CN214384767U - Safety lithium ion battery - Google Patents
Safety lithium ion battery Download PDFInfo
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- CN214384767U CN214384767U CN202120556660.3U CN202120556660U CN214384767U CN 214384767 U CN214384767 U CN 214384767U CN 202120556660 U CN202120556660 U CN 202120556660U CN 214384767 U CN214384767 U CN 214384767U
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- pole piece
- positive pole
- negative pole
- negative
- lithium ion
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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
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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a safe type lithium ion battery. Insulating coatings are designed on two sides of the positive pole piece in the length direction, and insulating adhesive tapes are designed and adhered on two sides of the positive pole piece in the width direction. And designing the shape and size of the positive pole piece to be consistent with those of the negative pole piece on the main plane of the battery core, and superposing the positive pole piece and the negative pole piece. The positive pole piece and the negative pole piece dislocation area with uneven stress are eliminated from the design of the battery cell product, the overall stress strength of the positive pole piece and the negative pole piece in the battery cell is increased, and the problem of short circuit in the battery caused by extrusion deformation of the pole pieces in the dislocation area is solved from the structural design of the battery cell, so that the safety of the lithium ion battery is improved.
Description
Technical Field
The utility model relates to an electrochemistry energy memory field especially relates to a safe type lithium ion battery.
Background
In order to avoid lithium precipitation of the negative pole piece in the charging process of the lithium ion battery, the negative pole piece is usually designed to cover the coating area of the positive pole piece, and the width and length directions of the negative pole piece are larger than those of the positive pole piece, so that the negative pole piece and the positive pole piece form a dislocation area on the overall dimension. The negative pole piece exceeds the positive pole piece, and a local cavity area is formed at the positive pole position corresponding to the dislocation area. The negative pole piece corresponding to the positive pole piece cavity area is easy to deform towards the positive pole piece cavity area under the action of external extrusion force, and a tip stress point is formed at the edge of the positive pole piece, so that the strain of the isolation membrane in the corresponding area is caused, and safety problems such as short circuit, high self-discharge rate, heating and even spontaneous combustion in the lithium ion battery are caused.
The lithium ion battery is widely applied to the fields of smart phones, notebook computers, new energy automobiles and the like. In order to extend the service life of the application terminal, consumers have made higher demands on the energy density of the lithium ion battery.
Some safety issues also arise in the process of increasing the energy density of lithium ion batteries. If the negative plate at the upper right corner of the battery core is pressed, the battery short circuit occurs, and the mobile phone spontaneous combustion and batch recall events are caused. The reason for this is that in order to improve the energy density of the battery, the space design of the inner pits of the battery negative plate and the aluminum-plastic film packaging bag is too small, the outer packaging aluminum-plastic film presses and deforms the negative plate, and a tip stress point is formed on the end face of the positive plate, so that strain of the isolation film in a corresponding area is caused, and short circuit, heating and spontaneous combustion in the lithium ion battery are caused.
Under the global carbon neutralization consensus, new energy automobiles are supported by the strategy of the main countries. China further takes the weight energy density of the power battery system as a core assessment index for application, popularization and financial subsidy. In order to improve energy density, manufacturers have introduced design schemes such as CTP and blade batteries, and the larger the lithium ion battery is, the more compact the battery pack structure is. The new energy automobile has complex application road conditions, and the lithium ion battery in the new energy automobile is subjected to vibration impact in various directions for a long time. When the lithium ion battery is enlarged, the self weight is obviously increased, the capability of the lithium ion battery for resisting vibration and impact is more sensitive, and even the phenomenon of reduction of vibration performance is caused, so that the internal structure of the lithium ion battery is damaged, and further the short circuit in the lithium ion battery is caused.
Therefore, it is necessary to improve the safety of the lithium ion battery.
SUMMERY OF THE UTILITY MODEL
In order to improve the safety problem of the lithium ion battery, the invention provides a safety lithium ion battery, which adopts the technical scheme as follows:
the utility model provides a safe type lithium ion battery, the core component is electric core, is formed its characterized in that by barrier film, negative pole piece, barrier film, positive pole piece, barrier film, negative pole piece, barrier film according to the preface lamination or convolute: and on the main plane of the battery cell, the overall dimension of the positive pole piece is designed to be consistent with that of the negative pole piece, the positive pole piece and the negative pole piece are superposed, and the battery cell is structurally designed without a positive pole piece and a negative pole piece dislocation area.
