CN117783861A - Self-discharge current determining method, device, equipment and storage medium - Google Patents
Self-discharge current determining method, device, equipment and storage medium Download PDFInfo
- Publication number
- CN117783861A CN117783861A CN202311873625.4A CN202311873625A CN117783861A CN 117783861 A CN117783861 A CN 117783861A CN 202311873625 A CN202311873625 A CN 202311873625A CN 117783861 A CN117783861 A CN 117783861A
- Authority
- CN
- China
- Prior art keywords
- current
- discharge
- charging
- discharging
- constant
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000007599 discharging Methods 0.000 claims abstract description 132
- 238000007600 charging Methods 0.000 claims abstract description 99
- 238000012360 testing method Methods 0.000 claims abstract description 86
- 238000010277 constant-current charging Methods 0.000 claims abstract description 74
- 238000004590 computer program Methods 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 description 20
- 238000004891 communication Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 238000002484 cyclic voltammetry Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Secondary Cells (AREA)
Abstract
The invention discloses a self-discharge current determining method, a device, equipment and a storage medium, wherein the method comprises the following steps: carrying out constant-current charging and constant-current discharging on the first battery pack by adopting current with a preset current value to obtain first constant-current charging test data and first constant-current discharging test data; carrying out constant-current charging and constant-current discharging on the second battery pack by adopting a current with a preset current value to obtain second constant-current charging test data and second constant-current discharging test data; determining energy loss according to the first charging current, the first charging time, the first discharging current and the first discharging time; and determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the energy loss.
Description
Technical Field
The embodiment of the invention relates to a battery technology, in particular to a self-discharge current determining method, a device, equipment and a storage medium.
Background
The self-discharge of the lithium ion battery is an important index for influencing the performance of the battery, and in the prior art, the voltage drop and the capacity of the battery can be compared through tests such as K value, high-temperature storage and the like; alternatively, the self-discharge evaluation may be performed by a snap-on cyclic voltammetry test or the like. The self-discharge test needs to consider factors such as the self-discharge misjudgment rate of a production line, the production scale and the beat of a battery, the storage time of the self-discharge test of the battery, the storage cost related to the self-discharge occupied space of the battery, the site cost, the fund return rate for battery delay use or the occupation cost, and the like.
In view of the above, the above-mentioned test method has strict requirements on equipment, high test cost and complicated operation, and a test method with low cost, strong operability and capable of accurately determining the self-discharge current is needed.
Disclosure of Invention
The invention provides a self-discharge current determining method, a device, equipment and a storage medium, so as to achieve the purposes of accurately determining the self-discharge current, along with low cost and strong operability.
In a first aspect, an embodiment of the present invention provides a self-discharge current determining method, including:
carrying out constant-current charging and constant-current discharging on the first battery pack by adopting current with a preset current value to obtain first constant-current charging test data and first constant-current discharging test data;
determining a first charging current and a first charging time according to the first constant current charging test data, and determining a first discharging current and a first discharging time according to the first constant current discharging test data;
determining energy loss according to the first charging current, the first charging time, the first discharging current and the first discharging time;
carrying out constant current charging and constant current discharging on the second battery pack by adopting a current with a preset current value to obtain second constant current charging test data and second constant current discharging test data;
determining a second charging current and a second charging time according to the second constant current charging test data, and determining a second discharging current and a second discharging time according to the second constant current discharging test data;
and determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the energy loss.
Optionally, the performing the constant current charging and discharging with respect to the first battery pack and/or the second battery pack includes:
standing for 10-30 min;
discharging by adopting current of at most 0.02C, and controlling to stop discharging when the first cut-off voltage is reached;
standing for 10-60 min;
charging with a current of at most 0.02C, and controlling to stop discharging when the second cut-off voltage is reached;
standing for 10-60 min;
discharging is performed by adopting current of at most 0.02C, and discharging is stopped under the condition that the first cut-off voltage is reached.
Optionally, the value range of the preset current value is 0.01-0.02 ℃.
Alternatively, the energy loss is determined using the formula:
Q sh ＝(I c_1 t c_1 -I d_1 t d_1 )/2
in which Q sh For energy loss, I c_1 For a first charging current, t c_1 For the first charging time, I d_1 For a first discharge current, t d_1 Is the first discharge time.
