Cylindrical battery module

Abstract

The utility model provides a kind of cylindrical battery module, belong to mechanical technical field.The cylindrical battery module includes shell and cover plate assembly, the shell is cylindrical and its lower end is open, the shell is metal material, the cover plate assembly is connected at shell upper end place and cover plate assembly is used to be electrically connected with the negative pole of battery, the lower end in the shell is used to be electrically connected with the positive pole of battery, the shell lower end place has the connecting assembly for connecting explosion-proof valve.The cylindrical battery module is high in stability.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, and more specifically to cylindrical battery modules. Background Technology

[0002] In existing battery covers, the explosion-proof valve is usually installed on the cover. After the explosion-proof valve is welded to the cover, the cover is then welded to the aluminum shell.

[0003] Because there is a risk of welding defects after welding the explosion-proof valve, such as weld holes or weld protrusions, these defects can lead to air leakage in the entire battery cover. Therefore, unstable welding of the explosion-proof valve can result in the scrapping of the entire product and increased production costs.

[0004] Moreover, conventional battery cells have an injection hole on the cover plate. After the cover plate is welded, electrolyte is injected through the injection hole. After the injection is completed, a sealing aluminum cap is used to seal it.

[0005] If an abnormality occurs at the battery cell end in the existing battery cover, the explosion-proof valve will open and the electrolyte will overflow, which may cause the cover insulation to fail, short circuit, or other adverse conditions, leading to fire, corrosion, etc. Therefore, its stability is relatively poor. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a cylindrical battery module that is highly stable and has a compact structure.

[0007] To achieve the above objectives, this utility model can be implemented through the following technical solutions:

[0008] A cylindrical battery module includes a housing and a cover assembly. The housing is cylindrical and has an opening at its lower end. The housing is made of metal. The cover assembly is connected to the upper end of the housing and is used for electrical connection with the negative electrode of the battery. The lower end of the housing is used for electrical connection with the positive electrode of the battery. The lower end of the housing has a connecting assembly for connecting an explosion-proof valve.

[0009] In the aforementioned cylindrical battery module, the connecting assembly includes an inner connecting plate, an outer connecting plate, and a connecting hole penetrating the center of the lower end of the housing. The inner connecting plate is fixed inside the housing, and the outer connecting plate is fixed outside the housing. The connecting hole is used to place an explosion-proof valve, and the explosion-proof valve can be limited between the inner connecting plate and the outer connecting plate.

[0010] In the cylindrical battery module described above, the inner connecting plate is in contact with and fixed to the bottom surface inside the housing.

[0011] In the above-mentioned cylindrical battery module, the lower end of the connecting hole has an annular recessed connecting seat. The outer connecting plate matches the connecting seat, and the edge of the outer connecting plate is embedded in the connecting seat and the two are welded and fixed. The inner connecting plate has a through hole, the inner diameter of which is smaller than the inner diameter of the connecting hole, and the through hole and the connecting hole are coaxially aligned.

[0012] In the cylindrical battery module described above, the outer connecting plate has a deformable part at its center.

[0013] In the aforementioned cylindrical battery module, the outer side of the deformable part protrudes spherically from the outside of the outer connecting plate, while the inner side of the deformable part is spherically recessed into the inside of the outer connecting plate.

[0014] In the cylindrical battery module described above, the outer connecting plate has an annular recessed deformation groove, which is located at the edge of the deformed part.

[0015] In the aforementioned cylindrical battery module, the outer connecting plate has several annular protruding connecting edges, which are embedded in the connecting seat.

[0016] In the aforementioned cylindrical battery module, several connections are arranged along the same center and distributed from the inside out along the edge of the outer connection plate.

[0017] In the aforementioned cylindrical battery module, the cover plate assembly includes an insulating sleeve and metal poles and a plate. The plate is fixed to the upper end of the housing and seals the upper end of the housing. The poles are fixed to the center of the plate, and the insulating sleeve is located between the poles and the plate.

[0018] Compared to existing technologies, the explosion-proof valve in this cylindrical battery module is located on the casing. The casing is single-pass, with an opening at the bottom of the positive electrode. The explosion-proof valve is welded at the bottom opening. The casing is positively charged. The explosion-proof valve and the cover plate are located at opposite ends of the cell, achieving thermoelectric separation. Once the valve is opened, the overflowing electrolyte moves away from the cover plate, minimizing or eliminating its impact on the cover plate and ensuring cell safety. Therefore, its stability and safety are both relatively high.

