CN114583398A

CN114583398A - Busbar, electric core acquisition assembly and battery module

Info

Publication number: CN114583398A
Application number: CN202210113139.1A
Authority: CN
Inventors: 张腾飞; 汤杰; 赵成明
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-01-29
Filing date: 2022-01-29
Publication date: 2022-06-03

Abstract

The invention belongs to the technical field of batteries and discloses a busbar, a battery cell acquisition assembly and a battery module. The busbar is used for electrically connecting a plurality of battery cells to form a battery cell group, and the busbar comprises a plurality of busbar main bodies, base materials and pins. Each busbar body includes a first conductive portion electrically connected to the first electrode of one cell and a second conductive portion electrically connected to the second electrode of another cell. The first conductive part and the second conductive part are electrically connected through the connecting part, and the adjacent bus bar main bodies are electrically connected through the base material. The pins are connected to the bus bar body for data connection with the BMS. This busbar simple structure, the commonality is good, is connected with BMS through setting up the pin, need not to use FPC/FFC switching, has alleviateed the weight of battery module, and occupation space is little in battery system, and it is big to connect the battery module energy density who forms.

Description

Busbar, electric core acquisition assembly and battery module

Technical Field

The invention relates to the technical field of batteries, in particular to a bus bar, a battery cell acquisition assembly and a battery module.

Background

The battery module is a core component of the battery system. The battery module comprises a plurality of battery cores, and the battery cores are usually electrically connected through busbars.

Most of bus bar structures in the prior art are complex in shape and difficult to manufacture, in order to collect signals such as voltage or temperature of a Battery cell, an FPC (Flexible Printed Circuit)/FFC (Flexible Flat Cable) is generally required to be adopted, a nickel sheet is led out from the FPC/FFC to be welded on the bus bar, the voltage or temperature signal of the Battery cell is collected by the nickel sheet, and then the signal is transmitted to a BMS (Battery Management System), the production cost of the Battery System is increased by the arrangement of the FPC/FFC, meanwhile, the assembly process is complex, too much space inside the Battery System is occupied, and the whole space utilization rate is low.

Therefore, a bus bar with a simple structure and capable of increasing the energy density of the battery module is needed to solve the above problems.

Disclosure of Invention

An object of the present invention is to provide a bus bar having a simple structure, which is connected to a signal collecting element through pins without using FPC/FFC switching, thereby reducing the weight of a battery module, occupying a small space in a battery system, and increasing the energy density of the battery module formed by connection.

In order to achieve the purpose, the invention adopts the following technical scheme:

a buss bar for electrically connecting a plurality of cells to form a cell pack, comprising:

a plurality of busbar bodies, each of which includes a first conductive portion electrically connected to a first electrode of one of the battery cells and a second conductive portion electrically connected to a second electrode of another one of the battery cells, the first conductive portion and the second conductive portion being electrically connected by a connecting portion therebetween;

the adjacent bus bar bodies are electrically connected through the base material;

and the pins are connected to the bus bar main body and used for being in data connection with a battery management system.

Optionally, the pin is a sheet structure.

Optionally, the pin includes a first portion and a second portion, the first portion and the second portion are connected at an included angle, the busbar body is connected to the first portion, and the battery management system is connected to the second portion.

Optionally, the first portion is parallel to an end surface of the battery cell, and the second portion extends in a height direction of the battery cell.

Optionally, the pin is connected to the busbar body at least one of two ends of the busbar.

Optionally, the busbar is of unitary construction.

Optionally, the connecting portion and the surface of the base material are provided with an insulating layer.

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

Optionally, the base material includes a main body section and two connecting sections, the two connecting sections are connected through the main body section, the connecting section and the main body section are arranged at an included angle, and the busbar main body is connected to the connecting section.

Optionally, a through hole is arranged at the joint of the connecting section and the main body section.

Optionally, the joint of the connecting section and the main body section is rounded.

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

Optionally, the first conductive portion and the second conductive portion have a height difference therebetween.

Another object of the present invention is to provide a cell collecting assembly, which does not need to use FPC/FFC switching, and saves the internal space of the battery pack, thereby facilitating to improve the energy density of the battery pack.

the battery cell acquisition assembly comprises a signal acquisition element and the bus bar, and the pin is in data connection with the signal acquisition element.

Optionally, the signal acquisition element is a temperature sensor.

Optionally, a voltage signal collecting board is connected to the pin.

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

the utility model provides a battery module, includes a plurality of electric cores and at least one foretell electric core collection assembly, electric core collection assembly's busbar will be a plurality of electric core electricity is connected.

