CN110661048A - Liquid battery efficiency detection device and detection method thereof - Google Patents
Liquid battery efficiency detection device and detection method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a liquid battery efficiency detection device and a detection method thereof, wherein the device comprises a negative electrode frame, a single battery frame and a positive electrode frame which are connected in sequence; a negative plate is arranged on one side, adjacent to the single-cell frame, of the negative frame, and the negative frame is provided with a negative lead-out screw rod in contact with the negative plate; after the negative electrode frame and the single battery frame are overlapped, the negative electrode frame and the single battery frame form a sealed electrolyte chamber; the monocell frame is provided with a liquid injection hole communicated with the sealed electrolyte cabin; one side of the positive electrode frame, which is adjacent to the single battery frame, is provided with a bipolar plate, and the positive electrode frame is provided with a positive electrode lead-out screw rod which is in contact with the bipolar plate. The liquid battery efficiency detection device can directly detect the charge and discharge efficiency of the liquid battery electrolyte, can be used for rapidly evaluating and judging the performance of the battery electrolyte and the performance of a battery polar plate, is simple, can be rapidly disassembled and cleaned, facilitates the replacement of the electrolyte and the polar plate, and greatly improves the detection efficiency.
Description
Technical Field
The invention relates to the technical field of electrochemical energy storage, in particular to a liquid battery efficiency detection device and a detection method thereof.
Background
The existing electrochemical energy storage technology mainly comprises a sodium-sulfur battery, a flow battery, a lead-acid battery, a lithium ion battery and the like. Achieving rapid verification of cell efficiency is an important step in cell development efforts.
Chinese patent publication No. CN 101662040a discloses a method for measuring the first coulombic efficiency of lithium batteries, which is mainly to manufacture lithium ion batteries of different specifications, connect the batteries after liquid injection and aging to a testing device, and record the charge and discharge efficiency.
Chinese patent publication No. CN108134141A discloses a static zinc-bromine battery without a separator, which adopts a top-down sandwich stack structure to reduce the self-discharge effect of the battery, but when the number of stacked layers is too many, the pressure-bearing capacity of the electrode plate is not sufficient, which may cause the risk of leakage of the battery.
Chinese patent publication No. CN105680082A discloses a structure of a long-life zinc-bromine flow battery, which employs a diaphragm and a circulation pump, resulting in a complicated structure of a battery system, which is not favorable for miniaturization, and the theoretical efficiency of the battery system cannot be truly reflected due to the influence of the circulation system.
In addition, for the efficiency or capacity detection of sodium-sulfur batteries, lead-acid batteries and lithium ion batteries, the batteries are generally made into dry battery finished products, and then the efficiency or capacity detection is carried out on the dry battery finished products. In the process of verifying the battery capacity, the formula and the structure of the battery need to be repeatedly redesigned, then the battery is made into a dry battery finished product, a corresponding testing device needs to be designed, the whole process period is long, and the device is complicated. Because flow batteries cannot be made into dry cell batteries, the prior art test devices are not suitable for detecting flow battery efficiency/capacity.
Disclosure of Invention
In view of the above, the present invention is directed to a liquid battery efficiency detection apparatus, so as to solve the problem that the existing test apparatus cannot detect the efficiency/capacity of a liquid battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a liquid battery efficiency detection device comprises a negative electrode frame, a single battery frame and a positive electrode frame which are connected in sequence; a negative plate is arranged on one side, adjacent to the single-cell frame, of the negative frame, and the negative frame is provided with a negative lead-out screw rod in contact with the negative plate; after the negative electrode frame and the single battery frame are overlapped, the negative electrode frame and the single battery frame form a sealed electrolyte chamber; the monocell frame is provided with a liquid injection hole communicated with the sealed electrolyte cabin; and a bipolar plate is arranged on one side of the positive electrode frame, which is adjacent to the single cell frame, and a positive electrode lead-out screw rod which is in contact with the bipolar plate is arranged on the positive electrode frame.
Optionally, the number of the single battery frames is multiple; the rest single cell frames except the single cell frame closest to the negative electrode frame in the plurality of single cell frames are provided with bipolar plates; the bipolar plate is arranged on one side of the residual single cell frame adjacent to the negative electrode frame; after the two adjacent single battery frames are overlapped, the two adjacent single battery frames form a sealed electrolyte cabin, and each single battery frame is provided with a liquid injection hole communicated with the corresponding sealed electrolyte cabin.
