CN101950816A - Square power lithium ion battery cell and manufacturing method thereof - Google Patents
Square power lithium ion battery cell and manufacturing method thereof Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000004804 winding Methods 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 238000003698 laser cutting Methods 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims description 12
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims description 8
- 239000013543 active substance Substances 0.000 claims description 6
- 239000011267 electrode slurry Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 210000004027 cell Anatomy 0.000 abstract 5
- 210000005056 cell body Anatomy 0.000 abstract 3
- 238000007599 discharging Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 210000005069 ears Anatomy 0.000 description 2
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
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Abstract
The invention discloses a square power lithium ion battery cell and a manufacturing method thereof, belonging to the field of lithium ion battery manufacturing. The square power lithium ion battery cell comprises a positive plate, a diaphragm, a negative plate, a positive lug and a negative lug; the square power lithium ion battery cell is formed by winding the positive plate, the diaphragm and the negative plate around a coiling needle; the upper side and the lower side of the coiling needle after coiled are both provided with the negative lug and the positive lug; the positive lug is positioned on one end of the battery cell body; the negative lug is positioned on the other end of the battery cell body; the positive lug and the negative lug are positioned on the same side of the battery cell body; and the negative lug and the positive lug are reserved by laser cutting. The method comprises: reserving a non-coated area for a pole piece coating coat; cutting the reserved lug by laser cutting according to the preset lug interval; and successively stacking and coiling the positive plate, the diaphragm and the negative plate into the battery cell. The square power lithium ion battery cell of the invention has tidy lug arrangement and can realize the large current discharging performance of the battery.
Description
Technical Field
The invention relates to a power lithium ion battery, in particular to a square power lithium ion battery cell and a manufacturing method thereof.
Background
In the modern society developing at a high speed, the traditional energy sources such as petroleum, coal, natural gas and the like are reduced along with the increasing exploitation of people, and clean and efficient energy conversion and storage systems such as lithium ion batteries, fuel cells and the like become effective methods for solving the environmental and energy problems faced by modern civilization. Among them, power lithium ion batteries have been widely used in the field of electric bicycles, electric and fuel motorcycles, electric and fuel automobiles, and other electric tools.
In the prior art, a power lithium ion battery cell usually adopts a multi-tab winding structure, and the cell adopting the multi-tab winding structure mainly has two tab manufacturing methods: one method is that a plurality of tabs are respectively welded on corresponding positions of a positive pole piece and a negative pole piece, an insulating adhesive tape is pasted on the tab positions, and then the pole pieces are wound to obtain a battery cell; the other method is to arrange an uncoated area on one side of the pole piece, and the uncoated area is arranged according to the tab spacing TA+1＝TAAnd (the difference of the winding circumferences of the upper layer and the lower layer) punching or cutting the pole pieces by a cutting die to form a plurality of pole lugs, and then winding the pole pieces to obtain the battery core.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems: when a high-capacity power battery cell is produced, if the tab is manufactured by the first method, after a pole piece is wound to form the cell, a plurality of tabs can only be distributed in a sector area, and positive and negative tabs are easily overlapped during production, so that inconvenience is brought to connection operation between the tabs and a polar terminal, and even the short circuit phenomenon is easily caused by the contact of the positive and negative tabs; if the second method is adopted to manufacture the pole lugs, the distance T between the pole lugs of the pole piece is determinedA+1＝TACutting or cutting a plurality of tabs by a cutting die (difference of winding circumferences of an upper layer and a lower layer), and winding the tabs into a battery cell, wherein at most one group of positive and negative tabs can be arranged in a winding period, so that the high-current discharge performance of the high-capacity power battery is influenced.
Disclosure of Invention
The purpose of the embodiments of the present invention is to provide a square power lithium ion battery cell, which can facilitate the connection between tabs and the connection between the tabs and the polar terminals, and avoid the short circuit phenomenon caused by the contact between the positive and negative tabs; the high-current discharge performance of the high-capacity power battery can be met.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
the utility model provides a square power lithium ion battery electricity core, includes positive plate, diaphragm, negative pole piece, positive tab and negative pole ear, positive tab with positive plate links to each other, the negative pole ear with the negative pole piece links to each other, square power lithium ion battery electricity core by positive plate, diaphragm, negative pole piece are formed around rolling up the needle coiling, and the upper and lower both sides of rolling up the needle after the coiling all have positive tab and negative pole ear, positive tab is located the one end of electric core body, the negative pole ear is located the other end of electric core body, positive tab with the negative pole ear is located same one side of electric core body.
