CN220021305U - Battery cell and battery - Google Patents
Battery cell and battery Download PDFInfo
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- CN220021305U CN220021305U CN202320297824.4U CN202320297824U CN220021305U CN 220021305 U CN220021305 U CN 220021305U CN 202320297824 U CN202320297824 U CN 202320297824U CN 220021305 U CN220021305 U CN 220021305U
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- battery
- positive electrode
- active material
- cell
- electrode active
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- 239000011888 foil Substances 0.000 claims abstract description 41
- 239000007774 positive electrode material Substances 0.000 claims abstract description 28
- 230000017525 heat dissipation Effects 0.000 claims abstract description 10
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 9
- 239000007773 negative electrode material Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims 3
- 238000000034 method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 17
- 229910052744 lithium Inorganic materials 0.000 abstract description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 12
- 230000014759 maintenance of location Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- -1 polytetrafluoroethylene Polymers 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002033 PVDF binder Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 2
- 239000011883 electrode binding agent Substances 0.000 description 2
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011255 nonaqueous electrolyte Substances 0.000 description 2
- 150000002895 organic esters Chemical class 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 150000008053 sultones Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- 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
Abstract
The embodiment of the utility model provides a battery cell and a battery, and belongs to the field of lithium batteries. The battery cell includes: the positive plate and the negative plate, be equipped with empty foil district in the middle of the positive plate's the positive active material for the heat dissipation, wherein, empty foil district does not contain the positive active material, in the charge-discharge process, empty foil district does not produce heat to the battery that utilizes this positive plate and negative plate to assemble can reduce the battery and face temperature, and then reduces the high temperature condition in the battery use, reduces the gas production, promotes battery capacity retention and battery's volume energy efficiency.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a battery cell and a battery.
Background
The lithium ion secondary battery (lithium battery for short) has the characteristics of small volume, light weight, high working voltage, high energy, long cycle life, small pollution and the like, is an ideal energy source for future development, and is applied to more and more fields. However, the lithium battery has serious heating in the use process, especially the middle heating of the battery is more serious, and when the heat dissipation effect of the shell of the lithium battery is not ideal, the internal air pressure of the lithium battery is easily increased, so that the lithium battery is bulged and damaged; aiming at the problems exposed in the current use process of the lithium battery, the lithium battery needs to be structurally improved and optimized.
In the prior art, the heat dissipation rate is improved by increasing the external heat dissipation structure, or the temperature is reduced by the outer package, but the volume of the battery is increased by the external heat dissipation structure and the outer package, so that the volumetric energy efficiency of the battery is obviously reduced.
Disclosure of Invention
The embodiment of the utility model aims to provide a battery cell and a battery, which are used for solving the technical problems in the prior art.
In order to achieve the above object, an embodiment of the present utility model provides a battery cell, including a positive electrode sheet and a negative electrode sheet, wherein an empty foil area is provided in the middle of a positive electrode active material of the positive electrode sheet for heat dissipation, wherein the empty foil area does not contain the positive electrode active material, and the empty foil area does not generate heat during charging and discharging processes.
Optionally, the empty foil region is disposed in a middle section, a middle front section or a middle rear section of the region where the positive electrode active material is located.
Optionally, the area occupied by the empty foil area is 10% -25% of the area occupied by the positive electrode active material.
Optionally, the empty foil area is rectangular or bent strip-shaped.
Optionally, the width of the empty foil area is 1-10mm.
Optionally, the width of the empty foil area is 3-5mm.
Optionally, the positive electrode active material is lithium iron phosphate.
Optionally, the end of the positive plate forms a positive tab.
Optionally, the positive electrode lug is connected with a positive electrode post of the battery cell.
Optionally, the end of the negative plate forms a negative electrode lug.
Optionally, the negative electrode lug is connected with a negative electrode post of the electric core.
Optionally, the negative electrode active material of the negative electrode plate is graphite.
In another aspect, the present utility model provides a battery comprising the above-described cell.
