CN218827745U

CN218827745U - Quick-charging lithium battery

Info

Publication number: CN218827745U
Application number: CN202222596211.9U
Authority: CN
Inventors: 郝金权; 吴美雄; 陈国臻
Original assignee: Shenzhen Volt Ampere Bafang New Energy Technology Co ltd
Current assignee: Shenzhen Volt Ampere Bafang New Energy Technology Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-04-07
Anticipated expiration: 2032-09-29

Abstract

The application relates to a fill type lithium cell soon, its technical scheme main points are: the method comprises the following steps: the device comprises a shell, a cover cap, an insulating sleeve, a bus board, a positive plate, a negative plate and a diaphragm; the positive plate is arranged on one side of the diaphragm, the negative plate is arranged on the other side of the diaphragm, and the positive plate, the diaphragm and the negative plate are wound together by taking the positive plate as the inner side to form a battery cell; an insulating gasket is arranged in the shell, and an accommodating cavity is formed by the insulating gasket, the side wall of the shell and the bottom of the shell; the battery core is arranged in the accommodating cavity; electrolyte is filled in the accommodating cavity; a plurality of positive pole lugs are arranged on the positive pole piece; the positive pole lug penetrates through the insulating gasket and then is fixedly connected with the bus board; the bus board is fixedly connected with the cap; the insulating sleeve is sleeved on the outer sides of the lug, the bus plate and the cap; the insulating sleeve is also clamped on the shell; a plurality of negative pole lugs are arranged on the negative pole piece; the negative pole tab is fixedly connected with the shell; this application enlarges the area that can set up negative pole utmost point ear, increases the area of overflowing, can let the heavy current pass through to realize the effect of filling soon.

Description

Quick-charging lithium battery

Technical Field

The utility model relates to a lithium cell technical field, more specifically say, it relates to a fill type lithium cell soon.

Background

Lithium battery, which refers to a battery containing lithium (including metallic lithium, lithium alloy, lithium ion and lithium polymer) in an electrochemical system; lithium batteries can be broadly classified into two types: lithium metal batteries and lithium ion batteries, which do not contain lithium in the metallic state and are rechargeable.

Traditional lithium cell can be at the one end welding positive pole utmost point ear of positive plate, at the one end welding negative pole utmost point ear of negative pole piece, because the position of welding positive pole utmost point ear and negative pole utmost point ear is respectively at the tip of positive plate and negative pole piece, and its area that can weld utmost point ear is less for the quantity of welded utmost point ear is less, and in the actual charging process, the less utmost point ear of welding makes resistance big, and charge time is long, can't realize filling soon.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a fill type lithium cell soon has the area that enlarges and to set up negative pole utmost point ear, increases the overcurrent area, can let the heavy current pass through to realize the function advantage of filling soon.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a fast-charging lithium battery comprising: the device comprises a shell, a cover cap, an insulating sleeve, a bus board, a positive plate, a negative plate and a diaphragm; the positive plate is arranged on one side of the diaphragm, the negative plate is arranged on the other side of the diaphragm, and the positive plate, the diaphragm and the negative plate are wound together by taking the positive plate as the inner side to form a battery cell; an insulating gasket is arranged in the shell, and an accommodating cavity is formed by the insulating gasket, the side wall of the shell and the bottom of the shell; the battery core is arranged in the accommodating cavity; electrolyte is filled in the accommodating cavity; a plurality of positive pole lugs are arranged on the positive pole piece; the positive pole lug penetrates through the insulating gasket and then is fixedly connected with the bus board; the bus board is fixedly connected with the cover cap; the insulating sleeve is sleeved on the outer sides of the lug, the bus plate and the cap; the insulating sleeve is also clamped on the shell; a plurality of negative pole lugs are arranged on the negative pole piece; and the negative pole lug is fixedly connected with the shell.

Optionally, the method further includes: an explosion-proof sheet; the middle part of the bus board is downwards sunken to form a sunken part; the opening end of the concave part faces the cap; the closed end of the concave part is abutted against the insulating gasket; the periphery of the bus board is fixedly connected with the cap; the explosion-proof piece is arranged at the opening of the concave part.

