Battery winding shaft

Abstract

The utility model belongs to the battery production technical field discloses a kind of battery winding shaft, including inner shaft, middle shaft and outer sleeve, inner shaft is movably arranged in middle shaft, middle shaft is movably arranged in outer sleeve, outer sleeve has first axis, and inner shaft and middle shaft can rotate around first axis, and the outer peripheral wall of inner shaft is provided with at least one first spiral oil groove, and first spiral oil groove is spirally arranged around first axis.The battery winding shaft of the utility model is provided with first spiral oil groove on the outer peripheral wall of inner shaft, so that the lubricating oil in first spiral oil groove can be continuously and uniformly delivered to the surface of inner shaft during the rotation of inner shaft, to reduce the friction and wear between inner shaft and middle shaft;By the structure of first spiral oil groove spirally around first axis, impurities and particles adhered to the outer peripheral wall of inner shaft can be pushed along first spiral oil groove and discharged during the rotation of inner shaft by centrifugal force, to ensure the cleanliness of the outer peripheral wall surface of inner shaft.

Description

Technical Field

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

[0002] With the development and maturation of new energy technologies, the types and sizes of power batteries in the new energy field are increasing, and the demand is also growing. In the production of power batteries, the winding of battery cells is mainly achieved through winding shafts. However, during operation, the winding shafts rub against each other, generating a large amount of heat, which affects their service life. Therefore, lubrication of the winding shafts is essential. However, currently, winding shafts generally adopt a smooth cylindrical structure, which makes lubricant prone to leakage, requiring regular lubrication replenishment, a cumbersome operation. Utility Model Content

[0003] The purpose of this invention is to provide a battery winding shaft with a simple structure and a first spiral oil groove that provides even lubrication and effectively reduces the loss of lubricating oil.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A battery winding shaft is provided, comprising an inner shaft, a middle shaft, and an outer sleeve. The inner shaft is movably disposed within the middle shaft, and the middle shaft is movably disposed within the outer sleeve. The outer sleeve has a first axis. Both the inner shaft and the middle shaft are rotatable around the first axis. The outer peripheral wall of the inner shaft is provided with at least one first spiral oil groove, which is spirally arranged around the first axis.

[0006] As a preferred embodiment of the battery winding shaft, the inner shaft has a first end exposed above the central shaft, the first helical oil groove extending at least through the first end, and the end of the first helical oil groove away from the first end located within the central shaft; and / or

[0007] Along the length of the inner shaft, the width of the first spiral oil groove adjacent to the first end is smaller than the width of the first spiral oil groove farther from the first end; and / or,

[0008] Along the length of the inner shaft, the groove depth of the first spiral oil groove adjacent to the first end is less than the groove depth of the first spiral oil groove away from the first end.

[0009] As a preferred embodiment of the battery winding shaft, the width of the first spiral oil groove is D1, where 2mm ≤ D1 ≤ 4mm; and / or,

[0010] The depth of the first spiral oil groove is H1, 0.5mm ≤ H1 ≤ 1mm; and / or,

[0011] The groove spacing of the first spiral oil groove is P1, where 25mm≤P1≤35mm.

[0012] As a preferred embodiment of the battery winding shaft, the outer peripheral wall of the central shaft is provided with at least one second spiral oil groove, which is spirally arranged around the first axis.

[0013] As a preferred embodiment of the battery winding shaft, the central shaft has a second end exposed outside the outer casing, the second spiral oil groove extending at least through the second end, and the end of the second spiral oil groove away from the second end located inside the outer casing; and / or

[0014] Along the length of the central axis, the width of the second spiral oil groove adjacent to the second end is smaller than the width of the second spiral oil groove farther from the second end; and / or,

[0015] Along the length of the central axis, the groove depth of the second spiral oil groove near the second end is less than the groove depth of the second spiral oil groove away from the second end.

