Encapsulated energy storage battery pack

Abstract

The utility model relates to a potting energy storage battery pack, and aims to solve the problems of unstable fixation of battery cells, welding defects and high customization cost in the prior art. The battery pack comprises a box body, a battery module, a battery bracket and a welding bracket, the battery module consists of a plurality of cylindrical battery cells and a busbar, and the battery cells are connected with the busbar through welding surfaces; the battery bracket is provided with at least two groove surfaces and is used for fixing the battery cells, and the adjacent battery cells are connected through the groove surfaces; the welding support is of a groove-shaped structure, the bottom of the welding support is provided with a first positioning hole and a welding platform, and a busbar of a battery cell is accurately welded through the welding platform. According to the utility model, the busbar welding mode of the battery cell is optimized, the instability caused by assembly tolerance is reduced, and the high consistency of a welding surface is ensured, so that the problem of insufficient welding is effectively avoided, and the welding quality and the overall safety of a battery pack are improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery technology, specifically to a potted energy storage battery pack. Background Technology

[0002] Energy storage battery packs, as commonly used energy storage units in power grids, have been widely applied in energy storage systems due to their high energy density and long service life. Small-capacity cylindrical cells are typically used as the smallest energy unit in a battery pack, and multiple cylindrical cells are combined in series and parallel to meet different voltage and capacity requirements. However, with the diversification of energy storage demands, energy storage modules have also emerged in various types and specifications, placing higher demands on the structural design and manufacturing process of battery packs.

[0003] Existing energy storage battery packs typically use two plastic brackets to fix cylindrical battery cells, and the busbars are connected to the cells using single-sided or double-sided welding. Single-sided welding offers higher production efficiency compared to double-sided welding. However, the single-sided welding technique has the following drawbacks in practical applications:

[0004] 1. Custom development has a long cycle and high cost.

[0005] When the series-parallel connection of the cells in an energy storage battery pack changes, the existing plastic support structure needs to be redesigned and customized. The long design and development cycle of plastic molds, coupled with high customization costs, limits the flexibility of the battery pack in diverse application scenarios.

[0006] 2. Assembly tolerances affect structural stability

[0007] During the assembly of battery cells and plastic brackets, assembly tolerances often result in inconsistent welding surface heights between adjacent cells. This unevenness negatively impacts the welding quality of the busbar, increasing the risk of incomplete welds and welding defects. Because the height difference between the busbar and the battery cell may prevent reliable welding contact, incomplete welds become a common problem. Incomplete welds lead to increased contact resistance, which in turn causes localized overheating, potentially resulting in battery pack failure or even a safety accident in severe cases.

[0008] Based on the aforementioned technical challenges, there is an urgent need for an improved energy storage battery pack structure and assembly process to enhance its compatibility, production efficiency, and safety performance, while simultaneously reducing development cycle and costs. The new technological solution should optimize the cell fixing method, improve the design of the welding platform, ensure high consistency of the welding surfaces to avoid defects such as incomplete welds, and provide flexible support for various energy storage application scenarios. Utility Model Content

[0009] The purpose of this invention is to provide a potted energy storage battery pack that uses a welding bracket for busbar welding, thereby solving the problem of uneven welding surfaces of adjacent cells in single-sided welding.

[0010] The objective of this utility model is achieved through the following technical solution: This utility model provides a potted energy storage battery pack, which includes:

[0011] The housing has a positive terminal and a negative terminal;

[0012] A battery module comprising multiple battery cells and a busbar, wherein each battery cell includes a bottom welding surface and a top fixing surface, the multiple welding surfaces are electrically connected to each other via the busbar, and the busbar is connected to the positive terminal and the negative terminal;

[0013] A battery holder, the battery holder including at least two recessed surfaces, with adjacent battery cells connected to the recessed surfaces between the battery holders;

[0014] A welding bracket is provided, which has a groove-shaped structure. The bottom of the welding bracket includes at least one first positioning hole, which penetrates the welding bracket. A welding platform is provided in the first positioning hole, and the welding platform is stepped with the first positioning hole. The battery module is placed in the welding bracket, the battery cell is placed in the first positioning hole, and the welding surface is in close contact with the welding platform to weld the busbar to the welding surface.

