CN210576277U - Lithium ion battery lamination electric core and lithium ion battery - Google Patents
Lithium ion battery lamination electric core and lithium ion battery Download PDFInfo
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- CN210576277U CN210576277U CN201921841125.1U CN201921841125U CN210576277U CN 210576277 U CN210576277 U CN 210576277U CN 201921841125 U CN201921841125 U CN 201921841125U CN 210576277 U CN210576277 U CN 210576277U
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- diaphragm
- pole piece
- lithium ion
- pole pieces
- ion battery
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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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The utility model relates to a lithium ion battery field discloses a lithium ion battery lamination electrical core and lithium ion battery. The electric core includes: the laminated unit comprises at least two laminated units, wherein the laminated units are mutually laminated, one of two adjacent pole pieces between any two adjacent laminated units is a positive pole piece, the other one of the two adjacent pole pieces is a negative pole piece, and the pole pieces positioned on two opposite outermost layers of the laminated units are both negative pole pieces; each lamination unit comprises: the diaphragm is arranged between every two adjacent pole pieces in a Z shape at intervals and covers the outer surface of the outermost pole piece of the lamination unit, one of the two adjacent pole pieces is a positive pole piece, the other one of the two adjacent pole pieces is a negative pole piece, and the adhesive layer on the surface of the diaphragm is fused under the action of hot pressing to be combined with the pole pieces on the surface of the adhesive layer. By applying the technical scheme, the lamination precision is favorably improved, the pole piece dislocation of the battery core is reduced, and the safety function of the battery is further improved.
Description
Technical Field
The utility model relates to a lithium ion battery preparation field discloses a lithium ion battery lamination electrical core and lithium ion battery.
Background
Along with the popularization of the global environmental protection concept, the new energy electric vehicle gradually enters the mass market, how to improve the endurance mileage of the new energy electric vehicle becomes an industrial technical problem, the lithium ion battery is used as a power energy source of the current new energy electric vehicle, and the largest abnormal problem of the lithium ion battery is low voltage and short circuit.
Disclosure of Invention
An object of the embodiment of the utility model is to provide a lithium ion battery lamination electrical core body uses this technical scheme, is favorable to improving the lamination precision, reduces the pole piece dislocation of electric core and takes place, and then improves battery safety function.
The utility model discloses a second purpose lies in providing a lithium ion battery, uses this technical scheme, is favorable to improving the lamination precision, reduces the pole piece dislocation of electric core and takes place, and then improves battery safety function.
In a first aspect, the embodiment of the utility model provides a pair of lithium ion battery lamination electrical core body, include:
the laminated unit comprises at least two laminated units, wherein the laminated units are mutually laminated, one of two adjacent pole pieces between any two adjacent laminated units is a positive pole piece, the other one of the two adjacent pole pieces is a negative pole piece, and the pole pieces positioned on two opposite outermost layers of the laminated units are negative pole pieces;
each lamination unit comprises: the diaphragm is in a Z shape, the interval is between each two adjacent pole pieces, the diaphragm covers the outer surface of the outermost pole piece of the lamination unit, one of the two adjacent pole pieces is a positive pole piece, the other is a negative pole piece, and the adhesive layer on the surface of the diaphragm is fused under the action of hot pressing and is combined with the pole pieces on the surface of the adhesive layer.
Optionally, the diaphragm is further covered outside at least one side surface of the lamination unit after being bent by 90 degrees along the length extension direction of the diaphragm from the outer surface of the pole piece on at least one outermost layer of the lamination unit,
on the side face, the adhesive layer on the surface of the diaphragm is fused under the action of hot pressing to be combined with the pole piece on the surface of the adhesive layer and the adhesive layer of the diaphragm.
Optionally, the diaphragm is sequentially bent at 90 degrees from the outer surfaces of the pole pieces at the two outermost layers of the lamination unit along the length extension direction of the diaphragm to cover the two side surfaces of the lamination unit,
on the two side surfaces, the glue layer on the surface of the diaphragm is fused under the action of hot pressing to be combined with the pole piece on the surface of the glue layer and the glue layer of the diaphragm.
