CN117134044A - Lithium ion battery structure - Google Patents

Lithium ion battery structure Download PDF

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Publication number
CN117134044A
CN117134044A CN202311067210.8A CN202311067210A CN117134044A CN 117134044 A CN117134044 A CN 117134044A CN 202311067210 A CN202311067210 A CN 202311067210A CN 117134044 A CN117134044 A CN 117134044A
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CN
China
Prior art keywords
aluminum shell
lithium ion
welding
ion battery
current collecting
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Pending
Application number
CN202311067210.8A
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Chinese (zh)
Inventor
闫飞
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Dongyang Liweineng New Energy Technology Co ltd
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Dongyang Liweineng New Energy Technology Co ltd
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Application filed by Dongyang Liweineng New Energy Technology Co ltd filed Critical Dongyang Liweineng New Energy Technology Co ltd
Priority to CN202311067210.8A priority Critical patent/CN117134044A/en
Publication of CN117134044A publication Critical patent/CN117134044A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Filling, Topping-Up Batteries (AREA)

Abstract

The utility model provides a lithium ion battery structure, which comprises a cap (1), a negative electrode current collecting disc (2), a winding core (3) and an aluminum shell (4), wherein the winding core is positioned in the aluminum shell, one end of the winding core is provided with a negative electrode lug, and the other end of the winding core is provided with a positive electrode lug; the upper surface of the negative electrode current collecting disc is fixedly welded with the cap by laser penetration, and the lower surface of the negative electrode current collecting disc is fixedly welded with the negative electrode tab by laser penetration; the positive electrode tab is fixedly connected with the bottom of the aluminum shell through laser penetration welding; an electrolyte injection opening (5) is arranged at the bottom of the aluminum shell, and a sealing structure is arranged at the electrolyte injection opening; a plurality of grooves (6) are vertically arranged on the inner wall of the aluminum shell at intervals. According to the utility model, a groove structure is formed on the inner wall of the aluminum shell, so that infiltration is started simultaneously inside and outside; the method not only quickens the infiltration time, but also solves the problem of uneven infiltration, ensures the final electrical performance of the lithium ion battery and ensures the consistency of the capacity.

Description

Lithium ion battery structure
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery structure.
Background
The lithium ion battery in the current market mainly comprises a shell, a cover plate and a sealing nail, wherein the shell and the cover plate can be connected through two processes of laser welding or heading, and the sealing nail and the cover plate are connected through a laser welding mode; because the structural design of the shell and the battery core of the battery is very tight, the ratio of the battery core to the internal space of the shell is more than 98%, and the liquid injection process is extremely difficult. Meanwhile, the residual space of the shell is smaller, and the electrolyte after liquid injection is easy to influence the final electric performance, capacity consistency and the like due to poor infiltration of the battery core caused by uneven distribution.
The utility model discloses a cylindrical aluminum shell lithium ion battery, the authorized bulletin number of which is CN 202977632U, and the problem of short circuit between the positive electrode and the negative electrode is avoided by welding the electrode lugs on the negative electrode plate and the electrode posts on the cap. However, the utility model still has the problems that the residual space of the shell is smaller, and the electrolyte after liquid injection is easy to influence the final electrical performance, capacity consistency and the like due to poor infiltration of the battery core caused by uneven distribution.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a lithium ion battery structure, which is used for solving the problems that the residual space of the existing lithium ion battery case is small, and the electrolyte after liquid injection is easy to affect the final electrical performance and the capacity consistency due to poor infiltration of the battery core caused by uneven distribution.
In order to achieve the above and other related objects, the present utility model provides a lithium ion battery structure, including a cap, a negative electrode current collecting disc, a winding core and an aluminum shell, wherein the winding core is located in the aluminum shell, one end of the winding core is provided with a negative electrode tab, and the other end is provided with a positive electrode tab; the upper surface of the negative electrode current collecting disc is fixedly connected with the cap through laser penetration welding, and the lower surface of the negative electrode current collecting disc is fixedly connected with the negative electrode tab through laser penetration welding; the positive electrode tab is fixedly welded with the bottom of the aluminum shell body through laser penetration; an electrolyte injection port is arranged at the bottom of the aluminum shell, and a sealing structure is arranged at the electrolyte injection port; the inner wall of the aluminum shell is vertically provided with a plurality of grooves at intervals.