Alternatively, the formula used to determine the self-discharge current is:
I z ＝(I c_2 t c_2 -I d_2 t d_2 -2Q sh )/(t d_2 +t c_2 )
wherein I is z For self-discharge current, I c_2 For the second charging electricityFlow, t c_2 For the second charging time, I d_2 Is the second discharge current, t d_2 Is the second discharge time.
Optionally, determining the energy loss according to the first charge capacity and the first discharge capacity includes:
determining the energy loss of a plurality of first battery packs, determining the average value of the energy loss, and recording the average value as the average energy loss;
and determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the average energy loss.
Optionally, the method further comprises the step of controlling the ambient temperature to be a designated temperature when constant-current charging and constant-current discharging are performed.
In a second aspect, an embodiment of the present invention further provides a self-discharge current determining device, including a self-discharge current determining unit, where the self-discharge current determining unit includes a charge-discharge module and a calculation module;
the charging and discharging module is used for:
carrying out constant-current charging and constant-current discharging on the first battery pack by adopting current with a preset current value to obtain first constant-current charging test data and first constant-current discharging test data;
carrying out constant current charging and constant current discharging on the second battery pack by adopting a current with a preset current value to obtain second constant current charging test data and second constant current discharging test data;
the computing module is used for:
determining a first charge capacity according to the first constant current charge test data, and determining a first discharge capacity according to the first constant current discharge test data;
determining energy loss according to the first charging capacity and the first discharging capacity;
determining a second charging capacity and a second charging time according to the second constant current charging test data, and determining a second discharging capacity and a second discharging time according to the second constant current discharging test data;
and determining the self-discharge current of the second battery pack according to the second charge capacity, the charge time, the second discharge capacity, the discharge time and the energy loss.
In a third aspect, an embodiment of the present invention further provides an electronic device, including at least one processor, and a memory communicatively connected to the at least one processor;
the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform any one of the self-discharge current determination methods described in the embodiments of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium, where computer instructions are stored, where the computer instructions are configured to cause a processor to implement any one of the self-discharge current determining methods described in the embodiments of the present invention when executed.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a self-discharge current determining method, in the method, constant-current charge and discharge are respectively carried out on a first battery pack and a second battery pack by using current with preset current values, so that when the self-discharge current calculation is carried out by using charge and discharge parameters obtained in the charge and discharge process, the battery polarization problem can be ignored, the difficulty in the self-discharge current calculation is reduced, meanwhile, the energy loss is determined by using the charge and discharge parameters of the first battery pack, the self-discharge current of the battery pack with the self-discharge problem is determined by using the energy loss and the charge and discharge parameters of the second battery pack, the difficulty in parameter acquisition can be reduced based on the respectively acquired charge and discharge parameters of the first battery pack and the second battery pack, the measurement operation is convenient, and meanwhile, the self-discharge current of the second battery pack is determined by using the energy loss calculated by the first battery pack, the second charge current, the second charge time, the second charge current and the second discharge time, so that the self-discharge current of the battery is difficult to quantitatively calculate is effectively solved.
Drawings
FIG. 1 is a flow chart of a self-discharge current determination method in an embodiment;
the self-discharge current determination apparatus in the embodiment of fig. 2 is a schematic diagram;
fig. 3 is a schematic diagram of the electronic device structure in the embodiment.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a self-discharge current determination method in an embodiment, and referring to fig. 1, the self-discharge current determination method includes:
s101, carrying out constant-current charging and constant-current discharging on a first battery pack by adopting current with a preset current value, and obtaining first constant-current charging test data and first constant-current discharging test data.
In this embodiment, the first battery pack is set as a normal battery pack, and state parameters (for example, charging current, discharging current, charging capacity, discharging capacity, charging cut-off voltage, discharging cut-off voltage, open circuit voltage, etc.) of the normal battery pack in the charging and discharging processes are set to be the same as the calibrated reference parameters, and meanwhile, it is determined that the normal battery pack has no self-discharging phenomenon.
S102, determining a first charging current and a first charging time according to first constant current charging test data, and determining a first discharging current and a first discharging time according to first constant current discharging test data.
