Shell assembly and battery
By splitting the traditional cover structure into the first cover plate and the second cover plate, and combining the design of the pole block, the problem of low battery energy density caused by large cover plate flip space is solved, and a higher energy density is achieved and more stable sealing.
Patent Information
- Application Number
- CN202420224426.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-01-30
AI Technical Summary
In existing battery installations, the battery energy density is low due to the large overturning space of the cover.
By splitting the traditional cover structure into the first cover plate and the second cover plate, and combining the design of the pole block, the pole ear welding can be completed by simply turning the pole block with a smaller flip area, reducing the cover plate flip Space demand.
The energy density of the battery is increased, and the stability of the seal is improved by increasing the contact surface between the second cover plate and the first cover plate.
Smart Images
Figure CN222440714U_ABST
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] Existing battery installation usually requires placing the battery cell in the shell assembly, welding the battery cell's tabs to the cover plate, and then welding the cover plate and the shell assembly together. During actual welding, the cover plate and the shell assembly need to be flipped at a certain angle to expose the welding surface, and the tabs need to be welded. After welding, the cover plate needs to be flipped again to cover the opening of the shell assembly and welded together. This welding method requires reserving a longer tab to meet the flipping requirements of the cover plate. However, the longer the tab is, the higher the risk of short circuit. At the same time, a larger space needs to be reserved for the tab in the shell assembly, resulting in a decrease in energy density. Utility Model Content
[0003] The embodiment of the utility model provides a shell assembly and a battery to solve the problem of low battery energy density caused by large cover flipping space.
[0004] Specifically, the utility model provides a housing assembly, comprising a housing and a cover assembly, wherein at least one end of the housing is provided with an opening, and the cover assembly is used to close the opening;
[0005] The cover plate assembly comprises: a first cover plate and a pole block, the first cover plate is provided with a mounting hole, and the pole block is embedded in the mounting hole;
[0006] The pole block includes a second cover plate, an insulating layer and a pole, the second cover plate is overlapped on the inner wall of the mounting hole, a first through hole is provided on the second cover plate, the pole is inserted into the first through hole, and the insulating layer is arranged between the second cover plate and the pole.
[0007] Optionally, the mounting hole is a stepped hole;
[0008] The outer edge of the second cover plate overlaps the step of the stepped hole; or, the outer edge of the second cover plate is provided with a protrusion, and the protrusion overlaps the step of the stepped hole.
[0009] Optionally, a first guiding bevel is provided on the outer wall of the mounting hole, a second guiding bevel is provided on the outer edge of the second cover plate, the second guiding bevel is provided on a side of the second cover plate facing the mounting hole, and the first guiding bevel is in contact with the second guiding bevel.
[0010] Optionally, the second cover plate is welded to the first cover plate.
[0011] Optionally, the pole block further includes a pole connecting piece, the pole connecting piece is located in the shell and connected to the pole, and the pole connecting piece is used to connect a pole lug.
[0012] Optionally, the pole block further includes a pole plate, which is arranged on a side of the pole away from the pole connecting plate; a second through hole is provided on the pole plate at a position corresponding to the first through hole, and the pole passes through the second through hole and is connected to the pole plate.
[0013] Optionally, the insulating layer includes a first insulating portion and a second insulating portion, the insulating portion is sleeved on the pole; the second insulating portion is connected to the insulating portion and is located between the second cover plate and the pole plate.
[0014] Optionally, the number of the first through holes is not less than two; the number of the poles is the same as the number of the first through holes, and the poles are inserted into the first through holes one by one.
[0015] The utility model also provides a battery, comprising a battery core and the shell assembly as described above, wherein the battery core is located in the shell assembly.
[0016] The beneficial effects of the utility model are:
[0017] In the shell assembly and battery provided by the utility model, by splitting the traditional cover plate structure into the first cover plate and the second cover plate, compared with the existing battery cell cover plate structure, when performing the pole ear welding operation, the first cover plate can be pre-welded in the cover plate assembly of the utility model, and only the pole block with a smaller area needs to be flipped, and the flipping space required for the pole block with a smaller area is much smaller than the flipping space required for the first cover plate, so only a small space needs to be reserved for the pole ear, thereby improving the energy density of the battery. At the same time, since the second cover plate is overlapped on the mounting hole, the contact surface between the second cover plate and the first cover plate can be increased, and the sealing stability of the second cover plate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] 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.
