CN220604806U - Lithium battery - Google Patents
Lithium battery Download PDFInfo
- Publication number
- CN220604806U CN220604806U CN202321985220.5U CN202321985220U CN220604806U CN 220604806 U CN220604806 U CN 220604806U CN 202321985220 U CN202321985220 U CN 202321985220U CN 220604806 U CN220604806 U CN 220604806U
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- China
- Prior art keywords
- explosion
- proof
- steel shell
- current collecting
- negative electrode
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 136
- 239000010959 steel Substances 0.000 claims abstract description 136
- 238000004880 explosion Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 21
- 238000005406 washing Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model relates to the technical field of batteries, and provides a lithium battery, which comprises: steel shell, negative electrode current collecting disc and explosion-proof piece; the negative electrode current collecting disc is positioned in the steel shell and is close to the bottom of the steel shell, and the negative electrode current collecting disc is used for being connected with the end part of the rolling core; the bottom of the steel shell is provided with an opening, the explosion-proof piece is arranged at the bottom of the steel shell and covers the opening, and the explosion-proof piece is provided with an explosion-proof nick; the negative electrode current collecting disc is provided with a plurality of shrapnel, and separation between the adjacent shrapnel, the shrapnel can be directed to deviate from the one side of rubbing the roll core and bounce. According to the utility model, the explosion-proof piece is arranged at the negative electrode end of the battery, so that the steel shell and the explosion-proof piece can be punched separately, and the stability is improved; through setting up the opening in the bottom of steel casing, negative pole current collecting disc, explosion-proof spare, opening set gradually, and negative pole current collecting disc, explosion-proof spare are located in the steel casing, can in time release when the inside pressure of steel casing is too big, effectively prevent explosion, and the explosion-proof nature is good, and stability is high.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a lithium battery.
Background
Since the battery is sealed in a closed container, the battery may generate a phenomenon of air blowing or even explosion in case of incorrect use, and thus the explosion-proof device is one of important safety devices on the lithium battery.
At present, a main stream of large cylindrical batteries is provided with a plurality of explosion-proof devices on a positive electrode cap structure, a shell is used as a negative electrode, only a small part of small-diameter steel shells are provided, and scores are punched at the bottom of the shell to form the explosion-proof devices; from the market feedback condition, the explosion-proof pressure of the shell bottom stamping notch is unstable, and mainly because the notch and the steel shell are integrally stamped, the stamping stroke is larger than the height of the steel shell, the equipment is slightly unstable, and the pressure instability condition can occur; and the stroke is difficult to control, and especially the steel shell with extremely high height, the equipment stroke is bigger, and stability is worse, can't play the effect of protection battery.
Disclosure of Invention
The utility model provides a lithium battery which is used for solving the problem of poor stability of an explosion-proof device of the lithium battery in the prior art.
The present utility model provides a lithium battery comprising: steel shell, negative electrode current collecting disc and explosion-proof piece; the negative electrode current collecting disc is positioned in the steel shell and is close to the bottom of the steel shell, and the negative electrode current collecting disc is used for being connected with the end part of the rolling core; the bottom of the steel shell is provided with an opening, the explosion-proof piece is arranged at the bottom of the steel shell and covers the opening, and the explosion-proof piece is provided with an explosion-proof nick; the negative electrode current collecting disc is provided with a plurality of elastic pieces, the adjacent elastic pieces are separated, and the elastic pieces can spring up towards one side deviating from the rubbing and flattening winding core.
According to the lithium battery provided by the utility model, the connecting arm is arranged between the opening and the side wall surface of the steel shell; the connecting arm comprises a connecting part and a supporting part, wherein the connecting part is connected with the peripheral wall of the steel shell, the explosion-proof piece is arranged on the supporting part, and the vertical distance between the explosion-proof piece and the negative electrode current collecting disc is greater than or equal to the vertical distance between the connecting part and the negative electrode current collecting disc.