For example, in the present solution, the first constant current charging test data may include a first charging current (data) and a first charging time (data);
setting a first charging current as a charging current average value determined through measurement and calculation when the first battery pack is subjected to constant current charging, wherein in the constant current charging process, charging current data can be acquired every 1-5 s, and then the charging current average value is calculated;
setting a first charging time as an elapsed time from a set starting state to when the first battery pack is charged to meet a charge cutoff condition, and when the charging process includes a plurality of charging cycles, the first charging time may be an average value calculated based on a charging time corresponding to each charging cycle;
the first constant current discharge test data may include a first discharge current (data) and a first discharge time (data);
setting a first discharge current as a discharge current average value determined through measurement and calculation when the first battery pack is subjected to constant current discharge, wherein in the constant current discharge process, discharge current data can be acquired every 1-5 s, and then the discharge current average value is calculated;
the first discharge time is set to be a time elapsed when the first battery pack is discharged from the set start state to the discharge cutoff condition is satisfied, and when the discharge process includes a plurality of discharge cycles, the first discharge time may be an average value calculated based on the discharge time corresponding to each discharge cycle.
S103, determining energy loss according to the first charging current, the first charging time, the first discharging current and the first discharging time.
In this embodiment, the energy loss calculation function may be determined by a simulation test or empirically, and the energy loss may be determined by taking the first charge current, the first charge time, the first discharge current, and the first discharge time as inputs and outputting the energy loss based on the energy loss calculation function.
S104, carrying out constant-current charging and constant-current discharging on the second battery pack by adopting current with a preset current value, and obtaining second constant-current charging test data and second constant-current discharging test data.
In this embodiment, the first battery pack and the second battery pack are set to be the same in model, and the second battery pack is set to be a battery pack having a self-discharge phenomenon.
In this embodiment, the preset current value is set to be less than or equal to 0.02C.
In combination with step S101 and step S104, in this embodiment, the parameter type included in the constant current charging test data (including the first constant current charging test data or the second constant current charging test data) may be set according to requirements, for example, it may include any multiple of parameters such as charging process voltage, charging current, charging energy, charging absolute time, charging relative time, and temperature;
the type of parameters included in the constant current discharge test data (including the first constant current discharge test data or the second constant current discharge test data) may be set according to requirements, and for example, it may include any of a plurality of parameters such as a discharge process voltage, a discharge current, a discharge energy, an absolute time of discharge, a discharge relative time, and a temperature.
In combination with step S101 and step S104, in this embodiment, the specific operation flow of constant current charging is not limited, and the specific operation flow of constant current discharging is not limited, which can be freely set according to the actual test requirement;
for example, the charge cutoff condition, the discharge cutoff condition, the ambient temperature, the number of charge and discharge cycles, and the like may be set according to the need.
S105, determining a second charging current and a second charging time according to the second constant current charging test data, and determining a second discharging current and a second discharging time according to the second constant current discharging test data.
For example, in the present solution, the second constant current charging test data may include a second charging current (data) and a second charging time (data);
setting a second charging current as a charging current average value determined through measurement and calculation when the second battery pack is subjected to constant current charging, wherein in the constant current charging process, charging current data can be acquired every 1-5 s, and then the charging current average value is calculated;
setting a second charging time as an elapsed time from a set start state to when the second battery pack is charged to meet a charge cutoff condition, and when the charging process includes a plurality of charging cycles, the second charging time may be an average value calculated based on a charging time corresponding to each charging cycle;
the second constant current discharge test data may include a second discharge current (data) and a second discharge time (data);
setting a second discharge current as a discharge current average value determined through measurement and calculation when the second battery pack is subjected to constant current discharge, wherein in the constant current discharge process, discharge current data can be acquired every 1-5 s, and then the discharge current average value is calculated;
the second discharge time is set to be a time elapsed when the second battery pack is discharged from the set start state to the discharge cutoff condition is satisfied, and when the discharge process includes a plurality of discharge cycles, the second discharge time may be an average value calculated based on the discharge time corresponding to each discharge cycle.
S106, determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the energy loss.
In this embodiment, the self-discharge current calculation function may be determined by a simulation test or empirically, and the second charge current, the second charge time, the second discharge current, the second discharge time, and the energy loss (calculated in step S105) may be determined as inputs and the self-discharge current may be determined as outputs based on the self-discharge current calculation function.