Has the advantages that:

the busbar provided by the invention is electrically connected with the first electrode of the battery cell by arranging the first conductive part, the second conductive part is electrically connected with the second electrode of the battery cell, the first conductive part and the second conductive part are electrically connected through the connecting part, and then the plurality of busbar main bodies are electrically connected through the base material, so that the plurality of battery cells are connected in series or in parallel to form the battery core group. Adopt the pin to connect BMS, abandoned FPC/FFC's use, saved battery system's inner space to improve battery system's energy density, simultaneously, improved the degree of integrating that the electricity of electric core is connected, alleviateed battery system's weight, busbar simple structure makes convenient assembling, low in production cost.

The battery cell acquisition assembly provided by the invention comprises the bus bar, and the pins are arranged at one end of the bus bar and are directly connected with the BMS in a data manner without being switched by adopting FPC/FFC (flexible printed circuit/flexible flat cable), so that the Z-direction space of the battery system is saved, and the light weight of the battery system is facilitated.

The battery module provided by the invention adopts the battery cell acquisition assembly, a plurality of battery cells are connected in series or in parallel through the busbar of the battery cell acquisition assembly, and the battery module is connected with the BMS through pins, so that the integration degree is high. Through setting up the insulating layer and avoiding electrically conductive contact between the busbar, reduced the short circuit risk between the busbar, replaced complicated busbar structure and plastics pencil division board structure among the prior art. The bus bar is convenient and reliable to connect with the battery core, and has the advantages of simple structure, less current loss, low heating degree and high safety performance. The bus bar and the pins are light in weight, and the internal space of the battery system is saved. Its structural style can make a plurality of electric cores compact arrangement, has improved the energy density of battery module in the very big degree, and the low in manufacturing cost of battery module.

Drawings

FIG. 1 is a schematic view of a bus bar according to the present invention;

fig. 2 is an assembly view of a bus bar and a battery cell provided by the present invention.

In the figure:

100. an electric core; 110. a first electrode; 120. a second electrode; 200. a busbar body; 210. a first conductive portion; 220. a second conductive portion; 230. a connecting portion; 300. a substrate; 310. a main body section; 320. a connecting section; 330. a through hole; 400. a pin; 500. a signal acquisition element; 600. and a voltage signal collecting board.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to 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", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

Fig. 1 is a schematic structural diagram of a bus bar according to the present embodiment. Fig. 2 is an assembly diagram of the bus bar and the battery cell 100 provided in the present embodiment. Referring to fig. 1 and 2, the bus bar for electrically connecting a plurality of battery cells 100 to form a battery core pack includes a plurality of bus bar bodies 200, a base material 300, and pins 400. Each of the bus bar main bodies 200 includes a first conductive part 210 and a second conductive part 220, the first conductive part 210 is electrically connected to the first electrode 110 of one of the battery cells 100, the second conductive part 220 is electrically connected to the second electrode 120 of another one of the battery cells 100, and the first conductive part 210 and the second conductive part 220 are electrically connected by a connection part 230. The adjacent bus bar bodies 200 are electrically connected to each other by the base 300. The pin 400 is connected to the bus bar body 200 for data connection with the BMS. In this embodiment, the first electrode is a positive electrode, and the second electrode is a negative electrode. In other embodiments, the first electrode is a negative electrode and the second electrode is a positive electrode, which can be set according to actual requirements.

In the above-mentioned busbar, the first conductive part 210 of the busbar main body 200 is electrically connected to the first electrode 110 of the battery cell 100, the second conductive part 220 is electrically connected to the second electrode 120 of the battery cell 100, and two adjacent busbar main bodies 200 are electrically connected to each other through the base material 300, so that the plurality of battery cells 100 are connected in parallel or in series to form the battery core group. The acquisition of signals is realized by providing the pins 400 on the busbar body 200. The busbar adopts this kind of structural style, simple structure, and occupation space is little, and pin 400 can link to each other with the BMS, can directly transmit information such as the voltage of the electric core that the busbar is connected and temperature to BMS to can replace traditional FPC FFC, thereby reduce the use of spare part, alleviate battery system's weight, simultaneously, save battery system Z to the use in space, improve battery system's energy density.

With continued reference to fig. 1 and fig. 2, the bus bar is of a sheet structure, and the sheet structure can greatly reduce the weight of the bus bar, so that the overall weight of the battery module is reduced, the occupied space of the bus bar in the battery system can be reduced as much as possible, and the improvement of the energy density of the battery module is facilitated. The bus bar can be of an integrated structure, is manufactured by stamping or other processes, can also be of a split structure, and is connected among all the parts in a welding or bonding mode and the like. In this embodiment, the corners of the bus bar main body 200 are all rounded, and the rounded corners can reduce stress concentration and increase the structural strength of the bus bar main body 200. Of course, the shape of the busbar body 200 is not limited thereto, and may be provided in other shapes as needed. The bus bar body 200 may be made of a metal material 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 easily connected to the battery cell 100.