The positive pole piece comprises a positive pole piece body, a positive pole piece insulating layer, a positive pole lug and an insulating adhesive tape, wherein the positive pole piece body is a positive active material coating area, the two outer edges of the positive pole piece body are coated with the positive pole piece insulating layer, and the other two outer edges are pasted with the insulating adhesive tape.
And an insulating layer is arranged in the area where the positive pole lug is adjacent to the positive pole piece insulating layer.
The negative pole piece comprises a negative pole piece body and a negative pole lug, the negative pole piece body is a negative active material coating area, and the area of the negative pole lug adjacent to the negative pole piece body is coated with the negative active material.
The utility model is characterized in that: insulating coatings are designed on two sides of the positive pole piece in the length direction, and insulating adhesive tapes are designed and adhered on two sides of the positive pole piece in the width direction. And designing the shape and size of the positive pole piece to be consistent with those of the negative pole piece on the main plane of the battery core, and superposing the positive pole piece and the negative pole piece. The dislocation areas of the positive pole piece and the negative pole piece with uneven stress are eliminated from the design of the cell product, and the overall stress strength of the positive pole piece and the negative pole piece in the cell is increased. Meanwhile, in order to reduce burrs in the pole piece processing procedure and reduce the risk of internal short circuit caused by the burrs, the area of the positive pole lug adjacent to the positive pole piece insulating layer is coated with an insulating layer, and the area of the negative pole lug adjacent to the negative pole piece body is also coated with a negative active material.
The utility model has the advantages that: the positive pole piece and the negative pole piece dislocation area with uneven stress are eliminated from the design of the battery cell product, the overall stress strength of the positive pole piece and the negative pole piece in the battery cell is increased, and the problem of short circuit in the battery caused by extrusion deformation of the pole pieces in the dislocation area is solved from the structural design of the battery cell, so that the safety of the lithium ion battery is improved.
Drawings
FIG. 1: a schematic structural diagram of a safety lithium ion battery is provided.
FIG. 2: and a short circuit failure mechanism schematic diagram in the dislocation area of the dislocation design of the positive electrode and the negative electrode of the battery core.
FIG. 3: schematic diagram of coating and forming scheme of the positive pole piece in lamination process.
FIG. 4: schematic diagram of coating and forming scheme of positive pole piece in winding process.
FIG. 5: schematic diagram of positive pole piece forming in lamination process.
FIG. 6: schematic diagram of positive pole piece forming in winding process.
FIG. 7: schematic diagram of the forming of the negative pole piece in the lamination process.
FIG. 8: and (3) a schematic diagram of the forming of the negative pole piece by the winding process.
FIG. 9: schematic diagram of a lamination process battery cell design scheme.
FIG. 10: and (3) a schematic diagram of a winding process battery cell design scheme.
In the figure, a positive pole piece 1, a positive pole substrate 1-1, a positive pole piece body 1-2, a positive pole piece insulating layer 1-3, a positive pole tab 1-4, an insulating tape 1-5, an isolating membrane 2, a negative pole piece 3, a negative pole piece body 3-1, a negative pole tab 3-2, a negative pole adapter plate 4, an insulating film 5, a top cover plate 6, a negative pole post 6-1, negative pole post insulating plastic 6-2, a top cover inner plastic part 6-3, an insulating film and top cover inner plastic part heat fusion area 6-4, a metal square shell 7, an inner short circuit failure area 13, a positive and negative pole dislocation area 313 and an electric core 123.
Detailed Description
The present invention and the advantageous effects thereof will be described in detail with reference to the accompanying drawings and the detailed description.
