CN107394098B - Method for preparing lithium ion battery by using winding body battery cell - Google Patents

Method for preparing lithium ion battery by using winding body battery cell Download PDF

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CN107394098B
CN107394098B CN201710574763.0A CN201710574763A CN107394098B CN 107394098 B CN107394098 B CN 107394098B CN 201710574763 A CN201710574763 A CN 201710574763A CN 107394098 B CN107394098 B CN 107394098B
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tab
positive
negative pole
winding
pole piece
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CN107394098A (en
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袁正秋
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Jiangsu Chunlan Clean Energy Research Institute Co ltd
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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a method for preparing a lithium ion battery by adopting a multi-tab winding body battery cell, which comprises the following steps of firstly, uniformly coating active slurry on a positive electrode aluminum or negative electrode copper current collector, and reserving an uncoated empty foil area in the vertical direction of the coating direction; then determining the position of each tab, and punching out the corresponding tab in a reserved empty foil area by using a cutting die to manufacture positive and negative pole pieces of the multi-tab; winding around a winding needle with the set winding needle width according to the placing sequence of the isolating film, the negative pole piece, the isolating film and the positive pole piece to prepare a multi-tab winding body of the battery cell, and preparing a winding body battery cell with each layer of tab output, wherein the anode tab is overlapped with the cathode tab; thirdly, welding a positive electrode aluminum tab and a negative electrode copper tab of the prepared multi-tab winding body battery cell, and leading out a nickel tab and a copper nickel-plated tab; filling the aluminum-plastic composite membrane into a punched aluminum-plastic membrane, performing top and side sealing, injecting electrolyte, performing primary sealing, standing, forming, performing secondary sealing, and performing volume division to prepare the lithium ion battery.

Description

Method for preparing lithium ion battery by using winding body battery cell
Technical Field
The invention relates to a method for preparing a lithium ion battery by using a winding body battery cell.
Background
The lithium ion battery has the advantages of high voltage, high power, long service life, no pollution and the like, quickly meets the requirements of microelectronics and environmental protection, and provides higher requirements for the multiplying power performance of the lithium ion battery in the existing markets such as model airplane aerial photography, automobile starting and stopping, electric automobiles and the like. However, the traditional single-pole ear design seriously restricts the exertion and improvement of a discharge platform of the lithium ion battery and seriously reduces the output power density of the battery; meanwhile, the single-pole lug design battery has high internal resistance, and can generate a large amount of physical heat and chemical heat during heavy current discharge, so that the temperature of the battery rises sharply, and the internal electrolyte can be splashed seriously, even can be combusted and exploded. Therefore, in order to improve the high-rate discharge characteristic and the use safety of the lithium ion battery, the multi-tab structure design is usually adopted, and two cell structures are adopted in the design of the multi-tab cell of the existing polymer lithium ion battery: the laminated structure comprises a laminated structure and a winding structure, wherein each pole piece is punched by a corresponding positive pole piece cutting die or a negative pole piece cutting die; each pole piece is punched with a tab. Difficulty of lamination: 1. the precision requirement on lamination equipment is very high, and dislocation cannot occur when the positive and negative diaphragms are laminated; 2. if the positive and negative electrodes are staggered, namely the negative electrode film area cannot completely cover the positive electrode film area, the common X-Ray detection technology is difficult to use for pre-detection and alarming, and effective risk management and control cannot be achieved. In the winding structure, the positive and negative diaphragms of the battery respectively have only one pole piece, and the positive and negative diaphragms are separated by an isolating film and then rotate around the rotating core layer by layer during winding; the electrode lugs of each layer are punched and cut out of blank current collectors reserved in the coating width direction during coating. The characteristics of the winding structure: 1. the winding equipment is simple, the technology is mature, and the dislocation phenomenon that the cathode film region can not wrap the anode film region is difficult to occur; 2. the membrane area dislocation appears, and the prior detection and the alarm are easily carried out by using the common X-Ray detection technology to control the risk. Difficulty of multi-tab winding structure: in the winding body, the width of the inner layer segment is narrow, the width of the outer layer segment is relatively wide, and the distance between the lugs on the inner layer and the outer layer is continuously increased and is not a fixed value; in order to ensure that each layer of positive electrode tab or each layer of negative electrode tab of the wound body can be overlapped, the precise position of the tab punching on each layer from the inside to the outside of the winding core needs to be carefully considered. The existing method is that an engineer determines the punching position of each layer of tab according to own working experience and continuous manual debugging in the sample preparation process: 1. the method is too dependent on the experience of engineers and the understanding of engineers on the process capability of the equipment; 2. meanwhile, the accurate determination of the positions of the multiple tabs needs continuous trial and error and adjustment, the period is too long, the production efficiency is reduced, the product development period is prolonged, and the purpose of pre-design cannot be achieved; 3. the design of multi-tab electric cores of various types cannot be faced, the workload is higher, and the time consumption is longer; 4. accuracy cannot be guaranteed. In the multi-tab winding structure, the accurate positioning of the tab position is crucial, if the tab position cannot be accurately positioned, the tabs on adjacent layers are dislocated when the pole piece is wound, the dislocation is more serious along with the increase of the number of wound layers, the center distance of the tabs is affected, and even the phenomenon of tab 'fence' can occur, so that the final winding body is scrapped.