In this embodiment, the execution sequence of steps S101 to S106 may be freely adjusted according to needs, for example, the self-discharge current determining method may be implemented according to the following procedures:
s104, S105, S101 to S103, (execution after energy loss is obtained in execution S103) S106; alternatively, the settings S101 and S104 are executed simultaneously, and S102, S103, S105, and S106 are executed as needed after the execution of S101 and S104 is completed.
In this embodiment, the self-discharge current determination method may be applied to self-discharge current determination of a cylindrical lithium ion battery, or may be applied to self-discharge current determination of other types of batteries.
The embodiment provides a self-discharge current determining method, in the method, constant-current charge and discharge are respectively carried out on a first battery pack and a second battery pack by using current with preset current values, so that when self-discharge current calculation is carried out by using charge and discharge parameters obtained in the charge and discharge process, the battery polarization problem can be ignored, the difficulty in self-discharge current calculation is reduced, meanwhile, constant-current charge and discharge is carried out on the battery pack by using current with preset current values, the constant-current charge and discharge can be realized by adopting common charge and discharge equipment, the measurement range covers the normal use voltage range of the battery, the test cost is low, and the operation is simple;
in addition, firstly, the charge and discharge parameters of the first battery pack are determined, the energy loss is determined by using the charge and discharge parameters of the first battery pack, then the charge and discharge parameters of the second battery pack are determined, and the self-discharge current of the battery pack (the second battery pack) with the self-discharge problem is determined by using the energy loss and the charge and discharge parameters of the second battery pack, so that the difficulty in parameter acquisition can be reduced, the measurement operation is convenient, and the problem that the self-discharge current of the battery is difficult to quantitatively calculate is effectively solved.
Based on the scheme shown in fig. 1, in one possible embodiment, the constant-current charging and discharging processes can be replaced by constant-current constant-voltage charging and discharging;
at this time, the first charging current, the first charging time, the first discharging current, and the first discharging time are replaced with a first constant current charging current, a first constant current charging time, a first constant current discharging current, and a first constant current discharging time, respectively;
the second charging current, the second charging time, the second discharging current and the second discharging time are replaced by a second constant current charging current, a second constant current charging time, a second constant current discharging current and a second constant current discharging time respectively;
determining energy loss according to the first constant current charging current, the first constant current charging time, the first constant current discharging current and the first constant current discharging time;
and determining the self-discharge current of the second battery pack according to the second constant-current charging current, the second constant-current charging time, the second constant-current discharging current, the second constant-current discharging time and the energy loss.
Based on the scheme shown in fig. 1, in one possible embodiment, performing constant current charging and discharging with respect to the first battery pack and/or the second battery pack includes:
standing for 10-30 min;
discharging by adopting current of at most 0.02C, and controlling to stop discharging when the first cut-off voltage is reached;
standing for 10-60 min;
charging with a current of at most 0.02C, and controlling to stop discharging when the second cut-off voltage is reached;
standing for 10-60 min;
the discharge is performed with a current of at most 0.02C, and the discharge is controlled to be stopped when the first cutoff voltage is reached.
In this scheme, for the first battery pack and the second battery pack, the constant current charging process is the same, and the constant current discharging process is the same.
In the scheme, the battery pack is set to start discharging from a full-charge state, and the discharging is stopped when the voltage of the battery pack reaches a first cut-off voltage;
and setting the battery pack to start charging from the first cut-off voltage, and stopping charging when the voltage of the battery pack reaches the second cut-off voltage.
The first cut-off voltage, the second cut-off voltage, and the like may be determined empirically or by calibration tests, for example, according to the type of the battery pack.
Based on the scheme shown in FIG. 1, in one possible embodiment, the value range of the applied current is set to be 0.01C to 0.02C (relative current), or 0.01A to 0.05A (absolute current).
Based on the scheme shown in fig. 1, in one possible embodiment, the formula used to determine the energy loss is set as:
Q sh ＝(I c_1 t c_1 -I d_1 t d_1 )/2
in which Q sh For energy loss, I c_1 For a first charging current, t c_1 For the first charging time, I d_1 For a first discharge current, t d_1 Is the first discharge time.
