CN113394372A - Battery core, preparation method thereof and battery - Google Patents

Battery core, preparation method thereof and battery Download PDF

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Publication number
CN113394372A
CN113394372A CN202110729085.7A CN202110729085A CN113394372A CN 113394372 A CN113394372 A CN 113394372A CN 202110729085 A CN202110729085 A CN 202110729085A CN 113394372 A CN113394372 A CN 113394372A
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China
Prior art keywords
electrode plate
shaped
battery
cell
electrode
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Pending
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CN202110729085.7A
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Chinese (zh)
Inventor
裴现一男
万远鑫
孔令涌
赵中可
孙言
江莹
张思敏
李洁凤
任望保
贺艳兵
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Shenzhen Dynanonic Co ltd
Shenzhen International Graduate School of Tsinghua University
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Shenzhen Dynanonic Co ltd
Shenzhen International Graduate School of Tsinghua University
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Application filed by Shenzhen Dynanonic Co ltd, Shenzhen International Graduate School of Tsinghua University filed Critical Shenzhen Dynanonic Co ltd
Priority to CN202110729085.7A priority Critical patent/CN113394372A/en
Publication of CN113394372A publication Critical patent/CN113394372A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a battery cell, a preparation method thereof and a battery. The battery cell comprises at least one pile battery cell unit which is arranged in a laminated mode; the pile cell unit comprises a first electrode plate, a second electrode plate and a diaphragm; the first electrode plate and the second electrode plate are both in U-shaped or V-shaped folding structures; one end of the first electrode plate is inserted into the U-shaped or V-shaped gap of the second electrode plate, and one end of the second electrode plate is inserted into the U-shaped or V-shaped gap of the first electrode plate; and the diaphragm is attached between the first electrode plate and the second electrode plate so as to isolate the first electrode plate from the second electrode plate. The battery contains the cell of the invention. The ohmic resistance of the battery cell is low, and the safety performance is high.

Description

Battery core, preparation method thereof and battery
Technical Field
The invention belongs to the field of batteries, and particularly relates to a battery cell, a preparation method of the battery cell and a battery.
Background
The battery is used as an energy storage device and mainly comprises the following parts: positive electrode, negative electrode, diaphragm, electrolyte. The positive electrode, the diaphragm and the negative electrode are sequentially stacked to form a sandwich structure so as to form the battery cell. Besides the respective materials and properties of the anode, the cathode, the diaphragm and the electrolyte play a crucial role in the electrochemical properties, safety and other properties of the battery such as battery cycle, the structure of the battery cell plays a crucial role in the electrochemical properties, safety and other properties.
Conventional batteries, such as secondary batteries, typically include cells in a laminated structure, such as a lithium sulfur battery in which the positive and negative electrode sheets must be cut into the desired shape prior to assembly, and the cells will then be formed in a positive/separator/negative laminate. Therefore, the current collectors of the positive plates and the negative plates are connected by only welding the lug parts, so that the ohmic resistance of the whole positive system or negative system is large, and the lug joint easily generates heat and heats in the charging and discharging process of the battery, thereby causing performance influence and potential safety hazard to the battery.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a battery cell and a preparation method thereof, which are used for solving the technical problems of high resistance and safety caused by the fact that the existing laminated battery cells are connected by welding through tabs.
Another object of the present invention is to provide a battery, which solves the technical problem of the prior battery that the electrochemical performance and safety are not ideal due to the prior laminated cell.
In order to achieve the above object, according to one aspect of the present invention, a battery cell is provided. The battery cell comprises at least one pile battery cell unit which is arranged in a laminated mode; the galvanic pile cell unit comprises a first electrode plate, a second electrode plate and a diaphragm; the first electrode plate and the second electrode plate are both in U-shaped or V-shaped folding structures;
one end of the first electrode plate is inserted into the U-shaped or V-shaped gap of the second electrode plate, and one end of the second electrode plate is inserted into the U-shaped or V-shaped gap of the first electrode plate;
and the diaphragm is attached between the first electrode plate and the second electrode plate so as to isolate the first electrode plate from the second electrode plate.