According to the lithium battery provided by the utility model, the connecting arm is arranged between the opening and the side wall surface of the steel shell; the connecting arm comprises a connecting part, a protruding part and a supporting part, wherein the connecting part is connected with the peripheral wall of the steel shell, the protruding part protrudes towards the inside of the steel shell, two sides of the protruding part are respectively in transitional connection with the connecting part and the supporting part, and the explosion-proof piece is arranged on the supporting part; the vertical distance between the explosion-proof piece and the negative electrode current collecting disc is greater than or equal to the vertical distance between the protruding part and the negative electrode current collecting disc.
According to the lithium battery provided by the utility model, the lithium battery further comprises the protection piece, wherein the protection piece is covered at the bottom of the explosion-proof piece and is positioned at the outer side of the bottom of the steel shell.
According to the lithium battery provided by the utility model, the vertical distance between the protective piece and the negative electrode current collecting disc is smaller than or equal to the vertical distance between the connecting part and the negative electrode current collecting disc.
According to the lithium battery provided by the utility model, the protective piece is a nonmetal manufactured piece.
According to the lithium battery provided by the utility model, the size of the explosion-proof nick is smaller than or equal to the size of the opening.
According to the lithium battery provided by the utility model, the explosion-proof notch is arranged on at least one side of the explosion-proof piece.
According to the lithium battery provided by the utility model, the explosion-proof piece is arranged at the negative electrode end of the battery, so that the steel shell and the explosion-proof piece can be punched separately, and the stability is improved; through setting up the opening in the bottom of steel casing, negative pole current collecting disc, explosion-proof spare, opening set gradually, and negative pole current collecting disc, explosion-proof spare are located in the steel casing, can in time release when the inside pressure of steel casing is too big, effectively prevent explosion, and the explosion-proof nature is good, and stability is high.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is an exploded view of a lithium battery provided in some embodiments of the present utility model;
fig. 2 is a front view of a lithium battery provided in some embodiments of the utility model;
FIG. 3 is a cross-sectional view of A-A of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is one of the partial enlarged views at B in FIG. 4 provided by some embodiments of the utility model;
FIG. 6 is a second embodiment of the present utility model providing a partial enlarged view at B in FIG. 4;
fig. 7 is a schematic structural view of a negative current collecting plate according to some embodiments of the present utility model;
fig. 8 is a schematic structural view of an explosion-proof member according to some embodiments of the present utility model.
Reference numerals:
1. a steel shell; 11. an opening; 12. a connecting arm; 121. a connection part; 122. a boss; 123. a support part; 2. an explosion-proof member; 21. explosion-proof nicks; 3. a guard; 4. a positive electrode current collecting plate; 5. rubbing the winding core; 6. a negative electrode current collecting plate; 61. a spring plate; 7. a cover plate; 71. a liquid injection hole; 8. and (5) a rivet.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
The explosion-proof device is one of the important safety devices on lithium batteries. The battery in the related art is provided with a notch directly punched at the bottom of the steel shell, so that the stability is poor, and the battery cannot be protected.
In contrast, the utility model provides a lithium battery, wherein the positive electrode is designed on a cover plate 7, the negative electrode is a shell bottom and a shell body of a steel shell 1, meanwhile, an explosion-proof piece 2 is arranged at the bottom of the steel shell 1, the explosion-proof piece 2 is arranged at the bottom of the steel shell 1, and the explosion-proof piece 2 and the steel shell 1 are independently stamped to ensure the stability of explosion-proof pressure; and meanwhile, the explosion-proof piece 2 is welded with the bottom of the shell, so that the tightness of the battery is ensured.
The lithium battery and the production method of the present utility model are described below with reference to fig. 1 to 8.
As shown in fig. 1, 2 and 3, the lithium battery provided by the present utility model includes: steel shell 1, negative electrode current collecting disc 6 and explosion-proof piece 2; the negative electrode current collecting disc 6 is positioned in the steel shell 1 and is close to the bottom of the steel shell 1, and the negative electrode current collecting disc 6 is used for being connected with the end part of the rolling core 5; the bottom of the steel shell 1 is provided with an opening 11, the explosion-proof piece 2 is arranged at the bottom of the steel shell 1, the opening 11 is covered by the explosion-proof piece 2, and the explosion-proof piece 2 is provided with an explosion-proof notch 21; the negative electrode current collecting plate 6 is provided with a plurality of elastic pieces 61, the adjacent elastic pieces 61 are separated, and the elastic pieces 61 can spring up towards one side away from the rubbing winding core 5.