Disclosure of Invention
The invention provides a method for preparing a lithium ion battery by using a winding body battery cell, which can prepare a high-rate polymer winding type lithium ion battery.
The invention adopts the following technical scheme: a method for preparing a lithium ion battery by adopting a multi-tab winding body battery cell comprises the following steps: the method comprises the following steps of firstly, preparing positive and negative pole pieces, wherein the manufacturing method of the positive and negative pole pieces comprises the following steps: firstly, uniformly coating active slurry on a positive electrode aluminum or negative electrode copper current collector, and reserving an uncoated empty foil area in the vertical direction of the coating direction; then determining the position of each tab, and punching out the corresponding tab in a reserved empty foil area by using a cutting die to manufacture positive and negative pole pieces of the multi-tab; winding around a winding needle with the set winding needle width to manufacture a multi-tab winding body of the battery cell according to the placing sequence of the isolating film, the negative pole piece, the isolating film and the positive pole piece, and manufacturing a winding body battery cell with each layer of tab of which the positive pole tab is overlapped and the negative pole tab is overlapped; welding a positive electrode aluminum tab and a negative electrode copper tab of the prepared multi-tab winding body battery cell, and then respectively leading out a nickel tab and a copper nickel-plated tab; then, the lithium ion battery is filled into a punched aluminum-plastic film, and the lithium ion battery is prepared by respectively carrying out top side sealing, electrolyte injection, primary sealing, standing, formation, secondary sealing and capacity grading.
And in the second step, the negative pole piece comprises each layer of lug obtained by die-cutting and reserving blank copper foil through a cutting die after accurate positioning and electrode active substances coated on the copper foil, the negative pole piece before die-cutting is manufactured in a mode that negative active slurry is uniformly coated on a negative copper current collector, an uncoated blank copper foil area with a proper width is reserved in the direction vertical to the coating direction, and a plurality of lugs are formed by die-cutting the blank copper foil area, which is left with one side of the copper foil and is not coated with the electrode active substances, of the copper foil through follow-up.
And step two, the positive pole piece comprises each layer of tabs obtained by die cutting and reserving blank aluminum foils through a cutting die after accurate positioning and electrode active substances coated on the aluminum foils, the positive pole piece before die cutting is manufactured in a mode that positive active slurry is uniformly coated on a positive aluminum current collector, an uncoated blank aluminum foil area with a proper width is reserved in the vertical direction of the coating direction, and a plurality of tabs are formed in the blank aluminum foil area, which is left on one side of the aluminum foil and is not coated with the electrode active substances, through subsequent die cutting to serve as the positive current collector. In order to maximize the use of space, i.e. to contain as much energy as possible in a certain space. And (3) leaving a blank aluminum foil area at the tail part of the positive pole piece so as to carry out winding ending by using the positive aluminum foil. And in the winding mode in the second step, the first layer of the positive pole piece is placed at the position of the second layer of the negative pole piece in a mode that the negative pole wraps the positive pole, and then winding is carried out around a winding needle. Coating the coating area of the negative electrode on the positive electrode, wherein the length of the coating area of the negative electrode depends on the length of the coating area of the positive electrode, the coating length of the positive electrode can be calculated in advance according to the designed capacity, the pole piece surface density and the compaction, and then the surface A and the surface B are allocated according to the following calculation formula:
we introduce l belownI.e. the length of the pole pieces of n layers, the algorithm may be as follows: ln=Ln+1-Ln-1；
Length of anode coating A face
Figure 273281DEST_PATH_IMAGE002
;
Length of positive electrode coating B face
Figure 377372DEST_PATH_IMAGE004
;
Total length of positive electrode coating region
Figure 157110DEST_PATH_IMAGE006
，
The lengths of the two sides of the corresponding negative pole piece are equal and are all
Figure 552319DEST_PATH_IMAGE008
Wherein
Figure 304374DEST_PATH_IMAGE010
The excess of the cathode and the anode is called safety margin; wherein the total length of the anode aluminum foil is
Figure 126837DEST_PATH_IMAGE012
。
The invention has the following beneficial effects: after the technical scheme is adopted, the lithium ion battery with the high-rate polymer can be prepared, the overlap ratio of the positive electrode lug and the negative electrode lug of the battery is very good, the preparation method is simple, and the rejection rate of battery production is reduced.
