Battery pack

By setting up a clamping part in the wiring harness isolation frame of the battery pack, the elastic part deformation absorbs the gap difference between the busbar and the battery cell, the problems of busbar deformation and unsolid welding are solved, and the yield and welding of the battery pack are improved. stability.

CN222261306UActive Publication Date: 2024-12-27TOYOTA JIDOSHA KK
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202420723322.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-09
Publication Date
2024-12-27
Estimated Expiration
2034-04-09

AI Technical Summary

Technical Problem

In existing battery packs, due to different battery cells heights and different gaps between the busbar and the battery pack, the busbar is deformed, broken and unsolid welding, which reduces the yield rate of the battery pack.

Method used

A battery pack is designed, wherein a clamping part is provided on the inner surface of the wire harness isolation frame, including a limiting part and an elastic part, and the busbar is located between the limiting part and the elastic part, and the elastic part makes the busbar and electrical through elastic or plastic deformation. The core terminals are welded together to absorb gap differences and improve welding firmness.

Benefits of technology

It effectively avoids deformation and breakage of busbars, improves the welding firmness and yield of the battery pack, adapts to changes in height differences between battery cell terminals, and enhances the stability of the battery pack.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222261306U_ABST
    Figure CN222261306U_ABST
Patent Text Reader

Abstract

The utility model discloses a battery pack. The battery pack comprises a wire harness isolation frame, two opposite inner surfaces of the wire harness isolation frame are respectively provided with a clamping part, and each clamping part comprises a limiting part and an elastic part located below the limiting part; the busbar is clamped between the limiting part and the elastic part; the battery cell is positioned below the busbar and comprises a battery cell body and a battery cell terminal; wherein the elastic part is used for eliminating an overlarge gap between the busbar and the battery cell terminal and welding the busbar and the battery cell terminal together through the elastic or plastic deformation of the elastic part. According to the battery pack, not only can the busbar be prevented from being deformed and broken, but also overlarge gaps between the battery cell terminals and the busbar can be absorbed through deformation of the elastic parts aiming at the problem of overlarge height difference between the battery cell terminals in the battery module stacking process, so that the welding firmness is improved, and the yield of the battery pack is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] like Figure 1 As shown, in the prior art, due to the different heights of the battery cells 3 in the battery pack, there are gaps of different sizes between the busbar 2 and the battery cells 3 that are clamped in the wiring harness isolation frame 1. When the busbar 2 is welded to the battery cell terminal, if the gap between the busbar 2 and the battery cell terminal is too large, it will not only cause the busbar 2 to deform and break, but also cause the welding between the busbar 2 and the battery cell terminal to be loose, thereby causing the yield rate of the battery pack to decrease. Therefore, the smaller the gap between the busbar and the battery cell, the higher the yield rate of the battery pack. Utility Model Content

[0003] In view of this, an embodiment of the utility model provides a battery pack to solve the technical problems of busbar deformation, breakage and loose welding.

[0004] To achieve the above objectives, the present invention provides a battery pack, comprising:

[0005] A wire harness isolation frame, wherein two opposite inner surfaces of the wire harness isolation frame are respectively provided with clamping parts, and the clamping parts include a limiting part and an elastic part located below the limiting part;

[0006] A bus bar is located in the wiring harness isolation frame and is clamped between the limiting portion and the elastic portion;

[0007] A battery cell, located below the bus bar, comprising a battery cell body and a battery cell terminal;

[0008] The elastic part is elastically or plastically deformed to weld the busbar and the cell terminal together.

[0009] Optionally, when the elastic part does not undergo elastic or plastic deformation, the elastic part is inclined upward along the height direction of the battery pack; when the elastic part undergoes elastic or plastic deformation, the elastic part is inclined upward, horizontal or downward along the height direction of the battery pack.

[0010] Optionally, when the elastic portion does not undergo elastic or plastic deformation, an angle between the elastic portion and the inner surface of the wire harness isolation frame is 5-45 degrees.

[0011] Optionally, the clamping portion includes a limiting portion and at least one elastic portion.