The positive pole ear has three at least, and adjacent in proper order, and after positive plate expandes, the positive pole ear that is located the centre is with an adjacent positive pole ear's distance is 
The distance between the middle positive electrode tab and the other adjacent positive electrode tab is Ln × n × d/2+ t 4;
the cathode tabs are at least three and are adjacent in sequence, and after the cathode sheet is unfolded, the distance between the cathode tab in the middle and one adjacent cathode tab is equal to
d+w+t4-2T]The distance between the middle negative electrode tab and the other adjacent negative electrode tab is Ln ═ e × n × d/2+ t 4;
wherein e is the winding number of turns of the tab setting period, w is the total width of the upper and lower winding pins, n is the serial number of the tab spacing, d is the tolerance, and t4 is the total thickness of the upper and lower winding pins; the tolerance d is (T1+ T2+2T3) x pi/2, wherein T1 is the thickness of the positive plate, T2 is the thickness of the negative plate, T3 is the thickness of the diaphragm, T is the width of the positive/negative electrode tab, and x is a positive integer.
When the positive electrode sheet is unfolded, the distance between the middle positive electrode tab and one adjacent positive electrode tab is Ln × d + w + T4-2T, and the distance between the middle positive electrode tab and the other adjacent positive electrode tab is Ln × d/2+ T4; after the negative electrode sheets are unfolded, the distance between the middle negative electrode tab and one adjacent negative electrode tab is Ln-n × d + w + T4-2T, and the distance between the middle negative electrode tab and the other adjacent negative electrode tab is Ln-n × d/2+ T4.
The positive electrode lug and the negative electrode lug are reserved by laser cutting.
The invention provides another technical scheme that the manufacturing method of the square power lithium ion battery cell comprises the following specific steps:
(1) coating positive and negative electrode slurry containing lithium ion active substances on a copper aluminum foil, reserving a blank area on one side of the copper aluminum foil during coating, and preparing positive and negative electrode sheets;
(2) the distance between the lugs is set to make the distance between the middle lug and one adjacent lug among three successively adjacent lugsThe distance between the middle tab and the other adjacent tab is Ln × n × d/2+ t 4; and cutting the pole piece according to the set pole lug distance, and reserving the pole lug.
(3) Stack positive plate, diaphragm, negative pole piece, wind into electric core around rolling up the needle, make the positive ear of electric core is located the one end of electric core body, the negative pole ear of electric core is located the other end of electric core body, pastes and terminates the area.
The distance between the first tab and the adjacent tab is
The diaphragm is two-layer, and positive plate is located the top of upper diaphragm, the first anodal ear of positive plate leaves the distance with the left side edge of rolling up the needle on, when the distance enables upper diaphragm and positive plate to roll up to rolling up the needle down, the firstThe outer side of one positive tab is flush with the left side edge of the lower winding needle, the negative plate is positioned above the lower diaphragm, and the right side of the first negative tab of the negative plate is flush with the right side edge of the upper winding needle.
The positions of the positive plate and the negative plate on the diaphragm can be interchanged.
The width of the reserved blank area is equal to the thickness of a finished product battery cell.
The embodiment of the invention has the following beneficial effects: set up utmost point ear through adopting different intervals, not only make the positive ear of coiling back be located the one end of electric core, the negative pole ear is located the other end of electric core, makes things convenient for between utmost point ear and the operation of being connected of polarity terminal, enables moreover that electric core a coiling period can have two sets of positive and negative pole ears, therefore has good heavy current discharge performance.