[0016] As a preferred embodiment of the battery winding shaft, the width of the second spiral oil groove is D2, where 2mm ≤ D2 ≤ 4mm; and / or,

[0017] The depth of the second spiral oil groove is H2, 0.5mm ≤ H2 ≤ 1mm; and / or,

[0018] The groove spacing of the second spiral oil groove is P2, 25mm≤P2≤35mm.

[0019] As a preferred embodiment of the battery winding shaft, the bottom cross-section of the first spiral oil groove and / or the second spiral oil groove is arc-shaped.

[0020] As a preferred embodiment of the battery winding shaft, the outer peripheral wall of the central shaft is provided with a plurality of oil guide holes, which can communicate with the first spiral oil groove.

[0021] As a preferred embodiment of the battery winding shaft, multiple sets of oil guide hole groups are provided at intervals on the outer peripheral wall of the central shaft along the length of the central shaft. Each set of oil guide hole groups includes multiple oil guide holes, and all the oil guide holes in the oil guide hole group are evenly distributed around the first axis.

[0022] As a preferred embodiment of the battery winding shaft, the inner wall of the outer sleeve and / or the inner wall of the central shaft are provided with reinforcing oil grooves.

[0023] The beneficial effects of this utility model are as follows: By setting a first spiral oil groove on the outer peripheral wall of the inner shaft, the lubricating oil in the first spiral oil groove can be continuously and evenly delivered to the surface of the inner shaft during the rotation of the inner shaft, reducing friction and wear between the inner shaft and the central shaft, optimizing the distribution of heat generated by friction, reducing the occurrence of local overheating, and improving the stability of the winding shaft operation; moreover, the groove structure can prevent the lubricating oil from flowing out or evaporating too quickly, thereby reducing the consumption of lubricating oil and lowering the operating costs during long-term operation; by setting the first spiral oil groove in a spiral shape around the first axis, the impurities and particles adhering to the outer peripheral wall of the inner shaft can be pushed and discharged along the first spiral oil groove by centrifugal force during the rotation of the inner shaft, ensuring the cleanliness of the outer peripheral wall surface of the inner shaft. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of the battery winding shaft according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of the battery winding shaft according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the inner shaft structure according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the central axis in an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Inner shaft; 11. First spiral oil groove; 12. First end; 2. Central shaft; 21. Second spiral oil groove; 22. Second end; 3. Outer sleeve. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] like Figure 1 and Figure 2 As shown, the battery winding shaft of this embodiment includes an inner shaft 1, a middle shaft 2, and an outer sleeve 3. The inner shaft 1 is movably disposed within the middle shaft 2, and the middle shaft 2 is movably disposed within the outer sleeve 3. The outer sleeve 3 has a first axis, and both the inner shaft 1 and the middle shaft 2 can rotate around the first axis. The outer peripheral wall of the inner shaft 1 is provided with at least one first spiral oil groove 11, which is spirally arranged around the first axis. During the operation of the battery winding shaft, the outer sleeve 3 is fixed, the middle shaft 2 can rotate relative to the outer sleeve 3 in a specified direction and reciprocate to extend or retract within the outer sleeve 3, and the inner shaft 1 can rotate relative to the outer sleeve 3 in a specified direction and reciprocate to extend or retract within the middle shaft 2 (the specified direction is either clockwise or counterclockwise for both the inner shaft 1 and the middle shaft 2).

[0036] It is understandable that by setting the first spiral oil groove 11 on the outer peripheral wall of the inner shaft 1, the lubricating oil in the first spiral oil groove 11 can be continuously and evenly delivered to the surface of the inner shaft 1 during the rotation of the inner shaft 1, reducing the friction and wear between the inner shaft 1 and the central shaft 2, optimizing the distribution of heat generated by friction, reducing the occurrence of local overheating, and improving the stability of the winding shaft operation; and the groove structure can prevent the lubricating oil from being lost or evaporated too quickly, thereby reducing the consumption of lubricating oil, and the equipment does not need to frequently add or replace lubricating oil during operation, reducing the operating cost in the long term; through the spiral structure of the first spiral oil groove 11 surrounding the first axis, the impurities and particles adhering to the outer peripheral wall of the inner shaft 1 can be pushed and discharged along the first spiral oil groove 11 by centrifugal force during the rotation of the inner shaft 1, ensuring the cleanliness of the outer peripheral wall surface of the inner shaft 1.