Optionally, an upper sealing ring is arranged on one side of the single battery frame adjacent to the negative electrode frame, and a lower sealing ring is arranged on one side of the single battery frame adjacent to the positive electrode frame; the bipolar plate is embedded into the lower sealing ring.
Optionally, a groove is formed on one side of the single cell frame adjacent to the negative electrode frame, and the negative electrode plate is placed in the groove.
Optionally, the negative electrode frame, the single cell frame and the positive electrode frame are provided with assembling holes; the negative electrode frame, the single-cell frame and the positive electrode frame are sequentially connected in parallel through the compression bolts matched with the assembling holes.
Optionally, the negative electrode frame, the single-cell frame and the positive electrode frame are all rectangular frames made of organic glass.
Optionally, the height of the sealed electrolyte compartment is 5-8 mm.
Optionally, the bipolar plate is formed by bonding a metal plate with an anticorrosive conductive coating and a graphite felt by using a conductive sizing material; the negative plate is composed of a metal plate with an anti-corrosion conductive coating.
Optionally, the metal plate is one of an aluminum alloy plate, a copper plate, a titanium plate and a steel plate; the anticorrosion conductive coating is TiN coating, TiC coating, SiC coating and C3N4One of a coating, a boron-doped diamond coating; the conductive adhesive material is one of high polymer resin materials doped with graphite, silver powder and aluminum powder.
A second object of the present invention is to provide a method for detecting a coulomb efficiency of a battery by using the liquid battery efficiency detection apparatus, including the steps of:
leading the positive electrode of the battery out of the positive electrode leading screw by using a lead, and connecting the positive electrode of the battery with the positive electrode of a battery tester;
connecting the negative lead-out screw rod with a negative electrode of a battery tester by using a lead, connecting a positive electrode of the battery tester with a positive electrode of the battery tester, connecting a negative electrode of the battery tester with a negative electrode of the battery tester, and testing the coulomb efficiency of the battery;
during testing, recording the charging and discharging parameters of the battery under each charging and discharging period by adopting the testing software of the battery testing instrument, and calculating the coulomb efficiency of the battery according to the following formula:
coulombic efficiency (output amp hour/input amp hour) x 100%.
Compared with the prior art, the liquid battery efficiency detection device has the following advantages:
1. the liquid battery efficiency detection device can directly detect the charge and discharge efficiency of the liquid battery electrolyte, can be used for rapidly evaluating and judging the performance of the battery electrolyte and the performance of a battery polar plate, is simple, can be rapidly disassembled and cleaned, facilitates the replacement of the electrolyte and the polar plate, and greatly improves the detection efficiency.
2. The liquid battery efficiency detection device can be used for assembling batteries with different specifications at will, and conveniently and quickly realizes the inspection of the batteries with different specifications.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an exploded structure of a three-section liquid battery efficiency detection device according to the present invention;
FIG. 2 is an exploded front view of the three-section liquid battery efficiency detection device of the present invention;
FIG. 3 is an assembled front sectional view of the three-section liquid battery efficiency detection device of the present invention;
FIG. 4 is an assembled side sectional view of the three-section liquid battery efficiency detection device of the present invention;
FIG. 5 is a graph showing the charge-discharge efficiency of a single cell measured by the liquid cell efficiency measuring device according to the present invention for 100 times;
FIG. 6 is a graph showing the efficiency of 100 times charging and discharging of a double cell according to the present invention;
fig. 7 is a graph illustrating the efficiency of 100 times charging and discharging of three batteries according to the liquid battery efficiency detection apparatus of the present invention.
Reference numerals:
1-compression nut, 2-negative electrode frame, 3-negative electrode lead-out screw, 4-single cell frame, 5-compression screw, 6-positive electrode lead-out screw, 7-bipolar plate, 8-liquid injection hole plug, 9-negative electrode plate, 10-upper sealing ring, 11-lower sealing ring, 12-sealed electrolyte cabin and 13-positive electrode frame.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to examples.