According to the lithium battery provided by the utility model, the explosion-proof piece 2 is arranged at the negative electrode end of the battery, so that the steel shell 1 and the explosion-proof piece 2 can be punched separately, and the stability is improved; through setting up opening 11 in the bottom of steel casing 1, negative pole current collecting plate 6, explosion-proof piece 2, opening 11 set gradually, and negative pole current collecting plate 6, explosion-proof piece 2 locate in the steel casing 1, can in time release when the inside pressure of steel casing 1 is too big, effectively prevent explosion, and the explosion-proof nature is good, and stability is high.
The lithium battery further comprises a cover plate 7, an anode current collecting disc 4 and a rolling core 5, wherein the anode current collecting disc 4 and a cathode current collecting disc 6 are arranged at two ends of the rolling core 5, and the anode current collecting disc 4 and the rolling core 5 are positioned in the steel shell 1; the apron 7 sets up in the top of steel casing 1, and apron 7 is the positive pole of battery.
As shown in fig. 7, the negative electrode current collecting disc 6 is provided with a plurality of elastic pieces 61, and the adjacent elastic pieces 61 are separable, when the explosion-proof piece 2 at the bottom of the steel shell 1 is opened, the elastic pieces 61 can spring up towards one side deviating from the rolling core 5, so that the negative electrode current collecting disc 6 is opened outwards, and gas is discharged easily.
In some embodiments, the anode current collecting plate 6 is in a planar structure, the plurality of elastic pieces 61 may be circumferentially arranged around the central axis of the anode current collecting plate 6, the shape of the elastic pieces 61 may be a sector, the top ends and two sides of adjacent sectors are spaced or stacked, the tail ends of the sectors are connected, and when the explosion-proof member 2 at the bottom of the steel shell 1 is opened, the elastic pieces 61 are opened by rotating outwards with the tail ends as a rotation axis.
Wherein, steel shell 1 and explosion-proof piece 2 are two stamping parts, and wherein, the bottom of steel shell 1 is equipped with opening 11, and opening 11 can be circular opening 11.
The size of the explosion-proof member 2 is matched with the size of the opening 11 (the size of the explosion-proof member 2 is larger than the size of the opening 11), and the explosion-proof member 2 is arranged inside the steel shell 1.
The explosion-proof piece 2 and the steel shell 1 are welded together in a laser welding mode to form a whole, so that the steel shell 1 has an explosion-proof function.
In one embodiment, as shown in fig. 4 and 6, a connecting arm 12 is arranged between the opening 11 and the side wall surface of the steel shell 1; the connecting arm 12 comprises a connecting part 121 and a supporting part 123, the connecting part 121 is connected with the peripheral wall of the steel shell 1, the explosion-proof piece 2 is arranged on the supporting part 123, and the vertical distance between the explosion-proof piece 2 and the cathode current collecting disc 6 is greater than or equal to the vertical distance between the connecting part 121 and the cathode current collecting disc 6.
Wherein the explosion-proof member 2 is provided with an explosion-proof score 21.
In some embodiments, the explosion vent 21 is disposed on at least one side of the explosion proof member 2.
As shown in fig. 8, the explosion-proof notch 21 on the explosion-proof member 2 may be circular, in a shape of a Chinese character ' mi ', a V ' or other shapes, which is beneficial for gas discharge.
In some embodiments, the explosion protection score 21 is provided on the side of the explosion protection member 2 facing into the steel shell 1, so that the pressure in the steel shell 1 can be released in time when the pressure is excessive.
