CN115719848A - Battery top cover structure, assembling method and battery - Google Patents
Battery top cover structure, assembling method and battery Download PDFInfo
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- CN115719848A CN115719848A CN202211418612.3A CN202211418612A CN115719848A CN 115719848 A CN115719848 A CN 115719848A CN 202211418612 A CN202211418612 A CN 202211418612A CN 115719848 A CN115719848 A CN 115719848A
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- aluminum plate
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 85
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000002991 molded plastic Substances 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 239000004033 plastic Substances 0.000 claims description 30
- 229920003023 plastic Polymers 0.000 claims description 30
- 229920001973 fluoroelastomer Polymers 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims 2
- 235000015110 jellies Nutrition 0.000 claims 1
- 239000008274 jelly Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 238000001746 injection moulding Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a battery top cover structure, an assembling method and a battery, wherein the battery top cover structure comprises: the cathode top cover (1), the cathode top cover (1) at least comprises a cathode pole (101), an aluminum plate (104) and injection-molded plastic (102); the middle part of the aluminum plate (104) is provided with a flanging structure (1041), and the notch structure (1042) surrounds the flanging structure (1041); the negative pole column (101) comprises a disc structure (1012) and a cylinder arranged on the disc structure (1012), and a groove cutting structure (1011) is formed on a cylindrical surface (1013) on the outer side of the cylinder; the notch structure (1042) is used for fixing injection-molded plastic (102), and the notch structure (1011) fixes the negative pole post (101) through the injection-molded plastic (102) to limit the negative pole post (101).
Description
Technical Field
The invention belongs to the technical field of design of a lithium battery cell structure, and particularly relates to a battery top cover structure, an assembling method and a battery.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The cylindrical lithium battery top cover is mostly of a traditional riveting structure, the assembly process is complex, the number of parts is large, the cost is high, the space occupancy rate of the lithium battery is large, and the energy density and the capacity of the lithium battery are influenced.
The cover plate structure of the lithium battery in the prior art comprises a positive pole, a conducting plate, a top cover plate and a plastic cover plate, wherein the conducting plate is connected with the positive pole, the positive pole is assembled with the top cover plate in an insulation mode, and the plastic cover plate is connected with the top cover plate.
The cover plate structure is lack of a related limiting mechanism, so that the structural stability of the top cover or the cover plate cannot be guaranteed.
Disclosure of Invention
The invention aims to solve the problems and provides a battery top cover structure and a battery.
According to some embodiments, the invention adopts the following technical scheme:
in a first aspect, a battery top cover structure is disclosed, comprising: the cathode top cover (1), the cathode top cover (1) at least comprises a cathode pole (101), an aluminum plate (104) and injection-molded plastic (102);
the middle part of the aluminum plate (104) is provided with a flanging structure (1041), and the notch structure (1042) surrounds the flanging structure (1041);
the negative pole post (101) comprises a disc structure (1012) and a cylinder arranged on the disc structure (1012), and a grooving structure (1011) is arranged on a cylindrical surface (1013) on the outer side of the cylinder;
the notch structure (1042) is used for fixing injection-molded plastic (102), and the notch structure (1011) fixes the negative pole post (101) through the injection-molded plastic (102) to limit the negative pole post (101).
As a further technical scheme, the grooving structure (1011) is a plurality of grooves which are uniformly or non-uniformly arranged on the cylindrical surface (1013) of the negative pole post (101).
As a more preferable aspect, the depth (H1) of the recessed groove structure (1011) has a value range of: h1 is more than 0 and less than or equal to 2mm, and the value range of the height (L1) of the grooving structure (1011) is as follows: l1 is more than 0 and less than or equal to 4mm.
As a further preferable technical solution, the section of the slot 1011 on the cylindrical surface 1013 is a plane, a concave surface or a triangle.
As a further technical scheme, the negative electrode top cover (1) further comprises fluororubber (103) and lower plastic (105);
the lower plastic (105) and the fluororubber (103) are respectively sleeved on the negative electrode pole (101), the fluororubber (103) is pressed on the upper surface of the disc structure (1012) except the mounting cylinder, and the aluminum plate (104) is used for pressing on the fluororubber (103).
As a further technical scheme, the flanging structure (1041) is formed by stamping and bending an aluminum plate base material and is integrated with the aluminum plate (104).
As a further technical scheme, the thickness of the aluminum base material of the aluminum plate (104) used for arranging the flanging structure (1041) is different from that of the aluminum base material on the periphery of the middle part, and a gap exists between the flanging structure (1041) and the aluminum base material on the periphery of the middle part to form a notch.