Detailed Description
The invention relates to a method for preparing a lithium ion battery by adopting a multi-tab winding body battery cell, which comprises the following steps:
the method comprises the following steps of firstly, preparing positive and negative pole pieces, wherein the manufacturing method of the positive and negative pole pieces comprises the following steps: firstly, uniformly coating active slurry on a positive electrode aluminum or negative electrode copper current collector, and reserving an uncoated empty foil area in the vertical direction of the coating direction; then determining the position of each tab, and punching out the corresponding tab in a reserved empty foil area by using a cutting die to manufacture positive and negative pole pieces of the multi-tab;
winding around a winding needle with the set winding needle width to manufacture a multi-tab winding body of the battery cell according to the placing sequence of the isolating film, the negative pole piece, the isolating film and the positive pole piece, and manufacturing a winding body battery cell with each layer of tab of which the positive pole tab is overlapped and the negative pole tab is overlapped;
welding a positive electrode aluminum tab and a negative electrode copper tab of the prepared multi-tab winding body battery cell, and then respectively leading out a nickel tab and a copper nickel-plated tab; then, the lithium ion battery is filled into a punched aluminum-plastic film, and the lithium ion battery is prepared by respectively carrying out top side sealing, electrolyte injection, primary sealing, standing, formation, secondary sealing and capacity grading.
The negative pole piece in the second step comprises each layer of tabs obtained by die-cutting and reserving blank copper foil through a cutting die after accurate positioning and electrode active substances coated on the copper foil, the negative pole piece before die-cutting is manufactured in a mode that negative active pulp is uniformly coated on a negative copper current collector, an uncoated blank copper foil area with proper width is reserved in the vertical direction of the coating direction, a plurality of tabs are formed in a subsequent die-cutting mode in a blank copper foil area with one side of the copper foil not coated with the electrode active substances and serve as a negative current collector, the positive pole piece in the second step comprises each layer of tabs obtained by die-cutting and reserving blank aluminum foil through the cutting die after accurate positioning and electrode active substances coated on the aluminum foil, the positive active pulp is uniformly coated on a positive aluminum current collector, and an uncoated blank aluminum foil area with proper width is reserved in the vertical direction of the coating direction, and a blank aluminum foil area with one side of the aluminum foil not coated with the electrode active substance is subjected to subsequent die cutting to form a plurality of tabs serving as the positive electrode current collector. In order to maximally utilize the space, namely, a certain space is filled with energy as much as possible, the head parts of the positive pole piece and the negative pole piece are provided with no blank foil area, a blank aluminum foil area is reserved at the tail part of the positive pole piece so as to use the positive aluminum foil to carry out winding ending, the winding mode in the step two is that a negative pole wraps the positive pole, the first layer of the positive pole piece is placed at the position of the second layer of the negative pole piece, then winding is carried out around a winding needle, the coating of the negative pole coating area is carried out on the principle that the positive pole is coated on the negative pole, the length of the coating area of the negative pole depends on the length of the coating area of the positive pole, the coating length of the positive pole can be pre-calculated according to the designed capacity, the density of the pole piece surface and the compaction, and then the:
we introduce l belownI.e. the length of the pole pieces of n layers, the algorithm may be as follows: ln=Ln+1-Ln-1；
Length of anode coating A face
Figure 393870DEST_PATH_IMAGE002
;
Length of positive electrode coating B face
Figure 592770DEST_PATH_IMAGE004
;
Total length of positive electrode coating region
Figure 950064DEST_PATH_IMAGE006
，
The lengths of the two sides of the corresponding negative pole piece are equal and are all
Figure 943428DEST_PATH_IMAGE008
Wherein
Figure 697758DEST_PATH_IMAGE010
The excess of the cathode and the anode is called safety margin; wherein the total length of the anode aluminum foil is
Figure 434769DEST_PATH_IMAGE012
。
The method for accurately positioning the tab position of the multi-tab winding type lithium ion battery comprises the following steps of:
step one, when a multi-tab winding core is wound, establishing an ideal physical model for tab positioning;
step two, deducing a uniform mathematical expression form of each layer of tab according to the ideal physical model established in the step one;
introducing actual conditions to the physical model, introducing correction factors into the unified mathematical expression, and performing numerical correction to the final mathematical expression;
