CN219677319U - Three-electrode battery - Google Patents
Three-electrode battery Download PDFInfo
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- CN219677319U CN219677319U CN202223506406.6U CN202223506406U CN219677319U CN 219677319 U CN219677319 U CN 219677319U CN 202223506406 U CN202223506406 U CN 202223506406U CN 219677319 U CN219677319 U CN 219677319U
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- 238000003475 lamination Methods 0.000 claims abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 17
- 229910052744 lithium Inorganic materials 0.000 claims description 17
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 9
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 9
- 210000004027 cell Anatomy 0.000 description 32
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- 230000002687 intercalation Effects 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- 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 the technical field of lithium ion batteries, and discloses a three-electrode battery, which comprises a battery core; the cell comprises a positive plate, a negative plate, a diaphragm and a reference electrode; the positive plate, the negative plate and the diaphragm are arranged in a lamination way; the positive plate is provided with a first notch, the reference electrode is embedded in the first notch, and the reference electrode and the positive plate are arranged on the same layer; the reference electrode and the positive plate are clamped between two adjacent diaphragms corresponding to the positive plate; or the negative plate is provided with a second notch, the reference electrode is embedded in the second notch, and the reference electrode and the negative plate are arranged on the same layer; the reference electrode and the negative electrode plate are clamped between two adjacent diaphragms corresponding to the negative electrode plate. According to the utility model, the reference electrode can be conveniently arranged in the cell structure, the arrangement of the reference electrode does not excessively influence the battery performance of the three-electrode battery, and the potential information of the working electrode can be accurately acquired based on the reference electrode.
Description
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a three-electrode battery.
Background
With the development and maturity of lithium ion battery technology, higher requirements are put on the performance of lithium ion batteries, such as fast charging, low-temperature charging, and the like. However, the performance of these lithium ion batteries is closely related to the lithium precipitation side reaction on the negative electrode surface. The lithium-ion battery has the advantages that the lithium-ion battery has a negative electrode surface lithium-precipitation side reaction closely related to the lithium intercalation potential of the negative electrode, so that the lithium intercalation potential of the negative electrode is accurately monitored to be a common requirement of the lithium battery industry. In the prior art, a third electrode which does not participate in an electrochemical reaction process is mainly introduced into a battery system to serve as an auxiliary electrode so as to monitor the potential of a negative electrode of the lithium ion battery, and thus the potential change of the positive electrode and the negative electrode of the lithium ion battery relative to a reference electrode in the charge and discharge processes is obtained.
In existing three-electrode batteries, a reference electrode is typically mounted between the positive and negative electrodes, or in the gap between the cell body and the battery housing. The research shows that under the condition that the reference electrode is assembled between the positive electrode and the negative electrode, the existence of the reference electrode directly leads to the local deformation of the electrode pole piece under the external rigid clamping, thereby causing potential safety hazard; however, when the reference electrode is assembled in the gap between the cell body and the cell housing, as the battery magnification increases, the working electrode has potential change hysteresis and potential change insensitivity due to the larger liquid phase transmission polarization between the working electrode and the reference electrode, which results in the influence on the performance of the battery.
Disclosure of Invention
The utility model provides a three-electrode battery, which is used for solving the problem that the arrangement of a reference electrode is difficult to carry out on the premise of not affecting the battery performance of the three-electrode battery.
The present utility model provides a three-electrode battery comprising: a battery cell; the battery cell comprises a positive plate, a negative plate, a diaphragm and a reference electrode;
the positive plate, the negative plate and the diaphragm are arranged in a lamination way; along the thickness direction of the battery cell, the positive electrode plates and the negative electrode plates are alternately arranged, and the diaphragms are arranged between the adjacent positive electrode plates and negative electrode plates;
the positive plate is provided with a first notch, the reference electrode is embedded in the first notch, and the reference electrode and the positive plate are arranged on the same layer; the reference electrode and the positive electrode sheet are clamped between two adjacent diaphragms corresponding to the positive electrode sheet;
or the negative plate is provided with a second notch, the reference electrode is embedded in the second notch, and the reference electrode and the negative plate are arranged on the same layer; the reference electrode and the negative electrode sheet are clamped between two adjacent diaphragms corresponding to the negative electrode sheet.
