CN111490298A - Laminated soft package battery - Google Patents
Laminated soft package battery Download PDFInfo
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- CN111490298A CN111490298A CN202010328845.9A CN202010328845A CN111490298A CN 111490298 A CN111490298 A CN 111490298A CN 202010328845 A CN202010328845 A CN 202010328845A CN 111490298 A CN111490298 A CN 111490298A
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
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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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- 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
Abstract
The invention relates to a laminated soft package battery. According to the invention, the positive pole piece and the negative pole piece are stacked in a staggered size, the distance A between the first edge of the positive pole piece and the first edge of the negative pole piece is controlled to be larger than the distance B between the second edge of the positive pole piece and the second edge of the negative pole piece, and particularly, parameters such as 0.5-1.5 mm of A-B, the size of a diaphragm and the size of a soft package square battery are selected for the active material layer in the negative pole piece to cover the active material layer in the positive pole piece, the laminated soft package square battery and the like are selected, so that the diaphragm in the battery cell can more effectively cover the positive pole piece, the negative pole and the pole lug, the diaphragm has certain shrinkage after Tab welding or baking, the risk of short circuit between the pole lug and the edge of the corresponding pole piece can be more effectively reduced, the risk of short circuit.
Description
Technical Field
The invention belongs to the field of soft package batteries, and particularly relates to a laminated soft package battery.
Background
Due to energy shortage and environmental pollution, electric vehicles have been rapidly and rapidly developed in the last two decades. In recent years, under the background of vigorous development of new energy automobiles in our country, particularly after 2014, the development of the new energy automobile industry is not in good position.
However, with the increase of the number of commercialized applications of electric vehicles, spontaneous combustion and fire and explosion events of lithium ion power batteries for electric vehicles occur frequently, and at present, the development of the electric vehicle industry is a key opportunity, and any safety accident of electric vehicles not only has a great influence on manufacturing enterprises concerned, but also is a heavy strike on the whole industry, so that the improvement of the safety of power batteries is a key problem that the whole industry and each manufacturing enterprise need to pay attention to the improvement.
The conventional design of the lamination in the prior art is that ① conventional soft-package lamination positive and negative electrodes are stacked in a mode of being staggered from top to bottom (with the same side electrode tabs facing upwards), the current concentration density of the positive and negative electrode tabs in the charging and discharging processes is high, the negative electrode Tab area generates heat seriously compared with other areas of a cell body, the diaphragm shrinks to a certain extent after the batteries are repeatedly charged and discharged for a large multiplying power, the foil of the positive electrode tabs has the potential safety hazard of instant internal short circuit combustion caused by touching the edge of the negative electrode tabs, ② the conventional design is that the width of the Tab dressing is 0.5-2 mm after the positive and negative electrode tabs are punched, if the width of the Tab dressing is larger than that of the negative electrode dressing after the lamination stacking, lithium ions in the area near the Tab dressing are easily accumulated to form lithium dendrites in the repeated charging and discharging processes, the risk of short circuit combustion inside the cell caused by puncturing the diaphragm is solved, when the cell is subjected to ultrasonic welding, the energy is high, the temperature after continuous welding is high, the battery has certain heat impact on the Tab dressing near the Tab, the diaphragm shrinks to reduce the risk that the positive electrode tabs and the positive electrode tabs can be punctured effectively wrapped, the Tab foil is not subjected to short circuit, the mechanical arm b after the Tab is punctured by a certain heat impact, the Tab foil is not subjected to be punctured outside of a certain short circuit, and the Tab, the Tab foil is not subjected to the short circuit, and the mechanical arm, and the Tab after.
CN204407427U discloses a soft package lithium ion battery with power energy storage. The soft packet of lithium ion battery of power energy storage includes electric core and utmost point ear, and electric core is formed by positive plate and negative pole piece stack, and the positive plate includes the positive pole active material on aluminium foil and the coating aluminium foil, and the negative pole piece includes the negative pole active material on copper foil and the coating copper foil, and the width of aluminium foil is reserved for the twice of negative pole piece top reservation copper foil width on positive plate top, welds an anodal utmost point ear on the positive plate after the stack, and the first half negative pole piece and the latter half negative pole piece of electric core respectively weld a negative pole utmost point ear, and anodal utmost point ear width is the twice of negative pole utmost point ear width. However, the lithium ion battery cannot solve the problem that the positive and negative pole pieces in the battery cell are easily dislocated due to stress, and further the short circuit risk between the pole lug and the first edge of the pole piece is increased.
