CN219067155U

CN219067155U - Busbar, battery module and power device

Info

Publication number: CN219067155U
Application number: CN202223530334.9U
Authority: CN
Inventors: 刘学文; 赵亮
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-05-23
Anticipated expiration: 2032-12-28

Abstract

The utility model provides a bus bar, a battery module and a power device, which belong to the technical field of power batteries, wherein the bus bar comprises: a first conduction part; the second conducting part is arranged at an interval relative to the first conducting part, one surface of the first conducting part facing the second conducting part is a first conducting surface, and one surface of the second conducting part facing away from the first conducting part is a second conducting surface; the connecting part is connected between the first conducting part and the second conducting part, and two opposite sides of the connecting part are respectively connected with two side edges of the first conducting part and the second conducting part, which are positioned on the same side; and the through hole is formed in the connecting part, and allows welding equipment to enter. According to the bus bar provided by the utility model, two battery cores can be connected in series by only using one bus bar through two times of welding, so that the production process is simplified, the production efficiency is improved, and the process cost and the part management cost are reduced; and the busbar has longer straight section, is convenient for the cooperation of temperature sensing piece and busbar to be connected.

Description

Busbar, battery module and power device

Technical Field

The utility model relates to the technical field of power batteries, in particular to a busbar, a battery module and a power device.

Background

The trapezoid battery cell has the characteristics of being capable of avoiding bending of the electrode lug and being high in current carrying capacity. For a battery module composed of trapezoidal cells, when two adjacent cells are electrically connected, as shown in fig. 1 and 2, a sectional type splice busbar or a Z-type busbar is generally used. As shown in fig. 1, two sections of L-shaped aluminum bars are used for welding with the poles of two electric cores respectively, and then the two sections of L-shaped aluminum bars are welded after being lapped; therefore, the sectional type spliced busbar needs to be welded for three times, so that the production efficiency is low, the process cost is high, the types of parts are multiple, and the management cost is high. As shown in fig. 2, when a Z-type busbar is used, the busbar has fewer straight sections, which is disadvantageous for connection with the temperature sensing portion of the sampling loop.

Disclosure of Invention

Therefore, the utility model aims to overcome the defects that the production efficiency is low due to more welding times and the connection with a sampling loop is inconvenient due to fewer straight sections when the bus bars are used for connecting the battery cells in series in the prior art, thereby providing the bus bars, the battery module and the power device.

In order to solve the above problems, the present utility model provides a bus bar including: a first conduction part; the second conducting part is arranged at an interval relative to the first conducting part, one surface of the first conducting part facing the second conducting part is a first conducting surface, and one surface of the second conducting part facing away from the first conducting part is a second conducting surface; the connecting part is connected between the first conducting part and the second conducting part, and two opposite sides of the connecting part are respectively connected with two side edges of the first conducting part and the second conducting part, which are positioned on the same side; and the through hole is formed in the connecting part, and the welding equipment is allowed to enter the through hole.

Optionally, the connection portion is vertically connected with the first conduction portion, and the connection portion is vertically connected with the second conduction portion.

Optionally, the through hole is located at a middle position of the connecting portion.

The utility model also provides a battery module, which comprises the busbar.

Optionally, the battery module further comprises a plurality of trapezoid electric cores, the trapezoid electric cores are sequentially arranged along the thickness direction of the trapezoid electric cores, and the tops of the trapezoid electric cores face the same direction; each trapezoid battery cell comprises two polar posts, and the two polar posts are arranged at the bottom of the trapezoid battery cell and are positioned at the part, extending out of the top, of the bottom; the busbar is connected in series with two adjacent trapezoidal electric cores, the first conducting surface is connected with one of the poles of the trapezoidal electric cores in a fitting mode, and the second conducting surface is connected with the other one of the poles of the trapezoidal electric cores in a fitting mode.

Optionally, the battery module further comprises a sampling circuit board and a temperature sensing piece, wherein the sampling circuit board is electrically connected with the temperature sensing piece, and the temperature sensing piece is in fit connection with the connecting part.

Optionally, the battery module further comprises a ribbon, the ribbon is arranged around the periphery of the trapezoid battery cells, and the sampling circuit board is arranged on the ribbon.