[0015] Preferably, the battery cell is cylindrical and the groove is arc-shaped.

[0016] Preferably, the battery bracket further includes a second positioning hole, and a first positioning pin is provided between the first positioning holes of the welding bracket; after the battery cell is placed in the first positioning hole, the first positioning pin is placed in the second positioning hole to fix the welding bracket.

[0017] Furthermore, the battery bracket also includes a second positioning pin, and the second positioning pin and the second positioning hole are provided on opposite sides of the battery bracket; the housing is provided with a third positioning hole, and the battery bracket is connected to the housing through the second positioning pin and the third positioning hole.

[0018] Preferably, the battery bracket further includes a first fixing hole, which is located on the same side of the battery bracket as the second positioning pin; the housing is provided with a second fixing hole, and after the second positioning pin is connected to the third positioning hole, the second fixing hole and the first fixing hole are fixedly connected by bolts.

[0019] Furthermore, the battery holder includes a hollow structure.

[0020] Furthermore, at least one side of the welding bracket also includes a fourth positioning hole spaced apart. After the battery module and the battery bracket are placed in the welding bracket, at least one side of the battery bracket falls into the fourth positioning hole.

[0021] Preferably, the size of the first positioning hole is larger than the welding surface; the battery bracket further includes a boss structure, and the first positioning hole is located on the boss.

[0022] Furthermore, at least one side of the welding bracket also includes a buffer pad, which is disposed between the inner wall of the welding bracket and the battery cell.

[0023] Preferably, the contact surfaces between the battery module and the housing are further provided with potting compound.

[0024] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0025] First, this invention welds the busbars between multiple battery cells using welding. In traditional single-sided welding, due to assembly tolerance issues, the welding surfaces between the battery cells and the support often become uneven, easily leading to incomplete welds, overheating, or even safety accidents. This invention, through a precisely designed welding plane and relying on the weight of the battery cells to make the welding surfaces flush, ensures reliable welding quality, avoids incomplete welds, and improves the safety and stability of the battery pack.

[0026] Secondly, by using a single battery bracket for fixing, this invention allows for flexible combination based on different requirements of the series and parallel connection of battery cells, avoiding the high cost and long lead time issues of traditional solutions that require the customization of complex plastic brackets. The modular design enables the battery pack to be quickly customized according to needs, greatly shortening the development and production cycle. Furthermore, the cell bonding method of this invention allows for the flexible assembly of different numbers and types of cells to meet the needs of different energy storage battery packs (such as 1P48S, 1P56S, 2P24S, etc.), significantly improving the flexibility and adaptability of the energy storage battery pack and enabling rapid adjustment of battery module specifications according to different application scenarios.

[0027] Third, by setting a first positioning pin and a second positioning hole between the welding platform and the battery bracket, this utility model can ensure that the battery module is positioned accurately and stably during the welding process, effectively avoiding the problem of battery module displacement or misalignment during welding, thereby improving the welding accuracy and consistency, ensuring the welding quality of the busbar and the battery cell, reducing welding defects caused by inaccurate positioning, and improving the overall safety and reliability of the battery pack. In addition, it makes the installation and disassembly of the battery module, battery bracket and welding platform bracket easier, which is conducive to mass production and modular assembly in the production process, further improving production efficiency and reducing costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the potted energy storage battery pack of this utility model;

[0030] Figure 2 This is a schematic diagram of the battery module of this utility model;

[0031] Figure 3 This is a front view of the battery module of this utility model;

[0032] Figure 4 This is an assembly diagram of the battery cell and welding bracket of this utility model;

[0033] Figure 5 This is a schematic diagram of the structure of the welding bracket of this utility model;

[0034] Figure 6 This is a schematic diagram of the first structure of the battery holder of this utility model;

[0035] Figure 7 This is a schematic diagram of the second structure of the battery holder of this utility model;

[0036] Figure 8 This is a schematic diagram of the structure of the box body of this utility model.

