CN222394862U - Battery core structure and battery - Google Patents
Battery core structure and battery Download PDFInfo
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- CN222394862U CN222394862U CN202420465728.0U CN202420465728U CN222394862U CN 222394862 U CN222394862 U CN 222394862U CN 202420465728 U CN202420465728 U CN 202420465728U CN 222394862 U CN222394862 U CN 222394862U
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- 239000000178 monomer Substances 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 11
- 229910052744 lithium Inorganic materials 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000007774 positive electrode material Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 239000007773 negative electrode material Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 81
- 229910052782 aluminium Inorganic materials 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- 239000010949 copper Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 239000006183 anode active material Substances 0.000 description 5
- 239000011888 foil Substances 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Classifications
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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
-
- 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
本实用新型涉及电池技术领域，公开了一种电池卷芯结构和电池，电池卷芯结构包括：正极片；负极片；双极片，设置于正极片与负极片之间；双极片沿厚度方向靠近正极片的一侧设置有第一负极层，第一负极层适于将双极片与正极片串联；双极片沿厚度方向靠近负极片的一侧设置有第一正极层，第一正极层适于将双极片与负极片串联；双极片适于与正极片和负极片共同卷绕成为内部串联的极组单体。本实用新型所提供的电池卷芯结构，能够使得卷绕后的极组单体的内部形成正极片‑第一负极层‑第一正极层‑负极片的内部串联结构，不仅成倍的提高了极组单体的输出电压，而且减少了极组单体外部的串联连接，有利于提高电池成组的灵活性。
The utility model relates to the technical field of batteries, and discloses a battery core structure and a battery, wherein the battery core structure comprises: a positive electrode sheet; a negative electrode sheet; a bipolar sheet, which is arranged between the positive electrode sheet and the negative electrode sheet; a first negative electrode layer is arranged on the side of the bipolar sheet close to the positive electrode sheet along the thickness direction, and the first negative electrode layer is suitable for connecting the bipolar sheet and the positive electrode sheet in series; a first positive electrode layer is arranged on the side of the bipolar sheet close to the negative electrode sheet along the thickness direction, and the first positive electrode layer is suitable for connecting the bipolar sheet and the negative electrode sheet in series; the bipolar sheet is suitable for being wound together with the positive electrode sheet and the negative electrode sheet to form an internally series-connected electrode group monomer. The battery core structure provided by the utility model can form an internal series structure of positive electrode sheet-first negative electrode layer-first positive electrode layer-negative electrode sheet inside the wound electrode group monomer, which not only increases the output voltage of the electrode group monomer by multiples, but also reduces the external series connection of the electrode group monomer, which is conducive to improving the flexibility of battery grouping.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery winding core structure and a battery.
Background
The lithium ion battery has the advantages of high specific capacity, small self-discharge rate and the like, and has been widely applied to portable electronic equipment, electric automobiles, large-scale energy storage facilities and the like since commercialization. The winding core of the existing cylindrical battery is of a winding structure of positive electrode, diaphragm and negative electrode, the single voltage is 3V-4V, and a mode of connecting a plurality of single units in series is generally needed in the actual use process so as to improve the overall output voltage.
Therefore, the conventional cylindrical battery with a winding structure of positive electrode, separator and negative electrode cannot raise the output voltage, and has a complicated grouping mode.
Disclosure of utility model
In view of this, the utility model provides a battery winding core structure and a battery, so as to solve the problems that the winding core of the existing cylindrical battery cannot raise the output voltage and the grouping mode is complex.
In a first aspect, the present utility model provides a battery winding core structure, including:
A positive plate;
A negative electrode sheet;
The double pole pieces are arranged between the positive pole piece and the negative pole piece; the bipolar plate is provided with a first positive electrode layer on one side close to the positive electrode plate in the thickness direction, and the first positive electrode layer is suitable for connecting the bipolar plate with the positive electrode plate in series;
the bipolar plate is suitable for being wound together with the positive plate and the negative plate to form a pole group monomer connected in series inside.
Compared with the winding core of the cylindrical battery in the related art, the winding core structure of the battery has the advantages that the double-pole piece is arranged between the positive pole piece and the negative pole piece to be wound together into the pole group unit, the first negative pole layer is arranged on one side, close to the positive pole piece, of the double-pole piece in the thickness direction, and the first positive pole layer is arranged on one side, close to the negative pole piece, of the double-pole piece in the thickness direction, so that the double-pole piece is connected with the positive pole piece in series through the first negative pole layer, and meanwhile, the double-pole piece is connected with the negative pole piece in series through the first positive pole layer, so that the internal series structure of the positive pole piece, the first negative pole layer and the first positive pole layer is formed inside the wound pole group unit, the output voltage of the pole group unit is improved in a multiple mode, the serial connection of the outside of the pole group unit is reduced, and the battery group unit is improved.
