CN218632369U

CN218632369U - High-power high-specific energy cylindrical battery

Info

Publication number: CN218632369U
Application number: CN202223187545.7U
Authority: CN
Inventors: 高剑; 韩洪川; 赵方辉; 李小龙
Original assignee: Sichuan Qiruike Technology Co Ltd; Sichuan Changhong Electronic Holding Group Co Ltd
Current assignee: Sichuan Qiruike Technology Co Ltd; Sichuan Changhong Electronic Holding Group Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-14
Anticipated expiration: 2032-11-30
Also published as: CN218632369U8

Abstract

The utility model discloses a high-power high specific energy cylindrical battery, including the book core that is formed by electrode slice coiling, the electrode slice comprises positive plate, negative plate and the diaphragm that sets up between positive plate and negative plate, all is equipped with utmost point ear on positive plate and the negative plate, positive plate ear includes the first positive plate ear that sets up near the book core coiling head and the second positive plate ear that sets up near the book core coiling afterbody, the width of first positive plate ear is greater than the width of second positive plate ear, the thickness of first positive plate ear is greater than the thickness of second positive plate ear; the negative pole ear is including setting up the first negative pole ear of the head department of coiling core coiling and setting up the second negative pole ear of the tail department of coiling core coiling, and the width of first negative pole ear is greater than the width of second negative pole ear, and the thickness of first negative pole ear is greater than the thickness of second negative pole ear. The utility model discloses can be favorable to conducting away the heat of rolling up the core inlayer fast through wideer thicker utmost point ear to reduce the inside heat gathering of roll core.

Description

High-power high-specific energy cylindrical battery

Technical Field

The utility model belongs to the technical field of the battery technique and specifically relates to a high specific energy cylinder battery of high power.

Background

The cylindrical battery has the advantages of high capacity, long cycle life and the like, and compared with the common cylindrical battery, the cylindrical battery with high power and high specific energy has better performance. The development of high power high specific energy cylindrical batteries requires the improvement of the electrical and thermal conductivity of the cell without adding excessive inactive components.

In the existing industry, the electric conduction and heat conduction capabilities of a high-power high-specific-energy cylindrical battery are improved by increasing the number of tabs and the diameter and length of an electric core, but the heat in the electric core is seriously accumulated; increase utmost point ear quantity and can be because of the position stress difference of welding utmost point ear and the position of not welding utmost point ear, along with going on of cylinder battery charge-discharge cycle, the electrode slice takes place to expand and contract, and the lithium is analysed to the position that stress changes takes place easily, appears the cracked condition of electrode slice and leads to the decay of battery capacity even, finally leads to the fact the reduction of cylinder battery charge-discharge cycle life.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the high-power high-specific energy cylindrical battery is provided, and the cylindrical battery can be ensured to have good heat dissipation capacity and electric conduction capacity while the power and the capacity of the cylindrical battery are improved.

In order to solve the technical problem the utility model discloses the technical scheme who adopts is: the high-power high-specific energy cylindrical battery comprises a winding core formed by winding an electrode plate, wherein the winding core is arranged in a battery steel shell, the electrode plate consists of an anode plate, a cathode plate and a diaphragm arranged between the anode plate and the cathode plate, the anode plate and the cathode plate are respectively provided with a tab, the tabs comprise an anode tab arranged on the edge of the anode plate and a cathode tab arranged on the edge of the cathode plate, the anode tabs comprise a first anode tab arranged close to the winding head of the winding core and a second anode tab arranged close to the winding tail of the winding core, the width of the first anode tab is greater than that of the second anode tab, and the thickness of the first anode tab is greater than that of the second anode tab; the negative pole ear is including setting up the first negative pole ear of the head department of coiling the core and setting up the second negative pole ear of the afterbody department of coiling the core, and the width of first negative pole ear is greater than the width of second negative pole ear, and the thickness of first negative pole ear is greater than the thickness of second negative pole ear.

Further, the method comprises the following steps: the first negative pole lug and the second negative pole lug are bent towards the bottom of the battery steel shell, the second negative pole lug is attached to the first negative pole lug, and the first negative pole lug is attached to the bottom of the battery steel shell.

Further, the method comprises the following steps: the first negative pole lug and the second negative pole lug are both copper-nickel composite lugs, the surfaces of the first negative pole lug and the second negative pole lug which are in mutual contact are both copper metal surfaces, and the surfaces of the first negative pole lug and the second negative pole lug which are not in mutual contact are both nickel metal surfaces.

Further, the method comprises the following steps: the first positive lug and the second positive lug are both aluminum lugs.