In the prior art, the outer part of the winding core of the lithium ion battery is relatively tightly attached to the inner wall of the aluminum shell due to the large shell-entering proportion, the space reserved for electrolyte only remains in the middle of the winding core (the space after the winding needle is pulled out) and the extremely limited space between the top and the bottom of the winding core, the electrolyte can complete the liquid injection action from the external mechanism to the inside of the shell through a liquid injection port (the eccentric position on the top cover pole or the bottom of the shell) because of the eccentric position on the top cover surface or the eccentric position on the top cover pole), and the electrolyte can smoothly enter the inside of the shell because of the fact that the air in the shell is pulled out before the electrolyte is injected, but most of electrolyte can stay in the space remained in the middle of the winding core and then slowly infiltrate into the bottom of the winding core, and the electrolyte can gradually infiltrate into the pole pieces of the whole winding core from inside to outside through capillary effect because the smaller space remains between pole pieces in the winding state of the winding core; the whole soaking time is very long, and the problem that the manufactured battery has poor electric performance and capacity consistency due to poor soaking of the inside, the outside, the bottom and the end parts of the winding core is often easy to occur.
The lithium ion battery structure creatively forms a groove structure by punching the inner wall on the basis of the existing aluminum shell, the groove structure is vertically arranged at intervals along the inner wall of the shell, the groove is designed to enable a small part of electrolyte to contact with the outer wall of the winding core through a flow channel when the electrolyte just enters the shell under the condition that the integral structural strength of the aluminum shell is not affected, and most of electrolyte is still injected into the middle space of the winding core, meanwhile, the electrolyte stored at the bottom can also transport the electrolyte to the top of the winding core through the flow channel on the shell wall through capillary effect as much as possible, so that the inside and outside of the winding core are simultaneously soaked; the electrolyte filling device has the advantages that the infiltration time is shortened, the problem of non-uniformity in infiltration is solved, under the condition that the overall structural strength of the shell is not affected, the climbing flow channel of the electrolyte at the bottom is realized, the storage space of the electrolyte is increased, the problem that the electrolyte is easy to affect the final electrical performance and the capacity consistency due to poor infiltration of the battery core caused by non-uniformity in distribution (staying at the top or the bottom of a winding core) after filling the electrolyte is solved, the distribution uniformity of the electrolyte after filling the electrolyte can be improved, the infiltration yield of the battery core is improved, the final electrical performance of a lithium ion battery is ensured, and the capacity consistency is ensured. The upper surface of the negative electrode current collecting disc and the cover cap are fixed by laser penetration welding, so that the whole winding core can be ensured to have no relative movement in the aluminum shell. The laser penetration welding fixing process greatly reduces the risk of short circuit caused by dust entering the winding core; the liquid injection port is arranged at the bottom of the aluminum shell body to facilitate liquid injection.
Preferably, the grooves are uniformly distributed along the circumferential direction of the aluminum shell, and the cross section of each groove is provided with a round corner structure. The round corner structure is convenient for the smooth going on of punching press processing technology, guarantees that the punching press process can not cause the whole great deformation of taking place of aluminum hull and damage.
Preferably, the thickness of the aluminum shell is 0.5-0.7 mm, and the depth of the groove is 0.1-0.15 mm. The too large depth of the groove can influence the strength of the aluminum shell, the too small is difficult to machine and shape, and the distance between the groove and the bottom of the aluminum shell can be adjusted according to the addition amount of electrolyte.
Preferably, a welding boss is formed in the middle of the negative electrode current collecting disc in an upward protruding mode, a welding groove is formed in the bottom face of the cap in an inward concave mode, the welding boss is matched with the welding groove in shape, and the upper surface of the negative electrode current collecting disc and the cap are fixedly welded through laser penetration after being clamped and matched with the welding groove through the welding boss.
Preferably, the cap sequentially comprises a top cover, an insulating sleeve and a negative pole column which are mutually embedded and fixed from outside to inside, the insulating sleeve is arranged between contact surfaces of the top cover and the negative pole column, and the welding groove is arranged on the bottom surface of the negative pole column. The insulating sleeve is used for preventing the negative electrode current collecting disc from insulating and isolating with the top cover and preventing the positive electrode and the negative electrode of the lithium ion battery from being short-circuited.