Or, in some embodiments, the explosion-proof notch 21 is arranged on one side of the explosion-proof piece 2 facing to the outside of the steel shell 1, when the battery in the steel shell 1 is shorted or the pressure in the steel shell 1 is excessively high due to other reasons, the explosion-proof notch 21 deforms to one side far away from the center of the steel shell 1, when the internal pressure reaches the explosion pressure, the deformation reaches the limit, the explosion-proof piece 2 is broken from the explosion-proof notch 21, and the pressure is relieved in time, so that the explosion and the fire of the battery are effectively prevented.
Alternatively, in some embodiments, the explosion-proof scores 21 are provided on both sides of the explosion-proof member 2, and both sides are provided symmetrically so as to facilitate pressure bursting.
Further, the size of the explosion-proof score 21 is smaller than or equal to the size of the opening 11.
Specifically, a space exists between the end of the explosion-proof notch 21 and the connecting arm 12, so that the explosion-proof notch 21 and the connecting arm 12 (the supporting part 123) are prevented from overlapping, pressure relief is affected, and stability is good.
Wherein, the circumference of the explosion-proof piece 2 is arranged on the connecting arm 12, namely, a superposition part exists between the explosion-proof piece 2 and the connecting arm 12.
Wherein, explosion-proof piece 2 locates the inside of steel casing 1, and explosion-proof piece 2's periphery and supporting part 123 welding form a whole, make steel casing 1 have explosion-proof function.
Further, the inner side of the explosion-proof piece 2 is flush with the inner side wall surface of the connecting part 121 or lower than the inner side wall surface of the connecting part 121, that is, the vertical distance between the connecting part 121 and the cathode current collecting disc 6 is smaller than or equal to the vertical distance between the explosion-proof piece 2 and the cathode current collecting disc 6, so that the connecting part 121 is in contact with the battery inside the steel shell 1, the explosion-proof piece 2 is prevented from being in contact with and collision with the battery inside the steel shell 1, and the stability is improved.
In another embodiment, as shown in fig. 4 and 5, a connecting arm 12 is arranged between the opening 11 and the side wall surface of the steel shell 1; the connecting arm 12 comprises a connecting part 121, a protruding part 122 and a supporting part 123, the connecting part 121 is connected with the peripheral wall of the steel shell 1, the protruding part 122 protrudes towards the inside of the steel shell 1, two sides of the protruding part 122 are respectively in transitional connection with the connecting part 121 and the supporting part 123, and the explosion-proof piece 2 is arranged on the supporting part 123; the vertical distance between the explosion-proof piece 2 and the negative electrode current collecting plate 6 is greater than or equal to the vertical distance between the protruding part 122 and the negative electrode current collecting plate 6.
The connecting arm 12 is provided with a protruding portion 122, the protruding portion 122 protrudes toward one side near the center of the steel shell 1, and two sides of the protruding portion 122 are respectively provided with a supporting portion 123 and a connecting portion 121.
The connecting portion 121 is connected with the peripheral wall of the steel shell 1, and the supporting portion 123 is used for supporting and limiting the explosion-proof member 2, that is, the periphery of the explosion-proof member 2 is connected with the inner top surface of the supporting portion 123, so that the explosion-proof member 2 and the steel shell 1 form a whole, and an explosion-proof function is achieved.
Wherein, explosion-proof spare 2 is located steel casing 1, and explosion-proof spare 2 sets up on supporting part 123, is connected with supporting part 123, and explosion-proof spare 2's top surface and the top surface parallel and level of bellying 122, or explosion-proof spare 2's top surface is less than the top surface of bellying 122, after the battery is put into just the shell, explosion-proof spare 2 is greater than or equal to the perpendicular distance of bellying 122 and negative pole current collecting plate 6 with the perpendicular distance of negative pole current collecting plate 6, avoids explosion-proof spare 2 and battery contact, collision in the steel casing 1, improves stability.
Further, the explosion-proof piece 2 and the connecting arm 12 are welded together in a laser welding mode to form a whole, so that the steel shell 1 has an explosion-proof function.
