CN112786833A - Reference electrode, three-electrode battery and preparation method thereof - Google Patents
Reference electrode, three-electrode battery and preparation method thereof Download PDFInfo
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- CN112786833A CN112786833A CN202110119459.3A CN202110119459A CN112786833A CN 112786833 A CN112786833 A CN 112786833A CN 202110119459 A CN202110119459 A CN 202110119459A CN 112786833 A CN112786833 A CN 112786833A
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- 239000003292 glue Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 10
- 229910052744 lithium Inorganic materials 0.000 claims description 33
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
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- 229920001778 nylon Polymers 0.000 claims description 4
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- OPHUWKNKFYBPDR-UHFFFAOYSA-N copper lithium Chemical compound [Li].[Cu] OPHUWKNKFYBPDR-UHFFFAOYSA-N 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
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Classifications
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a reference electrode, a three-electrode battery and a preparation method thereof, wherein the reference electrode comprises a tab, tab glue, a lead area and a connecting area; the tab is clamped in the tab glue, and at least one end of the tab is exposed out of the tab glue; the wire area comprises a first insulating layer and a wire, and the wire is clamped in the first insulating layer; one end of the wire is electrically connected with one end of the tab; the connecting end of the lead and the tab is arranged in the connecting area; the outer surface of the connection region is coated with a second insulating layer. Compared with the conventional reference electrode formed by integrally forming the lug and the wire with the same material, the reference electrode has the advantages that the structural design is more easily adapted to the assembly of three electrodes, when the inside of the battery cell needs to be monitored simultaneously at multiple parts, the reference electrode can penetrate into each position of the battery cell in a wire-adding mode and is led out from the same lug to manufacture an integrated interface, and the problem that the simultaneous monitoring of the multiple parts inside the battery cell cannot be realized at present is solved.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a reference electrode, a three-electrode battery and a preparation method thereof.
Background
The lithium ion secondary battery consists of an anode, a cathode, a diaphragm, electrolyte and a packaging material, wherein the anode and the cathode are working electrodes, and the working principle is that redox reaction is carried out to release and embed lithium ions. In the prior art, a reference electrode is introduced to manufacture a three-electrode battery, so that the real-time change of the voltage of the anode and the voltage of the cathode can be conveniently and rapidly monitored, and the state change of the anode and the cathode during charging and discharging can be respectively analyzed.
Whereas lithium ion batteries typically employ metallic lithium as a reference electrode. The chinese patent application CN102044699A provides the most common method for manufacturing three electrodes, but it adopts rolling method to fix the lithium sheet on the metal negative electrode, and its contact strength is insufficient and internal resistance is large, which results in test deviation. The Chinese patent CN201904414U uses metal sheet lithium as a reference electrode, and internal short circuit is avoided by membrane wrapping, so that the preparation of three electrodes in a laboratory is simplified, but the storage and use of the metal lithium sheet have strict requirements on the environment, and the lithium sheet affects the working electrode. Chinese patent CN211238420U uses the copper wire wrapped by the diaphragm as the reference electrode, which avoids the safety problem caused by lithium metal, but the copper wire needs to be plated with lithium, which will consume lithium in the monitoring area and thus cause the monitoring data deviation in the area. Chinese patent CN211088434U provides a reference electrode tab that can be used for assembling three electrodes with an electric core, but the tab still uses a lithium metal sheet as the reference electrode, and has the problem of harsh requirements on safety and assembly environment. Chinese patent application CN106785068A provides a copper mesh covered lithium metal sheet as a reference electrode, and this connection method relying on contact only leads to an increase in contact resistance, resulting in abnormal testing. Chinese patent application CN107026282A provides a three-electrode in the shape of a conical flask, which cannot be applied to large batteries and square batteries due to the size problem, and in addition, different regions in the whole system of a lithium battery have different states during charging and discharging, and the polarization degrees of the regions are different, and if multiple parts are monitored simultaneously, there is a certain difficulty. In addition, the chinese patent CN211858829U also provides a reference electrode and a three-electrode battery, the upper part of the tab glue of the reference electrode is copper-plated with a nickel layer, and the lower part is a copper-plated lithium layer, the three-electrode preparation by the structure is simple and convenient, but the structure can not realize voltage monitoring at multiple positions; while this patent provides a protective coating for a lithium-plated layer to prevent oxidation of lithium, removal of the protective coating is a difficult problem and can easily damage the lithium-plated layer.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
One of the objects of the present invention is: the utility model provides a reference electrode, it is loaded down with trivial details to solve three electrodes of present reference electrode equipment, and can not realize the inside many parts of electric core problem of control simultaneously.
