CN217507426U - Flexible lithium ion battery - Google Patents
Flexible lithium ion battery Download PDFInfo
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- CN217507426U CN217507426U CN202220468598.7U CN202220468598U CN217507426U CN 217507426 U CN217507426 U CN 217507426U CN 202220468598 U CN202220468598 U CN 202220468598U CN 217507426 U CN217507426 U CN 217507426U
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Abstract
The utility model relates to a flexible lithium ion battery, it includes: the basic battery unit comprises a cathode sheet, a first diaphragm mechanism and two anode sheets, wherein the two anode sheets are respectively overlapped and arranged on two opposite sides of the cathode sheet, the first diaphragm mechanism is arranged between the anode sheet and the cathode sheet, and the first diaphragm mechanism is used for separating the anode sheet and the cathode sheet so as to prevent the anode sheet and the cathode sheet from being short-circuited. The utility model discloses a flexible lithium ion battery, it can improve active material's utilization ratio, and then improves the energy density among the flexible lithium ion battery.
Description
Technical Field
The utility model belongs to the technical field of the technique of lithium cell and specifically relates to flexible lithium ion battery.
Background
The lithium ion battery has the advantages of high open circuit voltage, long cycle life, small self-discharge rate, no memory effect and the like, and is widely applied to the fields of power batteries, energy storage, 3C consumption and the like. The lithium ion battery can be divided into a square aluminum shell, a steel shell cylinder and a soft-package aluminum-plastic film battery according to the shell/appearance form, and the lithium ion battery taking the soft-package aluminum-plastic film as the shell material has better appearance design flexibility and is convenient for customized production according to the requirements of customers.
In recent years, with the rapid development of intelligent wearable electronic devices (such as intelligent earphones, intelligent watches, intelligent bracelets, intelligent glasses and the like), the consumer market has made higher demands on battery technology. The flexible package lithium ion battery with long endurance, quick charging, thinning and flexibility is favored by the market.
The chinese utility model patent with the current publication number CN111682267A discloses a method for preparing a flexible battery of wearable equipment, comprising: a positive plate, a diaphragm and a negative plate; the positive plate comprises a positive film and the negative plate comprises a negative film, wherein the positive film and the negative film are stacked in a multi-layer mode, and the diaphragm, the binder in the positive film and the binder in the negative film are the same in component. According to the flexible lithium ion battery, the positive and negative pole pieces are arranged in the multi-layer lamination manner, so that the stress of the pole pieces in the deformation process can be effectively relieved, the phenomenon that the pole pieces are easy to break due to the fact that the deformation of the outermost layer is larger than that of the inner layer in the deformation process of the pole pieces with the single-layer structure is avoided, and the stability and the safety of the flexible battery are improved. The material which is the same as the anode and cathode binders is used as the diaphragm, and the positive plate, the negative plate and the diaphragm are tightly combined through the affinity among the same substances, so that the transmission of ions among different functional layers is facilitated, and the electrochemical performance of the battery is improved.
In the related art described above, the inventors consider that there is a defect: because the positive plate is formed by laminating a plurality of positive films and the negative plate is formed by laminating a plurality of negative films in the technical scheme, the laminating mode is easy to reduce the utilization rate of the active substances, thereby greatly reducing the energy density of the battery.
The above drawbacks are expected to be overcome by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems in the prior art, the utility model provides a flexible lithium ion battery, it can improve active material's utilization ratio, and then improves the energy density among the flexible lithium ion battery.
In order to achieve the above object, the utility model discloses a main technical scheme include:
a flexible lithium-ion battery, comprising: the basic battery unit comprises a cathode sheet, a first diaphragm mechanism and two anode sheets, wherein the two anode sheets are respectively overlapped and arranged on two opposite sides of the cathode sheet, the first diaphragm mechanism is arranged between the anode sheet and the cathode sheet, and the first diaphragm mechanism is used for separating the anode sheet and the cathode sheet.
During implementation, the two anode sheets are respectively overlapped and arranged on the two opposite sides of the cathode sheet, so that the two opposite sides of the cathode sheet and the anode sheet are subjected to ion migration, the ion migration efficiency in the flexible lithium ion battery is improved, the utilization rate of active substances is improved, the energy density in the flexible lithium ion battery is also improved, and the first diaphragm mechanism is utilized, so that direct contact between the cathode sheet and the anode sheet is prevented, and the first diaphragm mechanism is used for preventing short circuit in basic battery units.
