CN116365183A - Multipolar lug structure design method for preventing lithium precipitation short circuit of negative plate and winding core - Google Patents
Multipolar lug structure design method for preventing lithium precipitation short circuit of negative plate and winding core Download PDFInfo
- Publication number
- CN116365183A CN116365183A CN202310210101.0A CN202310210101A CN116365183A CN 116365183 A CN116365183 A CN 116365183A CN 202310210101 A CN202310210101 A CN 202310210101A CN 116365183 A CN116365183 A CN 116365183A
- Authority
- CN
- China
- Prior art keywords
- negative electrode
- plate
- negative
- positions
- short circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 63
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001556 precipitation Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 title claims abstract description 17
- 238000000926 separation method Methods 0.000 claims description 7
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical group [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 claims description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 4
- 229910001416 lithium ion Inorganic materials 0.000 claims description 4
- 230000005405 multipole Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound 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
- H01M10/052—Li-accumulators
-
- 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
- H01M50/50—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
- H01M50/538—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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a multipolar lug structure design method for preventing lithium precipitation short circuit of a negative plate, which comprises the following steps: acquiring the position of each preset negative electrode lug in the negative electrode plate; the length of each circle of the positive plate and the negative plate during winding is calculated according to the diameter of the winding needle, the thickness of the diaphragm, the thickness of the positive plate and the thickness of the negative plate; calculating the corresponding number of turns and positions of each negative electrode lug in the winding core according to the positions of the negative electrode lugs; sequentially determining two N-zone positions corresponding to each negative electrode lug in the positive plate according to the number of turns and the positions; cutting out patches from the positive plate at the position of each N area; and an insulating gummed paper is stuck on each patch. According to the invention, the N area positions are determined on one side of the positive electrode sheet, which is close to the negative electrode lugs, and the patches are cut at each N area position, so that each negative electrode lug corresponds to two patches, both sides of the negative electrode lug are coated together, short circuit caused by that lithium is separated out to puncture the diaphragm is avoided, and the safety of the battery with the multi-electrode lug structure is improved.
Description
[ field of technology ]
The invention relates to the technical field of lithium batteries, in particular to a multi-lug structure design method for preventing a lithium-ion battery from being short-circuited by negative electrode piece separation and a winding core.
[ background Art ]
The lithium battery is widely applied to the fields of mobile phones, electric automobiles, military industry, 3C products and the like because of the advantages of high energy density, good safety, long cycle life and the like. With rapid development of technology, the market demand for lithium batteries is increasing, and the battery is required to support high-current charge and discharge and has good heat dissipation performance, so that a multi-lug structure battery capable of meeting the demand is provided. However, the bottleneck of the technology is limited by the safety problem caused by the lithium separation of the negative electrode lug, namely, the current density of the side of the negative electrode lug is higher than that of the electrode plate body, so that the lithium separation rate is faster, the lithium separation is easy to occur due to higher charging multiplying power, and the risk of short circuit caused by the fact that the negative electrode lug pierces the diaphragm is caused.
In view of the above, it is necessary to provide a multi-tab structure design method and winding core for preventing the short circuit of lithium precipitation of the negative electrode sheet to overcome the above-mentioned drawbacks.
[ invention ]
The invention aims to provide a multipolar lug structure design method and a winding core for preventing lithium precipitation short circuit of a negative electrode plate, and aims to solve the problem that the battery with the multipolar lug structure is easy to precipitate lithium and has a risk of piercing a diaphragm to cause short circuit, and improve the safety of the battery with the multipolar lug structure.
In order to achieve the above purpose, the present invention provides a multipolar ear structure design method for preventing a lithium-ion battery from being separated from a negative electrode sheet, comprising the following steps:
step 1: acquiring the position of each preset negative electrode lug in the negative electrode plate;
step 2: the length of each circle of the positive plate and the negative plate during winding is calculated according to the diameter of the winding needle, the thickness of the diaphragm, the thickness of the positive plate and the thickness of the negative plate;
step 3: calculating the corresponding number of turns and positions of each negative electrode lug in the winding core according to the positions of the negative electrode lugs;
step 4: sequentially determining two N-zone positions of each negative electrode lug corresponding to the positive electrode plate according to the number of turns and the positions; the N area is arranged on one side of the positive plate, which is close to the negative electrode lug, and each N area is used for cutting out a patch from the positive plate; the patches at the positions of the two N areas are respectively attached to two sides of the corresponding negative electrode lug;
step 5: and pasting insulating gummed paper on each patch.
