CN217158574U - Busbar, electric core acquisition assembly and battery module - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and discloses a bus bar, an electric core collection component and a battery module. The bus bar is used to electrically connect a plurality of cells to form a cell group, and the bus bar includes a plurality of bus bar bodies and a base material. Each bus bar main body includes a positive conductive part and a negative conductive part, the connecting part is electrically connected to the positive electrode of one cell, the negative connecting part is electrically connected to the negative electrode of the other cell, and the positive conductive part and the negative conductive part are connected by The parts are electrically connected, and the surface of the connection part is provided with an insulating layer. The main bodies of adjacent bus bars are electrically connected through a base material, and the surface of the base material is provided with an insulating layer. The busbar has a simple structure and good versatility. By setting an insulating layer, there is no need to use a plastic wire harness isolation plate, which reduces the weight of the battery module, occupies a small space in the battery system, and can make the battery cells closely arranged and connected to form a battery module. The group has a high energy density.

Description

A busbar, cell collection component and battery module

technical field

The utility model relates to the technical field of batteries, in particular to a bus bar, a battery cell collection component and a battery module.

Background technique

The battery module is the core component of the battery system. The battery module includes a plurality of cells, and a bus bar is usually used to electrically connect the cells between the plurality of cells.

In the prior art, in order to meet the requirements of insulation withstand voltage before two adjacent bus bars, a plastic wire harness isolation plate with reinforcing ribs is usually added to ensure a safe distance between the bus bars. This method will increase the weight of the battery system, making it difficult to make full use of the internal space of the battery system. Due to the addition of a plastic wire harness isolation plate, the production and assembly processes are complicated, and the production cost is increased.

Therefore, there is an urgent need to propose a busbar with a simple structure, which is beneficial to increase the energy density of the battery module, to solve the above problems.

Utility model content

One object of the present invention is to provide a busbar, which has a simple structure and good versatility. By providing an insulating layer, there is no need to use a plastic wire harness isolation plate, thereby reducing the weight of the battery module and occupying a small space in the battery system. , the cells can be closely arranged, and the energy density of the battery module formed by the connection is high.

For this purpose, the utility model adopts the following technical solutions:

A bus bar for electrically connecting a plurality of battery cells to form a battery cell group, comprising:

A plurality of busbar bodies, each of which includes a positive electrode conducting portion and a negative electrode conducting portion, the positive electrode connecting portion is electrically connected to the positive electrode of one cell, and the negative electrode connecting portion is electrically connected to the negative electrode of the other battery cell. connection, the positive electrode conductive part and the negative electrode conductive part are electrically connected through a connection part, and the surface of the connection part is provided with an insulating layer;

A base material, the adjacent busbar main bodies are electrically connected through the base material, and an insulating layer is provided on the surface of the base material.

Optionally, both ends of the base material are respectively connected to the connecting portions of two adjacent busbar bodies.

Optionally, the adjacent bus bar main bodies are arranged at intervals along a first direction, and are arranged in a staggered manner along a second direction, and the first direction and the second direction are arranged at an included angle.

Optionally, a through hole is provided at the connection between the connecting section and the main body section.

Optionally, the connection between the connecting section and the main body section is rounded.

Optionally, the adjacent bus bar main bodies are arranged at intervals along a first direction, and are arranged in a staggered manner along a second direction, and the first direction and the second direction are arranged at an included angle.

Optionally, the base material and the busbar body are connected to form a wave shape, and the busbar body is located on a wave crest or a wave trough.

Optionally, the base material and the busbar body are integrally formed.

Optionally, there is a height difference between the positive electrode conductive portion and the negative electrode conductive portion.

Optionally, a first fuse portion is provided on the base material.

Optionally, the connecting portion is provided with a second fuse portion.

Another object of the present invention is to provide a cell collection assembly, which does not require FPC/FFC switching, saves the internal space of the battery pack, and is beneficial to improve the energy density of the battery pack.

For this purpose, the utility model adopts the following technical solutions:

A battery cell collection component includes pins and the bus bar, at least one end of the bus bar is connected with a pin, and the pin is used for data connection with a battery management system.