[0037] Furthermore, the outer peripheral wall of the central shaft 2 is provided with at least one second spiral oil groove 21, which is spirally arranged around the first axis. By providing the second spiral oil groove 21 on the outer peripheral wall of the central shaft 2, the lubricating oil in the second spiral oil groove 21 can be continuously and evenly delivered to the surface of the inner shaft 1 during the rotation of the central shaft 2, reducing friction and wear between the central shaft 2 and the outer sleeve 3, reducing noise caused by friction, optimizing the distribution of heat generated by friction, reducing the occurrence of local overheating, and improving the stability of the winding shaft operation; and the groove structure can prevent the lubricating oil from flowing out or evaporating too quickly, thereby reducing the consumption of lubricating oil, eliminating the need for frequent addition or replacement of lubricating oil during equipment operation, and reducing long-term operating costs; through the spiral arrangement of the second spiral oil groove 21 around the first axis, the impurities and particles adhering to the outer peripheral wall of the central shaft 2 can be pushed and discharged along the second spiral oil groove 21 by centrifugal force during the rotation of the central shaft 2, ensuring the surface cleanliness of the outer peripheral wall of the central shaft 2 and the inner side wall of the outer sleeve 3.

[0038] Furthermore, multiple oil guide holes are provided through the outer peripheral wall of the central shaft 2, and these holes communicate with the first spiral oil groove 11. Through these oil guide holes, lubricating oil in the first spiral oil groove 11 or on the outer peripheral wall of the inner shaft 1 can flow through the oil guide holes to the outer peripheral wall of the central shaft 2 under centrifugal force, thereby lubricating the outer peripheral wall of the central shaft 2 and the inner sidewall of the outer sleeve 3. The oil guide holes can effectively lubricate the fit between the central shaft 2 and the outer sleeve 3 when the outer peripheral wall of the central shaft 2 is a smooth shaft. Alternatively, when the outer peripheral wall of the central shaft 2 is provided with a second spiral oil groove 21, the lubricating oil in the first spiral oil groove 11 can be guided into the second spiral oil groove 21 for lubrication, improving the utilization rate of the lubricating oil.

[0039] Preferably, multiple sets of oil guide holes are spaced apart on the outer peripheral wall of the central shaft 2 along its length. Each set of oil guide holes includes multiple oil guide holes, and all the oil guide holes in the set are evenly distributed around the first axis. By arranging multiple oil guide holes around the first axis, the lubricant can be continuously guided through different oil guide holes during the rotation of the inner shaft 1, ensuring the lubrication effect on the outer peripheral wall of the central shaft 2.

[0040] In this embodiment, only one spiral oil groove is provided on the outer peripheral wall of the inner shaft 1 and the outer peripheral wall of the middle shaft 2. In practical applications, to improve the lubrication effect of the inner shaft 1, the middle shaft 2, and the outer sleeve 3, two, three, or more spiral oil grooves can be provided on the outer peripheral walls of the inner shaft 1 and the middle shaft 2. It should be noted that when multiple spiral oil grooves are provided on the outer peripheral walls of the inner shaft 1 and the middle shaft 2, it should be ensured that the spiral oil grooves are parallel to each other to ensure that impurities and particles on the outer peripheral wall are pushed and discharged along the spiral oil grooves, and to avoid impurities and particles getting stuck at the connection of the spiral oil grooves.