Illustratively, on the basis of the scheme shown in fig. 1, the battery pack is charged and discharged by a small current, the battery polarization is small, the depolarization process is ignored, the self-discharge current is ignored for a normal battery (first battery pack), and the energy loss is considered to be available:
I c_1 t c_1 -Q sh ＝I d_1 t d_1 +Q sh
the above-mentioned modifications can be used to obtain:
Q sh ＝(I c_1 t c_1 -I d_1 t d_1 )/2
further, based on the scheme for determining energy loss using the above formula, in one possible embodiment, the formula used for determining the self-discharge current is:
I z ＝(I c_2 t c_2 -I d_2 t d_2 -2Q sh )/(t d_2 +t c_2 )
wherein I is z For self-discharge current, I c_2 For a second charging current, t c_2 For the second charging time, I d_2 Is the second discharge current, t d_2 Is the second discharge time.
Illustratively, in this embodiment, when the battery pack has a self-discharge phenomenon, it is set that:
(I c_2 -I z )t c_2 -Q sh ＝(I d_2 +I z )t d_2 +Q sh
the deformation of the above formula can be obtained:
I z ＝(I c_2 t c_2 -I d_2 t d_2 -2Q sh )/(t d_2 +t c_2 )
based on the scheme shown in fig. 1, in one possible embodiment, determining the energy loss according to the first charge capacity, the first discharge capacity includes:
determining the energy loss of a plurality of first battery packs, determining the average value of the energy loss, and recording the average value as the average energy loss;
and determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the average energy loss.
In this solution, at least three first battery packs may be taken to perform constant current charging and constant current discharging, and energy loss of each first battery pack may be determined respectively, so as to determine corresponding average energy loss.
Based on the scheme shown in fig. 1, in one possible embodiment, the self-discharge current determining method further includes controlling the ambient temperature to a specified temperature when constant-current charging and constant-current discharging are performed.
Illustratively, the purpose of controlling the ambient temperature to a specified temperature is to: and simulating a high-temperature storage process through the externally applied temperature, and further performing self-discharge evaluation at the designated temperature.
Illustratively, in one possible embodiment, the self-discharge current determining method includes:
s101, carrying out constant-current charging and constant-current discharging on a first battery pack by adopting current of at most 0.02C to obtain first constant-current charging test data and first constant-current discharging test data.
In this scheme, the first constant current charging test data is set to include a first charging current and a first charging time; the first constant-current discharge test data is set to comprise a first discharge current and a first discharge time.
S102, carrying out constant-current charging and constant-current discharging on the second battery pack by adopting current of at most 0.02C to obtain second constant-current charging test data and second constant-current discharging test data.
In combination with step S101 and step S102, in this solution, setting constant current charging and constant current discharging specifically includes:
standing for 10-30 min;
discharging by adopting a current of 0.01-0.02C relative current or 0.01-0.05A absolute current, and controlling to stop discharging when reaching a first cut-off voltage;
standing for 10-60 min;
charging by adopting a current of 0.01-0.02C relative current or 0.01-0.05A absolute current, and controlling to stop discharging when reaching a second cut-off voltage;
standing for 10-60 min;
and discharging by adopting a current of 0.01-0.02C relative current or 0.01-0.05A absolute current, and controlling to stop discharging when the first cut-off voltage is reached.
In the scheme, in the set process steps of constant current charging and constant current discharging, data are acquired every 1-5 s, and parameters such as voltage, current, capacity, energy, absolute time, relative time and temperature in the charging and discharging process of the battery are acquired;
the corresponding parameter types are respectively divided into first constant current charging test data, first constant current discharging test data, second constant current charging test data and second constant current discharging test data.
S103, determining a first charging current and a first charging time according to the first constant current charging test data, and determining a first discharging current and a first discharging time according to the first constant current discharging test data.
S104, determining energy loss according to the first charging current, the first charging time, the first discharging current and the first discharging time.
In this scheme, the energy loss is determined according to the following formula:
Q sh ＝(I c_1 t c_1 -I d_1 t d_1 )/2
in which Q sh For energy loss, I c_1 For a first charging current, t c_1 For the first charging time, I d_1 For a first discharge current, t d_1 Is the first discharge time.
In this embodiment, three first battery packs are provided, the energy loss of each first battery pack is determined, and the average value of the three energy losses is used as the energy loss used in step S106.
S105, determining a second charging current and a second charging time according to the second constant current charging test data, and determining a second discharging capacity and a second discharging time according to the second constant current discharging test data.
S106, determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the energy loss.