Through the technical scheme, when the positive plate is coated, the empty foil area is arranged in the middle of the positive electrode active material and used for radiating heat, the empty foil area does not contain the positive electrode active material, and heat is not generated in the empty foil area in the charge and discharge process, so that the large-surface temperature of the battery can be reduced by utilizing the battery assembled by the positive plate and the negative plate, the high-temperature condition in the use process of the battery is further reduced, the gas production is reduced, and the capacity retention rate of the battery and the volume energy efficiency of the battery are improved.
Additional features and advantages of embodiments of the utility model will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain, without limitation, the embodiments of the utility model. In the drawings:
fig. 1 is a schematic structural view of a positive plate provided in the prior art;
fig. 2 is a schematic structural diagram of a positive plate according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a negative plate according to an embodiment of the present utility model.
Description of the reference numerals
10 positive electrode tab 11 positive electrode active material
12 empty foil region 13 negative electrode ear
14 negative electrode active material
Detailed Description
The following describes the detailed implementation of the embodiments of the present utility model with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.
Referring to fig. 1, a schematic structure of a positive plate provided in the prior art is shown, in fig. 1, a positive tab 10 is formed at an end of the positive plate, and a positive active material 11 lithium iron phosphate is coated below the positive tab 10, but a battery based on the positive plate is severely heated during use, and can cause swelling or damage of the battery, based on which improvement is made on the structure of the positive plate provided in the prior art.
Referring to fig. 2, a schematic structural diagram of a positive electrode sheet according to an embodiment of the present utility model is provided, in which a hollow foil region 12 is disposed in the middle of a positive electrode active material 11 of the positive electrode sheet, for heat dissipation, where the hollow foil region 12 does not contain the positive electrode active material 11, and the hollow foil region 12 does not generate heat during charging and discharging, and is in a rectangular or bent strip shape, and is disposed in a middle section, a middle front section or a middle rear section of a region where the positive electrode active material is located, and the occupied area of the hollow foil region is 10% -25% of the occupied area of the positive electrode active material, for example, but not limited to 10%, 13%, 18%, 22%, 25% and the like. The width of the empty foil area 12 is 1-10mm, the positive electrode active material 11 is lithium iron phosphate, a positive electrode lug 10 is formed at the end part of the positive electrode plate, and the positive electrode lug 10 is connected with a positive electrode post of the battery cell.
Preferably, the empty foil region 12 has a width of 3-5mm.
It should be noted that, the width of the empty foil area 12 is set in association with the actual anode coating capability, and if the width is lower than a certain value, the coating may not be performed, and if the width is higher than a certain value, the energy density may be significantly reduced, so that in the actual application process, the width of the empty foil area 12 may be set according to the actual application scenario, and is not limited to the set range of the above values.
In some embodiments, the positive tab is connected to the positive post by welding.
In some embodiments, when the positive electrode sheet is coated, a hollow foil region 12 with a width of about 3mm and containing no lithium iron phosphate is arranged in the middle of the region where the lithium iron phosphate positive electrode active material 11 is arranged (for example, the width of the region where the lithium iron phosphate positive electrode active material 11 is arranged is 30mm, and then the hollow foil regions 12 are arranged at the positions of about 1.5mm at the middle 15 mm), so that the battery is prevented from being excessively damaged due to middle heating of the battery during the use process of the later assembled battery.
In some embodiments, if the positive electrode coating capability is strong when the positive electrode sheet is coated, the hollow foil region 12 containing no lithium iron phosphate with a width of about 5mm is left in the middle position of the region where the lithium iron phosphate positive electrode active material 11 is located, so that excessive heat generated in the middle of the battery during the use of the later assembled battery can be avoided to a greater extent.
In practical applications, the width of the empty foil region 12 may be set to any value in the 3-5mm range, for example, 3.5mm, 3.7mm, 4.3mm, or 4.5mm, 5mm, etc., which is not limited herein.