Optionally, the pin includes a first part and a second part arranged at an included angle, the bus bar is connected to the first part, and the second part is used for connecting with the battery management system.

Optionally, the first part is parallel to the end face of the battery cell, and the second part extends along the height direction of the battery core.

Optionally, the pins are connected with signal acquisition elements.

Optionally, the signal acquisition element is a temperature sensor.

Optionally, the pins are connected with a voltage signal summary board.

Optionally, the pins are arranged outside the cell group.

Another object of the present invention is to provide a battery module, in which the cells are closely arranged, the energy density is high, the weight is light, and the safety performance is high.

For this purpose, the utility model adopts the following technical solutions:

A battery module includes a plurality of battery cells and at least one of the above-mentioned battery cell collection components, and a bus bar of the battery cell collection component electrically connects the plurality of battery cells.

Beneficial effects:

The busbar provided by the utility model is electrically connected with the positive electrode of the battery core by arranging the positive electrode conducting part, the negative electrode conducting part is electrically connected with the negative electrode of the battery core, the positive electrode conducting part and the negative electrode conducting part are electrically connected through the connecting part, and then pass through the base material. The plurality of busbar bodies are electrically connected, so that the plurality of cells are connected in series or in parallel to form a cell group. An insulating layer is arranged on the surface of the base material and the connecting part to avoid conductive contact between the bus bars, reduce the risk of short circuit between the bus bars, abandon the use of plastic wire harness isolation plates, save the internal space of the battery system, and improve the battery system. At the same time, it improves the integration degree of the electrical connection of the battery cells, reduces the weight of the battery system, reduces the current loss, reduces the heating degree of the battery system, and is convenient to manufacture and assemble, and the production cost is low.

The battery cell collection component provided by the utility model includes the above-mentioned bus bar. By setting pins at one end of the bus bar, the pins are used to directly connect with BMS (Battery Management System, battery management system) for data connection, without using FPC (Flexible Printed) Circuit, flexible circuit board)/FFC (Flexible Flat Cable, flexible flat cable) to transfer, save the use of the Z-direction space of the battery system, and also help to realize the lightweight of the battery system.

The battery module provided by the utility model adopts the above-mentioned cell collection assembly, and connects a plurality of cells in series or parallel through the bus bar of the cell collection assembly, and is connected to the BMS through pins, with a high degree of integration. The connection between the busbar and the cell is convenient and reliable, the structure is simple, the current loss is small, the heat generation is low, and the safety performance is high. The bus bars and pins are light in weight, saving the internal space of the battery system. The structural form can make a plurality of battery cells compactly arranged, which greatly improves the energy density of the battery module, and the manufacturing cost of the battery module is low.

Description of drawings

Fig. 1 is the assembly drawing of the busbar and electric core provided by the present utility model;

Fig. 2 is the structural representation of the busbar provided by the present utility model;

FIG. 3 is an assembly diagram of the cell collection assembly and the cell provided by the present invention.

In the picture:

100, battery cell; 110, positive electrode; 120, negative electrode; 200, main body of busbar; 210, positive conductive part; 220, negative conductive part; 230, connecting part; 300, base material; 310, main body section; 320, connecting section ; 330, through hole; 400, pin; 500, signal acquisition component; 600, voltage signal summary board.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific orientation. Therefore, it should not be construed as a limitation on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Wherein, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "above" the second feature includes the first feature being "over" the second feature Directly above and diagonally above, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as a limitation of the present invention.

FIG. 1 is an assembly diagram of the bus bar and the battery cell 100 provided in this embodiment. FIG. 2 is a schematic structural diagram of the bus bar provided in this embodiment. Referring to FIG. 1 and FIG. 2 , the bus bar is used to electrically connect a plurality of battery cells 100 to form a battery cell group, and the bus bar includes a plurality of bus bar main bodies 200 and a base material 300 . Each bus bar body 200 includes a positive electrode conductive portion 210 and a negative electrode conductive portion 220 . The positive electrode conductive portion 210 is electrically connected to the positive electrode 110 of one battery cell 100 , and the negative electrode conductive portion 220 is electrically connected to the negative electrode 120 of the other battery cell 100 . The conductive portion 210 and the negative electrode conductive portion 220 are electrically connected through a connection portion 230 , and an insulating layer is provided on the surface of the connection portion 230 . The adjacent bus bar bodies 200 are electrically connected through the base material 300, and the surface of the base material 300 is also provided with an insulating layer.