The negative electrode current collecting disc and the negative electrode column are correspondingly designed into a concave-convex structure, and a welding process from outside to inside can be realized on one hand through bonding welding, so that dust is reduced; on the other hand, the welding depth can be greatly reduced, the laser power and the welding heat are reduced, the production cost is reduced, and the industrialization is facilitated.
Preferably, the bottom of the top cover is provided with an insulating stop frame along the outer side of the welding groove, and the insulating stop frame is in plug-in fit with a slot formed by the negative pole column, the insulating sleeve and the negative pole current collecting disc. The insulating stop frame is made of insulating materials, so that the short circuit of the anode and the cathode of the battery is prevented. The insulation stop frame is fixedly connected with the negative pole column, the insulation sleeve and the negative pole current collecting disc in an inserting mode, stability of the whole structure is improved, and the fact that all parts do not move relatively in the aluminum shell body is guaranteed.
Preferably, a lightening hole is arranged in the insulating stop frame. The weight-reducing holes can reduce weight, provide larger accommodating space for electrolyte, improve the distribution uniformity of the electrolyte after liquid injection, improve the infiltration yield of the battery core, ensure the final electrical performance of the lithium ion battery and ensure the capacity consistency.
Preferably, at least two insulating stopping frames are symmetrically distributed along the welding grooves, so that the distribution uniformity of electrolyte after liquid injection is improved.
Preferably, the winding core is formed by winding a positive plate and a negative plate, and the positive plate and the negative plate are completely isolated by a diaphragm.
Preferably, a welding part is formed at the edge of the top cover, the width of the welding part is matched with the thickness of the aluminum shell, and the top cover is welded and fixed with the upper end of the aluminum shell through the welding part; the welding part is designed to facilitate the sealing welding between the top cover and the aluminum shell.
Preferably, the aluminum shell is in a cylindrical structure or a cuboid structure, and comprises a bottom plate and side plates, wherein the side plates and the bottom plate are integrally formed; the open end of aluminum hull casing seals welded fastening with the block, electrolyte filling opening sets up in the center department of bottom plate, seal structure includes sealing nail, sealing nail and electrolyte filling opening can dismantle sealed fastening.
Preferably, the bottom of the positive electrode tab is provided with a positive electrode current collecting disc, the positive electrode current collecting disc and the positive electrode tab are fixed by laser penetration welding, and the center of the positive electrode current collecting disc is provided with a liquid injection hole corresponding to the electrolyte injection hole.
As described above, the lithium ion battery structure of the present utility model has the following beneficial effects: by punching the inner wall to form a groove structure on the basis of the existing aluminum shell, the design of the groove ensures that a small part of electrolyte can contact with the outer wall of the winding core through a flow passage when the electrolyte enters the shell from the beginning under the condition of not affecting the overall structural strength of the aluminum shell, and most of electrolyte is still injected into the middle space of the winding core, and meanwhile, the electrolyte stored at the bottom can also be conveyed to the top of the winding core as much as possible through the flow passage on the shell wall by capillary effect, so that the simultaneous infiltration of the inside and the outside is realized; not only quickening the infiltration time, but also solving the problem of uneven infiltration, realizing a climbing runner of the bottom electrolyte and increasing the storage space of the electrolyte under the condition of not affecting the overall structural strength of the shell, improving the distribution uniformity of the electrolyte after liquid injection, improving the infiltration yield of the battery core, ensuring the final electrical property of the lithium ion battery and ensuring the capacity consistency.
Drawings
Fig. 1 is a schematic diagram showing an exploded structure of the lithium ion battery structure of example 1.
Fig. 2 is a schematic view showing an exploded structure of the cap of example 1.
Fig. 3 is a sectional view showing the mounting structure of the cap and the anode current collecting disk of example 1.
Fig. 4 shows a bottom view of the top cover of embodiment 1.
Fig. 5 shows a top view of the aluminum shell housing of example 1.
Fig. 6 shows a top view of the winding core of example 1.
Description of the reference numerals
1. Cap cap
2. Negative electrode current collecting disc
3. Rolling core
4. Aluminum shell
5. Electrolyte injection port
6. Groove(s)
7. Welding boss
8. Welding groove
9. Top cover
10. Insulating sleeve
11. Negative pole post
12. Insulating stop rack
13. Lightening hole
14. Positive electrode current collecting plate
15. Sealing nail
16. Welded part
17. Bottom plate
18. Side plate
19. Liquid injection hole
Detailed Description
In order to make the objects, features and advantages of the present utility model more comprehensible, the technical solutions in the embodiments of the present utility model are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. 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 the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Unless specifically stated or limited otherwise, the terms "connected," "affixed," "disposed" and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two components can be connected mechanically, directly or indirectly through an intermediate medium, or internally. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
As shown in fig. 1, an embodiment of the present utility model provides a lithium ion battery structure, which includes a cap 1, a negative electrode current collecting disc 2, a winding core 3, a positive electrode current collecting disc 14 and an aluminum shell 4 with a cylindrical structure, wherein the winding core is located in the aluminum shell, one end of the winding core is provided with a negative electrode tab, and the other end is provided with a positive electrode tab; the positive electrode current collecting disc is fixedly connected with the positive electrode lug through laser penetration welding, the upper surface of the negative electrode current collecting disc is fixedly connected with the cap through laser penetration welding, and the lower surface of the negative electrode current collecting disc is fixedly connected with the negative electrode lug through laser penetration welding; the positive electrode tab is fixedly welded with the bottom of the aluminum shell body through laser penetration; an electrolyte injection opening 5 is arranged at the bottom of the aluminum shell, and a sealing structure is arranged at the electrolyte injection opening; the inner wall of the aluminum shell is vertically provided with a plurality of grooves 6 at intervals, as shown in fig. 5, the aluminum shell comprises a bottom plate 17 and a side plate 18, and the side plate and the bottom plate are integrally formed; the grooves are uniformly distributed along the circumferential direction of the aluminum shell body, and the cross section of each groove is provided with a round corner structure. The thickness of the aluminum shell is 0.6mm, and the depth of the groove is 0.12mm. The middle of the negative electrode current collecting disc protrudes upwards to form a welding boss 7, the bottom surface of the cap is inwards sunken to form a welding groove 8, the welding boss is matched with the shape of the welding groove, and the upper surface of the negative electrode current collecting disc and the cap are fixedly welded by laser penetration after being clamped and matched with the welding groove through the welding boss. The aluminum shell is characterized in that the bottom of the aluminum shell is provided with an anode current collecting disc 14, the anode current collecting disc and an anode tab are fixed by laser penetration welding, the aluminum shell is of a cylindrical structure with two ends open, the upper end edge of the aluminum shell is fixed by welding with a sealing cap, the lower end edge of the aluminum shell is fixed by welding with the sealing cap, an electrolyte injection opening 5 is arranged at the center of a bottom plate 17, an electrolyte injection opening 19 is correspondingly arranged at the center of the anode current collecting disc, the sealing structure comprises a sealing nail 15, and the sealing nail and the electrolyte injection opening can be detached and sealed.
As shown in fig. 2 and 3, the cap sequentially comprises a top cover 9, an insulating sleeve 10 and a negative pole 11 which are mutually embedded and fixed from outside to inside, the insulating sleeve is arranged between contact surfaces of the top cover and the negative pole, and the welding groove is arranged on the bottom surface of the negative pole. As shown in fig. 3 and 4, a welding part 16 is formed at the edge of the top cover, the width of the welding part is matched with the thickness of the aluminum shell, and the top cover is welded and fixed with the upper end of the aluminum shell through the welding part; the bottom of top cap is along welding recess outside insulation stop frame 12, insulation stop frame and the slot grafting cooperation that negative pole post, insulating cover and negative pole collector plate formed are equipped with lightening hole 13 in the insulation stop frame, insulation stop frame has two, and along welding recess symmetric distribution. As shown in fig. 6, the winding core is formed by winding a positive plate and a negative plate, and the positive plate and the negative plate are completely isolated by a diaphragm.
Example 2
Embodiment 2 differs from embodiment 1 in that the aluminum shell is of a cuboid structure with two open ends, the thickness of the aluminum shell is 0.5mm, and the depth of the groove is 0.1mm; the number of the insulating stop frames is four, and the insulating stop frames are symmetrically distributed along the welding grooves; the lithium ion battery structure has no positive electrode current collecting disc, the bottom plate and the positive electrode lug are directly welded from the external laser of the aluminum shell body, the rest structures are completely the same, and the risk of short circuit caused by dust entering the winding core can be reduced.
