CN114927834B - Battery pole piece, electrode core and secondary battery - Google Patents
Battery pole piece, electrode core and secondary battery Download PDFInfo
- Publication number
- CN114927834B CN114927834B CN202210774813.0A CN202210774813A CN114927834B CN 114927834 B CN114927834 B CN 114927834B CN 202210774813 A CN202210774813 A CN 202210774813A CN 114927834 B CN114927834 B CN 114927834B
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- pole piece
- battery
- tab
- lug
- positive
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- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
-
- 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
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6553—Terminals or leads
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- 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
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)
Abstract
The invention discloses a battery pole piece, an electrode core and a secondary battery, wherein the battery pole piece comprises: the pole piece comprises a pole piece main body, a top pole lug and a side pole lug; the pole piece main body comprises a first end, a second end and a side surface which is connected with the first end and the second end along the length direction; when the battery pole piece is a negative pole piece, the top pole lug is arranged at the first end; when the battery pole piece is a positive pole piece, the top pole lug is arranged at the second end; the side is equipped with the 1 st side utmost point ear to the N side utmost point ear that base length increases gradually in proper order from first end to second end. The problem of current concentration at two ends of the battery core caused by current collection is avoided by calculating the distance between the side tabs and the number of the side tabs, so that the risk of thermal runaway of the pole piece is reduced, and the multiplying power and the safety performance of the battery are improved.
Description
Technical Field
The invention relates to the field of battery structural design, in particular to a battery pole piece, an electrode core and a secondary battery.
Background
CTP (Cell to Pack) technology is a focus of attention recently, and the weight of auxiliary materials of a battery can be effectively reduced by the mode, so that the electric quantity stored in the electric automobile can be greatly increased on one hand, and the endurance mileage of the electric automobile is further increased; on the other hand, the stability of the chassis structure of the electric automobile is improved. Meanwhile, in order to further reduce the weight of the battery cell package, improve the consistency of the battery cell and improve the accuracy of a management system, enterprises gradually transform to a large-size battery cell (such as 46800 cylindrical batteries published by Tesla and 'blade' batteries published by Biedi), the increase of the size of the battery cell can effectively reduce the weight of auxiliary materials (lugs, aluminum plastic films/aluminum shells and the like) and improve the management efficiency of the battery cell, but the increase of the size of the battery cell tends to cause the problems of uneven current distribution, overlarge current at the position of the lugs and the like, and the risk of potential leakage exists in battery package due to the lugs of large size, so the design of the lugs is crucial to the service life and capacity of the battery.
Disclosure of Invention
The invention aims to provide a battery pole piece, an electrode core and a secondary battery, which solve the problems of nonuniform current distribution and concentrated heat in a long battery core by arranging a plurality of side pole lugs on the battery pole piece. In order to solve the above-mentioned problems,
a first aspect of the present invention provides a battery pole piece comprising: the pole piece comprises a pole piece main body, a top pole lug and a side pole lug; the pole piece main body comprises a first end, a second end and a side surface which is connected with the first end and the second end along the length direction;
when the battery pole piece is a negative pole piece, the top tab is arranged at the first end;
when the battery pole piece is a positive pole piece, the top tab is arranged at the second end;
the side is provided with a 1 st side tab to an N th side tab with gradually increased bottom edge length from the first end to the second end in sequence.
Preferably, the bottom edge length of the side tab satisfies the following relationship:
L n /L n-1 ＝1.025+0.007/N (1)
wherein N is a positive integer greater than or equal to 3, N is a positive integer greater than or equal to 2 and less than or equal to N, L n Is the bottom edge length of the nth side tab.
Preferably, the spacing of the side tabs satisfies the following relationship:
d n+1 /d n ＝1.18+0.11/N (2)
d n the distance between the nth side tab and the (n-1) th side tab.
Preferably, the spacing of the side tabs satisfies the following relationship:
(d i +d 1 +d 2 +…+d N +d l )/L≥0.8 (3)
wherein d i Is the distance between the 1 st side lug and the first end, d l And L is the length of the pole piece main body and is the distance between the N side pole lug and the second end.
Preferably, the cross section of each side tab is in a right trapezoid or fan-shaped structure.
Preferably, each side tab is connected in series through a metal wire and led out from two ends of the battery pole piece in a sheet form; the cross section width dimensions of the metal wires are different; the metal wire is made of the same material as the side lug.