In some embodiments, when the positive plate is coated, an empty foil area 12 with the width of 3-5mm is added in the middle of the dressing, and after the battery is assembled, the positive active material 11 is not arranged in the middle in the charging and discharging process, the processes of removing and inserting active lithium are not generated, and heat is not generated in the middle part; meanwhile, the middle hollow foil can play a role in heat dissipation, so that the temperature of the large surface of the battery is obviously reduced. And further, the high temperature condition in the use process of the battery is reduced, gas production is reduced, the capacity retention rate of the battery is improved, and the uniformity of the pole pieces and the cladding of the positive electrode and the negative electrode are not influenced.
In some embodiments, the type and amount of the binder that may be used in the application of the positive electrode sheet may be one or more of a fluorine-containing resin and a polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) and styrene-butadiene rubber (SBR), and generally, the amount of the binder is 0.01 to 10 wt%, preferably 0.02 to 5 wt%, based on the weight of the positive electrode active material, depending on the type of the binder used, and in the practical application, the type and amount of the binder selected in the application of the positive electrode sheet may be selected depending on the practical application, without limitation.
In some embodiments, the material of the hollow foil region 12 may be aluminum foil.
Referring to fig. 3, a schematic structural diagram of a negative electrode sheet according to an embodiment of the present utility model is shown in fig. 3, wherein a negative electrode tab 13 is formed at an end of the negative electrode sheet, the negative electrode tab 13 is connected to a negative electrode post of the battery cell, and a negative electrode active material 14 of the negative electrode sheet is graphite.
In some embodiments, the negative electrode tab is connected to the negative electrode post by welding.
In some embodiments, the type and content of the negative electrode binder used in the application of the negative electrode sheet are one or more of fluorine-containing resin and polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), styrene-butadiene rubber (SBR), hydroxypropyl methylcellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, and polyvinyl alcohol, and generally, the content of the negative electrode binder is 0.01 to 10 wt%, preferably 0.02 to 5 wt%, based on the weight of the negative electrode active material, depending on the type of binder used, and in practical application, the type and content of the binder selected in the application of the negative electrode sheet may be selected in practical application, without limitation.
In some embodiments, after the preparation of the battery cell is completed, the battery cell is dried by adopting the following process, firstly, the battery cell to be dried is placed in a closed cavity, the constant temperature of the cavity is set, the circulation actions of vacuumizing and discharging the vacuum are carried out for a plurality of times, and a circulating gas flow is formed in the closed wall body, so that the battery cell is dried. The method specifically comprises the following steps:
step 1: placing the battery cell in a drying cavity filled with drying air, vacuumizing to a vacuum degree of 85-95 kPa, and heating to a system temperature of 80-105 ℃;
step 2: maintaining the temperature of the system at 80-105 ℃ and the vacuum degree at 85-95 kPa, and blowing air for 2.5-4 hours in the drying cavity;
step 3: maintaining the system temperature at 80-105 ℃, vacuumizing the drying cavity to a vacuum degree of 10-30 Pa, and maintaining the pressure; the time used in the step is 5-8 h.
In some embodiments, after the drying of the cells is completed, the cooling is performed by first stopping the system heating and turning on the air blast cycle for 10-30min, and when the system temperature to be heated is 60 ℃ or below, turning off the air blast to perform the next battery preparation.
On the other hand, the utility model also provides a battery, which comprises the battery cell.
In some embodiments, the battery electrolyte may be a non-aqueous electrolyte, which is a mixed solution of electrolyte lithium salt and non-aqueous solvent, and is not particularly limited, for example, a conventional non-aqueous electrolyte in the art may be used, such as one or more of lithium hexafluorophosphate (LiPF 6), lithium perchlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium halide, lithium chloroaluminate and lithium fluorocarbon sulfonate, the organic solvent is selected from a mixed solution of chain acid ester and cyclic acid ester, wherein the chain acid ester may be dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), methyl Propyl Carbonate (MPC), dipropyl carbonate (DPC) and at least one of other organic esters having a chain shape containing fluorine, sulfur or unsaturated bonds, and the cyclic acid ester may be at least one of Ethylene Carbonate (EC), propylene Carbonate (PC), ethylene carbonate (VC), gamma-butyrolactone (γ -BL), sultone and other organic esters having a cyclic bond or unsaturated bonds, and the concentration of at least one of 1.0 to 2.5 g is generally injected into the electrolyte.