In the scheme, the formula adopted for determining the self-discharge current is as follows:
I z ＝(I c_2 t c_2 -I d_2 t d_2 -2Q sh )/(t d_2 +t c_2 )
wherein I is z For self-discharge current, I c_2 For a second charging current, t c_2 For the second charging time, I d_2 Is the second discharge current, t d_2 Is the second discharge time.
Example two
Referring to fig. 2, the embodiment of the self-discharge current determining device according to the present invention includes a self-discharge current determining unit, and the self-discharge current determining unit includes a charge-discharge module 100 and a calculation module 200;
the charge and discharge module 100 is configured to:
carrying out constant-current charging and constant-current discharging on the first battery pack by adopting current with a preset current value to obtain first constant-current charging test data and first constant-current discharging test data;
carrying out constant-current charging and constant-current discharging on the second battery pack by adopting a current with a preset current value to obtain second constant-current charging test data and second constant-current discharging test data;
the computing module 200 is configured to:
determining a first charge capacity according to the first constant current charge test data, and determining a first discharge capacity according to the first constant current discharge test data;
determining energy loss according to the first charging capacity and the first discharging capacity;
determining a second charging capacity and a charging time according to the second constant-current charging test data, and determining a second discharging capacity and a discharging time according to the second constant-current discharging test data;
and determining the self-discharge current of the second battery pack according to the second charge capacity, the charge time, the second discharge capacity, the discharge time and the energy loss.
In this embodiment, the self-discharge current determining unit may be specifically configured to implement any one of the self-discharge current determining methods in the first embodiment, and the specific implementation and the beneficial effects thereof are the same as those of the corresponding matters described in the first embodiment, and are not described herein.
Example III
Fig. 3 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 3, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the respective methods and processes described above, such as the self-discharge current determination method.
In some embodiments, the self-discharge current determination method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When a computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the self-discharge current determination method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the self-discharge current determination method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A self-discharge current determination method, comprising:
carrying out constant-current charging and constant-current discharging on the first battery pack by adopting current with a preset current value to obtain first constant-current charging test data and first constant-current discharging test data;
determining a first charging current and a first charging time according to the first constant current charging test data, and determining a first discharging current and a first discharging time according to the first constant current discharging test data;
determining energy loss according to the first charging current, the first charging time, the first discharging current and the first discharging time;
carrying out constant current charging and constant current discharging on a second battery pack by adopting the current with the preset current value to obtain second constant current charging test data and second constant current discharging test data;
determining a second charging current and a second charging time according to the second constant current charging test data, and determining a second discharging current and a second discharging time according to the second constant current discharging test data;
and determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the energy loss.
2. The self-discharge current determination method according to claim 1, wherein performing the constant-current charge and constant-current discharge with respect to the first battery pack and/or the second battery pack comprises:
standing for 10-30 min;
discharging by adopting current of at most 0.02C, and controlling to stop discharging when the first cut-off voltage is reached;
standing for 10-60 min;
charging with a current of at most 0.02C, and controlling to stop discharging when the second cut-off voltage is reached;
standing for 10-60 min;
discharging is performed by adopting current of at most 0.02C, and discharging is stopped under the condition that the first cut-off voltage is reached.
3. The self-discharge current determination method according to claim 1, wherein the value range of the preset current value is 0.01C to 0.02C.
4. The self-discharge current determination method of claim 1, wherein the energy loss is determined using the formula:
Q sh ＝(I c_1 t c_1 -I d_1 t d_1 )/2
in which Q sh For energy loss, I c_1 For a first charging current, t c_1 For the first charging time, I d_1 For a first discharge current, t d_1 Is the first discharge time.
5. The self-discharge current determination method as defined in claim 4, wherein the self-discharge current is determined using the formula:
I z ＝(I c_2 t c_2 -I d_2 t d_2 -2Q sh )/(t d_2 +t c_2 )
wherein I is z For self-discharge current, I c_2 For a second charging current, t c_2 For the second charging time, I d_2 Is the second discharge current, t d_2 Is the second discharge time.
6. The self-discharge current determination method according to any one of claims 1 to 5, wherein determining an energy loss from the first charge capacity, the first discharge capacity, includes:
determining the energy loss of a plurality of first battery packs, determining the average value of the energy loss, and recording the average value as the average energy loss;
and determining the self-discharge current of the second battery pack according to the second charge current, the second charge time, the second discharge current, the second discharge time and the average energy loss.