In an embodiment of the present invention, the anode sheet includes an anode current collecting layer and two anode coating layers, two layers the anode coating layers are respectively coated on two opposite sides of the anode current collecting layer.
When the method is implemented, two anode coating layers are utilized, and the energy density of the anode sheet is further improved.
In one embodiment of the present invention, the cathode sheet includes a cathode current collector layer and two cathode coating layers respectively coated on opposite sides of the cathode current collector layer.
When the cathode sheet is implemented, two cathode coating layers are utilized, and the energy density of the cathode sheet is further improved.
In one embodiment of the present invention, the area of the side surface of the anode coating layer is larger than the area of the side surface of the cathode coating layer.
When the flexible lithium ion battery is charged, lithium ions transferred by the cathode sheet can be completely received by the anode sheet, so that the phenomenon of lithium separation is avoided.
In one embodiment of the present invention, the first diaphragm mechanism includes two first diaphragms, the two first diaphragms are respectively overlapped on the two opposite sides of the cathode sheet, and the lateral area of the first diaphragm is larger than that of the anode coating layer.
The utility model discloses an embodiment, basic battery unit's quantity is for being no less than one, is no less than one basic battery unit superposes the setting in proper order.
When the flexible lithium ion battery is implemented, at least one basic battery unit is utilized, and the energy density of the flexible lithium ion battery is further improved.
In one embodiment of the present invention, an insulating film is provided between adjacent basic battery cells, and the insulating film is used to prevent short circuit between adjacent two basic battery cells.
The utility model discloses an in one embodiment, still include the wrapping bag, the wrapping bag is used for the holding and encapsulates basic battery unit, the wrapping bag is provided with first adhesive linkage, first adhesive linkage is used for supplying basic battery unit with the wrapping bag bonding is fixed.
At the in-process of assembly flexible lithium ion battery, heat the pressurization to basic battery cell and wrapping bag, first adhesive linkage melts and fuses each other, thereby can finalize the design to flexible lithium ion battery in advance and strengthen structural stability, prevents that flexible lithium ion battery later stage shape from kick-backing.
When the flexible lithium ion battery is used in the later period, the flexible lithium ion battery has a good deformation effect.
The utility model discloses an in the embodiment, still include second diaphragm mechanism, second diaphragm mechanism includes two second diaphragms, two the second diaphragm set up respectively in basic cell's relative both sides, the second diaphragm is used for bonding basic cell and wrapping bag.
In one embodiment of the present invention, the first diaphragm and the second diaphragm are both provided with a second adhesive layer.
In implementation, the first diaphragm is bonded and fixed with the cathode sheet and the anode sheet at the same time in the battery basic unit by using the second bonding layer; in the packaging bag, the second diaphragm is fixedly bonded with the basic cell of the battery, so that the deformation effect of the flexible lithium ion battery in the later use process is further improved.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the two anode sheets are respectively overlapped and arranged on the two opposite sides of the cathode sheet, so that the two opposite sides of the cathode sheet and the anode sheet are subjected to ion migration, the ion migration efficiency in the flexible lithium ion battery is improved, the utilization rate of active substances is further improved, the energy density in the flexible lithium ion battery is also improved, and the first diaphragm mechanism is utilized, so that the cathode sheet and the anode sheet are prevented from being in direct contact, and the first diaphragm mechanism is further used for preventing the occurrence of short circuit in basic battery units;
2. the energy density of the flexible lithium ion battery is improved by utilizing at least one basic battery unit;
3. the bonding layer is utilized to tightly bond and fix the basic battery unit and the packaging bag, and when the flexible lithium ion battery is used in the later period, the flexible lithium ion battery has a good deformation effect.
Drawings
Fig. 1 is a partial structural sectional view of a flexible lithium ion battery according to an embodiment of the present invention;
FIG. 2 is a partial cross-sectional view of an anode sheet according to an embodiment of the present invention;
FIG. 3 is a partial structural elevation view of an anode sheet according to an embodiment of the present invention;
FIG. 4 is a partial cross-sectional view of a cathode plate according to an embodiment of the present invention;
FIG. 5 is a front view of a cathode plate according to an embodiment of the present invention;
FIG. 6 is a front view of a portion of a package according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a portion of a package according to an embodiment of the present invention;
fig. 8 is a partial structural sectional view of two adjacent basic battery cells and an insulating film according to an embodiment of the present invention.