Optionally, the busbar is provided with a plurality of, the temperature sensing piece also is provided with a plurality of, a plurality of the temperature sensing piece respectively with a plurality of the busbar corresponds the setting, a plurality of the temperature sensing piece all with sampling circuit board electricity is connected.

Optionally, the trapezoid battery cell further comprises an explosion-proof valve, and the explosion-proof valve corresponds to the through hole.

The utility model also provides a power device comprising the battery module.

The utility model has the following advantages:

1. according to the busbar provided by the utility model, the first conducting surface is welded with the pole of one cell at the outer side of the first conducting part, the welding equipment extends into the through hole, and the second conducting surface is welded with the pole of the other cell at the inner side of the second conducting part, so that the two cells are connected in series by using the busbar through welding twice, the production process is simplified, the production efficiency is improved, and the process cost and the part management cost are reduced; and through setting up connecting portion, make the busbar have longer straight section, be convenient for the cooperation of temperature sensing piece and busbar be connected.

2. According to the battery module, the ribbon of the battery module is used as the supporting structure of the sampling circuit board, other fixing structures or supports are not required to be added, the function multiplexing is realized, and the fixing cost of the sampling circuit board is saved.

3. According to the battery module provided by the utility model, the explosion-proof valve is arranged corresponding to the through hole, so that the smoothness of exhaust of the explosion-proof valve is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art sectional splice bus bar connecting adjacent cells;

FIG. 2 is a schematic diagram showing the structure of a prior art Z-shaped bus bar connecting adjacent cells;

fig. 3 is a schematic view showing a first angle of a bus bar according to embodiment 1 of the present utility model;

fig. 4 is a schematic view showing a structure of a second angle of the bus bar provided in embodiment 1 of the present utility model;

fig. 5 is a schematic view showing the structure of a first angle of a battery module provided in embodiment 2 of the present utility model;

fig. 6 is a schematic view showing the structure of a second angle of the battery module provided in embodiment 2 of the present utility model;

fig. 7 is a schematic side view showing the structure of a battery module according to embodiment 2 of the present utility model;

fig. 8 is a schematic diagram showing a connection structure between adjacent ladder-shaped cells and a busbar according to embodiment 2 of the present utility model.

Reference numerals illustrate:

10. a first conduction part; 11. a first conduction surface; 12. a first welding surface; 20. a second conduction part; 21. a second conduction surface; 22. a second welding surface; 30. a connection part; 40. a through hole; 100. a busbar; 200. a trapezoidal cell; 210. a pole; 220. an explosion-proof valve; 300. sampling a circuit board; 400. a temperature sensing sheet; 500. a tie; 600. a connector.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

One embodiment of a bus bar 100 as shown in fig. 3 and 4 includes: a first conductive portion 10, a second conductive portion 20, and a connection portion 30. The first conductive portion 10 and the second conductive portion 20 are disposed at opposite intervals, a surface of the first conductive portion 10 facing the second conductive portion 20 is a first conductive surface 11, and a surface of the second conductive portion 20 facing away from the first conductive portion 10 is a second conductive surface 21. The connection portion 30 is connected between the first conductive portion 10 and the second conductive portion 20, and two opposite sides of the connection portion 30 are respectively connected to two sides of the first conductive portion 10 and the second conductive portion 20 on the same side. The connecting portion 30 is provided with a through hole 40, and the welding equipment is allowed to enter the through hole 40.

The first conducting surface 11 is welded with the pole 210 of one cell at the outer side of the first conducting part 10, welding equipment stretches into the through hole 40, and the second conducting surface 21 is welded with the pole 210 of the other cell at the inner side of the second conducting part 20, so that the two cells are connected in series by using one busbar 100 through welding twice, the production process is simplified, the production efficiency is improved, and the process cost and the part management cost are reduced; in addition, the connecting part 30 is arranged, so that the busbar 100 has a longer straight section, and the temperature sensing piece 400 is convenient to be matched and connected with the busbar 100.