As a further preferred technical scheme, the thickness of the aluminum plate base material of the middle part for arranging the flanging structure (1041) is lower than that of the aluminum plate base material of the periphery of the middle part.
As a further preferred technical solution, the value range of the thickness (D2) of the flanging structure (1041) is: d2 is more than or equal to 0.5 and less than or equal to 2.5mm.
As a further preferred technical solution, the value range of the depth (L3) of the notch is: l3 is more than 0 and less than or equal to 2mm.
As a further preferred technical scheme, the value range of the distance L2 from the flanging structure (1041) to the aluminum plate main body is as follows: l2 is more than 0 and less than or equal to 4mm.
As a further preferable technical solution, a relation between the thickness (D2) of the flanging structure (1041) and the thickness D1 of the aluminum plate base material at the periphery of the middle portion is as follows: D2/D1 is more than or equal to 0.2 and less than 1.
In a second aspect, a method of assembling a battery top cap structure is disclosed, comprising:
sleeving a lower plastic (105) and fluororubber (103) on the cathode pole (101);
pressing the aluminum plate (104) on the fluororubber (103), extruding through a die to ensure the compression amount of the fluororubber (103), and simultaneously injecting plastic (102) on the assembled components in the die;
when plastic (102) is injected into the assembly, the notch structure (1041) of the aluminum plate (104) and the grooving structure (1011) of the negative pole post (101) respectively limit the aluminum plate (104) and the negative pole post (101) in the radial direction and the axial direction.
In a third aspect, a battery is disclosed, which comprises a battery top cover structure, an aluminum shell (2), a negative current collector (3), a roll core (4) and a positive current collector (5);
the battery top cover structure comprises a negative electrode top cover (1), wherein the negative electrode top cover (1) is electrically connected with a negative electrode current collector (3), the negative electrode current collector (3) and a positive electrode current collector (5) are electrically connected with a roll core (4), and the positive electrode current collector (5) is electrically connected with an aluminum shell (2) simultaneously.
As a further technical scheme, the aluminum plate (104) of the negative electrode top cover (1) is electrically connected with the aluminum shell (2).
Compared with the prior art, the invention has the following beneficial effects:
when the cathode top cover is assembled, the lower plastic and the fluororubber are sleeved on the cathode pole, the aluminum plate is pressed on the fluororubber, the compression amount of the fluororubber is guaranteed through extrusion of the mold, meanwhile, the plastic is injected into the mold, the cathode pole is provided with the groove cutting structure, the structural strength of the top cover can be greatly enhanced after the injected plastic is dissolved into the groove cutting structure, the radial and axial movement and rotation of the cathode pole are limited, and the structural strength can be realized after the injected plastic is cooled.
According to the invention, due to the notch characteristics of the aluminum plate and the grooving structure of the negative electrode post, when plastic is injected into the assembly, the aluminum plate and the negative electrode post are respectively limited in the radial direction and the axial direction, so that the aluminum plate and the negative electrode post can be prevented from rotating mutually in the axial direction, and can be prevented from moving mutually in the vertical direction, and the integral structural stability is ensured.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the overall structure of a cylindrical lithium battery according to an embodiment of the present invention;
FIGS. 2 (a) -2 (b) are a cross-sectional view and an exploded view of a negative electrode cap according to an embodiment of the present invention;
FIGS. 3 (base:Sub>A) -3 (c) arebase:Sub>A schematic three-dimensional structure,base:Sub>A top view andbase:Sub>A sectional view A-A ofbase:Sub>A negative electrode post according to an embodiment of the present invention;
FIG. 3 (d) is a schematic structural diagram of another embodiment of the negative electrode post;
FIGS. 4 (base:Sub>A) to 4 (d) arebase:Sub>A three-dimensional perspective view,base:Sub>A top view,base:Sub>A sectional view A-A andbase:Sub>A partially enlarged view of an aluminum plate structure according to an embodiment of the present invention;
in the figure, 1 a negative electrode top cover; 2, an aluminum shell; 3, a negative current collector; 4, winding core; 5, a positive current collector;
101, a negative electrode post; 102, injection molding plastic; 103 fluororubber; 104 aluminum plate; 105 lower plastic cement;
1011 cutting structure; 1012 a disk structure; 1013 cylindrical surfaces; 1041 of flanging structure; 1042 a notch structure;
d2: the thickness of the flanging structure; l2: the distance between the flanging structure and the aluminum plate main body; l3 depth of the notch; d1, the thickness of an aluminum plate;
h1: the depth of the grooving structure; l1: the height of the slot structure.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The first embodiment is as follows:
in this embodiment, a top cover structure of a lithium battery is illustrated, but it does not mean that the top cover structure of the battery provided by the present invention is only applicable to lithium batteries. It can also be suitable for other types of battery structures according to different installation batteries.