Further, the pin 400 is a sheet structure, and includes a first portion and a second portion, the first portion and the second portion are connected at an included angle, the busbar body 200 is connected to the first portion, and the battery management system is connected to the second portion. In the present embodiment, in order to facilitate the layout of the components in the battery system, the first portion is parallel to the end surface of the battery cell 100, and the second portion extends in the height direction of the battery cell 100, that is, the first portion and the second portion are vertically connected to form an L shape. Alternatively, the second portion extends downward in the height direction of the battery cell 100 according to the internal spatial layout of the battery system. In this embodiment, the first portion and the second portion are both in a straight shape, and in other embodiments, may be in other shapes. The included angle between first portion and the second portion can be 0, connects and forms a style of calligraphy, also can be other angles, and it can to set up according to battery system inner space overall arrangement. The pin 400 is connected to the bus bar main body 200 at least one of the two ends of the bus bar, and further, the second portion is disposed outside the electric core set and connected to the connecting portion 230, so as to facilitate connection with the signal collecting element. In other embodiments, the second portion may also be disposed between two adjacent rows of battery cells 100 or disposed at other positions, and the second portion may be disposed according to actual needs. It is understood that the pin 400 is made of a conductive material, and may be integrally formed with the connecting portion 230 by stamping, or may be fixedly connected by welding or riveting.

Further, in order to effectively avoid the risk of short circuit between the bus bars due to contact, an insulating layer is provided on the surfaces of the connecting portion 230 and the base 300. By providing an insulating layer on the surface of the base material 300 and the connecting portion 230, the safety of the battery system is improved. The arrangement of the insulating layer can replace a plastic wire harness isolation plate in the prior art, and compared with a traditional battery system, the internal space of the battery system is saved, so that the energy density of the battery system is effectively improved. Meanwhile, the insulating layer is arranged on the surface of the base material 300 and the connecting part 230, so that the integration degree of the electric connection of the battery cell 100 is improved, and the use number of parts is reduced, thereby reducing the weight of the battery system, reducing the heating degree of the battery system, simplifying the assembly and manufacture, and reducing the production cost. Alternatively, the insulating layer is an insulating film, such as a PET blue film, covering the surfaces of the connecting portion 230 and the substrate 300, and may be formed by spraying an insulating material on the connecting portion 230 and the substrate 300, or may be formed in other manners, as long as the connecting portion 230 and the substrate 300 can be insulated, and the insulating layer is within the protection scope of the present application.

Further, the first conductive part 210 and the battery cell 100, and the second conductive part 220 and the battery cell 100 may be connected by soldering. Since the two electrodes of the battery cell 100 have a certain height difference, in order to match the structure of the battery cell 100, the connection portion 230 and the first conductive portion 210 are in the same plane, and the second conductive portion 220 and the connection portion 230 are arranged in a step shape, so as to facilitate the connection between the busbar body 200 and the battery cell 100.

Further, the adjacent busbar bodies 200 are arranged at intervals along a first direction, and are arranged along a second direction in a staggered manner, and the first direction and the second direction form an included angle. In the present embodiment, the first direction is a width direction of the bus bar main body 200, the second direction is a length direction of the bus bar main body 200, and the first direction and the second direction are perpendicular, that is, two adjacent bus bar main bodies 200 are disposed in a staggered manner along the length direction thereof. By adopting the structure design, the connected battery cores 100 are alternately arranged in a staggered manner, and the battery cores 100 in one battery core group are arranged in a staggered manner, so that a plurality of battery cores 100 can be tightly spliced together, thereby fully utilizing the internal space of the battery system and improving the energy density of the battery module. In other embodiments, the first direction and the second direction are set as required, but the bus bar main body 200 may be set side by side along a straight line, so that the connected electric core groups are arranged in a matrix type.

Further, both ends of the substrate 300 are respectively connected to the connection parts 230 of the adjacent two bus bar main bodies 200, thereby facilitating the arrangement of the insulating layer. In this embodiment, the substrate 300 and the bus bar body 200 are connected to form a wave shape, and the bus bar body 200 is located on the peak or the valley. The base 300 includes a main body section 310 and two connecting sections 320, the two connecting sections 320 are connected by the main body section 310, the bus bar main body 200 is connected to the connecting sections 320, and the connecting sections 320 and the main body section 310 are arranged at an included angle, so that the bus bar main body 200 can be arranged in a staggered manner. In other embodiments, the substrate 300 may have a straight-line structure or other structures, and any structure that can electrically connect the adjacent bus bar bodies 200 is within the scope of the present disclosure.