It should be noted that, referring to fig. 3, the right side of the first conducting portion 10 is the first conducting surface 11, the right side of the second conducting portion 20 is the second conducting surface 21, that is, the right side of the first conducting portion 10 is connected with the post 210 of one cell, and the right side of the second conducting portion 20 is connected with the post 210 of another cell, so that the two cells are connected in series by using the bus bar 100. The left side surface of the first conducting part 10 is a first welding surface 12, that is, the welding equipment performs penetration welding on the first conducting part 10 at the left side of the first conducting part 10, so that the first conducting part 10 and the pole 210 are connected; the left side surface of the second conducting portion 20 is the second welding surface 22, that is, the welding device enters from the through hole 40 and corresponds to the second welding surface 22, and the welding device performs penetration welding on the second conducting portion 20 at the left side of the second conducting portion 20, so that the second conducting portion 20 and the pole 210 are connected.

Further, oblique laser welding is used in the welding.

In the present embodiment, as shown in fig. 3 and 4, the connection portion 30 is connected perpendicularly to the first conductive portion 10, and the connection portion 30 is also connected perpendicularly to the second conductive portion 20.

In the present embodiment, as shown in fig. 3 and 4, the through hole 40 is located at the middle position of the connection portion 30, and therefore, the connection portion 30 has a rectangular frame structure. That is, referring to fig. 3, the left side of the connection portion 30 is connected to the first conductive portion 10, the right side of the connection portion 30 is connected to the second conductive portion 20, and referring to fig. 5, the upper side of the connection portion 30 is connected to the temperature sensing plate 400 of the sampling circuit.

Example 2

One embodiment of a battery module as shown in fig. 5 to 8 includes the bus bar 100 of example 1. The battery module further comprises a plurality of trapezoid battery cells 200, the trapezoid battery cells 200 are sequentially arranged along the thickness direction of the trapezoid battery cells 200, and the tops of the trapezoid battery cells 200 face the same direction. Each of the trapezoid batteries 200 includes two poles 210, and the two poles 210 are disposed at the bottom of the trapezoid battery 200 and located at the portion of the bottom extending out of the top. The busbar 100 is connected in series with two adjacent trapezoidal cells 200, the first conducting surface 11 is in fit connection with the pole 210 of one of the trapezoidal cells 200, and the second conducting surface 21 is in fit connection with the pole 210 of the other trapezoidal cell 200.

It should be noted that referring to fig. 8, the top of the trapezoidal cell 200 is the small head of the trapezoidal cell 200, i.e. the upper part shown in fig. 8; the bottom of the trapezoid battery cell 200 is the large head of the trapezoid battery cell 200, namely the lower part shown in fig. 8.

As shown in fig. 5 to 7, the battery module further includes a sampling circuit board 300 and a temperature sensing sheet 400, the sampling circuit board 300 is electrically connected to the temperature sensing sheet 400, and the temperature sensing sheet 400 is bonded to the connection part 30. Specifically, the temperature sensing sheet 400 is a nickel sheet, and the nickel sheet is welded to the connection portion 30.

In the present embodiment, the width of the connection portion 30 is approximately equal to the thickness of the battery cell, that is, the width of the temperature sensing piece 400 that can be mated with the busbar 100 is approximately equal to the thickness of the battery cell. The height of the hole of the through hole 40 is the same as the length of the bead where the second conductive portion 20 and the post 210 are welded.

In this embodiment, as shown in fig. 5 to 7, the battery module further includes a tie 500, the tie 500 being disposed around the outer circumferences of the plurality of trapezoid cells 200, and the sampling circuit board 300 being disposed on the tie 500. Therefore, the ribbon 500 is used as a supporting structure of the sampling circuit board 300, and other fixing structures or supports are not required to be added, so that the function multiplexing is realized, and the fixing cost of the sampling circuit board 300 is saved.

It should be noted that, referring to fig. 3, the connection portion 30 can be used to connect with the temperature sensing piece 400 from the left side to the right side, so that the tolerance range of the temperature sensing piece 400 is large, and the difficulty in setting the sampling circuit board 300 and welding the temperature sensing piece 400 are reduced.

In this embodiment, the sampling circuit board 300 is adhesively disposed with the tie 500.

In this embodiment, as shown in fig. 5 to 7, a plurality of bus bars 100 are disposed along the arrangement direction of the plurality of ladder-shaped battery cells 200, a plurality of temperature sensing sheets 400 are also disposed, the plurality of temperature sensing sheets 400 are disposed in one-to-one correspondence with the plurality of bus bars 100, and the plurality of temperature sensing sheets 400 are electrically connected with the sampling circuit board 300.

