Battery pack and automobile

Abstract

This application discloses a battery pack and an automobile, belonging to the field of battery pack technology. It includes a mounting base containing multiple longitudinally arranged parallel cell groups. Each parallel cell group includes several laterally arranged cells, with a positive terminal and a negative terminal symmetrically arranged between every two adjacent cells. The bottoms of the positive and negative terminals are fixedly mounted on the mounting base, and both have arc surfaces that conform to the adjacent cells. A positive busbar is detachably mounted on the positive terminal, and the positive busbar is electrically connected to the positive terminals of the two adjacent cells. A negative busbar is detachably mounted on the negative terminal, and the negative busbar is electrically connected to the negative terminals of the two adjacent cells. Furthermore, adjacent parallel cell groups are connected in series via a series busbar. This application, through the detachable connection between the positive terminal and the positive busbar, and between the negative terminal and the negative busbar, facilitates subsequent cell repair and replacement.

Description

Technical Field

[0001] This application relates to the field of battery pack protection, and more particularly to a battery pack and an automobile. Background Technology

[0002] In related technologies, battery packs generally adopt an integrated architecture. The busbar of the battery pack and the terminals of each cell are tightly connected into a whole through a welding process. From the perspective of structural stability and conductivity, the integrated design does have certain advantages. It can ensure efficient and stable current transmission between the cells and the busbar, thereby improving the overall performance of the battery pack.

[0003] However, because the busbar and the cell terminals are connected by welding, when a cell in the battery pack malfunctions, repair personnel need to disconnect each weld point individually when disassembling and replacing the cell. This process is not only cumbersome but also requires a high level of skill from the repair personnel. Improper operation may also damage surrounding cells or other components of the battery pack, further increasing repair costs and difficulty. Summary of the Invention

[0004] The purpose of this application is to provide a battery pack and automobile that solves the problem of difficult repair and replacement of battery pack cells in the prior art.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] On one hand, this application provides a battery pack, including:

[0007] The package includes a housing containing multiple vertically arranged parallel cell groups. Each parallel cell group comprises several horizontally arranged cells. A positive terminal and a negative terminal are symmetrically arranged between every two adjacent cells. Both the positive and negative terminals have arc surfaces that mate with the adjacent cells. The bottoms of the positive and negative terminals are fixedly mounted on the package. A positive busbar is detachably mounted on the positive terminal and electrically connected to the positive terminals of the two adjacent cells. A negative busbar is detachably mounted on the negative terminal and electrically connected to the negative terminals of the two adjacent cells. Adjacent parallel cell groups are connected in series via series buses.

[0008] In this design, the encapsulation housing contains multiple vertically arranged parallel cell groups. Each parallel cell group includes several horizontally arranged cells, which are cylindrical cells with the same positive and negative poles, and the positive pole protrudes from the negative pole surface. The parallel cell groups connect the positive poles of multiple cells together via a positive busbar and connect the negative poles of multiple cells together via a negative busbar, thus achieving parallel connection of multiple cells within the parallel cell group. Positive and negative terminals are provided on the encapsulation housing, both having arc surfaces that fit against adjacent cells. Multiple positive and negative terminals create mounting space for the cells, preventing cell movement. Furthermore, compared to related technologies where the busbar is welded to the cell, this design provides mounting positions for the positive and negative terminals, respectively, for the positive and negative busbars. The detachable connection between the positive and negative terminals facilitates subsequent cell repair and replacement. When a battery cell malfunctions, the positive and negative busbars connected to its positive and negative terminals can be easily removed from the positive and negative terminals. After repair or replacement, the battery cell can be placed back into its original position, and the positive and negative busbars can be reinstalled on the positive and negative terminals, greatly improving repair efficiency.

[0009] Optionally, the positive busbar has a first fixing part, a first connecting part and a second connecting part, the top surface of the positive terminal post has a screw hole, the first fixing part has a through hole, the first fixing part is fixed to the top surface of the positive terminal post by bolts, and the first connecting part and the second connecting part are respectively pressed into the positive terminals of the two adjacent cells.

[0010] Optionally, the negative busbar has a second fixing part, a third connecting part and a fourth connecting part, the top surface of the negative terminal post has a screw hole, the second fixing part has a through hole, the second fixing part is fixed to the top surface of the negative terminal post by bolts, and the third connecting part and the fourth connecting part are respectively pressed into the negative terminals of two adjacent cells.