In this embodiment, a battery top cap structure is disclosed, comprising: the negative electrode top cover (1) is composed of a negative electrode pole (101), injection-molded upper plastic (102), fluororubber (103), an aluminum plate (104) and lower plastic (105), as shown in fig. 2 (a) -2 (b).
The negative electrode post (101) comprises a disc structure (1012) and a cylinder arranged on the disc structure (1012), and a slot structure (1011) is formed on the cylindrical surface (1013) outside the cylinder, as shown in fig. 3 (a) -3 (b).
In one embodiment, the 4 groove structures (1011) are uniformly arranged on the cylindrical surface (1013) of the negative electrode post (101). Fig. 3 (d) is a schematic structural diagram of another embodiment of the negative electrode post, in this example, the number of the groove structures (1011) is 2. The number of the cutting groove structures (1011) can be adjusted according to actual requirements, and is not limited herein.
The grooving structure (1011) is formed on the cylindrical body of the negative electrode post (101), and the section left on the cylindrical surface (1013) after the grooving structure is formed is a plane, a concave surface, a triangle and the like.
When the plastic (102) is injected and dissolved into the notch structure (1011), the structural strength of the top cover can be greatly enhanced, and the radial and axial movement, particularly the rotation movement, of the cathode post (101) is limited.
In one embodiment, the depth (H1) of the recess structure (1011) satisfies: h1 is more than 0 and less than or equal to 2mm, and the height (L1) of the steel wire rope satisfies the following conditions: l1 is more than 0 and less than or equal to 4mm, and is shown in the attached figure 3 (c).
The disc structure (1012) is mainly used for matching with the fluororubber (103), and the whole structure is sealed by compressing the fluororubber (103).
The aluminum plate (104) is provided with a flanging structure (1041) and a notch structure (1042), as shown in fig. 4 (a) -4 (d). The notch structure (1042) may be circular, rectangular, kidney-shaped, etc.
The flanging structure (1041) is formed by stamping and bending the aluminum plate base material and is integrated with the aluminum plate (104).
Referring to fig. 4 (d), in this embodiment, as the thinner the bending part of the metal part is, the easier it is to bend, and stress concentration is not easy to occur, so that the problem of cracking of the bending can be well avoided; but because of the requirement of the structural strength of the aluminum plate, the aluminum plate needs to keep a certain thickness, therefore, D2 is more than or equal to 0.5 and less than or equal to 2.5mm is selected as the thickness of the flanging structure (1041), the flanging strength can be ensured, meanwhile, the stress concentration of a bending part caused by bending and flanging can be reduced, and cracking is avoided, and the optimal value is 1.0mm,1.5mm and 2.0mm.
In addition, (L3) is the depth of the notch, and the value range is as follows: l3 is more than 0 and less than or equal to 2mm, and the optimal value is 0.5mm and 1.0mm.
Based on the material selection thickness of whole structure, thickness (D2) and the peripheral aluminum plate base material thickness in middle part of flanging structure (1041) be aluminum plate thickness D1's relation preferred: D2/D1 is more than or equal to 0.2 and less than 1.
More specifically, the distance between the flanging and the aluminum plate main body is more than 0 and less than or equal to 4mm, the optimal values are 1mm,1.5mm,2.0mm and 3mm, interference between the flanging and the main body structure during bending can be avoided, meanwhile, more contact area is reserved for injection molding plastic (102), and the structure is guaranteed to be firmer.
The notch structures (1042) are arranged around the flanging structures (1041), and the number of the notch structures is preferably 4, 6 or 8.
In this embodiment, because the notch structure (1042) of aluminum plate (104) and the grooving structure (1011) of negative pole post (101) exist, when plastic (102) was moulded plastics and is moulded plastics in the subassembly, radial and axial spacing has been carried out to aluminum plate (104) and negative pole post (101) respectively, both prevented aluminum plate (104) and negative pole post (101) at axial rotation each other, can prevent aluminum plate (104) and negative pole post (101)'s mutual motion again in vertical direction to guarantee holistic structural stability.