In a preferred embodiment, the number of the negative electrode lugs is four, and the negative electrode lugs are arranged at intervals and distributed on the same side of the negative electrode plate; the number of the N area positions is eight, and the corresponding patches are distributed on the same side of the positive plate.
In a preferred embodiment, in step 2:
defining the diameter of the winding needle as a, the thickness of the diaphragm as b, the thickness of the positive plate as c and the thickness of the negative plate as d, and pre-winding the diaphragm for 2 circles and pre-winding the negative plate for 1.2 circles when winding, wherein the steps are as follows:
R 1 ＝a+4*b+1.2*d，Rn＝R 1 +(n-1)(2*b+d+c)；
C 1 ＝2πR 1 ，Cn＝2πRn；
R` 1 ＝a+4*b，R`n＝R` 1 +(n-1)(2*b+d+c)；
C` 1 ＝2πR 1 ，C`n＝2πRn；
wherein R is 1 Radius of the positive plate of the first circle, C 1 The length of the first circle of positive plate is n, the number of corresponding circles is n, rn is the radius of the nth circle of positive plate, and Cn is the length of the nth circle of positive plate; r 1 The radius of the first circle of negative plate; c 1 The length of the first circle of negative plate; n is the corresponding number of turns, R 'n is the radius of the n-th turn of the negative plate, and C' n is the length of the n-th turn of the negative plate.
In a preferred embodiment, in step 3:
Sn＝C 1 +C 2 +....Cn＝2π(R 1 +R 2 +....Rn)＝n*2π[a+(n+1)b+(n+1)c+(n+1)d]；
S`n＝C` 1 +C` 2 +....C`n＝2π(R` 1 +R` 2 +...R`n)＝n*2π[a+(n+1)b+(n-1)c+(n+1)d]；
wherein Sn is the sum of the circumferences of the positive plates, and S' n is the sum of the circumferences of the negative plates.
In a preferred embodiment, in step 4, it comprises:
calculating the number of turns in the winding core and the offset distance relative to the preset winding core central line according to the position of each negative electrode lug in the negative electrode plate along the length direction;
determining two adjacent turns of the negative electrode lug in the positive electrode plate according to the turns, and adding the offset distance to the two adjacent turns to obtain positions of two corresponding N-region positions in a winding core;
and calculating the position of each N area position in the length direction of the positive plate according to the positions of the two N area positions in the winding core.
In a preferred embodiment, the patch has a width greater than the width of the negative ear.
In a preferred embodiment, the patch is 1mm-2mm wider than the negative ear.
In a preferred embodiment, the insulating offset is PI offset.
The invention also provides a multipolar lug winding core for preventing the lithium precipitation short circuit of the negative electrode plate, which is prepared by the multipolar lug structural design method for preventing the lithium precipitation short circuit of the negative electrode plate.
According to the multi-pole ear structure design method for preventing the lithium precipitation short circuit of the negative pole piece and the winding core, the N area positions are determined on one side, close to the negative pole ear, of the positive pole piece, and the patches are cut at each N area position, so that each negative pole ear corresponds to two patches, and further when the positive pole piece, the winding needle, the diaphragm and the negative pole piece are wound into the winding core, the two patches attached with the insulating adhesive paper are just positioned on two sides of the corresponding negative pole ear, so that the two sides of the negative pole ear are coated together, lithium precipitation on the two sides of the negative pole ear is coated and isolated, short circuit caused by the fact that the lithium precipitation pierces the diaphragm is avoided, and safety of the multi-pole ear structure battery is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a multi-lug structure design method for preventing lithium precipitation short circuit of a negative electrode plate;
FIG. 2 is a schematic illustration of the position of the positive and negative tabs on the corresponding pole pieces;
fig. 3 is a schematic top view of a winding core.
[ detailed description ] of the invention
In order to make the objects, technical solutions and advantageous technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the invention, and not to limit the invention.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In the embodiment of the invention, a multi-pole lug structure design method for preventing a lithium-out short circuit of a negative pole piece is provided, and the multi-pole lug structure design method is used for determining a plurality of N area positions of a positive pole piece, which are close to one side of the negative pole lug, according to the position of the negative pole lug on the negative pole piece, so that patches on every two N area positions are just covered on two sides of the negative pole lug in a winding core, and the lithium-out of the negative pole lug is prevented from puncturing a winding core diaphragm.