[0011] In this design, the positive busbar and positive terminal, and the negative busbar and negative terminal, are fixedly connected by bolts. When it is necessary to replace the battery cell, simply loosen the bolts and remove the positive and negative busbars to remove the battery cell, greatly improving maintenance efficiency. Furthermore, the bolted connection has high strength and can withstand significant vibration and impact, ensuring the stability of the connections between the positive busbar, positive terminal, and positive terminal of the battery cell, as well as the negative busbar, negative terminal, and negative terminal of the battery cell, reducing the risk of failure due to poor connections.

[0012] Optionally, the series bus includes a positive nickel plate and a negative nickel plate, the positive nickel plate and the negative nickel plate are electrically connected through a connecting wire harness, the positive nickel plate and the negative nickel plate are respectively electrically connected to the positive bus of one parallel cell group and the negative bus of another adjacent parallel cell group, and multiple parallel cell groups are connected in series through multiple series buses.

[0013] Optionally, the positive electrode nickel sheet is pressed and fixed between the first fixing part and the positive electrode post by the bolt, and the negative electrode nickel sheet is pressed and fixed between the second fixing part and the negative electrode post by the bolt.

[0014] In this design, the positive and negative nickel plates are used to connect the positive and negative electrodes of two adjacent parallel cell groups, respectively, thus achieving series connection of the parallel cell groups. The positive and negative nickel plates are electrically connected via a connecting harness. It is important to note that the connecting harness should be wrapped with an insulating layer to prevent accidental contact with other electrodes of the cell.

[0015] Optionally, the first connecting portion has a first connecting tooth at its end, and the second connecting portion has a second connecting tooth at its end that matches the tooth shape of the first connecting tooth. In the transverse direction, the second connecting tooth of each positive busbar and the first tooth of the other positive busbar adjacent to it are sequentially interlocked.

[0016] Optionally, the third connection portion of each negative busbar and the fourth connection portion of the adjacent positive busbar abut each other in sequence.

[0017] The above scheme connects the positive busbars and the negative busbars, preventing the positive and negative busbars from rotating.

[0018] On the other hand, this application provides a vehicle that includes any of the aforementioned battery packs.

[0019] Compared with existing technologies, the beneficial effects achieved by this application are as follows: Multiple positive and negative terminals in this application can form an installation space for the battery cell, preventing cell movement. The detachable connection between the positive terminals and the positive busbar, and between the negative terminals and the negative busbar, facilitates subsequent cell repair and replacement. When a cell malfunctions, the corresponding positive and negative busbars can be easily removed; and during subsequent cell replacement, the new cell is simply placed in its original position, and the positive and negative busbars are reinstalled. This application significantly simplifies the battery pack repair and replacement process, reducing the difficulty and cost of repair and replacement. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in this application;

[0022] Figure 2 This is a schematic diagram of the parallel cell assembly structure provided in this application;

[0023] Figure 3 This is a schematic diagram of the parallel cell assembly structure provided in this application;

[0024] Figure 4 This is an enlarged schematic diagram of the positive busbar structure provided in this application;

[0025] Figure 5 This is an enlarged schematic diagram of the negative busbar structure provided in this application;

[0026] Figure 6 This is an enlarged schematic diagram of the serial bus structure provided in this application.

[0027] Explanation of reference numerals in the attached drawings: 1-Encapsulation base; 2-Parallel cell assembly; 3-Series busbar; 21-Cell; 22-Positive terminal; 23-Negative terminal; 24-Positive busbar; 25-Negative busbar; 241-First fixing part; 242-First connecting part; 243-Second connecting part; 2421-First connecting tooth; 2431-Second connecting tooth; 251-Second fixing part; 252-Third connecting part; 253-Fourth connecting part; 31-Positive nickel sheet; 32-Negative nickel sheet; 33-Connecting wire harness. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure / application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0029] Example 1

[0030] This embodiment describes a battery pack, referencing... Figures 1 to 3In this embodiment, the battery pack includes a packaging base 1, within which multiple longitudinally arranged parallel cell groups 2 are disposed. Each parallel cell group 2 includes several laterally arranged cells 21, with a positive terminal 22 and a negative terminal 23 symmetrically arranged between every two adjacent cells 21. The bottoms of the positive terminal 22 and the negative terminal 23 are fixedly mounted on the packaging base 1, and both have arc surfaces that fit against the adjacent two cells 21. A positive busbar 24 is detachably mounted on the positive terminal 22, and the positive busbar 24 is electrically connected to the positive terminals of the two adjacent cells 21. A negative busbar 25 is detachably mounted on the negative terminal 23, and the negative busbar 25 is electrically connected to the negative terminals of the two adjacent cells 21.

