Integrated busbar and battery pack structure

Abstract

The utility model discloses an integrated busbar and battery pack structure. The integrated busbar and battery pack structure comprises a bracket, a plurality of conductive plates and a circuit board, the plurality of conductive plates are mounted on one side of the bracket and are arranged at intervals; the circuit board comprises a plurality of board bodies and stress arms connected between every two adjacent board bodies, and each board body is connected between every two adjacent conductive boards. According to the scheme, when the current-conducting plate connected with the battery is heated and expanded, the stress arm between the two plate bodies of the circuit board can be deformed along with the current-conducting plate, and cracking caused by large stress generated in the circuit board is avoided.

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 battery cells or modules 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, due to the thermal expansion of the battery, the integrated busbar will also produce a certain degree of deformation. Among them, the circuit board may crack or the internal circuit may break due to the deformation exceeding the limit, which may lead to the failure of the circuit board. Utility Model Content

[0004] The main purpose of the utility model is to provide an integrated busbar, aiming to prevent the circuit board from cracking and failing.

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

[0006] Bracket;

[0007] A plurality of conductive plates, wherein the plurality of conductive plates are installed on one side of the bracket and arranged at intervals; and

[0008] The circuit board comprises a plurality of board bodies and stress arms connected between two adjacent board bodies, and each of the board bodies is connected between two adjacent conductive plates.

[0009] In some embodiments of the present invention, the stress arm is configured to be S-shaped or Z-shaped.

[0010] In some embodiments of the present invention, the stress arm includes two continuous bending segments, and ends of the two bending segments that are far away from each other are respectively connected to two adjacent plate bodies.

[0011] In some embodiments of the present invention, each of the bending sections is connected to one of the two adjacent plate bodies, and a stress node is connected between each bending section and the other one.

[0012] In some embodiments of the present invention, the bending section is connected to one of the two adjacent plates and is spaced apart from the other one.

[0013] In some embodiments of the utility model, at least part of the conductive plates are arranged into two rows in the horizontal direction, the two rows of conductive plates are staggered, the plate bodies are arranged in the row intervals of the conductive plates, the longitudinal sides of the plate bodies are respectively connected to two longitudinally adjacent conductive plates, the two adjacent stress arms are symmetrically arranged, and the two ends of a conductive plate are respectively connected to the two plate bodies.

[0014] In some embodiments of the utility model, the plate body is provided with an assembly long hole, the assembly long hole extends in the transverse direction, and the bracket is provided with an assembly column, and the assembly column cooperates with the assembly long hole.

[0015] In some embodiments of the present invention, the stress arm is connected to a side of the plate body away from the long assembly hole.

[0016] In some embodiments of the present invention, the plurality of conductive plates include a positive electrode plate, a plurality of intermediate electrode plates and a negative electrode plate, the positive electrode plate and the negative electrode plate are connected to the ends of the circuit board, and the plurality of intermediate electrode plates are connected in series between the positive electrode plate and the negative electrode plate through the circuit board.

[0017] 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:

[0018] Bracket;

[0019] A plurality of conductive plates, wherein the plurality of conductive plates are installed on one side of the bracket and arranged at intervals; and

[0020] A circuit board, comprising a plurality of plates and a stress arm connected between two adjacent plates, wherein each of the plates is connected between two adjacent conductive plates;

[0021] A plurality of the battery cells are respectively connected to the conductive plates.