Further, through holes 330 may be provided on the body section 310 for positioning and increasing structural strength. The connection between the main body section 310 and the connection section 320 is rounded to reduce stress concentration, so that the connection is more reliable. The material of the substrate 300 may be a metal material such as aluminum (alloy), copper (alloy), nickel, or other conductive material. The material of the substrate 300 and the material of the bus bar body 200 may be the same or different. The base 300 and the bus bar body 200 may be integrally formed by pressing, or may be fixedly connected by welding, caulking, or the like.

With continued reference to fig. 2, the present embodiment further provides a cell collecting assembly, which includes the above-mentioned bus bar and signal collecting element 500, and the pin 400 is in data connection with the signal collecting element 500. The signal collecting element 500 may be a temperature sensor, and of course, may also be a voltage collecting element, a pressure sensor, a humidity sensor, and the like, and the signal collecting element 500 is connected to the BMS to output information of the battery cell. Further, the pin 400 may be connected to a voltage signal collecting board 600, and the voltage signal collecting board 600 is connected to the BMS, so as to output voltage information of the battery cell.

This embodiment still provides a battery module, and this battery module includes a plurality of electric cores 100 and at least one foretell electric core collection assembly, and electric core 100 electricity is connected to electric core collection assembly's busbar. Connect BMS through the pin, integrate the degree height, busbar and pin 400 adopt the thin slice structure, and light in weight practices thrift battery system's inner space. Its structural style can make a plurality of electric cores 100 compact arrangement, has improved the energy density of battery module in the very big degree, and the manufacturing cost of battery module is low. Through setting up the insulating layer and avoiding electrically conductive contact between the busbar, reduced the short circuit risk, replaced complicated busbar structure and plastics pencil median structure among the prior art. The bus bars at the output end of the electric core group can be cut from the complete bus bars or can be produced independently. Carry out data connection with electric core 100 and BMS through pin 400, connect convenient and reliable. The battery module has the advantages of simple structure, less current loss, low heating degree and high safety performance.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

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

a plurality of bus bar main bodies (200), each of the bus bar main bodies (200) including a first conductive portion (210) and a second conductive portion (220), the first conductive portion (210) being electrically connected to a first electrode (110) of one of the battery cells (100), the second conductive portion (220) being electrically connected to a second electrode (120) of another one of the battery cells (100), the first conductive portion (210) and the second conductive portion (220) being electrically connected by a connecting portion (230);

a base material (300) electrically connected between adjacent bus bar bodies (200) through the base material (300);

a pin (400), said pin (400) connected to said bus bar body (200) for data connection with a battery management system.

2. The busbar according to claim 1, wherein the pins (400) are of sheet-like construction.

3. The buss bar of claim 1, wherein the pins (400) comprise a first portion and a second portion, the first portion and the second portion being angled, the buss bar body (200) being connected to the first portion, and the battery management system being connected to the second portion.

4. The busbar according to claim 3, wherein the first portion is parallel to an end surface of the battery cell (100), and the second portion extends in a height direction of the battery cell (100).

5. The busbar according to claim 1, wherein the pin (400) is connected to the busbar body (200) at least one of the two ends of the busbar.

6. The buss bar of claim 1, wherein the buss bar is a unitary structure.

7. The busbar according to claim 1, wherein the connecting portion (230) and the surface of the base material (300) are provided with an insulating layer.

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

9. The busbar according to any of claims 1 to 8, wherein the substrate (300) comprises a main body segment (310) and two connecting segments (320), the two connecting segments (320) being connected by the main body segment (310), the connecting segments (320) being arranged at an angle to the main body segment (310), the busbar body (200) being connected to the connecting segments (320).

10. The busbar according to claim 9, wherein the connection of the connecting segment (320) to the main body segment (310) is provided with a through hole (330).

11. The bus bar of claim 9, wherein the junction of the connecting segment (320) and the main body segment (310) is radiused.

12. The busbar according to any of claims 1 to 8, 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.

13. The busbar according to any of claims 1 to 8, 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.

14. The busbar according to any of claims 1 to 8, wherein there is a height difference between the first conductive portion (210) and the second conductive portion (220).

15. A cell acquisition assembly, comprising a signal acquisition element (500) and a busbar according to any one of claims 1 to 14, the pin (400) being in data connection with the signal acquisition element (500).

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 15, wherein a voltage signal collection board (600) is connected to the pin (400).

18. A battery module, characterized in that it comprises a plurality of cells (100) and at least one cell acquisition assembly according to any one of claims 15 to 17, the busbars of which electrically connect a plurality of the cells (100).