According to a second aspect of the present invention, there is provided an electrode core made of a stack of positive and negative electrode sheets made of the above-described battery electrode sheet.
Preferably, the positions of the positive side tabs on the respective positive electrode sheets in the stacking direction are the same; the positions of the negative side tabs on the negative plates along the stacking direction are the same;
the positive side tab and the negative side tab are arranged opposite to each other.
Preferably, the positive side tab is an aluminum material, and the negative side tab is a nickel-plated copper material.
According to a third aspect of the present invention, there is provided a secondary battery comprising the above-described electrode core.
The technical scheme of the invention has the following beneficial technical effects:
according to the invention, the side tabs are arranged at unequal intervals along the length direction of the battery core, so that the problem of current concentration at two ends of the battery core caused by current collection is avoided; through the length of each side tab base of design, effectively even battery internal current and heat distribution have reduced pole piece thermal runaway's risk, improve the multiplying power and the security performance of battery.
Drawings
FIG. 1 is a schematic illustration of a battery pole piece provided by the present invention;
FIG. 2 is a schematic view of a side tab position provided by the present invention;
fig. 3 is a schematic drawing of a lead-out mode of a side tab provided by the invention;
FIG. 4 is a schematic view of an electrode core provided by the present invention;
FIG. 5 is a comparative view of the electrode core model provided by the present invention;
FIG. 6 is a graph of the temperature profile for the center region corresponding to each model in FIG. 5.
Reference numerals:
1: a pole piece body; 2: side tabs; 21: a first side tab; 22: a second side tab; 23: a third side tab; 24: a fourth side tab; 25: a fifth side tab; 3: a top tab; 4: a metal wire; 5: tab tape; 6: a positive plate; 7: a negative plate.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Fig. 1 is a schematic structural view of a battery negative electrode sheet of the present invention, as shown in fig. 1, including a electrode sheet main body 1, a top tab 3, and a side tab 2; the pole piece body 1 includes: the first end, the second end and a side surface connecting the first end and the second end in the length direction. In the embodiment, the battery pole piece is a negative pole piece, and the top pole lug 3 is arranged at the second end; the bottom edge length of each side tab 2 provided on the side face gradually increases from the first end to the second end, and accordingly, the volume of each side tab gradually increases.
According to the invention, the plurality of side lugs are arranged, so that the current in the long electrode core is uniform, and the heat dissipation in the long electrode core is facilitated, so that the multiplying power and the safety performance of the electrode core are improved.
Further, the bottom edge length of the side tab satisfies the following relationship:
L n /L n-1 ＝1.025+0.007/N (1)
wherein N is a positive integer greater than or equal to 3, N is a positive integer greater than or equal to 2 and less than or equal to N, L n The bottom edge length of the nth side tab;
the spacing of the side tabs satisfies the following relationship:
d n+1 /d n ＝1.18+0.11/N (2)
d n the distance between the nth side tab and the (n-1) th side tab;
the spacing of the side tabs satisfies the following relationship:
(d i +d 1 +d 2 +…+d N +d l )/L≥0.8 (3)
wherein d i Distance d between the 1 st side tab and the first end l And L is the length of the pole piece main body and is the distance between the N side pole lug and the second end.
According to the invention, the length of the bottom edge of each side tab and the distance between the side tabs are set, so that the problem of local overhigh heat caused by nonuniform current in the long electrode core is solved, and the multiplying power and the safety performance of the electrode core are further improved.
FIG. 2 is a schematic diagram showing a positional relationship of five side tabs according to an embodiment of the present invention, wherein the bottom lengths of the first side tab 21 to the fifth side tab 25 are L in order 1 、L 2 、L 3 、L 4 And L 5 Distance from first end of pole piece main body 1 to first side pole earIs d 1 The distance from the first side lug to the second side lug is d 2 And so on, the distance from the fifth side lug to the second end of the pole piece main body 1 is d 6 Assuming that the length of the battery pole piece is L, it can be obtained by the formula (1) -formula (3):
the first side tab 21 is located between 9% -20% l,
the second side tab 22 is positioned between 20% -36% l,
the third side tab 23 is located between 36% -53% l,
the fourth side tab 24 is located between 53% -72% l,
the fifth side tab 25 is located between 72% -90% l,
preferably, it is recommended to be around the center of the above interval, i.e. 14.5% l, 28% l, 44.5% l, 62.5% l, 81% l.