As shown in FIG. 1, the design method of the multi-lug structure for preventing the lithium precipitation short circuit of the negative electrode plate comprises the following steps 1-5.
Step 1: and acquiring the position of each preset negative electrode lug on the negative electrode plate.
The position of each negative electrode lug on the negative electrode plate can be set according to specific technological requirements. In this embodiment, the plurality of negative electrode tabs are equally spaced on the same side of the negative electrode sheet.
Step 2: and respectively calculating the length of each circle of the positive plate and the negative plate during winding according to the diameter of the winding needle, the thickness of the diaphragm and the thickness of the positive plate and the thickness of the negative plate.
It can be understood that the winding core is formed by winding the positive electrode sheet, the diaphragm and the negative electrode sheet which are attached and stacked together on the winding needle. The diaphragm is positioned between the positive plate and the negative plate to play a role in insulation and isolation, and the winding needle plays a role in supporting the inside of the winding core. The winding needle is typically a thin cylindrical tube.
Specifically, the diameter of the winding needle can be defined as a, the thickness of the diaphragm is b, the thickness of the positive plate is c, the thickness of the negative plate is d, the diaphragm is pre-wound for 2 circles during winding, and the negative plate is pre-wound for 1.2 circles, then:
R 1 ＝a+4*b+1.2*d，Rn＝R 1 +(n-1)(2*b+d+c)；
C 1 ＝2πR 1 ，Cn＝2πRn；
R` 1 ＝a+4*b，R`n＝R` 1 +(n-1)(2*b+d+c)；
C` 1 ＝2πR 1 ，C`n＝2πRn；
wherein R is 1 Radius of the positive plate of the first circle, C 1 The length of the first circle of positive plate is n is the corresponding circle number, rn is the radius of the nth circle of positive plate, cnThe length of the positive plate of the nth turn; r 1 The radius of the first circle of negative plate; c 1 The length of the first circle of negative plate; n is the corresponding number of turns, R 'n is the radius of the n-th turn of the negative plate, and C' n is the length of the n-th turn of the negative plate.
Step 3: and calculating the corresponding number of turns and positions of each negative electrode lug in the winding core according to the positions of the negative electrode lugs.
Specifically, sn=c 1 +C 2 +....Cn＝2π(R 1 +R 2 +....Rn)＝n*2π[a+(n+1)b+(n+1)c+(n+1)d]；
S`n＝C` 1 +C` 2 +....C`n＝2π(R` 1 +R` 2 +...R`n)＝n*2π[a+(n+1)b+(n-1)c+(n+1)d]；
Wherein Sn is the sum of the circumferences of the positive plates, and S' n is the sum of the circumferences of the negative plates.
It should be noted that, although the positive electrode sheet and the negative electrode sheet are spirally wound, the radius of each part is continuously changed, but the difference of the radius of the positive electrode sheet and the radius of the negative electrode sheet in the same circle is very small, in order to facilitate data processing, in the above equation, each circle is subjected to equal radius processing.
Step 4: sequentially determining two N-zone positions corresponding to each negative electrode lug in the positive plate according to the number of turns and the positions; the N area is arranged on one side of the positive plate, which is close to the negative electrode lug, and each N area is cut out of the positive plate to form a patch; the patches at the two N areas are respectively attached to two sides of the corresponding negative electrode lug.
It should be noted that, as shown in fig. 2, the N-region is located on the side of the positive electrode plate near the negative electrode tab, and may be cut during preparation of the positive electrode plate, or the patch may be welded on the N-region. When the winding core is wound, the two N positions are just positioned at two sides of the corresponding negative electrode lug. For example, the first negative electrode tab is located at the 10 th turn of the negative electrode sheet, and since the positive electrode sheet and the negative electrode sheet are attached, the turns of the positive electrode sheet and the negative electrode sheet are staggered, and then the turns of the positive electrode sheet adjacent to the first negative electrode tab are located between the 9 th turn and the 10 th turn or between the 10 th turn and the 11 th turn of the positive electrode sheet. However, in this embodiment, the negative electrode tab is pre-rolled by 1.2 turns, so that the number of turns of the positive electrode tab adjacent to the first negative electrode tab is between the 9 th turn and the 10 th turn of the positive electrode tab, and at this time, the two adjacent positions of the first negative electrode tab at the 9 th turn and the 10 th turn of the positive electrode tab are the corresponding N-zone positions.