Optionally, each lamination unit is provided with 2-10 pole pieces.
In a second aspect, the present embodiment provides a lithium ion battery, comprising,
a shell body made of an aluminum-plastic film,
the lithium ion battery lamination electric core body is sealed in the aluminum plastic film shell,
and the electrolyte is soaked in each pole piece and each diaphragm of the lithium ion battery laminated electric core body.
From top to bottom, adopt this embodiment lithium ion battery lamination electrical core body, have following beneficial effect:
1. in the embodiment, the lithium ion lamination body is divided into a plurality of lamination units, each lamination unit comprises about 2-20 pole pieces to form a thinner lamination unit, and the lamination units are hot-pressed, so that the thickness of the hot-pressed lamination units is reduced, and the displacement of the pole pieces in the hot-pressing process is avoided.
2. The colloid of the diaphragm in continuous strip shape is combined with each pole piece on the surface of the colloid, so that the displacement of the laminated body in the operation process can be avoided to cause the dislocation of the pole pieces, and further the problems of battery capacity attenuation, battery short circuit and the like caused by the dislocation of the pole pieces are avoided.
3. The diaphragm in the lamination unit of the embodiment is in a continuous belt shape, the diaphragm surrounds at least one side of each pole piece and the front surface and the back surface of each pole piece in a Z shape, and is combined with the pole pieces in contact with the diaphragm, the pole pieces are forbidden to move relative to the diaphragm, the technical scheme can effectively avoid the problem that burrs (if any) on the edges of the pole pieces pierce the diaphragm due to the displacement of the pole pieces, and further the problems of battery capacity attenuation and battery short circuit are caused, and the technical scheme is favorable for improving the application safety of the battery.
4. Because each layer of pole piece in each lamination unit is combined with the glue layer of the diaphragm, and in the lateral direction of the lamination unit, the colloid on the surface of the diaphragm surrounded by the Z shape is also combined with the pole piece on the surface of the colloid, and the upper part, the lower part, the left part and the right part of the lamination unit are coated by the combined diaphragm, thereby being beneficial to preventing dust from entering the interior of the lamination unit in the operation process of the lamination unit and reducing the dust.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a stacked unit provided in embodiment 1 of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a laminated electrical core composed of a plurality of laminated units according to embodiment 1 of the present invention.
Reference numerals:
1: a positive plate; 2: a negative plate; 3: a diaphragm.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
referring to the figures, the embodiment provides a novel laminated electric core of a lithium ion battery, which is mainly formed by stacking a plurality of laminated units in an up-down opposite manner, and the outermost layer of each laminated unit is 3 layers of diaphragms.
When the stacking units are stacked, the stacking units which are randomly stacked with each other are respectively marked as a first stacking unit and a second stacking unit, so that the polarity of the pole piece (the pole piece is also covered with the diaphragm 3) on the outermost layer of the side, facing the second stacking unit, of the first stacking unit is opposite to that of the pole piece (the pole piece is also covered with the diaphragm 3) on the second stacking unit, which is facing the first stacking unit, namely one pole piece is a positive pole piece 1, and the other pole piece is a negative pole piece 2. Therefore, in the lithium ion laminated sheet body formed by laminating a plurality of laminated sheet units, one of any two adjacent pole pieces is a positive pole piece 1, the other one is a negative pole piece 2, and a diaphragm 3 is arranged between any two adjacent pole pieces at intervals.
Each lamination unit is constructed such that each lamination unit includes a plurality of pole pieces, a continuous band-shaped diaphragm 3, respectively.
Wherein, the two surfaces of the diaphragm 3 are respectively coated with glue layers, the strip-shaped diaphragm 3 is arranged between each adjacent pole piece (one of the adjacent pole pieces is a positive pole piece 1, the other is a negative pole piece 2) in a Z-shaped interval and covers the outer surface of the outermost pole piece of the lamination unit, when the number of the laminations reaches a predetermined number (such as but not limited to 2-20), the lamination unit is arranged under a hot pressing device, the lamination unit is hot pressed by adopting a predetermined high temperature, the glue layers on the surfaces of the diaphragm 3 are melted under the action of the high temperature, the melted glue layers are connected with the pole pieces on the surfaces of the glue layers, after cooling, the glue body is solidified, each diaphragm 3 and the pole pieces on the surfaces of the diaphragm 3 are combined together through the glue layers, as can be seen from figure 1, the surfaces of each pole piece are respectively combined with the glue layers of the diaphragm 3 on the surfaces of the pole pieces in the lamination unit, one edge side direction of each pole piece is combined with the colloid of the diaphragm 3 which is wound outside the edge in a Z shape, the upper part, the lower part, the left part and the right part of the unit body are combined with the glue layer of the diaphragm 3 when viewed from the whole lamination unit, the diaphragm 3 is of a continuous strip-shaped structure, and the lamination unit is combined into a whole fixed by the diaphragm 3 to effectively avoid the displacement of the pole piece.
As an illustration of the present embodiment, the lamination unit of the present embodiment may be, but is not limited to, sequentially laminating the separator 3, the negative electrode sheet 2, the separator 3, the positive electrode sheet 1, the separator 3, the negative electrode sheet 2, the separator 3 …, the negative electrode sheet 2, and the separator 3 in this order, and the outermost layer of the lamination unit is the separator 3.
In each lamination unit, the area of each negative electrode sheet 2 is larger than that of each positive electrode sheet 1, and the area of each separator is larger than that of each negative electrode sheet 2.
In addition, in the hot pressing process, air holes can be further formed in the hot pressing equipment, when the hot pressing equipment presses the lamination unit, air in the lamination unit is pumped out through air hole vacuumizing, the phenomenon that air bubbles are formed in the lamination unit to influence the flatness of the lamination unit is avoided, and the improvement of the flatness of the lamination is facilitated. In addition, the air hole vacuumizing scheme can be used for adsorbing dust on the surface of the lamination unit, and the lamination quality is improved.
From top to bottom, adopt this embodiment lithium ion battery lamination electrical core body, have following beneficial effect:
1. in the embodiment, the lithium ion lamination body is divided into a plurality of lamination units, each lamination unit comprises about 2-20 pole pieces to form a thinner lamination unit, and the lamination units are hot-pressed, so that the thickness of the hot-pressed lamination units is reduced, and the displacement of the pole pieces in the hot-pressing process is avoided.
2. The colloid of the diaphragm 3 in a continuous strip shape is combined with each pole piece on the surface of the colloid, so that the displacement of the laminated body in the operation process can be avoided to cause the dislocation of the pole pieces, and further, the problems of battery capacity attenuation, battery short circuit and the like caused by the dislocation of the pole pieces are avoided.
3. The diaphragm 3 in the lamination unit of the embodiment is in a continuous belt shape, the diaphragm 3 surrounds at least one side of each pole piece and the front surface and the back surface of each pole piece in a Z shape, and is combined with the pole pieces in contact with the diaphragm 3, the movement of the pole pieces relative to the diaphragm 3 is forbidden, the technical scheme can effectively avoid the problem that burrs (if any) on the edges of the pole pieces pierce the diaphragm 3 due to the displacement of the pole pieces, and further the problems of battery capacity attenuation and battery short circuit are caused, and the application safety of the battery is favorably improved.
4. Because each layer of pole piece in each lamination unit is combined with the glue layer of the diaphragm 3, and in the lateral direction of the lamination unit, the colloid on the surface of the diaphragm 3 surrounded by the Z shape is also combined with the pole piece on the surface of the colloid, and the upper part, the lower part, the left part and the right part of the lamination unit are coated by the diaphragm 3 which is combined together, thereby being beneficial to preventing dust from entering the inside of the lamination unit in the operation process of the lamination unit and being beneficial to reducing the dust.