In order to achieve the purpose, the invention adopts the following technical scheme:
a reference electrode, comprising:
a tab;
gluing a tab; the tab is clamped in the tab glue, and at least one end of the tab is exposed out of the tab glue;
the wire area comprises a first insulating layer and at least one wire, and the wires are clamped in the first insulating layer; one end of the lead is electrically connected with one end of the tab;
the connecting end of the lead and the tab is arranged in the connecting area; the outer surface of the connection region is coated with a second insulating layer.
The reference electrode provided by the invention separates a lead area from a tab area, the tab is not integrally formed with the lead, the lead is taken as a reference electrode lead-in end and extends into the space between a positive electrode and a negative electrode, so that a three-electrode battery is formed, and the tab is electrically connected with the lead through a connecting area so as to lead out the reference electrode. Compared with the conventional reference electrode formed by integrally forming the lug and the wire with the same material, the reference electrode is more easily adapted to the assembly of three electrodes, and when the inside of the battery cell needs to be monitored simultaneously in multiple parts, the reference electrode can penetrate into each position of the battery cell in a mode of increasing the wire and is led out from the same lug to manufacture an integrated interface, so that the problem that the simultaneous monitoring of the multiple parts inside the battery cell cannot be realized at present is solved.
Preferably, the reference electrode further comprises a support body arranged at the bottom of the reference electrode and used for supporting the lead area of the reference electrode. The conventional reference electrode is made of a softer material, and the support is similar to a support, so that the strength of the reference electrode can be enhanced, the reference electrode can be smoothly placed in the battery cell, and particularly when three electrodes of a charged battery cell are prepared, the reference electrode provided by the invention can solve the problem that the reference electrode cannot penetrate into the battery cell because the material of the reference electrode is softer.
Preferably, the lead area is provided with a plurality of leads, and the tabs are provided with flexible circuits; one end of each of the plurality of leads is connected with the flexible circuit of the tab one by one. A plurality of wire is located the different positions of electric core respectively, and every wire all is connected with flexible line one by one for the voltage condition of each position of electric core all can be detected.
Preferably, a plurality of the wires are arranged in parallel in the wire area or form a grid type arrangement.
Preferably, the wire is lithium metal and/or copper plated with lithium. The lithium metal is a lithium metal wire or a lithium metal sheet, the diameter of the lithium metal wire is 3-100 mu m, and the thickness of the lithium metal sheet is 3-120 mu m; the copper wire in the copper lithium plating is made of copper with the purity of more than 99.99%, the diameter of the copper wire is 10-100 mu m, and the thickness of a lithium plating layer in the copper lithium plating is 3-100 mu m.
Preferably, the first insulating layer is made of at least one of PP, PE, PI, nylon, PET, and non-woven fabric; the second insulating layer is made of at least one of PP, PE and PI.
Preferably, the first insulating layer is provided with at least two layers which are respectively arranged on the upper surface and the lower surface of the lead and used for clamping the lead therein through hot melting compounding; the thickness of the first insulating layer is 3-50 μm, and the porosity of the first insulating layer is 10-70%.
Preferably, the wire region further includes an isolation layer covering an outer surface of the first insulating layer.
It is a second object of the present invention to provide a three-electrode battery comprising a positive electrode, a separator, a negative electrode and a reference electrode, wherein the reference electrode is any one of the reference electrodes described above.