step four, taking the position number of the pole lug as an independent variable, substituting the design parameters under the actual working condition into a final mathematical expression to calculate the accurate position of each pole lug, wherein the design parameters comprise the center distance of the pole lug, the width of a winding needle, a deviation-correcting factor, the thicknesses of a positive pole piece and a negative pole piece and the thickness of an isolation film, the ideal physical model in the step one is set as a runway model, the runway model assumes that each layer of a final electric core winding body is in a standard runway shape from inside to outside, namely the middle part is two parallel lines with equal length and cannot change along with the increase of the number of layers, the two ends are standard semicircles, but the perimeter of the semicircles can be periodically increased along with the increase of the radius period, and the change of the thickness of each layer is the thicknesscathodePlus a thickness T of the negative plateanodeAnd the thickness of the two isolation films is 2 × Tsep(ii) a Then, due to the periodic variation in thickness, the variation Δ = | (2 |) in the half circumference between adjacent layerssep+Tcathode+Tanode) For further explanation, the position determination of the negative pole tab is taken as a research object, the position equation of the positive pole tab can be derived according to the same idea, firstly, the following assumptions and definitions are given for the negative pole tab, A, the position of the head of the negative pole piece is defined as 0mm, namely a reference position, the position coordinates of the tab are subsequently determined, and specific numerical values are obtained by taking the reference position as the reference, B, the position of the first pole tab of the negative pole is defined as L1 in the winding body, and the distance from the position of the head of the pole piece is defined as L0I.e. L1=L0，L0Is flexible to change; C. because the inner layer is thin, the inner layer is regarded as a line segment; D. the actual winding is carried out by using a certain winding needle width WrollThe winding needle of the winding machine is used for winding,the different winding needles have thickness and inclination, so that there is a difference between the length of the line segment of the inner layer and the width of the actual winding needle, which is defined as TrollThen the length of the inner line segment is Wroll+Troll(ii) a E. Assuming that the positive pole lug is centrosymmetric and the lug width WtabSame, then the center distance of the pole lugs is DtabThe assumption is introduced for convenience of calculation, the eccentric structure is just considered to be a virtual assumption, and the same is true, wherein F is the position of the second tab of the negative pole, and the position of the second tab of the negative pole is L2，L2-L1= Wroll+Troll+Dtab= L, G, the position of the third tab of the negative pole is L3，L3-L2= Wroll+Troll- Dtab=S。
In the second step, the derivation process of the unified mathematical expression form of each layer of the tabs comprises the following steps of carrying out classification derivation on odd-numbered and even-numbered negative tabs due to the particularity of the positions of the adjacent tabs, wherein 1 is carried out, and L is carried outnN in (1) is an even number, then
Figure DEST_PATH_IMAGE014
2, if LnN in (1) is an odd number, then
Figure DEST_PATH_IMAGE016
The odd expression and the even expression in different forms are unified and written into an equation form, so that batch data processing and design table link establishment in subsequent engineering are facilitated, and finally the unified ideal equation of the tab position is as follows:
Figure DEST_PATH_IMAGE017
wherein the value of n is the number of the tab at the required position, for example, L when n =11=L0When n =2, L2=L0+L。
Introducing a correction factor in the third step, and performing numerical correction on the final mathematical expression by the following steps: the change is more obvious when the bare electric core is rolled out through the rolling needle and is closer to the outer layer; meanwhile, when the aluminum-plastic shell is actually filled, the naked electric core is actuallyWhen the shell is compacted, the length of the middle line segment and the semi-circle radius of each layer can be regularly changed, the length of the middle line segment is supposed not to be changed, the effect which is consistent with the actual situation is achieved by correcting the semi-circle length, the change rule is found by a calculus method, and a semi-circle length correction factor, namely the semi-circle length correction factor is introduced
Figure DEST_PATH_IMAGE019
Wherein n is the number of the tab at the required position,
Figure DEST_PATH_IMAGE021
is a correction factor; through correction, the actual tab position equation is as follows:
Figure 82788DEST_PATH_IMAGE022
the final equation is numerically modified based on the accumulation of actual data,
the numerical value modified physical equation of the final multi-tab position is as follows:
Figure DEST_PATH_IMAGE023
wherein
Figure DEST_PATH_IMAGE025
The coefficient for numerical value correction can be adjusted according to the actual process capability;
finally, the range of all the coefficients introduced, determined by the actual process capability, is specific when n <10, α is 0.6-0.7, β is 0.8-1.0, n >10, α is 0.6-0.7, β is 1.0-1.2.