CN106532105A discloses an inner-string soft package lithium ion battery and a preparation method thereof. The inner string soft package lithium ion battery mainly comprises an upper aluminum plastic shell, a lower aluminum plastic shell, a middle aluminum plastic film layer, an upper battery cell and a lower battery cell. The upper layer and the lower layer of the battery cells are winding battery cells or lamination battery cells, the positions of positive and negative electrode lugs of the two battery cells are opposite, the lower layer of the battery cells are placed in the lower layer of the aluminum plastic shell, a layer of PP/Al/PP aluminum plastic film is covered, the upper layer of the battery cells and the upper layer of the aluminum plastic shell are stacked, packaging is carried out in sequence, the positive and negative electrodes of the upper and lower battery cells are welded, baking, liquid injection, formation, liquid pumping and forming are carried out. But the safety performance of the lithium ion battery is poor.
Therefore, there is a need in the art to develop a lamination structure of a battery with higher safety, and the lamination structure can effectively reduce the risk of short circuit inside the battery cell and improve the safety performance of the battery cell.
Disclosure of Invention
The stacking method aims at solving the problems that the short circuit combustion inside the battery cell is easily caused and the safety performance of the battery cell is poor in the conventional stacking mode of the soft-package laminated positive and negative electrodes in the prior art. The invention aims to provide a laminated soft package battery. The lamination mode of the soft package battery can effectively reduce the internal short circuit risk of the battery cell and improve the safety performance of the battery cell.
In order to achieve the purpose, the invention adopts the following technical scheme:
one of the purposes of the invention is to provide a laminated soft package battery, which comprises a positive pole piece, a negative pole piece and a diaphragm, wherein the size of the negative pole piece is larger than that of the positive pole piece; the positive electrode tab and the negative electrode tab in the laminated soft package battery are arranged on the same side of the laminated soft package battery; one side of the positive pole piece, which is connected with the lug, is a first edge of the positive pole piece, and the opposite side of the positive pole piece is a second edge of the positive pole piece; one side of the negative pole piece connected with the pole lug is a first edge of the negative pole piece, and the opposite side of the negative pole piece is a second edge of the negative pole piece; wherein, the distance between the first edge of the positive pole piece and the first edge of the negative pole piece is A, the distance between the second edge of the positive pole piece and the second edge of the negative pole piece is B, A > B, and 0.5mm < B <3mm, such as 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm or 2.8 mm.
According to the invention, the positive pole piece and the negative pole piece are stacked in a staggered size, and A is controlled to be larger than B, so that the positive pole piece and the positive and negative pole lugs can be effectively coated by the diaphragm in the battery cell, the risk that the pole lugs are in short circuit with the edges of the corresponding pole pieces can be effectively reduced due to certain shrinkage of the diaphragm after Tab welding or baking, and the risk that lithium dendrites near the pole lugs are in short circuit with the positive and negative poles can also be reduced.
The first edge of the invention can be the upper edge of the pole piece, and the corresponding second edge can be the lower edge of the pole piece. The joint of the positive pole lug and the positive pole piece and the joint of the negative pole lug and the negative pole piece of the invention must meet the requirement of A > B.
When the battery is applied to the battery in the prior art, the range of the first edge distance and the second edge distance is approximately 0.5-3 mm, the range of the first edge distance and the second edge distance can be 0.5-2 mm for a 3C small battery, and the range of the first edge distance and the second edge distance can be 1-3 mm for a power battery.
Thus, when the laminated pouch battery of the present invention is applied in a 3C product, 0.5mm < B <2 mm; when the laminated battery of the invention is applied to a power battery, 1mm < B <3 mm.
Preferably, A-B is more than or equal to 0.5 mm.
Preferably, a-B is 0.5 to 1.5mm (e.g., 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, or 1.4mm, etc.), and satisfies 50% > (a-B)/a > 30%, e.g., 32%, 34%, 35%, 36%, 38%, 40%, 42%, 45%, or 48%.
