CN113275271A - Sorting method of lithium battery - Google Patents
Sorting method of lithium battery Download PDFInfo
- Publication number
- CN113275271A CN113275271A CN202110541189.5A CN202110541189A CN113275271A CN 113275271 A CN113275271 A CN 113275271A CN 202110541189 A CN202110541189 A CN 202110541189A CN 113275271 A CN113275271 A CN 113275271A
- Authority
- CN
- China
- Prior art keywords
- lithium battery
- lithium
- battery
- voltage
- lithium batteries
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
Landscapes
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a lithium battery sorting method, which comprises the following steps: and sorting the lithium batteries into corresponding energy storage systems according to battery parameters of the lithium batteries, wherein the battery parameters comprise predicted discharge capacity of the lithium batteries at a target temperature, or a self-discharge voltage drop value of the lithium batteries and the predicted discharge capacity at the target temperature, or the self-discharge voltage drop value of the lithium batteries and a conventional discharge capacity. According to the invention, the lithium batteries can be sorted into the corresponding energy storage systems under the condition of meeting actual working conditions through the combination of different battery parameters of the predicted discharge capacity of the lithium batteries at the target temperature, the self-discharge voltage drop value of the lithium batteries and the predicted discharge capacity at the target temperature, and the self-discharge voltage drop value of the lithium batteries and the conventional discharge capacity. According to the lithium battery sorting method and device, accurate sorting of the lithium batteries can be achieved according to the ambient temperature of the lithium batteries to be used, and the consistency degree of the lithium batteries in the energy storage systems of different levels is further higher.
Description
Technical Field
The invention relates to the application field of lithium batteries, in particular to a lithium battery sorting method.
Background
In recent years, with the progress of lithium ion battery technology, the cost is continuously reduced, the cycle life is continuously increased, the application of the lithium ion battery in various energy storage fields at home and abroad is more and more extensive, and the lithium ion battery is demonstrated and commercialized in different application fields such as a power generation side, a power transmission and distribution side, a user side and the like. In large-scale energy storage, container type energy storage systems with MW (megawatt) level are common at present, the installed capacity of one container is generally 1-6MWh (megawatt/hour), and the container type energy storage system is formed by connecting tens of thousands of single batteries in series and in parallel. Because the container type energy storage system has higher requirement on the consistency of the single batteries than that of the common power batteries, the batteries are required to be sorted so as to keep a plurality of batteries in the container consistent.
When sorting lithium ion batteries, the following three methods are generally adopted: the first method is to sort the lithium batteries only according to the conventional discharge capacitor, the influence of the actual working condition on the discharge capacitor of the lithium batteries is not considered in the method, the defect that the output power is inconsistent under the actual working condition is easily caused by the influence of the environmental factors on the lithium batteries, and the second method is to directly fit the relation between the historical capacity grading capacity and the temperature and has the defect of inaccurate capacity grading. Although the influence of voltage is considered in the third mode, the mode needs to carry out charging and discharging circulation of the lithium battery for many times, energy consumption is high, cost is high, and in the third mode, the lithium battery is influenced by environmental factors and has the defect of inaccurate separation of the lithium battery.
Disclosure of Invention
The invention aims to overcome the defects of high capacity grading cost and inaccurate capacity grading of lithium batteries in the prior art, and provides a low-cost and accurate lithium battery sorting method.
The invention solves the technical problems through the following technical scheme:
the invention provides a sorting method of a lithium battery, which comprises the following steps:
and sorting the lithium batteries into corresponding energy storage systems according to battery parameters of the lithium batteries, wherein the battery parameters comprise predicted discharge capacity of the lithium batteries at a target temperature, or a self-discharge voltage drop value of the lithium batteries and the predicted discharge capacity at the target temperature, or the self-discharge voltage drop value of the lithium batteries and a conventional discharge capacity.
Preferably, the sorting method further comprises: obtaining the predicted discharge capacity of the lithium battery at the target temperature through the following steps:
respectively testing the discharge capacity of the lithium battery at different temperatures;
fitting a corresponding relation between the temperature and the discharge capacity of the lithium battery according to the discharge capacities at different temperatures;
obtaining a target temperature, and calculating and predicting discharge capacity according to the target temperature and the corresponding relation;
or the like, or, alternatively,
the sorting method further comprises: obtaining the predicted discharge capacity of the lithium battery at the target temperature through the following steps:
respectively testing the charge capacity and the discharge capacity of the lithium battery at different temperatures;
fitting the corresponding relationship between the temperature and the charging capacity and the corresponding relationship between the charging capacity and the discharging capacity of the lithium battery according to the discharging capacity and the charging capacity at different temperatures;
and acquiring a target temperature and a target charging capacity, and calculating the predicted discharging capacity according to the target temperature and the target charging capacity.
Preferably, the method further comprises the step of obtaining the self-discharge voltage drop value of the lithium battery by the following steps:
the lithium battery is charged in a constant current mode under a first charging current multiplying power so that the lithium battery is charged, and the charge quantity of the charged lithium battery is smaller than that of a full-charge state;
testing a first voltage of the lithium battery;
measuring a second voltage of the lithium battery after a first preset time;
calculating the self-discharge voltage drop of the lithium battery according to the first preset time, the first voltage and the second voltage;
and/or the presence of a gas in the gas,
the battery parameters further include a first voltage, the sorting method further includes obtaining the first voltage of the lithium battery by:
the lithium battery is charged in a constant current mode under a first charging current multiplying power so that the lithium battery is charged, and the charge quantity of the charged lithium battery is smaller than that of a full-charge state;
testing a first voltage of the lithium battery;
and/or the presence of a gas in the gas,
the battery parameters further comprise internal resistance, and the sorting method further comprises the following steps of:
the lithium battery is charged in a constant current mode under a first charging current multiplying power so that the lithium battery is charged, and the charge quantity of the charged lithium battery is smaller than that of a full-charge state;
and testing the internal resistance of the lithium battery.
Preferably, after the step of charging the lithium battery at a first charging current rate by a constant current, the step of charging the lithium battery with a current further includes:
and placing the charged lithium battery at normal temperature for a second preset time.
Preferably, the step of separately testing the discharge capacities of the lithium batteries at different temperatures includes:
presetting a discharge cut-off voltage;
under different temperatures, respectively discharging the lithium battery in a full-charge state to the discharge cut-off voltage at a constant current under a first discharge current multiplying power;
and obtaining the discharge capacity of the lithium battery.
Preferably, the step of separately testing the charging capacities of the lithium batteries at different temperatures includes:
presetting a charging cut-off voltage;
under different temperatures, respectively charging the lithium battery in an empty state to the charge cut-off voltage at a constant current and a constant voltage under a first charge current multiplying power;
and acquiring the charging capacity of the lithium battery.
Preferably, the step of separately testing the charging capacities of the lithium batteries at different temperatures further comprises: and forming the lithium battery.
Preferably, the step of forming the lithium battery further includes:
placing the lithium battery at normal temperature for a third preset time;
and acquiring the voltage of the lithium battery, judging whether the acquired voltage is lower than a low-voltage threshold value, if so, rejecting the lithium battery, and if not, executing the step of respectively testing the charging capacity of the lithium battery at different temperatures.
Preferably, before the step of sorting the lithium batteries into the corresponding energy storage systems according to the battery parameters of the lithium batteries, the method further includes:
presetting energy storage systems of different levels according to different ranges of battery parameters;
the step of sorting the lithium batteries into the corresponding energy storage systems according to the battery parameters of the lithium batteries comprises the following steps: and sorting the lithium batteries into energy storage systems of corresponding levels according to the battery parameters of the lithium batteries.
Preferably, before the step of sorting the lithium batteries into the corresponding energy storage systems according to the battery parameters of the lithium batteries, the method further includes:
presetting corresponding discharge cut-off voltage according to the type of the lithium battery;
and/or the presence of a gas in the gas,
and presetting corresponding charging cut-off voltage according to the type of the lithium battery.
The positive progress effects of the invention are as follows: according to the method, the lithium batteries can be sorted into the corresponding energy storage systems under the condition of meeting actual working conditions through the combination of different battery parameters of the predicted discharge capacity of the lithium batteries at the target temperature, the self-discharge voltage drop value of the lithium batteries and the predicted discharge capacity at the target temperature, and the self-discharge voltage drop value of the lithium batteries and the conventional discharge capacity.
According to the invention, the discharge capacities of the lithium batteries under actual conditions are respectively tested at different temperatures, the corresponding relation between the temperature and the discharge capacity of the lithium batteries can be fitted according to the tested data, and when the lithium batteries need to be sorted, the discharge capacity can be calculated and predicted according to the environment temperature to be used, namely the target temperature, of the lithium batteries and the fitted corresponding relation, so that the discharge capacities of the lithium batteries in the real use process can be predicted.
The invention can further take the voltage and the internal resistance of the lithium battery as the sorting basis, can further realize the accurate sorting of the lithium battery, and further improves the consistency of the energy storage system.
Drawings
Fig. 1 is a flowchart of a sorting method of a lithium battery according to embodiment 1 of the present invention.
Fig. 2 is a flow chart of the predicted discharge capacity obtained in one embodiment in example 1.
Fig. 3 is a flowchart of a specific implementation manner of step 111 in embodiment 1.
Fig. 4 is a flowchart of obtaining a predicted discharge capacity in another embodiment in example 1.
Fig. 5 is a flowchart of a specific implementation manner of the charging capacity test in step 121 in embodiment 1.
Fig. 6 is a flow chart of obtaining a self-discharge voltage drop value of a lithium battery in one embodiment in example 1.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a method for sorting lithium batteries, as shown in fig. 1, including:
and 11, sorting the lithium batteries into corresponding energy storage systems according to the battery parameters of the lithium batteries.
The battery parameters comprise predicted discharge capacity of the lithium battery at a target temperature, or a self-discharge voltage drop value of the lithium battery and the predicted discharge capacity at the target temperature, or the self-discharge voltage drop value of the lithium battery and a conventional discharge capacity.
In this embodiment, in order to sort the lithium batteries into the corresponding energy storage systems according to actual requirements, step 11 may further include: and step 10, presetting energy storage systems of different levels according to different ranges of battery parameters.
The step 11 specifically comprises: and sorting the lithium batteries into the energy storage systems of the corresponding levels according to the battery parameters of the lithium batteries.
In this embodiment, in the first case, when the battery parameter includes the predicted discharge capacity of the lithium battery at the target temperature, the energy storage systems of multiple levels are set according to different ranges of the predicted discharge capacity, for example, the predicted discharge capacity is a1～a2Middle time is the first level, at a2～a3Middle time second level … … at an～an+1Medium is the nth level. And obtaining the predicted discharge capacity according to the target temperature of the lithium battery, so that the grade corresponding to the predicted discharge capacity can be found to allocate the lithium battery to the corresponding energy storage system.
In the second case, when the battery parameters include the self-discharge voltage drop value of the lithium battery and the predicted discharge capacity at the target temperature, the energy storage system is set in multiple levels according to the combination of the self-discharge voltage drop value and the predicted discharge capacity, for example, the predicted discharge capacity is a1～a2The voltage drop value of the neutral and self-discharge is b1～b2The combination of (1) is a first level, and the predicted discharge capacity is a1～a2The voltage drop value of the neutral and self-discharge is b2～b3The combination of (1) is of the second order, and the predicted discharge capacity is a2～a3The voltage drop value of the neutral and self-discharge is b1～b2A third level … …, and so on. The predicted discharge capacity can be obtained according to the target temperature of the lithium battery, the self-discharge voltage drop value of the lithium battery can be obtained according to calculation, and the corresponding predicted discharge capacity can be found according to the obtained predicted discharge capacity and the self-discharge voltage drop valueTo distribute the lithium batteries into the corresponding energy storage systems.
In the third case, in the present embodiment, when the battery parameters include a self-discharge voltage drop value of the lithium battery and a conventional discharge capacity, the energy storage system is set in multiple levels according to a combination of the self-discharge voltage drop value and the conventional discharge capacity, where the conventional discharge capacity represents a discharge capacity in a conventional manner, such as a conventional temperature. And finding the grade corresponding to the predicted discharge capacity according to the self-discharge voltage drop value and the conventional discharge capacity of the lithium battery obtained by calculation so as to allocate the lithium battery to the corresponding energy storage system.
In this embodiment, can set up the different battery parameters of lithium cell, select separately the lithium cell to the energy storage system that corresponds the rank according to the combination of different battery parameters, and it is different with traditional sorting mode, in this embodiment, considered more actual sorting parameters, further improved the accuracy of selecting separately to and the uniformity of lithium cell in the energy storage system of each rank.
In this example, in a specific implementation manner, as shown in fig. 2, the predicted discharge capacity of the lithium battery at the target temperature is obtained by the following steps:
and 111, respectively testing the discharge capacity of the lithium battery at different temperatures.
In a specific embodiment, as shown in fig. 3, step 111 may specifically include:
and step 1111, presetting a discharge cut-off voltage.
And 1112, respectively discharging the lithium battery in the full-charge state to a discharge cut-off voltage at a constant current under the first discharge current multiplying power at different temperatures.
And step 1113, obtaining the discharge capacity of the lithium battery.
The corresponding discharge cutoff voltage can be preset according to the type of the lithium battery, for example, for the lithium iron phosphate battery, the discharge cutoff voltage is preset to be 2V, and for the ternary battery, the discharge cutoff voltage is preset to be 2.75V.
In this embodiment, thereby through predetermineeing the cutoff voltage that discharges, avoid damaging this lithium cell to the lithium cell excessive discharge, in this embodiment, still protected the lithium cell to a certain extent when sorting the lithium cell.
and 113, acquiring a target temperature, and calculating and predicting the discharge capacity according to the target temperature and the corresponding relation.
In this embodiment, discharge capacities of the lithium batteries under actual conditions are respectively tested at different temperatures, and a corresponding relationship between the temperature and the discharge capacity of the lithium batteries can be fitted according to the test data, when the lithium batteries are sorted according to needs, the discharge capacities of the lithium batteries in the real use process can be predicted according to the ambient temperature to be used of the lithium batteries, namely the target temperature, and the fitted corresponding relationship is calculated and predicted, so that the discharge capacities of the lithium batteries can be predicted.
In another specific embodiment, as shown in fig. 4, the predicted discharge capacity of the lithium battery at the target temperature is obtained by the following steps:
and step 121, respectively testing the charge capacity and the discharge capacity of the lithium battery at different temperatures.
In a specific embodiment, as shown in fig. 5, the charging capacity of the lithium battery can be obtained in step 121 by the following steps:
And 1212, respectively charging the lithium battery to a charging cut-off voltage at a constant current and a constant voltage under a second charging current multiplying power at different temperatures.
Specifically, in step 1212, the lithium battery in the empty state is charged to the charge cut-off voltage at the constant current and the constant voltage under the second charging current rate.
Wherein, before step 1213, the method may further comprise the steps of: 12121. and placing the charged lithium battery at normal temperature for a second preset time, so that the voltage of the lithium battery is stable, and a good balance degree is obtained.
The corresponding charging cut-off voltage can be preset according to the type of the lithium battery, for example, the charging cut-off voltage of the lithium iron phosphate battery is preset to be 3.65V, and for the ternary battery, the charging cut-off voltage of the ternary battery is preset to be 4.2V, and further, the charging cut-off current of the different batteries can be preset, for example, for the ternary battery, the charging cut-off current of the ternary battery can be preset to be 0.05C.
In this embodiment, thereby avoid damaging this lithium cell to lithium cell overcharge through predetermineeing the cut-off voltage that charges, in this embodiment, further protected the lithium cell when sorting the lithium cell.
and step 123, acquiring the target temperature and the target charging capacity, and calculating and predicting the discharging capacity according to the target temperature and the target charging capacity.
In the embodiment, the charging capacity and the discharging capacity of the lithium battery under the actual condition are respectively tested at different temperatures, the corresponding relation between the temperature and the charging capacity and the discharging capacity of the lithium battery can be fitted according to the tested data, and when the lithium battery needs to be sorted, the discharging capacity can be calculated and predicted according to the environment temperature to be used of the lithium battery, namely the target temperature, the target charging capacity and the fitted corresponding relation, so that the discharging capacity of the lithium battery in the real use process can be predicted.
In this embodiment, as shown in fig. 6, the self-discharge voltage drop value of the lithium battery is obtained by the following steps:
and step 131, charging the lithium battery at a constant current under the first charging current multiplying power so as to charge the lithium battery, wherein the charge quantity of the charged lithium battery is smaller than that of the full-charge state.
and step 134, calculating the self-discharge voltage drop of the lithium battery according to the first preset time, the first voltage and the second voltage.
Specifically, in step 134, the self-discharge voltage drop of the lithium battery may be obtained by dividing the difference between the first voltage and the second voltage by the first preset time.
In this embodiment, in a specific implementation manner, the battery parameter further includes a first voltage, and specifically, the first voltage may be obtained through step 131 and step 132.
In this embodiment, in a specific implementation manner, the battery parameters further include internal resistance, and the sorting method further includes the following steps of:
specifically, the internal resistance of the lithium battery may be further tested after step 131.
In this embodiment, the battery parameters further include the first voltage of lithium cell, the internal resistance of lithium cell, and specific before sorting the lithium cell, can predetermine the combination that each battery parameter formed the energy storage system of different grades, when sorting the lithium cell, can test the battery parameter that the lithium cell corresponds to select the lithium cell to the energy storage system that corresponds the grade according to the test result in, thereby further improved the sorting precision of lithium cell, strengthened the uniformity that corresponds each lithium cell in the energy storage system of grade.
In this embodiment, as shown in fig. 4, the method may further include forming a lithium battery by using the lithium battery formation method, and the lithium battery can be infiltrated and activated by forming the lithium battery, so that the subsequent sorting step is easier to perform, and the sorting result is more accurate.
As shown in fig. 4, in this embodiment, after 001, the method may further include:
and 002, placing the lithium battery at normal temperature for a third preset time.
And step 003, obtaining the voltage of the lithium battery.
And 004, judging whether the acquired voltage is lower than a low-voltage threshold value, if so, executing a step 005, and if not, executing a step 121 to test the charging capacity of the lithium battery.
And 005, rejecting the lithium battery.
In this embodiment, after the lithium battery is formed, the lithium battery is placed at normal temperature for the third preset time, so that the lithium battery can be restored to the normal temperature, the voltage state of the lithium battery is stabilized, the lithium battery which does not meet the requirement can be removed in advance by removing the lithium battery which is lower than the low-voltage threshold value, and the subsequent efficiency of sorting the lithium battery is improved.
In order to better understand the method for sorting lithium batteries in this embodiment, the following describes this embodiment with a specific scenario:
first, step 001 is executed to perform battery formation, specifically, charging for 3h (hours) with a constant current of 0.1C, it should be understood that in other scenarios, charging with a constant current in the interval of 0.05C-0.5C may be performed, wherein the larger the current used, the shorter the charging time, and the smaller the current used, the longer the charging time. After formation of the battery, step 002 is performed at a high temperature as follows: standing for 6-48h at 40-60 ℃, and recording the first charging capacity at the moment. And then, standing the lithium battery for 2-12h at normal temperature, putting the lithium battery in a grading cabinet, standing for 5-30min (min) to execute the step 003-.
And then, charging and discharging the battery in a thermostat at 0-60 ℃ at intervals of 5 ℃, specifically, firstly executing step 121, performing constant-current and constant-voltage charging on the battery by adopting 0.1-0.5C current, performing voltage-limiting and current-limiting charging on different battery types by preset charging cut-off voltage and charging cut-off current so as to fully charge the lithium battery, and standing for 5-30min after the lithium battery is fully charged, stabilizing the voltage and obtaining a second charging capacity of the lithium battery. And then, carrying out constant current discharge on the battery by adopting a current of 0.1-0.5C until the lithium battery reaches a discharge cut-off voltage, and recording the discharge capacity.
In one case, the discharge capacity Cy versus temperature can be directly fit, i.e., y ═ f (Cy, t), where t represents temperature and y represents discharge capacity at temperature t. In this case, when the lithium battery is specifically sorted, the target temperature may be obtained first, and the target temperature is substituted into the above formula to obtain the discharge capacity, so that the lithium battery is sorted according to the discharge capacity.
In the second case, the relationship of the discharge capacity Cy to the charge capacity Cx and the temperature can be fitted: and y is f (Cy, t, Cx), wherein Cx represents a charge capacity, Cy represents a discharge capacity, t represents a temperature, and y represents a discharge capacity at the temperature t and the charge capacity of Cx. In this case, when the lithium battery is specifically sorted, the target temperature and the target charging capacity may be obtained first, and the target temperature and the target charging capacity are substituted into the above formula to obtain the discharging capacity, so that the lithium battery is sorted according to the discharging capacity.
Further, under the specific scenario, other battery parameters of the lithium battery can be further measured to realize more accurate capacity grading, specifically, after the foregoing steps, step 131 and step 134 can be further performed, specifically, the lithium battery is charged with 5% -50% of SOC by using 0.1C-0.5C constant current charging for 30min, the lithium battery is left at 10-35 ℃ for 12-24h, and the first voltage and the internal resistance of the lithium battery at this time are measured. The first voltage and the internal resistance can be used as one of the battery parameters to sort the lithium batteries.
And then, standing the lithium battery at the temperature of 10-35 ℃ for 3-10 days, measuring a second voltage of the lithium battery, and dividing the second voltage subtracted from the first voltage by the number of days of standing so as to obtain a self-discharge voltage drop K value of the battery.
And (3) integrating the predicted discharge capacity, the internal resistance, the first voltage and the voltage drop K value at the target temperature, and sorting the batteries into energy storage systems of corresponding levels, wherein the difference between the upper level and the lower level of the predicted discharge capacity is 0.5-2%, the difference between the upper level and the lower level of the first voltage is 10-50mV, the difference between the upper level and the lower level of the internal resistance is 0.05-0.2m omega, and the difference between the upper level and the lower level of the K value is 0.5-3 mV/day, and the sorting basis can be used.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A sorting method of a lithium battery is characterized by comprising the following steps:
and sorting the lithium batteries into corresponding energy storage systems according to battery parameters of the lithium batteries, wherein the battery parameters comprise predicted discharge capacity of the lithium batteries at a target temperature, or a self-discharge voltage drop value of the lithium batteries and the predicted discharge capacity at the target temperature, or the self-discharge voltage drop value of the lithium batteries and a conventional discharge capacity.
2. The method for sorting a lithium battery according to claim 1, further comprising: obtaining the predicted discharge capacity of the lithium battery at the target temperature through the following steps:
respectively testing the discharge capacity of the lithium battery at different temperatures;
fitting a corresponding relation between the temperature and the discharge capacity of the lithium battery according to the discharge capacities at different temperatures;
obtaining a target temperature, and calculating and predicting discharge capacity according to the target temperature and the corresponding relation;
or the like, or, alternatively,
the sorting method further comprises: obtaining the predicted discharge capacity of the lithium battery at the target temperature through the following steps:
respectively testing the charge capacity and the discharge capacity of the lithium battery at different temperatures;
fitting the corresponding relationship between the temperature and the charging capacity and the corresponding relationship between the charging capacity and the discharging capacity of the lithium battery according to the discharging capacity and the charging capacity at different temperatures;
and acquiring a target temperature and a target charging capacity, and calculating the predicted discharging capacity according to the target temperature and the target charging capacity.
3. The method for sorting lithium batteries according to claim 1, further comprising obtaining the self-discharge voltage drop value of the lithium battery by:
the lithium battery is charged in a constant current mode under a first charging current multiplying power so that the lithium battery is charged, and the charge quantity of the charged lithium battery is smaller than that of a full-charge state;
testing a first voltage of the lithium battery;
measuring a second voltage of the lithium battery after a first preset time;
calculating the self-discharge voltage drop of the lithium battery according to the first preset time, the first voltage and the second voltage;
and/or the presence of a gas in the gas,
the battery parameters further include a first voltage, the sorting method further includes obtaining the first voltage of the lithium battery by:
the lithium battery is charged in a constant current mode under a first charging current multiplying power so that the lithium battery is charged, and the charge quantity of the charged lithium battery is smaller than that of a full-charge state;
testing a first voltage of the lithium battery;
and/or the presence of a gas in the gas,
the battery parameters further comprise internal resistance, and the sorting method further comprises the following steps of:
the lithium battery is charged in a constant current mode under a first charging current multiplying power so that the lithium battery is charged, and the charge quantity of the charged lithium battery is smaller than that of a full-charge state;
and testing the internal resistance of the lithium battery.
4. The method for sorting lithium batteries according to claim 3, wherein the step of charging the lithium batteries at a first charging current rate with a constant current to charge the lithium batteries further comprises:
and placing the charged lithium battery at normal temperature for a second preset time.
5. The method for sorting lithium batteries according to claim 2, wherein the step of separately testing the discharge capacities of the lithium batteries at different temperatures comprises:
presetting a discharge cut-off voltage;
under different temperatures, respectively discharging the lithium battery in a full-charge state to the discharge cut-off voltage at a constant current under a first discharge current multiplying power;
and obtaining the discharge capacity of the lithium battery.
6. The method for sorting lithium batteries according to claim 2, wherein the step of separately testing the charge capacities of the lithium batteries at different temperatures comprises:
presetting a charging cut-off voltage;
under different temperatures, respectively charging the lithium battery in an empty state to the charge cut-off voltage at a constant current and a constant voltage under a first charge current multiplying power;
and acquiring the charging capacity of the lithium battery.
7. The method for sorting lithium batteries according to claim 2, wherein the step of separately testing the charging capacities of the lithium batteries at different temperatures further comprises: and forming the lithium battery.
8. The method for sorting lithium batteries according to claim 7, wherein said step of forming said lithium batteries further comprises:
placing the lithium battery at normal temperature for a third preset time;
and acquiring the voltage of the lithium battery, judging whether the acquired voltage is lower than a low-voltage threshold value, if so, rejecting the lithium battery, and if not, executing the step of respectively testing the charging capacity of the lithium battery at different temperatures.
9. The method for sorting lithium batteries according to claim 1, wherein the step of sorting lithium batteries into corresponding energy storage systems according to battery parameters of the lithium batteries further comprises:
presetting energy storage systems of different levels according to different ranges of battery parameters;
the step of sorting the lithium batteries into the corresponding energy storage systems according to the battery parameters of the lithium batteries comprises the following steps: and sorting the lithium batteries into energy storage systems of corresponding levels according to the battery parameters of the lithium batteries.
10. The method for sorting lithium batteries according to claim 1, wherein the step of sorting lithium batteries into corresponding energy storage systems according to battery parameters of the lithium batteries further comprises:
presetting corresponding discharge cut-off voltage according to the type of the lithium battery;
and/or the presence of a gas in the gas,
and presetting corresponding charging cut-off voltage according to the type of the lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110541189.5A CN113275271B (en) | 2021-05-18 | 2021-05-18 | Sorting method of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110541189.5A CN113275271B (en) | 2021-05-18 | 2021-05-18 | Sorting method of lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113275271A true CN113275271A (en) | 2021-08-20 |
| CN113275271B CN113275271B (en) | 2022-10-04 |
Family
ID=77279711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110541189.5A Active CN113275271B (en) | 2021-05-18 | 2021-05-18 | Sorting method of lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113275271B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115805194A (en) * | 2022-05-25 | 2023-03-17 | 宁德时代新能源科技股份有限公司 | Battery monomer sorting method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037986A (en) * | 2010-08-19 | 2013-04-10 | 索利斯蒂克有限公司 | Postal sorting machine including gripping conveying means, and method for implementing same |
| CN107732337A (en) * | 2017-10-18 | 2018-02-23 | 中航锂电（洛阳）有限公司 | A kind of retired battery module method for separating |
| CN109002892A (en) * | 2018-05-30 | 2018-12-14 | 江苏理工学院 | A kind of implementation method for improving DE-GWO algorithm |
| CN110165319A (en) * | 2019-06-10 | 2019-08-23 | 河南福森新能源科技有限公司 | A kind of method for separating of high-capacity lithium battery self-discharge performance |
| CN111029668A (en) * | 2019-11-25 | 2020-04-17 | 江西恒动新能源有限公司 | Matching method of lithium ion power batteries |
| CN111257782A (en) * | 2020-03-28 | 2020-06-09 | 深圳赛骄阳能源科技股份有限公司 | Lithium ion battery cycle life evaluation and prediction method |
-
2021
- 2021-05-18 CN CN202110541189.5A patent/CN113275271B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037986A (en) * | 2010-08-19 | 2013-04-10 | 索利斯蒂克有限公司 | Postal sorting machine including gripping conveying means, and method for implementing same |
| CN107732337A (en) * | 2017-10-18 | 2018-02-23 | 中航锂电（洛阳）有限公司 | A kind of retired battery module method for separating |
| CN109002892A (en) * | 2018-05-30 | 2018-12-14 | 江苏理工学院 | A kind of implementation method for improving DE-GWO algorithm |
| CN110165319A (en) * | 2019-06-10 | 2019-08-23 | 河南福森新能源科技有限公司 | A kind of method for separating of high-capacity lithium battery self-discharge performance |
| CN111029668A (en) * | 2019-11-25 | 2020-04-17 | 江西恒动新能源有限公司 | Matching method of lithium ion power batteries |
| CN111257782A (en) * | 2020-03-28 | 2020-06-09 | 深圳赛骄阳能源科技股份有限公司 | Lithium ion battery cycle life evaluation and prediction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115805194A (en) * | 2022-05-25 | 2023-03-17 | 宁德时代新能源科技股份有限公司 | Battery monomer sorting method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113275271B (en) | 2022-10-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109856559B (en) | Lithium battery cycle life prediction method | |
| CN107991623B (en) | Battery ampere-hour integral SOC estimation method considering temperature and aging degree | |
| CN106291372B (en) | A kind of new lithium-ion-power cell method for predicting residual useful life | |
| CN107015157B (en) | The lithium battery cycles left service life online fast test method of segment is risen based on constant current equipressure | |
| CN112464571B (en) | Lithium battery pack parameter identification method based on multi-constraint-condition particle swarm optimization algorithm | |
| EP2490034B1 (en) | Storage battery device, storage battery state of charge evaluation device and method | |
| CN103163480B (en) | The appraisal procedure of lithium battery health status | |
| CN108919129A (en) | When a kind of under variable working condition power battery life-span prediction method | |
| CN107728072A (en) | A kind of method for quick predicting of cycle life of lithium ion battery | |
| CN106093778A (en) | Battery status Forecasting Methodology and system | |
| CN106885994B (en) | Lithium battery remaining life fast detection method based on constant-voltage charge segment | |
| CN101860056A (en) | Power lithium battery pack balancing and managing system based on Map model | |
| CN103698716A (en) | Attenuation coefficient-based method for evaluating dischargeable electric quantity of series battery pack | |
| CN110320472B (en) | Self-correction SOC estimation method for mining lithium battery | |
| CN108732499B (en) | Method and system for detecting cycle life of lithium ion battery | |
| CN104237802A (en) | Detection method for low-temperature performance uniformity of lithium ion batteries | |
| CN107024664A (en) | Lithium battery residual life fast prediction method based on constant-current charge fragment | |
| CN103278777A (en) | Method for estimating health status of lithium battery on basis of dynamic Bayesian network | |
| CN101614793B (en) | Method for evaluating consistency of batteries | |
| CN111123120A (en) | Method for measuring self-discharge current of lithium ion battery | |
| CN113275271B (en) | Sorting method of lithium battery | |
| CN115047347A (en) | Method for judging residual electric quantity of underwater vehicle battery under dynamic load current | |
| CN110988722A (en) | Method for rapidly detecting residual energy of lithium ion battery | |
| CN104793145A (en) | Rapid detection method for available capacity of battery | |
| CN106597314A (en) | Vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |