Cylindrical battery steel shell structure convenient to recycle and cylindrical battery using same

Abstract

The utility model relates to a cylindrical battery steel shell structure convenient to recycle and a cylindrical battery using the same, and belongs to the field of cylindrical batteries, the cylindrical battery steel shell structure convenient to recycle comprises a shell which is of a cylindrical structure with a sealed lower end, and further comprises a circular-plate-shaped positive electrode end cover which is arranged at the top end of the shell and matched with the shell in a sealing mode. A protective cover plate is further fixedly arranged on the upper surface of the positive electrode end cover, and the protective cover plate is attached to the positive electrode end cover and is in sealing fit with the positive electrode end cover; a pressure relief hole is formed in the positive electrode end cover, a first through hole is formed in the protective cover plate, the first through hole covers the pressure relief hole, and an aluminum plastic film for sealing the first through hole is arranged in the first through hole; the protective cover plate is further provided with at least one second through hole provided with an aluminum-plastic film, the second through holes do not coincide with the first through holes, and the second through holes coincide with the first through holes rotating around the axis of the positive electrode end cover by an angle a. According to the utility model, the cylindrical battery steel shell can be conveniently recycled, and the recycling cost of the steel shell is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical batteries, and in particular to a cylindrical battery steel shell structure that is easy to recycle and a cylindrical battery using the same. Background Technology

[0002] With the widespread application of energy storage devices such as lithium-ion and sodium-ion batteries, cylindrical steel-cased batteries have become one of the mainstream choices in consumer electronics, power batteries, and energy storage systems due to their high energy density, excellent mechanical strength, and good sealing performance. However, with the continuous growth in battery demand, the number of waste batteries is also increasing rapidly. How to efficiently and environmentally recycle and process waste cylindrical batteries has become an important issue in the current technological field.

[0003] Currently, because the pressure relief structure of traditional steel-cased cylindrical batteries is often a disposable structure that cannot be reused after one use, the pressure relief structure of the steel casing needs to be restored when recycling the steel casing, which significantly increases the difficulty of the steel casing recycling process and results in high steel casing recycling costs.

[0004] Based on this, the present invention provides a cylindrical battery steel shell structure that is easy to recycle and a cylindrical battery using the same. By setting a pressure relief structure on the steel shell that can be used multiple times, the cost of recycling the steel shell is reduced. Utility Model Content

[0005] Based on this, it is necessary to provide a cylindrical battery steel shell structure that is easy to recycle, including an outer shell, the outer shell being a cylindrical structure with a sealed bottom, and a positive terminal cap in the shape of a circular plate. The positive terminal cap is disposed at the top of the outer shell and is sealed to the outer shell. A protective cover plate is also fixedly disposed on the upper surface of the positive terminal cap, the protective cover plate being fitted to the positive terminal cap and sealed to the positive terminal cap. A pressure relief hole is formed on the positive terminal cap, penetrating vertically. A first through hole is formed on the protective cover plate corresponding to the pressure relief hole, penetrating vertically through the protective cover plate. The first through hole covers the pressure relief hole, and an aluminum-plastic film is disposed inside the first through hole to seal the first through hole. The protective cover plate also has at least one second through hole, penetrating vertically through the protective cover plate. The second through hole does not coincide with the first through hole, and the second through hole coincides with the first through hole rotated by an angle α around the axis of the positive terminal cap, where 0° < angle α < 360°. An aluminum-plastic film is disposed inside the second through hole to seal the second through hole.

[0006] The steel shell structure in this invention can be applied to cylindrical lithium-ion batteries and cylindrical sodium-ion batteries.

[0007] In this invention, the protective cover plate attached to the positive terminal cover is sealed to the positive terminal cover, and the first through hole on the protective cover plate, which is sealed with aluminum-plastic film, covers the pressure relief hole. Therefore, the outer shell has a closed structure, which can support the normal use of cylindrical lithium-ion batteries and cylindrical sodium-ion batteries.

[0008] In this invention, because the interior of the outer casing is sealed by an aluminum-plastic film within the first through-hole, the aluminum-plastic film within the first through-hole will rupture when the battery malfunctions and causes a surge in internal pressure, thus preventing battery explosion. Furthermore, after the aluminum-plastic film within the first through-hole ruptures, the protective cover can be removed from the positive terminal cover, rotated until the second through-hole on the protective cover covers the pressure relief hole of the positive terminal cover, and then the protective cover can be reattached to the positive terminal cover, allowing it to continue sealing the outer casing. Therefore, the steel casing structure of this invention does not require restoration of the pressure relief structure during recycling. Moreover, the cost of adding the protective cover in this invention is extremely low compared to the cost of a conventional pressure relief structure in a steel casing. Therefore, this invention effectively reduces the cost of recycling the steel casing structure of cylindrical batteries.

[0009] Furthermore, the top of the outer shell partially tapers inward to form an annular groove, which forms a retaining ring inside the outer shell. The portion of the outer shell above the retaining ring forms an installation space, the height of which is greater than the sum of the thicknesses of the positive end cap and the protective cover.

[0010] In this invention, the annular groove at the top of the outer casing forms a retaining ring inside the casing, which supports the positive terminal cover and facilitates its installation. During installation, the positive terminal cover is welded to the positive terminal post inside the battery, with the edge of the positive terminal cover abutting against the retaining ring via an insulating gasket. This ensures insulation between the positive terminal cover and the outer casing while securing the positive terminal cover.

[0011] In this invention, the height of the installation space is greater than the sum of the thicknesses of the positive end cap and the protective cover. Therefore, the top of the outer shell is located above the protective cover, enclosing it and providing some protection for the protective cover, thus reducing the chance of the aluminum-plastic film on the protective cover being damaged by external objects.

[0012] Furthermore, the center of the positive end cap protrudes upwards, forming a cylindrical convex cap.

[0013] In this invention, the convex cap formed in the middle of the positive terminal cover can be used for the insertion of the positive terminal post inside the battery. By welding the convex cap to the positive terminal post, the positive terminal cover can be installed and fixed on the outer shell, making its connection structure more robust. At the same time, it can better distinguish the positive and negative terminals of the battery.

[0014] Furthermore, the protective cover plate has a mounting hole corresponding to the convex cap. The mounting hole is fitted onto the convex cap, and the inner sidewall of the mounting hole is fitted to the outer sidewall of the convex cap. The inner sidewall of the mounting hole and the outer sidewall of the convex cap are slidably matched.

[0015] In this invention, the protective cover is fitted onto the convex cap. Therefore, the convex cap can position the protective cover, making it easier and faster to rotate the second through hole on the protective cover to cover the pressure relief hole.

[0016] Furthermore, the protective cover is adhered to the upper surface of the positive end cover by adhesive and is sealed to the upper surface of the positive end cover.

[0017] In this invention, the adhesive used to adhere the positive end cap and the protective cover can be epoxy resin, polyurethane, or fluororubber, all of which possess good heat resistance and sealing properties. Furthermore, when the protective cover needs to be removed from the positive end cap, the removal operation can be easily performed by selecting the appropriate solvent. Therefore, using adhesive to fix and seal the positive end cap and the protective cover also facilitates the removal of the protective cover.

[0018] Furthermore, the protective cover is circular, and the diameter of the protective cover is smaller than the diameter of the positive end cover.

[0019] In this invention, the diameter of the protective cover is smaller than that of the positive end cap, so the protective cover will not abut against the inner wall of the outer shell, thus avoiding the presence of the protective cover affecting the removal of the positive end cap during the recycling process.

[0020] In addition, this utility model also provides a cylindrical battery that uses the above-mentioned cylindrical battery steel shell structure that is easy to recycle.

[0021] The principle and effects of this utility model will be further explained below with reference to the above technical solution and the accompanying drawings:

[0022] In this invention, because the interior of the outer casing is sealed by an aluminum-plastic film within the first through-hole, the aluminum-plastic film within the first through-hole will rupture when the battery malfunctions and causes a surge in internal pressure, thus preventing battery explosion. Furthermore, after the aluminum-plastic film within the first through-hole ruptures, the protective cover can be removed from the positive terminal cover, rotated until the second through-hole on the protective cover covers the pressure relief hole of the positive terminal cover, and then the protective cover can be reattached to the positive terminal cover, allowing it to continue sealing the outer casing. Therefore, the steel casing structure of this invention does not require restoration of the pressure relief structure during recycling. Moreover, the cost of adding the protective cover in this invention is extremely low compared to the cost of a conventional pressure relief structure in a steel casing. Therefore, this invention effectively reduces the cost of recycling the steel casing structure of cylindrical batteries. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of the cylindrical battery steel shell structure that is easy to recycle, as described in an embodiment of this utility model.

[0024] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0025] Figure 3 This is a schematic diagram of the structure of the positive end cap according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the protective cover plate described in an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the connection structure between the protective cover and the positive end cover according to an embodiment of the present invention.

[0028] Attached Figure

[0029] 1-Outer shell, 11-Installation space, 12-Annular groove, 13-Retaining ring, 2-Positive end cap, 21-Convex cap, 22-Pressure relief hole, 3-Protective cover, 31-Installation hole, 32-First through hole, 33-Second through hole. Detailed Implementation

[0030] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0031] like Figure 1-5 A recyclable cylindrical battery casing structure includes an outer casing 1, which is a cylindrical structure with a sealed lower end. It also includes a positive terminal cover 2 in the shape of a circular plate, which is located at the top of the outer casing 1 and is sealed to it. A protective cover 3 is fixedly mounted on the upper surface of the positive terminal cover 2, and is fitted to and sealed to the positive terminal cover 2. The positive terminal cover 2 has a pressure relief hole 22 extending vertically through it, and the protective cover 3 has a corresponding vertically extending section extending vertically through the pressure relief hole 22. The protective cover 3 has a first through hole 32 that covers the pressure relief hole 22 and is provided with an aluminum-plastic film to seal the first through hole 32. The protective cover 3 also has at least one second through hole 33 that runs vertically through the protective cover 3. The second through hole 33 does not coincide with the first through hole 32 and coincides with the first through hole 32 that rotates by an angle a around the axis of the positive end cover 2, where 0° < angle a < 360°. The second through hole 33 is provided with an aluminum-plastic film to seal the second through hole 33.

[0032] The steel shell structure in this invention can be applied to cylindrical lithium-ion batteries and cylindrical sodium-ion batteries.

[0033] In this invention, the protective cover 3 plate attached to the positive terminal cover 2 is sealed to the positive terminal cover 2, and the first through hole 32 sealed by aluminum-plastic film on the protective cover 3 plate covers the pressure relief hole 22. Therefore, the outer shell 1 has a closed structure as a whole, which can support the normal use of cylindrical lithium-ion batteries and cylindrical sodium-ion batteries.

[0034] In this invention, since the interior of the outer casing 1 is sealed by the aluminum-plastic film inside the first through-hole 32, the aluminum-plastic film inside the first through-hole 32 will rupture when the internal air pressure increases sharply due to abnormal battery operation, thus preventing battery explosion. Furthermore, after the aluminum-plastic film inside the first through-hole 32 ruptures, the protective cover 3 can be removed from the positive terminal cover 2, rotated until the second through-hole 33 on the protective cover 3 covers the pressure relief hole 22 of the positive terminal cover 2, and then the protective cover 3 can be re-fixed onto the positive terminal cover 2, allowing the protective cover 3 to continue sealing the outer casing 1. Therefore, the steel casing structure of this invention does not require restoration of the pressure relief structure during recycling. Moreover, the cost of adding the protective cover 3 in this invention is extremely low compared to the cost of a conventional pressure relief structure for a steel casing. Therefore, this invention can effectively reduce the cost of recycling the steel casing structure of cylindrical batteries.

[0035] In one embodiment, the top of the outer shell 1 is partially contracted inward to form an annular groove 12. The annular groove 12 forms a retaining ring 13 inside the outer shell 1. The portion of the outer shell 1 above the retaining ring 13 forms an installation space 11. The height of the installation space 11 is greater than the sum of the thicknesses of the positive end cap 2 and the protective cover 3.

[0036] In this embodiment, the annular groove 12 at the top of the outer casing 1 forms a retaining ring 13 inside the outer casing 1, which can support the positive terminal cover 2 and facilitate the installation of the positive terminal cover 2. When installing the positive terminal cover 2, it needs to be welded to the positive electrode post inside the battery, and the edge of the positive terminal cover 2 should abut against the retaining ring 13 through an insulating gasket, so as to ensure insulation between the positive terminal cover 2 and the outer casing 1 while fixing the positive terminal cover 2.

[0037] In this utility model, the height of the installation space 11 is greater than the sum of the thicknesses of the positive end cover 2 and the protective cover 3. Therefore, the top of the outer shell 1 will be located above the protective cover 3, enclosing the protective cover 3 and providing a certain degree of protection for the protective cover 3, reducing the chance of the aluminum-plastic film on the protective cover 3 being damaged by external objects.

[0038] In one embodiment, the positive end cap 2 protrudes upward at the middle position to form a cylindrical convex cap 21.

[0039] In this embodiment, the convex cap 21 formed in the middle of the positive terminal cover 2 can be used for the insertion of the positive electrode post inside the battery. By welding the convex cap 21 to the positive electrode post, the positive terminal cover 2 can be installed and fixed on the outer shell 1, making its connection structure more robust. At the same time, the positive and negative terminals of the battery can be better distinguished.

[0040] In one embodiment, the protective cover 3 has a mounting hole 31 corresponding to the convex cap 21. The mounting hole 31 is sleeved on the convex cap 21, the inner sidewall of the mounting hole 31 is fitted to the outer sidewall of the convex cap 21, and the inner sidewall of the mounting hole 31 and the outer sidewall of the convex cap 21 are slidably matched.

[0041] In this embodiment, the protective cover 3 is sleeved on the convex cap 21. Therefore, the convex cap 21 can play a positioning role for the protective cover 3, and can more conveniently and quickly rotate the second through hole 33 on the protective cover 3 to cover the pressure relief hole 22.

[0042] In one embodiment, the protective cover 3 is adhered to the upper surface of the positive end cover 2 by adhesive and is sealed to the upper surface of the positive end cover 2.

[0043] In this embodiment, the adhesive used to adhere the positive end cap 2 and the protective cover 3 can be epoxy resin, polyurethane, or fluororubber, all of which have good heat resistance and sealing properties. When it is necessary to remove the protective cover 3 from the positive end cap 2, the removal operation can be easily performed by using the appropriate solvent. Therefore, using adhesive to fix and seal the positive end cap 2 and the protective cover 3 also facilitates the removal of the protective cover 3.

[0044] In one embodiment, the protective cover 3 is circular, and the diameter of the protective cover 3 is smaller than the diameter of the positive end cover 2.

[0045] In this embodiment, the diameter of the protective cover 3 is smaller than the diameter of the positive end cover 2, so the protective cover 3 will not abut against the inner wall of the outer shell 1, which can avoid the presence of the protective cover 3 affecting the removal of the positive end cover 2 during the recycling process.

[0046] One embodiment is a cylindrical battery that uses the aforementioned cylindrical battery steel casing structure that facilitates recycling.

[0047] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A cylindrical battery steel casing structure for easy recycling, comprising an outer casing, the outer casing being a cylindrical structure with a sealed lower end, and a positive terminal cap in the shape of a circular plate, the positive terminal cap being disposed at the top of the outer casing and sealingly fitted with the outer casing, characterized in that, A protective cover plate is fixedly installed on the upper surface of the positive end cap. The protective cover plate is fitted to the positive end cap and is sealed to it. A pressure relief hole is provided on the positive end cap, and a first through hole is provided on the protective cover plate corresponding to the pressure relief hole. The first through hole covers the pressure relief hole and is filled with an aluminum-plastic film to seal the first through hole. At least one second through hole is also provided on the protective cover plate, which does not coincide with the first through hole. The second through hole coincides with the first through hole rotated by an angle α around the axis of the positive end cap, where 0° < angle α < 360°. An aluminum-plastic film is provided in the second through hole to seal the second through hole.

2. The cylindrical battery steel shell structure for easy recycling according to claim 1, characterized in that, The top of the outer casing partially tapers inward to form an annular groove. The annular groove forms a retaining ring inside the outer casing. The portion of the outer casing above the retaining ring forms an installation space. The height of the installation space is greater than the sum of the thicknesses of the positive end cap and the protective cover.

3. A cylindrical battery steel shell structure for easy recycling according to claim 1 or 2, characterized in that, The positive end cap protrudes upwards at the middle position, forming a cylindrical convex cap.

4. The cylindrical battery steel shell structure for easy recycling according to claim 3, characterized in that, The protective cover plate has a mounting hole corresponding to the convex cap. The mounting hole is fitted onto the convex cap, and the inner sidewall of the mounting hole is fitted to the outer sidewall of the convex cap. The inner sidewall of the mounting hole and the outer sidewall of the convex cap are slidably matched.

5. The cylindrical battery steel shell structure for easy recycling according to claim 1, characterized in that, The protective cover is adhered to the upper surface of the positive end cover by adhesive and is sealed to the upper surface of the positive end cover.

6. The cylindrical battery steel shell structure for easy recycling according to claim 5, characterized in that, The protective cover is circular, and its diameter is smaller than that of the positive end cover.

7. A cylindrical battery, characterized in that, The cylindrical battery steel casing structure described in any one of claims 1-6 is used for easy recycling.

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