[0037] Explanation of reference numerals in the attached figures

[0038] 1. Housing; 11. Positive terminal; 12. Negative terminal; 13. Handle; 14. Vent; 15. Second fixing hole; 16. Third positioning hole; 2. Battery module; 21. Battery cell; 211. Welding surface; 212. Fixing surface; 22. Busbar; 31. Boss; 311. Second positioning hole; 32. Hollow structure; 33. First fixing hole; 34. Second positioning pin; 4. Welding bracket; 41. First positioning hole; 42. Welding platform; 43. First positioning pin; 44. Fourth positioning hole; 45. Buffer pad. Detailed Implementation

[0039] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0040] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. This utility model can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] Example 1:

[0042] In existing technologies, energy storage battery packs typically use two plastic brackets to fix cylindrical battery cells 21, and busbars 22 are connected to the battery cells 21 using single-sided or double-sided welding. Single-sided welding offers higher production efficiency compared to double-sided welding. However, when the series-parallel connection of the battery cells 21 in the energy storage battery pack changes, the existing plastic brackets need to be redesigned and customized. Furthermore, during the assembly process of the battery cells 21 and the plastic brackets, assembly tolerances often lead to inconsistent heights of the welding surfaces 211 of adjacent battery cells 21. Under these circumstances, how to use only one type of battery pack to improve its compatibility, production efficiency, and safety performance, while reducing development cycle and cost, has become an urgent problem to be solved in the industry. This embodiment provides a potted energy storage battery pack suitable for industrial and commercial energy storage systems.

[0043] like Figure 1 - Figure 8As shown, the battery pack includes a housing 1, a battery module 2, a battery bracket, and a welding bracket 4. The housing 1 also includes a positive terminal 11, a negative terminal 12, a handle 13, and a vent 14 to facilitate heat dissipation of the battery cell 21 and make the battery pack easy to carry. The battery bracket includes a second positioning hole 311, and a first positioning pin 43 is provided between the first positioning holes 41 of the welding bracket 4. After the battery cell 21 is placed in the first positioning hole 41, the first positioning pin 43 is placed in the second positioning hole 311 to fix the welding bracket 4. The battery bracket includes a second positioning pin 34, and the second positioning pin 34 and the second positioning hole 311 are provided on opposite sides of the battery bracket. The housing 1 is provided with a third positioning hole 16, and the battery bracket and the housing 1 are connected by the second positioning pin 34 and the second positioning hole 311. The battery bracket includes a first fixing hole 33, which is located on the same side as the second fixing pin 34. The housing 1 has a second fixing hole 15. After the second fixing pin 34 is connected to the third fixing hole 16, the second fixing hole 15 and the first fixing hole 33 are fixedly connected by bolts. The battery bracket includes a hollow structure 32. At least one side of the welding bracket 4 includes a fourth positioning hole 44 spaced apart. After the battery module 2 and the battery bracket are placed in the welding bracket 4, at least one side of the battery bracket falls into the fourth positioning hole 44. At least one side of the welding bracket 4 includes a buffer pad 45, which is located between the inner wall of the welding bracket 4 and the battery cell 21. The contact surface between the battery module 2 and the housing 1 is provided with potting compound.

[0044] In a preferred embodiment, see again Figure 2 The battery module 2 consists of multiple cylindrical battery cells 21 and a busbar 22. Each battery cell 21 has a welding surface 211 at its bottom and a fixing surface 212 at its top. The welding surface 211 contacts the welding platform 42 to control the height of the multiple battery cells 21, while the fixing surface 212 secures the battery cells 21 to the housing 1. The welding surfaces 211 of each battery cell 21 are connected to the welding surfaces 211 of adjacent battery cells 21 via the busbar 22, forming an electrical connection for the battery module 2. Multiple battery modules 2 are combined in series and parallel to meet the voltage and capacity requirements of the energy storage battery pack.