According to the three-electrode battery provided by the utility model, the reference electrode is strip-shaped;
under the condition that the reference electrode and the positive electrode sheet are arranged in the same layer, the first notch is arranged in an extending mode along the extending direction of the reference electrode, and a first gap is formed between the edge of the first notch and the edge of the reference electrode;
under the condition that the reference electrode and the negative electrode sheet are arranged on the same layer, the second notch extends along the extending direction of the reference electrode, and a second gap is formed between the edge of the second notch and the edge of the reference electrode.
According to the three-electrode battery provided by the utility model, under the condition that the positive plate is provided with the first notch, the ratio of the opening area of the first notch to the surface area of the positive plate is smaller than K; in the case that the negative electrode sheet is provided with the second notch, the ratio of the opening area of the second notch to the surface area of the negative electrode sheet is smaller than K; wherein the value of K is 1-5%.
According to the three-electrode battery provided by the utility model, the thickness of the reference electrode is smaller than or equal to the thickness of the positive plate; and/or the thickness of the reference electrode is smaller than or equal to the thickness of the negative plate.
According to the three-electrode battery provided by the utility model, the reference electrode comprises a metal lithium foil.
According to the three-electrode battery provided by the utility model, the reference electrode comprises a first conductive layer and a second conductive layer;
the first conductive layer and the second conductive layer are stacked, and one of the first conductive layer and the second conductive layer is a metal lithium layer.
According to the three-electrode battery provided by the utility model, the reference electrode comprises a lithium iron phosphate electrode or a lithium titanate electrode.
According to the three-electrode battery provided by the utility model, the battery core comprises a plurality of positive electrode plates provided with the first notch; the vertical projections of the first notches on the plurality of positive plates are overlapped along the thickness direction of the battery cell;
or the battery cell comprises a plurality of negative electrode plates provided with the second notch; and along the thickness direction of the battery cell, the vertical projections of the second gaps on the plurality of negative plates coincide.
According to the three-electrode battery provided by the utility model, the three-electrode battery further comprises a tab assembly; the tab assembly comprises a positive tab, a negative tab and an auxiliary tab; the positive electrode tab is electrically connected with the positive electrode plate, the negative electrode tab is electrically connected with the negative electrode plate, and the auxiliary tab is electrically connected with the reference electrode;
the positive electrode tab comprises an aluminum tab, the negative electrode tab comprises a nickel tab, and the auxiliary tab comprises a nickel tab.
According to the three-electrode battery provided by the utility model, the positive electrode tab, the negative electrode tab and the auxiliary tab are arranged at the first end of the three-electrode battery;
or the positive electrode tab and the negative electrode tab are arranged at the first end of the three-electrode battery, the auxiliary tab is arranged at the second end of the three-electrode battery, and the first end and the second end of the three-electrode battery are oppositely arranged.
According to the three-electrode battery provided by the utility model, the positive electrode tab comprises an aluminum tab, the negative electrode tab comprises a nickel tab, and the auxiliary tab comprises a nickel tab.
According to the three-electrode battery provided by the utility model, the gap (the first gap or the second gap) is formed in the electrode plate (the positive electrode plate or the negative electrode plate) of the battery core, the gap space existing in the gap of the electrode plate can be used for distributing the reference electrode, and the reference electrode can be clamped and fixed through the diaphragms on the two sides of the electrode plate, so that the electrode plate and the reference electrode can be conveniently and insulatively arranged, the electrode plates at other layers can be prevented from being locally deformed under the action of the reference electrode in the process of clamping the battery core, and the distribution of the positions of the reference electrode can be ensured not to excessively influence the charge and discharge processes of the three-electrode battery by arranging the reference electrode at the gap.
Therefore, the reference electrode can be conveniently arranged in the cell structure, the arrangement of the reference electrode does not excessively influence the battery performance of the three-electrode battery, and the potential information of the working electrode can be accurately acquired based on the reference electrode.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a three-electrode battery cell according to the present utility model;
FIG. 2 is a schematic diagram of a battery cell of a three-electrode battery according to a second embodiment of the present utility model;
FIG. 3 is a third schematic diagram of the cell of the three-electrode battery according to the present utility model;
fig. 4 is a schematic diagram of a cell structure of a three-electrode battery according to the present utility model.