Furthermore, the lithium battery provided by the utility model further comprises a rust-proof layer, and the rust-proof layer is covered at the joint of the explosion-proof piece 2 and the steel shell 1.
The welding position of the explosion-proof piece 2 and the steel shell 1 can be outside the steel shell 1 or inside the steel shell 1; in order to prevent the connection of the explosion-proof piece 2 and the steel shell 1 from rusting to influence the explosion-proof performance, the utility model performs rust-proof treatment on the connection of the explosion-proof piece 2 and the steel shell 1, for example, the connection can be solidified by coating UV glue or by coating rust-proof oil, rust-proof paint and the like, and a rust-proof layer is formed at the connection of the explosion-proof piece 2 and the steel shell 1 to protect a welding seam at the connection of the explosion-proof piece 2 and the steel shell 1 and improve the tightness.
Furthermore, the lithium battery provided by the utility model further comprises a protective piece 3, wherein the protective piece 3 is covered on the bottom of the explosion-proof piece 2 and is positioned on the outer side of the bottom of the steel shell 1.
Specifically, the protection piece 3 can be a single-sided local gum structure, the protection piece 3 is adhered to the bottom of the steel shell 1, the explosion-proof piece 2 is protected, and the explosion-proof performance is prevented from being influenced by failure of the explosion-proof piece 2 due to external collision.
Further, the vertical distance between the guard 3 and the anode current collecting plate 6 is smaller than or equal to the vertical distance between the connecting portion 121 and the anode current collecting plate 6.
Specifically, the bottom surface of the protecting member 3 disposed at the bottom of the steel can 1 is lower than the bottom surface of the connecting portion 121, that is, the vertical distance between the bottom surface of the protecting member 3 and the anode current collecting plate 6 is smaller than or equal to the vertical distance between the bottom surface of the connecting portion 121 and the anode current collecting plate 6, that is, the connecting portion 121 is preferentially contacted with the external member, so that the protecting member 3 is prevented from contacting with the external member, and thus, the explosion-proof member 2 disposed inside the steel can 1 is prevented from being failed due to the collision of the external member, and the explosion-proof performance is prevented from being affected.
The guard 3 in the present utility model is a non-metallic material fabricated part, including a polypropylene material fabricated part.
According to the lithium battery provided by the utility model, the explosion-proof piece 2 is an independent punched piece, and the pressure is stable; the bottom of the steel shell 1 is provided with the opening 11, the explosion-proof piece 2 is arranged in the steel shell 1 and welded with the steel shell 1, so that the steel shell 1 has an explosion-proof function, when the pressure in the steel shell 1 is overlarge, the explosion-proof piece 2 deforms and breaks towards one side far from the center of the steel shell 1, the effect of releasing pressure in time is achieved, and explosion and fire of a battery are prevented; the rust-proof layer is arranged at the joint of the explosion-proof piece 2 and the steel shell 1, so that the joint is protected, and the tightness is improved; through setting up guard piece 3 in the bottom of steel casing 1, guard piece 3 covers locates explosion-proof piece 2, protects explosion-proof piece 2, avoids explosion-proof piece 2 and external part collision to influence the performance.
Based on the lithium battery in any one of the above embodiments, the present utility model further provides a method for producing a lithium battery, including: welding the steel shell 1 and the explosion-proof piece 2 through laser welding, wherein the explosion-proof piece 2 is positioned in the steel shell 1, and the periphery of the explosion-proof piece 2 is attached to the connecting arm 12; detecting the tightness of the joint of the steel shell 1 and the explosion-proof piece 2; welding the bottom of the steel shell 1 with the negative electrode current collecting disc 6 by penetration welding, wherein the negative electrode current collecting disc 6 is close to the explosion-proof piece 2; welding the steel shell 1 and the cover plate 7 by laser welding, and sealing; detecting the tightness of the joint of the steel shell 1 and the cover plate 7; cleaning and drying the battery, and smearing an antirust layer on the joint of the steel shell 1 and the explosion-proof piece 2; and a protective piece 3 is stuck, wherein the protective piece 3 is covered on the bottom of the explosion-proof piece 2 and is positioned on the outer side of the bottom of the steel shell 1.