Further, the method comprises the following steps: the roll core is a cylindrical roll core, and the positive electrode lug and the negative electrode lug are respectively positioned at two ends of the roll core.

Further, the method comprises the following steps: the distance between the first positive tab and the winding head of the winding core is one third of the total length of the positive plate, and the distance between the second positive tab and the winding head of the winding core is two thirds of the total length of the positive plate.

Further, the method comprises the following steps: the lengths of the first positive tab and the second negative tab are one third of the axial length of the winding core; the length of the first negative electrode tab and the length of the second negative electrode tab are both one third of the axial length of the winding core.

Further, the method comprises the following steps: the sum of the length of the connecting part of the positive tab and the positive plate and the length of the connecting part of the negative tab and the negative plate is less than the width of any one of the pole pieces.

The utility model has the advantages that: the utility model discloses improve the structure of cylinder battery, optimize the size of the positive pole ear and the negative pole ear of specific site, through setting up the width and the thickness of the utmost point ear that lie in roll core inside to be greater than the width and the thickness of the utmost point ear that lie in roll core periphery part, can be favorable to conducting away the heat of roll core inlayer through the utmost point ear of wideer thicker fast to reduce the heat gathering inside the roll core; and the size of the tab positioned on the outer layer of the winding core is reduced, so that the occupation ratio of the inactive substances can be reduced, the energy density of the cylindrical battery can be improved, and the conductive capacity of the cylindrical battery can be improved.

Drawings

Fig. 1 is a front view of the present invention;

fig. 2 is a side view of the present invention;

fig. 3 is a top view of the present invention;

fig. 4 is a schematic view of the electrode plate in the present invention in an expanded state;

fig. 5 is a schematic view of the expanded state of the positive plate of the present invention;

fig. 6 is a schematic diagram of the expanded state of the cathode plate of the present invention.

Labeled as: 100-roll core, 200-positive plate, 300-negative plate, 400-diaphragm, 510-first positive tab, 520-second positive tab, 610-first negative tab, 620-second negative tab.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be further described with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "front", "back", "left", "right", "upper", "lower", "inner", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the device or component to be referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 3, the high power and high specific energy cylindrical battery of the present invention includes a winding core 100 and a tab, wherein the winding core 100 is disposed in a steel shell of the battery; the winding core 100 is formed by winding an electrode sheet, and the tab is provided on the electrode sheet. As shown in fig. 4 to 6, the electrode sheet of the present invention is composed of a positive electrode sheet 200, a negative electrode sheet 300 and a separator 400, wherein the positive electrode sheet 200 and the negative electrode sheet 300 respectively cover two side surfaces of the separator 400, so as to form an electrode sheet in which the separator 400 is located between the positive electrode sheet 200 and the negative electrode sheet 300. The electrode tabs on the electrode plates comprise positive electrode tabs and negative electrode tabs, and the polarities of the positive electrode tabs and the negative electrode tabs are opposite; the positive tab is fixed on the positive plate in a welding mode, and the negative tab is fixed on the negative plate in the same welding mode.

As shown in fig. 5, the present invention employs two positive electrode tabs, and the two positive electrode tabs are spaced apart from each other in the length direction of the positive electrode sheet 200. When the electrode sheet is wound into the winding core 100, the first positive electrode tab 510 is close to the center of the winding core 100 and the second positive electrode tab 520 is close to the outer periphery of the winding core 100, as shown in fig. 1 and 2, the positive electrode tab near the winding head end of the positive electrode sheet 200 is set as the first positive electrode tab 510 and the positive electrode tab near the winding tail end of the positive electrode sheet 200 is set as the second positive electrode tab 520. The utility model discloses the width of well injecing first positive plate 510 is greater than the width of the positive plate 520 of second, and the thickness of first positive plate 510 is greater than the thickness of the positive plate 520 of second simultaneously.

As shown in fig. 6, the present invention employs two negative electrode tabs, and the two negative electrode tabs are spaced apart from each other in the length direction of the negative electrode sheet 300. When the negative electrode tab disposed at the winding head of the negative electrode sheet 300 is set as a first negative electrode tab 610 and the negative electrode tab disposed at the winding tail of the negative electrode sheet 300 is set as a second negative electrode tab 620, as shown in fig. 1 and 2, after the electrode sheet is wound into the winding core 100, the first negative electrode tab 610 is close to the center of the winding core 100 and the second negative electrode tab 620 is close to the outer periphery of the winding core 100. The utility model discloses in inject the width of first negative pole piece 610 and be greater than the width of second negative pole piece 620, the thickness of first negative pole piece 610 is greater than the thickness of second negative pole piece 620 simultaneously.