If A-B is too small, the effect of preventing short circuit is not obvious, and if A-B is too large, the phenomenon that the size of a lug embedded into a pole piece is too short can cause the fixation of the lug to be infirm, and the stability of the battery is influenced.
Preferably, the size of the active material layer of the negative electrode plate is larger than that of the positive electrode plate.
Preferably, the active material layer in the negative electrode plate covers the active material layer in the positive electrode plate.
If the width of the dressing of the positive pole piece is larger than that of the dressing of the negative pole piece after the pole piece lamination is stacked, lithium ions are easy to stack in the area near the dressing of the positive pole ear to form lithium dendrite in the repeated charging and discharging process of the battery cell, and the risk of short circuit combustion in the battery cell caused by membrane piercing is caused, so that the active material layer in the negative pole piece is selected to completely cover the active material layer in the positive pole piece.
Preferably, in the laminated soft package battery, the lamination mode of the battery cell is as follows: and repeatedly and sequentially stacking the negative pole piece, the diaphragm and the positive pole piece to obtain the battery core.
The stacking mode of the battery cell is as follows: placing a negative pole piece with a specified specification and size, sequentially stacking a layer of diaphragm with a specified size, stacking a positive pole piece, and repeatedly stacking the negative pole piece → the diaphragm → the positive pole to the specified layer number, wherein the lowest layer is the negative pole piece.
The selection of the thickness, the number of stacked layers and the anode and cathode active materials of the battery core is not particularly limited, and the selection can be performed by a person skilled in the art according to actual needs.
Preferably, the positive electrode tab is connected to the positive electrode plate on the uppermost layer in the laminated soft package battery, and the negative electrode tab is connected to the negative electrode plate on the lowermost layer in the laminated soft package battery.
The invention takes a negative pole piece, a diaphragm and a positive pole piece which are sequentially placed on a soft package battery shell (namely an aluminum plastic film) as a group of pole pieces, wherein the negative pole piece at the lowest layer is as follows: putting the negative pole piece (the first group) on the soft package battery shell for the first time; the anode pole piece on the uppermost layer is as follows: and (3) placing the positive pole piece (in the last group) on the soft-package battery shell for the last time.
In each group of pole pieces, the position relation of the negative pole piece, the diaphragm and the positive pole piece meets the requirements of the invention.
Preferably, the size of the separator is larger than that of the positive electrode plate, and the separator covers the positive electrode plate.
Preferably, the size of the separator is < the size of the negative electrode sheet, and the negative electrode sheet covers the separator.
Preferably, the laminated pouch battery is a pouch square battery.
The preparation method of the laminated soft package battery comprises the following steps:
(1) repeatedly and sequentially stacking a negative pole piece, a diaphragm and a positive pole piece, and controlling a first edge distance of the positive pole piece and the negative pole piece to be A, a second edge distance of the positive pole piece and the negative pole piece to be B, wherein A is greater than B, so as to obtain a battery cell;
(2) and placing the battery cell in an aluminum plastic film after pit punching, connecting a tab and packaging, and injecting electrolyte to obtain the laminated soft package battery.
As a preferred technical scheme, the preparation method of the laminated type soft package battery comprises the following steps:
(1) stacking a negative pole piece, a diaphragm and a positive pole piece repeatedly and sequentially, wherein the diaphragm covers the positive pole piece, the negative pole piece covers the diaphragm, the first edge distance of the positive pole piece and the negative pole piece is controlled to be A, the second edge distance of the positive pole piece and the negative pole piece is controlled to be B, A-B is 0.5-1.5 mm, 50% > (A-B)/A is more than or equal to 30%, and an active material layer in the negative pole piece covers an active material layer in the positive pole piece to obtain a battery cell;
(2) the obtained battery core is put into a soft package shell, and a positive electrode tab is connected to the uppermost positive electrode piece in the laminated soft package battery, and a negative electrode tab is connected to the lowermost negative electrode piece in the laminated soft package battery;
(3) and (3) locally heat-sealing the soft package shell, reserving a liquid filling port and a liquid outlet, continuously filling liquid into the soft package shell through an electrolyte filling device, replacing all internal air, and packaging the soft package shell in a heat sealing mode.