Reference numerals:
1. a battery cell; 11. a positive plate; 111. a first notch; 12. a negative electrode sheet; 121. a second notch; 13. a diaphragm; 14. a reference electrode;
21. a positive electrode tab; 22. a negative electrode tab; 23. auxiliary tab.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The three-electrode battery provided by the embodiment of the utility model is described in detail below with reference to fig. 1 to 4 through specific embodiments and application scenarios thereof.
As shown in fig. 1 to 4, the present embodiment provides a three-electrode battery including: a battery cell 1; cell 1 includes positive electrode sheet 11, negative electrode sheet 12, separator 13, and reference electrode 14.
The positive electrode sheet 11, the negative electrode sheet 12 and the separator 13 are arranged in a laminated manner; along the thickness direction of the battery cell 1, the positive electrode plates 11 and the negative electrode plates 12 are alternately arranged, and a diaphragm 13 is arranged between each two adjacent positive electrode plates 11 and negative electrode plates 12.
It can be understood that the battery cell 1 is based on the lamination arrangement of the positive electrode sheet 11, the negative electrode sheet 12 and the separator 13, and can be formed into a cube structure, and the arrangement structure of the battery cell 1 can be not only the negative electrode sheet 12-separator 13-positive electrode sheet 11-separator 13-negative electrode sheet 12- … -positive electrode sheet 11-separator 13-negative electrode sheet 12, but also the positive electrode sheet 11-separator 13-negative electrode sheet 12- … -positive electrode sheet 11-separator 13-negative electrode sheet 12, and can be the positive electrode sheet 11-separator 13-negative electrode sheet 12- … -positive electrode sheet 11-separator 13-negative electrode sheet 12-separator 13-positive electrode sheet 11, which is not particularly limited.
Wherein the positive electrode sheet 11 includes an aluminum foil layer and a positive electrode slurry layer, and both the first side and the second side of the aluminum foil layer are coated with the positive electrode slurry layer.
The negative electrode sheet 12 includes a copper foil layer and a negative electrode paste layer, and both the first side and the second side of the copper foil layer are coated with the negative electrode paste layer.
The separator 13 may be a polyolefin porous film, and the separator 13 serves to achieve insulation between the adjacent positive electrode sheet 11 and negative electrode sheet 12 and allow electrolyte ions in the three-electrode battery to permeate therethrough.
Further, as shown in fig. 1 and 2, the arrangement structure of the battery cell 1 of the present embodiment is a negative electrode sheet 12-a separator 13-a positive electrode sheet 11-a separator 13-a negative electrode sheet 12- … -a positive electrode sheet 11-a separator 13-a negative electrode sheet 12. The positive plate 11 of the embodiment is provided with a first notch 111, the reference electrode 14 is embedded in the first notch 111, and the reference electrode 14 and the positive plate 11 are arranged on the same layer; reference electrode 14 and positive electrode sheet 11 are sandwiched between two adjacent separators 13 corresponding to positive electrode sheet 11.
The opening end of the first notch 111 is disposed at the periphery of the positive electrode plate 11, and the first notch 111 extends toward the middle area of the positive electrode plate 11.
As shown in fig. 3 and 4, the arrangement structure of the battery cell 1 of the present embodiment is positive electrode sheet 11-separator 13-negative electrode sheet 12- … -positive electrode sheet 11-separator 13-negative electrode sheet 12-separator 13-positive electrode sheet 11. Wherein, the negative electrode plate 12 of the embodiment is provided with a second notch 121, the reference electrode 14 is embedded in the second notch 121, and the reference electrode 14 and the negative electrode plate 12 are arranged on the same layer; reference electrode 14 and negative electrode sheet 12 are sandwiched between two adjacent separators 13 corresponding to negative electrode sheet 12.
The opening end of the second notch 121 is disposed at the periphery of the negative electrode plate 12, and the second notch 121 extends toward the middle area of the negative electrode plate 12.
As can be seen from the above, in this embodiment, by providing the gap (the first gap 111 or the second gap 121) on the electrode plate (the positive electrode plate 11 or the negative electrode plate 12) of the electric core 1, the gap space existing at the gap of the electrode plate can be utilized to perform layout of the reference electrode 14, and the diaphragms 13 on two sides of the electrode plate can be used to clamp and fix the reference electrode 14, which is not only convenient for insulating the electrode plate and the reference electrode 14, but also can prevent the electrode plates on other layers from generating local deformation under the action of the reference electrode 14 in the process of clamping the electric core 1, and can ensure that layout of the positions of the reference electrode 14 does not excessively affect the charge-discharge process of the three-electrode battery by providing the reference electrode 14 at the gap.
Therefore, the reference electrode 14 can be conveniently arranged in the structure of the cell 1, the arrangement of the reference electrode 14 does not excessively influence the battery performance of the three-electrode battery, and the potential information of the working electrode can be accurately acquired based on the reference electrode 14.
It should be noted here that the positive electrode sheet provided with the first notch of the present embodiment may be provided with one sheet or may be provided with a plurality of sheets, which is not particularly limited.
Accordingly, the negative electrode sheet provided with the second notch of the present embodiment may be provided with one sheet or may be provided with a plurality of sheets, which is not particularly limited
In some embodiments, as shown in fig. 1 to 4, the reference electrode 14 of the present embodiment is in a strip shape, and this arrangement can reduce the area ratio of the reference electrode 14 relative to the electrode sheet (the positive electrode sheet 11 or the negative electrode sheet 12) disposed on the same layer, and can prevent the existence of the reference electrode 14 from affecting the charge-discharge process of the battery, so as to avoid the problem that local non-uniformity occurs in the electrochemical reaction inside the cell 1 as much as possible.
In some examples, where reference electrode 14 and positive electrode 11 are arranged in the same layer, first gap 111 is arranged extending along the direction of extension of reference electrode 14, and a first gap is formed between the edge of first gap 111 and the edge of reference electrode 14, so that reference electrode 14 and positive electrode 11 arranged in the same layer are arranged insulated.
As shown in fig. 1, the first notch 111 of the present embodiment may be disposed on a side edge of the positive electrode sheet 11, and the first notch 111 and the reference electrode 14 are disposed to extend along an extending direction of a bottom edge of the positive electrode sheet 11.
As shown in fig. 2, the first notch 111 of the present embodiment may be disposed at the bottom edge of the positive electrode sheet 11, and the first notch 111 and the reference electrode 14 are disposed together to extend along the extending direction of the side edge of the positive electrode sheet 11.
In some examples, where reference electrode 14 and negative electrode sheet 12 are arranged in the same layer, second gap 121 is arranged extending along the direction of extension of reference electrode 14, and a second gap is formed between the edge of second gap 121 and the edge of reference electrode 14, so that reference electrode 14 and negative electrode sheet 12 arranged in the same layer are arranged in an insulated manner.
As shown in fig. 3, the second notch 121 of the present embodiment may be disposed on a side edge of the negative electrode sheet 12, and the second notch 121 and the reference electrode 14 are disposed to extend along an extending direction of a bottom edge of the negative electrode sheet 12.
As shown in fig. 4, the second notch 121 of the present embodiment may be disposed at the bottom edge of the positive electrode sheet 11, and the second notch 121 and the reference electrode 14 are disposed together to extend along the extending direction of the side edge of the negative electrode sheet 12.
In some embodiments, since reference electrode 14 is embedded in first gap 111 or second gap 121, the area occupied by reference electrode 14 is close to the opening area of first gap 111 or second gap 121, and the opening area of first gap 111 or second gap 121 may be set in this embodiment, so as to prevent the charging and discharging processes of the battery from being affected by the existence of reference electrode 14.
In some examples, in the case where the positive electrode sheet 11 is provided with the first notch 111, the present embodiment may provide that the ratio of the opening area of the first notch 111 to the surface area of the positive electrode sheet 11 is smaller than K.
In some examples, in the case where the negative electrode sheet 12 is provided with the second notch 121, the present embodiment may provide that the ratio of the opening area of the second notch 121 to the surface area of the negative electrode sheet 12 is smaller than K.
Wherein, the value of K can be 1% -5%. Alternatively, the value of K is specifically 1%, 3% or 5%, which is not particularly limited.
In some embodiments, reference electrode 14 of the present embodiment has a thickness less than or equal to the thickness of positive electrode sheet 11; and/or the thickness of reference electrode 14 is less than or equal to the thickness of negative electrode sheet 12.