[ description of reference ]
1. A basic battery cell; 2. a cathode plate; 21. a cathode current collector layer; 22. a cathode coating layer; 23. a cathode foil empty region; 24. a cathode coating region; 25. a female tab; 26. gluing a tab; 3. a first diaphragm mechanism; 31. a first separator; 4. an anode sheet; 41. an anode current collector layer; 42. an anode coating layer; 43. an anode empty foil region; 44. an anodic coating region; 45. an anode tab; 5. an insulating film; 6. packaging bags; 61. a polypropylene layer; 62. a metal layer; 63. a nylon layer; 64. an accommodating cavity; 65. sealing; 7. a second diaphragm mechanism; 71. a second diaphragm; 8. a first adhesive layer; 9. and a second adhesive layer.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
The utility model discloses a flexible lithium ion battery of an embodiment please refer to and show in fig. 1, a flexible lithium ion battery, it includes: the basic battery unit 1.
Referring to fig. 1, a basic battery cell 1 includes a cathode sheet 2, a first separator mechanism 3, and two anode sheets 4. The two anode strips 4 are respectively arranged on two opposite sides of the cathode strip 2 in an overlapping manner. Specifically, the first diaphragm mechanism 3 includes two first diaphragms 31, one of the first diaphragms 31 is stacked between one side of one of the anode strips 4 and the cathode strip 2, the other one of the first diaphragms 31 is stacked between the other side of the other one of the anode strips 4 and the cathode strip 2, and the first diaphragm mechanism 3 is further disposed between the anode strips 4 and the cathode strip 2, so that the first diaphragm mechanism 3 is utilized to prevent the short circuit between the anode strips 4 and the cathode strip 2 in the later use process of the flexible lithium ion battery.
When the flexible lithium ion battery needs to be used, one anode sheet 4 and one side surface of the cathode sheet 2 are overlapped, so that ion migration can be performed between the anode sheet 4 and the cathode sheet 2, and further electric energy is generated; by means of the superposition of the other side face of the other anode strip 4 and the other side face of the cathode strip 2, the anode strip 4 and the cathode strip 2 can carry out ion migration, and further electric energy is generated, so that the basic battery unit 1 improves the efficiency of ion migration, the utilization rate of active substances in the basic battery unit 1 is improved, and further the energy density in the flexible lithium ion battery is improved.
Referring to fig. 1, 2 and 3, in particular, the anode sheet 4 includes an anode current collecting layer 41 and two anode coating layers 42, and the two anode coating layers 42 are respectively coated on two opposite sides of the anode current collecting layer 41. With two anode coating layers 42, the energy density of the anode sheet 4 is further improved.
Specifically, two opposite side walls of the anode current collecting layer 41 are both provided with an anode empty foil area 43 and an anode coating area 44, and the anode empty foil area 43 and the anode coating area 44 located on the same side are sequentially arranged along the length direction of the anode current collecting layer 41. Anodic coating zone 44 is for coating anodic coating layer 42. The anode empty foil area 43 is fixedly connected with an anode lug 45, and the anode lug 45 is fixedly connected with a lug glue 26.
Preferably, in one embodiment of the present application, the anode coating of the anode coating layer 42 may be an artificial graphite slurry.
Preferably, in one embodiment of the present application, the anode current collector layer 41 may be a copper layer, which may have a thickness of 6 um.
Referring to fig. 1, 4 and 5, in particular, the cathode sheet 2 includes a cathode current collector layer 21 and two cathode coating layers 22, and the two cathode coating layers 22 are respectively applied to opposite sides of the cathode current collector layer 21. With two cathode coating layers 22, the energy density of the cathode sheet 2 is further improved.
Specifically, the cathode collector layer 21 is provided with a cathode empty foil area 23 and a cathode coating area 24 on two opposite side walls, and the cathode empty foil area 23 and the cathode coating area 24 located on the same side are sequentially arranged along the length direction of the cathode collector layer 21. The cathode coating zone 24 is for coating the cathode coating layer 22. The cathode empty foil area 23 is fixedly connected with a cathode tab 25, and the cathode tab 25 is also fixedly connected with a tab glue 26.