Compared with the prior art, the invention has the following beneficial effects:
the invention carries out structural design aiming at a soft-package laminated battery cell with lugs on the same side, the positive pole piece and the negative pole piece are stacked in a staggered size, the numerical value between A and B is controlled, and particularly, the parameters that A-B is 0.5-1.5 mm, the active material layer in the negative pole piece covers the active material layer in the positive pole piece, the size of a diaphragm, the laminated soft-package battery is a soft-package square battery and the like are selected, so that the diaphragm in the battery cell more effectively covers the positive pole piece, the negative pole and the lugs, the diaphragm has certain shrinkage after Tab welding or baking, the risk of short circuit between the lugs and the edges of the corresponding pole pieces can be more effectively reduced, the risk of short circuit between the lugs and the positive and negative poles of lithium dendrites near the lugs.
Drawings
Fig. 1 is a schematic structural diagram of a positive electrode plate and a negative electrode plate in a laminated soft package battery provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a positive pole piece and a negative pole piece in a laminated soft package battery provided by a comparative example of the invention.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The schematic structural diagram of the positive pole piece and the negative pole piece in the laminated soft package battery in the embodiment of the invention is shown in fig. 1, wherein 1-negative pole tab, 2-positive pole tab, 3-negative pole piece, 4-positive pole piece, the negative pole tab 1 is connected to the negative pole piece 3, the positive pole tab 2 is connected to the positive pole piece 4, a is a first edge distance between the positive pole piece and the negative pole piece, and B is a second edge distance between the positive pole piece and the negative pole piece;
wherein A is 1.7mm, B is 1 mm;
the laminated soft package battery in the embodiment of the invention is prepared by adopting the following method:
(1) stacking a negative pole piece, a diaphragm and a positive pole piece repeatedly and sequentially, wherein the diaphragm covers the positive pole piece, the negative pole piece covers the diaphragm, the first edge distance of the positive pole piece and the negative pole piece is controlled to be A, the second edge distance of the positive pole piece and the negative pole piece is controlled to be B, and an active material layer in the negative pole piece covers an active material layer in the positive pole piece to obtain a battery cell;
(2) the obtained battery core is put into a soft package shell, and a positive electrode tab is connected to the uppermost positive electrode piece in the laminated soft package battery, and a negative electrode tab is connected to the lowermost negative electrode piece in the laminated soft package battery;
(3) and (3) locally heat-sealing the soft package shell, reserving a liquid filling port and a liquid outlet, continuously filling liquid into the soft package shell through an electrolyte filling device, replacing all internal air, and packaging the soft package shell in a heat sealing mode.
The lithium ion battery of the present invention does not require any particular material selection, and the negative electrode may be a lithium foil or may be composed of a current collector and a negative electrode active material.
In an embodiment of the present invention, the lithium foil may be lithium metal or a lithium alloy.
In an embodiment of the present invention, the lithium alloy may be one of an aluminum lithium alloy, a lithium tin alloy, a lithium lead alloy, and a lithium silicon alloy.
As an alternative to the negative electrode, the current collector and the negative electrode active material may be a conventional negative electrode in the prior art; the current collector may be a copper foil, and the negative electrode active material may be one of graphite and silicon.
In an embodiment of the present invention, the negative active material may form an active material layer by combining with a binder, which may be one or more of polytetrafluoroethylene, styrene butadiene rubber, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, hydroxyethylcellulose, and polyvinyl alcohol; the amount of the binder may be in the conventional amount thereof; the binder may be used in an amount of 2 to 50% by weight with respect to 100 parts by weight of the anode active material.
The positive electrode of the battery according to the present invention includes a positive electrode current collector and a positive electrode active material.
In the embodiment of the present invention, the selection of the positive electrode current collector is not particularly limited, and as a preferable embodiment, the positive electrode current collector is an aluminum foil.
In the embodiment of the present invention, the selection of the positive electrode active material is not particularly limited, and as a preferable embodiment, the positive electrode active material is L iCoO2、LiMnO2、LiNiO2、LiVO2、LiNi1/3Co1/3Mn1/3O2、LiMn2O4、Li4Ti5O12、Li(Ni0.5Mn1.5)O4、LiFePO4、LiMnPO4、LiNiPO4、LiCoPO4One or more of them.