Example 1
Referring to fig. 1-4, a liquid battery efficiency detection device includes a negative electrode frame 2, a single battery frame 4, and a positive electrode frame 13 connected in sequence; a negative plate 9 is arranged on one side of the negative frame 2, which is adjacent to the single-cell frame 4, and the negative frame 2 is provided with a negative lead-out screw 3 which is in contact with the negative plate 9; after the negative electrode frame 2 and the single battery frame 4 are overlapped, the negative electrode frame 2 and the single battery frame 4 form a sealed electrolyte chamber 12, and at the moment, the negative electrode plate 9 is arranged between the negative electrode frame 2 and the single battery frame 4; the single cell frame 4 is provided with a liquid injection hole communicated with the sealed electrolyte chamber 12; the side of the positive frame 13 adjacent to the cell frame 4 is provided with a bipolar plate 7, and the positive frame 13 is provided with a positive lead screw 6 in contact with the bipolar plate 7.
In this embodiment, through connecting negative pole frame 2, monocell frame 4, positive frame 13 coincide in proper order, in the coincide connection process, make negative pole frame 2 that has negative plate 9 and monocell frame 4 form the sealed electrolyte cabin 12 that can pour into the electrolyte into, and set up bipolar plate 7 in one side that positive frame 13 is close to monocell frame 4, and adopt negative pole extraction screw 3 and anodal extraction screw 6 to be connected with negative plate 9 and bipolar plate 7 contact respectively, realize being connected of this embodiment liquid battery efficiency detection device and battery tester, thereby realize the detection to liquid electrode efficiency, whole device is simple, can dismantle fast and wash, and be convenient for the change of electrolyte and polar plate, detection efficiency has been improved greatly.
Also, in the present embodiment, in order to improve the efficiency of assembly, a groove is provided on the side of the cell frame 4 adjacent to the negative electrode frame 2, and the negative electrode plate 9 is placed in the groove.
The liquid battery efficiency detection device is assembled by the following method:
inserting the compression screw 5 into the assembling hole of the positive electrode frame 13;
embedding the bipolar plate 7 into one side of the positive electrode frame 13, which is adjacent to the single cell frame 4, and in order to improve the sealing performance of the sealed electrolyte chamber 12 in the whole device, arranging an upper sealing ring 10 at one side of the single cell frame 4, which is adjacent to the negative electrode frame 2, and arranging a lower sealing ring 11 at one side of the single cell frame 4, which is adjacent to the positive electrode frame 13, and then, penetrating the compression screw 5 through an assembly hole of the single cell frame 4 to be spliced with the positive electrode frame 13, wherein the bipolar plate 7 is positioned between the positive electrode frame 13 and the single cell frame 4;
placing a negative plate 9 in a groove on one side of a single cell frame 4 adjacent to a negative electrode frame 2, then, penetrating a compression screw 5 through an assembly hole of the negative electrode frame 2, superposing the negative electrode frame 2 and the single cell frame 4 to form a sealed electrolyte cabin 12 with the height of 5mm, arranging an electrolyte injection hole communicated with the sealed electrolyte cabin 12 on the single cell frame 4, and injecting electrolyte to be tested into the sealed electrolyte cabin 12 through the electrolyte injection hole and blocking the electrolyte injection hole by an electrolyte injection hole plug 8 when the battery efficiency test is required;
after a compression screw 5 penetrates through an assembly hole of a negative electrode frame 2, a compression nut 1 is sleeved on the compression screw 5 and screwed to form a single cell, and then a positive electrode lead-out screw 6 and a negative electrode lead-out screw 3 are respectively screwed into a positive electrode frame 13 and the negative electrode frame 2, wherein the positive electrode lead-out screw 6 is in contact with a bipolar plate 7, and the negative electrode lead-out screw 3 is in contact with a negative electrode plate 9.
The assembly of the liquid battery efficiency detection device of this embodiment can be completed according to the above steps, and after the liquid battery efficiency detection device of this embodiment is assembled, the positive electrode frame 13, the bipolar plate 7, the lower seal ring 11, the first cell frame 4 (the cell frame closest to the positive electrode frame 13), the upper seal ring 10, the negative electrode plate 9, and the negative electrode frame 2 are arranged in sequence from bottom to top according to the directions shown in fig. 1 to 4.
