CN117732758A - Method and system for judging consistency of moisture content of battery - Google Patents
Method and system for judging consistency of moisture content of battery Download PDFInfo
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- CN117732758A CN117732758A CN202311693640.0A CN202311693640A CN117732758A CN 117732758 A CN117732758 A CN 117732758A CN 202311693640 A CN202311693640 A CN 202311693640A CN 117732758 A CN117732758 A CN 117732758A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003792 electrolyte Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 239000011267 electrode slurry Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 239000007774 positive electrode material Substances 0.000 claims description 8
- 230000008595 infiltration Effects 0.000 claims description 7
- 238000001764 infiltration Methods 0.000 claims description 7
- 239000007773 negative electrode material Substances 0.000 claims description 7
- 239000011888 foil Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 4
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910021385 hard carbon Inorganic materials 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a method and a system for judging consistency of water content of a battery, wherein the method comprises the following steps: preparing a batch of cells; injecting electrolyte into all batteries, standing at a high temperature, and testing the battery voltage of T1 time and T2 time after standing, wherein T1 is smaller than T2; calculating the difference value of the voltage of each battery T2 time and the voltage of each battery T1 time, if the voltage difference values of all the batteries are the same in sign and the difference value is in a preset range, the moisture content of the batteries of the batch is consistent, otherwise, the moisture content is inconsistent, and eliminating or downshifting the batteries with the voltage difference values of outliers; the invention has the advantages that: and the consistency of the moisture content of the battery is detected, the product yield is improved, and the production quality is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a system for judging consistency of water content of batteries.
Background
Moisture is strictly controlled in the lithium ion battery manufacturing process, because moisture affects various parameters such as the initial efficiency, the internal resistance, the thickness, the cycle performance and the like of the battery. When the water content of the battery exceeds the standard, water reacts with electrolyte to form hydrofluoric acid in a standing process at high temperature, corroding a negative electrode current collector, generating copper ions with strong reducibility, dissociating in the electrolyte, reaching the positive electrode through concentration diffusion, reacting with iron ions in the positive electrode material, and pulling down the potential of the positive electrode to reduce the voltage of the positive electrode and the negative electrode. At present, the moisture detection generally adopts a sampling inspection mode, and the moisture content and the consistency of the content of all batteries cannot be determined, so that the risk of unqualified moisture content exists in the delivered batteries, and the overall performance of the battery pack is affected. Chinese patent publication No. CN111554990a discloses a battery consistency screening method, comprising the steps of: preliminary screening is carried out on the N batteries to obtain M preliminary qualified batteries; and taking the average capacity value of the M batteries under the preset discharge voltage as a reference capacity, and carrying out consistency grouping according to the voltage difference of the batteries under the reference capacity, thereby improving the accuracy of battery grouping and effectively improving the consistency of the assembled batteries. However, this patent application fails to detect the consistency of the moisture content of the battery, and thus fails to exclude products having an unacceptable moisture content.
Disclosure of Invention
The invention aims to solve the technical problems that the prior art cannot detect the consistency of the moisture content of the battery, so that the quality of a battery pack is affected due to missed detection of defective products.
The invention solves the technical problems by the following technical means: a method for judging consistency of moisture content of a battery comprises the following steps:
step one, preparing a batch of batteries;
step two, electrolyte is injected into all batteries, the batteries are kept stand at a high temperature, the battery voltage of the time T1 and the time T2 after the standing is tested, and T1 is smaller than T2;
thirdly, calculating the difference value between the voltage of each battery at the time T2 and the voltage of each battery at the time T1, if the voltage difference values of all the batteries are identical in sign and the difference value is in a preset range, the moisture content of the batteries in the batch is consistent, otherwise, the moisture content is inconsistent, and eliminating or downshifting the batteries with the voltage difference values being outliers.
Further, the first step includes:
and coating positive electrode slurry on the surface of a positive electrode current collector, drying, preparing a positive electrode plate, coating negative electrode slurry on the surface of a negative electrode current collector, drying, preparing a negative electrode plate, arranging a plurality of lugs on the positive electrode plate and the negative electrode plate, assembling the positive electrode plate and the negative electrode plate provided with the lugs into a pole group, sealing the pole group in a shell, baking, dehydrating and drying to obtain the battery.
Further, the positive electrode active material in the positive electrode slurry is one or more of lithium iron phosphate, lithium manganate, lithium cobaltate and ternary materials, and the negative electrode active material in the negative electrode slurry is one or more of graphite, lithium titanate, silicon oxide, silicon carbon and hard carbon.
Further, the positive electrode current collector and the negative electrode current collector are both metal foils.
Still further, the positive current collector is aluminum foil and the negative current collector is copper foil.