The battery according to the present invention can be applied to a nonaqueous electrolyte system lithium battery, and preferably, the nonaqueous electrolyte includes a lithium salt and a nonaqueous solvent, and the battery further includes a separator between the positive electrode and the negative electrode.
Preferably, the non-aqueous solvent is one or more of Ethylene Carbonate (EC), Propylene Carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC), ethyl carbonate, butylene carbonate, γ -butyrolactone, sulfolane, acetonitrile, 1, 2-dimethoxyethane, 1, 3-dimethoxypropane, diethyl ether, tetrahydrofuran, and 2-methyltetrahydrofuran.
Preferably, the lithium salt is L iPF6、LiBF4、LiClO4、LiAsF6、LiCF3SO3、LiN(CF3SO2)2One or more of them.
In a particularly preferred embodiment, the nonaqueous electrolyte solution may further include various other additives, such as a flame retardant additive, an overcharge protection additive, and the like, which are common knowledge in the art and will not be described herein.
In the embodiment of the present invention, the separator is disposed between the positive electrode and the negative electrode, and has an electrical insulating property and a liquid retaining property. The separator may be selected from various separators used in lithium ion batteries, such as one or more of polyolefin microporous membrane, polypropylene, polyethylene felt, glass fiber felt or ultrafine glass fiber paper. Such membranes are well known to those skilled in the art.
In an embodiment of the invention, the preparation of the non-aqueous electrolyte system lithium battery comprises the steps of preparing a positive electrode, a negative electrode and an electrolyte of the battery, winding and separating the positive electrode and the negative electrode through a diaphragm to form an electrode group, placing the electrode group into a battery case, adding the electrolyte, and then sealing the battery case, wherein the negative electrode is the negative electrode provided by the invention.
The battery according to the present invention can be applied to a solid electrolyte system, and the solid electrolyte material may be a crystalline material or an amorphous material. The solid electrolyte material may be glass or crystallized glass (glass ceramic). Examples of the shape of the solid electrolyte material include a particulate shape.
Preferably, the solid electrolyte is one of an oxide solid electrolyte, a sulfide solid electrolyte and a polymer solid electrolyte.
In the embodiment of the present invention, the oxide solid electrolyte is an oxide solid electrolyte, and specifically, L iPON (lithium oxynitride phosphate) and L i are exemplified1.3Al0.3Ti0.7(PO4)3、La0.51Li0.34TiO0.74、Li3PO4、Li2SiO2、Li2SiO4And the like.
The polymer electrolyte used in the present invention generally contains a metal salt and a polymer. In the case where the metal battery according to the present invention is a lithium battery, a lithium salt may be used as the metal salt. As the lithium salt, at least any one of the above inorganic lithium salt and organic lithium salt may be used. The polymer is not particularly limited as long as it forms a complex with a lithium salt, and examples thereof include polyethylene oxide and the like.
In the embodiment of the present invention, L i is exemplified as the sulfide solid electrolyte2S－P2S5、Li2S－P2S5－LiI、Li2S－P2S5－Li2O、Li2S－P2S5－Li2O－LiI、Li2S－SiS2、Li2S－SiS2－LiI、Li2S－SiS2－LiBr、Li2S－SiS2－LiCl、Li2S－SiS2－B2S3－LiI、Li2S－SiS2－P2S5－LiI、Li2S－B2S3、Li2S－P2S5－ZmSn(wherein m and n are positive numbers; Z is any one of Ge, Zn and Ga), L i2S－GeS2、Li2S－SiS2－Li3PO4、Li2S－SiS2－LixMOy(wherein x and y are positive numbers; M is any one of P, Si, Ge, B, Al, Ga and In.) the above-mentioned "L i2S－P2S5The term "includes L i2S and P2S5The same applies to the sulfide solid electrolyte material obtained from the raw material composition of (1).