[0019] Figure 1 It is a schematic structural diagram of a pole block in a cover plate assembly in an embodiment of the utility model;
[0020] Figure 2 is a schematic structural diagram of a housing assembly in one embodiment of the utility model;
[0021] Figure 3 It is a schematic cross-sectional view of a battery in one embodiment of the utility model.
[0022] In the figure: 100, shell, 110, opening, 200, first cover plate, 210, mounting hole, 300, pole block, 310, second cover plate, 311, first through hole, 312, protrusion, 320, insulating layer, 321, first insulating portion, 322, second insulating portion, 323, extension portion, 330, pole, 340, pole connecting piece, 350, pole plate, 351, second through hole, 400, battery cell, 500, pole ear. DETAILED DESCRIPTION
[0023] 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.
[0024] 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.
[0025] 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.
[0026] Figure 1 Schematic diagram of the structure of the pole block in the cover assembly in one embodiment of the utility model, such as Figure 1 As shown, and refer to Figures 2 to 3The embodiment of the utility model provides a cover plate assembly, including a first cover plate 200 and a pole block 300, wherein the first cover plate 200 is provided with a mounting hole 210, and the pole block 300 is embedded in the mounting hole 210. The pole block 300 includes a second cover plate 310, an insulating layer 320 and a pole 330, wherein the second cover plate 310 is overlapped on the inner wall of the mounting hole 210, the second cover plate 310 is provided with a first through hole 311, the pole 330 is inserted into the first through hole 311, and the insulating layer 320 is provided between the second cover plate 310 and the pole 330.
[0027] In the embodiment of the utility model, by splitting the traditional cover plate structure into the first cover plate 200 and the second cover plate 310, when performing the welding operation of the pole lug 500, the first cover plate 200 can be pre-welded, and only the pole block 300 with a smaller area needs to be flipped, and the flipping space required for the pole block 300 with a smaller area is much smaller than the flipping space required for the first cover plate 200, so only a small space needs to be reserved for the pole lug 500, thereby improving the energy density of the battery. At the same time, since the second cover plate 310 is overlapped on the mounting hole 210, the contact surface between the second cover plate 310 and the first cover plate 200 can be increased, and the sealing stability of the second cover plate 310 can be improved.
[0028] Specifically, the mounting hole 210 is a stepped hole, and the outer edge of the second cover plate 310 overlaps the step of the stepped hole. In this way, the second cover plate 310 can be directly mounted in the stepped hole, which is easy to operate.
[0029] In an alternative embodiment of the present invention, a protrusion 312 is provided on the outer edge of the second cover plate 310, and the protrusion 312 overlaps the step of the stepped hole. This arrangement can increase the contact surface between the second cover plate 310 and the first cover plate 200, and further improve the sealing stability of the second cover plate 310.
[0030] In an alternative embodiment of the utility model, the outer wall of the mounting hole is provided with a first guiding bevel, the outer edge of the second cover plate is provided with a second guiding bevel, the second guiding bevel is provided on the side of the second cover plate facing the mounting hole, and the first guiding bevel is in contact with the second guiding bevel. With this arrangement, the second cover plate can be installed on the first cover plate without precise alignment, which effectively improves production efficiency.
[0031] In an embodiment of the present invention, the second cover plate 310 is welded to the first cover plate 200 by laser welding to ensure the sealing stability of the second cover plate 310 .
[0032] In an embodiment of the present invention, both ends of the housing 100 are provided with openings 110 , and the first cover plate 200 is disposed in one-to-one correspondence with the openings 110 , so that the positive and negative tabs 500 can be welded through the two openings 110 , respectively.
[0033] Specifically, the pole block 300 further includes a pole connecting piece 340, which is located in the housing 100 and connected to the pole 330. The pole connecting piece 340 is used to connect the pole lug 500. The present application directly welds the pole lug 500 to the pole 330 through the pole connecting piece 340, thereby saving an intermediate connecting piece or a transfer piece and material cost.
[0034] In one embodiment of the utility model, the pole block 300 also includes a pole plate 350, which is arranged on the side of the pole 330 away from the pole connecting plate 340; a second through hole 351 is provided on the pole plate 350 at a position corresponding to the first through hole 311, and the pole 330 passes through the second through hole 351 and is connected to the pole plate 350.
[0035] In the embodiment of the utility model, a pole plate 350 is provided outside the shell 100, and the pole plate 350 is connected to the pole 330. When used, the external circuit is connected to the pole plate 350 to avoid affecting the pole 330 and the pole ear 500 when connecting the external circuit, thereby improving the service life of the battery.
[0036] In an embodiment of the utility model, the insulating layer 320 includes a first insulating portion 321 and a second insulating portion 322, wherein the insulating portion is sleeved on the pole 330 and is located between the pole 330 and the second cover plate 310; the second insulating portion 322 is connected to the insulating portion and is located between the second cover plate 310 and the pole plate 350. The first insulating portion 321, the second insulating portion 322 and the extension portion 323 are integrally formed by injection molding, and the first insulating portion 321 is used to isolate the pole 330 from contacting the second cover plate 310 to provide insulation between the two; the second insulating portion 322 is used to isolate the pole plate 350 from contacting the second cover plate 310 to provide insulation between the two.
[0037] In one embodiment of the utility model, the insulating layer 320 also includes an extension portion 323, which is connected to the second insulating portion 322 and is sleeved on the pole plate 350. The second insulating portion 322 is used to isolate the contact between the pole plate 350 and the second cover plate 310 to play an insulating role between the two.
[0038] In an embodiment of the present invention, the number of the first through holes 311 is not less than two; the number of the poles 330 is the same as the number of the first through holes 311 , and the poles 330 are inserted into the first through holes 311 in a one-to-one correspondence.
[0039] Specifically, in the present invention, two, three or four first through holes 311 are provided on the second cover plate 310 , and a pole 330 is provided in each first through hole 311 .
[0040] In a preferred embodiment, the second cover plate 310 of the utility model is provided with two first through holes 311, and the poles 330 are provided with two poles 330, which are correspondingly inserted into the first through holes 311. The utility model splits a large pole 330 into two small poles 330, thereby ensuring the current capacity while reducing the volume of the pole 330, reducing the material consumption of the pole 330, and reducing the cost.
[0041] like Figure 2 As shown, the utility model also provides a housing assembly, including a housing 100 and a cover assembly in any of the above embodiments, so as to have all the effects of the cover assembly. The housing 100 is provided with an opening 110 at at least one end, and the cover assembly is used to close the opening 110.
[0042] The utility model further provides a battery, comprising a battery cell 400 and a shell assembly as in any one of the above embodiments, so as to have all the effects of the shell assembly; the battery cell 400 is located in the shell assembly.
[0043] like Figure 3 As shown, in one embodiment of the present invention, a pole tab 500 is provided at the end of the battery cell 400 , and the pole tab 500 is welded to the pole connecting piece 340 .
[0044] 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 shell and a cover assembly, wherein at least one end of the shell is provided with an opening, and the cover assembly is used to close the opening; The cover plate assembly comprises: a first cover plate and a pole block, the first cover plate is provided with a mounting hole, and the pole block is embedded in the mounting hole; The pole block includes a second cover plate, an insulating layer and a pole, the second cover plate is overlapped on the inner wall of the mounting hole, a first through hole is provided on the second cover plate, the pole is inserted into the first through hole, and the insulating layer is arranged between the second cover plate and the pole.
2. The housing assembly according to claim 1, characterized in that: The mounting hole is a stepped hole; The outer edge of the second cover plate overlaps the step of the stepped hole; or, the outer edge of the second cover plate is provided with a protrusion, and the protrusion overlaps the step of the stepped hole.
3. The housing assembly according to claim 1, characterized in that: The outer wall of the mounting hole is provided with a first guiding bevel, the outer edge of the second cover plate is provided with a second guiding bevel, the second guiding bevel is arranged on a side of the second cover plate facing the mounting hole, and the first guiding bevel is in contact with the second guiding bevel.
4. The housing assembly according to claim 1, characterized in that: The second cover plate is welded to the first cover plate.
5. The housing assembly according to claim 1, characterized in that: The pole block further includes a pole connecting piece, which is located in the shell and connected to the pole, and is used to connect a pole ear.
6. The housing assembly according to claim 5, characterized in that: The pole block further includes a pole plate, which is arranged on a side of the pole away from the pole connecting plate; a second through hole is arranged on the pole plate at a position corresponding to the first through hole, and the pole passes through the second through hole and is connected to the pole plate.
7. The housing assembly according to claim 6, characterized in that: The insulating layer includes a first insulating portion and a second insulating portion, wherein the insulating portion is sleeved on the pole; the second insulating portion is connected to the insulating portion and is located between the second cover plate and the pole plate.
8. The housing assembly according to claim 1, characterized in that: The number of the first through holes is not less than two; the number of the poles is the same as the number of the first through holes, and the poles are inserted into the first through holes in a one-to-one correspondence.
9. A battery, characterized in that: It comprises a battery core and a shell assembly as described in any one of claims 1 to 8, wherein the battery core is located in the shell.