In summary, the groove structure is formed by punching the inner wall of the existing aluminum shell, the groove is designed to enable a small part of electrolyte to contact with the outer wall of the winding core through the flow passage when the electrolyte just enters the shell under the condition that the overall structural strength of the aluminum shell is not affected, and most of electrolyte is still injected into the middle space of the winding core, meanwhile, the electrolyte stored at the bottom can also be conveyed to the top of the winding core as much as possible through the flow passage on the shell wall by the capillary effect, so that the electrolyte is immersed in the inside and outside of the winding core at the same time; not only quickening the infiltration time, but also solving the problem of uneven infiltration, so that under the condition of not affecting the overall structural strength of the shell, the bottom electrolyte climbing runner is realized, the electrolyte storage space is increased, the distribution uniformity of the electrolyte after the electrolyte injection is improved, the infiltration yield of the battery core is improved, the final electrical property of the lithium ion battery is ensured, and the capacity consistency is ensured. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The lithium ion battery structure is characterized by comprising a cap (1), a negative electrode current collecting disc (2), a winding core (3) and an aluminum shell (4), wherein the winding core is positioned in the aluminum shell, one end of the winding core is provided with a negative electrode lug, and the other end of the winding core is provided with a positive electrode lug; the upper surface of the negative electrode current collecting disc is fixedly connected with the cap through laser penetration welding, and the lower surface of the negative electrode current collecting disc is fixedly connected with the negative electrode tab through laser penetration welding; the positive electrode tab is fixedly welded with the bottom of the aluminum shell body through laser penetration; an electrolyte injection opening (5) is formed in the bottom of the aluminum shell, and a sealing structure is arranged on the electrolyte injection opening; a plurality of grooves (6) are vertically arranged on the inner wall of the aluminum shell at intervals.
2. The lithium ion battery structure of claim 1, wherein: the grooves are uniformly distributed along the circumferential direction of the aluminum shell body, and the cross section of each groove is provided with a round corner structure.
3. The lithium ion battery structure of claim 1, wherein: the thickness of the aluminum shell is 0.5-0.7 mm, and the depth of the groove is 0.1-0.15 mm.
4. The lithium ion battery structure of claim 1, wherein: the middle of the negative electrode current collecting disc protrudes upwards to form a welding boss (7), the bottom surface of the cap is inwards sunken to form a welding groove (8), the welding boss is matched with the shape of the welding groove, and the upper surface of the negative electrode current collecting disc and the cap are fixedly welded by laser penetration after being clamped and matched with the welding groove through the welding boss.
5. The lithium ion battery structure of claim 4, wherein: the cap comprises a top cover (9), an insulating sleeve (10) and a negative pole column (11) which are mutually embedded and fixed from outside to inside, the insulating sleeve is arranged between contact surfaces of the top cover and the negative pole column, and the welding groove is arranged on the bottom surface of the negative pole column.
6. The lithium ion battery structure of claim 5, wherein: an insulating stop frame (12) is arranged at the bottom of the top cover along the outer side of the welding groove, and the insulating stop frame is in plug-in fit with a slot formed by the negative pole column, the insulating sleeve and the negative pole current collecting disc.
7. The lithium ion battery structure of claim 6, wherein: the insulating stop frames are internally provided with lightening holes (13), and at least two insulating stop frames are symmetrically distributed along the welding grooves.
8. The lithium ion battery structure of claim 5, wherein: the border of top cap is formed with welded part (16), the width of welded part and the thickness looks adaptation of aluminium shell casing, the top cap passes through welded part and the upper end welded fastening of aluminium shell casing.
9. The lithium ion battery structure of claim 1, wherein: the aluminum shell is of a cylindrical structure or a cuboid structure, and comprises a bottom plate (17) and side plates (18), and the side plates and the bottom plate are integrally formed; the open end of aluminum hull casing seals welded fastening with the block, electrolyte filling opening sets up in the center department of bottom plate, seal structure includes sealing nail (15), sealing nail and electrolyte filling opening can dismantle sealed fastening.
10. The lithium ion battery structure of claim 9, wherein: the bottom of the positive electrode lug is provided with a positive electrode current collecting disc (14), the positive electrode current collecting disc and the positive electrode lug are fixed by laser penetration and welding, and the center of the positive electrode current collecting disc is provided with a liquid injection hole (19) corresponding to the electrolyte injection hole.
CN202311067210.8A 2023-08-23 2023-08-23 Lithium ion battery structure Pending CN117134044A (en)

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