Drawings
Fig. 1 is a schematic diagram of a cell structure of a square power lithium ion battery provided in an embodiment of the present invention, where e is equal to 1;
fig. 2 is a schematic diagram of a cell structure of a square power lithium ion battery provided in an embodiment of the present invention, where e is equal to 2;
fig. 3 is a schematic diagram of a cell structure of a square power lithium ion battery provided in an embodiment of the present invention, where e is equal to 4;
FIG. 4 is a schematic illustration of a pole piece coating provided in an embodiment of the present invention;
FIG. 5 is a schematic view of the distribution of multiple tabs in the electrode plate in example 2 of the present invention;
FIG. 6 is a schematic diagram of the distribution of multiple electrode tabs in embodiment 3 of the present invention;
FIG. 7 is a schematic diagram of the distribution of multiple tabs in the electrode plate in example 4 of the present invention;
fig. 8 illustrates a winding manner of a battery cell provided in an embodiment of the present invention;
fig. 9 is a schematic view of the connection of a tab and a post in an embodiment of the invention.
In the figure: 1 negative pole piece, 2 positive pole pieces, 3 diaphragms, 4 tabs, 5 uncoated areas, 6 positive pole or negative pole slurry, 7 pole pieces, 8 winding needles, 9 bolts, 10 shells and 11 pole columns.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, fig. 2 and fig. 3, a square power lithium ion battery cell comprises a positive plate, a diaphragm, a negative plate, a positive tab and a negative tab, wherein the positive tab is connected with the positive plate, the negative tab is connected with the negative plate, the square power lithium ion battery cell is formed by winding the positive plate, the diaphragm and the negative plate around a winding needle, the positive tab and the negative tab are arranged on the upper side and the lower side of the winding needle after winding, the positive tab is arranged at one end of an electric core body, the negative tab is arranged at the other end of the electric core body, and the positive tab and the negative tab are arranged on the same side of the electric core body.
In the power lithium ion battery cell in the embodiment of the invention, more than one positive electrode lug and more than one negative electrode lug can be arranged in each e (e is any positive integer) circle. The battery cell in the embodiment of the invention not only enables the battery to have good heavy-current discharge performance, but also can select the density of the lugs according to the actual production requirement. After winding, the positive electrode lug is orderly overlapped at one end of the electric core body, and the negative electrode lug is orderly overlapped at the other end of the electric core body, so that the connection operation between the electrode lugs and the polar terminal is facilitated, and the short circuit phenomenon caused by the contact of the positive electrode lug and the negative electrode lug is avoided.
After the positive plate is unfolded, the three sequentially adjacent positive lugs are positioned in the middle of the square power lithium ion battery cellThe distance between the positive lug and an adjacent positive lug is 
The distance between the middle positive electrode tab and the other adjacent positive electrode tab is Ln × n × d/2+ t 4; meanwhile, after the negative pole pieces are unfolded, the distance between the middle negative pole ear and one adjacent negative pole ear in the three sequentially adjacent negative pole ears is equal to
The distance between the middle negative electrode tab and the other adjacent negative electrode tab is Ln × n × d/2+ t 4. In the embodiment of the invention, the winding number of turns of the tab setting period is e, that is, the tab is set once every e turns of winding of the battery winding core, the set tab comprises two positive tabs and two negative tabs, the distance between the first positive tab of each tab setting period and the positive tab adjacent to the previous tab setting period is Ln ═ e × n × d/2+ t4, and the distance between the first positive tab and the adjacent positive tab in the same setting period is 
The distance between the first negative electrode tab of each tab setting period and the adjacent negative electrode tab of the previous tab setting period is Ln-e × n × d/2+ t4, and the distance between the first negative electrode tab and the adjacent negative electrode tab in the same setting period is
In the power lithium ion battery cell in the embodiment of the invention, each e-ring can be provided with two positive electrode lugs and two negative electrode lugs.
The tab 4 is reserved by laser cutting, hard contact with the pole piece is not needed during laser cutting, and burrs cannot be generated due to smooth edges of the pole piece after cutting.