Preferably, in one embodiment of the present application, the cathode coating of the cathode coating layer 22 may be a lithium cobaltate slurry.
Preferably, in one embodiment of the present application, the cathode current collector layer 21 may be an aluminum layer, and the thickness of the aluminum layer may be 10 um.
The side surface area of the anode coating layer 42 is larger than the side surface area of the cathode coating layer 22, and the two anode sheets 4 are respectively overlapped on the two opposite sides of the cathode sheet 2, so that the cathode coating layer 22 is completely attached to the two anode coating layers 42.
When the flexible lithium ion battery needs to be charged, lithium ions transferred by the cathode sheet 2 can be completely received by the anode sheet 4, so that the phenomenon of lithium separation is avoided.
Referring to fig. 1, 2 and 4, the side area of the first separator 31 is larger than the side area of the anode coating layer 42, and further the side area of the first separator 31 is larger than the side area of the cathode coating layer 22, so as to prevent the flexible lithium ion battery from contacting and short-circuiting due to the displacement of the cathode sheet 2 and the anode sheet 4 in the later use process.
Referring to fig. 8, preferably, in an embodiment of the present application, the number of the basic battery cells 1 is not less than one, and not less than one basic battery cells 1 are sequentially stacked to increase the energy density of the flexible lithium ion battery.
Wherein, an insulating film 5 is arranged between adjacent basic battery units 1, and the insulating film 5 is used for preventing short circuit between two adjacent basic battery units 1.
Referring to fig. 1, 6 and 7, in particular, the flexible lithium ion battery further includes a packaging bag 6, and a containing cavity 64 for containing the basic battery unit 1 and a seal 65 for later packaging are provided in the packaging bag 6. By means of the accommodating cavity 64, the packaging bag 6 can accommodate the basic battery unit 1, and the later-stage worker seals the opening 65, so that the packaging bag 6 can accommodate the basic battery unit 1 in a sealed manner.
Specifically, the packaging bag 6 is provided with a polypropylene layer 61, a metal layer 62, and a nylon layer 63 in this order from the inside toward the outside. Preferably, in one embodiment of the present application, the metal layer 62 may be an aluminum layer and may also be a stainless steel layer.
Specifically, the packaging bag 6 is further provided with a first adhesive layer 8, the first adhesive layer 8 is located on one side, facing the basic battery unit 1, of the packaging bag 6, and the first adhesive layer 8 is used for adhering and fixing the basic battery unit 1 and the inner side wall of the packaging bag 6.
At the in-process of assembly flexible lithium ion battery, heat the pressurization to basic battery unit 1 and wrapping bag 6, first adhesive linkage 8 melts and fuses each other, thereby can finalize the design to flexible lithium ion battery in advance and strengthen structural stability, prevents that flexible lithium ion battery later stage shape from kick-backing.
Preferably, in one embodiment of the present application, the thickness of the first adhesive layer 8 located on the packaging bag 6 is less than or equal to 20 um.
Preferably, in one embodiment of the present application, the thickness of the first adhesive layer 8 located at the packing bag 6 may be 5 um.
When the flexible lithium ion battery needs to be assembled, a worker places a basic battery unit 1 which is prefabricated in advance in the accommodating cavity 64, encapsulates a part of the area of the seal 65, and then carries out hot pressing and shape fixing on the semi-finished flexible lithium ion battery by using a hot pressing die, can be pressed into any shape, then dries and injects the flexible lithium ion battery, and finally completely encapsulates the packaging bag 6, thereby completing the assembly of the flexible lithium ion battery.
Referring to fig. 1, in particular, the flexible lithium ion battery further includes a second diaphragm mechanism 7. Specifically, the second diaphragm mechanism 7 includes two second diaphragms 71, the two second diaphragms 71 are respectively disposed on opposite sides of the basic battery unit 1, and the second diaphragms 71 are located between the basic battery unit 1 and the packaging film, and the second diaphragms 71 are used to bond the basic battery unit 1 and the packaging bag 6.