[0031] In this embodiment, the encapsulation base 1 contains multiple vertically arranged parallel cell groups 2. Each parallel cell group 2 includes several horizontally arranged cells 21. The cells 21 are cylindrical cells with the positive and negative electrodes facing the same direction, and their positive electrodes protrude from the negative electrode surface. The parallel cell groups 2 connect the positive electrodes of the multiple cells 21 together through a positive busbar 24 and connect the negative electrodes of the multiple cells 21 together through a negative busbar 25, thereby achieving parallel connection of multiple cells 21 within the parallel cell group 2. The parallel connection of multiple cells 21 can increase the total capacity of the battery pack. In the field of electric vehicles, the parallel connection of multiple cells 21 can improve the total capacity and driving range of the battery pack.

[0032] Furthermore, a positive terminal 22 and a negative terminal 23 are provided on the packaging base 1. Both have arc surfaces that fit against adjacent battery cells 21. The multiple positive terminals 22 and negative terminals 23 can form an installation space for the battery cells 21, preventing the battery cells 21 from shaking. In addition, compared with the busbars being welded to the battery cells 21 in related technologies, in this embodiment, the positive terminals 22 and negative terminals 23 provide installation positions for the positive busbar 24 and the negative busbar 25, respectively. The detachable connection between the positive terminals 22 and the positive busbar 24, and the detachable connection between the negative terminals 23 and the negative busbar 25, creates conditions for subsequent maintenance and replacement of the battery cells 21. When a battery cell 21 malfunctions, the positive busbar 24 and negative busbar 25 connected to its positive and negative terminals can be removed from the positive terminal 22 and negative terminal 23, making it easy to remove the battery cell 21. After repair or replacement, the battery cell 21 can be put back into its original position, and the positive and negative busbars can be reinstalled on the positive terminal 22 and negative terminal 23, which greatly improves repair efficiency.

[0033] Furthermore, two adjacent parallel cell groups 2 are connected in series via a series bus 3. By connecting the parallel cell groups 2 in series, the total voltage of the battery pack can be increased to suit various voltage requirements.

[0034] Example 2:

[0035] Based on the same inventive concept as Embodiment 1, refer to Figure 4 In this embodiment, the positive busbar 24 has a first fixing part 241, a first connecting part 242, and a second connecting part 243. The top surface of the positive terminal post 22 has a screw hole, and the first fixing part 241 has a through hole. The first fixing part 241 is fixed to the top surface of the positive terminal post 22 by bolts. The first connecting part 242 and the second connecting part 243 are respectively pressed onto the positive terminals of two adjacent cells 21. (Reference) Figure 5 In this embodiment, the negative busbar 25 has a second fixing part 251, a third connecting part 252, and a fourth connecting part 253. The top surface of the negative terminal post 23 has a screw hole, and the second fixing part 251 has a through hole. The second fixing part 251 is fixed to the top surface of the negative terminal post 23 by bolts. The third connecting part 252 and the fourth connecting part 253 are respectively pressed into the negative terminals of two adjacent cells 21.

[0036] In this embodiment, the positive busbar 24 and the positive terminal 22, and the negative busbar 25 and the negative terminal 23 are fixedly connected by bolts. When it is necessary to replace the battery cell 21, the bolts can be loosened and the positive busbar 24 and the negative busbar 25 can be removed to take out the battery cell 21, which greatly improves maintenance efficiency. Moreover, the bolt connection has high strength and can withstand greater vibration and impact, ensuring the stability of the connection between the positive busbar 24, the positive terminal 22 and the positive terminal of the battery cell 21, and the negative busbar 25, the negative terminal 23 and the negative terminal of the battery cell 21, reducing the risk of failure due to poor connection.

[0037] Furthermore, the first connecting portion 242 has a first connecting tooth 2421 at its end, and the second connecting portion 243 has a second connecting tooth 2431 at its end that matches the tooth shape of the first connecting tooth 2421. Laterally, the second connecting tooth 2431 of each positive busbar 24 and the first tooth of the adjacent positive busbar 24 are sequentially interlocked. Further, laterally, the third connecting portion 252 of each negative busbar 25 and the fourth connecting portion 253 of the adjacent positive busbar 24 are sequentially abutted. In this embodiment, the positive busbars 24 and the negative busbars 25 are interconnected, preventing rotation between the positive and negative busbars 24 and 25.