The invention also aims to provide a preparation method of the three-electrode battery, which comprises the following steps:
s1, inserting a reference electrode at a position where the battery core needs to be monitored, wherein the reference electrode is the reference electrode in any one of the above;
and S2, packaging the battery cell, wherein at least part of the tab of the reference electrode is exposed outside the battery cell, and the tab glue of the reference electrode is positioned in the packaging area, so as to obtain the three-electrode battery.
Compared with the prior art, the invention has the beneficial effects that:
1) the reference electrode provided by the invention separates a lead area from a tab area, the tab is not integrally formed with the lead, the lead is taken as a reference electrode lead-in end and extends into the space between a positive electrode and a negative electrode, so that a three-electrode battery is formed, and the tab is electrically connected with the lead through a connecting area so as to lead out the reference electrode. Compared with the conventional reference electrode formed by integrally forming the lug and the wire with the same material, the reference electrode is more easily adapted to the assembly of three electrodes, and when the inside of the battery cell needs to be monitored simultaneously in multiple parts, the reference electrode can penetrate into each position of the battery cell in a mode of increasing the wire and is led out from the same lug to manufacture an integrated interface, so that the problem that the simultaneous monitoring of the multiple parts inside the battery cell cannot be realized at present is solved.
2) The reference electrode provided by the invention can be cut to meet the size requirements of different battery cells, can be manufactured in batches, and can be assembled into a three-electrode by being cut according to the size of the battery cell. In addition, the shape of the interface can be adjusted to be used for batteries with various shapes such as square, round or soft bags.
3) The reference provided by the invention can be used for loading a battery when the battery core is assembled, and can also be used for assembling a three-electrode by disassembling and then assembling after the battery core is invalid, namely the reference can be used for assembling a three-electrode by using an electrified battery core.
Drawings
FIG. 1 is a schematic view of the structure of a reference electrode in example 1 of the present invention.
Fig. 2 is a side view of a wire guide area of the present invention.
FIG. 3 is a schematic view showing the structure of a reference electrode in example 2 of the present invention.
FIG. 4 is a schematic view of the structure of a reference electrode in example 3 of the present invention.
FIG. 5 is a schematic view of the structure of a reference electrode in example 4 of the present invention.
In the figure: 1-a tab; 2, pole lug glue; 3-a conductor area; 31-a wire; 32-a first insulating layer; 33-a separation layer; a 4-joining region; 5-a support body.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
Example 1
As shown in fig. 1-2, a reference electrode comprises a tab 1, a tab glue 2, a lead area 3 and a connection area 4; the tab 1 is clamped in the tab glue 2, and at least one end of the tab 1 is exposed out of the tab glue 2; the wire region 3 includes a first insulating layer 32 and a wire 31, the wire 31 is clamped in the first insulating layer 32; one end of the wire 31 is electrically connected with one end of the tab 1; the connection ends of the wires 31 and the tabs 1 are arranged in the connection area 4; the outer surface of the connection region 4 is coated with a second insulating layer. The end of the wire 31 electrically connected with the tab 1 can be the end of the tab 1 exposed outside the tab glue 2, or can be the end arranged in the tab glue 2, but it should be ensured that the other end of the tab 1 is exposed outside the tab glue 2, if the wire 31 is connected with the end of the tab arranged in the tab glue 2, the tab 1 is connected with the wire 31 and then clamped in the tab glue, the strength of the connection is higher, and the wire is effectively prevented from falling off. In addition, the lead 31 and the tab 1 can be electrically connected by fusion welding, ultrasonic welding, etc., and then the outer surface of the lead is covered with a second insulating layer, which can also be covered by an upper layer and a lower layer, wherein the second insulating layer is made of at least one of PP, PE and PI.
Specifically, the tab 1 can be any one of copper, copper nickel plating, nickel or aluminum, is square, has a thickness of 10 to 300 μm, and can also be cylindrical, and has a diameter of 1 to 10 μm. The tab 1 is clamped in the tab glue 2, two layers of tab glue 2 can be adopted to clamp the tab 1 in the tab glue 2 through thermal compounding, the material of the tab glue 2 can be any one of PP, PI, PE, PET and Nylon, and the thickness of the tab glue 2 is 0.03-0.50 mm; of course, the tab glue 2 can also be adjusted to be a ring shape according to the shape of the tab 1, and the thickness is 0.05-10 mm.