Further, in this embodiment, the number of the negative electrode tabs is four, and the negative electrode tabs are arranged at intervals and distributed on the same side of the negative electrode tab; the number of N area positions is eight, and the corresponding patches are distributed on the same side of the positive plate.
As shown in fig. 2, N1N2, N3N4, N5N6, N7N8 are positions of the first to fourth negative electrode tabs in the negative electrode tab, respectively, N1 and N2 correspond to the first negative electrode tab N1N2, N3 and N4 correspond to the second negative electrode tab N3N4, N5 and N6 correspond to the third negative electrode tab N5N6, and N7 and N8 correspond to the fourth negative electrode tab N7N 8. N1 to N8 are N area positions of the positive plate.
Specifically, step 4 includes steps 41 to 43.
And step 41, calculating the number of turns in the winding core and the offset distance relative to the preset winding core center line according to the position of each negative electrode lug in the negative electrode plate along the length direction.
And 42, determining two adjacent turns of the negative electrode lug in the positive electrode plate according to the turns, and adding the offset distance to the two adjacent turns to obtain the positions of the corresponding two N areas in the winding core.
And 43, calculating the position of each N region position in the length direction of the positive plate according to the positions of the two N region positions in the winding core.
For example, the diameter a of the winding needle is 5mm, the thickness b of the diaphragm is 0.012mm, the winding thickness c of the positive plate is 0.143mm, the winding thickness d of the negative plate is 0.107mm, the spacing between the positive lugs is 900.5mm, the spacing between the negative lugs is 922.5mm, the fixed length of the positive lugs is 305mm, and the fixed length of the negative lugs is 510mm, wherein the cutting fixed length of the first lug of the positive and negative plates can be specifically set according to the technological requirements.
As shown in fig. 3, the formula S' n=n×2pi [ a+ (n+1) b+ (n-1) c+ (n+1) d]The first negative electrode lug of the negative electrode plate can be calculated to be 6.6mm to the left at the center line of the 17 th turn, then the corresponding N1 region is 6.6mm to the left at the center line of the 16 th turn of the positive electrode plate, and the formula Sn=n is adopted for the following formula2π[a+(n+1)b+(n+1)c+(n+1)d]Can calculate the length of the N1 region at the position S 16 +6.6mm= 481.6mm; the corresponding N2 region is 6.6mm to the left on the 17 th turn center line of the positive plate, and is represented by the formula Sn=n.2pi [ a+ (n+1) b+ (n+1) c+ (n+1) d]Can calculate the length of the N2 region at the position S 17 +6.6mm=524.2 mm. The N area positions of the positive electrode corresponding to the second, third and fourth negative electrode lugs of the negative electrode sheet can be calculated in the same way, the coating process is designed after the N area positions are determined, and then winding is performed.
Therefore, the position of the tab can be accurately positioned through a simple calculation formula, the tab can be freely adjusted according to the process requirement, a great amount of waste of experimental manpower and material resources is avoided, the tab is applicable to all cylindrical winding batteries, the short circuit risk caused by poor adhesive sticking of the negative tab can be reduced, and the amount of positive electrode dressing can be reduced.
Step 5: and an insulating gummed paper is stuck on each patch. In this embodiment, the insulating offset paper is PI (polyimide) offset paper. Wherein, the patch is left white, and then the insulating gummed paper is stuck.
Further, the width of paster is greater than the width of negative pole ear, and highly is also greater than the height of negative pole ear to two paster can be together with the both sides complete cladding of corresponding negative pole ear, thereby form the isolation layer, thereby avoid the separation lithium of negative pole ear to puncture the diaphragm and thereby cause the battery short circuit risk. Wherein the patch is 1mm-2mm wider than the width of the negative electrode lug.
The invention also provides a multipolar lug winding core for preventing the lithium precipitation short circuit of the negative electrode plate, which is prepared by the multipolar lug structural design method for preventing the lithium precipitation short circuit of the negative electrode plate.
