CN210129558U - Lithium ion battery and lamination thereof - Google Patents
Lithium ion battery and lamination thereof Download PDFInfo
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- CN210129558U CN210129558U CN201920370959.2U CN201920370959U CN210129558U CN 210129558 U CN210129558 U CN 210129558U CN 201920370959 U CN201920370959 U CN 201920370959U CN 210129558 U CN210129558 U CN 210129558U
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- lithium ion
- ion battery
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- pole piece
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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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Abstract
The utility model relates to a lithium ion battery field discloses a lithium ion battery and lamination body thereof, and the lamination body includes: a plurality of positive plates that range upon range of each other, the negative pole piece, each positive plate, the negative pole piece center is just right, and the edge of negative pole piece surpasss the edge of each positive plate, be provided with a diaphragm layer between every adjacent positive plate, the negative pole piece respectively, it still is provided with a diaphragm layer to be located the outside of folding the piece body, and the edge of diaphragm layer surpasss the edge of negative pole piece, the edge that is located the negative pole piece on each diaphragm layer links together layer upon layer, every positive plate, the negative pole piece is spacing respectively between double-phase adjacent diaphragm layer, each positive plate, stretch out outside between the utmost point ear diaphragm layer of negative pole piece. By applying the technical scheme, the preparation efficiency of the laminated battery is improved, the appearance consistency of the battery is improved, and the displacement probability of the pole piece of the laminated body is reduced.
Description
Technical Field
The utility model relates to a lithium ion battery makes the field, especially relates to a lithium ion battery and lamination body thereof.
Background
The rechargeable lithium ion battery is the most widely applied battery in modern digital products such as mobile phones, notebook computers and the like. Among three battery forms of a cylinder, a square hard shell and a soft package lamination, the soft package battery has the characteristics of flexible design, light weight, small internal resistance, difficult explosion, more cycle times and the like, and the specific energy performance of the battery is also outstanding. Therefore, the laminated soft package power lithium ion battery is a hot spot of current research.
The inventor finds that the laminated lithium ion battery in the prior art has the following defects in the process of researching the invention:
1. the laminated body is fixed mainly by sticking adhesive tapes on the periphery of the laminated body after the laminated body is formed, so that the defect of low efficiency exists;
2. the pole pieces in the lamination are easy to shift, so that the problem of lithium precipitation of the positive electrode is caused, and the cycle performance and the safety performance of the lithium ion battery are influenced.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a lithium ion battery and lamination body thereof uses this technical scheme to be favorable to improving lamination battery's preparation efficiency, improves the outward appearance uniformity of battery, reduces the pole piece aversion probability of lamination body.
In a first aspect, the embodiment of the utility model provides a pair of lithium ion battery lamination body, include: a plurality of positive plates and negative plates which are mutually laminated, a diaphragm layer is respectively arranged between every two adjacent positive plates and negative plates, the edge of the diaphragm layer exceeds the edges of the positive plates and the negative plates, the edges of the diaphragm layers outside the negative plates and the positive plates are connected together in a hot melting way layer by layer,
and each positive plate and each negative plate are respectively limited between two adjacent diaphragm layers, and the tabs of each positive plate and each negative plate extend out of the space between the diaphragm layers.
Optionally, the outermost layer of the laminated body is a separator layer.
Optionally, the negative electrode sheet is pre-arranged in a separator bag, and the separator layers are the separator layers on the separator bag and positioned on two sides of the negative electrode sheet.
Alternatively, the hot-melt traces formed by the hot-melt bonding are continuous.
Optionally, the hot-melt tracks formed by the hot-melt bonding are discontinuous.
Optionally, the positive plate is pre-arranged in a diaphragm bag, and the diaphragm layers are diaphragm layers positioned on two sides of the positive plate on the diaphragm bag.
In a second aspect, an embodiment of the present invention provides a lithium ion battery, including:
a housing;
the lithium ion battery lamination body is sealed in the shell, and the tab extends out of the shell;
and the electrolyte is sealed in the shell and infiltrates the laminated body.
Optionally, the housing is an aluminum plastic film housing.
Optionally, the housing is a steel shell, or an aluminum shell.
It is from top to bottom visible, use the embodiment of the utility model provides a technical scheme, in this lamination, each positive plate is all spacing between two diaphragm layers of edge connection and be difficult for shifting, and each negative pole piece is also spacing also be difficult for shifting between two diaphragm layers of edge connection, and the lamination structure that visibly adopts this embodiment is favorable to reducing the probability that the pole piece shifted to improve lithium ion battery's cyclicity and security.
Compared with the mode of fixing the laminated body by the rubberized fabric in the prior art, the laminated body obtained by the technical scheme of the embodiment has better appearance consistency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute an undue limitation on the invention.
Fig. 1 is a schematic perspective structural diagram of a lithium ion battery lamination body provided in embodiment 1 of the present invention.
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 fig. 1, the present embodiment provides a lithium ion battery lamination body, which mainly includes: in the present embodiment, the area of the negative electrode material coating layer of each negative electrode sheet 102 is designed to be wider than the area of the positive electrode material coating layer of each positive electrode sheet 101, so that each edge of the negative electrode material coating layer of the negative electrode sheet 102 slightly exceeds each edge of the negative electrode material coating layer of the positive electrode sheet 101, thereby ensuring that each part of the positive electrode material coating layer on each positive electrode sheet 101 has the positive electrode material coating layer of the negative electrode sheet 102 facing each other.
A separator layer 103 is respectively arranged between any adjacent positive electrode sheet 101 and negative electrode sheet 102, and the edge of each separator layer 103 exceeds the edge of the negative electrode sheet 102. After lamination, the edges of the separator layer 103 exceeding the positive electrode sheet 101 and the negative electrode sheet 102 are connected layer by layer to obtain a laminated body with fixed periphery, and the tabs of the positive electrode sheet 101 and the negative electrode sheet 102 extend out of the separator layer 103 connected layer by layer to be used as electrodes led out.
As can be seen from the above, in the laminated body, each positive plate 101 is limited between the two diaphragm layers 103 connected at the edge and is not easy to displace, and each negative plate 102 is also limited between the two diaphragm layers 103 connected at the edge and is not easy to displace, and it can be seen that the laminated body structure of the present embodiment is favorable for reducing the probability of displacement of the plates, thereby improving the cycle performance and safety of the lithium ion battery.
Compared with the mode of fixing the laminated body by the rubberized fabric in the prior art, the laminated body obtained by the technical scheme of the embodiment has better appearance consistency.
In addition, in the embodiment, the diaphragm layer 103 with the margin can also effectively supplement the electric alkali solution gradually consumed by the battery cell in the using process, and effectively improve the battery performance.
As an illustration of the present embodiment, during lamination, but not limited to, the separator layer 103 is laminated on the bottom layer of the laminated body, and then the negative electrode sheet 102, the separator layer 103, the positive electrode sheet 101, and the separator layer 103, and the negative electrode sheet 102 are laminated layer by layer in this order, until a predetermined number of layers are laminated, the separator layer 103 is further covered on the negative electrode sheet 102 on the top layer, so as to obtain the laminated body with the bottom layer and the top layer both being the separator layer 103.
As an illustration of the present embodiment, but not limited to, a hot pressing jig matching the shape and size of the current laminated body may be designed, after the laminated body is obtained, the laminated body of the present embodiment is transferred to the hot pressing jig for hot pressing, and a high-temperature knife edge of the hot pressing jig presses the edges of the separator layer 103 outside the positive electrode sheet 101 and the negative electrode sheet 102 of the laminated body with a predetermined pressure, so that the edges of the separator layer 103 are heated, melted and combined together to form a hot pressing track consistent with the shape of the laminated body. As an illustration of this embodiment, the hot pressing track may be continuous or intermittent, and the intermittent design is further beneficial for the electrolyte to enter the lamination body.
As an illustration of this embodiment, in the present embodiment, a technical solution of making a negative electrode sheet bag is adopted, before lamination, the negative electrode sheet 102 is placed in a separator bag, so that a tab of the negative electrode sheet 102 extends out of the separator bag, and from a bottom layer, the negative electrode sheet separator bag (containing the negative electrode sheet 102) -the positive electrode sheet 101-the negative electrode sheet separator bag (containing the negative electrode sheet 102) are laminated layer by layer in the order of up to form a lithium ion battery laminate.
As an illustration of this embodiment, this embodiment may also be, but is not limited to, the technical solution of making a positive electrode sheet bag, before lamination, the positive electrode sheet 101 is placed in a separator bag, so that the tab of the positive electrode sheet 101 extends out of the separator bag, and the lithium ion battery stack is formed by stacking the separator layer 103, the negative electrode sheet 102, the positive electrode sheet separator bag (containing the positive electrode sheet 101), the negative electrode sheet 102, and the … … in this order layer by layer.
After the laminated body with the diaphragm edges connected together is obtained, further shell packaging is carried out, wherein the shell can be an aluminum plastic film shell, and can also be a steel shell or an aluminum shell, and the like, then processes such as electrolyte perfusion and the like are further carried out, so that the laminated lithium ion battery can be obtained, wherein the electrolyte and the laminated body of the embodiment are packaged in the shell, the laminated body is fully soaked by the electrolyte, and the lug of the laminated body extends out of the aluminum plastic film to serve as an electrode of the lithium ion battery.
The specific processes of aluminum plastic film packaging, electrolyte filling and the like can be referred to in the prior art.
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 (9)
1. A lithium ion battery lamination body is characterized by comprising: a plurality of positive plates and negative plates which are mutually laminated, a diaphragm layer is respectively arranged between every two adjacent positive plates and negative plates, the edge of the diaphragm layer exceeds the edges of the positive plates and the negative plates, the edges of the diaphragm layers outside the negative plates and the positive plates are connected together in a hot melting way layer by layer,
and each positive plate and each negative plate are respectively limited between two adjacent diaphragm layers, and the tabs of each positive plate and each negative plate extend out of the space between the diaphragm layers.
2. The lithium ion battery laminate of claim 1,
the outermost layer of the laminated body is a diaphragm layer.
3. The lithium ion battery laminate of claim 1,
the negative plate is pre-arranged in a diaphragm bag, and the diaphragm layers are diaphragm layers positioned on two sides of the negative plate on the diaphragm bag.
4. The lithium ion battery laminate of claim 3,
the hot melting track formed by hot melting combination is continuous.
5. The lithium ion battery laminate of claim 3,
the hot melting track formed by hot melting combination is discontinuous.
6. The lithium ion battery laminate of claim 1,
the positive plate is pre-arranged in a diaphragm bag, and the diaphragm layers are positioned on two sides of the positive plate on the diaphragm bag.
7. A lithium ion battery, comprising:
a housing;
the lithium ion battery laminate of any one of claims 1-6, sealed within the housing, with tabs extending from the housing;
and the electrolyte is sealed in the shell and infiltrates the laminated body.
8. The lithium ion battery according to claim 7,
the shell is an aluminum plastic film shell.
9. The lithium ion battery according to claim 7,
the shell is a steel shell or an aluminum shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370959.2U CN210129558U (en) | 2019-03-21 | 2019-03-21 | Lithium ion battery and lamination thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370959.2U CN210129558U (en) | 2019-03-21 | 2019-03-21 | Lithium ion battery and lamination thereof |
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| Publication Number | Publication Date |
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| CN210129558U true CN210129558U (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920370959.2U Active CN210129558U (en) | 2019-03-21 | 2019-03-21 | Lithium ion battery and lamination thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259804A (en) * | 2020-03-31 | 2021-01-22 | 蜂巢能源科技有限公司 | Lamination method of pole group and lamination device of pole group |
| CN114937818A (en) * | 2022-03-28 | 2022-08-23 | 江苏正力新能电池技术有限公司 | Battery pole group, battery, electric device and preparation method of battery pole group |
-
2019
- 2019-03-21 CN CN201920370959.2U patent/CN210129558U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259804A (en) * | 2020-03-31 | 2021-01-22 | 蜂巢能源科技有限公司 | Lamination method of pole group and lamination device of pole group |
| CN114937818A (en) * | 2022-03-28 | 2022-08-23 | 江苏正力新能电池技术有限公司 | Battery pole group, battery, electric device and preparation method of battery pole group |
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