Further, the wire 31 is lithium metal and/or copper plated with lithium. Wherein the lithium metal is a lithium metal wire or a lithium metal sheet, the diameter of the lithium metal wire is 3-100 μm, the thickness of the lithium metal sheet is 3-120 μm, and the width of the lithium metal sheet is 1-10 mm; the copper wire in the copper lithium plating is made of copper with the purity of more than 99.99 percent, the diameter is 10-100 mu m, and the thickness of a lithium plating layer in the copper lithium plating is 3-100 mu m.
Further, the material of the first insulating layer 32 is at least one of PP, PE, PI, nylon, PET, and non-woven fabric. The first insulating layer 32 is provided with at least two layers, which are respectively arranged on the upper and lower surfaces of the wire, and the wire 31 is clamped therein by hot melt compounding; the thickness of the first insulating layer 32 is 3 to 50 μm, and the porosity of the first insulating layer 32 is 10 to 70%.
Further, the wire region 3 further includes an isolation layer 33, and the isolation layer 33 covers an outer surface of the first insulating layer 32. The arrangement of the isolation layer 33 on the surface of the first insulation layer 32 can further isolate the wire 31 from air, so as to avoid oxidation of the wire 31, and the isolation layer 33 can be made of PET or PI. The isolation layer 33 is mainly used for protecting the reference electrode when three electrodes are assembled, and the isolation layer 33 is torn off and then used when the three electrodes are assembled.
Example 2
As shown in fig. 3, the difference from example 1 is the arrangement of the reference electrode lead region. The lead area 3 of the present embodiment is provided with a plurality of leads 31, the plurality of leads 31 are arranged in parallel in the lead area 3, and the tab 1 is provided with a flexible circuit; one end of each of the plurality of wires 31 is connected to the flexible circuit of the tab 1 one by one. The outside of the tab 1 forms an integrated interface (similar to a plug of a flexible circuit board), so that simultaneous monitoring of multiple positions is realized. As shown in fig. 3, the reference electrode can be cut at the bottom and left and right.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
As shown in fig. 4, the difference from example 1 is the arrangement of the reference electrode lead region. The lead area 3 of the present embodiment is provided with a plurality of leads 31, the plurality of leads 31 form a grid-type arrangement in the lead area 3, and the tab 1 is provided with a flexible circuit; one end of each of the plurality of wires 31 is connected to the flexible circuit of the tab 1 one by one. The grid-type arrangement can be that the wires 31 are arranged into a grid, a plurality of wires 31 are arranged at an angle of 90 degrees, and then the wires 31 are guided to one end through the lead wires and are connected with the flexible circuits on the lugs 1 one by one, so that a grid-type reference electrode capable of being cut is formed, and the cutting position can be shown in fig. 4. As for the interface above the tab 1, a conventional interface is used, and no limitation is made here.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
As shown in fig. 5, the difference from example 1 is the arrangement of the reference electrode. The reference electrode of this embodiment further comprises a support body 5 disposed at the bottom of the reference electrode for supporting the lead region 3 of the reference electrode. Because the conventional reference electrode is made of a softer material, the support body 5 is similar to a support, so that the strength of the reference electrode can be enhanced, the reference electrode can be smoothly placed in the battery cell, and particularly when three electrodes of a charged battery cell are prepared, the reference electrode provided by the invention can solve the problem that the reference electrode cannot penetrate into the battery cell because the material of the reference electrode is softer.
The rest is the same as embodiment 1, and the description is omitted here.
Example 5
A three-electrode battery comprises a positive electrode, a diaphragm, a negative electrode and a reference electrode, wherein the reference electrode is the reference electrode in any one of embodiments 1-4. The arrangement of the positive electrode, separator and negative electrode can be seen in the prior art and will not be described in detail here.