According to the production method of the lithium battery, the explosion-proof piece 2 is an independent punched piece, and the pressure is stable; the bottom of the steel shell 1 is provided with the opening 11, the explosion-proof piece 2 is arranged in the steel shell 1 and welded with the steel shell 1, so that the steel shell 1 has an explosion-proof function, when the pressure in the steel shell 1 is overlarge, the explosion-proof piece 2 deforms and breaks towards one side far from the center of the steel shell 1, the effect of releasing pressure in time is achieved, and explosion and fire of a battery are prevented; the rust-proof layer is arranged at the joint of the explosion-proof piece 2 and the steel shell 1, so that the joint is protected, and the tightness is improved; through setting up guard piece 3 in the bottom of steel casing 1, guard piece 3 covers locates explosion-proof piece 2, protects explosion-proof piece 2, avoids explosion-proof piece 2 and external part collision to influence the performance.
In the embodiment, the model 46155 is taken as an example, the diameter of the steel shell 1 is 46mm, the height is 155mm, the steel shell 1 is manufactured by using a domestic Bao-steel cold-rolled steel strip as a raw material, the brand is BDCK, the thickness of the raw material is 0.5mm, the wall thickness after stretching is 0.3mm, and the diameter of a bottom hole is 28mm.
The steel shell 1 stamping comprises blanking stamping, shell bottom stamping, stretching and thinning stretching stretch-ironing-stretch-shell bottom hole punching-shaping-notch portion scrap-blanking. The steel shell 1 electroplating is to perform feeding, degreasing, water washing, barrel changing, water washing, acid washing, water washing, neutralization, water washing, activation, water washing, nickel plating, recycling, water washing, bleaching, water washing, passivation, water washing, barrel changing, water washing, protection, water washing, draining, drying, cooling, blanking and inspection on the stamped steel shell 1 to obtain the qualified electroplated steel shell 1. If the steel shell 1 is made of a nickel-plated steel strip, nickel plating treatment is not needed after stamping. The manufacturing of the explosion-proof piece 2 comprises the steps of stamping, degreasing, cleaning and detecting, and the qualified explosion-proof piece 2 is obtained.
After the steel shell 1 and the explosion-proof piece 2 are manufactured, the following steps are carried out:
1. preparing a winding core: homogenizing the positive electrode and the negative electrode, coating the positive electrode and the negative electrode, rolling the positive electrode and the negative electrode, slitting, winding, and flattening the positive electrode and the negative electrode to obtain the flattening winding core 5.
2. Welding a collecting disc: the positive and negative electrode current collecting discs 6 are welded at the positive and negative ends of the rolling core 5 in a laser welding mode, and the negative electrode current collecting discs 6 are welding areas.
3. Welding explosion-proof sheets: the explosion-proof member 2 is mounted inside the steel can 1, the explosion-proof notch 21 of the explosion-proof member 2 faces the outside of the steel can 1, and the bottom surface of the explosion-proof member 2 is completely contacted with the top surface plane of the supporting portion 123, so as to perform laser welding.
4. And (3) air tightness detection: helium gas detection is performed on the welded steel shell 1.
5. And (5) shell penetration welding: the negative electrode of the rolling core 5 is inwards arranged in the steel shell 1, the negative electrode current collecting disc 6 is completely contacted with the plane of the top surface of the protruding part 122, and laser passes through the groove of the protruding part 122 to perform penetration welding on the shell bottom and the negative electrode current collecting disc 6.
6. And (3) welding a cover plate 7: the cover plate 7 is assembled on the opening of the steel shell 1, and is sealed by laser welding.
7. And (3) air tightness detection: and (3) injecting a little helium gas from the liquid injection hole 71 on the cover plate 7, and performing airtight detection on the penetration welding position of the bottom of the shell and the sealing position of the cover plate 7.