In the above-mentioned bus bar, the base material 300 is used as a flow-through member, and the two adjacent bus bar main bodies 200 are electrically connected through the base material 300 . In connection, the negative electrode conductive portion 220 is electrically connected to the negative electrode 120 of the battery cell 100 , so that a plurality of battery cells 100 are connected in series or in parallel by the bus bar to form a battery cell group. By disposing an insulating layer on the surfaces of the base material 300 and the connecting portion 230 , the risk of short circuit due to contact between the bus bars can be effectively avoided, thereby improving the safety of the battery system. The arrangement of the insulating layer can replace the plastic wire harness isolation plate in the prior art, which saves its internal space compared with the traditional battery system, thereby effectively improving the energy density of the battery system. At the same time, the insulating layer and the busbar are integrated, which improves the integration degree of the electrical connection of the battery cell 100 and reduces the number of components, thereby reducing the weight of the battery system and reducing its heat generation. The assembly and manufacturing are also simplified. Reduce costs.

Optionally, the insulating layer is an insulating film coated on the surfaces of the connecting portion 230 and the base material 300 , and can also be made by spraying insulating materials on the connecting portion 230 and the base material 300 , or other methods, as long as they are suitable for The structure in which the connection portion 230 and the base material 300 are insulated is within the protection scope of the present application.

Continue to refer to Fig. 1 and Fig. 2, the busbar as a whole is a sheet-like structure, and the sheet-like structure can greatly reduce the weight of the busbar, reduce the overall weight of the battery module, and minimize the amount of the busbar in the battery system. The space occupied is beneficial to improve the energy density of the battery module. In this embodiment, the bus bar body 200 is rectangular, and the corners of the bus bar body 200 are rounded to reduce stress concentration and increase the structural strength of the bus bar body 200 . The number of bus bar bodies 200 shown in FIG. 2 is seven, which can connect fourteen battery cells 100. In other embodiments, the number of bus bar bodies 200 may be three, five, nine, etc., as required The shape of the bus bar body 200 is not limited to a rectangle, and can be set to other shapes as required. The material of the bus bar body 200 may be metal materials such as aluminum (alloy), copper (alloy), nickel, or other conductive materials. The bus bar main body 200 in this embodiment has a simple structure, is easy to process, and is easy to connect with the battery cell 100 .

Further, the connection between the positive electrode conductive portion 210 and the positive electrode 110 of the battery cell 100 and between the negative electrode conductive portion 220 and the negative electrode 120 of the battery cell 100 may be connected by welding. Since there is a certain height difference between the positive electrode 110 and the negative electrode 120 of the battery cell 100 , in order to match the structure of the battery cell 100 , there is also a height difference between the positive electrode conductive portion 210 and the negative electrode conductive portion 220 . Specifically, the connecting portion 230 and the positive conducting portion 210 are in the same plane, and the negative conducting portion 220 and the connecting portion 230 are arranged in a stepped shape to facilitate the connection between the bus bar main body 200 and the cell 100 . In this embodiment, the pole is the positive pole 110 of the battery cell 100 . In other embodiments, the pole pole may also be the negative pole 120 of the battery cell 100 .

Further, the adjacent bus bar bodies 200 are arranged at intervals along the first direction, and are arranged in a dislocation along the second direction, and the first direction and the second direction are arranged at an included angle. In this embodiment, the first direction is the width direction of the bus bar body 200, the second direction is the length direction of the bus bar body 200, and the first direction and the second direction are perpendicular. The two adjacent bus bar main bodies 200 are staggered along their length directions, so that the connected cells 100 are alternately staggered. Since the cells 100 in one cell group are staggered, a plurality of cells 100 can be closely spliced Together, the internal space of the battery system can be fully utilized and the energy density of the battery module can be improved. In other embodiments, the plurality of bus bar bodies 200 may also be aligned along the second direction, so that the connected cells 100 are arranged in a matrix.