In the embodiment, the aluminum plate (104) and the aluminum shell (2) are welded by laser, and the aluminum plate (104) and the aluminum shell (2) are electrically and structurally connected. Structurally, the aluminum plate (104) and the aluminum shell (2) are integrally fixed and the battery is sealed.
Since the negative electrode post (101) is not fixed in the sealing process, in the embodiment, the aluminum plate (104) is pressed on the fluororubber (103) and is extruded by the die, and then the negative electrode post (101) is sleeved in the aluminum plate, so that the horizontal displacement of the negative electrode post (101) can be prevented.
Since the displacement and torsion of the negative electrode post (101) in the vertical direction are not limited, in the embodiment, the plastic (102) can be well fixed by arranging the turnover structure (1041) and the notch structure (1042) on the aluminum plate (104), and meanwhile, the movement and the rotation movement of the negative electrode post (101) in the vertical direction can be prevented by fixing the plastic (102) and the negative electrode post (101) with the notch structure (1011) in the injection molding. It is considered that the injection-molded plastic (102) is firmly fixed by the flanging structure (1041) and the notch structure (1042) on the aluminum plate (104), and the notch structure (1011) on the negative electrode post (101) firmly fixes the negative electrode post (101) by the injection-molded plastic (102), so as to prevent the vertical displacement and the rotational displacement of the negative electrode post (101).
In one embodiment, a method for assembling a battery top cover structure is also disclosed, comprising:
sleeving a lower plastic (105) and fluororubber (103) on the cathode pole (101);
pressing the aluminum plate (104) on the fluororubber (103), extruding through a die to ensure the compression amount of the fluororubber (103), and simultaneously injecting plastic (102) on the assembled components in the die;
when the plastic (102) is injected into the assembly, the notch structure (1041) of the aluminum plate (104) and the notch structure (1011) of the negative electrode post (101) respectively limit the aluminum plate (104) and the negative electrode post (101) in the radial direction and the axial direction. The structural strength can be realized after the injection molding plastic (102) is cooled.
This embodiment is through optimizing the structure to negative pole post (101) and aluminum plate (104), has guaranteed the structural strength of electric core top cap, mainly embodies and is equipped with grooving structure (1011) in negative pole post (101), and aluminum plate (104) are equipped with turn-ups structure (1041) and notch structure (1042), and the rethread injection moulding process makes the three fix completely and lock and die to realize leakproofness, insulating nature and the structural strength of structure.
According to the top cover structure, the production cost of the top cover is reduced and the space utilization rate of a lithium battery is improved by simplifying the top cover structure, meanwhile, the mechanical performance of the top cover is optimized, the top cover is limited in the vertical direction and the circumferential direction through the structural design, and the structural stability of the top cover is ensured.
Example two:
based on the battery top cap structure of embodiment one, a battery is disclosed, and it mainly comprises negative pole top cap (1), aluminum hull (2), negative pole current collector (3), book core (4) and anodal current collector (5), as shown in fig. 1.
In one embodiment, the battery is a cylindrical lithium battery.
Specifically, the negative electrode top cover (1) is electrically connected with the negative electrode current collector (3) through laser welding, the negative electrode current collector (3) and the positive electrode current collector (5) are electrically connected with the winding core (4) through laser welding, the positive electrode current collector (5) is electrically connected with the aluminum shell (2) through laser welding, so that the aluminum shell (2) is positively charged, and the aluminum plate (104) of the negative electrode top cover (1) is electrically connected with the aluminum shell (2) through laser welding, so that the aluminum plate (104) of the negative electrode top cover (1) is positively charged, and the negative electrode post (101) is negatively charged, so that the integration of a positive electrode terminal and a negative electrode terminal is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (12)
1. A battery top cap structure, characterized by includes: the cathode top cover (1), the cathode top cover (1) at least comprises a cathode pole (101), an aluminum plate (104) and injection-molded plastic (102);
the middle part of the aluminum plate (104) is provided with a flanging structure (1041), and the notch structure (1042) surrounds the flanging structure (1041);
the negative pole column (101) comprises a disc structure (1012) and a cylinder arranged on the disc structure (1012), and a groove cutting structure (1011) is formed on a cylindrical surface (1013) on the outer side of the cylinder;
the notch structure (1042) is used for fixing injection-molded plastic (102), and the notch structure (1011) fixes the negative pole post (101) through the injection-molded plastic (102) to limit the negative pole post (101).