In summary, according to the multipolar lug structure design method and winding core for preventing the lithium precipitation short circuit of the negative electrode plate, the N area positions are determined on one side, close to the negative electrode lug, of the positive electrode plate, and patches are cut at each N area position, so that each negative electrode lug corresponds to two patches, and further when the positive electrode plate, the winding needle, the diaphragm and the negative electrode plate are wound into the winding core, the two patches attached with insulating adhesive paper are just positioned on two sides of the corresponding negative electrode lug, so that the two sides of the negative electrode lug are coated together, lithium precipitation on the two sides of the negative electrode lug is coated and isolated, short circuit caused by the fact that the lithium precipitation pierces the diaphragm is avoided, and safety of the multipolar lug structure battery is improved.
The present invention is not limited to the details and embodiments described herein, and thus additional advantages and modifications may readily be made by those skilled in the art, without departing from the spirit and scope of the general concepts defined in the claims and the equivalents thereof, and the invention is not limited to the specific details, representative apparatus and illustrative examples shown and described herein.
Claims (9)
1. The design method of the multi-lug structure for preventing the lithium precipitation short circuit of the negative electrode plate is characterized by comprising the following steps of:
step 1: acquiring the position of each preset negative electrode lug in the negative electrode plate;
step 2: the length of each circle of the positive plate and the negative plate during winding is calculated according to the diameter of the winding needle, the thickness of the diaphragm, the thickness of the positive plate and the thickness of the negative plate;
step 3: calculating the corresponding number of turns and positions of each negative electrode lug in the winding core according to the positions of the negative electrode lugs;
step 4: sequentially determining two N-zone positions of each negative electrode lug corresponding to the positive electrode plate according to the number of turns and the positions; the N area is arranged on one side of the positive plate, which is close to the negative electrode lug, and each N area is used for cutting out a patch from the positive plate; the patches at the positions of the two N areas are respectively attached to two sides of the corresponding negative electrode lug;
step 5: and pasting insulating gummed paper on each patch.
2. The method for designing a multi-tab structure for preventing lithium precipitation short circuit of a negative electrode tab according to claim 1, wherein the number of the negative electrode tabs is four, and the negative electrode tabs are arranged at intervals and distributed on the same side of the negative electrode tab; the number of the N area positions is eight, and the corresponding patches are distributed on the same side of the positive plate.
3. The method for designing a multipolar ear structure for preventing lithium precipitation short circuit of a negative electrode sheet according to claim 1, wherein in step 2:
defining the diameter of the winding needle as a, the thickness of the diaphragm as b, the thickness of the positive plate as c and the thickness of the negative plate as d, and pre-winding the diaphragm for 2 circles and pre-winding the negative plate for 1.2 circles when winding, wherein the steps are as follows:
R 1 ＝a+4*b+1.2*d，Rn＝R 1 +(n-1)(2*b+d+c)；
C 1 ＝2πR 1 ，Cn＝2πRn；
R` 1 ＝a+4*b，R`n＝R` 1 +(n-1)(2*b+d+c)；
C` 1 ＝2πR 1 ，C`n＝2πRn；
wherein R is 1 Radius of the positive plate of the first circle, C 1 The length of the first circle of positive plate is n, the number of corresponding circles is n, rn is the radius of the nth circle of positive plate, and Cn is the length of the nth circle of positive plate; r 1 The radius of the first circle of negative plate; c 1 The length of the first circle of negative plate; n is the corresponding number of turns, R 'n is the radius of the n-th turn of the negative plate, and C' n is the length of the n-th turn of the negative plate.
4. The method for designing a multi-tab structure for preventing a lithium-ion battery from being shorted by negative electrode tab as set forth in claim 3, wherein in step 3:
Sn＝C 1 +C 2 +....Cn＝2π(R 1 +R 2 +....Rn)＝n*2π[a+(n+1)b+(n+1)c+(n+1)d]；
S`n＝C` 1 +C` 2 +....C`n＝2π(R` 1 +R` 2 +...R`n)＝n*2π[a+(n+1)b+(n-1)c+(n+1)d]；
wherein Sn is the sum of the circumferences of the positive plates, and S' n is the sum of the circumferences of the negative plates.