Referring initially to FIG. 2: a schematic diagram of a short circuit failure mechanism in a dislocation area of a staggered design of positive and negative electrodes of a battery cell illustrates the problem to be solved by the prior art. In a battery cell (not shown), a negative electrode plate 3 is usually designed to cover a positive electrode plate 1, and dimensions of the negative electrode plate 3 in width and length directions are larger than those of the positive electrode plate 1, so that positive and negative electrode dislocation regions 313 are formed on the negative electrode plate 3 and the positive electrode plate 1 in shape dimensions. The negative pole piece 3 exceeds the positive pole piece 1, and a local cavity area is formed at the position of the positive pole piece 1 corresponding to the positive and negative electrode dislocation area 313. The negative pole piece 3 is easy to deform towards the cavity area of the positive pole piece 1 under the action of external extrusion force, tip stress points are formed at the edge of the positive pole piece 1, and after the isolating membrane 2 in the corresponding area is strained, an internal short circuit failure area 13 is formed, so that short circuit, heating and spontaneous combustion in the lithium ion battery are caused.
Embodiment 1 will be described in detail with reference to a metal square-shell lithium ion battery as an example.
Referring to FIG. 1: a safety lithium ion battery structure schematic diagram, refer to fig. 2: the schematic diagram of the short circuit failure mechanism in the dislocation area of the dislocation design of the positive electrode and the negative electrode of the battery cell illustrates the safety lithium ion battery provided by the invention.
The method comprises the following steps: the battery cell 123 comprises a positive electrode plate 1, a separation film 2 and a negative electrode plate 3;
and one end of the negative pole adapter sheet 4 is connected with the negative pole tab 3-2 in an ultrasonic welding mode, and the other end of the negative pole adapter sheet 4 is connected with the negative pole post 6-1 in a laser welding mode.
A positive pole adapter sheet (not shown), wherein one end of the positive pole adapter sheet is connected with the positive pole tabs 1-4 in an ultrasonic welding mode, and the other end of the positive pole adapter sheet is connected with the positive pole posts (not shown) in a laser welding mode;
the insulating film 5 wraps the battery cell 123 and is fixedly kept with the plastic part 6-3 in the top cover in a thermal welding mode;
the metal square shell 7 is used for accommodating the battery cell 123 wrapped with the insulating film, and is connected with the top cover plate 6 in a laser welding mode;
a top cover plate 6, wherein the top cover plate 6 is assembled with a negative pole post 6-1, negative pole post insulating plastic 6-2, a positive pole post (not shown), positive pole post conductive plastic (not shown) and a top cover inner plastic part 6-3, and is provided with an explosion-proof valve (not shown) and a liquid injection hole (not shown);
and an electrolyte (not shown) added to the inside of the lithium ion battery through a liquid inlet (not shown) of the top cover 6.
The main manufacturing process of the cell 123 is described below by taking a lamination process as an example.
Referring to FIG. 3: schematic diagram of coating and forming scheme of the lamination process positive pole piece, and fig. 5: a schematic diagram of the forming of the positive pole piece by the lamination process is that a positive pole piece body 1-2 and a positive pole piece insulating layer 1-3 are coated on two sides of a positive pole base material 1-1 in a clearance coating mode. According to the design size of the pole piece (shown as a dotted line in the figure), the appearance of the positive pole piece is formed in a laser cutting or hardware punching mode, the appearance comprises a positive pole tab 1-4, and insulating tapes 1-5 are adhered to two sides of the outer edges of the positive pole piece body 1-2 without the positive pole piece insulating layers 1-3, so that the positive pole piece 1 is formed. Wherein, the areas of the positive pole tabs 1-4 adjacent to the positive pole piece insulating layers 1-3 are provided with insulating layers.
Referring to FIG. 7: a schematic diagram of the forming of the negative pole piece by the lamination process is that a negative pole piece body 3-1 is coated on two sides of a negative pole base material (not shown) in a continuous coating mode, and the negative pole piece body 3-1 and a negative pole tab 3-2 are formed in a laser cutting or hardware punching mode to form the negative pole piece 3. The area of the negative pole tab 3-2 adjacent to the negative pole piece body 3-1 is also coated with a negative pole active material.
Referring to FIG. 1: a safety lithium ion battery structure schematic diagram, figure 9: schematic diagram of a lamination process battery cell design scheme. The separator 2, the negative electrode plate 3, the separator 2, the positive electrode plate 1, the separator 2, the negative electrode plate 3 and the separator 2 are laminated in sequence. On the main plane of the electric core 123, the overall dimension of the positive electrode plate 1 is designed to be consistent with that of the negative electrode plate 3, and the positive electrode plate 1 and the negative electrode plate 3 are superposed. On the main plane of the battery cell 123, the isolation film 2 exceeds the positive electrode tab 1 and the negative electrode tab 3. In the combination sequence, two surfaces of the positive pole piece 1 are coated by the isolating film 2, the outer side of the isolating film 2 corresponds to the negative pole piece 3, and the outer side of the negative pole piece 3 corresponds to the isolating film 2. The cell 123 has no positive and negative electrode dislocation regions 313 in its structural design.
The following describes the main manufacturing process of the battery cell 123 by taking a winding process as an example.
FIG. 4: schematic diagram of coating and forming scheme of positive pole piece in winding process, fig. 6: schematic diagram of positive pole piece forming in winding process. And coating the positive pole piece body 1-2 and the positive pole piece insulating layer 1-3 on two sides of the positive pole substrate 1-1 in a continuous coating mode. According to the design size of the pole piece (shown by a dotted line in the figure), the appearance of the positive pole piece is formed in a laser cutting or hardware punching mode, and the positive pole piece comprises positive pole lugs 1-4. And then adhering insulating tapes 1-5 to two edges of the two outer edges of the positive pole piece body 1-2 without the positive pole piece insulating layers 1-3 to form the positive pole piece 1. Wherein, the areas of the positive pole tabs 1-4 adjacent to the positive pole piece insulating layers 1-3 are provided with insulating layers.
Referring to FIG. 8: the forming schematic diagram of the negative pole piece of the winding process is that a negative pole piece body 3-1 is coated on two sides of a negative pole base material (not shown) in a continuous coating mode, and the negative pole piece body 3-1 and a negative pole tab 3-2 are formed in a laser cutting or hardware punching mode to form the negative pole piece 3. The area of the negative pole tab 3-2 adjacent to the negative pole piece body 3-1 is also coated with a negative pole active material.
Referring to FIG. 1: a schematic structural diagram of a safety lithium ion battery, fig. 10: and (3) a schematic diagram of a winding process battery cell design scheme. The separator 2, the negative electrode plate 3, the separator 2, and the positive electrode plate 1 are sequentially wound. On the main plane of the electric core 123, the overall dimension of the positive electrode plate 1 is designed to be consistent with that of the negative electrode plate 3, and the positive electrode plate 1 and the negative electrode plate 3 are superposed. On the main plane of the battery cell 123, the isolation film 2 exceeds the positive electrode tab 1 and the negative electrode tab 3. In the combination sequence, two surfaces of the positive pole piece 1 are coated by the isolating film 2, the outer side of the isolating film 2 corresponds to the negative pole piece 3, and the outer side of the negative pole piece 3 corresponds to the isolating film 2. The cell 123 has no positive and negative electrode dislocation regions 313 in its structural design.
In embodiment 2, a safety lithium ion battery is briefly described, taking an example in which a battery cell 123 is packaged by an aluminum plastic film to form a flexible package lithium ion battery. The flexible package lithium ion battery comprises:
the battery cell comprises a negative pole piece, an isolating membrane and a positive pole piece;
the positive pole adapter plate assembly is welded and connected with the positive pole piece;
the negative pole adapter plate assembly is welded with the negative pole piece;
the lithium ion battery comprises an aluminum-plastic packaging film, a positive electrode switching sheet assembly and a negative electrode switching sheet assembly, wherein the aluminum-plastic packaging film is formed to accommodate a battery cell and electrolyte, and partially encapsulate the positive electrode switching sheet assembly and the negative electrode switching sheet assembly to form a sealed space inside the lithium ion battery;
and the electrolyte is added into the lithium ion battery through the air pocket opening of the molded aluminum-plastic packaging film.
The manufacturing process of the cell 123 may be selected from the lamination or winding processes described above. Other assembly processing and assembling methods can be selected from industry common technologies, and detailed description is not expanded here.