From the heat generation equation of the tab:
q＝I 2 r/A·L′ (4)
wherein I represents a current;
r represents the internal resistance of the side tab;
a represents the cross-sectional area of the side tab;
l' represents the bottom edge length of the side tab;
as can be seen, the larger the contact area between the side tab and the battery pole piece is, the smaller the resistance is, and the less heat is generated, so as to be a preferred embodiment of the invention, the cross section of the side tab 2 is designed into a right trapezoid, which is more beneficial to the distribution and collection of the current in the long electrode core; alternatively, the cross section of the side tab 2 is designed in a fan shape.
Fig. 3 shows a lead-out mode of the side tabs, as shown in fig. 3, the metal wires 4 are respectively connected with each side tab by means of laser welding, the total current is decomposed by the metal wires 4, and the welded material is consistent with the material of the side tab. In order to ensure the tightness of the package, the metal wires 4 are led out in the form of thin sheets at two ends, and a tab adhesive tape 5 is attached at the sealing part connected with the top tab, so that the risk of leakage of the battery package is reduced.
Further, the cross section widths of the metal wires 4 are different, so that the resistance values of the metal wires are different and the overcurrent capacities are different. Therefore, the wider the cross section design of the metal wire which is closer to the lug position is, the higher the heat caused by the current can be effectively reduced.
A second embodiment of the present invention provides an electrode core, as shown in fig. 4, made by stacking a positive electrode sheet 6 and a negative electrode sheet 7, wherein the positive electrode sheet 6 and the negative electrode sheet 7 are made of the battery sheet in the first embodiment.
Specifically, the end tab on the positive plate 6 is opposite to the end tab on the negative plate 7; in the stacking direction, the positions of the side tabs of the positive electrodes are the same and overlap with each other; the positions of the lugs on the side surfaces of the cathodes are the same and are mutually overlapped. And the positions of each pair of positive side lug and negative side lug are opposite, the electrode core is divided into a plurality of small areas, and the time and the distance spent by the transmission of electrons and ions in each small area are basically consistent, so that the current in the electrode core is uniform, the problem of local current concentration of the electrode core is solved, a CTP mode can be realized, the heat dissipation of the electrode core is facilitated, the risk of thermal runaway of the positive and negative plates is reduced, and the charge and discharge multiplying power and the safety of the secondary battery are improved.
A third embodiment of the present invention provides a secondary battery fabricated using the electrode core including the above, and performing the following comparative test using the soft pack battery model of the different electrode core shown in fig. 5, as shown in fig. 5:
FIG. 5a is a basic cell model with only top tabs;
in the model of fig. 5b, the first side tab 21, the second side tab 22, the third side tab 23, the fourth side tab 24 and the fifth side tab 25 are arranged at equal intervals, and the cross-sectional areas of the respective side tabs are the same;
FIG. 5c is a view of the model of FIG. 5b, with the side tabs of the model being of unequal spacing, with the spacing increasing from left to right;
fig. 5d is a view of the model of fig. 5c, with the cross-sectional areas of the side tabs increasing in sequence from right to left.
The model is divided into A, B, C, D, E, F six small areas according to the first, second, third, fourth and fifth side tabs 21, 22, 23, 24 and 25.
As is known from the conventional study data, in the secondary battery with a long electrode core, as the discharge proceeds, the heat concentration of the battery at the center point increases and the heat concentration area concentrates, and the end of the discharge is that the area with high temperature is the side of the middle part of the battery near the tab at the top of the positive electrode, so that the center temperatures of the six small areas are sampled, and the center-area temperature graph shown in fig. 6 is obtained.
It can be seen that the number of the side tabs is increased on the tab side at the top of the positive electrode, and the current can be dispersed by reducing the distance between the side tabs, so that heat is dispersed, and the current distribution in the battery is uniform.