Further, both ends of the base material 300 are respectively connected to the connecting portions 230 of the bus bar main body 200, so as to facilitate the arrangement of the insulating layer. In this embodiment, the base material 300 and the bus bar main body 200 are connected to form a wave shape, and the bus bar main body 200 is located on the crest or the trough of the wave. In other embodiments, the bus bar main body 200 can also be connected with the substrate 300 to form a straight line or other forms.

The base material 300 includes a main body section 310 and two connecting sections 320 . The two connecting sections 320 are connected by the main section 310 . With this structure, it is convenient to arrange the battery cells 100 closely. In other embodiments, the base material 300 may also be an inline structure or other structural forms, as long as it is a structural form that can electrically connect adjacent bus bar bodies 200, it is within the protection scope of the present application.

Further, a through hole 330 may be provided at the connection between the connecting segment 320 and the main body segment 310 for positioning and increasing structural strength. Rounding is performed on the connection between the connection section 320 and the main body section 310 to reduce stress concentration and make the connection more reliable. The material of the base material 300 may be a metal material such as aluminum (alloy), copper (alloy), nickel, or other conductive materials. The materials of the base material 300 and the bus bar main body 200 may be the same or different. The base material 300 and the bus bar main body 200 may be integrally formed by means of stamping or the like, or may be fixedly connected by means of welding or riveting.

Further, a first fuse portion may be provided on the base material 300. When the circuit temperature is too high due to extreme conditions such as a short circuit, the first fuse portion can be fused by self-heating, so as to quickly disconnect the adjacent battery cells 100. The current between the two, cut off the current loop, so as to protect the circuit and improve the safety of the battery system. The first fuse portion can be formed by thinning the component or coating a low melting point metal. Optionally, a second fuse portion may be provided on the connecting portion 230, and the second fuse portion has the same function as the first fuse portion. The manufacturing method of the second fuse portion may be the same as or different from that of the first fuse portion.

Referring to FIG. 3 , this embodiment further provides a cell collection component, including pins 400 and the above-mentioned bus bar, at least one end of the bus bar is connected with a pin 400 , and the pin 400 is used for data connection with the BMS. Optionally, the pin 400 is a sheet-like structure, including a first part and a second part arranged at an included angle, the bus bar is connected to the first part, and the BMS is connected to the second part. In order to facilitate the internal layout of the battery system, the second part extends downward along the height direction of the battery cells 100 , and the pins 400 are arranged on the outer side of the battery cell group. In other embodiments, the included angle between the first part and the second part is not limited to 90°, but can also be 0°, 30°, 60°, etc. The second part can also be arranged in two adjacent rows of cells 100 It can be set in between or in other positions, and the specific structural form can be set according to the actual use needs.

Further, the pin 400 is connected with a signal collection element 500, and the signal collection element 500 may be one or more of a temperature sensor, a voltage collection element, a pressure sensor, and a humidity sensor. The pin 400 is connected to the voltage signal summarizing board 600, which is then connected to the BMS to transmit the pressure signal to the BMS. The arrangement of pin 400 replaces the traditional FPC/FFC, thereby reducing the use of components, reducing the weight of the battery system, and at the same time, saving the internal space of the battery system. It can be understood that the pins 400 are made of conductive material, and can be integrally formed with the bus bar by stamping, or can be fixedly connected by welding or riveting.

