CN113013553A - Diaphragm bag, electric core and lithium ion battery - Google Patents
Diaphragm bag, electric core and lithium ion battery Download PDFInfo
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- CN113013553A CN113013553A CN202110181898.7A CN202110181898A CN113013553A CN 113013553 A CN113013553 A CN 113013553A CN 202110181898 A CN202110181898 A CN 202110181898A CN 113013553 A CN113013553 A CN 113013553A
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- receiving groove
- bag
- opening
- septum
- battery cell
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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
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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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a diaphragm bag, a battery cell and a lithium ion battery, wherein the diaphragm bag comprises: the N first accommodating grooves are used for inserting the positive plates, and N is a positive integer; the N +1 second accommodating grooves are used for inserting the negative plates; the first containing grooves and the second containing grooves are arranged alternately along the thickness direction of the diaphragm bag, and the projection of the boundary of the first containing grooves along the thickness direction is positioned in the boundary of the second containing grooves. The diaphragm bag can effectively control the relative positions of the positive plate and the negative plate, and effectively solves the problem of short circuit of lithium precipitation of the battery cell.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a diaphragm bag, a battery cell and a lithium ion battery.
Background
At present, the lithium ion battery is generally produced by adopting a winding process or a lamination process, while the soft-package battery core generally adopts the lamination process, and the lamination process comprises a Z-shaped lamination method, a lamination method and a four-layer unit lamination method. The Z-shaped lamination method is characterized in that positive and negative plates are stacked together through certain crossing sequence by swinging the diaphragms back and forth in a Z shape. Receiving the influence of equipment pile up the precision, there is the fluctuation in the border of negative pole piece and the border of positive plate's distance, leads to the negative pole piece to have the risk that can not wrap up the positive plate completely, and the problem of lithium analysis short circuit appears in the electric core easily, and there is the potential safety hazard in the electric core.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a diaphragm bag which can control the distance between the edge of a positive plate and the edge of a negative plate and effectively solve the problem of short circuit caused by lithium precipitation of a battery cell.
The invention also provides a battery cell with the diaphragm bag.
The invention also provides a lithium ion battery with the battery cell.
According to an embodiment of the first aspect of the invention, a membrane bag has:
the N first accommodating grooves are used for inserting the positive plates, and N is a positive integer;
the N +1 second accommodating grooves are used for inserting the negative plates;
the first accommodating grooves and the second accommodating grooves are arranged alternately along the thickness direction of the diaphragm bag, and the projection of the boundary of the first accommodating grooves along the thickness direction is positioned in the boundary of the second accommodating grooves.
The membrane bag provided by the embodiment of the invention has at least the following beneficial effects: the second storage tank is one more than the first storage tank, along the thickness direction of diaphragm bag, first storage tank and second storage tank set up alternately, and the projection of the boundary of first storage tank along thickness direction, be located the boundary of second storage tank, from this, the positive plate is inserted and is established in first storage tank, the negative plate is inserted and is established back in the second storage tank, the distance at the border of positive plate and the border of negative plate is mainly confirmed by the diaphragm bag, the boundary of second storage tank is wider than the boundary of first storage tank, also the negative plate can cover the positive plate completely, the problem that lithium short circuit is analysed to electric core has effectively been solved.
According to some embodiments of the present invention, the first receiving groove and the second receiving groove are both rectangular, a length a of the first receiving groove is smaller than a length b of the second receiving groove, and a width c of the first receiving groove is smaller than a width d of the second receiving groove.
According to some embodiments of the present invention, along a length direction of the diaphragm bag, distances from two ends of the second receiving groove to the first receiving groove are equal, and along a width direction of the diaphragm bag, distances from two ends of the second receiving groove to the first receiving groove are equal.
According to some embodiments of the present invention, a difference between lengths of the first receiving groove and the second receiving groove is 0.01 to 2mm, and a difference between widths of the first receiving groove and the second receiving groove is 0.01 to 2 mm.