In the prior art, a cutting die is usually adopted to punch or cut reserved lugs, the method must be in rigid contact with a pole piece, the pole piece is easy to separate from a preset position, when the length of a battery pole piece is long and the number of the battery lugs is large, the lugs of a battery core after winding are easy to align unevenly, and the contact of a positive pole and a negative pole can cause short circuit; and the edge part of the pole piece is easy to form burrs due to the hard contact between the cutting die and the pole piece, after the pole piece is wound into a battery cell, the burrs are easy to pierce the diaphragm to cause the mutual contact short circuit of the positive pole piece and the negative pole piece, and slight cracks are easy to form at the corner where the pole piece is connected with the pole lug, so that the battery has larger potential safety hazard in the using process. The pole lug in the embodiment of the invention is reserved by laser cutting, so that the defects in the prior art are avoided.
As shown in fig. 4, 8, and 9, the method for manufacturing a square power lithium ion battery cell in this embodiment includes the following specific steps:
(1) the method comprises the steps of continuously and uniformly coating positive electrode slurry containing lithium ion active substances on a copper aluminum foil to prepare a positive electrode sheet 2, continuously and uniformly coating negative electrode slurry containing the lithium ion active substances on the copper aluminum foil to prepare a negative electrode sheet 1, reserving an uncoated area 5 with the width of R on one side of the coatings of the positive and negative electrode sheets 2 and 1, and setting a positive electrode lug and a negative electrode lug, wherein the R is larger than or equal to the thickness of a finished product battery core.
If R is smaller than the thickness of the battery cell, the connection length of the outermost layer of the tab 4 and the pole 11 is not enough; if R is too long, more than one part is likely to contact the case 10 resulting in a short circuit of the battery, and therefore it is preferable that R be equal to the finished cell thickness.
(2) The distance between the electrode lugs with n being odd is calculated by a computer 
And respectively inputting the lug spacing e multiplied by n multiplied by d/2+ t4 with n being an even number into a PCI (Peripheral Component Interconnection) of a laser cutting machine, adjusting the production parameters of the setting equipment by the PCI, cutting the uncoated area 5 of the positive plate by the laser cutting machine according to the set production parameters to reserve the positive lug, and cutting the uncoated area 5 of the negative plate to reserve the negative lug.
The laser cutting machine is in the prior art, and specific operation steps are not described again.
The pole ear does not deviate from the preset position after cutting, and the edge is neat and has no burrs.
(3) One end of a diaphragm 3 penetrates through a space between an upper winding needle and a lower winding needle, then the diaphragm 3 is folded into two layers, the upper winding needle is located between the two layers of diaphragms, the right side edge of the upper winding needle is located at the folding position of the diaphragm 3, the positive plate 2 processed in the step (2) is placed above the upper layer diaphragm 3, a certain distance is reserved between the first positive lug of the positive plate 2 and the left side edge of the upper winding needle, the distance enables the upper layer diaphragm 3 and the positive plate 2 to be wound to the lower winding needle, the outer side of the first positive lug is aligned with the left side edge of the lower winding needle, the negative plate 1 processed in the step (2) is placed above the lower layer diaphragm 3, the right side of the first negative lug of the negative plate 1 is aligned with the right side edge of the upper winding needle, the negative plate is wound into an electric core anticlockwise after being placed, and the winding terminal is attached with a termination tape.
After winding, the positive electrode lugs are orderly overlapped at one end of the electric core body, and the negative electrode lugs are orderly overlapped at the other end of the electric core body. The negative electrode lug and the positive electrode lug are positioned on the same side of the electric core body, and the positive electrode lug and the negative electrode lug can be connected with a battery shell pole column through a bolt connection or riveting process.
Example 2
As shown in fig. 1 and 5, when the winding number e of the tab setting period is equal to 1, that is, the tab 4 is set once per winding of the battery cell, the tab 4 is set to include two positive tabs and two negative tabs. The battery cell is formed by coiling after positive plate, diaphragm, negative pole piece stack in proper order, and every coiling round, battery cell form two-layer positive plate and two-layer negative pole piece, and each layer of positive plate in rolling up the core all is equipped with a positive electrode tab, and each layer of negative pole piece in rolling up the core all is equipped with a negative electrode tab.