[0019] Meanwhile, the explosion-proof valve is integrated with the housing. The explosion-proof valve is welded to the upper part of the cover plate assembly. After the cell is filled with electrolyte, the explosion-proof valve is welded to the bottom of the housing. This serves both as an explosion-proof valve and as a sealing weld after electrolyte filling, further optimizing the entire cell component process and reducing manufacturing costs. Attached Figure Description

[0020] Figure 1 This is a 3D structural diagram of the cylindrical battery module.

[0021] Figure 2 This is a cross-sectional view of the cylindrical battery module.

[0022] Figure 3 This is a partial cross-sectional view of the lower end of the casing in this cylindrical battery module.

[0023] Figure 4 This is a schematic diagram of the connecting components in this cylindrical battery module.

[0024] Figure 5 This is a structural schematic diagram of the cover plate assembly in this cylindrical battery module.

[0025] In the picture:

[0026] 1. Housing; 1a. Connecting hole; 1a1. Connecting seat; 2. Inner connecting plate; 2a. Through hole; 3. Outer connecting plate; 3a. Deformation part; 3b. Deformation groove; 3c. Connecting edge; 4. Insulating sleeve; 5. Pole post; 6. Plate body. Detailed Implementation

[0027] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0028] like Figure 1-5 As shown, this cylindrical battery module includes a housing 1 and a cover plate assembly. The housing 1 is cylindrical and has an opening at its lower end. The housing 1 is made of metal. The cover plate assembly is connected to the upper end of the housing 1 and is used for electrical connection with the negative terminal of the battery. The lower end of the housing 1 is used for electrical connection with the positive terminal of the battery. The lower end of the housing 1 has a connecting assembly for connecting an explosion-proof valve.

[0029] As can be seen, since the explosion-proof valve is located at the lower end of housing 1, while the cover plate assembly is located at the upper end of housing 1, when the explosion-proof valve is opened, the overflowing electrolyte is kept away from the cover plate assembly, which can effectively prevent the overflowing electrolyte from affecting the cover plate assembly.

[0030] Of course, the explosion-proof valve can be stably connected to the lower end of the housing 1 by means of the connecting components.

[0031] The cover plate assembly serves as the negative electrode of the entire battery module, while the lower end of the metal casing 1 serves as the positive electrode of the entire battery module. After the battery is installed in the casing, it can conduct electricity stably.

[0032] The connecting assembly includes an inner connecting plate 2, an outer connecting plate 3, and a connecting hole 1a penetrating the center of the lower end of the housing 1. The inner connecting plate 2 is fixed inside the housing 1, and the outer connecting plate 3 is fixed outside the housing 1. The connecting hole 1a is used to place an explosion-proof valve, and the explosion-proof valve can be limited between the inner connecting plate 2 and the outer connecting plate 3.

[0033] The explosion-proof valve can be stably positioned at the connection hole 1a at the lower end of the housing 1 by means of the outer connecting plate 3 and the inner connecting plate 2.

[0034] The inner connecting plate 2 is in contact with and fixed to the bottom surface inside the housing 1.

[0035] This structure allows the inner connecting plate 2 to be stably fixed together with the shell 1.

[0036] The lower end of the connecting hole 1a has an annular recessed connecting seat 1a1. The outer connecting plate 3 matches the connecting seat 1a1. The edge of the outer connecting plate 3 is embedded in the connecting seat 1a1 and the two are welded and fixed. The inner connecting plate 2 has a through hole 2a. The inner diameter of the through hole 2a is smaller than the inner diameter of the connecting hole 1a, and the through hole 2a and the connecting hole 1a are arranged on the same axis.

[0037] The outer connecting plate 3 and the connecting seat 1a1 at the lower end of the housing 1 can be matched to make the outer connecting plate 3 and the housing 1 stably connected.

[0038] Meanwhile, since the size of the through hole 2a is smaller than that of the connecting hole 1a, the inner edge of the inner connecting plate 2 can stably support and position the upper end of the explosion-proof valve. The outer connecting plate 3 is used to stably support and position the lower end of the explosion-proof valve.

[0039] The outer connecting plate 3 has a deformable part 3a at its center.

[0040] When the explosion-proof valve is opened, the deformed part 3a can be stably destroyed, thereby improving the safety of the entire battery module.

[0041] The outer side of the deformable part 3a is spherically protruding from the outside of the outer connecting plate 3, and the inner side of the deformable part 3a is spherically recessed into the inside of the outer connecting plate 3.

[0042] This structure allows for sufficient space between the outer connecting plate 3 and the inner connecting plate 2 for the installation of the explosion-proof valve.

[0043] The outer connecting plate 3 has an annular recessed deformation groove 3b, which is located at the edge of the deformable part 3a.

[0044] Because the outer connecting plate 3 at the deformation groove 3b is relatively thin, the deformation part 3a can be stably destroyed after the explosion-proof valve is opened.