According to some embodiments of the invention, the septum bag has a first opening communicating with the first receiving groove, and a second opening communicating with the second receiving groove; the first opening and the second opening are located on the same side of the septum bag, or the first opening and the second opening are located on two adjacent sides of the septum bag, or the first opening and the second opening are located on two opposite sides of the septum bag.
The battery cell according to the embodiment of the second aspect of the invention comprises:
a membrane bag according to any of claims 1 to 5;
the positive plate is inserted in the first accommodating groove;
and the negative plate is inserted in the second accommodating groove.
The battery cell provided by the embodiment of the invention at least has the following beneficial effects: by using the diaphragm bag, the relative position of the positive plate and the negative plate is determined by the diaphragm bag, the boundary of the second accommodating groove is wider than that of the first accommodating groove, namely the negative plate can completely cover the positive plate, and the problem of short circuit caused by lithium precipitation of the battery cell is effectively solved.
According to some embodiments of the invention, the positive electrode sheet is fixed to the separator bag by an adhesive tape, and the negative electrode sheet is fixed to the separator bag by an adhesive tape.
According to some embodiments of the invention, the positive electrode sheet is fixedly connected with the separator bag through hot pressing, and the negative electrode sheet is fixedly connected with the separator bag through hot pressing.
According to some embodiments of the invention, the material of the membrane bag is a gel membrane.
The lithium ion battery provided by the embodiment of the third aspect of the invention comprises the battery cell, wherein the battery cell is provided with a plurality of battery cells, and the plurality of battery cells are mutually connected in series or in parallel.
The lithium ion battery provided by the embodiment of the invention has at least the following beneficial effects: by using the battery cell, the problem of short circuit caused by lithium precipitation of the battery cell is effectively solved, and the safety performance of the lithium ion battery is good.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a front view of a septum bag according to an embodiment of the present invention;
FIG. 2 is a left side view of the septum bag of FIG. 1;
FIG. 3 is a top view of the septum bag of FIG. 1;
fig. 4 shows the alignment of the positive plate and the negative plate of the battery cell manufactured by the conventional Z-shaped lamination method;
fig. 5 shows the alignment of the positive electrode plate and the negative electrode plate of the battery cell according to the embodiment of the invention.
Reference numerals: a diaphragm bag 100, a first receiving groove 110, and a second receiving groove 120.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Referring to fig. 1 and 2, a membrane bag 100 according to an embodiment of the present invention has: the N first accommodating grooves 110 are used for inserting the positive plates, and N is a positive integer; the N +1 second accommodating grooves 120 are used for inserting the negative plates; the first receiving grooves 110 and the second receiving grooves 120 are disposed alternately along a thickness direction (e.g., a left-right direction in fig. 1) of the diaphragm bag 100, and a projection of a boundary of the first receiving grooves 110 along the thickness direction of the diaphragm bag 100 is located within a boundary of the second receiving grooves 120.
In combination with the above, after the positive plate is inserted into the first receiving groove 110 and the negative plate is inserted into the second receiving groove 120, the distance between the edge of the positive plate and the edge of the negative plate is mainly determined by the diaphragm bag 100, and the projection of the boundary of the first receiving groove 110 along the thickness direction of the diaphragm bag 100 is located in the boundary of the second receiving groove 120, that is, the boundary of the second receiving groove 120 is wider than the boundary of the first receiving groove 110, so that the negative plate can completely cover the positive plate, and the problem of short circuit caused by lithium precipitation of the battery cell is effectively solved.
Referring to fig. 1 to 3, in some embodiments of the present invention, the first receiving groove 110 and the second receiving groove 120 are both rectangular parallelepiped, a length a of the first receiving groove 110 is smaller than a length b of the second receiving groove 120, and a width c of the first receiving groove 110 is smaller than a width d of the second receiving groove 120. Therefore, after the positive plate is inserted into the first accommodating groove 110 and the negative plate is inserted into the second accommodating groove 120, the negative plate can cover the positive plate in both the length direction and the width direction, so that the problem of lithium precipitation short circuit of the square battery cell is effectively solved.
In addition, the cross-sections of the first receiving groove 110 and the second receiving groove 120 may also be triangular or semicircular.
Referring to fig. 1 to 3, in a further embodiment of the present invention, along a length direction (e.g., an up-down direction in fig. 1) of the membrane bag 100, distances between two ends of the second receiving groove 120 beyond the first receiving groove 110 are equal, that is, the distance e is equal to the distance f. Along the width direction (e.g., the front-back direction in fig. 3) of the diaphragm bag 100, the distances between the two ends of the second receiving groove 120 beyond the first receiving groove 110 are equal, that is, the distance g is equal to the distance h.
At this time, in the length direction of the diaphragm bag 100, the portion of the second receiving groove 120 beyond the first receiving groove 110 is equally divided to the upper end and the lower end of the second receiving groove 120; in the width direction of the diaphragm bag 100, the portion of the second receiving groove 120 beyond the first receiving groove 110 is equally divided to the front end and the rear end of the second receiving groove 120. That is, the portion of the second receiving groove 120 beyond the first receiving groove 110 is uniformly distributed around the first receiving groove 110, and the negative electrode tab is uniformly beyond the positive electrode tab. In this case, the problem of lithium deposition short circuits does not easily occur around the positive electrode sheet.
Referring to fig. 1 to 3, in a further embodiment of the present invention, a difference between lengths of the first receiving groove 110 and the second receiving groove 120 is 0.01 to 2mm, and a difference between widths of the first receiving groove 110 and the second receiving groove 120 is 0.01 to 2 mm. The length difference and the width difference of 0.01-2 mm can not only effectively solve the problem of lithium analysis short circuit, but also avoid the size of the second accommodating groove 120 exceeding the first accommodating groove 110 too much, and avoid the electric core capacity loss too large.
Specifically, the difference between the lengths of the first receiving groove 110 and the second receiving groove 120 may be 0.5mm, 1mm, 2mm or other values, and the difference between the widths of the first receiving groove 110 and the second receiving groove 120 may be 0.5mm, 1mm, 2mm or other values. Wherein, when the length difference and the width difference are both 2mm, the embodiment is better.
Referring to fig. 1-3, in some embodiments of the present invention, the membrane bag 100 has a first opening in communication with the first receiving groove 110 and a second opening in communication with the second receiving groove 120. The first and second openings are located on the same side of the septum bag 100, or the first and second openings are located on adjacent sides of the septum bag 100, or the first and second openings are located on opposite sides of the septum bag 100.
The first opening is used for inserting the positive electrode tab into the first receiving groove 110, and the second opening is used for inserting the negative electrode tab into the second receiving groove 120. When the first opening and the second opening are located on the same side of the separator bag 100, the positive plate and the negative plate can be inserted from the same side of the separator bag 100, and the operation is convenient. When the first opening and the second opening are respectively located at two adjacent sides of the separator bag 100, or when the first opening and the second opening are respectively located at two opposite sides of the separator bag 100, the inlet positions of the positive electrode sheet and the negative electrode sheet are different, and the positive electrode sheet and the negative electrode sheet are easily distinguished.
Referring to fig. 1 to 3, a battery cell according to an embodiment of the present invention includes: the membrane bag 100 described above; a positive electrode tab inserted into the first receiving groove 110; and the negative electrode tab is inserted into the second receiving groove 120.
After the diaphragm bag 100 is used, the distance between the edge of the positive plate and the edge of the negative plate is mainly determined by the diaphragm bag 100, the boundary of the second accommodating groove 120 is wider than the boundary of the first accommodating groove 110, that is, the negative plate can completely cover the positive plate, and the problem of short circuit caused by lithium precipitation of the battery cell is effectively solved.
Referring to fig. 1 to 3, in some embodiments of the present invention, the positive electrode sheet is adhesively fixed to the separator bag 100 by an adhesive tape, and the negative electrode sheet is adhesively fixed to the separator bag 100 by an adhesive tape. That is, after the positive plate and the negative plate are inserted into the separator bag 100, the first opening and the second opening of the separator bag 100 are pasted with adhesive tapes, so that the positive plate and the negative plate are fixed in the separator bag 100, and the positive plate and the negative plate are prevented from falling off. The adhesive tape can simply and quickly realize the fixation of the positive plate and the negative plate.
Referring to fig. 1 to 3, in some embodiments of the present invention, the positive electrode sheet is fixedly connected to the separator bag 100 by hot pressing, and the negative electrode sheet is fixedly connected to the separator bag 100 by hot pressing. After the positive plate and the negative plate are inserted into the diaphragm bag 100, hot pressing is carried out, the heated diaphragm bag 100 has viscosity, and the positive plate and the negative plate are both adhered and fixed with the diaphragm bag 100 under the action of pressure. By using the hot pressing process, the positive plate and the negative plate can be fixed without using other materials, the working procedures are less, and the production efficiency is high.
Referring to fig. 1-3, in some embodiments of the invention, the material of the membrane bag 100 is a gel membrane. The diaphragm bag 100 made of the gel diaphragm material can fix the positive plate and the negative plate by hot pressing, and can also fix the positive plate and the negative plate by a tape. The gel separator has excellent thermal dimensional stability, and can effectively prevent short circuit explosion accidents caused by melting and shrinking of the separator in a heating state of the battery. The battery core made of the gel diaphragm has good safety performance.
The lithium ion battery provided by the embodiment of the invention comprises the battery cells, wherein the battery cells are arranged in plurality, and the plurality of battery cells are mutually connected in series or in parallel. By using the battery cell, the problem of short circuit caused by lithium precipitation of the battery cell is effectively solved, and the safety performance of the lithium ion battery is good.
Referring to fig. 4 and 5, fig. 4 shows the alignment of the positive and negative plates of the battery cell manufactured by the conventional Z-shaped lamination method, and fig. 5 shows the alignment of the positive and negative plates of the battery cell according to the embodiment of the present invention. The stacking layers of the battery cells are 32 negative electrode sheets and 31 positive electrode sheets, the length and width of each positive electrode sheet is 310 × 92mm, the thickness of each positive electrode sheet is 125 μm, the length and width of each negative electrode sheet is 312 × 94mm, and the thickness of each negative electrode sheet is 162 μm.
The membrane bag 100 employs a single layer of 13 μm thick non-gel membrane. The length a of the first receiving groove 110 is 310mm, the width c of the first receiving groove 110 is 92.1mm, and the height of the first receiving groove 110 is 220 μm. The length b of the second receiving groove 120 is 312mm, the width d of the second receiving groove 120 is 94.1mm, and the thickness of the second receiving groove 120 is 260 μm. The length difference of the first accommodating groove 110 and the second accommodating groove 120 is 2mm, the width direction difference is 1mm, and 20 battery cells are manufactured respectively.
As can be seen from fig. 4 and 5, in the battery cell manufactured by the conventional Z-shaped lamination method, the alignment degrees of the positive electrode plates and the negative electrode plates are relatively discrete, and the alignment degrees of the positive electrode plates and the negative electrode plates of the battery cell according to the embodiment of the present invention are relatively concentrated. That is, the positions of the positive plate and the negative plate of the battery cell in the embodiment of the invention are stable and tend to be consistent, and the edge of the positive plate is not easy to exceed the edge of the negative plate, so that the problem of short circuit caused by lithium precipitation of the battery cell is effectively solved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A membrane bag, comprising:
the N first accommodating grooves are used for inserting the positive plates, and N is a positive integer;
the N +1 second accommodating grooves are used for inserting the negative plates;
the first accommodating grooves and the second accommodating grooves are arranged alternately along the thickness direction of the diaphragm bag, and the projection of the boundary of the first accommodating grooves along the thickness direction is positioned in the boundary of the second accommodating grooves.