Furthermore, the positive plate and the negative plate are laminated or wound in a composite mode, a diaphragm is arranged between the positive plate and the negative plate, and the diaphragm is a dry PP diaphragm, a wet PE diaphragm, a ceramic diaphragm or a glue-coated diaphragm.
Furthermore, the lugs are uniformly distributed on the inner and outer surfaces of the pole group.
Further, the shell is an aluminum shell or a soft package.
Further, the baking mode can be a wind-carrying mode or a contact mode.
Further, the standing at high temperature is to put the battery into a high Wen Jinrun warehouse.
Still further, the temperature of the high temperature infiltration tank is > 42 ℃.
Further, the T1 time is in the range of 4 to 8 hours, and the T2 time is in the range of 12 to 72 hours.
Still further, the T1 time is 4 hours and the T2 time is 12 hours.
Further, the difference between the voltage at the time T2 and the voltage at the time T1 is inversely proportional to the moisture content of the battery, and gradually decreases from a positive value to a negative value as the moisture content increases.
The voltage is the voltage between the anode and the cathode of the battery, or the voltage between the anode and the cathode and the shell.
The invention also provides a system for judging the consistency of the moisture content of the battery, which comprises the following steps:
the battery preparation module is used for preparing a batch of batteries;
the static module is used for injecting electrolyte into all batteries, standing at a high temperature, testing the battery voltage at the time T1 and the time T2 after standing, wherein T1 is smaller than T2;
the consistency analysis module is used for calculating the difference value between the voltage of each battery T2 time and the voltage of each battery T1 time, if the voltage difference values of all the batteries are identical in sign and within a preset range, the moisture content of the batteries of the batch is consistent, otherwise, the moisture content is inconsistent, and the batteries with the voltage difference values being outliers are removed or downshifted.
Further, the battery preparation module is further configured to:
and coating positive electrode slurry on the surface of a positive electrode current collector, drying, preparing a positive electrode plate, coating negative electrode slurry on the surface of a negative electrode current collector, drying, preparing a negative electrode plate, arranging a plurality of lugs on the positive electrode plate and the negative electrode plate, assembling the positive electrode plate and the negative electrode plate provided with the lugs into a pole group, sealing the pole group in a shell, baking, dehydrating and drying to obtain the battery.
Further, the positive electrode active material in the positive electrode slurry is one or more of lithium iron phosphate, lithium manganate, lithium cobaltate and ternary materials, and the negative electrode active material in the negative electrode slurry is one or more of graphite, lithium titanate, silicon oxide, silicon carbon and hard carbon.
Further, the positive electrode current collector and the negative electrode current collector are both metal foils.
Furthermore, the positive plate and the negative plate are laminated or wound in a composite mode, a diaphragm is arranged between the positive plate and the negative plate, and the diaphragm is a dry PP diaphragm, a wet PE diaphragm, a ceramic diaphragm or a glue-coated diaphragm.
Further, the standing at high temperature is to put the battery into a high Wen Jinrun warehouse.
Still further, the temperature of the high temperature infiltration tank is > 42 ℃.
Further, the T1 time is in the range of 4 to 8 hours, and the T2 time is in the range of 12 to 72 hours.
Still further, the T1 time is 4 hours and the T2 time is 12 hours.
Further, the difference between the voltage at the time T2 and the voltage at the time T1 is inversely proportional to the moisture content of the battery, and gradually decreases from a positive value to a negative value as the moisture content increases.
The invention has the advantages that: according to the invention, by directly measuring two voltages in the battery soaking process, the signs of the two voltage difference values are the same and the difference value is within the preset range, the moisture content of the batteries in the batch is consistent, otherwise, the moisture content is inconsistent, the difference of the moisture content can be effectively represented by calculating the voltage difference value, the method belongs to nondestructive detection, and the batteries separated from water can be downshifted or directly scrapped, so that the yield of the production line can be improved, the energy consumption waste is reduced, and the production quality is improved.
Drawings
FIG. 1 is a flow chart of a method for determining consistency of moisture content of a battery according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a battery pole group in a method for determining consistency of moisture content of a battery according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery in a method for determining consistency of moisture content of a battery according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a voltage change during a high-temperature rest process of a battery in a method for determining consistency of moisture content of the battery according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the invention provides a method for judging consistency of moisture content of a battery, which comprises the following steps:
s1, mixing a positive electrode material (lithium iron phosphate) and a positive electrode auxiliary material according to a certain proportion, mixing the mixture into slurry, coating and rolling the slurry on the surface of a positive electrode current collector, and drying to form a positive electrode plate; mixing the negative electrode material (artificial graphite) and the negative electrode auxiliary material according to a certain proportion, mixing the slurry, coating the slurry on the surface of a negative electrode current collector by a roll, and drying to form the negative electrode plate. The positive current collector is aluminum foil, and the negative current collector is copper foil.