As an illustration of the present embodiment, in each lamination unit, the continuous strip-shaped diaphragm 3 is further bent by 90 degrees along the length extension direction of the diaphragm 3 after being wound to the outer surface (denoted as a first outer surface) of an outermost pole piece of the lamination unit so as to be wound to the side surface (denoted as a first side surface) of the lamination unit perpendicular to the first outer surface, and cover the first side surface, as seen from fig. 1, on the first side surface of the lamination unit, the edge of each pole piece on the first side surface is completely covered by the diaphragm 3, and the pole piece is laterally limited so as to avoid displacement in the side direction, which is beneficial to improving the lamination flatness of the lamination unit. When hot pressing, the glue film on the surface of the diaphragm 3 is heated and melted and is combined with the pole piece and the diaphragm 3 which are positioned on the glue layer side, the colloid is solidified after cooling, a stable combination structure is formed, the displacement is further avoided, and the diaphragm 3 is pierced by burrs at the edge of the pole piece caused by the displacement.
As an illustration of the present embodiment, after the continuous strip-shaped diaphragm 3 wraps the first side of the lamination unit, along the extending direction of the diaphragm 3, the continuous strip-shaped diaphragm is further bent by 90 degrees to wind around another outer surface (referred to as a second outer surface) of the lamination unit perpendicular to the first side, and then further bent by 90 degrees along the extending direction of the diaphragm 3 to wind around another side (referred to as a second side, which is opposite to the first side) of the lamination unit perpendicular to the second outer surface, the diaphragm 3 covers the second side and covers the side, the edges of the second side of each pole piece are all wrapped by the diaphragm 3, and the diaphragm 3 respectively wraps and limits the first side and the second side of the pole piece, so as to prevent the pole piece from laterally shifting, and further facilitate improving the lamination flatness of the lamination unit. During hot pressing, the glue layers on the surfaces of the second outer surface and the diaphragm 3 on the second side surface are heated and melted to be combined with the pole piece and the diaphragm 3 on the surfaces of the glue layers, and after cooling, the glue body is solidified to form a stable combination structure, so that displacement is further avoided, and burrs on the edge of the pole piece, caused by the displacement, pierce through the diaphragm 3.
The lithium ion battery is manufactured by using the lithium ion battery laminated electric core body of the embodiment, and the preparation process mainly comprises the following steps:
1. and respectively preparing each lamination unit, stacking each lamination unit with a preset number in an up-down opposite mode according to the current battery capacity requirement, and encapsulating when the lamination units are stacked to a preset thickness to obtain the lithium ion battery stacked body (also called a battery core) consisting of the lamination units. Further encapsulation processes can be, but are not limited to, see the prior art.
2. The laminated electric core body of the lithium ion battery is packaged in an aluminum-plastic film shell, and the prior art can be referred to in the aluminum-plastic film packaging technology.
3. And (3) pouring a certain amount of electrolyte into the aluminum-plastic film shell, and soaking the electrolyte into each pole piece and each diaphragm 3 of the laminated electric core body of the lithium ion battery, wherein the liquid injection process refers to the prior art.
4. And performing subsequent processes of packaging and vacuumizing the aluminum-plastic film, forming and grading, and the like to obtain the lithium ion battery.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (5)
1. The utility model provides a lithium ion battery lamination electric core, characterized by includes:
the laminated unit comprises at least two laminated units, wherein the laminated units are mutually laminated, one of two adjacent pole pieces between any two adjacent laminated units is a positive pole piece, the other one of the two adjacent pole pieces is a negative pole piece, and the pole pieces positioned on two opposite outermost layers of the laminated units are negative pole pieces;
each lamination unit comprises: the diaphragm is in a Z shape, the interval is between each two adjacent pole pieces, the diaphragm covers the outer surface of the outermost pole piece of the lamination unit, one of the two adjacent pole pieces is a positive pole piece, the other is a negative pole piece, and the adhesive layer on the surface of the diaphragm is fused under the action of hot pressing and is combined with the pole pieces on the surface of the adhesive layer.