Compared with the prior art, the utility model reduces the temperature through the outer coating without additionally adding a battery external heat dissipation structure, and the volume energy density of the battery can not be obviously reduced only by arranging the empty foil region 12 in the middle of the positive electrode active material 11 of the positive electrode plate, the empty foil region 12 does not contain the positive electrode active material 11, and the empty foil region 12 does not generate heat in the charging and discharging process, so that the large-surface temperature of the battery can be further reduced, and the cycle performance of the battery is improved.
In some embodiments, after the above-mentioned electric core is assembled into a battery, a detection cabinet is used to perform charge and discharge test while collecting the process temperature, and the temperature sampling point is located in the middle of the large surface of the battery. And adopting certain charge and discharge conditions (self-definition) at normal temperature, collecting temperature data in the process of collecting temperature data by using a temperature sensing wire self-contained on a test cabinet, and collecting the large-surface temperature in the process of charging and discharging the battery, wherein the test result is shown in table 1.
TABLE 1
As can be seen from table 1, the maximum temperature of the first group of the control experiments (the battery assembled from the positive electrode sheets provided in the prior art) was 35.12 ℃, the maximum temperature of the second group was 34.78 ℃, the maximum temperature of the third group was 34.94 ℃, the average maximum temperature in the control experiments was about 34.95 ℃, and the maximum temperature of the first group of the experiments (the battery assembled from the positive electrode sheets provided in the present utility model) was 32.47 ℃, which was reduced by 2.65 ℃ compared to the maximum temperature of the first group of the control experiments, 35.12 ℃; the maximum temperature of the second group was 32.66 ℃, which was a 2.12 ℃ drop in temperature compared to the maximum temperature of the second group of 34.78 ℃ for the control experiment; the maximum temperature of the third group is 32.69 ℃, compared with the maximum temperature 34.94 ℃ of the third group in the control experiment, the temperature is reduced by 2.25 ℃, the average maximum temperature in the first group in the experiment is about 32.61 ℃ and is 2.34 ℃ lower than the average temperature in the control experiment, and the large-area temperature of the battery assembled by the positive plate provided by the utility model in the charging and discharging process is lower.
The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present utility model within the scope of the technical concept of the present utility model, and all the simple modifications belong to the protection scope of the present utility model.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the utility model can be made without departing from the spirit of the utility model, which should also be considered as disclosed herein.
Claims (9)
1. A battery cell, comprising: the positive electrode plate and the negative electrode plate are characterized in that,
an empty foil area is arranged in the middle of the positive electrode active material of the positive electrode plate and used for heat dissipation, wherein the empty foil area does not contain the positive electrode active material, and the end part of the positive electrode plate forms a positive electrode lug.
2. The cell of claim 1, wherein the void foil region is provided in a middle section, a middle front section, or a middle rear section of the region where the positive electrode active material is located.
3. The cell of claim 1, wherein the empty foil region occupies 10% -25% of the area occupied by the positive electrode active material.
4. The cell of claim 1, wherein the hollow foil region is rectangular or in the shape of a bent strip.
5. The cell of claim 1, wherein the void foil region has a width of 1-10mm.
6. A cell according to claim 3, wherein the width of the void foil region is 3-5mm.
7. The cell of claim 1, wherein the positive electrode active material is lithium iron phosphate.
8. The cell of claim 1, wherein the negative active material of the negative electrode sheet is graphite.
9. A battery comprising the cell of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320297824.4U CN220021305U (en) | 2023-02-15 | 2023-02-15 | Battery cell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320297824.4U CN220021305U (en) | 2023-02-15 | 2023-02-15 | Battery cell and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220021305U true CN220021305U (en) | 2023-11-14 |
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ID=88674990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320297824.4U Active CN220021305U (en) | 2023-02-15 | 2023-02-15 | Battery cell and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220021305U (en) |
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- 2023-02-15 CN CN202320297824.4U patent/CN220021305U/en active Active
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