Shell assembly and battery
By designing the gradually expanded shell assembly, the problem of angle deviation of the roll core into the shell is solved, the shell yield and production efficiency are improved, and the manufacturing cost is reduced.
Patent Information
- Application Number
- CN202420475739.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-03-12
AI Technical Summary
In existing buckle batteries, the angle deviation of the inlet angle is prone to occur when the core is rolled into the shell, which increases the difficulty of inlet, decreases the yield, and may lead to equipment abnormalities and increase manufacturing costs.
A housing assembly is designed, including a bottom cover and an accommodating cylinder with both ends opened. The diameter of the inner wall of the housing cylinder increases in a direction away from the bottom cover to form a gradually expanded shell, increasing the tolerance range of the inlet angle deviation, and guiding the core into the shell through the smooth inner wall.
The yield of the rolled core into the shell is improved, manufacturing costs are reduced, and production efficiency is improved.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the field of lithium batteries, in particular to a shell component and a battery. Background Art
[0002] In existing button batteries, there is often some deviation in the angle of the core when it is inserted into the shell. The larger the diameter of the core, the smaller the deviation of the angle is required, otherwise it will be difficult to insert into the shell. In order to increase the energy density of the battery, the size of the core is designed to be larger and larger, making the diameter of the core closer to the diameter of the battery shell, which makes it more difficult to insert the core into the shell, resulting in a decrease in the yield of the core entering the shell, and it is easy to cause equipment abnormalities and increase manufacturing costs. Utility Model Content
[0003] The embodiments of the utility model provide a shell assembly and a battery to solve the problem of difficulty in inserting the shell due to the increase in the size of the winding core, thereby improving the yield rate of inserting the winding core into the shell and reducing the manufacturing cost.
[0004] Specifically, the utility model provides a shell assembly, including a bottom cover and a accommodating tube with openings at both ends, wherein the bottom cover is closed and connected to one opening of the accommodating tube to form a shell with an opening at one end; the inner wall of the accommodating tube is a smooth surface, and the diameter of the inner wall of the accommodating tube increases gradually along the direction away from the bottom cover.
[0005] Optionally, a plane parallel to the axial direction of the accommodating tube is taken as a longitudinal section;
[0006] The projection of the inner wall of the accommodating tube on the longitudinal section is a straight line segment or a curved line segment; or, the projection of the inner wall of the accommodating tube on the longitudinal section includes straight line segments and curved line segments that are smoothly connected in sequence.
[0007] Optionally, an angle between an inner wall of the accommodating tube and an axis of the accommodating tube is 0.5° to 1°.
[0008] Optionally, a difference between a diameter of an end of the accommodating tube away from the bottom cover and a diameter of an end of the accommodating tube close to the bottom cover is 0.05 to 0.1 mm.
[0009] Optionally, the height of the shell is 3 to 8 mm; and / or the thickness of the accommodating tube is 0.08 to 0.15 mm.
[0010] Optionally, the shell assembly further includes a top cover, which seals the opening of the shell.
[0011] Optionally, the shell assembly further includes a first insulating layer, which is disposed on the top cover and located inside the shell.
[0012] Optionally, the top cover includes a first cover body, a second insulating layer and a second cover body, the first cover body, the second insulating layer and the second cover body are stacked, the first cover body is connected to one end of the accommodating tube away from the bottom cover, and the first insulating layer is arranged on a side of the first cover body away from the second insulating layer.
[0013] Optionally, a through hole is provided on the first cover body, a protrusion is provided on the second cover body, and the protrusion is located in the through hole; the inner edge of the first insulating layer extends between the protrusion and the inner wall of the through hole.
[0014] The utility model also provides a battery, comprising a winding core and a shell assembly as described in any one of the above items, wherein the winding core is arranged in the shell.
[0015] The beneficial effects of the utility model are:
[0016] In the shell assembly and battery provided by the utility model, since the diameter of the inner wall of the accommodating tube increases in the direction away from the bottom cover, the opening diameter of the shell is larger than the bottom diameter, and is gradually expanded, thereby making the gap between the core and the shell opening larger, and the acceptable shell entry angle deviation larger, which is conducive to the core entering the shell, thereby improving the yield of the core entering the shell and reducing the manufacturing cost. In addition, since the inner wall of the accommodating tube is a smooth surface, the core can be guided to slide from the shell opening into the shell when the core enters the shell, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 It is a schematic projection diagram of the housing assembly in the longitudinal section in the first embodiment of the utility model;
[0019] Figure 2 It is a schematic cross-sectional view of a battery in the first embodiment of the utility model.