[0045] In a preferred embodiment, see again Figure 6 and Figure 7 The battery bracket consists of a frame structure with multiple grooved surfaces. Each grooved surface is used to precisely position a battery cell 21. The battery cell 21 is connected to the busbar 22 via a welding surface 211, ensuring that the battery cell 21 is fixed in position within the bracket. The grooved surfaces in the battery bracket are arc-shaped to accommodate the shape of the cylindrical battery cell 21, making the battery cell 21 more stable during installation. The battery bracket also includes a second positioning hole 311 for engaging with the positioning pin of the welding bracket 4 to ensure accurate positioning of the battery cell 21.

[0046] In a preferred embodiment, see again Figure 5 The welding bracket 4 adopts a groove-shaped structure with at least one first positioning hole 41 at its bottom. The welding platform 42 and the inner wall of the first positioning hole 41 are stepped. The welding platform 42 provides a stable reference for welding the battery cell 21, ensuring the flatness and consistency of the welding surface 211 of the busbar 22 and the battery cell 21. The stepped structure of the welding platform 42 and the first positioning hole 41 ensures that the welding surface 211 of the battery cell 21 is tightly attached to the welding platform 42, thereby avoiding the problem of incomplete welding caused by height difference.

[0047] In a preferred embodiment, after the battery module 2 is placed in the welding bracket 4, the welding surface 211 of the battery cell 21 contacts the welding platform 42, the second positioning hole 311 of the battery bracket contacts and is fixed with the first positioning pin 43 on the welding bracket 4, and then the busbar 22 is fixed on the welding surface 211 of the battery cell 21 by welding. Due to the stepped design of the welding platform 42, the contact surface between the welding surface 211 of the battery cell 21 and the welding platform 42 remains flat, avoiding height inconsistencies caused by assembly tolerances.

[0048] In a preferred embodiment, see again Figure 7 and Figure 8 The battery module 2 is connected to the third positioning hole 16 on the housing 1 via the second positioning pin 34, ensuring a stable connection between the battery module 2 and the housing 1. To further enhance stability, the battery bracket also includes a first fixing hole 33, and the housing 1 is provided with a second fixing hole 15. The first fixing hole 33 and the second fixing hole 15 are connected by bolts, thereby firmly fixing the battery module 2 inside the housing 1. The bolt connection design not only ensures the safety of the battery module 2, but also facilitates subsequent disassembly and maintenance.

[0049] In a preferred embodiment, see again Figure 1 A potting compound is applied between the contact surfaces of the battery module 2 and the housing 1. The potting compound has good sealing properties, which can effectively prevent external moisture, dust and impurities from entering the battery module 2, thereby improving the safety and reliability of the battery pack.

[0050] In a preferred embodiment, see again Figure 6 and Figure 7 The battery bracket features a hollow design, which effectively reduces its weight while improving heat dissipation. Since the energy storage battery pack generates heat during prolonged operation, the hollow structure 32 helps dissipate this heat, keeping the temperature of the battery module 2 within a safe range.

[0051] Example 2:

[0052] In another embodiment, such as Figure 4 and Figure 5As shown, an improved welding bracket 4 design is adopted to further improve welding quality and battery pack safety. In this embodiment, the welding bracket 4 has fourth positioning holes 44 spaced apart on both sides. After the battery bracket falls into the fourth positioning holes 44, it can be further guided to fall into the correct position, avoiding welding defects caused by uneven force or uneven welding platform 42 during the welding process of the battery cell 21.

[0053] In a preferred embodiment, the inner wall of the welding bracket 4 is also provided with a buffer pad 45, which can effectively alleviate the impact force on the battery cell 21 during installation, thereby preventing damage to the battery cell 21 or poor welding, and improving the assembly accuracy and safety of the battery pack.