Claims (1)

1. A method for preparing a lithium ion battery by adopting a multi-tab winding body battery cell comprises the following steps:
the method comprises the following steps of firstly, preparing positive and negative pole pieces, wherein the manufacturing method of the positive and negative pole pieces comprises the following steps: firstly, uniformly coating active slurry on a positive electrode aluminum or negative electrode copper current collector, and reserving an uncoated empty foil area in the vertical direction of the coating direction; then determining the position of each tab, and punching out the corresponding tab in a reserved empty foil area by using a cutting die to manufacture positive and negative pole pieces of the multi-tab;
winding around a winding needle with a set winding needle width to prepare a cell multi-tab winding body according to the placing sequence of an isolating film, a negative pole piece, the isolating film and the positive pole piece, and preparing a winding body cell with each layer of tabs overlapped with a positive pole tab and a negative pole tab, wherein the negative pole piece comprises each layer of tabs obtained by die-cutting and reserving blank copper foil through a cutting die after accurate positioning and electrode active substances coated on a copper foil, the negative pole piece before die-cutting is prepared by uniformly coating negative pole active slurry on a negative pole copper current collector, reserving an uncoated blank copper foil area with a proper width in the vertical direction of the coating direction, reserving a blank copper foil area with one side of the copper foil not coated with the electrode active substances, die-cutting and reserving the blank aluminum foil through the cutting die after accurate positioning to obtain each layer of tabs and the electrode active substances coated on the aluminum foil of the tabs, the manufacturing method of the positive pole piece before die cutting is that positive active slurry is evenly coated on a positive aluminum current collector, a blank aluminum foil area with proper width is reserved in the vertical direction of the coating direction, a plurality of tabs are formed in the blank aluminum foil area with one side not coated with electrode active substances through subsequent die cutting and serve as a positive pole current collector, the winding mode is that a first layer of the positive pole piece is placed at the position of a second layer of the negative pole piece in a negative pole wrapping mode, then winding is carried out around a winding needle, the negative pole coating area wraps the positive pole, the coating area length of the negative pole depends on the length of the coating area of the positive pole, the coating length of the positive pole is calculated in advance according to the designed capacity, pole piece surface density and compaction, and then the A surface and the B surface are shared according to the following calculation formula:
introduction ofnI.e. the length of the pole pieces of n layers, the algorithm is as follows: ln=Ln+1-Ln-1；
Length of anode coating A face
Figure 116833DEST_PATH_IMAGE001
;
Length of positive electrode coating B face
Figure 33973DEST_PATH_IMAGE002
;
Total length of positive electrode coating region
Figure 282552DEST_PATH_IMAGE003
，
The lengths of the two sides of the corresponding negative pole piece are equal and are all
Figure 677761DEST_PATH_IMAGE004
Wherein
Figure 85609DEST_PATH_IMAGE005
The excess of the anode and the cathode is called safety margin; wherein the total length of the anode aluminum foil is
Figure 908071DEST_PATH_IMAGE006
The method comprises the following steps of (1) enabling the heads of the positive pole piece and the negative pole piece to be free of blank foil areas, and reserving blank aluminum foil areas at the tail of the positive pole piece so as to use positive aluminum foil to carry out winding ending;
welding a positive electrode aluminum tab and a negative electrode copper tab of the prepared multi-tab winding body battery cell, and then respectively leading out a nickel tab and a copper nickel-plated tab; then, the lithium ion battery is filled into a punched aluminum-plastic film, top-side sealing, electrolyte injection, first sealing, standing, formation, second sealing and capacity grading are respectively carried out to prepare the lithium ion battery, and in order to utilize the space to the maximum extent, namely, in a certain space, as much energy as possible is filled.
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CN110380008A (en) * 2019-08-09 2019-10-25 江西星盈科技有限公司 Electrodes of lithium-ion batteries die-cutting process and die-cutting device
CN112510325A (en) * 2020-10-28 2021-03-16 天津空间电源科技有限公司 Cylindrical battery with die-cut tabs and manufacturing process thereof
CN112687844A (en) * 2020-12-24 2021-04-20 中国电子新能源（武汉）研究院有限责任公司 Battery production process
CN113851604A (en) * 2021-09-28 2021-12-28 惠州锂威新能源科技有限公司 Preparation method of multi-tab battery cell, multi-tab battery cell and multi-tab battery
CN114050324A (en) * 2021-10-19 2022-02-15 惠州锂威新能源科技有限公司 Multi-tab battery cell winding process, multi-tab battery cell, battery and electronic product
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