The liquid battery efficiency detection device adopting the embodiment is used for detecting the coulomb efficiency of the battery, and specifically comprises the following steps:
injecting the liquid battery electrolyte into the sealed electrolyte chamber 12, and plugging the electrolyte injection hole by the electrolyte injection hole plug 8;
the positive pole of the battery is led out of the screw 6 and is connected with the positive pole of the battery tester by a lead;
connecting the negative lead-out screw rod 3 with the negative pole of the battery tester by using a lead, connecting the positive pole of the battery tester with the positive pole of the battery tester, connecting the negative pole of the battery tester with the negative pole of the battery tester, and testing the coulomb efficiency of the battery;
during testing, recording the charging and discharging parameters of the battery under each charging and discharging period by adopting the testing software of the battery testing instrument, and calculating the coulomb efficiency of the battery according to the following formula:
coulombic efficiency (output amp hour/input amp hour) x 100%.
Example 2
As shown in fig. 1 to 4, the present embodiment is different from embodiment 1 in that: the liquid battery efficiency detecting apparatus of the present embodiment has two cell frames 4, wherein one cell frame 4 is closest to the positive electrode frame 13 (the first cell frame), one cell frame 4 is closest to the negative electrode frame 2 (the second cell frame), a bipolar plate is disposed on a side of the positive electrode frame 13 adjacent to the first cell frame, a bipolar plate is also disposed on a side of the first cell frame adjacent to the negative electrode frame 2, a groove for placing the negative electrode plate 9 on the negative electrode frame 2 is disposed on a side of the second cell frame adjacent to the negative electrode frame 2, when the cell frame 4 closest to the negative electrode frame 2 is overlapped on the cell frame 4 closest to the positive electrode frame 13, the bipolar plate 7 on the cell frame 4 closest to the negative electrode frame 2 and the cell frame 4 closest to the positive electrode frame 13 form a first sealed electrolyte chamber 12, and when the negative electrode frame 2 is overlapped on the cell frame 4 closest to the negative electrode frame 2, the negative frame 2 forms a second sealed electrolyte chamber 12 with the cell frame 4 nearest the negative frame 2, that is, when the second cell frame is stacked on the first cell frame, the negative electrode frame 2 is stacked on the second cell frame, the second cell frame forms a first sealed electrolyte compartment 12 with the first cell frame, the negative electrode frame 2 forms a second sealed electrolyte compartment 12 with the second cell frame, in order to conveniently inject electrolyte to be tested into the two sealed electrolyte cabins 12, the two single cell frames 4 are respectively provided with an injection hole communicated with the corresponding sealed electrolyte cabins 12, that is, the cell frame 4 (first cell frame) nearest to the positive electrode frame 13 is provided with a liquid injection hole communicating with the first sealed electrolyte chamber 12, and the cell frame 4 (second cell frame) nearest to the negative electrode frame 2 is provided with a liquid injection hole communicating with the second sealed electrolyte chamber 12. In order to improve the sealing performance of the two sealed electrolyte compartments 12, an upper sealing ring 10 is arranged on one side of each of the two cell frames 4 adjacent to the negative electrode frame 2, a lower sealing ring 11 is arranged on one side of each of the two cell frames 4 adjacent to the positive electrode frame 13, the bipolar plate 7 on the positive electrode frame 13 is embedded into the lower sealing ring 11 of the first cell frame 4, and the bipolar plate 7 on the first cell frame 4 is embedded into the lower sealing ring 11 of the second cell frame.
In the present embodiment, the two cell frames 4 are assembled by the following method:
after connecting the cell frame 4 (first cell frame) having the bipolar plate 7 and nearest to the positive electrode frame 13 with the positive electrode frame 13 having the bipolar plate 7 by the pressing screw 5, the cell frame 4 (second cell frame) nearest to the negative electrode frame 2 is stacked on the cell frame 4 (first cell frame) having the bipolar plate 7 and nearest to the positive electrode frame 13 to form a first sealed electrolyte chamber 12 having a height of 5mm, and then the negative electrode frame 2 having the negative electrode plate 9 is stacked on the cell frame 4 (second cell frame) nearest to the negative electrode frame 2 to form a second sealed electrolyte chamber 12 having a height of 5mm, and the two-cell battery pack is assembled by tightening the pressing nut 1, wherein the assembly steps of other members in the liquid battery efficiency detecting device are the same as those in embodiment 1, that is, after the liquid battery efficiency detecting device of this embodiment is assembled, according to the direction shown in fig. 1-4, the components are arranged in the order of a positive electrode frame 13, a bipolar plate 7, a lower seal ring 11, a single cell frame 4 (first single cell frame) nearest to the positive electrode frame 13, an upper seal ring 10, the bipolar plate 7, the lower seal ring 11, the single cell frame 4 (second single cell frame) nearest to the negative electrode frame 2, the upper seal ring 10, a negative electrode plate 9, and the negative electrode frame 2 from bottom to top.