[0045] The outer connecting plate 3 has several annular protruding connecting edges 3c at its edge, and the connecting edges 3c are embedded in the connecting seat 1a1.

[0046] The arrangement of multiple connecting lines along 3c improves the stability of the connection between the outer connecting plate 3 and the housing 1. Moreover, this structure allows the outer connecting plate 3 to stably detach from the housing 1 after the explosion-proof valve is opened.

[0047] Several connections are arranged along the same center of 3c and distributed from the inside to the outside at the edge of the outer connection plate 3.

[0048] The arrangement of multiple connecting lines along 3c can effectively improve the connection stability between the outer connecting plate 3 and the housing 1.

[0049] The cover plate assembly includes an insulating sleeve 4, a metal pole post 5, and a plate 6. The plate 6 is fixed to the upper end of the housing 1 and seals the upper end of the housing 1. The pole post 5 is fixed to the center of the plate 6, and the insulating sleeve 4 is located between the pole post 5 and the plate 6.

[0050] The pole post 5 is stably and fixedly connected to the plate body 6, and the plate body 6 is welded and fixed to the housing 1. Since the insulating sleeve 4 is located between the pole post 5 and the plate body 6, a stable insulation is formed between the pole post 5 and the plate body 6.

[0051] In this cylindrical battery module, the explosion-proof valve is located on the casing. The casing is single-pass, with an opening at the bottom of the positive terminal. The explosion-proof valve is welded at the bottom opening. The casing is positively charged. The explosion-proof valve and the cover plate are located at opposite ends of the cell, achieving thermoelectric separation. Once the valve is opened, the overflowing electrolyte moves away from the cover plate end, minimizing or eliminating its impact on the cover plate and ensuring cell safety. Therefore, its stability and safety are both relatively high.

[0052] Meanwhile, the explosion-proof valve is integrated with the housing. The explosion-proof valve is welded to the upper part of the cover plate assembly. After the cell is filled with electrolyte, the explosion-proof valve is welded to the bottom of the housing. This serves both as an explosion-proof valve and as a sealing weld after electrolyte filling, further optimizing the entire cell component process and reducing manufacturing costs.

[0053] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0054] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A cylindrical battery module, comprising a housing and a cover assembly, wherein the housing is cylindrical and open at its lower end, characterized in that, The housing is made of metal. The cover assembly is connected to the upper end of the housing and is used for electrical connection with the negative terminal of the battery. The lower end of the housing is used for electrical connection with the positive terminal of the battery. The lower end of the housing has a connecting assembly for connecting an explosion-proof valve.

2. The cylindrical battery module according to claim 1, characterized in that, The connecting assembly includes an inner connecting plate, an outer connecting plate, and a connecting hole that penetrates the center of the lower end of the housing. The inner connecting plate is fixed inside the housing, and the outer connecting plate is fixed outside the housing. The connecting hole is used to place an explosion-proof valve, and the explosion-proof valve can be limited between the inner connecting plate and the outer connecting plate.

3. The cylindrical battery module according to claim 2, characterized in that, The inner connecting plate is in contact with and fixed to the bottom surface inside the housing.

4. The cylindrical battery module according to claim 3, characterized in that, The lower end of the connecting hole has an annular recessed connecting seat. The outer connecting plate matches the connecting seat, and the edge of the outer connecting plate is embedded in the connecting seat and the two are welded and fixed. The inner connecting plate has a through hole. The inner diameter of the through hole is smaller than the inner diameter of the connecting hole, and the through hole and the connecting hole are coaxially aligned.

5. The cylindrical battery module according to claim 2, 3, or 4, characterized in that, The outer connecting plate has a deformable part at its center.

6. The cylindrical battery module according to claim 5, characterized in that, The outer side of the deformable part protrudes spherically from the outside of the outer connecting plate, while the inner side of the deformable part is spherically recessed into the inside of the outer connecting plate.

7. The cylindrical battery module according to claim 6, characterized in that, The outer connecting plate has an annular recessed deformation groove located at the edge of the deformable part.

8. The cylindrical battery module according to claim 7, characterized in that, The outer connecting plate has several annular protruding connecting edges at its edge, and these connecting edges are embedded in the connecting seat.

9. The cylindrical battery module according to claim 8, characterized in that, Several connections are arranged along the same center and distributed from the inside to the outside along the edge of the outer connection plate.

10. The cylindrical battery module according to claim 9, characterized in that, The cover plate assembly includes an insulating sleeve and a metal pole and a plate. The plate is fixed to the upper end of the housing and seals the upper end of the housing. The pole is fixed to the center of the plate, and the insulating sleeve is located between the pole and the plate.

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