In an alternative embodiment, the battery core structure further comprises:
The first diaphragm is arranged between the first negative electrode layer and the positive electrode plate, one side of the first diaphragm in the thickness direction is suitable for being attached to the first negative electrode layer, and the other side of the first diaphragm is suitable for being attached to the positive electrode plate;
And the second diaphragm is arranged between the first positive electrode layer and the negative electrode plate, one side of the second diaphragm in the thickness direction is suitable for being attached to the first positive electrode layer, and the other side is suitable for being attached to the negative electrode plate.
The electrolyte has the beneficial effects that the first diaphragm is arranged between the first negative electrode layer and the positive electrode plate to isolate, so that short circuit caused by direct contact between the first negative electrode layer and the positive electrode plate is avoided, ions in the electrolyte freely pass through between the first negative electrode layer and the positive electrode plate, electrons between the first negative electrode layer and the positive electrode plate are prevented from freely passing through, the second diaphragm is arranged between the first positive electrode layer and the negative electrode plate to avoid short circuit caused by direct contact between the first positive electrode layer and the negative electrode plate, the ions in the electrolyte freely pass through between the first positive electrode layer and the negative electrode plate, and electrons between the first positive electrode layer and the negative electrode plate are prevented from freely passing through, so that the charge-discharge performance of a pole group monomer is ensured.
In an alternative embodiment, the battery winding core structure further comprises a third diaphragm, the third diaphragm is attached to one side, away from the positive plate, of the negative plate in the thickness direction, and the third diaphragm is suitable for wrapping the negative plate in the winding process;
the third diaphragm is suitable for being wound together with the first diaphragm, the second diaphragm, the double-pole piece, the positive pole piece and the negative pole piece to form a pole group monomer with internal series connection.
The beneficial effects are that: in the winding process, the positive plate is arranged in the winding core, the third diaphragm is externally coated with the negative plate, and the third diaphragm is coated outside the winding core in the winding process, so that a winding core internal series structure of the positive plate, the first diaphragm, the first negative plate, the first positive plate, the second diaphragm, the negative plate and the third diaphragm is formed, on one hand, the risk of direct contact of the positive plate and the negative plate caused by fluctuation of the manufacturing process can be avoided, on the other hand, the contact conduction between the negative plate and the aluminum shell in the using process can be avoided, and corrosion to the aluminum shell is prevented.
In an alternative embodiment, the bipolar plate further comprises a first current collector, wherein a side of the first current collector, which is close to the positive plate in the thickness direction, is suitable for coating the first negative electrode layer, and a side of the first current collector, which is close to the negative plate in the thickness direction, is suitable for coating the first positive electrode layer.
The double-pole-piece current collector has the beneficial effects that the first current collector is arranged, so that a carrier is provided for the first negative electrode layer and the first positive electrode layer of the double-pole-piece, and current conduction is realized in the charging and discharging process.
In an alternative embodiment, the positive electrode sheet includes a second positive electrode layer and a second current collector, both sides in the thickness direction of the second current collector being adapted to be coated with the second positive electrode layer.
The positive electrode plate has the beneficial effects that the second current collector is arranged, so that a carrier is provided for the second positive electrode layer of the positive electrode plate, and current conduction is realized in the charging and discharging process.
In an alternative embodiment, the battery winding core structure further comprises a positive electrode connecting sheet;
One side of the width direction of the second current collector is provided with a first connecting part, the first connecting part is formed by extending the edge of the second current collector along the width direction towards the direction far away from the second current collector, and the first connecting part is suitable for being welded or integrally formed with the positive electrode connecting sheet.
The positive electrode connecting piece has the beneficial effects that the first connecting part is arranged on one side of the second current collector in the width direction, so that the positive electrode connecting piece is convenient to firmly and stably connect with the positive electrode connecting piece of the subsequent winding core through the first connecting part.
In an alternative embodiment, the negative electrode sheet includes a second negative electrode layer and a third current collector, both sides in the thickness direction of the third current collector being adapted to be coated with the second negative electrode layer.
The negative electrode plate has the beneficial effects that the third current collector is arranged, so that a carrier is provided for the second negative electrode layer of the negative electrode plate, and current conduction is realized in the charging and discharging process.
In an alternative embodiment, the battery core structure further comprises a negative electrode tab;
And one side of the third current collector in the width direction is provided with a second connecting part, the second connecting part is formed by extending the edge of the third current collector along the width direction towards the direction far away from the third current collector, and the second connecting part is suitable for being welded or integrally formed with the negative electrode connecting sheet.
The negative electrode connecting piece has the beneficial effects that the second connecting part is arranged on one side of the third current collector in the width direction, so that the negative electrode connecting piece is convenient to firmly and stably connect with the negative electrode connecting piece of the subsequent winding core through the second connecting part.
In an alternative embodiment, the first positive electrode layer comprises a lithiated positive electrode material comprising lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel manganese oxide, and lithium-rich manganese groups;
the first negative electrode layer includes a negative electrode active material including graphite and lithium titanate.
In a second aspect, the utility model also provides a battery, which comprises a battery body and the battery winding core structure.
Advantageous effects the battery of the second aspect includes the battery cell structure of the first aspect, and thus the battery of the second aspect includes all the advantageous effects of the battery cell structure of the first aspect.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an explosion structure of a battery winding core structure before winding according to an embodiment of the present utility model;
Fig. 2 is a schematic cross-sectional structure of a double-pole piece of a battery winding core structure according to an embodiment of the present utility model;
Fig. 3 is a schematic front view of a battery winding core structure before winding according to an embodiment of the present utility model;
FIG. 4 is a schematic view of another exploded view of a battery core structure prior to winding according to an embodiment of the present utility model;
Fig. 5 is a schematic cross-sectional view of a battery winding core structure after winding according to an embodiment of the present utility model;
Fig. 6 is a schematic cross-sectional structure of a positive plate of a battery winding core structure according to an embodiment of the present utility model;
Fig. 7 is a schematic cross-sectional view of a negative electrode sheet of a battery winding core structure according to an embodiment of the present utility model.
Reference numerals illustrate:
10. the positive electrode plate, 11, a second positive electrode layer, 12, a second current collector, 121, a first connecting part;
20. A negative electrode sheet, 21, a second negative electrode layer, 22, a third current collector, 221, a second connecting portion;
30. a double pole piece; 31, a first negative electrode layer, 32, a first positive electrode layer, 33, a first current collector;
41. first diaphragm, 42, second diaphragm, 43 and third diaphragm.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Embodiments of the present utility model are described below with reference to fig. 1 to 7.
According to an embodiment of the present utility model, in one aspect, there is provided a battery winding core structure including:
a positive electrode sheet 10;
a negative electrode sheet 20;
As shown in fig. 2 and 5, a first negative electrode layer 31 is arranged on one side, close to the positive electrode plate 10, of the bipolar plate 30 in the thickness direction, wherein the first negative electrode layer 31 is isolated from the positive electrode plate 10 by a diaphragm, the first negative electrode layer 31 is suitable for connecting the bipolar plate 30 and the positive electrode plate 10 in series, and a first positive electrode layer 32 is arranged on one side, close to the negative electrode plate 20, of the bipolar plate 30 in the thickness direction, wherein the first positive electrode layer 32 is isolated from the negative electrode plate 20 by a diaphragm, and the first positive electrode layer 32 is suitable for connecting the bipolar plate 30 and the negative electrode plate 20 in series;
The bipolar plate 30 is adapted to be wound together with the positive and negative electrode plates 10, 20 into an internal series of electrode stack units.
It should be noted that, the winding core of the cylindrical battery in the related art is a winding structure of positive electrode-diaphragm-negative electrode, the single voltage is between 3V and 4V, and in the actual use process, a mode of connecting a plurality of single units in series is generally needed to improve the overall output voltage, and the grouping mode is complex.
Compared with the winding core of a cylindrical battery in the related art, the winding core structure of the battery provided by the utility model has the advantages that the bipolar plate 30, the positive plate 10 and the negative plate 20 are wound together into the electrode group single body by arranging the bipolar plate 30 between the positive plate 10 and the negative plate 20, and the output voltage of the electrode group single body is doubled, the serial connection of the outside of the electrode group single body is reduced by arranging the first negative electrode layer 31 on one side of the bipolar plate 30 close to the positive plate 10 in the thickness direction and arranging the first positive electrode layer 32 on one side of the bipolar plate 30 close to the negative plate 20 in the thickness direction, so that the bipolar plate 30 and the positive plate 10 are connected in series by the first positive electrode layer 32, and meanwhile, the internal serial connection structure of the positive plate 10-first negative electrode layer 31-first positive electrode layer 32-negative plate 20 is formed inside of the wound electrode group single body, so that the battery grouping flexibility is improved.
In some embodiments, as shown in fig. 1 and fig. 4, the battery winding core structure further includes:
A first separator 41 disposed between the first negative electrode layer 31 and the positive electrode sheet 10, one side of the first separator 41 in the thickness direction being adapted to be bonded to the first negative electrode layer 31, and the other side being adapted to be bonded to the positive electrode sheet 10;
And a second separator 42 disposed between the first positive electrode layer 32 and the negative electrode sheet 20, wherein one side of the second separator 42 in the thickness direction is adapted to be bonded to the first positive electrode layer 32, and the other side is adapted to be bonded to the negative electrode sheet 20.
The first separator 41 is disposed between the first negative electrode layer 31 and the positive electrode sheet 10 to avoid short circuit caused by direct contact between the first negative electrode layer 31 and the positive electrode sheet 10, and to allow ions in the electrolyte solution to pass freely between the first negative electrode layer 31 and the positive electrode sheet 10 while preventing electrons between the first negative electrode layer 31 and the positive electrode sheet 10 from passing freely, and the second separator 42 is disposed between the first positive electrode layer 32 and the negative electrode sheet 20 to avoid short circuit caused by direct contact between the first positive electrode layer 32 and the negative electrode sheet 20, so that ions in the electrolyte solution pass freely between the first positive electrode layer 32 and the negative electrode sheet 20 while preventing electrons between the first positive electrode layer 32 and the negative electrode sheet 20 from passing freely, thereby ensuring charge and discharge performance of the electrode group unit.
In some embodiments, as shown in fig. 1 and fig. 4, the battery winding core structure further includes a third separator 43, where the third separator 43 is attached to a side of the negative electrode sheet 20 away from the positive electrode sheet 10 in the thickness direction, and the third separator 43 is adapted to cover the negative electrode sheet 20 during the winding process;
The third separator 43 is adapted to be wound together with the first separator 41, the second separator 42, the bipolar plate 30, the positive electrode plate 10 and the negative electrode plate 20 into a single body of a pole group connected in series inside.
The third diaphragm 43 operates on the same principle as the first and second diaphragms 41 and 42. In addition, as shown in fig. 3, in the winding process, the positive electrode sheet 10 is inside the winding core, the third separator 43 is coated outside the negative electrode sheet 20, and the third separator 43 is coated outside the winding core in the winding process, so as to form a winding core internal series structure of the positive electrode sheet 10-the first separator 41-the first negative electrode layer 31-the first positive electrode layer 32-the second separator 42-the negative electrode sheet 20-the third separator 43, which can avoid the risk of direct contact between the positive electrode and the negative electrode due to fluctuation of the manufacturing process, and can avoid the contact conduction between the negative electrode sheet 20 and the aluminum shell during the use process, thereby preventing corrosion to the aluminum shell.
In some embodiments, referring to fig. 2, the bipolar plate 30 further includes a first current collector 33, wherein a side of the first current collector 33 adjacent to the positive plate 10 in the thickness direction is adapted to be coated with a first negative electrode layer 31, and a side of the first current collector 33 adjacent to the negative plate 20 in the thickness direction is adapted to be coated with a first positive electrode layer 32.
The first current collector 33 is a metal foil current collector, and the material of the first current collector 33 may be copper, aluminum, stainless steel, silver, zinc, or a composite material of two or more metals of copper, aluminum, stainless steel, silver, zinc, or the like. The first current collector 33 is preferably made of copper, so that the first current collector 33 is not easy to react with lithium in an alloy manner, and normal charge and discharge performance of the bipolar plate 30 and the whole electrode group monomer is ensured.
In this embodiment, the first current collector 33 is provided to provide a carrier for the first negative electrode layer 31 and the first positive electrode layer 32 of the bipolar plate 30, and to realize current conduction during charge and discharge.
In some embodiments, referring to fig. 6, the positive electrode sheet 10 includes a second positive electrode layer 11 and a second current collector 12, and both sides of the second current collector 12 in the thickness direction are adapted to be coated with the second positive electrode layer 11.