Taking the positive plate and the positive tab as examples: the positive pole ear of the first layer is positioned at the winding starting end, the positive pole ear of the second layer is close to the winding ending end of the first circle, the positive pole ear of the second layer and the positive pole ear of the first layer are positioned at the same pole ear arrangement period, namely the first pole ear arrangement period, the distance is L1, the positive pole ear of the third layer is positioned at the winding starting end of the second circle, namely the starting end of the second pole ear arrangement period, and the positive pole ear of the second layer are positioned at different pole ear arrangement periods, the distance is L2, wherein L1 is d + w + T4-2T, L2 is d + T4, and after the positive pole sheets are unfolded, the distance between the middle positive pole ear and one adjacent positive pole ear is n × d + w + T4-2T, the distance between the middle positive pole ear and the other adjacent positive pole ear is n × d + T4, and so on, the distance between the tabs with n being an odd number is n multiplied by d + w + T4-2T, and the distance between the tabs with n being an even number is n multiplied by d/2+ T4. The arrangement of the negative electrode plate and the negative electrode tab is the same as that of the positive electrode plate and the positive electrode tab.
Specifically, when the total width w of the upper and lower winding needles is 189mm, the total thickness t4 of the upper and lower winding needles is 8mm, the thickness of the positive plate is 0.16mm, the thickness of the negative plate is 0.1mm, the thickness of the diaphragm is 0.04mm, the length of the pole piece is 1013.5mm, the positive plate, the diaphragm and the negative plate of the battery cell are wound for 4.5 circles, and 9 positive lugs and 9 negative lugs are arranged.
In the embodiment of the invention, two positive electrode lugs and two negative electrode lugs are arranged in each circle of the battery core, so that the requirement of high-current discharge of a high-capacity power battery can be met.
As shown in fig. 1, fig. 5 and fig. 8, in the method for manufacturing a square power lithium ion battery cell in this embodiment,
the method comprises the following specific steps:
(1) the method comprises the steps of continuously and uniformly coating positive electrode slurry containing lithium ion active substances on a copper aluminum foil to prepare a positive electrode sheet 2, continuously and uniformly coating negative electrode slurry containing the lithium ion active substances on the copper aluminum foil to prepare a negative electrode sheet 1, reserving an uncoated area 5 with the width of R on one side of the coatings of the positive and negative electrode sheets 2 and 1, and setting a positive electrode lug and a negative electrode lug, wherein the R is larger than or equal to the thickness of a finished product battery core.
If R is smaller than the thickness of the battery cell, the connection length of the outermost layer of the tab 4 and the pole 11 is not enough; if R is too long, more than one part is likely to contact the case 10 resulting in a short circuit of the battery, and therefore it is preferable that R be equal to the finished cell thickness.
(2) The method comprises the steps of respectively inputting a tab spacing n multiplied by d + w + T4-2T with n being an odd number and a tab spacing n multiplied by d + T4 with n being an even number into a PCI (Peripheral Component Interconnection) of a laser cutting machine through a computer, adjusting production parameters of setting equipment through the PCI, cutting an uncoated area 5 of a positive plate by the laser cutting machine according to the set production parameters to reserve a positive tab, and cutting the uncoated area 5 of a negative plate to reserve a negative tab.
The laser cutting machine is in the prior art, and specific operation steps are not described again.
The pole ear does not deviate from the preset position after cutting, and the edge is neat and has no burrs.
(3) One end of a diaphragm 3 penetrates through a space between an upper winding needle and a lower winding needle, then the diaphragm 3 is folded into two layers, the upper winding needle is located between the two layers of diaphragms, the right side edge of the upper winding needle is located at the folding position of the diaphragm 3, the negative plate 1 processed in the step (2) is placed above the upper layer diaphragm 3, a certain distance is reserved between a first negative electrode tab of the negative plate 1 and the left side edge of the upper winding needle, the distance enables the upper layer diaphragm 3 and the negative plate 1 to be wound to the lower winding needle, the outer side of the first negative electrode tab is aligned with the left side edge of the lower winding needle, the positive plate 2 processed in the step (2) is placed above the lower layer diaphragm 3, the right side of the first positive electrode tab of the positive plate 2 is aligned with the right side edge of the upper winding needle, the battery cell is wound anticlockwise after the placement, and the winding terminal is attached with a termination tape.