5. The method for designing a multi-tab structure for preventing a short circuit of lithium ion battery separator according to claim 4, wherein in step 4, the method comprises:
calculating the number of turns in the winding core and the offset distance relative to the preset winding core central line according to the position of each negative electrode lug in the negative electrode plate along the length direction;
determining two adjacent turns of the negative electrode lug in the positive electrode plate according to the turns, and adding the offset distance to the two adjacent turns to obtain positions of two corresponding N-region positions in a winding core;
and calculating the position of each N area position in the length direction of the positive plate according to the positions of the two N area positions in the winding core.
6. The method for designing a multi-tab structure for preventing a short circuit of lithium separation of a negative electrode tab according to claim 1, wherein the patch has a width larger than that of the negative electrode tab.
7. The method for designing a multi-tab structure for preventing a short circuit in lithium separation of a negative electrode tab according to claim 6, wherein the patch is 1mm to 2mm wider than the negative electrode tab.
8. The method for designing a multipolar ear structure for preventing lithium precipitation short circuit of a negative electrode sheet according to claim 1, wherein the insulating gummed paper is PI gummed paper.
9. The multipolar ear winding core for preventing the lithium precipitation short circuit of the negative electrode sheet is characterized by being prepared by the multipolar ear structural design method for preventing the lithium precipitation short circuit of the negative electrode sheet according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310210101.0A CN116365183A (en) | 2023-03-07 | 2023-03-07 | Multipolar lug structure design method for preventing lithium precipitation short circuit of negative plate and winding core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310210101.0A CN116365183A (en) | 2023-03-07 | 2023-03-07 | Multipolar lug structure design method for preventing lithium precipitation short circuit of negative plate and winding core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116365183A true CN116365183A (en) | 2023-06-30 |
Family
ID=86906070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310210101.0A Pending CN116365183A (en) | 2023-03-07 | 2023-03-07 | Multipolar lug structure design method for preventing lithium precipitation short circuit of negative plate and winding core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116365183A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117577961A (en) * | 2024-01-16 | 2024-02-20 | 广州融捷能源科技有限公司 | Rolling core structure, tab dislocation adjusting method thereof and battery |
-
2023
- 2023-03-07 CN CN202310210101.0A patent/CN116365183A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117577961A (en) * | 2024-01-16 | 2024-02-20 | 广州融捷能源科技有限公司 | Rolling core structure, tab dislocation adjusting method thereof and battery |
| CN117577961B (en) * | 2024-01-16 | 2024-03-29 | 广州融捷能源科技有限公司 | Rolling core structure, tab dislocation adjusting method thereof and battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111668451B (en) | Preparation method of pole piece for winding type multi-pole lug battery cell, pole piece and battery cell | |
| CN107834014B (en) | High-power cylindrical lithium ion battery cell | |
| EP2299522B1 (en) | Method of manufacturing electrode assembly for rechargeable battery | |
| CN101640286B (en) | Core of spirally wound lithium battery and spirally wound lithium battery | |
| CN101604763B (en) | Narrow type lithium-ion battery and manufacturing process thereof | |
| KR101767636B1 (en) | Press roll for electode sheet | |
| CN110783638B (en) | Winding stacked battery cell and preparation method thereof | |
| CN113299920B (en) | Lithium battery roll core | |
| CN212392291U (en) | Battery cell structure and lithium battery | |
| CN116365183A (en) | Multipolar lug structure design method for preventing lithium precipitation short circuit of negative plate and winding core | |
| CN107293806B (en) | Winding type battery cell | |
| CN102208679B (en) | Wound continuous laminated square lithium ion power battery | |
| CN104009259B (en) | The coiler device with assembling core barrel for secondary cell | |
| CN117577961B (en) | Rolling core structure, tab dislocation adjusting method thereof and battery | |
| CN114335754A (en) | Battery with a battery cell | |
| JP2010205429A (en) | Nonaqueous electrolyte secondary battery and electrode for the same | |
| CN116404269A (en) | Battery cell, battery and electric equipment | |
| CN107293804B (en) | Winding type battery cell | |
| CN112670596B (en) | Battery cell, battery cell winding method and battery | |
| CN109952680B (en) | Lithium secondary battery including cylindrical jelly roll | |
| CN202454677U (en) | High-multiplying-factor discharge power lithium battery core and lithium battery | |
| CN107732285B (en) | Combined type electric core | |
| CN105375060A (en) | High-rate polymer lithium ion battery and preparation method therefor | |
| CN220358160U (en) | Reel core structure, battery and battery power utilization device | |
| CN205194794U (en) | High magnification polymer lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |