CN114361563A - Battery cell structure and battery - Google Patents
Battery cell structure and battery Download PDFInfo
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- CN114361563A CN114361563A CN202210013204.3A CN202210013204A CN114361563A CN 114361563 A CN114361563 A CN 114361563A CN 202210013204 A CN202210013204 A CN 202210013204A CN 114361563 A CN114361563 A CN 114361563A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a cell structure, comprising: the diaphragm is positioned between the first pole piece and the second pole piece, wherein the first pole piece is provided with a first pole lug and a second pole lug, the first pole lug and the second pole lug are positioned on the same surface or the opposite surfaces of the first pole piece, and the second pole piece is provided with a third pole lug; in the discharging process, the first lug, the second lug and the third lug are connected with a discharging circuit, or the first lug or the second lug and the third lug are connected with the discharging circuit; in the charging process, the first lug or the second lug and the third lug are connected with a charging circuit. According to the invention, the first lug, the second lug and the third lug are used in the discharging process, or the second lug and the third lug are connected, so that the effects of reducing the internal resistance of the battery and improving the amplification factor can be achieved, and meanwhile, the situation of lithium precipitation of the battery can be effectively reduced by using the first lug and the third lug in the charging process.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a battery cell structure and a battery.
Background
Lithium ion batteries are widely used in mobile electronic products because they can support high rate discharge. With the continuous improvement of the performance of mobile electronic products, higher requirements are put forward on the energy density and the supportable high-rate performance of the lithium ion battery. In the prior art, a tab in a lithium ion battery is arranged in the middle of a pole piece so as to improve the energy density of the lithium ion battery and support high-rate performance. However, in the related art, the tab is arranged in the middle of the pole piece, so that the internal resistance of the battery is reduced, the constant-current charging time of the lithium ion battery is long, and the problem of serious lithium precipitation of the lithium ion battery is caused.
Therefore, the problem of serious lithium precipitation during the charging process of the lithium ion battery exists in the related technology.
Disclosure of Invention
The embodiment of the invention provides a battery cell structure, which aims to solve the problem that lithium ion batteries in the prior art seriously separate lithium in the charging process.
To achieve the above object, an embodiment of the present invention provides a battery cell structure, including: a first pole piece, a second pole piece, and a separator between the first and second pole pieces,
the first pole piece is provided with a first pole lug and a second pole lug, the first pole lug and the second pole lug are positioned on the same surface or the opposite surface of the first pole piece, and the second pole piece is provided with a third pole lug;
in the discharging process, the first lug, the second lug and the third lug are connected with a discharging circuit, or the first lug or the second lug and the third lug are connected with the discharging circuit;
in the charging process, the first lug or the second lug and the third lug are connected with a charging circuit.
As an optional embodiment, the first pole piece includes a first current collector, a first smear and a second smear, the first smear is coated on a first surface of the first current collector, and the second smear is coated on a second surface of the first current collector opposite to the first surface;
the second pole piece comprises a second current collector, a third smear and a fourth smear, the third smear is coated on the first surface of the second current collector, and the fourth smear is coated on the second surface of the second current collector opposite to the first surface.
As an alternative embodiment, the surface of the first smear is provided with a first groove and a second groove, wherein,
the first tab is located in the first groove, and the second tab is located in the second groove.
As an alternative embodiment, the surface of the first smear is provided with a third groove, wherein,
the first smear is coated on a first area of the first surface of the first current collector, and a second area of the first surface of the first current collector is adjacent to the first area;
the first tab is located in a second area of the first surface of the first current collector, and the second tab is located in the third groove.
As an alternative embodiment, the first smear is coated on a first area of the first surface of the first current collector, the second area of the first surface of the first current collector is adjacent to the first area, and the third area of the first surface of the first current collector is located on a side of the first area of the first surface of the first current collector away from the second area of the first surface of the first current collector;
the first tab is located in a second area of the first surface of the first current collector, and the second tab is located in a third area of the first surface of the first current collector.
As an alternative embodiment, the surface of the first smear is provided with a fourth groove and the surface of the second smear is provided with a fifth groove, wherein,
the first tab is positioned in the fourth groove; the second pole lug is positioned in the fifth groove.
As an alternative embodiment, the surface of the first smear is provided with a sixth groove, wherein,
the second smear is coated on a first area of the second surface of the first current collector, the second area of the second surface of the first current collector being adjacent to the first area of the second surface;
the first tab is located in the sixth groove, and the second tab is located in a second area of the second surface of the first current collector.
As an alternative embodiment, the first smear is coated on a first area of the first surface of the first current collector, the first tab is located on a second area of the first surface of the first current collector, and the first area and the second area of the first surface of the first current collector are adjacent;
the second smear is applied to a first area of the second surface of the first current collector, the second tab is located in a second area of the second surface of the first current collector, and the second area of the second surface of the first current collector is adjacent to the first area of the second surface of the first current collector.
As an alternative embodiment, the surface of the third smear is provided with a seventh recess, in which the third tab is located.
As an alternative embodiment, the third smear is coated on the first area of the first surface of the second current collector, the first area of the first surface of the second current collector is adjacent to the second area, and the third tab is located on the second area of the first surface of the second current collector.
The embodiment of the invention also provides a battery, which comprises the battery cell structure.
One of the above technical solutions has the following advantages or beneficial effects:
according to the invention, the effects of reducing the internal resistance of the battery and improving the amplification factor can be achieved by using the first lug, the second lug and the third lug in the discharging process, and meanwhile, the situation of lithium precipitation of the battery can be effectively reduced by using the first lug and the third lug in the charging process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a front pole piece of a battery cell formed by winding a first pole piece and a second pole piece according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating connection between a front electrode sheet and an external circuit, the front electrode sheet being formed by winding a first electrode sheet and a second electrode sheet according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a charging and discharging process according to an embodiment of the present invention;
FIG. 4 is a second schematic diagram of the charge/discharge process provided by the embodiment of the present invention
Fig. 5 is a schematic structural diagram of another front pole piece of a cell formed by winding a first pole piece and a second pole piece according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first pole piece according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another first pole piece according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another first pole piece according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of another first electrode tab according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of another first pole piece according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of another first electrode plate according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another first pole piece according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a second pole piece according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of another second pole piece according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a battery roll core structure provided by an embodiment of the invention;
fig. 16 is a schematic diagram of another battery roll core structure provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a front pole piece of a cell formed by winding a first pole piece and a second pole piece, according to an embodiment of the present invention, as shown in fig. 1, the cell structure includes: a first pole piece 10, a second pole piece 20, and a separator 30 positioned between the first and second pole pieces, wherein,
the first pole piece 10 is provided with a first pole lug 11 and a second pole lug 12, the first pole lug 11 and the second pole lug 12 are positioned on the same surface or the opposite surface of the first pole piece 10, and the second pole piece 20 is provided with a third pole lug 21;
in the discharging process, the first tab 11, the second tab 12 and the third tab 21 are connected with a discharging circuit, or the first tab 11 or the second tab 12 and the third tab 21 are connected with the discharging circuit;
during charging, the first tab 11 or the second tab 12, and the third tab 21 are connected to a charging circuit.
In this embodiment, as shown in fig. 2, the first tab 11 and the third tab 21 are used during the charging process, so that the charging process of the battery is similar to that of a common battery, and the occurrence of lithium deposition caused by the reduction of internal resistance is avoided; and in the discharging process, the first tab 11, the second tab 12 and the third tab 21 are adopted at the same time, or the first tab 11 and the third tab 21 are adopted, or the second tab 12 and the third tab 21 are adopted, so that the internal resistance of the battery can be effectively reduced, and the high-rate discharging of the battery is realized.
The first tab 11 and the second tab 12 may be disposed on the same surface or different surfaces of the first pole piece 10, but the first tab 11 and the second tab 12 need to be disposed to keep a certain distance, so as to ensure different effects of the first tab 11 and the second tab 12.
As shown in fig. 3, three tabs are welded on the circuit board, an electronic element on the circuit board can control a charging and discharging current path of the lithium ion battery, the left tab in the figure is a battery charging process diagram, and the first tab 11 and the third tab 21 are connected with a working circuit for charging; the left second and the left third are battery discharging process diagrams, wherein the second pole lug 12 and the third pole lug 21 in the left second diagram are connected with the working circuit for discharging, and the first pole lug 11, the second pole lug 12 and the third pole lug 21 in the left third diagram are connected with the working circuit for discharging.
In addition, as shown in fig. 4, three tabs are welded on the circuit board, an electronic element on the circuit board can control the charging and discharging current path of the lithium ion battery, the left tab in the figure is a battery charging process diagram, and the first tab 11 and the third tab 21 are connected with a working circuit for charging; the left second and the left third are battery discharging process diagrams, wherein the second pole lug 12 and the third pole lug 21 in the left second diagram are connected with the working circuit for discharging, and the first pole lug 11, the second pole lug 12 and the third pole lug 21 in the left third diagram are connected with the working circuit for discharging.
As an alternative embodiment, as shown in fig. 5, the first pole piece 10 includes a first current collector 101, a first smear 102 and a second smear 103, the first smear 102 is coated on a first surface of the first current collector 101, the second smear 103 is coated on a second surface of the first current collector 101, and the first surface and the second surface of the first current collector 101 are opposite;
the second pole piece 20 comprises a second current collector 201, a third smear 202 and a fourth smear 203, wherein the third smear 202 is coated on the first surface of the second current collector 201, the fourth smear 203 is coated on the second surface of the second current collector 201, and the first surface and the second surface of the second current collector 201 are opposite.
In this embodiment, the first current collector 101 and the second current collector 201 collect the current generated by the first smear 102, the second smear 103, the third smear 202 and the fourth smear 203 to form a working current in the discharging process, and distribute the current to the first smear 102, the second smear 103, the third smear 202 and the fourth smear 203 in the charging process, so as to realize the charging and discharging process of the battery.
As an alternative embodiment, the surface of the first smear 102 is provided with a first groove and a second groove, wherein,
the first tab 11 is located in the first groove, and the second tab 12 is located in the second groove.
In this embodiment, the first tab 11 is disposed in the first groove, and the second tab 12 is disposed in the second groove, so that the internal resistance of the battery can be effectively reduced in the discharging process. When the first tab 11 is arranged in the first groove, similarly to the tab middle arrangement in the related art, the first tab 11 needs to be arranged at a position close to the edge of the first smear 102 to reduce the lithium deposition.
As an alternative embodiment, as shown in fig. 6 and 7, the surface of the first smear 102 is provided with a third groove, wherein,
the first smear 102 is coated on a first area of the first surface of the first current collector 101, and a second area of the first surface of the first current collector 101 is adjacent to the first area;
the first tab 11 is located in a second area of the first surface 101 of the first current collector and the second tab 12 is located in the third recess.
In this embodiment, the simultaneous use of the first tab 11 and the second tab 12 in the discharging process can also effectively reduce the resistance and improve the discharge at a large rate. In addition, because the first tab 11 is not arranged in the first smear 102 in the charging process, the charging process is the same as that of a common battery, so that the lithium separation condition of the tab position can be effectively prevented.
As an alternative embodiment, as shown in fig. 8, the first smear 102 is coated on a first area of the first surface of the first current collector 101, a second area of the first surface of the first current collector 101 is adjacent to the first area, and a third area of the first surface of the first current collector 101 is located on a side of the first area of the first surface of the first current collector 101 away from the second area of the first surface of the first current collector;
the first tab 11 is located at a second area of the first surface of the first current collector 101, and the second tab 12 is located at a third area of the first surface of the first current collector 101.
In this embodiment, first utmost point ear 11 and second utmost point ear 12 use simultaneously in the discharge process and can effectively reduce resistance and improve big multiplying power discharge equally, and first utmost point ear 11 and second utmost point ear 12 do not all locate first smear 102's inside, can effectually avoid analyzing the lithium problem, reduce first smear 102's coating complexity simultaneously, improve process efficiency.
As an alternative embodiment, as shown in fig. 9, the surface of the first smear 102 is provided with a fourth groove, the surface of the second smear 103 is provided with a fifth groove, wherein,
the first tab 11 is located in the fifth groove, and the second tab 12 is located in the sixth groove.
In this embodiment, the first tab 11 is disposed in the fourth groove of the first smear 102, and the second tab 12 is disposed in the fifth groove of the second smear 103, so that the battery cell resistance can be reduced in the discharging process, and the effect of high-rate discharging is achieved. In addition, the first tab 11 and the third tab 13 can be charged under normal resistance, so that the occurrence of lithium deposition is reduced.
As an alternative embodiment, as shown in fig. 10 and 11, the surface of the first smear 102 is provided with a sixth groove, wherein,
the second smear 103 is coated on a first area of the second surface of the first current collector 101, and the second area of the second surface of the first current collector 101 is adjacent to the first area of the second surface;
the first tab 11 is located in the sixth groove, and the second tab 12 is located in the second area of the second surface of the first current collector 101.
In this embodiment, the first tab 11 is disposed in the sixth groove of the first smear 102, and the second tab 12 is disposed in the area of the second surface of the first current collector 101 not covered by the second smear 103, so that the effects of reducing the resistance of the battery cell and discharging at a large rate can be achieved. In addition, the working circuit connected with the first lug 11 and the third lug 13 can realize charging under the condition of normal resistance, and the occurrence of lithium precipitation of the battery is reduced.
As an alternative embodiment, as shown in fig. 12, the first smear 102 is coated on a first area of the first surface of the first current collector 101, the first tab 11 is located on a second area of the first surface of the first current collector 101, and the first area and the second area of the first surface of the first current collector 101 are adjacent;
the second smear 12 is coated on a first area of the second surface of the first current collector 101, the second tab 12 is located on a second area of the second surface of the first current collector 101, and the second area of the second surface of the first current collector 101 is adjacent to the first area of the second surface of the first current collector 101.
In this embodiment, the first tab 11 is disposed in the area of the first surface of the first current collector 101 not covered by the first smear 102, and the first tab 12 is disposed in the area of the second surface of the first current collector 101 not covered by the second smear 103 and far from the first tab 11, so that the effect of reducing the battery cell resistance can be achieved in the case of the first tab 11, the second tab 12, and the third tab 13, or the second tab 12 and the third tab 13 are connected, and the high-rate discharge effect is improved. In addition, the first tab 11 and the third tab 13 are connected to realize charging under the condition of normal resistance, so that the occurrence of lithium deposition of the battery is reduced.
As an alternative embodiment, as shown in fig. 13, the surface of the third smear 202 is provided with a seventh groove, and the third tab 21 is located in the seventh groove.
In this embodiment, similar to the tab middle-mounting process, the third tab 21 is disposed in the third tab 202, so that the energy density can be improved and the battery magnification can be improved.
As an alternative embodiment, as shown in fig. 14, the third smear 202 is coated on a first area of the first surface of the second current collector 201, the first area of the first surface of the second current collector 201 is adjacent to a second area, and the third tab 21 is located on the second area of the first surface of the second current collector 202.
In this embodiment, the third tab 21 is disposed in the second region of the first surface of the second current collector 201, so that the lithium deposition phenomenon at the edge of the third tab 21 can be reduced during the charge and discharge processes, and the battery can maintain a high energy density, thereby improving the service life of the battery.
In addition, the first current collector 101 is a positive current collector, the first smear 102 is a positive smear, and the second smear 103 is a positive smear; the second current collector 201 is a negative electrode current collector, the third smear 202 is a negative electrode smear, and the fourth smear 203 is a negative electrode smear. In this embodiment, the first current collector 101 is a positive electrode, and the second current collector 201 is a negative electrode to achieve normal operation of a battery function, and in the embodiment of the present invention, the positions of the first tab 11 and the second tab 12 of the first current collector 101 may be set to different positions in the above embodiment, and the second current collector 201, which is adapted to different positions of the third tab 21 in the above embodiment, is wound together with the separator 30 to form a battery cell structure, for example, as shown in fig. 15 and 16.
As shown in fig. 3, three tabs are welded on the circuit board, an electronic element on the circuit board can control a charging and discharging current path of the lithium ion battery, the left tab in the figure is a battery charging process diagram, and the first tab 11 and the third tab 21 are connected with a working circuit for charging; the left second and the left third are battery discharging process diagrams, wherein the second pole lug 12 and the third pole lug 21 in the left second diagram are connected with the working circuit for discharging, and the first pole lug 11, the second pole lug 12 and the third pole lug 21 in the left third diagram are connected with the working circuit for discharging.
In addition, the first current collector 101 is a negative current collector, the first smear 102 is a positive smear, and the second smear 103 is a positive smear; the second current collector 201 is a positive current collector, the third smear 202 is a positive smear, and the fourth smear 203 is a positive smear. In this embodiment, the same is true when the first current collector 101 is a negative electrode and the second current collector 201 is a positive electrode to achieve normal operation of the battery function. The positions of the first tab 11 and the second tab 12 of the first current collector 101 in the different embodiments described above may be adopted, and the positions of the third tab 21 of the second current collector 201 in the different embodiments described above may all form a cell structure, which is not described herein again.
As shown in fig. 4, three tabs are welded on the circuit board, an electronic element on the circuit board can control a charging and discharging current path of the lithium ion battery, the left tab in the figure is a battery charging process diagram, and the first tab 11 and the third tab 21 are connected with a working circuit for charging; the left second and the left third are battery discharging process diagrams, wherein the second pole lug 12 and the third pole lug 21 in the left second diagram are connected with the working circuit for discharging, and the first pole lug 11, the second pole lug 12 and the third pole lug 21 in the left third diagram are connected with the working circuit for discharging.
The embodiment of the application also provides a battery, which comprises the battery cell structure.
It should be noted that the implementation manner of the above-mentioned cell structure embodiment is also applicable to the embodiment of the battery, and can achieve the same technical effect, and is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A cell structure, comprising: a first pole piece, a second pole piece, and a separator between the first and second pole pieces,
the first pole piece is provided with a first pole lug and a second pole lug, the first pole lug and the second pole lug are positioned on the same surface or the opposite surface of the first pole piece, and the second pole piece is provided with a third pole lug;
in the discharging process, the first lug, the second lug and the third lug are connected with a discharging circuit, or the first lug or the second lug and the third lug are connected with the discharging circuit;
in the charging process, the first lug or the second lug and the third lug are connected with a charging circuit.
2. The cell structure of claim 1, wherein the first pole piece comprises a first current collector, a first smear coated on a first surface of the first current collector, and a second smear coated on a second surface of the first current collector opposite to the first surface;
the second pole piece comprises a second current collector, a third smear and a fourth smear, the third smear is coated on the first surface of the second current collector, and the fourth smear is coated on the second surface of the second current collector opposite to the first surface.
3. The cell structure of claim 2, wherein the surface of the first smear is provided with a first groove and a second groove, wherein,
the first tab is located in the first groove, and the second tab is located in the second groove.
4. The cell structure of claim 2, wherein the surface of the first smear is provided with a third groove, wherein,
the first smear is coated on a first area of the first surface of the first current collector, and a second area of the first surface of the first current collector is adjacent to the first area;
the first tab is located in a second area of the first surface of the first current collector, and the second tab is located in the third groove.
5. The cell structure of claim 2, wherein the first smear is coated on a first area of the first surface of the first current collector, a second area of the first surface of the first current collector is adjacent to the first area, and a third area of the first surface of the first current collector is located on a side of the first area of the first surface of the first current collector away from the second area of the first surface of the first current collector;
the first tab is located in a second area of the first surface of the first current collector, and the second tab is located in a third area of the first surface of the first current collector.
6. The cell structure of claim 2, wherein the surface of the first smear is provided with a fourth groove and the surface of the second smear is provided with a fifth groove, wherein,
the first tab is positioned in the fourth groove; the second pole lug is positioned in the fifth groove.
7. The cell structure of claim 2, wherein the surface of the first smear is provided with a sixth groove, wherein,
the second smear is coated on a first area of the second surface of the first current collector, the second area of the second surface of the first current collector being adjacent to the first area of the second surface;
the first tab is located in the sixth groove, and the second tab is located in a second area of the second surface of the first current collector.
8. The cell structure of claim 2, wherein the first smear is applied to a first area of the first surface of the first current collector, the first tab is located at a second area of the first surface of the first current collector, and the first area of the first surface of the first current collector is adjacent to the second area;
the second smear is applied to a first area of the second surface of the first current collector, the second tab is located in a second area of the second surface of the first current collector, and the second area of the second surface of the first current collector is adjacent to the first area of the second surface of the first current collector.
9. The cell structure of claim 2 wherein the surface of the third smear is provided with a seventh groove, and the third tab is located in the seventh groove.
10. The cell structure of claim 2, wherein the third smear is coated on a first area of the first surface of the second current collector, the first area of the first surface of the second current collector being adjacent to a second area, the third smear being located on the second area of the first surface of the second current collector.
11. A battery comprising the cell structure of any of claims 1-10.
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| CN113782811A (en) * | 2021-09-13 | 2021-12-10 | 宁德新能源科技有限公司 | Electric equipment and method for heating electrochemical device |
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| CN116742106A (en) * | 2022-10-11 | 2023-09-12 | 荣耀终端有限公司 | Battery module, charging control method and electronic equipment |
| CN116742106B (en) * | 2022-10-11 | 2024-05-17 | 荣耀终端有限公司 | Battery module, charging control method and electronic equipment |
| CN116682931A (en) * | 2023-05-31 | 2023-09-01 | 江苏中兴派能电池有限公司 | Battery pole piece and long-cycle lithium battery |
| CN116682931B (en) * | 2023-05-31 | 2024-03-19 | 江苏中兴派能电池有限公司 | Battery pole piece and long-cycle lithium battery |
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