2. The laminated electrical core of a lithium ion battery of claim 1,
the diaphragm is further covered outside at least one side surface of the lamination unit after being bent by 90 degrees along the length extension direction of the diaphragm from the outer surface of the pole piece on at least one outermost layer of the lamination unit,
on the side face, the adhesive layer on the surface of the diaphragm is fused under the action of hot pressing to be combined with the pole piece on the surface of the adhesive layer and the adhesive layer of the diaphragm.
3. The laminated electrical core of a lithium ion battery of claim 2,
the diaphragm is sequentially bent at 90 degrees from the outer surfaces of the pole pieces on the two outermost layers of the lamination unit along the length extension direction of the diaphragm and then covers the two side surfaces of the lamination unit,
on the two side surfaces, the glue layer on the surface of the diaphragm is fused under the action of hot pressing to be combined with the pole piece on the surface of the glue layer and the glue layer of the diaphragm.
4. The laminated electrical core of a lithium ion battery of claim 1,
each lamination unit is provided with 2-10 pole pieces.
5. A lithium ion battery is characterized by comprising,
a shell body made of an aluminum-plastic film,
the laminated core body of lithium ion battery as claimed in any one of claims 1 to 4 sealed in the aluminum plastic film shell,
and the electrolyte is soaked in each pole piece and each diaphragm of the lithium ion battery laminated electric core body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921815811 | 2019-10-25 | ||
| CN2019218158111 | 2019-10-25 |
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| Publication Number | Publication Date |
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| CN210576277U true CN210576277U (en) | 2020-05-19 |
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| CN201921841125.1U Expired - Fee Related CN210576277U (en) | 2019-10-25 | 2019-10-30 | Lithium ion battery lamination electric core and lithium ion battery |
| CN201911123517.9A Pending CN111313099A (en) | 2019-10-25 | 2019-11-16 | Lithium ion battery lamination electric core body, lithium ion battery and lamination method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911123517.9A Pending CN111313099A (en) | 2019-10-25 | 2019-11-16 | Lithium ion battery lamination electric core body, lithium ion battery and lamination method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611912A (en) * | 2021-06-15 | 2021-11-05 | 万向一二三股份公司 | Laminated structure of electrode assembly, preparation method and electrochemical device |
| CN114976392A (en) * | 2021-02-26 | 2022-08-30 | 本田技研工业株式会社 | Soft package battery |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582751A (en) * | 2020-12-18 | 2021-03-30 | 微宏动力系统（湖州）有限公司 | Diaphragm, lithium battery and preparation method thereof |
| CN112864450A (en) * | 2021-01-14 | 2021-05-28 | 天能帅福得能源股份有限公司 | Lithium ion battery and preparation method thereof |
| CN113707946B (en) * | 2021-08-27 | 2023-09-01 | 远景动力技术(江苏)有限公司 | Laminated battery core and section packaging method thereof |
| CN115295866A (en) * | 2022-09-14 | 2022-11-04 | 星恒电源(滁州)有限公司 | Lithium ion battery core and lamination method thereof |
| JP2024087221A (en) * | 2022-12-19 | 2024-07-01 | 株式会社Ａｅｓｃジャパン | Battery Cell |
-
2019
- 2019-10-30 CN CN201921841125.1U patent/CN210576277U/en not_active Expired - Fee Related
- 2019-11-16 CN CN201911123517.9A patent/CN111313099A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114976392A (en) * | 2021-02-26 | 2022-08-30 | 本田技研工业株式会社 | Soft package battery |
| CN113611912A (en) * | 2021-06-15 | 2021-11-05 | 万向一二三股份公司 | Laminated structure of electrode assembly, preparation method and electrochemical device |
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| Publication number | Publication date |
|---|---|
| CN111313099A (en) | 2020-06-19 |
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Granted publication date: 20200519 Termination date: 20201030 |