In embodiment 3, a safety lithium ion battery is briefly described by taking an example in which a cylindrical lithium ion battery is formed by packaging a cell 123 with a cylindrical case. The cylindrical lithium ion battery includes:
the battery cell comprises a negative pole piece, an isolating membrane and a positive pole piece;
the positive pole lug is welded and connected with the positive pole piece;
the negative pole tab is connected with the negative pole piece in a welding manner;
the positive electrode cap component is welded with a positive electrode tab and is mechanically connected with the cylindrical shell to form a sealed space inside the lithium ion battery;
the lithium ion battery comprises a cylindrical shell, a positive electrode cap component and a negative electrode tab, wherein the cylindrical shell contains a battery core and electrolyte, the bottom of the shell is welded and connected with the negative electrode tab, and the top of the shell and the positive electrode cap component are mechanically pressed and packaged to form a lithium ion battery internal sealed space;
electrolyte added to the interior of the lithium ion battery through the cylindrical shell top port.
The manufacturing process of the battery cell 123 is similar to the winding process, and the main differences are that the number of the cylindrical lithium ion battery tabs is reduced, and the positive electrode tabs and the negative electrode tabs are located at two ends of the battery cell 123. Other assembly processing and assembling methods can be selected from industry common technologies, and detailed description is not provided herein.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (4)
1. The utility model provides a safe type lithium ion battery, the core component is electric core, is formed its characterized in that by barrier film, negative pole piece, barrier film, positive pole piece, barrier film, negative pole piece, barrier film according to the preface lamination or convolute: and designing the appearance size of the positive pole piece to be consistent with that of the negative pole piece on the main plane of the battery cell, wherein the positive pole piece is superposed with the negative pole piece, and the structural design of the battery cell is not provided with a dislocation area of the positive pole piece and the negative pole piece.
2. The safety lithium ion battery of claim 1, wherein: the positive pole piece comprises a positive pole piece body, a positive pole piece insulating layer, a positive pole lug and an insulating adhesive tape, wherein the positive pole piece body is a positive active material coating area, the two outer edges of the positive pole piece body are coated with the positive pole piece insulating layer, and the other two outer edges are pasted with the insulating adhesive tape.
3. The safety lithium ion battery of claim 2, wherein: and an insulating layer is arranged in the area where the positive pole lug is adjacent to the positive pole piece insulating layer.
4. The safety lithium ion battery of claim 3, wherein: the negative pole piece comprises a negative pole piece body and a negative pole lug, the negative pole piece body is a negative active material coating area, and the area of the negative pole lug adjacent to the negative pole piece body is coated with the negative active material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120556660.3U CN214384767U (en) | 2021-03-18 | 2021-03-18 | Safety lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120556660.3U CN214384767U (en) | 2021-03-18 | 2021-03-18 | Safety lithium ion battery |
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| CN214384767U true CN214384767U (en) | 2021-10-12 |
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| CN202120556660.3U Active CN214384767U (en) | 2021-03-18 | 2021-03-18 | Safety lithium ion battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597604A (en) * | 2022-03-21 | 2022-06-07 | 上海兰钧新能源科技有限公司 | Battery processing method and battery |
| CN114914549A (en) * | 2022-06-22 | 2022-08-16 | 上海兰钧新能源科技有限公司 | Battery with a battery cell |
| WO2024040472A1 (en) * | 2022-08-24 | 2024-02-29 | 宁德时代新能源科技股份有限公司 | Secondary battery, battery module, battery pack and electric apparatus |
-
2021
- 2021-03-18 CN CN202120556660.3U patent/CN214384767U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597604A (en) * | 2022-03-21 | 2022-06-07 | 上海兰钧新能源科技有限公司 | Battery processing method and battery |
| CN114597604B (en) * | 2022-03-21 | 2024-03-15 | 上海兰钧新能源科技有限公司 | Battery processing method and battery |
| CN114914549A (en) * | 2022-06-22 | 2022-08-16 | 上海兰钧新能源科技有限公司 | Battery with a battery cell |
| WO2024040472A1 (en) * | 2022-08-24 | 2024-02-29 | 宁德时代新能源科技股份有限公司 | Secondary battery, battery module, battery pack and electric apparatus |
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