[0038] Example 3:

[0039] Based on the same inventive concept as Embodiment 2, refer to Figure 6In this embodiment, the series busbar 3 includes a positive nickel plate 31 and a negative nickel plate 32. The positive nickel plate 31 and the negative nickel plate 32 are electrically connected through a connecting wire harness 33. The positive nickel plate 31 and the negative nickel plate 32 are respectively electrically connected to the positive busbar 24 of one parallel cell group 2 and the negative busbar 25 of another adjacent parallel cell group 2. Multiple parallel cell groups 2 are connected in series through multiple series busbars 3. Further, the positive nickel plate 31 is bolted and fixed between the first fixing part 241 and the positive terminal 22, and the negative nickel plate 32 is bolted and fixed between the second fixing part 251 and the negative terminal 23. It should be noted that in this embodiment, the connecting wire harness 33 should be wrapped with an insulating layer to prevent the connecting wire harness 33 from accidentally touching other electrodes of the cell 21.

[0040] Example 4:

[0041] This embodiment describes a car including any of the battery packs in Embodiments 1 to 3.

[0042] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure / application, and these improvements and modifications should also be considered within the protection scope of this disclosure / application.

Claims

1. A battery pack, characterized in that, include: A packaging base (1) is provided with a plurality of longitudinally arranged parallel cell groups (2). Each parallel cell group (2) includes a plurality of transversely arranged cells (21). A positive terminal (22) and a negative terminal (23) are symmetrically arranged between every two adjacent cells (21). The positive terminal (22) and the negative terminal (23) both have an arc surface that fits against the two adjacent cells (21). The bottom of the positive terminal (22) and the negative terminal (23) The positive terminal (22) is fixedly mounted on the encapsulation base (1); a positive busbar (24) is detachably mounted on the positive terminal (22), and the positive busbar (24) is electrically connected to the positive terminals of the two adjacent cells (21); a negative busbar (25) is detachably mounted on the negative terminal (23), and the negative busbar (25) is electrically connected to the negative terminals of the two adjacent cells (21); two adjacent parallel cell groups (2) are connected in series through a series busbar (3).

2. The battery pack according to claim 1, characterized in that, The positive busbar (24) has a first fixing part (241), a first connecting part (242) and a second connecting part (243). The top surface of the positive terminal post (22) has a screw hole. The first fixing part (241) has a through hole. The first fixing part (241) is fixed to the top surface of the positive terminal post (22) by bolts. The first connecting part (242) and the second connecting part (243) are respectively pressed into the positive terminals of the two adjacent cells (21).

3. The battery pack according to claim 2, characterized in that, The negative busbar (25) has a second fixing part (251), a third connecting part (252) and a fourth connecting part (253). The top surface of the negative terminal post (23) has a screw hole. The second fixing part (251) has a through hole. The second fixing part (251) is fixed to the top surface of the negative terminal post (23) by bolts. The third connecting part (252) and the fourth connecting part (253) are respectively pressed into the negative terminals of the two adjacent cells (21).

4. The battery pack according to claim 3, characterized in that, The series bus (3) includes a positive nickel plate (31) and a negative nickel plate (32). The positive nickel plate (31) and the negative nickel plate (32) are electrically connected through a connecting wire harness (33). The positive nickel plate (31) and the negative nickel plate (32) are respectively electrically connected to the positive bus (24) of one parallel cell group (2) and the negative bus (25) of another adjacent parallel cell group (2). Multiple parallel cell groups (2) are connected in series through multiple series bus (3).

5. The battery pack according to claim 4, characterized in that, The positive electrode nickel sheet (31) is pressed and fixed between the first fixing part (241) and the positive electrode post (22) by the bolt, and the negative electrode nickel sheet (32) is pressed and fixed between the second fixing part (251) and the negative electrode post (23) by the bolt.

6. The battery pack according to claim 2, characterized in that, The first connecting part (242) has a first connecting tooth (2421) at its end, and the second connecting part (243) has a second connecting tooth (2431) at its end that matches the tooth shape of the first connecting tooth (2421). In the transverse direction, the second connecting tooth (2431) of each positive busbar (24) and the first tooth of the other positive busbar (24) adjacent to it are sequentially interlocked.

7. The battery pack according to claim 3, characterized in that, In the lateral direction, the third connection portion (252) of each of the negative busbars (25) and the fourth connection portion (253) of the adjacent positive busbar (24) abut against each other in sequence.

8. A car, characterized in that, Includes the battery pack as described in any one of claims 1-7.

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