Optionally, a plurality of first through holes are formed in the recessed portion; and the insulating gasket is provided with second through holes which are communicated with the first through holes in a one-to-one correspondence manner.

Optionally, an annular explosion-proof notch is arranged on the explosion-proof sheet to divide the explosion-proof sheet into an explosion-proof inner ring and an explosion-proof outer ring; the explosion-proof outer ring is fixedly connected with the opening of the concave part.

Optionally, the thickness of the explosion-proof inner ring is smaller than that of the explosion-proof outer ring.

Optionally, the positive plate adopts a nanoscale lithium iron phosphate electrode plate.

Optionally, the negative electrode plate is a spherical artificial graphite electrode plate.

To sum up, the utility model discloses following beneficial effect has: through the setting of insulating washer and insulating cover, with anodal utmost point ear, electricity collection board and block are kept apart with the shell, shell and anodal utmost point ear have been realized, the insulation of electricity collection board and block, make to have good insulating nature between shell and the block, the positive plate is in the inboard with the shell contact that also can not because of the coiling of electric core, the good insulating nature of this lithium cell has been guaranteed, be connected with the shell through negative pole utmost point ear is direct, the area that can set up negative pole utmost point ear has been enlarged, the top homoenergetic of every round positive plate in the electric core of coiling can set up a plurality of anodal utmost point ears, all anodal utmost point ears all weld on electricity collection board, setting through a plurality of anodal utmost point ears and a plurality of negative pole utmost point ears, the area of overflowing has been increased, can let the heavy current pass through, thereby realize fast-charging.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a cross-sectional view of the present invention;

fig. 3 is an enlarged schematic view of a portion a in fig. 2.

In the figure: 1. a housing; 2. capping; 3. an insulating sleeve; 4. a bus board; 41. a recessed portion; 42. a first through hole; 5. an electric core; 51. a positive plate; 511. a positive electrode tab; 52. a negative plate; 53. a diaphragm; 6. an insulating spacer; 61. a second through hole; 7. an explosion-proof sheet; 71. explosion-proof nicking; 72. an explosion-proof inner ring; 73. an explosion-proof outer ring.

Detailed Description

In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The present invention will be described in detail with reference to the accompanying drawings and examples.

The utility model provides a fill type lithium cell soon, as shown in fig. 1-3, include: the device comprises a shell 1, a cover cap 2, an insulating sleeve 3, a bus plate 4, a positive plate 51, a negative plate 52 and a diaphragm 53; the positive plate 51 is arranged on one side of the diaphragm 53, the negative plate 52 is arranged on the other side of the diaphragm 53, and the positive plate 51, the diaphragm 53 and the negative plate 52 are wound together with the positive plate 51 as the inner side to form the battery cell 5; an insulating gasket 6 is arranged in the shell 1, and an accommodating cavity is formed by the insulating gasket 6, the side wall of the shell 1 and the bottom of the shell 1; the battery core 5 is arranged in the accommodating cavity; electrolyte is filled in the accommodating cavity; the positive plate 51 is provided with a plurality of positive tabs 511; the positive electrode tab 511 penetrates through the insulating gasket 6 and then is fixedly connected with the bus plate 4; the bus board 4 is fixedly connected with the cover cap 2; the insulating sleeve 3 is sleeved on the outer sides of the lug, the bus plate 4 and the cover cap 2; the insulating sleeve 3 is also clamped on the shell 1; the negative electrode sheet 52 is provided with a plurality of negative electrode tabs; the negative electrode tab is not shown in the figure; and the negative pole lug is fixedly connected with the shell 1.