The liquid battery efficiency detection device adopting the embodiment is used for detecting the coulomb efficiency of the battery, and specifically comprises the following steps:
injecting the liquid battery electrolyte into the first sealed electrolyte chamber 12 and the second sealed electrolyte chamber 12, and blocking the electrolyte injection hole by the electrolyte injection hole plug 8;
the positive pole of the battery is led out of the positive pole leading screw 6 by a lead and is connected with the positive pole of the battery tester;
connecting the negative lead-out screw rod 3 with the negative pole of the battery tester by using a lead, connecting the positive pole of the battery tester with the positive pole of the battery tester, connecting the negative pole of the battery tester with the negative pole of the battery tester, and testing the coulomb efficiency of the battery;
during testing, recording the charging and discharging parameters of the battery under each charging and discharging period by adopting the testing software of the battery testing instrument, and calculating the coulomb efficiency of the battery according to the following formula:
coulombic efficiency (output amp hour/input amp hour) x 100%.
Example 3
As shown in fig. 1 to 4, the present embodiment is different from embodiment 1 in that: the number of the cell frames 4 in this embodiment is three, wherein one cell frame 4 is closest to the positive electrode frame 13 (the first cell frame), one cell frame 4 is closest to the negative electrode frame 2 (the third cell frame), one cell frame 4 is located between the two cell frames 4 (the second cell frame is located between the first cell frame and the third cell frame), that is, the three cell frames 4 are sequentially stacked from bottom to top in the direction shown in fig. 1 to 4, a bipolar plate is disposed on the side of the positive electrode frame 13 adjacent to the first cell frame, bipolar plates are disposed on the sides of the first cell frame and the second cell frame adjacent to the negative electrode frame 2, a groove for placing the negative electrode plate 9 on the negative electrode frame 2 is disposed on the side of the third cell frame adjacent to the negative electrode frame 2, when the middle cell frame 4 is stacked on the cell frame 4 closest to the positive electrode frame 13, the middle cell frame 4 and the cell frame 4 adjacent to the positive electrode frame 13 form a first sealed electrolyte compartment 12, the cell frame 4 closest to the negative electrode frame 2 and the middle cell frame 4 form a second sealed electrolyte compartment 12 when the cell frame 4 closest to the negative electrode frame 2 is superimposed on the middle cell frame 4, and the negative electrode frame 2 and the cell frame 4 closest to the negative electrode frame 2 form a third sealed electrolyte compartment 12 when the negative electrode frame 2 is superimposed on the cell frame 4 closest to the negative electrode frame 2, i.e. the second cell frame and the first cell frame form a first sealed electrolyte compartment 12 when the second cell frame is superimposed on the first cell frame and the third cell frame is superimposed on the second cell frame and the negative electrode frame 2 is superimposed on the third cell frame, the third cell frame and the second cell frame form a second sealed electrolyte compartment 12, the negative electrode frame 2 and the third single cell frame form a second sealed electrolyte chamber 12, and in order to facilitate the injection of the electrolyte to be measured into the three sealed electrolyte chambers 12, the three single cell frames 4 are each provided with an injection hole communicated with the corresponding sealed electrolyte chamber 12, that is, the single cell frame 4 (the first single cell frame) nearest to the positive electrode frame 13 is provided with an injection hole communicated with the first sealed electrolyte chamber 12, the middle single cell frame 4 (the second single cell frame) is provided with an injection hole communicated with the second sealed electrolyte chamber 12, and the single cell frame 4 (the third single cell frame) nearest to the negative electrode frame 2 is provided with an injection hole communicated with the third sealed electrolyte chamber 12. In order to improve the sealing performance of the three sealed electrolyte compartments 12, upper sealing rings 10 are respectively arranged on the sides of the three single cell frames 4 adjacent to the negative electrode frame 2, lower sealing rings 11 are respectively arranged on the sides of the three single cell frames 4 adjacent to the positive electrode frame 13, the bipolar plate 7 on the positive electrode frame 13 is embedded into the lower sealing ring 11 of the first single cell frame 4, the bipolar plate 7 on the first single cell frame 4 is embedded into the lower sealing ring 11 of the second single cell frame, and the bipolar plate 7 on the second single cell frame is embedded into the lower sealing ring 11 of the third single cell frame.
