Battery housing and battery cell

Abstract

The utility model discloses a battery shell and battery monomer, battery shell includes casing and apron. The casing is metal spare, and the at least one side of casing has the opening, and the apron is metal spare and covers and is located the opening, and the apron is welded with casing connection, and the melting point of apron is different with the melting point of casing. According to the battery shell of the utility model, through making the apron with casing adopt the material quality of different melting point, like this, when the casing is welded with the apron connection, utilize the melting point difference of both, make the sealing of welding better.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing and a battery cell. Background Technology

[0002] In related technologies, the battery casing is used to house and protect electrode components. The battery casing is typically assembled from a housing and a cover plate, with the cover plate welded to the opening of the housing. The sealing performance of the welded connection between the cover plate and the housing affects the overall sealing performance of the battery casing, thus impacting the performance of the electrode components located inside the battery casing. Poor weld sealing between the cover plate and the housing allows external dust and liquids to enter the battery casing through welding defects, affecting the performance and lifespan of the electrode components. Therefore, how to further improve the weld sealing performance between the cover plate and the housing is an important research topic in this field. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery casing with a cover plate that has better weld sealing to the casing, which is beneficial to improving the overall performance of the battery.

[0004] This utility model also proposes a battery cell having the above-mentioned battery casing.

[0005] A battery casing according to a first aspect of the present invention includes: a housing, the housing being a metal part, the housing having an opening on at least one side; and a cover plate, the cover plate being a metal part and covering the opening, the cover plate being welded to the housing, the cover plate having a different melting point than the housing.

[0006] According to the battery casing of this utility model embodiment, by using materials with different melting points for the cover plate and the casing, the difference in melting points between the two materials is utilized when the casing and the cover plate are welded together, resulting in better sealing of the weld.

[0007] In some embodiments of this utility model, the absolute value of the difference in melting points between the shell and the cover plate is 100℃~300℃.

[0008] In some embodiments of this invention, the melting point of the shell is greater than the melting point of the cover plate.

[0009] In some embodiments of this utility model, the cover plate is made of stainless steel, the housing is made of titanium or titanium alloy; and / or, the surface of the cover plate is provided with a nickel plating layer.

[0010] In some embodiments of this utility model, the wall thickness of the shell is 0.05mm to 0.20mm; and / or, the wall thickness of the cover plate is 0.075mm to 0.15mm.

[0011] In some embodiments of this utility model, the housing is provided with a liquid injection hole, and a sealing pin is provided at the liquid injection hole to block the liquid injection hole; wherein, the inner circumferential surface of the liquid injection hole is a first sealing surface, and at least a portion of the outer circumferential surface of the sealing pin constitutes a second sealing surface, and the second sealing surface and the first sealing surface are both arc-shaped surfaces and are sealed together.

[0012] In some embodiments of this utility model, the sealing pin includes a plugging part and a flange part. The plugging part is accommodated in the injection hole and has a second sealing surface. The flange part is connected to the outer peripheral side of the plugging part and is located on the outside of the housing. The surface of the housing facing the flange part is a third sealing surface, and the surface of the flange part facing the housing is a fourth sealing surface. The third sealing surface and the fourth sealing surface are both planar and sealingly fitted. The third sealing surface is smoothly connected to the first sealing surface, and the fourth sealing surface is smoothly connected to the second sealing surface.

[0013] In some embodiments of this utility model, the thickness of the flange portion is 0.075mm to 0.20mm; and / or, a groove is formed on the outer side of the sealing portion.

[0014] In some embodiments of this utility model, the housing is provided with a liquid injection hole, and a sealing nail is provided at the liquid injection hole to block the liquid injection hole; wherein, the sealing nail is a metal part and is welded to the housing, and the melting point of the sealing nail is different from the melting point of the housing.

[0015] A battery cell according to a second aspect of the present invention includes: a battery casing according to the first aspect of the present invention; and an electrode assembly disposed within the battery casing.

[0016] According to the battery cell of the present invention, by setting the above-mentioned battery casing, the welding seal between the cover plate and the casing of the battery casing is better, which is beneficial to improving the overall performance of the battery.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a perspective view of a battery casing according to some embodiments of the present invention; Figure 2 yes Figure 1 A schematic diagram showing the separation of the cover plate from the casing of the battery; Figure 3 yes Figure 1 A cross-sectional view of the battery casing; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 yes Figure 1 A cross-sectional view of the battery casing, showing the sealing pins separated from the casing; Figure 6 yes Figure 5 Enlarged view of point B in the middle; Figure 7 This is a schematic diagram of a battery cell according to some embodiments of the present invention; Figure 8 This is a schematic diagram of a battery device according to some embodiments of the present invention; Figure 9 This is a schematic diagram of an electrical device according to some embodiments of the present invention.

[0019] Figure label: 100. Battery casing; 10. Housing; 11. Opening; 12. Injection port; 13. First sealing surface; 14. Third sealing surface; 20. Cover plate; 30. Sealing pin; 31. Sealing part; 32. Flange part; 33. Second sealing surface; 34. Fourth sealing surface; 35. Groove; 200. Battery cell; 40. Electrode assembly; 300. Battery assembly; 50. Housing; 500. Electrical appliances. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] The following is for reference. Figures 1-6 Description of a battery casing 100 according to an embodiment of the present utility model.

[0022] Reference Figure 1 and Figure 2According to a first aspect embodiment of the present invention, a battery casing 100 includes a housing 10 and a cover plate 20. The housing 10 is a metal component, and at least one side of the housing 10 has an opening 11. The cover plate 20 is also a metal component and is disposed over the opening 11. Thus, by sealing the opening 11 of the housing 10 with the cover plate 20, a sealed receiving space is formed inside the battery casing 100, which is used to receive the electrode assembly 40.

[0023] The cover plate 20 is welded to the housing 10, for example, by laser welding. The melting point of the cover plate 20 is different from that of the housing 10. Because of this difference in melting points, the lower melting point material (e.g., the cover plate 20) melts preferentially during welding, filling the microscopic gaps of the higher melting point material (e.g., the housing 10) through capillary action, forming a dense metallurgical bonding layer. This structure reduces porosity and incomplete penetration defects, improves sealing, and results in a better seal between the cover plate 20 and the housing 10.

[0024] According to the embodiment of the present invention, the battery casing 100 uses a cover plate 20 and a casing 10 made of materials with different melting points. This allows for better sealing of the weld when the casing 10 and the cover plate 20 are welded together, by utilizing the difference in their melting points.

[0025] In some embodiments of this utility model, the absolute value of the melting point difference between the shell 10 and the cover plate 20 is 100℃ to 300℃. For example, the absolute values ​​of the melting point difference between the shell 10 and the cover plate 20 are 100℃, 120℃, 140℃, 160℃, 180℃, 200℃, 220℃, 240℃, 260℃, 280℃, 300℃, etc. When the melting point of the shell 10 is greater than the melting point of the cover plate 20, the melting point difference between the shell 10 and the cover plate 20 is a positive value; when the melting point of the shell 10 is less than the melting point of the cover plate 20, the melting point difference between the shell 10 and the cover plate 20 is a negative value.

[0026] By ensuring that the absolute value of the melting point difference between the shell 10 and the cover plate 20 is between 100℃ and 300℃, the melting point difference between the shell 10 and the cover plate 20 can be kept within a suitable range. By ensuring that the absolute value of the melting point difference between the shell 10 and the cover plate 20 is not less than 100℃, the low-melting-point material (e.g., the cover plate 20) can be melted preferentially during welding to fully fill the microscopic gaps of the high-melting-point material (e.g., the shell 10). By ensuring that the absolute value of the melting point difference between the shell 10 and the cover plate 20 is not greater than 300℃, the problems of low-melting-point material loss, alloy element burn-off, or evaporation can be better avoided, thereby improving the welding effect and welding sealing performance.

[0027] In some embodiments of this invention, the melting point of the shell 10 is greater than that of the cover plate 20. By making the melting point of the shell 10 greater than that of the cover plate 20, the shell 10 can have better high-temperature resistance and can better maintain structural strength and stability in high-temperature environments.

[0028] For example, when the melting point of the shell 10 is greater than that of the cover plate 20, when welding the shell 10 and the cover plate 20 together, the cover plate 20 can be positioned on the upper side of the shell 10, allowing the cover plate 20 with the lower melting point to melt first. After the welded part of the cover plate 20 melts, it fills the micro-gap of the shell 10 through capillary action, forming a dense metallurgical bonding layer. This structure can reduce porosity and incomplete penetration defects, improve sealing performance, and make the weld between the cover plate 20 and the shell 10 more airtight.

[0029] In some other embodiments of this invention, the melting point of the cover plate 20 is greater than that of the housing 10. When welding the housing 10 to the cover plate 20, the housing 10 can be positioned above the cover plate 20, allowing the housing 10, with its lower melting point, to melt first. After the welded portion of the housing 10 melts, it fills the microscopic gaps in the cover plate 20 through capillary action, forming a dense metallurgical bonding layer. This structure reduces porosity and incomplete penetration defects, improves sealing, and results in a better seal between the cover plate 20 and the housing 10.

[0030] In some embodiments of this utility model, the housing 10 is made of titanium or titanium alloy. Compared to metals such as aluminum alloy and stainless steel, titanium or titanium alloy has the advantages of being lightweight, having high specific strength, and good thermal conductivity. Titanium or titanium alloy also has good corrosion resistance. Due to the lightweight and high specific strength of the housing 10, the energy density of the battery cell 200 using the housing 100 can be higher, and it can more effectively resist external impacts and compression, preventing internal short circuits in the battery cell 200, thereby reducing the risk of thermal runaway. Because the housing 10 has good thermal conductivity, the heat generated by the electrode assembly 40 housed in the battery housing 100 can be conducted away from the battery more quickly through the housing 10, preventing heat accumulation and helping to maintain the battery operating within an optimal temperature range, which is beneficial for improving the battery's fast-charging performance and lifespan.

[0031] The term "titanium metal component" for the housing 10 refers to the housing 10 being made of pure titanium, where pure titanium means a titanium content of 99% or higher. Using titanium metal for the housing 10 also offers the following advantages: titanium metal has better machinability, making it easier to process and shape the housing 10, for example, simplifying the stretching and stamping processes; and titanium metal has superior corrosion resistance compared to titanium alloys.

[0032] Titanium metal has a melting point of 1668℃, while titanium alloys have a melting point of 1600℃~1700℃.

[0033] In some embodiments of this utility model, the cover plate 20 is made of stainless steel. By making the cover plate 20 a stainless steel component, the cover plate 20 has a different melting point from the shell 10, while also improving the structural strength, corrosion resistance, and thermal conductivity of the cover plate 20. The melting point of stainless steel is 1370℃~1530℃.

[0034] In some embodiments of this utility model, the surface of the cover plate 20 is provided with a nickel plating layer. By providing a nickel plating layer on the surface of the cover plate 20, the nickel plating layer has good corrosion resistance and wear resistance, thereby improving the corrosion resistance and wear resistance of the cover plate 20. The melting point of nickel is 1455℃.

[0035] In some embodiments of this utility model, the cover plate 20 is made of stainless steel, and the surface of the cover plate 20 is provided with a nickel plating layer. By making the cover plate 20 a stainless steel part and providing a nickel plating layer on the surface of the cover plate 20, the cover plate 20 and the housing 10 have different melting points, while the cover plate 20 has better structural strength, corrosion resistance and thermal conductivity.

[0036] In some embodiments of this utility model, the housing 10 is made of aluminum alloy, and the surface of the cover plate 20 is provided with a galvanized layer. This makes the housing 10 lighter, and the galvanized layer on the cover plate 20 provides good corrosion resistance. The melting point of aluminum alloy is 660℃, and the melting point of zinc is 420℃.

[0037] In some embodiments of this utility model, the housing 10 is made of titanium and the cover plate 20 is made of stainless steel; or, the housing 10 is made of titanium alloy and the cover plate 20 is made of stainless steel; or, the housing 10 is made of titanium and the cover plate 20 has a nickel-plated layer on its surface; or, the housing 10 is made of titanium alloy and the cover plate 20 has a nickel-plated layer on its surface; or, the housing 10 is made of aluminum alloy and the cover plate 20 has a zinc-plated layer on its surface. In this way, the housing 10 and the cover plate 20 have different melting points, and when the housing 10 and the cover plate 20 are welded, the difference in their melting points is utilized to achieve better weld sealing.

[0038] In some embodiments of this utility model, reference is made to Figure 3 The wall thickness of the shell 10 is 0.05mm to 0.20mm. For example, the wall thickness t1 of the shell 10 can be 0.05mm, 0.08mm, 0.10mm, 0.12mm, 0.15mm, 0.18mm, 0.20mm, etc. By setting the wall thickness of the shell 10 within the range of 0.05mm to 0.20mm, the wall thickness of the shell 10 can be relatively thin while still meeting the structural strength requirements.

[0039] In some embodiments of this utility model, the wall thickness of the cover plate 20 is 0.075mm to 0.15mm. For example, the wall thickness t2 of the cover plate 20 can be 0.075mm, 0.010mm, 0.012mm, 0.13mm, 0.14mm, 0.15mm, etc. By setting the wall thickness range of the cover plate 20 to 0.075mm to 0.15mm, the wall thickness of the cover plate 20 can be relatively thin while still meeting the structural strength requirements.

[0040] In some embodiments of this utility model, the cover plate 20 is made of stainless steel, and the wall thickness of the cover plate 20 is 0.075mm to 0.15mm. By using stainless steel as the material for the cover plate 20 and setting the wall thickness range of the cover plate 20 to 0.075mm to 0.15mm, the wall thickness of the cover plate 20 can be relatively thin while still meeting the structural strength requirements.

[0041] In some embodiments of this utility model, reference is made to Figures 1-6 The housing 10 is provided with an injection hole 12, and a sealing pin 30 is provided at the injection hole 12 to seal the injection hole 12. The injection hole 12 facilitates the injection of electrolyte into the battery housing 100. The inner circumferential surface of the injection hole 12 is a first sealing surface 13, and at least a portion of the outer circumferential surface of the sealing pin 30 constitutes a second sealing surface 33, which is in a sealing fit with the first sealing surface 13. This allows the sealing pin 30 to better seal the injection hole 12, improving the sealing performance of the assembly between the sealing pin 30 and the housing 10.

[0042] Both the second sealing surface 33 and the first sealing surface 13 are arc-shaped, which allows the sealing pin 30 to fit better with the housing 10, resulting in better sealing. Furthermore, when the sealing pin 30 is welded to the housing 10, the better fit between the sealing pin 30 and the housing 10 reduces the risk of incomplete welding and weld spalling.

[0043] Optionally, both the second sealing surface 33 and the first sealing surface 13 are arc-shaped surfaces that bulge toward the central axis of the injection hole 12.

[0044] In some embodiments of this utility model, reference is made to Figures 3-6The sealing pin 30 includes a plugging portion 31 and a flange portion 32. The plugging portion 31 is accommodated in the injection hole 12 and has a second sealing surface 33. At least a portion of the outer peripheral surface of the plugging portion 31 constitutes the second sealing surface 33. The flange portion 32 is connected to the outer peripheral side of the plugging portion 31 and is located outside the housing 10. The surface of the housing 10 facing the flange portion 32 is a third sealing surface 14, and the surface of the flange portion 32 facing the housing 10 is a fourth sealing surface 34. Both the third sealing surface 14 and the fourth sealing surface 34 are planar and fit together in a sealing manner. The third sealing surface 14 is smoothly connected to the first sealing surface 13, and the fourth sealing surface 34 is smoothly connected to the second sealing surface 33. By configuring the sealing pin 30 to include a plugging part 31 and a flange part 32, with the plugging part 31 accommodated in the injection hole 12 to block the injection hole 12 and the flange part 32 located on the outside of the housing 10, the mating area between the sealing pin 30 and the housing 10 can be increased, which is beneficial to improving the sealing performance of the sealing pin 30 and the housing 10 and the installation reliability of the sealing pin 30. In addition, by making the third sealing surface 14 on the housing 10 smoothly transition to the first sealing surface 13 on the inner circumference side of the injection hole 12 and the fourth sealing surface 34 on the flange part 32 smoothly transition to the second sealing surface 33 on the outer circumference side of the plugging part 31, the fit between the sealing pin 30 and the housing 10 can be further improved, further enhancing the sealing performance of the sealing pin 30 and the housing 10, and helping to reduce the problems of incomplete welding and weld explosion when welding the sealing pin 30 and the housing 10.

[0045] In some embodiments of this utility model, reference is made to Figures 3-6 The thickness of flange portion 32 is 0.075mm to 0.20mm. For example, the thickness t3 of flange portion 32 can be 0.075mm, 0.10mm, 0.12mm, 0.15mm, 0.18mm, 0.20mm, etc. By setting the thickness range of flange portion 32 to 0.075mm to 0.20mm, the thickness of flange portion 32 can be relatively thin, which facilitates the penetration of laser energy into flange portion 32 during laser welding with shell 10, and this thickness can meet the structural strength requirements of flange portion 32.

[0046] In some embodiments of this utility model, reference is made to Figures 3-6 A groove 35 is formed on the outer side of the sealing part 31. By forming a groove 35 on the outer side of the sealing part 31, the weight of the sealing nail 30 can be reduced, which helps to reduce the total weight of the battery casing 100. It also allows the sealing part 31 to be thinner, so that the laser energy can penetrate the sealing part 31 when the sealing part 31 is laser welded to the casing 10, and the thickness can meet the structural strength requirements of the sealing part 31.

[0047] In some embodiments of this utility model, reference is made to Figures 1-6The casing 10 has an injection hole 12, and a sealing pin 30 is provided at the injection hole 12 to seal it. The injection hole 12 facilitates the injection of electrolyte into the battery casing 100. The sealing pin 30 is a metal part, welded to the casing 10. The melting point of the sealing pin 30 is different from that of the casing 10. Welding the sealing pin 30 to the casing 10 facilitates secure fixation and connection. The difference in melting points allows the lower-melting-point material (e.g., the sealing pin 30) to melt preferentially during welding, filling the microscopic gaps of the higher-melting-point material (e.g., the casing 10) through capillary action, forming a dense metallurgical bonding layer. This structure reduces porosity and incomplete melting defects, improving sealing performance and resulting in a better seal between the sealing pin 30 and the casing 10.

[0048] Optionally, the sealing pin 30 can be made of stainless steel.

[0049] Optionally, the absolute value of the difference in melting points between the sealing pin 30 and the housing 10 is 200℃~300℃.

[0050] Reference Figure 7 According to a second aspect embodiment of the present invention, a battery cell 200 includes a battery casing 100 according to the first aspect embodiment of the present invention and an electrode assembly 40, wherein the electrode assembly 40 is disposed within the battery casing 100.

[0051] The electrode assembly 40 may include electrode sheets and a diaphragm disposed between the electrode sheets. The electrode assembly 40 may be a wound structure or a stacked structure.

[0052] According to the battery cell 200 of this utility model embodiment, by providing the battery casing 100 described above, the welding seal between the cover plate 20 and the casing 10 of the battery casing is better, which is beneficial to improving the overall performance of the battery.

[0053] Reference Figure 8 According to a third aspect embodiment of the present invention, the battery device 300 includes: a housing 50; and a battery cell 200 according to the second aspect embodiment of the present invention, wherein the battery cell 200 is disposed within the housing 50, and multiple battery cells 200 may be disposed within the housing 50.

[0054] Among them, the battery device 300 can be used as an energy storage device.

[0055] According to the embodiment of the present utility model, the battery device 300, by setting the above-mentioned battery cell 200, is beneficial to improving the overall performance and service life of the battery device 300.

[0056] Reference Figure 9 The electrical device 500 according to the fourth aspect of the present invention includes: the battery device 300 according to the third aspect of the present invention described above.

[0057] The electrical device 500 can be a vehicle, and the battery device 300 can be installed at the bottom of the vehicle body.

[0058] According to the embodiment of the present utility model, the power device 500, by setting the above-mentioned battery device 300, has better overall performance and service life, which is conducive to extending the battery life of the power device 500.

[0059] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0060] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0061] In the description of this utility model, "multiple" means two or more.

[0062] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0063] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery casing, characterized in that, include: A housing, the housing being a metal component, the housing having an opening on at least one side; A cover plate, which is a metal part and is placed over the opening, is welded to the housing, and the melting point of the cover plate is different from that of the housing.

2. The battery casing according to claim 1, characterized in that, The absolute value of the difference in melting points between the shell and the cover plate is 100℃~300℃.

3. The battery casing according to claim 1, characterized in that, The melting point of the shell is greater than that of the cover plate.

4. The battery casing according to claim 1, characterized in that, The cover plate is made of stainless steel, and the housing is made of titanium or titanium alloy; and / or, the surface of the cover plate is provided with a nickel plating layer.

5. The battery casing according to claim 1, characterized in that, The wall thickness of the housing is 0.05 mm to 0.20 mm; and / or the wall thickness of the cover plate is 0.075 mm to 0.15 mm.

6. The battery casing according to any one of claims 1-5, characterized in that, The housing is provided with a liquid injection hole, and a sealing pin is provided at the liquid injection hole to seal the liquid injection hole; Wherein, the inner circumferential surface of the injection hole is the first sealing surface, and at least a portion of the outer circumferential surface of the sealing pin constitutes the second sealing surface. The second sealing surface and the first sealing surface are both arc-shaped surfaces and are sealed together.

7. The battery casing according to claim 6, characterized in that, The sealing pin includes a plugging part and a flange part. The plugging part is accommodated in the injection hole and has a second sealing surface. The flange part is connected to the outer periphery of the plugging part and is located on the outside of the housing. The surface of the housing facing the flange part is a third sealing surface, and the surface of the flange part facing the housing is a fourth sealing surface. The third sealing surface and the fourth sealing surface are both planar and sealingly fitted. The third sealing surface is smoothly connected to the first sealing surface, and the fourth sealing surface is smoothly connected to the second sealing surface.

8. The battery casing according to claim 7, characterized in that, The thickness of the flange portion is 0.075 mm to 0.20 mm; and / or, a groove is formed on the outer side of the sealing portion.

9. The battery casing according to any one of claims 1-5, characterized in that, The housing is provided with a liquid injection hole, and a sealing pin is provided at the liquid injection hole to seal the liquid injection hole; The sealing pin is a metal part and is welded to the housing. The melting point of the sealing pin is different from that of the housing.

10. A single battery cell, characterized in that, include: Battery casing according to any one of claims 1-9; An electrode assembly is disposed within the battery casing.

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