In practical application, the shell 1 is cylindrical and is matched with a battery core 5 formed by winding, the positive pole lug 511, the bus plate 4 and the cap 2 are connected in sequence, so that the electric connection of the positive pole lug 511, the bus plate 4 and the cap 2 is realized, the cap 2 is made of an insulating material (such as plastics like PP, PE, etc.), the diaphragm 53, the insulating gasket 6 and the insulating sleeve 3 are made of the insulating material, so that the positive plate 51 and the negative plate 52 are isolated, a gap is left between two adjacent circles of the wound battery core 5 to ensure that the positive plate 51 and the negative plate 52 are not in direct contact, the positive pole lug 511, the bus plate 4 and the cover cap 2 are isolated from the shell 1 by the arrangement of the insulating gasket 6 and the insulating sleeve 3, so that the insulation of the shell 1 from the positive pole lug 511, the bus plate 4 and the cover cap 2 is realized, the positive electrode sheet 51, the separator 53 and the negative electrode sheet 52 are wound together with the positive electrode sheet 51 as the inside, the outside of the wound electric core 5 is made to be the negative plate 52, one end of the negative pole tab is fixedly connected with the negative plate 52, the other end is fixedly connected with the shell 1, so that the shell 1 is the negative pole of the lithium battery, and because of the arrangement of the insulating sleeve 3, the shell 1 and the cap 2 have good insulating property, the positive plate 51 is positioned at the inner side of the electric core 5 and can not be contacted with the shell 1 because of winding, thereby ensuring the good insulating property of the lithium battery, the negative pole tab is directly connected with the shell 1, the area for arranging the negative pole tab is enlarged, a plurality of positive pole tabs 511 can be arranged at the top end of each circle of positive pole piece 51 in the wound electric core 5, all the positive pole tabs 511 are welded on the bus plate 4, through the setting of a plurality of positive pole utmost point ears 511 and a plurality of negative pole utmost point ear, increased the overcurrent area, can let the heavy current pass through to realize filling soon.

Further, still include: an explosion-proof sheet 7; the middle part of the bus bar 4 is recessed downwards to form a recessed part 41; the open end of the recess 41 faces the cap 2; the closed end of the recessed portion 41 abuts against the insulating gasket 6; the periphery of the bus board 4 is fixedly connected with the cap 2; the explosion-proof sheet 7 is arranged at the opening of the concave part 41. Specifically, explosion-proof piece 7 is as pressure relief device, and when the inside atmospheric pressure of this lithium cell was too high, explosion-proof piece 7 can break, and timely exhaust reduces atmospheric pressure, avoids the explosion.

Furthermore, a plurality of first through holes 42 are formed on the recess 41; the insulating gasket 6 is provided with second through holes 61 which are correspondingly communicated with the first through holes 42 one by one. Through the setting of first through-hole 42 and second through-hole 61, under the too high condition of the inside atmospheric pressure of lithium cell, gaseous 7 departments of explosion-proof piece that can reachd behind second through-hole 61 and first through-hole 42 in proper order, explosion-proof piece 7 breaks because of the atmospheric pressure is too high for the inside gaseous in time discharge of lithium cell has seted up a plurality of third through-holes that supply gas outgoing on the block 2.

Further, an annular explosion-proof notch 71 is arranged on the explosion-proof sheet 7 to divide the explosion-proof sheet 7 into an explosion-proof inner ring 72 and an explosion-proof outer ring 73; the explosion-proof outer ring 73 is fixedly connected with the opening of the concave part 41. Specifically, through the setting of explosion-proof nick 71 for explosion-proof piece 7 is thinner at the thickness that explosion-proof nick 71 goes out, and under the too high condition of lithium cell inside atmospheric pressure, explosion-proof piece 7 can break from explosion-proof nick 71, sets up explosion-proof nick 71 annularly, compares in linear nick, when making explosion-proof piece 7 break, and explosion-proof inner circle 72 can break away from with explosion-proof outer lane 73, and the opening of formation is great, and gas discharge effect is better.

Further, the thickness of the explosion-proof inner ring 72 is smaller than that of the explosion-proof outer ring 73. The thickness of the explosion-proof inner ring 72 is smaller than that of the explosion-proof outer ring 73, so that the firmness of the explosion-proof inner ring 72 is smaller than that of the explosion-proof outer ring 73, and the explosion-proof inner ring 72 is easier to break at the explosion-proof nicks 71 due to overhigh air pressure inside the lithium battery.