[0020] In the figure: 100, housing, 110, bottom cover, 120, accommodating tube, 200, top cover, 210, first cover body, 211, through hole, 220, second insulating layer, 230, second cover body, 231, protrusion, 300, first insulating layer, 400, winding core;
[0021] r. The angle between the inner wall of the containing tube and the preset straight line. DETAILED DESCRIPTION
[0022] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0025] Figure 1 Schematic projection diagram of the housing assembly in the longitudinal section of the first embodiment of the utility model, as shown in FIG. Figure 1 As shown, and refer to Figure 2 An embodiment of the utility model provides a shell assembly, including a bottom cover 110 and a receiving tube 120 with openings at both ends, wherein the bottom cover 110 is closed and connected to an opening of the receiving tube 120 to form a shell 100 with an opening at one end; the inner wall of the receiving tube 120 is a smooth surface, and the diameter of the inner wall of the receiving tube 120 increases gradually along the direction away from the bottom cover 110.
[0026] In the embodiment of the utility model, since the diameter of the inner wall of the accommodating tube 120 increases in the direction away from the bottom cover 110, the opening diameter of the shell 100 is larger than the bottom diameter, and is gradually expanded, thereby making the gap between the core 400 and the opening of the shell 100 larger, and the acceptable shell entry angle deviation larger, which is conducive to the core 400 entering the shell, thereby improving the yield of the core 400 entering the shell and reducing the manufacturing cost. In addition, since the inner wall of the accommodating tube 120 is a smooth surface, when the core 400 enters the shell, it can guide the core 400 to slide from the opening of the shell 100 into the shell 100, thereby improving production efficiency.
[0027] In one embodiment of the present invention, a plane parallel to the axial direction of the accommodating tube 120 is a longitudinal section. The projection of the inner wall of the accommodating tube 120 on the longitudinal section is a straight line segment or a curved line segment; or, the projection of the inner wall of the accommodating tube 120 on the longitudinal section includes a straight line segment and a curved line segment that are smoothly connected in sequence. The present embodiment of the present invention provides a variety of shapes and structures of the inner wall of the accommodating tube 120 to be suitable for batteries with different requirements.
[0028] like Figure 1 As shown, in one embodiment of the present invention, the angle between the inner wall of the accommodating tube 120 and the axis of the accommodating tube 120 is 0.5° to 1°; that is, in the longitudinal section of the shell assembly, the extension line of the axis of the accommodating tube 120 intersects with the extension line of the inner wall of the accommodating tube 120, and the angle is 0.5° to 1°; similarly, in the longitudinal section of the shell assembly, the preset straight line with the axis of the accommodating tube 120 intersects with the inner wall of the accommodating tube 120, so that the angle r between the preset straight line and the inner wall of the accommodating tube 120 is 0.5° to 1°. If the angle between the inner wall of the accommodating tube 120 and the bottom cover 110 is too large, the gap between the upper half of the shell 100 and the winding core 400 will be too large, and the winding core 400 will easily shake. If the angle between the inner wall of the accommodating tube 120 and the bottom cover 110 is too small, the effect of improving the yield rate of the winding core 400 into the shell is not obvious.
[0029] Furthermore, the difference between the diameter of the end of the accommodating tube 120 away from the bottom cover 110 and the diameter of the end of the accommodating tube 120 close to the bottom cover 110 is 0.05 to 0.1 mm. In addition, the height of the shell 100 is 3 to 8 mm. This arrangement can not only avoid the gap between the upper half of the shell 100 and the winding core 400 being too large, but also significantly improve the yield rate of the winding core 400 entering the shell.
[0030] In one embodiment of the present invention, the wall thickness of the accommodating tube 120 is uniformly set to facilitate stamping processing. Further, the thickness of the accommodating tube 120 is 0.08 to 0.15 mm.
[0031] In one embodiment of the present invention, the housing 100 formed by connecting the bottom cover 110 and the accommodating tube 120 is integrally formed by stamping.
[0032] In an embodiment of the present invention, the housing assembly further includes a top cover 200 , and the top cover 200 covers the opening of the housing 100 to form a sealed housing 100 structure.
[0033] Furthermore, the housing assembly further includes a first insulating layer 300, which is disposed on the top cover 200 and is located inside the housing 100. The first insulating layer 300 can prevent the top cover 200 from being electrically connected to the winding core 400, thereby preventing a short circuit in the battery.