The lithium halide includes, for example, L iF, L iCl, L iBr and L iI, and among them, L iCl, L iBr and L iI., the proportion of L iX (X ═ F, I, Cl and Br) in the sulfide solid electrolyte material is preferably in the range of, for example, 5 mol% to 30 mol%, and may be in the range of 15 mol% to 25 mol%.
Examples of the solid electrolyte used in the present invention include L i in addition to the above-mentioned ones2Ti(PO4)3-AlPO4(Ohara glass) and the like.
The structural schematic diagram of the positive pole piece and the negative pole piece in the laminated soft package battery of the invention is shown in fig. 2, wherein 11-negative pole tab, 21-positive pole tab, 31-negative pole piece, 41-positive pole piece, the negative pole tab 11 is connected to the negative pole piece 31, the positive pole tab 21 is connected to the positive pole piece 41, a1 is the first edge distance between the positive pole piece and the negative pole piece, and B1 is the second edge distance between the positive pole piece and the negative pole piece; wherein A1-B1-1 mm.
Except that the first edge distance value is different, the batteries obtained in the embodiment are selected under the same condition (namely, the positive and negative electrode active materials, the electrolyte, the diaphragm and the like which are the same as those in the embodiment are adopted), and compared with the batteries obtained in the comparative example, the short circuit risk is lower, and the safety performance is higher.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The laminated soft package battery is characterized by comprising a positive pole piece, a negative pole piece and a diaphragm, wherein the size of the negative pole piece is larger than that of the positive pole piece; the positive electrode tab and the negative electrode tab in the laminated soft package battery are arranged on the same side of the laminated soft package battery; one side of the positive pole piece, which is connected with the lug, is a first edge of the positive pole piece, and the opposite side of the positive pole piece is a second edge of the positive pole piece; one side of the negative pole piece connected with the pole lug is a first edge of the negative pole piece, and the opposite side of the negative pole piece is a second edge of the negative pole piece;
the distance between the first edge of the positive pole piece and the first edge of the negative pole piece is A, the distance between the second edge of the positive pole piece and the second edge of the negative pole piece is B, and A is greater than B.
2. The laminated pouch battery of claim 1, wherein a-B is greater than or equal to 0.5mm, and 0.5mm < B <3 mm.
3. The laminated pouch battery according to claim 1 or 2, wherein A-B is 0.5-1.5 mm, and 50% > (A-B)/A is greater than or equal to 30%.
4. The laminated pouch cell of any of claims 1-3, wherein the active material layer size in the negative electrode sheet is greater than the active material layer size in the positive electrode sheet.
5. The laminated pouch cell of any of claims 1-4, wherein the active material layer of the negative electrode sheet overlaps the active material layer of the positive electrode sheet.
6. The laminated pouch battery according to any one of claims 1 to 5, wherein the lamination mode of the battery cell is as follows: and repeatedly and sequentially stacking the negative pole piece, the diaphragm and the positive pole piece to obtain the battery core.
7. The laminate pouch cell according to any one of claims 1 to 6, wherein the positive tab is connected to the uppermost positive tab of the laminate pouch cell and the negative tab is connected to the lowermost negative tab of the laminate pouch cell.
8. The laminated pouch battery according to any of claims 1-7, wherein the separator has a size > that of the positive electrode sheet and the separator covers the positive electrode sheet.
9. The laminated pouch battery according to any of claims 1-8, wherein the separator has a size < the size of the negative electrode sheet and the negative electrode sheet covers the separator.
10. The laminate pouch cell of any of claims 1-9, wherein the laminate pouch cell is a pouch prismatic cell.
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| CN202010328845.9A CN111490298A (en) | 2020-04-23 | 2020-04-23 | Laminated soft package battery |
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| CN202010328845.9A CN111490298A (en) | 2020-04-23 | 2020-04-23 | Laminated soft package battery |
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| CN113067038A (en) * | 2021-01-04 | 2021-07-02 | 苏州清陶新能源科技有限公司 | Battery pack, vehicle and energy storage device |
| CN113725496A (en) * | 2021-09-01 | 2021-11-30 | 骆驼集团新能源电池有限公司 | Ternary system start-stop lithium ion battery and preparation method thereof |
| CN114843576A (en) * | 2022-04-22 | 2022-08-02 | 上海兰钧新能源科技有限公司 | Battery core and battery |
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