Example 3
As shown in fig. 2 and 6, when the winding number e of the tab setting period is equal to 2, that is, the tab 4 is set once every two windings of the battery cell, and the set tabs 4 include two positive tabs and two negative tabs. The battery core is formed by sequentially stacking and winding a positive plate, a diaphragm and a negative plate.
Taking the positive plate and the positive tab as examples: the positive tab of first layer is located the coiling initiating terminal, and the positive tab of fourth layer is close to the terminal end that the second circle was coiled, and the positive tab of fourth layer and the positive tab of first layer are in same utmost point ear setting period, and its utmost point ear interval is L1, and the positive tab of fifth layer is located the initiating terminal that the third circle was coiled, and also be the initiating terminal of second utmost point ear setting period, and the positive tab with the fourth layer sets up the period at the utmost point ear of difference, and its utmost point ear interval is L2. Wherein,
the L2 is 2 xd + t4, and after the positive pole piece is unfolded, the distance between the middle positive pole ear and one adjacent positive pole ear in the pole piece is equal toThe distance between the middle positive tab and the other adjacent positive tab is Ln, n is multiplied by d + t4, and so on, the distance between the tabs with n being odd number is
And the tab spacing with n being an even number is n multiplied by d + t 4. The arrangement of the negative electrode plate and the negative electrode tab is the same as that of the positive electrode plate and the positive electrode tab.
The preparation method of the square power lithium ion battery cell in the embodiment is the same as that of the embodiment 2.
Example 4
As shown in fig. 3 and 7, when the winding number e of the tab setting period is equal to 4, that is, the tab 4 is set once every four windings of the battery cell, the tab 4 is set to include two positive tabs and two negative tabs. The battery cell is formed by sequentially stacking and winding a positive plate, a diaphragm and a negative plate.
Taking the positive plate and the positive tab as examples: the positive tab of the first layer is located at the winding starting end, the positive tab of the eighth layer is close to the winding ending end of the fourth circle, the positive tab of the eighth layer and the positive tab of the first layer are located at the same tab setting period, the tab distance is L1, the positive tab of the ninth layer is located at the winding starting end of the fifth circle, namely the starting end of the second tab setting period, and the positive tab of the ninth layer and the tab setting period are located at different tab setting periods, and the tab distance is L2. Wherein,
l2 is 4 xd + t4, and when the positive plate is unfolded, the distance between the middle positive tab and one adjacent positive tab is equal to
The distance between the middle positive tab and the other adjacent positive tab is Ln-2 n × d + t4, and so on, and the tab distance where n is an odd number isThe tab spacing with n being an even number is 2n × d + t 4. The arrangement of the negative electrode plate and the negative electrode tab is the same as that of the positive electrode plate and the positive electrode tab. The preparation method of the square power lithium ion battery cell in the embodiment is the same as that of the embodiment 2 or the embodiment 3.
Taking a power lithium ion battery for an automobile as an example, the performances of the batteries with different lug pitches are compared as follows:
table 1 comparison of battery performance between different tab spacings
| Maximum discharge rate | Maximum temperature of 1C discharge | Specific energy of mass | |
| Example 2 | 30C | 38℃ | 85Wh/kg |
| Example 3 | 12C | 40℃ | 89Wh/kg |
| Example 4 | 3C | 47℃ | 96Wh/kg |
As shown in table 1, the battery produced by using the battery cell in example 2 can discharge at a high rate, and the heat generated by large-current discharge is small, so that the battery is suitable for being used as a starting power supply of a hybrid electric vehicle;
the battery produced by the battery cell in the embodiment 3 has moderate discharge rate and mass ratio energy, and is suitable for being used as a power supply of an oil-electricity hybrid electric vehicle;
the battery produced by the battery cell in the embodiment 4 has high mass specific energy, and is suitable for a pure electric vehicle with low requirement on battery discharge rate, light vehicle body weight and small vehicle volume.