[0054] In a preferred embodiment, see again Figure 5 and Figure 6 The size of the first positioning hole 41 is larger than that of the welding surface 211, making it easier for the battery cell 21 to be positioned. The battery bracket also includes a boss 31 structure, and the first positioning hole 41 is located on the boss 31. Since the size of the first positioning hole 41 is large, the area between the multiple first positioning holes 41 is small. Therefore, the contact area between the battery bracket and the multiple first positioning holes 41 should also be reduced, so that the first positioning pin 43 can be more easily connected to the second positioning hole 311.

[0055] Through the detailed description of the above embodiments, the encapsulated energy storage battery pack provided by this utility model has been significantly optimized in terms of cell 21 fixing, welding quality, sealing performance, and production efficiency. The battery pack has a stable structure, reliable welding quality, and good heat dissipation performance and adaptability, meeting the diverse needs of different cell 21 series-parallel connections and energy storage battery packs. It is suitable for energy storage applications in industrial, commercial, and other fields.

[0056] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the descriptions of the embodiments described later are relatively simple, and relevant parts can be referred to the descriptions of the foregoing embodiments.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A potted energy storage battery pack, characterized in that, include: The housing has a positive terminal and a negative terminal; A battery module comprising multiple battery cells and a busbar, wherein each battery cell includes a bottom welding surface and a top fixing surface, the multiple welding surfaces are electrically connected to each other via the busbar, and the busbar is connected to the positive terminal and the negative terminal; A battery holder, the battery holder including at least two recessed surfaces, with adjacent battery cells connected to the recessed surfaces between the battery holders; A welding bracket is provided, which has a groove-shaped structure. The bottom of the welding bracket includes at least one first positioning hole, which penetrates the welding bracket. A welding platform is provided in the first positioning hole, and the welding platform is stepped with the first positioning hole. The battery module is placed in the welding bracket, the battery cell is placed in the first positioning hole, and the welding surface is in close contact with the welding platform to weld the busbar to the welding surface.

2. The potted energy storage battery pack according to claim 1, characterized in that, The battery cell is cylindrical, and the groove is arc-shaped.

3. The potted energy storage battery pack according to claim 1, characterized in that, The battery bracket also includes a second positioning hole, and a first positioning pin is provided between the first positioning holes of the welding bracket; after the battery cell is placed in the first positioning hole, the first positioning pin is placed in the second positioning hole to fix the welding bracket.

4. The potted energy storage battery pack according to claim 3, characterized in that, The battery bracket also includes a second positioning pin, and the second positioning pin and the second positioning hole are located on opposite sides of the battery bracket; the housing is provided with a third positioning hole, and the battery bracket is connected to the housing through the second positioning pin and the third positioning hole.

5. The potted energy storage battery pack according to claim 4, characterized in that, The battery bracket also includes a first fixing hole, which is located on the same side of the battery bracket as the second positioning pin; the housing is provided with a second fixing hole, and after the second positioning pin is connected to the third positioning hole, the second fixing hole and the first fixing hole are fixedly connected by bolts.

6. The potted energy storage battery pack according to claim 1, characterized in that, The battery holder includes a hollow structure.

7. The potted energy storage battery pack according to claim 1, characterized in that, The welding bracket further includes at least one side of a fourth positioning hole spaced apart. After the battery module and the battery bracket are placed in the welding bracket, at least one side of the battery bracket falls into the fourth positioning hole.

8. The potted energy storage battery pack according to claim 7, characterized in that, The first positioning hole is larger than the welding surface; the battery bracket also includes a boss structure, and the first positioning hole is located on the boss.

9. The potted energy storage battery pack according to claim 8, characterized in that, At least one side of the welding bracket further includes a buffer pad, which is disposed between the inner wall of the welding bracket and the battery cell.

10. The potted energy storage battery pack according to any one of claims 1-9, characterized in that, The contact surfaces between the battery module and the housing are also provided with potting compound.

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