In another aspect of the invention, a method for preparing the battery cell of the invention is provided. The battery cell comprises the following steps:
obtaining a first electrode plate body, wherein the first electrode plate body comprises at least one electrode plate, and the electrode plate is subjected to U-shaped or V-shaped folding treatment to form the first electrode plate with at least one U-shaped or V-shaped folding structure;
obtaining a second electrode plate body, wherein the second electrode plate body comprises at least one electrode plate, and the electrode plate is subjected to U-shaped or V-shaped folding treatment to form the second electrode plate with at least one U-shaped or V-shaped folding structure;
a diaphragm is attached to the surface of at least two end parts of each of the first electrode plate and the second electrode plate;
according to the method, at least one pile cell unit is assembled by inserting one end of each group of first electrode plates into a U-shaped or V-shaped gap of each group of second electrode plates and inserting one end of each group of second electrode plates into the U-shaped or V-shaped gap of each group of first electrode plates;
and assembling at least one stack cell unit into a cell.
In still another aspect of the present invention, a battery is also provided. The battery comprises a battery cell, wherein the battery cell is the battery cell or the battery cell prepared by the preparation method of the battery cell.
Compared with the prior art, the invention has the following technical effects:
according to the cell, the first electrode plate and the second electrode plate in the cell stack cell unit contained in the cell are arranged into the folding structures, and the electrode plates of each folding structure are integrally connected through the current collector, so that the ohmic resistance of the two electrode plates is greatly reduced, and the safety performance is also improved. Through the arrangement of the first electrode plate and the second motor plate structure contained in each pile cell unit, the two electrode plates play a role in synergy, the ohmic resistance of the cell is effectively reduced, the cell has high safety performance, the defect of high resistance of the conventional laminated cell is effectively overcome, and the cell is suitable for large-capacity batteries.
According to the cell preparation method, the first electrode plate body and the second electrode plate body are directly folded according to the cell structure to form the first electrode plate and the second electrode plate with U-shaped or V-shaped folding structures respectively, and the first electrode plate and the second electrode plate are set to be a cell stack cell unit, so that the prepared cell has the characteristics of low ohmic resistance and high safety.
The battery cell provided by the invention is the battery cell provided by the invention, so that the battery provided by the invention has small internal resistance, excellent rate performance and high safety, and can be a large-capacity battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a cell unit of a stack included in a cell according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a cell structure formed by stacking more than two cell units of the cell stack shown in fig. 1;
FIG. 3 is a schematic view of a U-shaped or V-shaped folding structure formed by a U-shaped or V-shaped folding process of a first electrode sheet body; wherein, a is a structural schematic diagram of the first electrode plate body before U-shaped or V-shaped folding treatment, and b is a structural schematic diagram of the first electrode plate with a folding structure;
fig. 4 is a schematic structural diagram of a lithium sulfur pouch battery according to an embodiment of the invention.
Part number description in the figures:
1' -one section of the first electrode slice body; 1-a first electrode sheet; 11-one of the folds of the first electrode sheet; 12-another fold of the first electrode sheet; 13-a bent portion of the first electrode sheet; 14-tab of the first electrode sheet 1; 15-bending lines for U-shaped or V-shaped folding treatment of the electrode plates 1';
2-a second electrode sheet; 21-one of the folding parts of the second electrode sheet; 22-another fold of the second electrode sheet; 23-a bent part of the second electrode sheet;
3-a diaphragm.
Detailed Description
In order to make the objects, technical solutions and technical effects of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and the embodiments described below are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive step in connection with the embodiments of the present invention shall fall within the scope of protection of the present invention. Those whose specific conditions are not specified in the examples are carried out according to conventional conditions or conditions recommended by the manufacturer; the reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, the term "and/or" describing an association relationship of associated objects means that there may be three relationships, for example, a and/or B, may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the description of the present invention, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
In addition, unless the context clearly uses otherwise, an expression of a word in the singular is to be understood as including the plural of the word. The terms "comprises" or "comprising" are intended to specify the presence of stated features, quantities, steps, operations, elements, portions, or combinations thereof, but are not intended to preclude the presence or addition of one or more other features, quantities, steps, operations, elements, portions, or combinations thereof.
The following explanations of related names:
pile electric core unit: the electrode sheet is a composite structure in which a first electrode sheet 1, a second electrode sheet 2 and a separator 3 are stacked in a manner of stacking the first electrode sheet 1, the separator 3 and the second electrode sheet 2 in fig. 1.
Battery cell: refers to a structure formed by stacking a plurality of the cell units of the electric pile in fig. 1.
U-shaped or V-shaped folding structure: the method is characterized in that a section of the electrode sheet shown as a in figure 3 is subjected to U-shaped or V-shaped folding treatment to form a U-shaped or V-shaped structure shown as b in figure 3.