Referring to fig. 1, in particular, the second adhesive layer 9 is disposed on two opposite sides of the first diaphragm 31 and two opposite sides of the second diaphragm 71.
Preferably, in one embodiment of the present application, the sum of the thicknesses of the first separator 31 and all the second adhesive layers 9 disposed at opposite sides thereof is 20um or less.
Preferably, in one embodiment of the present application, the sum of the thicknesses of the second membrane 71 and all the second adhesive layers 9 disposed at opposite sides thereof is ≦ 20 um.
At assembly flexible lithium ion battery's in-process, the staff need utilize hot pressing die to carry out hot briquetting to semi-manufactured goods flexible lithium ion battery, and then first adhesive linkage 8 and second adhesive linkage 9 all are heated the melting, utilize first adhesive linkage 8, it is fixed to make basic cell 1 and the inseparable bonding of packaging film, utilize second adhesive linkage 9, make negative pole piece 2, it is fixed to closely bond between positive pole piece 4 and the diaphragm, and then the deformation effect of flexible lithium ion battery later stage in the use has been improved.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (10)
1. A flexible lithium ion battery, comprising: the basic battery unit (1) comprises a cathode sheet (2), a first diaphragm mechanism (3) and two anode sheets (4), wherein the two anode sheets (4) are respectively arranged on two opposite sides of the cathode sheet (2) in an overlapping mode, the first diaphragm mechanism (3) is arranged between the anode sheets (4) and the cathode sheet (2), and the first diaphragm mechanism (3) is used for separating the anode sheets (4) from the cathode sheet (2).
2. The flexible lithium ion battery of claim 1, wherein: the anode sheet (4) comprises an anode current collecting layer (41) and two anode coating layers (42), wherein the two anode coating layers (42) are respectively coated on two opposite sides of the anode current collecting layer (41).
3. The flexible lithium ion battery of claim 2, wherein: the cathode sheet (2) comprises a cathode current collecting layer (21) and two cathode coating layers (22), wherein the two cathode coating layers (22) are coated on two opposite sides of the cathode current collecting layer (21) respectively.
4. The flexible lithium ion battery of claim 3, wherein: the side surface area of the anode coating layer (42) is larger than the side surface area of the cathode coating layer (22).
5. The flexible lithium ion battery of claim 4, wherein: the first diaphragm mechanism (3) comprises two first diaphragms (31), the two first diaphragms (31) are respectively superposed on two opposite sides of the cathode sheet (2), and the side areas of the first diaphragms (31) are larger than that of the anode coating layer (42).
6. The flexible lithium ion battery of any of claims 1-5, wherein: the number of the basic battery units (1) is not less than one, and the not less than one basic battery units (1) are sequentially overlapped.
7. The flexible lithium ion battery of claim 6, wherein: an insulating film (5) is arranged between the adjacent basic battery units (1), and the insulating film (5) is used for preventing short circuit between the adjacent two basic battery units (1).
8. The flexible lithium ion battery according to claim 7, further comprising a packaging bag (6), wherein the packaging bag (6) is used for accommodating and packaging the basic battery unit (1), the packaging bag (6) is provided with a first adhesive layer (8), and the first adhesive layer (8) is used for adhering and fixing the basic battery unit (1) and the packaging bag (6).
9. The flexible lithium ion battery according to claim 8, further comprising a second separator means (7), wherein the second separator means (7) comprises two second separators (71), wherein the two second separators (71) are respectively disposed on two opposite sides of the basic battery cell (1), and wherein the second separators (71) are used for bonding the basic battery cell (1) and the packaging bag (6).
10. The flexible lithium ion battery according to claim 9, characterized in that the first separator (31) and the second separator (71) are each provided with a second adhesive layer (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220468598.7U CN217507426U (en) | 2022-03-04 | 2022-03-04 | Flexible lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220468598.7U CN217507426U (en) | 2022-03-04 | 2022-03-04 | Flexible lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217507426U true CN217507426U (en) | 2022-09-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220468598.7U Active CN217507426U (en) | 2022-03-04 | 2022-03-04 | Flexible lithium ion battery |
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| Country | Link |
|---|---|
| CN (1) | CN217507426U (en) |
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2022
- 2022-03-04 CN CN202220468598.7U patent/CN217507426U/en active Active
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