Therefore, when the reference electrode 14 and the positive electrode sheet 11 or the negative electrode sheet 12 are arranged on the same layer, the reference electrode 14 does not occupy the layer height, so that in the process of clamping the battery cell 1, the electrode sheets at other layers can be prevented from generating local deformation under the action of the reference electrode 14, the stability of the structure of the battery cell 1 can be ensured, and the battery performance of the three-electrode battery can be ensured.
In some embodiments, the structural form of the reference electrode 14 may be set as required to ensure the battery performance of the three-electrode battery, and the potential of the working electrode (positive electrode or negative electrode) of the three-electrode battery can be accurately detected based on the reference electrode 14 during the working process of the three-electrode battery.
In some examples, reference electrode 14 of the present embodiment may be a metallic lithium foil to ensure that reference electrode 14 does not occupy a high layer height, thereby advantageously preventing deformation of the associated electrode pad within cell 1 under the influence of reference electrode 14.
In some examples, reference electrode 14 of the present embodiment includes a first conductive layer and a second conductive layer; the first conductive layer and the second conductive layer are stacked, and one of the first conductive layer and the second conductive layer is a metal lithium layer.
Optionally, the first conductive layer is a metal lithium layer, and the second conductive layer is a metal layer capable of stably plating lithium. For example, the second conductive layer is a metallic silver layer, a metallic copper layer, or a metallic nickel layer.
Here, in this embodiment, by providing reference electrode 14 as a first conductive layer and a second conductive layer that are combined, not only the structural strength of reference electrode 14 but also the electrode performance of reference electrode 14 can be ensured, and also the preparation of reference electrode 14 can be facilitated.
In some examples, reference electrode 14 of the present embodiment may also be selected to be a lithium iron phosphate electrode or a lithium titanate electrode in order to ensure stability of reference electrode 14.
Of course, the reference electrode 14 of this embodiment may be made of a complex of lithium and copper, or a complex of lithium and nickel, which will not be described in detail.
In some embodiments, to facilitate the arrangement of positive electrode 11 and reference electrode 14, cell 1 of the present embodiment may be provided with a plurality of positive electrode 11 with first notch 111; the vertical projections of the first notches 111 on the plurality of positive plates 11 are overlapped along the thickness direction of the battery cell 1, so that the reference electrode 14 which is arranged in the same layer with each positive plate 11 is embedded at the same position.
In some embodiments, to facilitate the layout of negative electrode sheet 12 and reference electrode 14, cell 1 of the present embodiment may be provided with a plurality of negative electrode sheets 12 provided with second notches 121; the vertical projection of the second notches 121 on the plurality of negative electrode plates 12 coincides with each other along the thickness direction of the battery cell 1, so that the reference electrode 14 arranged in the same layer as each negative electrode plate 12 is embedded in the same position.
Based on the scheme of the embodiment, the three-electrode battery of the embodiment further comprises a tab assembly; the tab assembly comprises a positive tab 21, a negative tab 22 and an auxiliary tab 23; the positive electrode tab 21 is electrically connected with the positive electrode plate 11, the negative electrode tab 22 is electrically connected with the negative electrode plate 12, and the auxiliary electrode tab 23 is electrically connected with the reference electrode 14.
Alternatively, in this embodiment, the positive electrode tab 21 and the positive electrode sheet 11 may be welded together, or the positive electrode tab 21 and the positive electrode sheet 11 may be formed as a single piece.
In this embodiment, the negative electrode tab 22 and the negative electrode sheet 12 may be welded together, or the negative electrode tab 22 and the negative electrode sheet 12 may be integrally formed.
In this embodiment, auxiliary tab 23 may be welded to reference electrode 14, or auxiliary tab 23 may be welded to reference electrode 14.
Wherein, the positive electrode tab 21 includes an aluminum tab, the negative electrode tab 22 includes a nickel tab, and the auxiliary tab 23 includes a nickel tab.
In some embodiments, the positions of the positive electrode tab 21, the negative electrode tab 22, and the auxiliary tab 23 relative to the battery cell 1 may be adaptively arranged according to actual requirements.
In some examples, the positive electrode tab 21, the negative electrode tab 22 and the auxiliary tab 23 of the present embodiment are provided at the first end of the three-electrode battery, so as to realize that the positive electrode tab 21, the negative electrode tab 22 and the auxiliary tab 23 are arranged on the same side with respect to the battery cell 1.