The second current collector 12 is a metal foil current collector, and the material of the second current collector 12 may be aluminum, copper, stainless steel, silver, zinc, or a composite material of two or more metals of aluminum, copper, stainless steel, silver, zinc, or the like. The second current collector 12 is preferably made of aluminum so as to improve oxidation resistance of the second current collector 12. The second positive electrode layer 11 is provided with a coating layer containing a lithiated positive electrode material including lithium nickel cobalt manganese oxide (NMC), lithium iron phosphate (LFP), lithium Nickel Manganese Oxide (LNMO), lithium-rich manganese base (LRM), and the like.
In this embodiment, the second current collector 12 is provided to provide a carrier for the second positive electrode layer 11 of the positive electrode sheet 10, and realize current conduction in the charge and discharge process.
In some embodiments, the battery core structure further comprises a positive electrode tab;
As shown in fig. 1 and 3, a first connecting portion 121 is disposed on one side of the second current collector 12 in the width direction, the first connecting portion 121 is formed by extending the edge of the second current collector 12 along the width direction in a direction away from the second current collector 12, and the first connecting portion 121 is suitable for welding or integrally forming with the positive electrode connecting sheet.
The first connection portion 121 and the second current collector 12 are integrally formed, and the first connection portion 121 is a metal foil without a coating.
In this embodiment, the first connection portion 121 is disposed at one side of the second current collector 12 in the width direction, so that the positive electrode connection piece of the subsequent winding core can be firmly and stably connected with the first connection portion 121.
In some embodiments, referring to fig. 7, the negative electrode sheet 20 includes a second negative electrode layer 21 and a third current collector 22, and both sides in the thickness direction of the third current collector 22 are adapted to coat the second negative electrode layer 21.
The third current collector 22 is a metal foil current collector, and the material of the third current collector 22 may be copper, aluminum, stainless steel, silver, zinc, or a composite material of two or more metals of copper, aluminum, stainless steel, silver, zinc, or the like. The third current collector 22 is preferably copper. The second anode layer 21 is a coating layer having an anode active material containing a material capable of reversibly intercalating lithium ions, and the anode active material includes graphite, lithium titanate, and the like.
In this embodiment, the third current collector 22 is provided to provide a carrier for the second negative electrode layer 21 of the negative electrode sheet 20, and to realize current conduction during charge and discharge.
In some embodiments, the battery core structure further comprises a negative electrode tab;
As shown in fig. 1 and fig. 3, a second connecting portion 221 is disposed on one side of the third current collector 22 in the width direction, the second connecting portion 221 is formed by extending the edge of the third current collector 22 along the width direction in a direction away from the third current collector 22, and the second connecting portion 221 is suitable for welding or integrally forming with the negative electrode connecting sheet.
The second connection portion 221 is integrally formed with the third current collector 22, and the second connection portion 221 is a metal foil without a coating.
In this embodiment, the second connection portion 221 is provided on one side of the third current collector 22 in the width direction, so that the second connection portion 221 facilitates firm and stable connection with the negative electrode connection tab of the subsequent winding core.
In some embodiments, the first positive electrode layer 32 comprises a lithiated positive electrode material comprising lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel manganese oxide, and lithium-rich manganese groups;
The first anode layer 31 includes an anode active material including graphite and lithium titanate.
The material of the first positive electrode layer 32 is the same as the coating material of the second positive electrode layer 11, and the first positive electrode layer 32 has a coating layer containing a lithiated positive electrode material including lithium nickel cobalt manganese oxide (NMC), lithium iron phosphate (LFP), lithium Nickel Manganese Oxide (LNMO), lithium-rich manganese base (LRM), and the like. The material of the first anode layer 31 is the same as the coating material of the second anode layer 21, and the first anode layer 31 is a coating layer having an anode active material containing lithium ions capable of reversibly deintercalating, and the anode active material includes graphite, lithium titanate, and the like.
According to an embodiment of the utility model, in another aspect, a battery is provided, which comprises a battery body and the battery winding core structure.
The battery in this scheme includes foretell battery core structure, therefore, the battery in this scheme includes the whole beneficial effect of foretell battery core structure.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420465728.0U CN222394862U (en) | 2024-03-11 | 2024-03-11 | Battery core structure and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420465728.0U CN222394862U (en) | 2024-03-11 | 2024-03-11 | Battery core structure and battery |
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| CN222394862U true CN222394862U (en) | 2025-01-24 |
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| CN202420465728.0U Active CN222394862U (en) | 2024-03-11 | 2024-03-11 | Battery core structure and battery |
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