The invention aims to protect a battery pole piece, an electrode core and a secondary battery, and the side pole lugs are designed in the length direction of the battery core, so that the problem of current collection at two ends is avoided, and in addition, the design of a plurality of side pole lugs can well avoid the defect of uneven current distribution, thereby being beneficial to uniform current distribution and improving the multiplying power and the safety performance of the battery.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (7)
1. A battery pole piece, comprising: the pole piece comprises a pole piece main body, a top pole lug and a side pole lug; the pole piece main body comprises a first end, a second end and a side surface which is connected with the first end and the second end along the length direction;
when the battery pole piece is a negative pole piece, the top tab is arranged at the first end;
when the battery pole piece is a positive pole piece, the top tab is arranged at the second end;
the side face is sequentially provided with a 1 st side face electrode lug to a n th side face electrode lug, the bottom edge length of which is gradually increased, from the first end to the second end;
the bottom edge length of the side tab satisfies the following relation:
L n /L n-1 ＝1.025+0.007/N (1)
wherein N is a positive integer greater than or equal to 3, N is a positive integer greater than or equal to 2 and less than or equal to N, L n The bottom edge length of the nth side tab;
the spacing of the side tabs satisfies the following relation:
d n+1 /d n ＝1.18+0.11/N (2)
d n the distance between the nth side tab and the (n-1) th side tab;
the spacing of the side tabs satisfies the following relation:
(d i +d 2 +…+d n +d l )/L≥0.8 (3)
d i is the distance between the 1 st side lug and the first end, d l And L is the length of the pole piece main body and is the distance between the N side pole lug and the second end.
2. The battery pole piece of claim 1, wherein each of the side tabs has a right trapezoid or fan-shaped cross section.
3. The battery pole piece of claim 1, wherein each of the side tabs is connected in series by a metal wire and is led out in a sheet form at both ends of the battery pole piece; the cross section width dimensions of the metal wires are different; the metal wire is made of the same material as the side lug.
4. An electrode core comprising a stack of positive and negative electrode sheets made from the battery sheet of any one of claims 1-3.
5. The electrode core according to claim 4, wherein positions of positive side tabs on the respective positive electrode sheets in the stacking direction are the same; the positions of the negative side tabs on the negative plates along the stacking direction are the same;
the positive side tab and the negative side tab are arranged in opposition.
6. The electrode core of claim 5, wherein the positive side tab is an aluminum material and the negative side tab is a nickel-plated copper material.
7. A secondary battery comprising the electrode core according to any one of claims 4 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210774813.0A CN114927834B (en) | 2022-07-01 | 2022-07-01 | Battery pole piece, electrode core and secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210774813.0A CN114927834B (en) | 2022-07-01 | 2022-07-01 | Battery pole piece, electrode core and secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114927834A CN114927834A (en) | 2022-08-19 |
| CN114927834B true CN114927834B (en) | 2024-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210774813.0A Active CN114927834B (en) | 2022-07-01 | 2022-07-01 | Battery pole piece, electrode core and secondary battery |
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| Country | Link |
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| CN216719986U (en) * | 2021-08-31 | 2022-06-10 | 欣旺达电动汽车电池有限公司 | Battery pole piece, roll core and battery cell |
-
2022
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| JP2004319362A (en) * | 2003-04-18 | 2004-11-11 | Nissan Motor Co Ltd | Bipolar secondary battery |
| JP2005071784A (en) * | 2003-08-25 | 2005-03-17 | Nissan Motor Co Ltd | Bipolar battery having cooling tab |
| JP2005190685A (en) * | 2003-12-24 | 2005-07-14 | Shin Kobe Electric Mach Co Ltd | Lead acid storage battery |
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| WO2016187815A1 (en) * | 2015-05-26 | 2016-12-01 | 罗明镜 | Cylindrical high-rate lithium ion battery |
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| CN204793018U (en) * | 2015-08-24 | 2015-11-18 | 惠州市纬世新能源有限公司 | Cylinder lithium battery tab structural design |
| WO2017141613A1 (en) * | 2016-02-15 | 2017-08-24 | 日立オートモティブシステムズ株式会社 | Rectangular secondary battery |
| CN206471409U (en) * | 2017-01-10 | 2017-09-05 | 荆州市沃特玛电池有限公司 | A kind of negative plate |
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| CN114242944A (en) * | 2022-01-14 | 2022-03-25 | 惠州市赛能电池有限公司 | Negative plate component, battery core, preparation method of battery core and laminated battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114927834A (en) | 2022-08-19 |
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