In some examples, the positive electrode tab 21 and the negative electrode tab 22 of the present embodiment are disposed at a first end of the three-electrode battery, the auxiliary tab 23 is disposed at a second end of the three-electrode battery, and the first end and the second end of the three-electrode battery are disposed opposite to each other, so as to separate the positive electrode tab 21 and the negative electrode tab 22 from each other at opposite sides of the battery cell 1 with respect to the auxiliary tab 23.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; while the utility model has been described in detail with reference to the foregoing embodiments, it will be appreciated by those skilled in the art that variations may be made in the techniques described in the foregoing embodiments, or equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A three-electrode battery, comprising: a battery cell; the battery cell comprises a positive plate, a negative plate, a diaphragm and a reference electrode;
the positive plate, the negative plate and the diaphragm are arranged in a lamination way; along the thickness direction of the battery cell, the positive electrode plates and the negative electrode plates are alternately arranged, and the diaphragms are arranged between the adjacent positive electrode plates and negative electrode plates;
the positive plate is provided with a first notch, the reference electrode is embedded in the first notch, and the reference electrode and the positive plate are arranged on the same layer; the reference electrode and the positive electrode sheet are clamped between two adjacent diaphragms corresponding to the positive electrode sheet;
or the negative plate is provided with a second notch, the reference electrode is embedded in the second notch, and the reference electrode and the negative plate are arranged on the same layer; the reference electrode and the negative electrode sheet are clamped between two adjacent diaphragms corresponding to the negative electrode sheet.
2. The three electrode cell of claim 1, wherein the reference electrode is in the form of a strip;
under the condition that the reference electrode and the positive electrode sheet are arranged in the same layer, the first notch is arranged in an extending mode along the extending direction of the reference electrode, and a first gap is formed between the edge of the first notch and the edge of the reference electrode;
under the condition that the reference electrode and the negative electrode sheet are arranged on the same layer, the second notch extends along the extending direction of the reference electrode, and a second gap is formed between the edge of the second notch and the edge of the reference electrode.
3. The three-electrode battery according to claim 1, wherein in the case where the positive electrode sheet is provided with the first notch, a ratio of an opening area of the first notch to a surface area of the positive electrode sheet is smaller than K;
in the case that the negative electrode sheet is provided with the second notch, the ratio of the opening area of the second notch to the surface area of the negative electrode sheet is smaller than K;
wherein the value of K is 1-5%.
4. The three electrode battery of claim 1, wherein the reference electrode has a thickness less than or equal to the thickness of the positive plate; and/or the thickness of the reference electrode is smaller than or equal to the thickness of the negative plate.
5. The three electrode cell of claim 1, wherein the reference electrode comprises a metallic lithium foil.
6. The three electrode cell of claim 1, wherein the reference electrode comprises a first conductive layer and a second conductive layer;
the first conductive layer and the second conductive layer are stacked, and one of the first conductive layer and the second conductive layer is a metal lithium layer.
7. The three electrode battery of claim 1, wherein the reference electrode comprises a lithium iron phosphate electrode or a lithium titanate electrode.
8. The three electrode battery of any one of claims 1 to 7, wherein the cell comprises a plurality of the positive electrode sheets provided with the first notch; the vertical projections of the first notches on the plurality of positive plates are overlapped along the thickness direction of the battery cell;
or the battery cell comprises a plurality of negative electrode plates provided with the second notch; and along the thickness direction of the battery cell, the vertical projections of the second gaps on the plurality of negative plates coincide.
9. The three electrode battery of any one of claims 1 to 7, further comprising a tab assembly;
the tab assembly comprises a positive tab, a negative tab and an auxiliary tab; the positive electrode tab is electrically connected with the positive electrode plate, the negative electrode tab is electrically connected with the negative electrode plate, and the auxiliary tab is electrically connected with the reference electrode;
the positive electrode tab comprises an aluminum tab, the negative electrode tab comprises a nickel tab, and the auxiliary tab comprises a nickel tab.
10. The three electrode battery of claim 9, wherein the positive tab, the negative tab, and the auxiliary tab are disposed at a first end of the three electrode battery;
or the positive electrode tab and the negative electrode tab are arranged at the first end of the three-electrode battery, the auxiliary tab is arranged at the second end of the three-electrode battery, and the first end and the second end of the three-electrode battery are oppositely arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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