7. The self-discharge current determination method according to any one of claims 1 to 5, further comprising controlling an ambient temperature to a specified temperature when constant-current charging and constant-current discharging are performed.
8. The self-discharge current determining device is characterized by comprising a self-discharge current determining unit, wherein the self-discharge current determining unit comprises a charge-discharge module and a calculation module;
the charging and discharging module is used for:
carrying out constant-current charging and constant-current discharging on the first battery pack by adopting current with a preset current value to obtain first constant-current charging test data and first constant-current discharging test data;
carrying out constant current charging and constant current discharging on the second battery pack by adopting a current with a preset current value to obtain second constant current charging test data and second constant current discharging test data;
the computing module is used for:
determining a first charge capacity according to the first constant current charge test data, and determining a first discharge capacity according to the first constant current discharge test data;
determining energy loss according to the first charging capacity and the first discharging capacity;
determining a second charging capacity and a second charging time according to the second constant current charging test data, and determining a second discharging capacity and a second discharging time according to the second constant current discharging test data;
and determining the self-discharge current of the second battery pack according to the second charge capacity, the charge time, the second discharge capacity, the discharge time and the energy loss.
9. An electronic device comprising at least one processor, and a memory communicatively coupled to the at least one processor;
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the self-discharge current determination method of any one of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to implement the self-discharge current determination method of any one of claims 1-7 when executed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311873625.4A CN117783861A (en) | 2023-12-29 | 2023-12-29 | Self-discharge current determining method, device, equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311873625.4A CN117783861A (en) | 2023-12-29 | 2023-12-29 | Self-discharge current determining method, device, equipment and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117783861A true CN117783861A (en) | 2024-03-29 |
Family
ID=90398460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311873625.4A Pending CN117783861A (en) | 2023-12-29 | 2023-12-29 | Self-discharge current determining method, device, equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117783861A (en) |
-
2023
- 2023-12-29 CN CN202311873625.4A patent/CN117783861A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2851700B1 (en) | Method and terminal for displaying capacity of battery | |
| CN115932605A (en) | Method and device for correcting residual electric quantity of energy storage battery and battery management system | |
| WO2014004035A2 (en) | Charging a battery | |
| CN116008827A (en) | Determination method and device for lithium ion battery lithium precipitation potential and electronic equipment | |
| CN112881921A (en) | Battery equivalent circuit model parameter identification method, device, equipment and storage medium | |
| CN109991543B (en) | Method and device for acquiring residual electric quantity of battery pack and terminal equipment | |
| CN113361128A (en) | Abnormal battery cell screening method and system, computer equipment and storage medium | |
| CN115718265A (en) | Method for correcting battery DC resistance test value, electronic device and storage medium | |
| CN115902628A (en) | Method, device and equipment for calculating internal resistance of battery and storage medium | |
| CN108594117B (en) | Method and device for determining battery capacity, terminal equipment and computer storage medium | |
| CN112698229B (en) | Short-circuit current detection method and device, readable storage medium and electronic equipment | |
| WO2024093963A1 (en) | Battery life determination method and apparatus, electronic device, and storage medium | |
| CN117096478A (en) | Battery capacity-dividing method and device, electronic equipment and storage medium | |
| CN103208657B (en) | Storage battery set on-line balancing and activating device based on handshaking technology communication | |
| CN117783861A (en) | Self-discharge current determining method, device, equipment and storage medium | |
| CN114200315B (en) | Method and device for predicting remaining charging time, electronic equipment and storage medium | |
| CN113507154B (en) | Charging method and device, charger and electronic equipment | |
| CN115754772A (en) | Battery capacity attenuation processing method, device, equipment and storage medium | |
| CN114779109A (en) | Method and device for determining battery health state, electronic equipment and storage medium | |
| CN115007503B (en) | Cell sorting method, device, equipment and storage medium | |
| CN117706390B (en) | Rolling optimization estimation method and device for battery state of charge | |
| CN115291111B (en) | Training method of battery rest time prediction model and rest time prediction method | |
| CN117907847A (en) | Abnormal battery screening method, device, equipment and storage medium | |
| CN117054896A (en) | SOP function test method, device, equipment and storage medium | |
| CN114633833A (en) | Method, device, equipment and storage medium for determining running parameters of electric bicycle |
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 |