A welded structure and an energy storage battery pack

Abstract

The utility model belongs to the related technical field of energy storage battery especially, relate to a kind of welding structure and energy storage battery package. Through in connecting box body, for welding and being provided with first baffle and second baffle and being provided with connecting cavity between them, first connecting cavity and second connecting cavity are provided in connecting cavity;And being provided with first connecting assembly, being provided with first connecting piece, first connecting piece one end is provided with first welding part, and first welding part is arranged in first connecting cavity;Second connecting assembly, being provided with second connecting piece, second connecting piece one end is provided with second welding part, and second welding part is arranged in second connecting cavity;Among them, limit component is arranged between first connecting cavity and second connecting cavity, welding groove is arranged between limit component, and first welding part and second welding part are welded in welding groove. To solve the problem that battery energy storage package and nickel sheet connection can be easily broken and unstable under the unstable operation environment of high-frequency vibration.

Description

Technical Field

[0001] This utility model belongs to the technical field of energy storage batteries, and in particular relates to a welding structure and an energy storage battery pack. Background Technology

[0002] In the structure of a battery pack, the busbar is usually the core conductive component that enables the collection, distribution and transmission of electrical energy from the cells. The stability of its connection with the battery pack determines the charging and discharging efficiency, safety and stability of the battery pack.

[0003] In existing technologies, the busbar and the battery pack body are typically connected via a nickel strip structure to collect the voltage of individual battery cells. The nickel strip is crimped to the wiring harness. In some high-frequency vibration scenarios, this method, relying solely on welding, is prone to welding instability. In other existing technologies, to accommodate different cell heights and overall heights, a non-fixed wiring harness isolation plate is often used to isolate the cell and busbar while simultaneously constraining the wiring harness routing. This requires the wiring harness isolation plate to fix the nickel strip for efficient welding. However, with the wiring harness isolation plate not fixed and the nickel strip fixed to the cell busbar, breakage is likely to occur at the crimping point between the nickel strip and the wiring harness during transport and other vibration-prone conditions.

[0004] Therefore, existing technologies cannot solve the problem that the connection between the battery energy storage pack and the nickel sheet is prone to breakage and unstable in the unstable operating environment of high-frequency vibration. Utility Model Content

[0005] To address the problem that "in the unstable operating environment of high-frequency vibration, the connection between the battery energy storage pack and the nickel sheet is prone to breakage and the connection is unstable," this utility model proposes a welding structure and an energy storage battery pack.

[0006] This utility model solves the above problems through the following technical solution: In a first aspect, this utility model proposes a welding structure, comprising: The connecting box has a first isolation plate and a second isolation plate inside, which are arranged opposite to each other. A connecting cavity is provided between the first isolation plate and the second isolation plate, and a first connecting cavity and a second connecting cavity are provided inside the connecting cavity. The first connecting component is provided with a first connector, one end of which is provided with a first welding part, which is disposed in the first connecting cavity; The second connecting component is provided with a second connector, one end of which is provided with a second welding part, which is located inside the second connecting cavity; A limiting component is provided between the first connecting cavity and the second connecting cavity, and a welding groove is provided between the limiting components. The first welding part and the second welding part are welded in the welding groove.

[0007] A connecting box is constructed, in which a first and a second isolation plate are welded and disposed, with a connecting cavity between them. The connecting cavity contains a first connecting chamber and a second connecting chamber. A first connecting assembly is provided, consisting of a first connector with a first welding portion at one end, located within the first connecting cavity. A second connecting assembly is also provided, consisting of a second connector with a second welding portion at one end, located within the second connecting cavity. A limiting assembly is provided between the first and second connecting cavities, and a welding groove is provided between the limiting assembly. The first and second welding portions are welded within this welding groove. This design addresses the issue of easy breakage and unstable connection between the battery storage pack and the nickel sheet under unstable operating conditions caused by high-frequency vibration.

[0008] In some embodiments, the limiting component includes a first limiting member and a second limiting member; The first limiting member and the second limiting member are arranged opposite to each other, and the welding groove is arranged between the first limiting member and the second limiting member.

[0009] In some embodiments, the first and second limiting members are configured as limiting protrusions.

[0010] In some implementations, the length of the limiting protrusion is 0.8 to 3 mm.

[0011] In some embodiments, the length of the first connecting cavity is 0-4 mm.

[0012] In some implementations, the length of the second connecting cavity is 2-4 mm.

[0013] In some implementations, the limiting component is configured as a limiting ring, and the welding groove is located at the center of the limiting ring.

[0014] In some embodiments, the connecting box body is further provided with a third connecting cavity, which is connected to the first connecting cavity. The first connecting assembly also includes a sampling line, and a first welding part is provided at the end of the sampling line, which is disposed in the third connecting cavity.

[0015] In some embodiments, the second connecting assembly further includes a nickel sheet, with a second welding portion disposed at one end of the nickel sheet, which is disposed outside the connecting housing.

[0016] In a second aspect, this utility model proposes an energy storage battery pack, including a welded structure, a battery pack assembly, a bus assembly, and a housing as described in any of the first aspects; The box body is equipped with a fixing frame inside, the busbar assembly is set inside the fixing frame, the battery pack assembly is set outside the fixing frame, the connecting box is set on one side of the fixing frame, and a connecting groove is set between the fixing frame and the connecting box. The connecting end of the busbar is electrically connected to the second connecting component, the second connecting component is set in the connecting groove, and the first connecting component is connected to the battery pack body cell, so that the battery pack assembly and the busbar assembly are welded through a welding structure.

[0017] The beneficial effects of this utility model's welding structure and energy storage battery pack are: A connecting box is constructed, in which a first and a second isolation plate are welded and disposed, with a connecting cavity between them. The connecting cavity contains a first connecting chamber and a second connecting chamber. A first connecting assembly is provided, consisting of a first connector with a first welding portion at one end, located within the first connecting cavity. A second connecting assembly is also provided, consisting of a second connector with a second welding portion at one end, located within the second connecting cavity. A limiting assembly is provided between the first and second connecting cavities, and a welding groove is provided between the limiting assembly. The first and second welding portions are welded within this welding groove. This design addresses the issue of easy breakage and unstable connection between the battery storage pack and the nickel sheet under unstable operating conditions caused by high-frequency vibration. Attached Figure Description

[0018] Figure 1 This is a top view of a welding structure according to the present invention; Figure 2 for Figure 1 Enlarged view of part a; Figure 3 This is a structural diagram of the connecting box part of a welding structure according to the present invention; Figure 4 This is a top view of an energy storage battery pack according to the present invention.

[0019] Figure label: 1. Connecting box body; 11. First isolation plate; 12. Second isolation plate; 13. Connecting cavity; 131. First connecting cavity; 132. Second connecting cavity; 133. Third connecting cavity; 14. Limiting assembly; 141. First limiting member; 142. Second limiting member; 143. Welding groove; 2. First connecting component; 21. First connector; 3. Second connecting component; 32. Second connecting piece; 4. Box body; 5. Busbar assembly; 6. Battery pack assembly. Detailed implementation method: It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of this utility model can be combined with each other. The detailed description in the specific embodiments should be understood as an explanation of the spirit of this utility model and should not be regarded as an improper limitation of this utility model.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the specific technical solutions of this utility model will be further described in detail below with reference to the accompanying drawings of the embodiments of this utility model. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] In the embodiments of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] Furthermore, in this embodiment of the invention, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0023] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0024] In embodiments of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0025] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant information in a specific manner.

[0026] Example 1: like Figure 1As shown, this embodiment proposes a welding structure, which in some implementations includes: The connecting box 1 has a first isolation plate 11 and a second isolation plate 12 inside. The first isolation plate 11 and the second isolation plate 12 are arranged opposite to each other. A connecting cavity 13 is provided between the first isolation plate 11 and the second isolation plate 12. A first connecting cavity 131 and a second connecting cavity 132 are provided inside the connecting cavity 13. The first connecting component 2 is provided with a first connector 21, one end of which is provided with a first welding part (not shown in the figure), and the first welding part is disposed in the first connecting cavity 131; The second connecting component 3 is provided with a second connecting member 32. One end of the second connecting member 32 is provided with a second welding part (not shown in the figure), and the second welding part is located in the second connecting cavity 132. A limiting component 14 is provided between the first connecting cavity 131 and the second connecting cavity 132, and a welding groove 143 is provided between the limiting components 14. The first welding part and the second welding part are welded in the welding groove 143.

[0027] Specifically, a connecting box 1 is provided to accommodate the first connecting component 2 and the second connecting component 3 for welding. The connecting box 1 contains a first isolation plate 11 and a second isolation plate 12, forming a connecting cavity 13 for welding. The first isolation plate 11 and the second isolation plate 12 not only improve the stability of the first connecting component 2 and the second connecting component 3 during welding, thus reducing vibration in high-vibration environments, but also serve to fix the first connecting component 2 and the second connecting component 3, thereby improving welding efficiency. The first connecting cavity 131 and the second connecting cavity 132 within the connecting cavity 13 are used to accommodate the first welding portion of the first welded component and the second welding portion of the second welded component, respectively. The sizes of the first connecting cavity 131 and the second connecting cavity 132 may differ. Generally, the second connecting cavity 132 is typically used for the second welding portion of the nickel sheet connecting the busbar, while the first connecting cavity 131 is typically used for the first welding portion of the voltage sampling line of the battery pack. In a preferred embodiment, the length of the second connecting cavity 132 is greater than the length of the first connecting cavity 131, so as to increase the length of the welding part of the nickel sheet and further increase the length of the second welding part of the nickel sheet and the welding stability.

[0028] The first connecting component 2 is typically a battery pack connecting component, and the second connecting component 3 is typically a bus connecting component. The first connecting member 21 of the first connecting component 2 has a first welding part for welding, which can be a metal welding part or a structure such as a wire harness. The second connecting member 32 of the second connecting component 3 has a second welding part for welding, which is typically a metal part extending from the second connecting member 32 for welding. The second welding part can be set as a hollow cylindrical structure so that when the first welding part is a wire harness, by extending the wire harness into the cylindrical structure and pressing the cylindrical structure of the second welding part, the second welding part is pressed into the first welding part and further welded, thereby improving the welding stability.

[0029] To improve welding stability and better address the problem of easy breakage and unstable connection between the battery storage pack and nickel sheet in unstable operating environments with high-frequency vibration, this application also provides a limiting component 14 in the first connecting cavity 131 and the second connecting cavity 132. The limiting component 14 can further limit the first and second welding parts disposed in the connecting cavity 13, thereby reducing the shaking of the first and second limiting parts welded in the welding groove 143, thus solving the problem of easy breakage and unstable connection between the battery storage pack and nickel sheet in unstable operating environments with high-frequency vibration.

[0030] A first connecting plate 11 and a second connecting plate 12 are welded together, with a connecting cavity 13 between them. The connecting cavity 13 contains a first connecting cavity 131 and a second connecting cavity 132. A first connecting assembly 2 is provided, consisting of a first connecting member 21 with a first welding portion at one end, located within the first connecting cavity 131. A second connecting assembly 3 is provided, consisting of a second connecting member 32 with a second welding portion at one end, located within the second connecting cavity 132. A limiting assembly 14 is provided between the first connecting cavity 131 and the second connecting cavity 132, and a welding groove 143 is provided between the limiting assemblies 14. The first welding portion and the second welding portion are welded within the welding groove 143. This design addresses the problem of easy breakage and unstable connection between the battery storage pack and the nickel sheet under unstable operating conditions caused by high-frequency vibration.

[0031] Example 2: like Figures 2-3 As shown, this embodiment further optimizes and explains the structure proposed in Embodiment 1: In some embodiments, the limiting component 14 includes a first limiting member 141 and a second limiting member 142; The first limiting member 141 and the second limiting member 142 are arranged opposite to each other, and the welding groove 143 is arranged between the first limiting member 141 and the second limiting member 142.

[0032] Specifically, the limiting component 14 includes a first limiting member 141 and a second limiting member 142. The first limiting member 141 and the second limiting member 142 are arranged opposite to each other to provide relative support force against the weld of the first weld and the second weld, thereby solving the problem that the connection between the battery energy storage pack and the nickel sheet is prone to breakage and unstable in the unstable operating environment of high frequency vibration in the prior art.

[0033] In some embodiments, the first limiting member 141 and the second limiting member 142 are configured as limiting protrusions.

[0034] Specifically, the shape of the limiting protrusion can be any of the following: rectangle, circle, triangle, etc. Preferably, the limiting protrusion is rectangular. The rectangular limiting protrusion can solve the problem that the connection between the battery energy storage pack and the nickel sheet is prone to breakage and unstable in the unstable operating environment of high frequency vibration.

[0035] In some embodiments, the length of the limiting protrusion is 0.8~3mm.

[0036] Specifically, a protrusion smaller than 0.8mm will make the position of the limiting protrusion against the first and second welding parts too sharp, resulting in wear of the welding parts during high-frequency vibration. A limiting protrusion larger than 3mm will make the position of the limiting protrusion against the first and second welding parts too large, thereby increasing the difficulty of production welding and hindering efficient production. At the same time, an excessively large limiting protrusion will increase the mechanical stress between the welding position of the first and second welding parts and the limiting protrusion, resulting in mechanical wear in high-vibration operating environments.

[0037] In some embodiments, the length of the first connecting cavity 131 is 0~4mm.

[0038] Specifically, in unstable operating environments with high-frequency vibration, the connection between the battery storage pack and the nickel plate is prone to breakage and instability. The second connecting cavity 132 is the most effective solution. However, to further address this issue, a first connecting cavity 131 is added. While the second connecting cavity 132 can mitigate the problem to some extent when the first connecting cavity 131 is close to 0mm, it still contributes to the instability of the first connecting assembly 2. Therefore, the first connecting cavity 131 is positioned as close as possible to 4mm. In a more preferred embodiment, the length of the first connecting cavity 131 is less than or equal to the length of the second connecting cavity 132.

[0039] In some embodiments, the length of the second connecting cavity 132 is 2~4mm.

[0040] Specifically, the length of the second connecting cavity 132 is usually greater than the length of the first connecting cavity 131, in order to better solve the problem that the connection between the battery energy storage pack and the nickel sheet is prone to breakage and unstable under the unstable operating environment of high frequency vibration.

[0041] In some embodiments, the limiting component 14 is configured as a limiting ring, and the welding groove 143 is disposed at the center of the limiting ring.

[0042] Specifically, by using a limiting ring with a welding groove 143, the first and second welding parts can be limited within the limiting ring, thus solving the problem that the connection between the battery energy storage pack and the nickel sheet is prone to breakage and unstable under the unstable operating environment of high-frequency vibration in the existing technology.

[0043] In some embodiments, the connecting box 1 is further provided with a third connecting cavity 133, which is connected to the first connecting cavity 131. The first connecting assembly 2 also includes a sampling line, a first welding part is provided at the end of the sampling line, and the sampling line is provided in the third connecting cavity 133.

[0044] Specifically, the third connecting cavity 133 is disposed on one side of the first connecting cavity 131 and connected to the first connecting cavity 131, thereby enabling the first connecting assembly 2 to be disposed within the first connecting cavity 131, including the sampling line and other structures such as the sampling line fixing components. Through the third connecting cavity 133, the vibration of the sampling line in high-vibration environments can be reduced, thereby solving the problem that the connection between the battery energy storage pack and the nickel sheet is prone to breakage and unstable in the unstable operating environment of high-frequency vibration in the prior art.

[0045] In some embodiments, the second connecting component 3 further includes a nickel sheet, a second welding portion is disposed at one end of the nickel sheet, and the nickel sheet is disposed outside the connecting housing 1.

[0046] Specifically, the second connecting component 3 is typically a busbar connector, primarily comprising a nickel plate. The nickel plate extends the electrical connection end of the busbar and connects it to the first connecting component 2, more specifically, to the sampling line, thereby electrically connecting the busbar and the battery. The nickel plate is disposed outside the connecting housing 1, and its second welded portion is part of the nickel plate, extending into the connecting cavity 13 and connecting to the sampling line at the connecting groove.

[0047] Example 3: like Figure 4 As shown, this embodiment proposes an energy storage battery pack, including a welded structure as described in any one of Embodiments 1 and 2, a battery pack assembly 6, a bus assembly 5, and a housing 4; The box 4 has a fixed frame inside, the busbar assembly 5 is set inside the fixed frame, the battery pack assembly 6 is set outside the fixed frame, the connecting box 1 is set on one side of the fixed frame, and a connecting groove is set between the fixed frame and the connecting box 1. The connecting end of the busbar is electrically connected to the second connecting component 3. The second connecting component 3 is set in the connecting groove, and the first connecting component 2 is connected to the battery pack body cell so that the battery pack assembly 6 and the busbar assembly 5 are welded by a welding structure.

[0048] The serial numbers of the utility model embodiments are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are only preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.

Claims

1. A welded structure, characterized in that, include: The connecting box (1) is provided with a first isolation plate (11) and a second isolation plate (12) inside. The first isolation plate (11) and the second isolation plate (12) are arranged opposite to each other. A connecting cavity (13) is provided between the first isolation plate (11) and the second isolation plate (12). A first connecting cavity (131) and a second connecting cavity (132) are provided inside the connecting cavity (13). The first connecting component (2) is provided with a first connector (21), one end of which is provided with a first welding part, which is disposed within the first connecting cavity (131); and The second connecting component (3) is provided with a second connector (32), one end of which is provided with a second welding part, which is disposed in the second connecting cavity (132); Wherein, a limiting component (14) is provided between the first connecting cavity (131) and the second connecting cavity (132), and a welding groove (143) is provided between the limiting components (14), and the first welding part and the second welding part are welded in the welding groove (143).

2. The welded structure according to claim 1, characterized in that, The limiting component (14) includes a first limiting member (141) and a second limiting member (142). The first limiting member (141) and the second limiting member (142) are arranged opposite to each other, and the welding groove (143) is arranged between the first limiting member (141) and the second limiting member (142).

3. The welded structure according to claim 2, characterized in that, The first limiting member (141) and the second limiting member (142) are configured as limiting protrusions.

4. The welded structure according to claim 3, characterized in that, The length of the limiting protrusion is 0.8~3mm.

5. The welded structure according to claim 3, characterized in that, The length of the first connecting cavity (131) is 0~4mm.

6. The welded structure according to claim 3, characterized in that, The length of the second connecting cavity (132) is 2~4mm.

7. The welded structure according to claim 1, characterized in that, The limiting component (14) is configured as a limiting ring, and the welding groove (143) is located at the center of the limiting ring.

8. The welded structure according to claim 1, characterized in that, The connecting box (1) is also provided with a third connecting cavity (133), which is connected to the first connecting cavity (131). The first connecting assembly (2) also includes a sampling line, the first welding part is provided at the end of the sampling line, and the sampling line is provided in the third connecting cavity (133).

9. The welded structure according to claim 1, characterized in that, The second connecting component (3) further includes a nickel sheet, and the second welding part is disposed at one end of the nickel sheet, which is disposed outside the connecting box (1).

10. An energy storage battery pack, characterized in that, Includes a welding structure as described in any one of claims 1-9, a battery pack assembly (6), a bus assembly (5), and a housing (4); The box body (4) is provided with a fixing frame inside, the busbar assembly (5) is provided inside the fixing frame, the battery pack assembly (6) is provided outside the fixing frame, the connecting box body (1) is provided on one side of the fixing frame, and a connecting groove is provided between the fixing frame and the connecting box body (1). The connecting end of the busbar is electrically connected to the second connecting component (3), the second connecting component (3) is provided in the connecting groove, and the first connecting component (2) is connected to the battery pack body cell so that the battery pack assembly (6) and the busbar assembly (5) are welded through the welding structure.

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