After adopting above-mentioned optimization scheme of structure and position to adjusting utmost point ear and negative pole ear, the cylinder battery discharges in-process because of the existence of impedance produced and gather can the very first time transmit for being close to the first positive plate 510 and the first negative pole piece 610 of rolling core 100 inside at the heat of rolling core 100 inside, because the great and thickness of the size of first positive plate 510 and first negative pole piece 610 is thicker, the heat has bigger transfer space and transfer path, thermal transmission is more efficient, thereby can make the heat of the inside gathering of rolling core 100 transmit to the cylinder battery outside fast, reduce the inside heat gathering of rolling core 100, the power performance of battery is improved. The heat at the winding core layer positioned at the outer layer of the winding core 100 can be directly transferred to the battery steel shell, and then the heat is dissipated through the large-area peripheral surface of the battery steel shell, so that the width and the thickness of the second positive plate 520 and the second negative plate 620 which are close to the periphery of the winding core 100 do not need to be increased; also, reducing the size of the second positive electrode tab 520 and the second negative electrode tab 620 can also reduce the proportion of inactive materials, thereby improving the energy density of the cylindrical battery.

As shown in fig. 1, in the present invention, the first negative electrode tab 610 and the second negative electrode tab 620 are both bent toward the bottom of the battery steel shell, the second negative electrode tab 620 is attached to the first negative electrode tab 610, and the first negative electrode tab 610 is attached to the bottom of the battery steel shell. The material of the tabs is limited, the first negative tab 610 and the second negative tab 620 are both copper-nickel composite tabs, the surfaces of the first negative tab 610 and the second negative tab 620, which are in contact with each other, are both copper metal surfaces, and the surfaces of the first negative tab 610 and the second negative tab 620, which are not in contact with each other, are both nickel metal surfaces; the first positive tab 510 and the second positive tab 520 are both aluminum tabs. On the basis of the basic conductive work of the cylindrical battery, the heat transfer efficiency between the lug and the battery steel shell can be accelerated, so that the heat dissipation effect of the interior of the winding core 100 is further improved. Meanwhile, the welding of the electrode lug is convenient to carry out, so that the electrode lug and the electrode plate are firmly welded, and the condition of insufficient welding is avoided.

In order to slow down the decline of cylinder battery performance, the utility model discloses on the basis of the cylindrical book core that adopts the electrode slice to convolute the formation, set up anodal ear and negative pole ear respectively at the both ends of rolling up core 100 to can the whole stress of rolling up core 100 inside of the try best balance.

Specifically, the utility model discloses well adjust utmost point ear and negative pole ear set up the optimization of position still include: as shown in fig. 5, the first positive tab 510 is disposed at a distance of one-third of the total length of the positive electrode tab 200 from the winding head of the winding core 100, and the second positive tab 520 is disposed at a distance of one-third of the total length of the positive electrode tab 200 from the winding head of the winding core 100; as shown in fig. 6, the first negative electrode tab 610 is provided directly at the winding head of the winding core 100, and the second negative electrode tab 620 is provided directly at the winding tail of the winding core 100. Setting the length of the first positive tab 510 and the second negative tab 620 to be one third of the axial length of the winding core 100; the lengths of the first negative electrode tab 610 and the second negative electrode tab 620 are set to be one third of the axial length of the winding core 100. In addition, the method also comprises the step of limiting the sum of the length of the joint part of the positive electrode tab and the positive electrode sheet and the length of the joint part of the negative electrode tab and the negative electrode sheet to be smaller than the width of any pole piece, namely the width of the pole piece with the smallest width.

When preparing the above cylindrical battery with high power and high specific energy of the utility model, the process is carried out according to the following steps:

step one, preparing anode slurry and cathode slurry. Respectively and uniformly stirring the positive electrode active substance and the negative electrode active substance with a conductive agent, a bonding agent, a solvent and the like to prepare slurry with proper viscosity.

And step two, coating the positive electrode and the negative electrode. And respectively filling the positive slurry and the negative slurry into a trough of a coating machine, and setting parameters of coating thickness, coating length, white leaving length, coating speed, baking temperature and baking air frequency according to process requirements. And after the front side and the back side are coated in sequence, rolling and placing the coated film into a vacuum oven for baking.

And step three, rolling the pole pieces and the cut pieces. Setting parameters of a roller press according to the designed compaction density of the battery cell, and rolling the baked pole piece in the step by a roller; rolling the positive electrode once and rolling the negative electrode twice; then cutting into pieces for later use.