A hinge part: refers to the two end regions of the U-shaped or V-shaped hinge structure.
Bending part: refers to a bending area connecting two adjacent folding parts.
In one aspect, an embodiment of the present invention provides a battery cell. The structure of the battery cell of the embodiment of the invention is shown in fig. 1 to fig. 3, and the battery cell comprises at least one stack battery cell unit 01 which is arranged in a stacked manner, wherein the stack battery cell unit 01 comprises a first electrode plate 1, a second electrode plate 2 and a diaphragm 3; wherein the content of the first and second substances,
the first electrode sheet 1 has a structure as shown in fig. 1 and 3, and is a U-shaped or V-shaped folded structure. The U-shaped or V-shaped hinge structure includes a hinge 11 and a hinge 12 at both ends and a U-shaped or V-shaped bent portion 13 connecting the hinge 11 and the hinge 12, as shown in fig. 1, 2, and b of fig. 3. The folding part 11 and the folding part 12 respectively comprise two oppositely arranged folding pages, and the bending part 13 comprises a convex surface and a concave surface which are oppositely arranged. The first electrode plate 1 is arranged to be of a folding structure, which is equivalent to that two electrodes contained in the traditional disc-type battery cell are directly integrated into a whole, and the ohmic resistance of the first electrode plate is effectively reduced.
In the embodiment of the present invention, the gap enclosed by the bending portion 13 of the first electrode sheet 1 and the two folding portions 11 and 12 is one of the bending portions that need to sandwich the second electrode sheet 2, and therefore, in order to enable the bending portion 13 to better sandwich one of the bending portions of the second electrode sheet 2, it is preferable that the bending portion 13 has a U-shaped appearance relative to the V-shaped appearance.
The structure of the second electrode plate 2 is shown in fig. 1 and fig. 2, and is similar to the structure appearance of the first electrode plate 1, and the second electrode plate is in a U-shaped or V-shaped folded structure. The U-shaped or V-shaped hinge structure includes, as shown in fig. 1 and 2, a hinge portion 21 and a hinge portion 22 at both ends, and a U-shaped or V-shaped bent portion 23 connecting the hinge portion 21 and the hinge portion 22. The folding portions 21 and 22 respectively include two oppositely disposed folding pages, and the bending portions 23 include oppositely disposed convex and concave surfaces. The second electrode plate 2 is arranged to be of a folding structure, which is equivalent to that two electrodes contained in the traditional disc-type battery cell are directly integrated into a whole, and the ohmic resistance of the second electrode plate is effectively reduced.
In the embodiment of the present invention, the gap enclosed by the bent portion 23 of the second electrode sheet 2 and the two hinge portions 21 and 22 is one of the bent portions that need to be sandwiched between the first electrode sheet 1, and therefore, in order to enable the bent portion 23 to better sandwich one of the bent portions of the first electrode sheet 1, it is preferable that the bent portion 23 has a U-shaped appearance as compared with the V-shaped appearance.
Based on the above-mentioned structure of the first electrode sheet 1 and the second electrode sheet 2, as shown in fig. 1 and 2, one end of the first electrode sheet 1, that is, the folded part 12 is inserted into the U-shaped or V-shaped gap enclosed by the folded part 23 of the second electrode sheet 2 and the two folded parts 21 and 22. One end of the second electrode plate 2 is inserted into the U-shaped or V-shaped gap of the first electrode plate. And the first electrode plate 1 and the second electrode plate 2 are isolated by a diaphragm 3, so that a stack cell unit 01 is formed.
The diaphragm 3 is attached between the first electrode plate 1 and the second electrode plate 2 to realize the isolation of the first electrode plate 1 and the second electrode plate 2. Thus, the separator 3 is attached to at least the opposite end of the hinge 11 of the first electrode sheet 1 and the opposite end of the hinge 12, and to at least the opposite end of the hinge 21 of the second electrode sheet 2 and the opposite end of the hinge 22. Of course, the electrode sheet may be further bonded to the convex and concave surfaces of the bent portion 13 of the first electrode sheet 1, or may be further bonded to the convex and concave surfaces of the bent portion 23 of the second electrode sheet 2. In the embodiment of the present invention, it is desirable that the separator 3 is attached to both the opposite two folded pages of the folding portion 11 and the opposite two folded pages of the folding portion 12 of the first electrode sheet 1 and at least to both the opposite two folded pages of the folding portion 21 and the opposite two folded pages of the folding portion 22 of the second electrode sheet 2, and is attached to the convex surface and the concave surface of the folding portion 13 of the first electrode sheet 1 and to the convex surface and the concave surface of the folding portion 23 of the second electrode sheet 2, so as to improve the safety and electrochemical stability of the stack cell unit 01.