In summary, the square power lithium ion battery cell in the embodiment of the invention can be provided with the tabs according to different requirements of battery production, so that batteries with different requirements can be met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A square power lithium ion battery cell is characterized in that: including positive plate, diaphragm, negative pole piece, positive tab and negative pole ear, positive tab with positive plate links to each other, the negative pole ear with the negative pole piece links to each other, square power lithium ion battery electricity core by positive plate, diaphragm, negative pole piece are around rolling up the needle and convoluteing and form, and the upper and lower both sides of rolling up the needle after convoluteing all have positive tab and negative pole ear, positive tab is located the one end of electric core body, the negative pole ear is located the other end of electric core body, positive tab with the negative pole ear is located same one side of electric core body.
2. The square power lithium ion battery cell of claim 1, wherein:
the positive pole ear has three at least, and adjacent in proper order, and after positive plate expandes, the positive pole ear that is located the centre is with an adjacent positive pole ear's distance is
The distance between the middle positive electrode tab and the other adjacent positive electrode tab is Ln × n × d/2+ t 4;
the cathode tabs are at least three and are adjacent in sequence, and after the cathode sheet is unfolded, the distance between the cathode tab in the middle and one adjacent cathode tab is equal to 
The distance between the middle negative electrode lug and the other adjacent negative electrode lug is Ln × n × d/2+ t 4;
wherein e is the winding number of turns of the tab setting period, w is the total width of the upper and lower winding pins, n is the serial number of the tab spacing, d is the tolerance, and t4 is the total thickness of the upper and lower winding pins; the tolerance d is (T1+ T2+2T3) x pi/2, wherein T1 is the thickness of the positive plate, T2 is the thickness of the negative plate, T3 is the thickness of the diaphragm, T is the width of the positive/negative electrode tab, and x is a positive integer.
3. The square power lithium ion battery cell of claim 2, wherein: said e is equal to 1 and said e is equal to 1,
after the positive electrode sheet is unfolded, the distance between the middle positive electrode tab and one adjacent positive electrode tab is n × d + w + T4-2T, and the distance between the middle positive electrode tab and the other adjacent positive electrode tab is n × d/2+ T4;
after the negative electrode sheets are unfolded, the distance between the middle negative electrode tab and one adjacent negative electrode tab is Ln-n × d + w + T4-2T, and the distance between the middle negative electrode tab and the other adjacent negative electrode tab is Ln-n × d/2+ T4.
4. The square power lithium ion battery cell of claim 1, wherein: the positive electrode lug and the negative electrode lug are reserved by laser cutting.
5. A method of making a square power lithium ion battery cell of any of claims 1 to 3, characterized in that: the method comprises the following steps:
(1) coating positive and negative electrode slurry containing lithium ion active substances on a copper aluminum foil, reserving a blank area on one side of the copper aluminum foil during coating, and preparing positive and negative electrode sheets;
(2) the distance between the lugs is set to make the distance between the middle lug and one adjacent lug among three successively adjacent lugs
The distance between the middle tab and the other adjacent tab is Ln × n × d/2+ t 4; and cutting the pole piece according to the set pole lug distance, and reserving the pole lug.
(3) Stack positive plate, diaphragm, negative pole piece, wind into electric core around rolling up the needle, make the positive ear of electric core is located the one end of electric core body, the negative pole ear of electric core is located the other end of electric core body, pastes and terminates the area.
6. The method of making a square power lithium ion battery cell of claim 5, wherein: the distance between the first tab and the adjacent tab is
The diaphragm is two-layer, and positive plate is located the top of upper diaphragm, the first positive ear of positive plate leaves the distance with the left side edge of last book needle, the distance enables upper diaphragm and positive plate to convolute when rolling up the needle down, and the first positive ear outside is pasted neatly with the left side edge of rolling up the needle down, and the negative pole piece is located the top of lower floor's diaphragm, and the right side of the first negative ear of negative pole piece is pasted neatly with last book needle right side edge.
7. The method for manufacturing the square power lithium ion battery cell according to claim 6, wherein: the positions of the positive plate and the negative plate on the diaphragm can be interchanged.
8. The method for manufacturing the square power lithium ion battery cell according to claim 5, wherein: the width of the reserved blank area is equal to the thickness of a finished product battery cell.
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