cell 200 and the conductive plate 20, and the temperature detection can be more accurate.

[0044] In some embodiments of the present invention, at least part of the conductive plate 20 includes a positive plate portion 21 and a negative plate portion 22 connected to each other, the positive plate portion 21 is used to connect the positive electrode of the battery cell 200, and the negative plate portion 22 is used to connect the negative electrode of the battery cell 200; each of the connecting plate portions 33 is provided with a pair of electrical connection lugs 31, and the positive plate portion 21 and the negative plate portion 22 are both connected with a pair of electrical connection lugs 31. One of the paired electrical connection lugs 31 is used to power the chip, and the other is used to detect the voltage of the battery cell 200. Through the above solution, the distance between the two paired electrical connection lugs 31 is large to avoid interference during welding.

[0045] In some embodiments of the present invention, the connection between the positive plate portion 21 and the negative plate portion 22 is bent. In this way, when the battery cell 200 heats up and expands, and the conductive plate 20 is pulled by the battery cell 200, the bent portion of the connection between the positive plate portion 21 and the negative plate portion 22 can be unfolded, thereby preventing the conductive plate 20 or the battery cell 200 from being damaged due to large stress.

[0046] Furthermore, in some embodiments of the present invention, the positive plate portion 21 and the negative plate portion 22 are arranged along the length direction of the bracket 10, and the paired electrical connection lugs 31 are arranged on the side of the connecting portion away from the main plate 32 and extend along the width direction of the bracket 10.

[0047] Through the above solution, two pairs of electrical connection lugs 31 connected to a conductive plate 20 are spaced apart and extend along the width direction of the bracket 10. The electrical connection lugs 31 do not affect each other, which is beneficial to improving the compactness of the structure.

[0048] In some embodiments of the utility model, the bracket 10 is provided with a plurality of positioning posts 11, and each of the conductive plates 20 is provided with two positioning holes 202, and the two positioning holes 202 are staggered in the length direction and the width direction of the conductive plate 20, and the positioning posts 11 cooperate with the corresponding positioning holes 202. With such a configuration, the positioning posts 11 can not only play a role in positioning the conductive plate 20, but the two positioning posts 11 can also prevent the conductive plate 20 from being installed incorrectly.

[0049] In some embodiments of the utility model, the conductive plate 20 is further provided with a detection hole 203, and the detection hole 203 is used to detect whether the battery cell 200 is in a weldable state. The operator can detect the alignment hole of the battery cell 200 pole through the detection hole 203, thereby determining whether welding can be performed.

[0050] The utility model also provides a battery pack structure 1000, the battery pack structure 1000 includes a plurality of battery cells 200 and the above-mentioned integrated busbar 100, and the plurality of battery cells 200 are respectively connected to the conductive plate 20. Since the battery pack structure 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0051] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An integrated busbar, characterized in that: include: Bracket; A plurality of conductive plates, wherein the plurality of conductive plates are mounted on a surface of the bracket and arranged at intervals; as well as A circuit board, wherein a plurality of spaced electrical connection lugs are protruding from the edge of the circuit board, the electrical connection lugs are integrally formed with the conductive layer in the circuit board, and one end of each electrical connection lug away from the circuit board is correspondingly welded to each conductive plate.

2. The integrated busbar according to claim 1, characterized in that: The electrical connection lug has a fixed end close to the edge of the circuit board and a free end away from the edge of the circuit board, at least a part of the fixed end is bent, and the free end is welded to the conductive plate.

3. The integrated busbar according to claim 1, characterized in that: The circuit board comprises a main body plate portion and a plurality of connecting plate portions protruding from the edge of the main body plate portion, the connecting plate portions cooperate with the conductive plate, and the electrical connection lugs are formed on the edge of the connecting plate portions.

4. The integrated busbar according to claim 3, characterized in that: At least one side of the conductive plate is provided with an assembly groove, and the connecting plate portion is assembled in the assembly groove.

5. The integrated busbar according to claim 4, characterized in that: The circuit board is provided with a temperature detection module, and the temperature detection module is located on a side of the connecting plate portion facing away from the conductive plate.

6. The integrated busbar according to claim 3, characterized in that: At least part of the conductive plate includes a positive plate portion and a negative plate portion connected to each other, the positive plate portion is used to connect to the positive electrode of the battery cell, and the negative plate portion is used to connect to the negative electrode of the battery cell; Each of the connecting plate portions is provided with a pair of electrical connection lugs, and the positive plate portion and the negative plate portion are both connected with a pair of electrical connection lugs.

7. The integrated busbar according to claim 6, characterized in that: The connection between the positive electrode plate portion and the negative electrode plate portion is bent.

8. The integrated busbar according to claim 6, characterized in that: The positive plate portion and the negative plate portion are arranged along the length direction of the bracket, and the paired electrical connection lugs are arranged on a side of the connecting plate portion away from the main plate portion and extend along the width direction of the bracket.

9. The integrated busbar according to any one of claims 1 to 8, characterized in that: The bracket is convexly provided with a plurality of positioning posts, and each of the conductive plates is provided with two positioning holes, the two positioning holes are staggered in the length direction and the width direction of the conductive plate, and the positioning posts cooperate with the corresponding positioning holes.

10. A battery pack structure, characterized in that: The battery pack structure comprises a plurality of battery cells and an integrated busbar as claimed in any one of claims 1 to 9, and the plurality of battery cells are respectively connected to the conductive plates.

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