Example 6
A preparation method of a three-electrode battery comprises the following steps:
s1, winding or laminating the positive electrode, the diaphragm and the negative electrode to form a battery cell, and then inserting a reference electrode into a position, needing to be monitored, of the battery cell, wherein the reference electrode is placed between the positive electrode and the negative electrode, and the reference electrode is the reference electrode in any one of embodiments 1-4;
and S2, packaging the battery cell, wherein the tab 1 of the reference electrode is at least partially exposed outside the battery cell, and the tab glue 2 of the reference electrode is positioned in the packaging area, so as to obtain the three-electrode battery.
The preparation method of the three-electrode battery is that the battery core is assembled before being uncharged, if the three-electrode is manufactured by using the charged battery core, the battery is completely discharged to 0% soc, then a battery packaging opening is disassembled (if the winding battery core of the soft package battery is provided with an opening at the top or the bottom, and any side of the laminated battery core can be provided with the opening), then the anode and the cathode of the battery core are separated by using an insulator at the position needing to be monitored, the reference electrode is placed between the anode and the cathode (if the isolating layer is arranged, the isolating layer needs to be torn off firstly), wherein the tab 1 of the reference electrode is at least partially exposed outside the aluminum plastic film, the tab glue 2 of the reference electrode is positioned between two layers of aluminum plastic films in a packaging area, and finally the sealing head is used for packaging at the position of the tab glue 2, so that the subsequent detection of the three-
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope 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.
Claims (10)
1. A reference electrode, comprising:
a tab (1);
a tab glue (2); the tab (1) is clamped in the tab glue (2), and at least one end of the tab (1) is exposed out of the tab glue (2);
a wire region (3) comprising a first insulating layer (32) and at least one wire (31), the wires (31) each being clamped in the first insulating layer (32); one end of the lead (31) is electrically connected with one end of the tab (1);
the connecting end of the lead (31) and the tab (1) is arranged in the connecting area (4); the outer surface of the connection region (4) is coated with a second insulating layer.
2. The reference electrode according to claim 1, further comprising a support (5) disposed at the bottom of the reference electrode for supporting the lead region (3) of the reference electrode.
3. The reference electrode according to claim 1, characterized in that the lead area (3) is provided with several leads (31), the tab (1) being provided with a flexible circuit; one end of each of the plurality of leads (31) is connected with the flexible circuit of the tab (1) one by one.
4. The reference electrode according to claim 3, characterized in that several of said wires (31) are arranged side by side or in a grid-type arrangement within said wire area (3).
5. The reference electrode according to any of claims 1 to 4, wherein the wire (31) is lithium metal and/or copper plated with lithium.
6. The reference electrode according to any one of claims 1 to 4, wherein the first insulating layer (32) is made of at least one material selected from PP, PE, PI, nylon, PET, and non-woven fabric; the second insulating layer is made of at least one of PP, PE and PI.
7. The reference electrode according to claim 6, wherein the first insulating layer (32) is provided with at least two layers, respectively provided on upper and lower surfaces of the lead (31), in which the lead (31) is clamped by thermal fusion bonding; the thickness of the first insulating layer (32) is 3 to 50 μm, and the porosity of the first insulating layer (32) is 10 to 70%.
8. The reference electrode according to claim 7, wherein the lead region (4) further comprises a separation layer (33), the separation layer (33) covering an outer surface of the first insulating layer (32).
9. A three-electrode battery comprising a positive electrode, a separator, a negative electrode and a reference electrode, wherein the reference electrode is the reference electrode according to any one of claims 1 to 8.
10. A preparation method of a three-electrode battery is characterized by comprising the following steps:
s1, inserting a reference electrode at a position where the battery core needs to be monitored, wherein the reference electrode is the reference electrode in any one of claims 1-8;
and S2, packaging the battery cell, wherein at least part of the tab (1) of the reference electrode is exposed outside the battery cell, and the tab glue (2) of the reference electrode is positioned in the packaging area, so that the three-electrode battery is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110119459.3A CN112786833A (en) | 2021-01-28 | 2021-01-28 | Reference electrode, three-electrode battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110119459.3A CN112786833A (en) | 2021-01-28 | 2021-01-28 | Reference electrode, three-electrode battery and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112786833A true CN112786833A (en) | 2021-05-11 |
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Application publication date: 20210511 |