[0012] Optionally, the clamping portion includes a limiting portion and two elastic portions, and the two elastic portions are symmetrically arranged on both sides of the limiting portion.

[0013] Optionally, each inner surface of the wire harness isolation frame is provided with the clamping portion.

[0014] Optionally, the other two opposite inner surfaces of the wire harness isolation frame are respectively provided with only the elastic parts.

[0015] Optionally, the bottom surface of the limiting portion is horizontal.

[0016] Optionally, the elastic portion is in a sheet shape.

[0017] Optionally, the wire harness isolation frame is made of resin.

[0018] In the embodiment of the utility model, clamping parts are respectively arranged on two relative inner surfaces of the wiring harness isolation frame, and the clamping parts clamp the bus so that the bus is positioned in the wiring harness isolation frame. Moreover, since the elastic part can undergo elastic or plastic deformation, if the gap between the bus and the battery cell terminal is too large, the elastic part can undergo elastic or plastic deformation to weld the bus and the battery cell terminal together, thereby avoiding deformation and breakage of the bus. In addition, in order to address the problem of excessive height difference between the battery cell terminals during battery module stacking, the elastic part can be deformed to absorb the excessive gap between the battery cell terminal and the bus, thereby improving the welding firmness and thus improving the yield rate of the battery pack.

[0019] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the installation of a busbar and a cell terminal clamped in a wiring harness isolation plate in the prior art;

[0022] Figure 2 It is a structural schematic diagram of a wiring harness isolation plate and a bus bar according to an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the installation of the busbar and the battery cell terminals clamped in the wiring harness isolation plate according to the first embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the installation of the busbar and the battery cell terminals clamped in the wiring harness isolation plate according to the second embodiment of the utility model;

[0025] Figure 5 is a partial enlarged view of the busbar and the cell terminal according to the second embodiment of the utility model;

[0026] Figure 6 is a schematic diagram of the three-dimensional structure of a wiring harness isolation plate according to a third embodiment of the utility model;

[0027] Figure 7 It is a schematic structural diagram of the third inner surface of the wiring harness isolation plate according to the third embodiment of the utility model.

[0028] The reference numerals are as follows:

[0029] 1-Wire harness isolation frame;

[0030] 11- a first inner surface;

[0031] 12- second inner surface;

[0032] 13- third inner surface;

[0033] 14- fourth inner surface;

[0034] 2- busbar;

[0035] 3-Battery cell;

[0036] 31-battery body;

[0037] 32-cell terminal;

[0038] 4- clamping part;

[0039] 41-limiting part;

[0040] 42-Elastic portion. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] The utility model embodiment provides a battery pack, such as Figure 2-5 As shown, the battery pack includes a wire harness isolation frame 1, a busbar 2 and a battery cell 3. The two opposite inner surfaces of the wire harness isolation frame 1 are respectively provided with clamping parts 4, each clamping part 4 includes a limiting part 41 and an elastic part 42 located below the limiting part 41; the busbar 2 is located in the wire harness isolation frame 1 and is clamped between the limiting part 41 and the elastic part 42, and the battery cell 3 is located below the busbar 2, and the battery cell 3 includes a battery cell body 31 and a battery cell terminal 32. Among them, the elastic part 42 eliminates the excessive gap between the busbar 2 and the battery cell terminal 32 by elastic or plastic deformation.

[0045] In the embodiment of the utility model, clamping parts 4 are respectively provided on two relative inner surfaces of the wiring harness isolation frame 1, and the bus 2 is clamped by the clamping parts 4 so that the bus 2 is positioned in the wiring harness isolation frame 1. Moreover, since the elastic part 42 can undergo elastic or plastic deformation, if the gap between the bus 2 and the battery cell terminal 32 is too large, the elastic part 42 can undergo elastic or plastic deformation to weld the bus 2 and the battery cell terminal 32 together, thereby avoiding deformation and breakage of the bus 2. In addition, in order to address the problem of excessive height difference between the battery cell terminals during battery module stacking, the excessive gap between the battery cell terminal and the bus can be absorbed by the deformation of the elastic part, thereby improving the welding firmness and thus improving the yield rate of the battery pack.