2. The membrane bag according to claim 1, wherein the first receiving groove and the second receiving groove are each rectangular parallelepiped, a length a of the first receiving groove is smaller than a length b of the second receiving groove, and a width c of the first receiving groove is smaller than a width d of the second receiving groove.
3. The septum bag of claim 2, wherein the distance between the two ends of the second receiving groove beyond the first receiving groove is equal along the length direction of the septum bag, and the distance between the two ends of the second receiving groove beyond the first receiving groove is equal along the width direction of the septum bag.
4. The membrane bag according to claim 2 or 3, wherein the difference between the lengths of the first receiving groove and the second receiving groove is 0.01-2 mm, and the difference between the widths of the first receiving groove and the second receiving groove is 0.01-2 mm.
5. The septum bag of claim 1, wherein the septum bag has a first opening in communication with the first receiving groove and a second opening in communication with the second receiving groove; the first opening and the second opening are located on the same side of the septum bag, or the first opening and the second opening are located on two adjacent sides of the septum bag, or the first opening and the second opening are located on two opposite sides of the septum bag.
6. Electric core, its characterized in that includes:
a membrane bag according to any of claims 1 to 5;
the positive plate is inserted in the first accommodating groove;
and the negative plate is inserted in the second accommodating groove.
7. The battery cell of claim 6, wherein the positive electrode sheet is fixedly bonded to the separator bag by an adhesive tape, and the negative electrode sheet is fixedly bonded to the separator bag by an adhesive tape.
8. The battery cell of claim 6, wherein the positive electrode sheet is fixedly connected with the separator bag through hot pressing, and the negative electrode sheet is fixedly connected with the separator bag through hot pressing.
9. The electrical core of claim 7 or 8, wherein the material of the membrane bag is a gel membrane.
10. A lithium ion battery, comprising the battery cell of any of claims 6 to 9, wherein the battery cell is provided with a plurality of battery cells, and the plurality of battery cells are connected in series or in parallel with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110181898.7A CN113013553A (en) | 2021-02-08 | 2021-02-08 | Diaphragm bag, electric core and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110181898.7A CN113013553A (en) | 2021-02-08 | 2021-02-08 | Diaphragm bag, electric core and lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN113013553A true CN113013553A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110181898.7A Pending CN113013553A (en) | 2021-02-08 | 2021-02-08 | Diaphragm bag, electric core and lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793972A (en) * | 2021-09-14 | 2021-12-14 | 珠海冠宇电池股份有限公司 | Battery and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102683742A (en) * | 2012-06-12 | 2012-09-19 | 东莞新能源科技有限公司 | Lithium ion battery cell and preparation method thereof |
| CN106099132A (en) * | 2016-08-30 | 2016-11-09 | 惠州市惠德瑞锂电科技股份有限公司 | A kind of lithium battery core body and the lithium primary battery of gained |
| CN210403945U (en) * | 2019-08-06 | 2020-04-24 | 重庆市维都利新能源有限公司 | Laminated lithium ion battery |
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2021
- 2021-02-08 CN CN202110181898.7A patent/CN113013553A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102683742A (en) * | 2012-06-12 | 2012-09-19 | 东莞新能源科技有限公司 | Lithium ion battery cell and preparation method thereof |
| CN106099132A (en) * | 2016-08-30 | 2016-11-09 | 惠州市惠德瑞锂电科技股份有限公司 | A kind of lithium battery core body and the lithium primary battery of gained |
| CN210403945U (en) * | 2019-08-06 | 2020-04-24 | 重庆市维都利新能源有限公司 | Laminated lithium ion battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793972A (en) * | 2021-09-14 | 2021-12-14 | 珠海冠宇电池股份有限公司 | Battery and preparation method thereof |
| CN113793972B (en) * | 2021-09-14 | 2023-02-17 | 珠海冠宇电池股份有限公司 | Battery and preparation method thereof |
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