[0041] Furthermore, such as Figure 1 and Figure 3 As shown, the inner shaft 1 has a first end 12 exposed above the middle shaft 2. A first spiral oil groove 11 at least penetrates the first end 12. The end of the first spiral oil groove 11 away from the first end 12 is located inside the middle shaft 2. By setting the end of the first spiral oil groove 11 through the first end 12, impurities and particles on the outer peripheral wall of the inner shaft 1 can be pushed to the first end 12 and discharged. The end of the first spiral oil groove 11 away from the first end 12 is located inside the middle shaft 2 to ensure that the first spiral oil groove 11 passes through the mating part between the inner shaft 1 and the middle shaft 2, so as to ensure that the lubricating oil in the first spiral oil groove 11 can lubricate the mating part between the inner shaft 1 and the middle shaft 2. Of course, the end of the first spiral oil groove 11 away from the first end 12 can also directly penetrate the end of the inner shaft 1 away from the first end 12 to facilitate the opening of the first spiral oil groove 11 on the inner shaft 1.

[0042] In addition, such as Figure 1 and Figure 4As shown, the central shaft 2 has a second end 22 exposed in the outer sleeve 3. The second spiral oil groove 21 at least penetrates the second end 22. The end of the second spiral oil groove 21 away from the second end 22 is located inside the outer sleeve 3. By setting the end of the second spiral oil groove 21 through the second end 22, impurities and particles on the outer peripheral wall of the central shaft 2 can be pushed to the second end 22 and discharged. The end of the second spiral oil groove 21 away from the second end 22 is located inside the outer sleeve 3 to ensure that the mating part between the central shaft 2 and the outer sleeve 3 has the passage of the second spiral oil groove 21, so as to ensure that the lubricating oil in the second spiral oil groove 21 can lubricate the mating part between the central shaft 2 and the outer sleeve 3. Of course, the end of the second spiral oil groove 21 away from the second end 22 can also directly penetrate the end of the central shaft 2 away from the second end 22 to facilitate the opening of the second spiral oil groove 21 of the central shaft 2.

[0043] Optionally, along the length of the inner shaft 1, the width of the first spiral oil groove 11 adjacent to the first end 12 is smaller than the width of the first spiral oil groove 11 away from the first end 12. In other words, the end of the inner shaft 1 away from the first end 12 is inserted into the middle shaft 2. During the operation of the inner shaft 1, the end of the inner shaft 1 away from the first end 12 experiences frequent friction. Therefore, the narrower width of the oil groove near the first end 12 of the inner shaft 1 can control the release of oil, making it less likely for lubricating oil to be wasted or leak excessively. The wider width of the oil groove can gradually provide more lubricating oil. As the groove width increases, the oil flow rate and lubrication capacity can be gradually enhanced to meet the operational coordination requirements between the inner shaft 1 and the middle shaft 2, improve the heat dissipation effect at the joint between the inner shaft 1 and the middle shaft 2, help maintain the normal operating temperature of the shaft, and prevent overheating from affecting the performance of the winding shaft. In other words, the oil flow rate can be adjusted according to the lubrication requirements of different areas, the lubrication effect can be improved, lubricating oil waste can be reduced, and the durability and heat dissipation performance of the shaft can be enhanced.

[0044] Furthermore, along the length of the central shaft 2, the width of the second spiral oil groove 21 near the second end 22 is smaller than the width of the second spiral oil groove 21 away from the second end 22. In other words, the end of the central shaft 2 away from the second end 22 is inserted into the outer sleeve 3. During the operation of the central shaft 2, the end of the central shaft 2 away from the second end 22 experiences frequent friction. Therefore, the narrower groove width near the second end 22 of the central shaft 2 can control the release of oil, making it less likely for lubricating oil to be wasted or leak excessively. The wider groove width can gradually provide more lubricating oil. As the groove width increases, the oil flow rate and lubrication capacity can be gradually enhanced to meet the operational coordination requirements between the central shaft 2 and the outer sleeve 3, improve the heat dissipation effect at the joint between the central shaft 2 and the outer sleeve 3, help maintain the normal operating temperature of the shaft, and prevent overheating from affecting the performance of the winding shaft. In other words, the overall oil flow rate can be adjusted according to the lubrication requirements of different areas, improving the lubrication effect, reducing lubricating oil waste, and enhancing the durability and heat dissipation performance of the shaft.