This embodiment also provides a battery module, the battery module includes a plurality of cells 100 and at least one of the above-mentioned cell collection components, and the busbars of the cell collection components electrically connect the plurality of cells 100 . The cells 100 are electrically connected through the busbars, and the conductive contact between the busbars is avoided by providing an insulating layer, which reduces the risk of short circuit between the busbars, and replaces the complex busbar structure and plastic wire harness isolation in the prior art plate structure. The busbars at the output of the cell pack can be cut out of complete busbars or produced individually. The battery cell 100 and the BMS are connected through the pin 400 for data connection, which is convenient and reliable. The battery module has a simple structure, less current loss, low heat generation and high safety performance. The bus bar and the pins 400 adopt a sheet-like structure, which is light in weight and saves the internal space of the battery system. Its structural form enables a plurality of battery cells 100 to be compactly arranged, greatly improves the energy density of the battery module, and reduces the manufacturing cost of the battery module.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims (19)

1. A buss bar for electrically connecting a plurality of cells (100) to form a battery pack, comprising:

the battery pack comprises a plurality of bus bar main bodies (200), wherein each bus bar main body (200) comprises a positive electrode conductive part (210) and a negative electrode conductive part (220), the positive electrode conductive part (210) is electrically connected with a positive electrode (110) of one battery cell (100), the negative electrode conductive part (220) is electrically connected with a negative electrode (120) of another battery cell (100), the positive electrode conductive part (210) and the negative electrode conductive part (220) are electrically connected through a connecting part (230), and an insulating layer is arranged on the surface of the connecting part (230);

and a base material (300) which electrically connects the adjacent bus bar bodies (200) through the base material (300), wherein an insulating layer is arranged on the surface of the base material (300).

2. The bus bar according to claim 1, wherein both ends of the base material (300) are connected to the connection portions (230) of the adjacent two bus bar main bodies (200), respectively.

3. The busbar according to claim 1, wherein the base material (300) comprises a main body segment (310) and two connecting segments (320), the two connecting segments (320) are connected by the main body segment (310), the connecting segments (320) are arranged at an angle to the main body segment (310), and the busbar body (200) is connected to the connecting segments (320).

4. The bus bar according to claim 3, wherein a through hole (330) is provided at a connection of the connecting segment (320) and the main body segment (310).

5. The bus bar of claim 3, wherein the junction of the connecting segment (320) and the main body segment (310) is radiused.

6. The busbar according to any of claims 1 to 5, wherein adjacent busbar bodies (200) are spaced apart in a first direction and offset in a second direction, the first direction being disposed at an angle to the second direction.

7. The busbar according to any of claims 1 to 5, wherein the substrate (300) and the busbar body (200) are connected to form a wave shape, the busbar body (200) being located on a peak or a trough.

8. The busbar according to any of claims 1 to 5, wherein the substrate (300) and the busbar body (200) are integrally formed.

9. The busbar according to any one of claims 1 to 5, wherein there is a height difference between the positive conductive part (210) and the negative conductive part (220).

10. The busbar according to any of claims 1 to 5, wherein the base material (300) is provided with a first fusing portion.

11. The busbar according to any one of claims 1 to 5, wherein a second fusing part is provided on the connecting part (230).

12. A cell acquisition assembly, comprising a pin (400) and the busbar of any of claims 1-11, wherein the pin (400) is connected to at least one end of the busbar, and wherein the pin (400) is used for data connection with a battery management system.

13. The cell acquisition assembly of claim 12, wherein the pin (400) comprises a first portion and a second portion arranged at an included angle, the busbar is connected to the first portion, and the second portion is configured to be connected to the battery management system.

14. The cell acquisition assembly of claim 13, wherein the first portion is parallel to an end surface of the cell (100), and the second portion extends in a height direction of the cell (100).

15. The cell acquisition assembly according to claim 12, wherein a signal acquisition element (500) is connected to the pin (400).

16. The cell acquisition assembly according to claim 15, characterized in that the signal acquisition element (500) is a temperature sensor.

17. The cell acquisition assembly according to claim 12, wherein the pin (400) is connected to a voltage signal collection board (600).

18. The cell acquisition assembly according to claim 12, wherein the pins (400) are arranged on the outside of the battery pack.

19. A battery module, characterized by comprising a plurality of battery cells (100) and at least one cell acquisition assembly according to any one of claims 12 to 18, the busbar of which electrically connects a plurality of the battery cells (100).

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