[0022] The integrated busbar in the technical solution of the utility model includes a bracket, a plurality of conductive plates and a circuit board, the conductive plates are installed on one side of the bracket and arranged at intervals, the circuit board includes a plurality of plate bodies and stress arms connected between two adjacent plate bodies, the plate bodies are connected between two adjacent conductive plates, and the stress arms are connected between two adjacent plate bodies. Through the above solution, when the conductive plate connected to the battery expands due to heat, the stress arm between the two plate bodies of the circuit board can be deformed accordingly, avoiding the circuit board from generating large stress and cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 This is an exploded view of an embodiment of the battery pack structure of the utility model;

[0025] Figure 2 This is a structural schematic diagram of an embodiment of the integrated busbar of the utility model;

[0026] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0027] Description of Figure Numbers:

[0028] Label name Label name 100 Integrated busbar 31 plate body 10 Bracket 311 Assembly slot 20 Conductive plate 32 Stress Arm 21 Positive electrode 321 Bend section 22 Intermediate board 33 Stress Node 23 Negative electrode 200 Battery Cell 30 Circuit Board 1000 Battery pack structure

[0029] 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

[0030] 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.

[0031] 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.

[0032] 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 the 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.

[0033] 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 installed on one side of the bracket 10 and arranged at intervals; the circuit board 30 comprises a plurality of plate bodies 31 and stress arms 32 connected between two adjacent plate bodies 31, and each of the plate bodies 31 is connected between two adjacent conductive plates 20.

[0034] 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, and the aluminum bar is electrically connected to the conductive layer of the circuit board 30 through a nickel sheet. The two ends of the nickel sheet are respectively welded to the aluminum bar and the circuit board 30. Of course, the conductive plate 20 can also be connected to the circuit board 30 by plug-in electrical connection. Generally, the plurality of conductive plates 20 include a positive electrode plate 21, a plurality of intermediate plates 22, and a negative electrode plate 23. The positive electrode plate 21 and the negative electrode plate 23 are connected to the ends of the circuit board 30, and the plurality of intermediate plates 22 are connected in series between the positive electrode plate 21 and the negative electrode plate 23 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 21 and the negative electrode plate 23.

[0035] The above-mentioned circuit board 30 generally adopts FPC (flexible circuit board), which has good flexibility and light weight; the above-mentioned stress arm 32 not only serves as a structural connection between the two plate bodies 31, but is also used to electrically connect the two plate bodies 31. The circuit board 30 is generally formed into multiple plate bodies 31 and stress arms 32 by cutting. The stress arm 32 is generally set to an S-shaped, Z-shaped or other multi-section curved structure so that the stress arm 32 can extend or contract when two adjacent plate bodies 31 move away from or approach each other.

[0036] The integrated busbar 100 in the technical solution of the utility model includes a bracket 10, a plurality of conductive plates 20 and a circuit board 30. The conductive plates 20 are installed on one side of the bracket 10 and arranged at intervals. The circuit board 30 includes a plurality of plate bodies 31 and a stress arm 32 connected between two adjacent plate bodies 31. The plate body 31 is connected between two adjacent conductive plates 20, and a stress arm 32 is connected between two adjacent plate bodies 31. Through the above solution, when the conductive plate 20 connected to the battery expands due to heat, the stress arm 32 between the two plate bodies 31 of the circuit board 30 can be deformed accordingly, so as to avoid large stress in the circuit board 30 and cracking.

[0037] In some embodiments of the present invention, the stress arm 32 includes two continuous bending segments 321, and the ends of the two bending segments 321 that are far away from each other are respectively connected to the two adjacent plates 31. The limit deformation of the two bending segments 321 can meet the requirements, and the number of bending segments 321 is small, the extension length of the stress arm 32 is not large, and the circuit length inside the stress arm 32 is short, which is conducive to reducing the loss of current when it flows.

[0038] In some embodiments of the present invention, the bending section 321 is connected to one of the two adjacent plate bodies 31 and is spaced apart from the other one, so that the circuit board 30 is more flexible as a whole and is easy to deform.

[0039] In some embodiments of the present invention, each of the bending sections 321 is connected to one of the two adjacent plates 31, and a stress node 33 is connected to the other one. The stress node 33 can play a role in stabilizing the structure, so that the circuit board 30 as a whole will not be too loose, and the assembly convenience of the circuit board 30 is increased. In addition, in actual applications, after the battery heats up and expands, the two adjacent plates 31 move away from each other, and the stress generated at the stress node 33 is large, so that the plate 31 will break, which does not affect the function of the circuit board 30.