2. A battery top cover structure according to claim 1, wherein the plurality of grooves (1011) are uniformly or non-uniformly arranged on the cylindrical surface (1013) of the negative electrode post (101).
3. A battery top cover structure according to claim 1 or 2, characterized in that the depth (H1) of the slot structure (1011) has a value in the range of: h1 is more than 0 and less than or equal to 2mm, and the value range of the height (L1) of the grooving structure (1011) is as follows: l1 is more than 0 and less than or equal to 4mm.
4. A battery top cover structure according to any of claims 1-3, wherein said slot 1011 has a flat, concave or triangular cross-section on the cylindrical surface 1013.
5. A battery top cover structure according to any of claims 1-4, wherein said negative electrode top cover (1) further comprises a fluoro-rubber (103), and a lower plastic (105);
the lower plastic (105) and the fluororubber (103) are respectively sleeved on the negative electrode pole (101), the fluororubber (103) is pressed on the upper surface of the disc structure (1012) except the mounting cylinder, and the aluminum plate (104) is used for pressing on the fluororubber (103).
6. The battery top cover structure according to claim 1, wherein the flanging structure (1041) is formed by stamping and bending an aluminum plate substrate and is integrated with the aluminum plate (104).
7. The battery top cover structure according to claim 1, wherein the aluminum base material of the aluminum plate (104) at the middle part for arranging the flanging structure (1041) has different thickness from the aluminum base material at the outer periphery of the middle part, and a gap is formed between the flanging structure (1041) and the aluminum base material at the outer periphery of the middle part to form the notch.
8. The battery top cover structure according to claim 7, wherein the thickness of the aluminum base material for providing the flanging structure (1041) in the middle part is smaller than that of the aluminum base material on the outer periphery of the middle part.
9. The battery top cover structure according to claim 7, wherein the thickness (D2) of the flanging structure (1041) has a value range of: d2 is more than or equal to 0.5 and less than or equal to 2.5mm;
preferably, the depth (L3) of the notch has a value range of: l3 is more than 0 and less than or equal to 2mm.
Preferably, the value range of the distance L2 between the flanging structure (1041) and the aluminum plate main body is as follows: l2 is more than 0 and less than or equal to 4mm.
Preferably, the relation between the thickness (D2) of the flanging structure (1041) and the thickness D1 of the aluminum plate base material on the periphery of the middle part is as follows: D2/D1 is more than or equal to 0.2 and less than 1.
10. A method of assembling a battery top cover structure according to any of claims 1-9, comprising:
sleeving a lower plastic (105) and fluororubber (103) on the cathode pole (101);
pressing an aluminum plate (104) on the fluororubber (103), extruding through a die to ensure the compression amount of the fluororubber (103), and simultaneously injecting plastic (102) on the assembled components in the die;
when plastic (102) is injected into the assembly, the notch structure (1041) of the aluminum plate (104) and the grooving structure (1011) of the negative pole post (101) respectively limit the aluminum plate (104) and the negative pole post (101) in the radial direction and the axial direction.
11. A battery, characterized by comprising the battery top cover structure of any one of claims 1 to 9, an aluminum case (2), a negative current collector (3), a jelly roll (4) and a positive current collector (5);
the battery top cover structure comprises a negative electrode top cover (1), wherein the negative electrode top cover (1) is electrically connected with a negative electrode current collector (3), the negative electrode current collector (3) and a positive electrode current collector (5) are electrically connected with a roll core (4), and the positive electrode current collector (5) is electrically connected with an aluminum shell (2) simultaneously.
12. A battery according to claim 11, characterized in that the aluminium plate (104) of the negative cap (1) is electrically connected to the aluminium can (2).
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| CN203481289U (en) * | 2013-08-23 | 2014-03-12 | 比亚迪股份有限公司 | Lithium ion battery and cover plate module thereof |
| CN205657096U (en) * | 2016-05-16 | 2016-10-19 | 宁德时代新能源科技股份有限公司 | Secondary cell top cap |
| CN110323367A (en) * | 2019-07-04 | 2019-10-11 | 湖北金泉新材料有限责任公司 | Top cover, the assembly method of top cover and battery |
| CN110335980A (en) * | 2019-07-24 | 2019-10-15 | 苏州炬鸿通讯电脑科技有限公司 | A kind of cover board structure of lithium battery that can improve capacity |
| CN217405566U (en) * | 2022-01-06 | 2022-09-09 | 华为数字能源技术有限公司 | Secondary battery's top cap and secondary battery |
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