And step four, preparing the positive plate and the negative plate. Welding an aluminum tab with the width dimension of 4-6 mm, the thickness dimension of 0.08-0.15 mm and the length dimension of one third of the total length of the winding core on the positive plate close to one third of the winding head; welding an aluminum tab with the width dimension of 3-5 mm, the thickness dimension of 0.07-0.10 mm and the length dimension of one third of the total length of the winding core on the positive plate close to two thirds of the winding head; welding a copper-nickel composite tab with the width dimension of 4-6 mm, the thickness dimension of 0.08-0.15 mm and the length dimension of one third of the total length of the winding core at the winding head of the negative plate; and welding the copper-nickel composite tab with the width dimension of 3-5 mm, the thickness dimension of 0.07-0.10 mm and the length dimension of one third of the total length of the winding core at the winding tail part of the negative plate.

And step five, assembling. And winding the prepared positive plate and the prepared negative plate together with the diaphragm into a cylindrical winding core, then installing the lower gasket, placing the lower gasket into a battery steel shell, welding the lower gasket and the battery steel shell firmly, installing the upper gasket and the rolling groove, welding a cap, and then sequentially baking, injecting liquid and sealing.

And step six, post-treatment. Cleaning and oiling the sealed cylindrical battery, sleeving a protective film on the cylindrical battery, and then labeling the cylindrical battery; and finally, pre-charging, high-temperature aging, formation and capacity-dividing offline are sequentially completed.

Claims

1. High power high specific energy cylinder battery, include and roll up core (100) that form by the electrode slice coiling, roll up core (100) and set up in the battery steel casing, the electrode slice comprises positive plate (200), negative pole piece (300) and diaphragm (400) of setting between positive plate (200) and negative pole piece (300), all is equipped with utmost point ear on positive plate (200) and negative pole piece (300), utmost point ear is including setting up the positive ear on positive plate (200) limit portion and setting up the negative pole ear on negative pole piece (300) limit portion, its characterized in that: the positive lug comprises a first positive lug (510) and a second positive lug (520), the first positive lug is arranged close to the winding head of the winding core (100), the second positive lug is arranged close to the winding tail of the winding core (100), the width of the first positive lug (510) is larger than that of the second positive lug (520), and the thickness of the first positive lug (510) is larger than that of the second positive lug (520); the negative electrode tab comprises a first negative electrode tab (610) arranged at the winding head of the winding core (100) and a second negative electrode tab (620) arranged at the winding tail of the winding core (100), the width of the first negative electrode tab (610) is larger than that of the second negative electrode tab (620), and the thickness of the first negative electrode tab (610) is larger than that of the second negative electrode tab (620).

2. The high power, high specific energy cylindrical battery of claim 1, wherein: the first negative pole lug (610) and the second negative pole lug (620) are bent towards the bottom of the battery steel shell, the second negative pole lug (620) is attached to the first negative pole lug (610), and the first negative pole lug (610) is attached to the bottom of the battery steel shell.

3. The high power, high specific energy cylindrical battery of claim 2, wherein: the first negative electrode tab (610) and the second negative electrode tab (620) are both copper-nickel composite tabs, the surfaces of the first negative electrode tab (610) and the second negative electrode tab (620) which are in mutual contact are both copper metal surfaces, and the surfaces of the first negative electrode tab (610) and the second negative electrode tab (620) which are not in mutual contact are both nickel metal surfaces.

4. The high power high specific energy cylindrical battery of claim 1, wherein: the first positive tab (510) and the second positive tab (520) are both aluminum tabs.

5. The high power high specific energy cylindrical battery of claim 1, wherein: the winding core (100) is a cylindrical winding core, and the positive electrode lug and the negative electrode lug are respectively positioned at two ends of the winding core (100).

6. The high power high specific energy cylindrical battery of claim 1, wherein: the distance between the first positive tab (510) and the winding head of the winding core (100) is one third of the total length of the positive plate (200), and the distance between the second positive tab (520) and the winding head of the winding core (100) is two thirds of the total length of the positive plate (200).

7. The high power, high specific energy cylindrical battery of claim 1, wherein: the lengths of the first positive tab (510) and the second negative tab (620) are one third of the axial length of the winding core (100); the length of the first negative electrode tab (610) and the length of the second negative electrode tab (620) are both one third of the axial length of the winding core (100).

8. The high power high specific energy cylindrical battery of any one of claims 1 to 7, wherein: the sum of the length of the connecting part of the positive electrode tab and the positive plate and the length of the connecting part of the negative electrode tab and the negative plate is less than the width of any one of the pole pieces.