[0040] In some embodiments of the present invention, at least part of the conductive plates 20 are arranged into two rows in the horizontal direction, and the two rows of conductive plates 20 are staggered. The plate bodies 31 are arranged in the row intervals of the conductive plates 20. The longitudinal sides of the plate bodies 31 are respectively connected to two longitudinally adjacent conductive plates 20. The two adjacent stress arms 32 are symmetrically arranged, and the two ends of a conductive plate 20 are respectively connected to two corresponding plate bodies 31.

[0041] Through the above scheme, when two adjacent plates 31 move away from each other, the stress arms 32 on both sides of the plate 31 generate pulling force on them. Since the stress arms 32 on both sides of the plate 31 are symmetrical, the pulling forces received by both sides of the plate 31 are opposite and located in the same straight line, thereby avoiding the plate 31 from generating torsional force and preventing the electrical connection structure between the plate 31 and the conductive plate 20 from breaking.

[0042] Furthermore, in some embodiments of the present invention, the plate body 31 is provided with an assembly long hole 311, the assembly long hole 311 extends in the transverse direction, and the bracket 10 is provided with an assembly column, and the assembly column cooperates with the assembly long hole 311. In this way, the assembly column can play a certain positioning role on the circuit board 30, and does not affect the movement of each plate body 31 in the direction of moving away from and approaching each other.

[0043] Considering that the long assembly hole 311 will limit the arrangement of the circuits in the circuit board 30, and the arrangement space of the connection part between the stress arm 32 and the board body 31 is relatively limited, therefore, in some embodiments of the utility model, the stress arm 32 is connected to the side of the board body 31 away from the long assembly hole 311. Such a setting can avoid the long assembly hole 311 from limiting the circuit arrangement design.

[0044] The utility model also provides a battery pack structure 1000, the battery pack structure 1000 includes a plurality of battery cells 200 and the 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 embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0045] 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 installed on one side of the bracket and arranged at intervals; as well as The circuit board comprises a plurality of board bodies and a stress arm connected between two adjacent board bodies, and each of the board bodies is connected between two adjacent conductive plates.

2. The integrated busbar according to claim 1, characterized in that: The stress arm is arranged in an S shape or a Z shape.

3. The integrated busbar according to claim 1, characterized in that: The stress arm comprises two continuous bending sections, and ends of the two bending sections which are far away from each other are respectively connected to two adjacent plate bodies.

4. The integrated busbar according to claim 3, characterized in that: Each of the bending sections is connected to one of the two adjacent plate bodies, and a stress node is connected between the bending section and the other one.

5. The integrated busbar according to claim 3, characterized in that: The bending section is connected to one of the two adjacent plate bodies and is spaced apart from the other one.

6. The integrated busbar according to any one of claims 1 to 5, characterized in that: At least part of the conductive plates are arranged in two rows in the horizontal direction, the two rows of conductive plates are staggered, the plate bodies are arranged in the row intervals of the conductive plates, the longitudinal sides of the plate bodies are respectively connected to two longitudinally adjacent conductive plates, the two adjacent stress arms are symmetrically arranged, and the two ends of a conductive plate are respectively connected to two corresponding plate bodies.

7. The integrated busbar according to claim 6, characterized in that: The plate body is provided with an assembly long hole, which extends in the transverse direction. The bracket is provided with an assembly column, which cooperates with the assembly long hole.

8. The integrated busbar according to claim 7, characterized in that: The stress arm is connected to a side of the plate body away from the long assembly hole.

9. The integrated busbar according to any one of claims 1 to 5, characterized in that: The plurality of conductive plates include a positive electrode plate, a plurality of intermediate electrode plates and a negative electrode plate. The positive electrode plate and the negative electrode plate are connected to the ends of the circuit board, and the plurality of intermediate electrode plates are connected in series between the positive electrode plate and the negative electrode plate through the circuit board.

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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