In the present embodiment, three single cell frames 4 are assembled by the following method:
after connecting the cell frame 4 (first cell frame) with the bipolar plate 7 and nearest to the positive electrode frame 13 with the compression screw 5, the middle cell frame 4 (second cell frame) with the bipolar plate 7 is overlapped on the cell frame 4 (first cell frame) nearest to the positive electrode frame 13 to form a first sealed electrolyte chamber 12 with a height of 5mm, then the cell frame 4 (third cell frame) nearest to the negative electrode frame 2 is overlapped on the middle cell frame 4 (second cell frame) to form a second sealed electrolyte chamber 12 with a height of 5mm, then the negative electrode frame 2 with the negative electrode plate 9 is overlapped on the cell frame 4 (third cell frame) nearest to the negative electrode frame 2 to form a third sealed electrolyte chamber 12 with a height of 5mm, and the assembled three-cell battery is tightened with the compression nut 1, the steps of assembling the other components in the liquid battery efficiency detection apparatus are the same as those in embodiment 1, that is, after the liquid battery efficiency detection apparatus of this embodiment is assembled, the positive electrode frame 13, the bipolar plate 7, the lower seal ring 11, the cell frame 4 (first cell frame) closest to the positive electrode frame 13, the upper seal ring 10, the bipolar plate 7, the lower seal ring 11, the middle cell frame 4 (second cell frame), the upper seal ring 10, the bipolar plate 7, the lower seal ring 11, the cell frame 4 (third cell frame) closest to the negative electrode frame 2, the upper seal ring 10, the negative electrode plate 9, and the negative electrode frame 2 are arranged in this order from bottom to top in the direction shown in fig. 1 to 4.
The liquid battery efficiency detection device adopting the embodiment is used for detecting the coulomb efficiency of the battery, and specifically comprises the following steps:
injecting the liquid battery electrolyte into a first sealed electrolyte chamber 12, a second sealed electrolyte chamber 12 and a third sealed electrolyte chamber 12, and blocking the electrolyte injection hole by an electrolyte injection hole plug 8;
the positive pole of the battery is led out of the positive pole leading screw 6 by a lead and is connected with the positive pole of the battery tester;
connecting the negative lead-out screw rod 3 with the negative pole of the battery tester by using a lead, connecting the positive pole of the battery tester with the positive pole of the battery tester, connecting the negative pole of the battery tester with the negative pole of the battery tester, and testing the coulomb efficiency of the battery;
during testing, recording the charging and discharging parameters of the battery under each charging and discharging period by adopting the testing software of the battery testing instrument, and calculating the coulomb efficiency of the battery according to the following formula:
coulombic efficiency (output amp hour/input amp hour) x 100%.
In order to improve the detection accuracy, the negative electrode frame 2, the single cell frames 4 and the positive electrode frame 13 are sequentially connected in parallel through the compression bolts matched with the assembly holes on the negative electrode frame 2, the single cell frames 4 and the positive electrode frame 13. The negative electrode frame 2, each single-cell frame 4 and the positive electrode frame 13 are all cuboid frames made of organic glass, but the shape of the negative electrode frame is not limited to the cuboid frame, and the negative electrode frame can also be other shapes, such as a square frame, a round frame and the like; the material is not limited to organic glass, but may be other materials, such as Polytetrafluoroethylene (PTFE), High Density Polyethylene (HDPE), Polycarbonate (PC), Polyoxymethylene (POM), and the like.
In the invention, the bipolar plate 7 is formed by bonding a metal plate with an anticorrosive conductive coating and a graphite felt by using a conductive sizing material, and the negative plate 9 is formed by a metal plate with an anticorrosive conductive coating, wherein the metal plate is preferably one of an aluminum alloy plate, a copper plate, a titanium plate and a steel plate; the anticorrosive conductive coating is preferably TiN coating, TiC coating, SiC coating and C3N4One of a coating, a boron-doped diamond coating; the conductive sizing material is preferably one of high polymer resin materials doped with graphite, silver powder and aluminum powder.
The liquid battery efficiency detection device of embodiments 1-3 of the present invention was used to detect the coulomb efficiency of the battery, and the detection results are shown in fig. 5-7 and table 1, respectively.
As can be seen from fig. 5-7 and table 1, the liquid battery efficiency detection device in embodiments 1 to 3 of the present invention can rapidly and simply implement the detection of the charge and discharge efficiency of any liquid battery, greatly reduce the manufacturing period of the battery sample, reduce the manufacturing difficulty, and provide a reliable way for the efficiency detection of the liquid battery.
TABLE 1
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The liquid battery efficiency detection device is characterized by comprising a negative electrode frame, a single battery frame and a positive electrode frame which are sequentially connected; a negative plate is arranged on one side, adjacent to the single-cell frame, of the negative frame, and the negative frame is provided with a negative lead-out screw rod in contact with the negative plate; after the negative electrode frame and the single battery frame are overlapped, the negative electrode frame and the single battery frame form a sealed electrolyte chamber; the monocell frame is provided with a liquid injection hole communicated with the sealed electrolyte cabin; and a bipolar plate is arranged on one side of the positive electrode frame, which is adjacent to the single cell frame, and a positive electrode lead-out screw rod which is in contact with the bipolar plate is arranged on the positive electrode frame.
2. The liquid cell efficiency detection apparatus according to claim 1, wherein the single cell frame is plural; the rest single cell frames except the single cell frame closest to the negative electrode frame in the plurality of single cell frames are provided with bipolar plates; the bipolar plate is arranged on one side of the residual single cell frame adjacent to the negative electrode frame; after the two adjacent single battery frames are overlapped, the two adjacent single battery frames form a sealed electrolyte cabin, and each single battery frame is provided with a liquid injection hole communicated with the corresponding sealed electrolyte cabin.
3. The liquid battery efficiency detection apparatus according to claim 1 or 2, wherein an upper seal ring is provided on a side of the cell frame adjacent to the negative electrode frame, and a lower seal ring is provided on a side of the cell frame adjacent to the positive electrode frame; the bipolar plate is embedded into the lower sealing ring.
4. The liquid cell efficiency detection apparatus according to claim 1, wherein a side of the single cell frame adjacent to the negative electrode frame is provided with a groove, and the negative electrode plate is placed in the groove.
5. The liquid battery efficiency detection apparatus according to claim 1, wherein the negative electrode frame, the single battery frame, and the positive electrode frame are each provided with an assembly hole; the negative electrode frame, the single-cell frame and the positive electrode frame are sequentially connected in parallel through the compression bolts matched with the assembling holes.
6. The liquid cell efficiency detection device according to claim 1 or 5, wherein the negative electrode frame, the single cell frame, and the positive electrode frame are rectangular parallelepiped frames made of organic glass.
7. The liquid battery efficiency detection apparatus according to claim 1 or 2, wherein the height of the sealed electrolyte compartment is 5 to 8 mm.
8. The liquid battery efficiency detection device according to claim 1, wherein the bipolar plate is formed by bonding a metal plate with an anticorrosive conductive coating and a graphite felt by using a conductive adhesive; the negative plate is composed of a metal plate with an anti-corrosion conductive coating.
9. The liquid battery efficiency detection apparatus according to claim 7, wherein the metal plate is one of an aluminum alloy plate, a copper plate, a titanium plate, and a steel plate; the anticorrosion conductive coating is TiN coating, TiC coating, SiC coating and C3N4One of a coating, a boron-doped diamond coating; the conductive adhesive material is one of high polymer resin materials doped with graphite, silver powder and aluminum powder.
10. The method for detecting a liquid cell efficiency detection apparatus according to any one of claims 1 to 9, characterized by comprising the steps of:
injecting liquid battery electrolyte into the sealed electrolyte cabin, and plugging the grouting holes by grouting hole plugs;
leading the positive electrode of the battery out of the positive electrode leading screw by using a lead, and connecting the positive electrode of the battery with the positive electrode of a battery tester;
connecting the negative lead-out screw rod with a negative electrode of a battery tester by using a lead, connecting a positive electrode of the battery tester with a positive electrode of the battery tester, connecting a negative electrode of the battery tester with a negative electrode of the battery tester, and testing the coulomb efficiency of the battery;
during testing, recording the charging and discharging parameters of the battery under each charging and discharging period by adopting the testing software of the battery testing instrument, and calculating the coulomb efficiency of the battery according to the following formula:
coulombic efficiency (output amp hour/input amp hour) x 100%.
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