It should be noted that, referring to fig. 5 to 7, the sampling circuit board 300 is disposed close to the bus bar 100, so that the length of the nickel sheet can be reduced, and the use cost of the nickel sheet can be reduced.

As shown in fig. 5, the sampling circuit boards 300 are provided on both long sides of the tie 500, and both sampling circuit boards 300 are simultaneously collected toward the end plate side of the battery module and are electrically connected with the connector 600 to transmit the collected information.

As shown in fig. 5 and 7, the trapezoid electric core 200 further includes an explosion-proof valve 220, and the explosion-proof valve 220 corresponds to the through hole 40, so as to ensure the smoothness of the exhaust of the explosion-proof valve 220.

The embodiment also provides a specific implementation mode of the power device, which comprises the battery module of the embodiment 2. The power plant may be a vehicle.

According to the above description, the present patent application has the following advantages:

1. the bus bars can be used for connecting two battery cores in series by welding twice, so that the production process is simplified, the production efficiency is improved, and the process cost and the part management cost are reduced;

2. the busbar is provided with a longer straight section, so that the temperature sensing piece is convenient to be connected with the busbar in a matched manner;

3. the ribbon of the battery module is used as a supporting structure of the sampling circuit board, other fixing structures or supports are not required to be added, the function multiplexing is realized, and the fixing cost of the sampling circuit board is saved.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A bus bar, comprising:

a first conduction unit (10);

a second conducting part (20) which is arranged at an interval relative to the first conducting part (10), wherein one surface of the first conducting part (10) facing the second conducting part (20) is a first conducting surface (11), and one surface of the second conducting part (20) facing away from the first conducting part (10) is a second conducting surface (21);

the connecting part (30) is connected between the first conducting part (10) and the second conducting part (20), and two opposite sides of the connecting part (30) are respectively connected with two side edges of the first conducting part (10) and the second conducting part (20) which are positioned on the same side;

and a through hole (40) which is formed in the connection portion (30), wherein the welding equipment is allowed to enter the through hole (40).

2. The busbar according to claim 1, wherein the connection portion (30) is vertically connected to the first conductive portion (10), and the connection portion (30) is vertically connected to the second conductive portion (20).

3. Busbar according to claim 1 or 2, characterised in that the through-hole (40) is located in a middle position of the connection portion (30).

4. A battery module characterized by comprising a busbar (100) according to any one of claims 1 to 3.

5. The battery module according to claim 4, further comprising a plurality of trapezoid electric cells (200), wherein the plurality of trapezoid electric cells (200) are arranged in sequence along the thickness direction of the trapezoid electric cells (200), and the tops of the plurality of trapezoid electric cells (200) are arranged toward the same direction; each trapezoid electric core (200) comprises two polar posts (210), and the two polar posts (210) are arranged at the bottom of the trapezoid electric core (200) and are positioned at the part, extending out of the top, of the bottom; the busbar (100) is connected with two adjacent trapezoidal electric cores (200) in series, the first conducting surface (11) is connected with one of the polar columns (210) of the trapezoidal electric cores (200) in a fitting mode, and the second conducting surface (21) is connected with the other polar column (210) of the trapezoidal electric core (200) in a fitting mode.

6. The battery module according to claim 5, further comprising a sampling circuit board (300) and a temperature sensing sheet (400), wherein the sampling circuit board (300) is electrically connected to the temperature sensing sheet (400), and wherein the temperature sensing sheet (400) is bonded to the connecting portion (30).

7. The battery module according to claim 6, further comprising a tie (500), wherein the tie (500) is disposed around the outer circumferences of the plurality of trapezoid cells (200), and the sampling circuit board (300) is disposed on the tie (500).

8. The battery module according to claim 6, wherein the bus bar (100) is provided with a plurality of temperature sensing pieces (400), the plurality of temperature sensing pieces (400) are respectively provided corresponding to the plurality of bus bars (100), and the plurality of temperature sensing pieces (400) are electrically connected to the sampling circuit board (300).

9. The battery module according to claim 5, wherein the trapezoid cell (200) further includes an explosion-proof valve (220), the explosion-proof valve (220) corresponding to the through hole (40).

10. A power plant comprising a battery module according to any one of claims 4-9.