[0046] When the elastic portion 42 does not undergo elastic or plastic deformation, the clamping portion 4 plays a role in positioning the busbar 2. The busbar 2 is positioned in the wiring harness isolation frame 1 through the clamping portion 4. Figure 2It should be noted that if the height difference between two adjacent battery cells 3 in the battery pack is small, that is, the gap between the bus bar 2 and the battery cell terminals 32 of the two adjacent battery cells 3 is small, then the elastic portion 42 will not undergo elastic or plastic deformation or the elastic or plastic deformation will be small, such as Figure 3 However, if the height difference between two adjacent cells 3 in the battery pack is large, so that the gap between the busbar 2 and the cell terminal 32 of one of the cells 3 is large, the elastic part 42 will undergo elastic or plastic deformation and the elastic or plastic deformation will be large. The gap between the busbar 2 and the cell terminal 32 is absorbed by the elastic or plastic deformation of the elastic part 42, so that the gap between the busbar 2 and the cell terminal 32 is basically eliminated, thereby preventing the busbar 2 from being deformed or broken and allowing the busbar 2 and the cell terminal 32 to be firmly welded together, as shown in FIG. Figure 4 shown.

[0047] In some embodiments of the present invention, when the elastic portion 42 does not undergo elastic or plastic deformation, the elastic portion 42 is inclined upward along the height direction of the battery pack; when the elastic portion 42 undergoes elastic or plastic deformation, the elastic portion 42 is inclined upward, horizontal, or downward along the height direction of the battery pack. Figure 3 As shown, if the gap between the busbar 2 and the cell terminals 32 of two adjacent battery cells 3 is small, the elastic portion 42 will not undergo elastic or plastic deformation. In this case, the elastic portion 42 is tilted upward along the height direction of the battery pack, which can improve the clamping firmness of the clamping portion 4 to the busbar 2, so that the busbar 2 can be stably clamped to the wiring harness isolation frame 1. If the gap between the busbar 2 and the cell terminals 32 of one of the battery cells 3 is large, the elastic portion 42 will undergo elastic or plastic deformation. In this case, along the height direction of the battery pack, the elastic portion 42 is tilted upward, horizontally, or downward according to the amount of deformation, so that the gap between the busbar 2 and the cell terminals 32 basically disappears, thereby preventing the busbar 2 from being deformed or broken and allowing the busbar 2 and the cell terminals 32 to be firmly welded together. Among them, Figure 4-5 The downward tilting situation is shown, at which time the elastic portion 42 undergoes a large elastic or plastic deformation.

[0048] Optionally, when the elastic portion 42 does not undergo elastic or plastic deformation, the angle between the elastic portion 42 and the inner surface of the wiring harness isolation frame 1 is 5-45 degrees, which helps to improve the firmness of the clamping portion 4 on the bus 2, so that the bus 2 can be stably clamped on the wiring harness isolation frame 1.

[0049] In some embodiments of the utility model, the clamping portion 4 includes a limiting portion 41 and at least one elastic portion 42, for example, each clamping portion 4 includes a limiting portion 41 and an elastic portion 42 located below the limiting portion 41, or each clamping portion 4 includes a limiting portion 41 and two elastic portions 42 located below the limiting portion 41, or each clamping portion 4 includes a limiting portion 41 and three elastic portions 42 located below the limiting portion 41, and the utility model embodiment does not limit this. Providing multiple elastic portions 42 below the limiting portion 41 can ensure that when the elastic portion 42 undergoes a large elastic or plastic deformation, the elastic portion 42 can still effectively support the bus 2 and prevent the bus 2 from falling from the wiring harness isolation frame 1.

[0050] Alternatively, if Figure 6-7 As shown, each clamping portion 4 includes a limiting portion 41 and two elastic portions 42, and the two elastic portions 42 are symmetrically arranged on both sides of the limiting portion 41. This ensures that when the elastic portion 42 undergoes a large elastic or plastic deformation, the elastic portion 42 can still effectively support the bus 2 and prevent the bus 2 from falling from the wiring harness isolation frame 1, while also not increasing the processing complexity of the wiring harness isolation frame 1.