[0045] Preferably, along the length direction of the inner shaft 1, the groove depth of the first spiral oil groove 11 adjacent to the first end 12 is smaller than the groove depth of the first spiral oil groove 11 away from the first end 12. In other words, the groove depth of the oil groove adjacent to the first end 12 is shallower, which is conducive to the rapid distribution of lubricating oil in the initial stage and avoids the accumulation of lubricating oil. This allows the lubricating oil to be evenly distributed to the entire surface of the inner shaft 1, thereby providing a more effective lubrication effect. As the groove depth gradually increases, the lubricating oil can better form a film on the surface of the inner shaft 1, improve the lubrication performance, and reduce friction loss.

[0046] Furthermore, along the length of the central shaft 2, the groove depth of the second spiral oil groove 21 adjacent to the second end 22 is less than that of the second spiral oil groove 21 far from the second end 22. In other words, the groove depth of the oil groove adjacent to the second end 22 is shallower, which is conducive to the rapid distribution of lubricating oil in the initial stage and avoids the accumulation of lubricating oil. This allows the lubricating oil to be evenly distributed to the entire surface of the central shaft 2, thereby providing a more effective lubrication effect. As the groove depth gradually increases, the lubricating oil can better form a film on the surface of the central shaft 2, improve the lubrication performance, and reduce friction loss.

[0047] In some embodiments, the width of the first spiral oil groove 11 is D1, where 2mm ≤ D1 ≤ 4mm. For example, the width D1 of the first spiral oil groove 11 is 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. If the width of the first spiral oil groove 11 is too wide, it will affect the structural rigidity of the inner shaft 1. If the width of the first spiral oil groove 11 is too narrow, the lubrication effect will be poor and it will be difficult to remove impurities. The width of the first spiral oil groove 11 is moderate, and the lubrication effect is good. Similarly, the width of the second spiral oil groove 21 is D2, where 2mm ≤ D2 ≤ 4mm. For example, the width D2 of the second spiral oil groove 21 is 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. If the width of the second spiral oil groove 21 is too wide, it will affect the structural rigidity of the central shaft 2. If the width of the second spiral oil groove 21 is too narrow, the lubrication effect will be poor and it will be difficult to remove impurities. The width of the second spiral oil groove 21 is moderate, and the lubrication effect is good, while also ensuring the structural rigidity of the central shaft 2.

[0048] Furthermore, the groove depth of the first spiral oil groove 11 is H1, 0.5mm≤H1≤1mm. For example, the groove depth H1 of the first spiral oil groove 11 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. If the groove depth of the first spiral oil groove 11 is too shallow, the oil supply will be insufficient, resulting in insufficient lubrication, premature wear, and poor flow. If the groove depth of the first spiral oil groove 11 is too deep, the lubricating oil may remain in the groove too much, making it difficult for the lubricating oil to flow out of the groove, resulting in waste of lubricating oil. At the same time, it may prevent the lubricating oil from flowing quickly to the parts that need lubrication, resulting in energy loss and temperature rise. The groove depth of the first spiral oil groove 11 is moderate, the lubrication effect is good, and the lubricating oil flows smoothly.

[0049] Similarly, the groove depth of the second spiral oil groove 21 is H2, 0.5mm≤H2≤1mm. For example, the groove depth H2 of the second spiral oil groove 21 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. If the groove depth of the second spiral oil groove 21 is too shallow, the oil supply will be insufficient, resulting in insufficient lubrication, premature wear, and poor flow. If the groove depth of the second spiral oil groove 21 is too deep, the lubricating oil may remain in the groove too much, making it difficult for the lubricating oil to flow out of the groove, resulting in the waste of lubricating oil. At the same time, it may prevent the lubricating oil from flowing quickly to the parts that need lubrication, resulting in energy loss and temperature rise. The groove depth of the second spiral oil groove 21 is moderate, the lubrication effect is good, and the lubricating oil flows smoothly.