In a specific embodiment, the membrane 3 is a one-piece membrane and is attached to opposite surfaces of the first electrode sheet 1 and the second electrode sheet 2, specifically, as shown in fig. 1, the membrane 3 is attached between the folding portion 11 of the first electrode sheet 1 and the folding portion 21 of the second electrode sheet 2, the membrane 3 is attached between the folding portion 12 of the first electrode sheet 1 and the folding portion 22 of the second electrode sheet 2, and is also attached to the convex surface and the concave surface of the bending portion 13 of the first electrode sheet 1 and the convex surface and the concave surface of the bending portion 23 of the second electrode sheet 2. Therefore, the safety of the battery cell is effectively improved.
In the battery cell according to the embodiment of the present invention, the battery cell may only include one above-mentioned stack battery cell unit 01, and certainly, may include more than two above-mentioned stack battery cell units 01. In an embodiment, the cell may contain 1 to 200, further 1 to 100, and further 1 to 50 of the above-described stack cell units 01. In an embodiment, when the battery cell includes more than two stack cell units 01 as described above, the separator 3 is further attached between adjacent stack cell units 01 to isolate the adjacent stack cell units 01. In another embodiment, when a battery cell is assembled by using more than two stack cell units 01, the stack cell units 01 are sequentially stacked along an extending direction. In a specific embodiment, the number of the stack cell units 01 for assembling the cells may be controlled according to specific requirements.
Like this, in pile electric core unit 01, first electrode piece 1 and second electrode piece 2 set up to fold paper structure, and both peg graft and fold and establish, carry out whole continuous through the mass flow body in each structure electrode piece of folding paper to very big reduction the ohmic resistance of two electrode pieces, also improved the security performance moreover. Through the setting of containing first electrode piece 1 and second motor piece 2 structure to each pile electric core unit 01 for the bipole piece plays synergistic effect, effectively reduces the ohmic resistance of electric core, gives the high security performance of electric core, has effectively overcome the defect of the high resistance that current lamination formula electric core exists, makes electric core be applicable to large capacity battery.
Based on the structure of the stack cell unit 01 in each of the above embodiments, as an embodiment of the present invention, one of the first electrode tab 1 and the second electrode tab 2 is a positive electrode tab, and the other electrode tab is a negative electrode tab. In a specific embodiment, the first electrode tab 1 is a positive electrode tab, and the second electrode tab 2 is a negative electrode tab.
In an embodiment, when one of the electrode sheets in the stack cell unit 01, for example, the first electrode sheet 1, is a positive electrode sheet, in a specific embodiment, the positive electrode sheet is a positive electrode sheet of a lithium sulfur battery, and the positive electrode sheet of the lithium sulfur battery includes a current collector and a positive electrode material layer containing an active sulfur material and a conductive material, which is formed on a surface of the current collector. When another electrode tab, such as the second electrode tab 2, in the stack cell unit 01 is a negative electrode tab, in a specific embodiment, the negative electrode tab is a lithium metal tab. Wherein, the lithium metal sheet comprises lithium metal foil or lithium metal alloy foil and the like. At this time, the stack cell unit is a lithium sulfur battery cell unit, and then the cell constitutes a lithium sulfur battery cell.
Of course, the first electrode sheet 1 and the second electrode sheet 2 in the above embodiments are respectively provided with tabs, and in a specific embodiment, the tab included in the first electrode sheet 1 is, for example, the tab 14 in a diagram a in fig. 3, and the tab included in the second electrode sheet 2 may be the same as or similar to the tab in a diagram a in fig. 3.
Therefore, each of the above embodiments of the battery cell is provided with the first electrode plate 1 and the second motor plate 2 contained in each stack battery cell unit 01, so that the two electrode plates have a synergistic effect, the ohmic resistance of the battery cell is effectively reduced, the battery cell has high safety performance, the defect of high resistance existing in the existing laminated battery cell is effectively overcome, and the battery cell is suitable for a large-capacity battery.
Correspondingly, the embodiment of the invention also provides a preparation method of the battery cell. The preparation method of the battery cell comprises the following steps:
s01: obtaining a first electrode plate body, wherein the first electrode plate body comprises at least one electrode plate, and the electrode plate is subjected to U-shaped or V-shaped folding treatment to form the first electrode plate with at least one U-shaped or V-shaped folding structure;
s02: obtaining a second electrode plate body, wherein the second electrode plate body comprises at least one electrode plate, and the electrode plate is subjected to U-shaped or V-shaped folding treatment to form the second electrode plate with at least one U-shaped or V-shaped folding structure;
s03: a diaphragm is attached to the surface of at least two end parts of each of the first electrode plate and the second electrode plate;
s04: according to the method, at least one pile cell unit is assembled by inserting one end of each group of first electrode plates into a U-shaped or V-shaped gap of each group of second electrode plates and inserting one end of each group of second electrode plates into the U-shaped or V-shaped gap of each group of first electrode plates;
s05: and assembling at least one stack cell unit into a cell.
The first electrode sheet body in step S01 is a pole piece forming the first electrode sheet 1 in fig. 1. Each electrode sheet is subjected to U-shaped or V-shaped folding processing as shown in a figure 3, and one electrode sheet 1' is subjected to U-shaped or V-shaped folding processing according to a bending line 15 to form a U-shaped or V-shaped folding structure as shown in a figure 3 b. In addition, the first electrode sheet body is the electrode sheet body of the first electrode sheet 1 as described in the above electric cell. When the first electrode plate 1 is a positive electrode plate, such as a positive electrode plate of a lithium-sulfur battery, the electrode plate 1' is a positive electrode plate of the lithium-sulfur battery; when the first electrode sheet 1 is a negative electrode sheet, specifically, a lithium metal sheet, the electrode sheet 1' is a lithium metal sheet.
The second electrode sheet body is subjected to the U-shaped or V-shaped folding process in step S02 referring to the first electrode sheet body which is subjected to the U-shaped or V-shaped folding process in step S01. The U-shaped or V-shaped folded structure of the second electrode sheet is formed to be the same as or similar to the U-shaped or V-shaped folded structure of the first electrode sheet.
In addition, step S01 and step S02, and step S01 and step S03 are not in sequence.
The diaphragm in step S03 is the diaphragm 3 included in the stack cell unit 01 of the cell according to the embodiment of the present invention, where the position where the diaphragm is attached to the first electrode sheet and the second electrode sheet is the same as the position where the diaphragm 3 included in the cell is attached to the stack cell unit 01.
In step S04, the method for inserting the first electrode sheet into the second electrode sheet specifically inserts the first electrode sheet 1 and the second electrode sheet 2 included in the above-described battery cell and the above-described stack battery cell unit 01 shown in fig. 1, so as to form the above-described stack battery cell unit 01.
The cell stack cell unit in the step S05 may be assembled into a cell according to a conventional method. In the embodiment, when a cell is assembled by using two or more stack cell units 01, adjacent stack cell units 01 are separated by a diaphragm 3. In an embodiment, when the battery cell is assembled by using more than two stack cell units 01, the stack cell units 01 are sequentially stacked along an extending direction. In a specific embodiment, the number of the stack cell units 01 for assembling the cells may be controlled according to specific requirements.
In this way, according to the cell preparation method of the embodiment of the invention, the first electrode plate body and the second electrode plate body are directly folded according to the cell structure of the embodiment of the invention, so that the first electrode plate and the second electrode plate with the U-shaped or V-shaped folding structure are respectively formed, and are set as the cell unit of the cell stack, so that the prepared cell has the characteristics of low ohmic resistance and high safety, the process of the cell preparation method is easy to control, the quality and the performance of the prepared cell are stable, and the efficiency is high.
On the other hand, based on the battery cell and the preparation method thereof in the embodiment of the invention, the embodiment of the invention also provides a battery. The battery includes a cell, and of course, necessary components of the battery, such as a battery case for covering the cell, an electrolyte for reacting with the cell, and the like. The battery cell is the battery cell in the embodiment of the invention. The battery cell of the battery is the battery cell of the embodiment of the invention, so that the battery of the embodiment of the invention has small internal resistance, excellent rate performance and high safety, and can be a large-capacity battery.