[0034] In one embodiment of the utility model, the top cover 200 includes a first cover body 210, a second insulating layer 220 and a second cover body 230, the first cover body 210, the second insulating layer 220 and the second cover body 230 are stacked, the first cover body 210 is connected to one end of the accommodating tube 120 away from the bottom cover 110, and the first insulating layer 300 is arranged on the first cover body 210.
[0035] In the embodiment of the utility model, the first cover body 210, the second insulating layer 220 and the second cover body 230 are stacked and hot-pressed to form a top cover, and the overall strength is high. After the core 400 is put into the shell, the pole ear of one polarity is connected to the bottom cover 110, so the accommodating tube 120 and the first cover body 210 connected to the bottom cover 110 are at the same polarity. The pole ear of the other polarity is connected to the second cover body 230. The setting of the first insulating layer 300 can prevent the pole ear of the other polarity from contacting the first cover body 210 and avoiding battery short circuit; the setting of the second insulating layer 220 can prevent the second cover body 230 from contacting the first cover body 210 and avoiding battery short circuit.
[0036] In one embodiment of the utility model, a through hole 211 is provided on the first cover body 210, and a protrusion 231 is provided on the second cover body 230, and the protrusion 231 is located in the through hole 211; the inner edge of the first insulating layer 300 extends between the protrusion 231 and the inner wall of the through hole 211, so as to insulate the first cover body 210 from the second cover body 230.
[0037] like Figure 2 As shown, the utility model also provides a battery, including a winding core 400 and a shell assembly as in any of the above embodiments, so as to have all the effects of the shell assembly. The winding core 400 is arranged in the shell 100. A pole ear of one polarity of the winding core 400 is connected to the bottom cover 110, and a pole ear of the other polarity is connected to the protrusion 231.
[0038] When preparing the battery provided by the embodiment of the utility model, the first cover 210, the second insulating layer 220 and the second cover 230 are heat-pressed and laminated, and the first insulating layer 300 is applied to the side of the first cover 210 away from the second insulating layer 220. The winding core 400 is placed in the shell 100, and the tabs of the winding core 400 are connected to the shell 100 and the second cover 230 by laser welding, resistance welding, ultrasonic welding, etc. Then the assembled winding core 400 is baked and injected; after the injection is completed, the first cover is welded to the shell 100 by laser welding to seal it.
[0039] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.
Claims
1. A housing assembly, characterized in that: It comprises a bottom cover and a receiving tube with openings at both ends, wherein the bottom cover is closed and connected to one opening of the receiving tube to form a shell with an opening at one end; the inner wall of the receiving tube is a smooth surface, and the diameter of the inner wall of the receiving tube increases gradually in the direction away from the bottom cover.
2. The housing assembly according to claim 1, characterized in that: A plane parallel to the axial direction of the accommodating tube is taken as a longitudinal section; The projection of the inner wall of the accommodating tube on the longitudinal section is a straight line segment or a curved line segment; or, the projection of the inner wall of the accommodating tube on the longitudinal section includes straight line segments and curved line segments that are smoothly connected in sequence.
3. The housing assembly according to claim 1, characterized in that: The angle between the inner wall of the accommodating tube and the axis of the accommodating tube is 0.5° to 1°.
4. The housing assembly according to claim 1, characterized in that: A difference between a diameter of an end of the accommodating tube away from the bottom cover and a diameter of an end of the accommodating tube close to the bottom cover is 0.05 to 0.1 mm.
5. The housing assembly according to claim 2, characterized in that: The height of the shell is 3 to 8 mm; and / or the thickness of the accommodating tube is 0.08 to 0.15 mm.
6. The housing assembly according to claim 1, characterized in that: The housing assembly further includes a top cover, which seals the opening of the housing.
7. The housing assembly according to claim 6, characterized in that: The housing assembly further includes a first insulating layer, which is disposed on the top cover and is located inside the housing.
8. The housing assembly according to claim 7, characterized in that: The top cover includes a first cover body, a second insulating layer and a second cover body, the first cover body, the second insulating layer and the second cover body are stacked, the first cover body is connected to an end of the accommodating tube away from the bottom cover, and the first insulating layer is arranged on a side of the first cover body away from the second insulating layer.
9. The housing assembly according to claim 8, characterized in that: The first cover body is provided with a through hole, the second cover body is provided with a protrusion, and the protrusion is located in the through hole; the inner edge of the first insulating layer extends between the protrusion and the inner wall of the through hole.
10. A battery, characterized in that: It comprises a winding core and a shell assembly as claimed in any one of claims 1 to 9, wherein the winding core is arranged in the shell.