[0050] Optionally, the groove spacing of the first spiral oil groove 11 is P1, where 25mm ≤ P1 ≤ 35mm. For example, the groove spacing P1 of the first spiral oil groove 11 is 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, etc. If the groove spacing of the first spiral oil groove 11 is too small, the lubricating oil flow space will be narrowed, and the lubricating oil will not flow smoothly in the groove. This may prevent the lubricating oil from smoothly entering the area that needs lubrication, thereby affecting the lubrication effect. Moreover, if the groove spacing is too small, the lubricating oil cannot flow and be discharged quickly, which may cause the lubricating oil to accumulate in the groove. Aggregation can create unnecessary pressure, increase the residence time of lubricating oil, and reduce the circulation efficiency of lubricating oil. If the groove spacing is too large, the distribution of lubricating oil may be uneven, resulting in insufficient lubrication in some areas. Especially under high-speed operation conditions, the lubricating oil may flow away quickly and cannot stay in the area that needs lubrication for a long time, resulting in insufficient lubrication. In addition, if the groove spacing is too large, the lubricating oil may flow too fast and be carried away or lost, failing to maintain a sufficient oil film on the contact surface, which can easily lead to insufficient lubrication effect and increase friction and wear. The groove spacing of the first spiral oil groove 11 is moderate, the lubricating oil flows smoothly and is evenly distributed, and the lubrication effect is good.

[0051] Similarly, the groove spacing of the second spiral oil groove 21 is P2, where 25mm≤P2≤35mm. For example, the groove spacing P2 of the second spiral oil groove 21 is 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, etc. If the groove spacing of the second spiral oil groove 21 is too small, it will cause the lubricating oil flow space to narrow, and the lubricating oil will not flow smoothly in the groove, affecting the lubrication effect. If the groove spacing is too large, the distribution of lubricating oil may be uneven, resulting in insufficient lubrication in some areas. Especially under high-speed operation conditions, the lubricating oil may flow away quickly and cannot stay in the area that needs lubrication for a long time, resulting in insufficient lubrication. The groove spacing of the second spiral oil groove 21 is moderate, the lubricating oil flows smoothly and is evenly distributed, and the lubrication effect is good.

[0052] Furthermore, the bottom cross-section of the first spiral oil groove 11 is arc-shaped. Compared to a flat or acute-angled bottom, the arc-shaped bottom better guides the oil flow, ensuring a uniform flow velocity throughout the groove and preventing excessive or obstructed flow. It also facilitates the rolling of impurities and particles along the bottom, improving the smoothness and stability of their flow and reducing the likelihood of them getting stuck in the first spiral oil groove 11. Similarly, the bottom cross-section of the second spiral oil groove 21 can also be arc-shaped. This arc-shaped bottom structure facilitates the flow of lubricating oil within the second spiral oil groove 21 and also allows impurities and particles to roll along the bottom, improving their smoothness.

[0053] In other embodiments, the inner wall of the outer sleeve 3 is provided with a reinforcing oil groove. By providing an oil groove on the inner wall of the outer sleeve 3, the lubrication effect between the inner wall of the outer sleeve 3 and the outer peripheral wall of the central shaft 2 is improved, and the friction and wear between the central shaft 2 and the outer sleeve 3 are further reduced. The length of the reinforcing oil groove can extend along the length direction of the outer sleeve 3 so as to facilitate the opening of the reinforcing oil groove on the inner wall of the outer sleeve 3. Of course, the reinforcing oil groove can also be a spiral oil groove, which can further enhance the lubrication effect of the inner wall of the outer sleeve 3.

[0054] In addition, the inner wall of the central shaft 2 can also be provided with a reinforcing oil groove. Similarly, by providing an oil groove on the inner wall of the central shaft 2, the lubrication effect between the inner wall of the central shaft 2 and the outer peripheral wall of the inner shaft 1 can be improved, further reducing the friction and wear between the central shaft 2 and the inner shaft 1. The length of the reinforcing oil groove can extend along the length direction of the central shaft 2 so as to facilitate the opening of the reinforcing oil groove on the inner wall of the central shaft 2.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery winding shaft, characterized in that, It includes an inner shaft (1), a middle shaft (2) and an outer sleeve (3). The inner shaft (1) is movably disposed within the middle shaft (2), and the middle shaft (2) is movably disposed within the outer sleeve (3). The outer sleeve (3) has a first axis. Both the inner shaft (1) and the middle shaft (2) can rotate around the first axis. The outer peripheral wall of the inner shaft (1) is provided with at least one first spiral oil groove (11). The first spiral oil groove (11) is spirally arranged around the first axis.

2. The battery winding shaft according to claim 1, characterized in that, The inner shaft (1) has a first end (12) exposed above the central shaft (2), the first spiral oil groove (11) extending at least through the first end (12), and the end of the first spiral oil groove (11) away from the first end (12) located inside the central shaft (2); and / or, Along the length direction of the inner shaft (1), the groove width of the first spiral oil groove (11) adjacent to the first end (12) is smaller than the groove width of the first spiral oil groove (11) away from the first end (12); and / or, Along the length direction of the inner shaft (1), the groove depth of the first spiral oil groove (11) adjacent to the first end (12) is less than the groove depth of the first spiral oil groove (11) away from the first end (12).

3. The battery winding shaft according to claim 1, characterized in that, The width of the first spiral oil groove (11) is D1, 2mm≤D1≤4mm; and / or, The groove depth of the first spiral oil groove (11) is H1, 0.5mm≤H1≤1mm; and / or, The groove spacing of the first spiral oil groove (11) is P1, 25mm≤P1≤35mm.

4. The battery winding shaft according to any one of claims 1-3, characterized in that, The outer peripheral wall of the central shaft (2) is provided with at least one second spiral oil groove (21), which is arranged in a spiral shape around the first axis.

5. The battery winding shaft according to claim 4, characterized in that, The central shaft (2) has a second end (22) exposed outside the outer sleeve (3), the second spiral oil groove (21) extending at least through the second end (22), and the end of the second spiral oil groove (21) away from the second end (22) located inside the outer sleeve (3); and / or, Along the length direction of the central axis (2), the groove width of the second spiral oil groove (21) adjacent to the second end (22) is smaller than the groove width of the second spiral oil groove (21) away from the second end (22); and / or, Along the length direction of the central axis (2), the groove depth of the second spiral oil groove (21) adjacent to the second end (22) is less than the groove depth of the second spiral oil groove (21) away from the second end (22).

6. The battery winding shaft according to claim 4, characterized in that, The width of the second spiral oil groove (21) is D2, 2mm≤D2≤4mm; and / or, The depth of the second spiral oil groove (21) is H2, 0.5mm≤H2≤1mm; and / or, The groove spacing of the second spiral oil groove (21) is P2, 25mm≤P2≤35mm.

7. The battery winding shaft according to claim 4, characterized in that, The bottom cross section of the first spiral oil groove (11) and / or the second spiral oil groove (21) is arc-shaped.

8. The battery winding shaft according to any one of claims 1-3, characterized in that, The outer peripheral wall of the central shaft (2) is provided with a plurality of oil guide holes, which can communicate with the first spiral oil groove (11).

9. The battery winding shaft according to claim 8, characterized in that, Multiple sets of oil guide holes are provided at intervals on the outer peripheral wall of the central axis (2) along the length of the central axis (2). Each set of oil guide holes includes multiple oil guide holes, and all the oil guide holes in the oil guide hole set are evenly distributed around the first axis.

10. The battery winding shaft according to any one of claims 1-3, characterized in that, The inner wall of the outer jacket (3) and / or the inner wall of the central shaft (2) are provided with reinforcing oil grooves.

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