S2, a diaphragm is arranged between the positive plate and the negative plate, and the diaphragm is a dry PP diaphragm, a wet PE diaphragm, a ceramic diaphragm or a glue-coated diaphragm. The positive and negative electrode materials and the diaphragm are subjected to slitting, cutting and winding to form a pole group, wherein a plurality of pole lugs are arranged on the positive and negative electrode materials, and the positive and negative pole lugs are respectively overlapped after winding, as shown in figure 2.
S3, sealing the two pole groups in the shell 1 through a series of assembly procedures, wherein the shell is an aluminum shell or a soft package to form a battery, and the battery is provided with positive and negative pole posts 2 as shown in FIG 3.
S4: and baking the assembled battery to remove the moisture of the pole piece to enable the pole piece to reach a certain moisture standard (175 ppm). The baking mode can be a wind-carrying mode or a contact mode.
S5: mixing 1g, 3g, 5g and 10g of water in 500g of electrolyte uniformly, taking out 20g, and injecting into 4 baked batteries (the water content of the treated batteries is 245ppm, 459ppm, 844ppm and 1636ppm respectively); then, a normally baked battery (moisture content: 175 ppm) was taken, and electrolyte of standard weight was injected into 5 batteries, and after the injection was completed, the batteries were put into a high Wen Jinrun warehouse and allowed to stand.
S6: the 5 cells were monitored for soak voltage for 12 hours and the monitoring results are shown in table 1.
Table 1 comparison table of battery monitoring results
Fig. 4 is a graph showing the change of the cell voltage with time during the high temperature soaking process of 5 cells in this embodiment. Table 1 shows the voltages and differences between the 5 cells at 4 hours and 12 hours of immersion. As can be seen from table 1, as the moisture content increases, the difference (V2-V1) between the voltage V1 at 4 th hour of infiltration and the voltage V2 at 12h of infiltration becomes smaller, and the difference changes from a positive value to a negative value. Note that the difference between 175ppm and 245ppm of the cell moisture was 70pppm and the difference between the differential pressure was 26mv, indicating that the difference was highly sensitive to moisture, and that the cell moisture difference could be accurately represented, so that the consistency of the measured cell moisture could be analyzed. In addition, as can be seen from fig. 4, the measured cell voltage is regularly changed from 4 th to 12 th hours of infiltration, so that the reliability of the result of the differential pressure calculation is high. In summary, the method provided by the invention can simply and accurately evaluate the consistency of the water content of the battery, and provides screening guidance for the battery after liquid injection.
According to the technical scheme, by directly measuring the two voltages in the battery soaking process, then calculating that the signs of the two voltage difference values are the same and the difference value is in the preset range, the moisture content of the batteries in the batch is consistent, otherwise, the moisture content is inconsistent, the difference of the moisture content can be effectively represented through the calculation of the voltage difference value, the method belongs to nondestructive detection, and for the batteries of the water separation group, the downshifting or direct scrapping treatment can be performed, so that the yield of the production line can be improved, the energy consumption waste is reduced, and the production quality is improved.
Example 2
Based on embodiment 1, embodiment 2 of the present invention further provides a system for determining consistency of moisture content of a battery, including:
the battery preparation module is used for preparing a batch of batteries;
the static module is used for injecting electrolyte into all batteries, standing at a high temperature, testing the battery voltage at the time T1 and the time T2 after standing, wherein T1 is smaller than T2;
the consistency analysis module is used for calculating the difference value between the voltage of each battery T2 time and the voltage of each battery T1 time, if the voltage difference values of all the batteries are identical in sign and within a preset range, the moisture content of the batteries of the batch is consistent, otherwise, the moisture content is inconsistent, and the batteries with the voltage difference values being outliers are removed or downshifted.
Specifically, the battery preparation module is further used for:
and coating positive electrode slurry on the surface of a positive electrode current collector, drying, preparing a positive electrode plate, coating negative electrode slurry on the surface of a negative electrode current collector, drying, preparing a negative electrode plate, arranging a plurality of lugs on the positive electrode plate and the negative electrode plate, assembling the positive electrode plate and the negative electrode plate provided with the lugs into a pole group, sealing the pole group in a shell, baking, dehydrating and drying to obtain the battery.
More specifically, the positive electrode active material in the positive electrode slurry is one or more of lithium iron phosphate, lithium manganate, lithium cobaltate and ternary materials, and the negative electrode active material in the negative electrode slurry is one or more of graphite, lithium titanate, silicon oxide, silicon carbon and hard carbon.
More specifically, the positive electrode current collector and the negative electrode current collector are both metal foils.
More specifically, the composite mode of the positive plate and the negative plate is lamination or winding, a diaphragm is arranged between the positive plate and the negative plate, and the diaphragm is a dry PP diaphragm, a wet PE diaphragm, a ceramic diaphragm or a glue coating diaphragm.
Specifically, the standing at high temperature is to put the battery into a high Wen Jinrun warehouse.
More specifically, the temperature of the high-temperature infiltration warehouse is more than 42 ℃.
Specifically, the T1 time ranges from 4 to 8 hours, and the T2 time ranges from 12 to 72 hours.
More specifically, the T1 time is 4 hours and the T2 time is 12 hours.
Specifically, the difference between the voltage at the time T2 and the voltage at the time T1 is inversely proportional to the moisture content of the battery, and as the moisture content increases, the difference gradually decreases, and the difference gradually changes from a positive value to a negative value.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for judging the consistency of the moisture content of the battery is characterized by comprising the following steps of:
step one, preparing a batch of batteries;
step two, electrolyte is injected into all batteries, the batteries are kept stand at a high temperature, the battery voltage of the time T1 and the time T2 after the standing is tested, and T1 is smaller than T2;
thirdly, calculating the difference value between the voltage of each battery at the time T2 and the voltage of each battery at the time T1, if the voltage difference values of all the batteries are identical in sign and the difference value is in a preset range, the moisture content of the batteries in the batch is consistent, otherwise, the moisture content is inconsistent, and eliminating or downshifting the batteries with the voltage difference values being outliers.
2. The method for determining consistency of moisture content of a battery according to claim 1, wherein said step one comprises:
and coating positive electrode slurry on the surface of a positive electrode current collector, drying, preparing a positive electrode plate, coating negative electrode slurry on the surface of a negative electrode current collector, drying, preparing a negative electrode plate, arranging a plurality of lugs on the positive electrode plate and the negative electrode plate, assembling the positive electrode plate and the negative electrode plate provided with the lugs into a pole group, sealing the pole group in a shell, baking, dehydrating and drying to obtain the battery.
3. The method for judging the consistency of the moisture content of the battery according to claim 2, wherein the positive electrode active material in the positive electrode slurry is one or more of lithium iron phosphate, lithium manganate, lithium cobaltate and ternary materials, and the negative electrode active material in the negative electrode slurry is one or more of graphite, lithium titanate, silicon oxide, silicon carbon and hard carbon.
4. The method for judging the consistency of the moisture content of the battery according to claim 2, wherein the positive electrode current collector and the negative electrode current collector are metal foils.
5. The method for judging the consistency of the water content of the battery according to claim 2, wherein the positive plate and the negative plate are laminated or wound in a combined mode, a diaphragm is arranged between the positive plate and the negative plate, and the diaphragm is a dry PP diaphragm, a wet PE diaphragm, a ceramic diaphragm or a glue-coated diaphragm.
6. The method for determining the consistency of the moisture content of a battery according to claim 1, wherein the standing at the high temperature is to put the battery in a high Wen Jinrun warehouse, and the temperature of the high-temperature infiltration warehouse is higher than 42 ℃.
7. The method for determining the consistency of the moisture content of a battery according to claim 1, wherein the time period T1 is in the range of 4 to 8 hours and the time period T2 is in the range of 12 to 72 hours.
8. The method according to claim 7, wherein the time T1 is 4 hours and the time T2 is 12 hours.
9. The method according to claim 1, wherein the difference between the voltage at time T2 and the voltage at time T1 is inversely proportional to the battery moisture content.
10. A system for determining consistency of moisture content of a battery, comprising:
the battery preparation module is used for preparing a batch of batteries;
the static module is used for injecting electrolyte into all batteries, standing at a high temperature, testing the battery voltage at the time T1 and the time T2 after standing, wherein T1 is smaller than T2;
the consistency analysis module is used for calculating the difference value between the voltage of each battery T2 time and the voltage of each battery T1 time, if the voltage difference values of all the batteries are identical in sign and within a preset range, the moisture content of the batteries of the batch is consistent, otherwise, the moisture content is inconsistent, and the batteries with the voltage difference values being outliers are removed or downshifted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311693640.0A CN117732758A (en) | 2023-12-06 | 2023-12-06 | Method and system for judging consistency of moisture content of battery |
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|---|---|---|---|
| CN202311693640.0A CN117732758A (en) | 2023-12-06 | 2023-12-06 | Method and system for judging consistency of moisture content of battery |
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| CN117732758A true CN117732758A (en) | 2024-03-22 |
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| CN202311693640.0A Pending CN117732758A (en) | 2023-12-06 | 2023-12-06 | Method and system for judging consistency of moisture content of battery |
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| Country | Link |
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| CN (1) | CN117732758A (en) |
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