[0051] In some embodiments of the present invention, Figure 6-7 As shown, each inner surface of the wiring harness isolation frame 1 is provided with a clamping portion 4. For example, the first inner surface 11, the second inner surface 12, the third inner surface 13 and the fourth inner surface 14 of the wiring harness isolation frame 1 are all provided with a clamping portion 4, which helps to increase the gap range that can be absorbed by the elastic portion 42. No matter whether the gap between the bus 2 and the battery terminal 32 is large or small, the gap can be absorbed by the elastic portions 42 around it, and at the same time, it can prevent the bus 2 from falling from the wiring harness isolation frame 1.

[0052] In some embodiments of the present invention, Figure 6-7As shown, two relative inner surfaces (the first inner surface 11 and the second inner surface 12) of the wire harness isolation frame 1 are respectively provided with a clamping portion 4, and the other two relative inner surfaces (the third inner surface 13 and the fourth inner surface 14) of the wire harness isolation frame 1 are respectively provided with only an elastic portion 42, the main purpose of which is to facilitate the connection of the bus 2 to the wire harness isolation frame 1, and at the same time will not increase the processing complexity of the wire harness isolation frame 1. It should be noted that one or more elastic portions 42 can be provided on the third inner surface 13 and the fourth inner surface 14, and the embodiment of the utility model does not limit this. For example, an elastic portion 42 can be provided on both the third inner surface 13 and the fourth inner surface 14, or two elastic portions 42 can be provided on both the third inner surface 13 and the fourth inner surface 14. It should be noted that, considering that the bus 2 needs to extend from the notch of the wire harness isolation frame 1, two elastic portions 42 are provided on the third inner surface 13, and one elastic portion is provided on the fourth inner surface 14.

[0053] Optionally, the bottom surface of the limiting portion 41 (i.e., the surface close to the bus 2) is horizontal, which helps to increase the surface area of ​​the bottom surface, thereby stably positioning the bus 2. Optionally, the elastic portion 42 is in a sheet shape, so that the elastic portion 42 is easy to deform elastically or plastically. Optionally, the wiring harness isolation frame 1 is made of resin to prevent the battery pack from short-circuiting, thereby ensuring the safety of the battery pack.

[0054] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: include: A wire harness isolation frame, wherein two opposite inner surfaces of the wire harness isolation frame are respectively provided with clamping parts, and the clamping parts include a limiting part and an elastic part located below the limiting part; A bus bar is located in the wiring harness isolation frame and is clamped between the limiting portion and the elastic portion; A battery cell, located below the bus bar, comprising a battery cell body and a battery cell terminal; The elastic part is elastically or plastically deformed to weld the busbar and the cell terminal together.

2. The battery pack according to claim 1, characterized in that: When the elastic part does not undergo elastic or plastic deformation, the elastic part is inclined upward along the height direction of the battery pack; when the elastic part undergoes elastic or plastic deformation, the elastic part is inclined upward, horizontal or downward along the height direction of the battery pack.

3. The battery pack according to claim 2, characterized in that: When the elastic portion does not undergo elastic or plastic deformation, the angle between the elastic portion and the inner surface of the wire harness isolation frame is 5-45 degrees.

4. The battery pack according to claim 1, characterized in that: The clamping portion includes a limiting portion and at least one elastic portion.

5. The battery pack according to claim 4, characterized in that: The clamping portion includes a limiting portion and two elastic portions, and the two elastic portions are symmetrically arranged on both sides of the limiting portion.

6. The battery pack according to claim 1, characterized in that: Each inner surface of the wire harness isolation frame is provided with the clamping portion.

7. The battery pack according to claim 1, characterized in that: The other two opposite inner surfaces of the wire harness isolation frame are respectively provided with only the elastic parts.

8. The battery pack according to claim 1, characterized in that: The bottom surface of the limiting portion is horizontal.

9. The battery pack according to claim 1, characterized in that: The elastic part is in sheet shape.

10. The battery pack according to claim 1, characterized in that: The wire harness isolation frame is made of resin.