8. And (3) liquid injection: electrolyte is injected from the injection hole 71 of the cover plate 7.
9. The liquid injection hole 71 is sealed and leak is detected: a little helium gas is injected from the liquid injection hole 71 on the cover plate 7, then the rivet 8 is used for sealing the liquid injection hole 71, and finally the helium gas detection is carried out on the sealing position.
10. Cleaning and protecting: cleaning and drying the battery, spraying UV glue (antirust glue and antirust paint) at the grooves of the convex parts 122 for rust prevention, and irradiating ultraviolet to solidify to form a rust prevention layer, so that the tightness of the lithium battery is further improved;
11. the protector 3 is attached to the outer bottom surface of the support 123.
12. Pre-filling and capacity-dividing: the battery is charged.
The whole battery is manufactured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A lithium battery, comprising: steel shell, negative electrode current collecting disc and explosion-proof piece;
the negative electrode current collecting disc is positioned in the steel shell and is close to the bottom of the steel shell, and the negative electrode current collecting disc is used for being connected with the end part of the rolling core;
the bottom of the steel shell is provided with an opening, the explosion-proof piece is arranged at the bottom of the steel shell and covers the opening, and the explosion-proof piece is provided with an explosion-proof nick;
the negative electrode current collecting disc is provided with a plurality of elastic pieces, the adjacent elastic pieces are separated, and the elastic pieces can spring up towards one side deviating from the rubbing and flattening winding core.
2. The lithium battery of claim 1, wherein the battery is configured to provide the battery with a battery power,
a connecting arm is arranged between the opening and the side wall surface of the steel shell;
the connecting arm comprises a connecting part and a supporting part, wherein the connecting part is connected with the peripheral wall of the steel shell, the explosion-proof piece is arranged on the supporting part, and the vertical distance between the explosion-proof piece and the negative electrode current collecting disc is greater than or equal to the vertical distance between the connecting part and the negative electrode current collecting disc.
3. The lithium battery of claim 1, wherein the battery is configured to provide the battery with a battery power,
a connecting arm is arranged between the opening and the side wall surface of the steel shell;
the connecting arm comprises a connecting part, a protruding part and a supporting part, wherein the connecting part is connected with the peripheral wall of the steel shell, the protruding part protrudes towards the inside of the steel shell, two sides of the protruding part are respectively in transitional connection with the connecting part and the supporting part, and the explosion-proof piece is arranged on the supporting part.
4. The lithium battery of claim 3, wherein the battery is configured to provide the lithium battery,
the vertical distance between the explosion-proof piece and the negative electrode current collecting disc is greater than or equal to the vertical distance between the protruding part and the negative electrode current collecting disc.
5. The lithium battery according to any one of claim 2 to 4, wherein,
the lithium battery further comprises a protection piece, wherein the protection piece is covered on the bottom of the explosion-proof piece and is positioned on the outer side of the bottom of the steel shell.
6. The lithium battery of claim 5, wherein the battery comprises a battery cell,
the vertical distance between the protective piece and the negative electrode current collecting disc is smaller than or equal to the vertical distance between the connecting part and the negative electrode current collecting disc.
7. The lithium battery of claim 5, wherein the guard is a non-metallic fabricated part.
8. The lithium battery of any one of claims 1-4, wherein the explosion-proof score has a size that is less than or equal to a size of the opening.
9. The lithium battery of any one of claims 1 to 4, further comprising a rust protection layer covering a junction of the explosion protection member and the steel case.
10. The lithium battery according to any one of claim 1 to 4, wherein,
the explosion-proof nick is arranged on at least one side of the explosion-proof piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321985220.5U CN220604806U (en) | 2023-07-26 | 2023-07-26 | Lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321985220.5U CN220604806U (en) | 2023-07-26 | 2023-07-26 | Lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220604806U true CN220604806U (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321985220.5U Active CN220604806U (en) | 2023-07-26 | 2023-07-26 | Lithium battery |
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| Country | Link |
|---|---|
| CN (1) | CN220604806U (en) |
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2023
- 2023-07-26 CN CN202321985220.5U patent/CN220604806U/en active Active
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