In the embodiment, when the first electrode sheet 1 contained in the battery cell is a lithium foil, and the second electrode sheet 2 is a positive electrode, specifically a sulfur-containing battery positive electrode, the battery is a lithium-sulfur battery. When the lithium sulfur battery is a lithium sulfur pouch battery, the structure of the battery is shown in fig. 4. Of course, the battery of the embodiment of the present invention may also be other types of batteries, and as long as the battery includes the battery cell of the embodiment of the present invention, the battery is within the scope disclosed in the embodiment of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A battery cell, wherein the battery cell comprises at least one stack cell unit; the galvanic pile cell unit comprises a first electrode plate, a second electrode plate and a diaphragm; the first electrode plate and the second electrode plate are both in U-shaped or V-shaped folding structures;
one end of the first electrode plate is inserted into the U-shaped or V-shaped gap of the second electrode plate, and one end of the second electrode plate is inserted into the U-shaped or V-shaped gap of the first electrode plate;
and the diaphragm is attached between the first electrode plate and the second electrode plate so as to isolate the first electrode plate from the second electrode plate.
2. The cell of claim 1, wherein: the number of the electric pile cell units is 1-200.
3. The cell of claim 2, wherein the stack cell units are two or more, and:
the diaphragm is attached between the adjacent electric pile electric core units so as to isolate the adjacent electric pile electric core units; and/or the presence of a gas in the gas,
the electric pile cell units are sequentially stacked along an extending direction.
4. The electrical core of any of claims 1 to 3, wherein: the diaphragm is a whole diaphragm and is attached to two opposite surfaces of the first electrode plate and the second electrode plate; and/or
One of the first electrode plate and the second electrode plate is a positive electrode plate, and the other electrode plate is a negative electrode plate.
5. The cell of claim 4, wherein: the positive plate is a positive plate of the lithium-sulfur battery; the negative plate is a lithium metal plate.
6. A preparation method of a battery cell comprises the following steps:
obtaining a first electrode plate body, wherein the first electrode plate body comprises at least one electrode plate, and the electrode plate is subjected to U-shaped or V-shaped folding treatment to form the first electrode plate with at least one U-shaped or V-shaped folding structure;
obtaining a second electrode plate body, wherein the second electrode plate body comprises at least one electrode plate, and the electrode plate is subjected to U-shaped or V-shaped folding treatment to form the second electrode plate with at least one U-shaped or V-shaped folding structure;
a diaphragm is attached to the surface of at least two end parts of each of the first electrode plate and the second electrode plate;
according to the method, at least one pile cell unit is assembled by inserting one end of each group of first electrode plates into a U-shaped or V-shaped gap of each group of second electrode plates and inserting one end of each group of second electrode plates into the U-shaped or V-shaped gap of each group of first electrode plates;
and assembling at least one stack cell unit into a cell.
7. The method of claim 6, wherein: more than two electric pile electric core units are stacked, and an electric core is assembled between two adjacent electric pile electric core units in a diaphragm isolation mode.
8. A battery, includes electric core, its characterized in that: the battery cell is the battery cell of any one of claims 1 to 5 or the battery cell prepared by the preparation method of any one of claims 6 to 7.
9. The battery of claim 8, wherein: the battery is a lithium sulfur battery.
10. The battery of claim 9, wherein: the lithium-sulfur battery is a lithium-sulfur soft package battery.
CN202110729085.7A 2021-06-29 2021-06-29 Battery core, preparation method thereof and battery Pending CN113394372A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120082580A (en) * 2011-01-14 2012-07-24 주식회사 엘지화학 Stack and folding-typed electrode assembly having improved safety property and method for preparation of the same
CN107735896A (en) * 2015-06-23 2018-02-23 株式会社Lg化学 Electrode assemblie and its manufacture method for secondary cell
CN111354981A (en) * 2020-05-22 2020-06-30 北京小米移动软件有限公司 Battery cell structure, lithium battery and terminal equipment
CN215377442U (en) * 2021-06-29 2021-12-31 深圳市德方纳米科技股份有限公司 Battery core and battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120082580A (en) * 2011-01-14 2012-07-24 주식회사 엘지화학 Stack and folding-typed electrode assembly having improved safety property and method for preparation of the same
CN107735896A (en) * 2015-06-23 2018-02-23 株式会社Lg化学 Electrode assemblie and its manufacture method for secondary cell
CN111354981A (en) * 2020-05-22 2020-06-30 北京小米移动软件有限公司 Battery cell structure, lithium battery and terminal equipment
CN215377442U (en) * 2021-06-29 2021-12-31 深圳市德方纳米科技股份有限公司 Battery core and battery

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