Further, the positive plate 51 is a nanoscale lithium iron phosphate electrode plate; the negative electrode sheet 52 is a spherical artificial graphite electrode sheet. In particular, the spherical artificial graphite has high-rate charge and discharge performance. The lithium iron phosphate is used as the anode material, can be charged at a high rate, has the characteristics of large discharge capacity, low price and no environmental pollution, and the nanoscale lithium iron phosphate electrode plate is used, and has the advantages of fine and uniform particles, so that the specific surface area of the material is greatly increased, the diffusion rate of electrons is increased, and the electrode plate is suitable for high-current charge and discharge to realize the quick charge function.

The utility model discloses a fill type lithium cell soon, setting through insulating gasket 6 and insulating cover 3, with anodal utmost point ear 511, electricity collection board 4 and block 2 keep apart with shell 1, shell 1 and anodal utmost point ear 511, electricity collection board 4 and block 2's insulation has been realized, make to have good insulating nature between shell 1 and the block 2, positive plate 51 is in electric core 5 inboard also can not contact with shell 1 because of the coiling, the good insulating nature of this lithium cell has been guaranteed, directly be connected with shell 1 through negative pole utmost point ear, the area that can set up negative pole utmost point ear has been enlarged, the top homoenergetic of positive plate 51 of each circle can set up a plurality of anodal utmost point ears 511 in the electric core 5 of coiling, all anodal utmost point ears 511 all weld on electricity collection board 4, through the setting of a plurality of anodal utmost point ears 511 and a plurality of negative pole utmost point ears, the overcurrent area has been increased, can let the heavy current pass through, thereby realize filling soon.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A fast-charging lithium battery comprising: the device comprises a shell, a cover cap, an insulating sleeve, a bus board, a positive plate, a negative plate and a diaphragm; the positive plate is arranged on one side of the diaphragm, the negative plate is arranged on the other side of the diaphragm, and the positive plate, the diaphragm and the negative plate are wound together by taking the positive plate as the inner side to form a battery cell; an insulating gasket is arranged in the shell, and an accommodating cavity is formed by the insulating gasket, the side wall of the shell and the bottom of the shell; the battery core is arranged in the accommodating cavity; electrolyte is filled in the accommodating cavity; a plurality of positive pole lugs are arranged on the positive pole piece; the positive pole lug penetrates through the insulating gasket and then is fixedly connected with the bus board; the bus board is fixedly connected with the cover cap; the insulating sleeve is sleeved on the outer sides of the lug, the bus plate and the cap; the insulating sleeve is also clamped on the shell; a plurality of negative pole lugs are arranged on the negative pole piece; and the negative pole lug is fixedly connected with the shell.

2. A fast-charging lithium battery as claimed in claim 1, further comprising: an explosion-proof sheet; the middle part of the bus board is downwards sunken to form a sunken part; the opening end of the concave part faces the cap; the closed end of the concave part is abutted against the insulating gasket; the periphery of the bus board is fixedly connected with the cap; the explosion-proof piece is arranged at the opening of the concave part.

3. The fast-charging lithium battery of claim 2 wherein the recessed portion defines a plurality of first through holes; and the insulating gasket is provided with second through holes which are communicated with the first through holes in a one-to-one correspondence manner.

4. The fast-charging lithium battery of claim 3 wherein the explosion-proof sheet is provided with an annular explosion-proof score dividing the explosion-proof sheet into an explosion-proof inner ring and an explosion-proof outer ring; the explosion-proof outer ring is fixedly connected with the opening of the concave part.

5. The fast-charging lithium battery as claimed in claim 4, wherein the thickness of the explosion-proof inner ring is smaller than that of the explosion-proof outer ring.

6. The lithium battery of any one of claims 1-5, wherein the positive electrode sheet is a nanoscale lithium iron phosphate electrode sheet.

7. The fast-charging lithium battery as claimed in claim 1, wherein the negative electrode sheet is a spherical artificial graphite electrode sheet.