CN113782845A - Method and device for obtaining charging and discharging power of lithium battery - Google Patents

Method and device for obtaining charging and discharging power of lithium battery Download PDF

Info

Publication number
CN113782845A
CN113782845A CN202110872731.5A CN202110872731A CN113782845A CN 113782845 A CN113782845 A CN 113782845A CN 202110872731 A CN202110872731 A CN 202110872731A CN 113782845 A CN113782845 A CN 113782845A
Authority
CN
China
Prior art keywords
value
discharge
temperature value
lithium battery
temperature
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
Application number
CN202110872731.5A
Other languages
Chinese (zh)
Other versions
CN113782845B (en
Inventor
于洪泽
赵龙灿
宋泽宇
孙明金
廖磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Svolt Energy Technology Co Ltd
Original Assignee
Svolt Energy Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Svolt Energy Technology Co Ltd filed Critical Svolt Energy Technology Co Ltd
Priority to CN202110872731.5A priority Critical patent/CN113782845B/en
Publication of CN113782845A publication Critical patent/CN113782845A/en
Application granted granted Critical
Publication of CN113782845B publication Critical patent/CN113782845B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The embodiment of the application discloses a method and a device for acquiring charge and discharge power of a battery. The method comprises the following steps: acquiring a first discharge capacity value of a battery for executing discharge operation at a first temperature value and a second discharge capacity value for executing discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value; determining capacity change information of the battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value; and calculating the maximum charge-discharge power value corresponding to the battery at the first temperature value according to the capacity change information and the maximum charge-discharge power value corresponding to the battery at the second temperature value.

Description

Method and device for obtaining charging and discharging power of lithium battery
Technical Field
The embodiment of the application relates to the field of information processing, in particular to a method and a device for acquiring charging and discharging power of a lithium battery.
Background
With the development of lithium battery technology, the performance of the lithium battery is gradually increased, the electric vehicle is rapidly developed, and the sales volume of the lithium battery is gradually increased. Lithium ion lithium batteries are widely used in the fields of electric vehicles, communication equipment, storage equipment, and the like due to their characteristics of small size, high energy density, small self-discharge, no memory effect, long cycle life, and the like. Due to their limited capacity and capacity, single lithium ion lithium batteries are generally powered by a lithium battery pack in the event that the electric vehicle is used with a large amount of power. The lithium battery pack is built by a plurality of modules, and the modules are composed of smaller electric cores. The same type Of battery cell can be used for electric vehicles with different driving mileage and different power characteristics, and the SOC (State Of Charge) Of the battery cell can be different.
In practical application, the maximum charge and discharge power value of the lithium battery can be determined according to the size of the SOC of the battery cell. Because the maximum charging and discharging power value of the lithium battery is influenced by the temperature, how to quickly obtain a discharging power meter under the actual temperature of the lithium battery is an urgent problem to be solved.
Disclosure of Invention
In order to solve any one of the above technical problems, embodiments of the present application provide a method and an apparatus for obtaining charging and discharging power of a lithium battery.
In order to achieve the object of the embodiment of the present application, the present application provides a method for obtaining charge and discharge power of a lithium battery, including:
acquiring a first discharge capacity value of a lithium battery for executing discharge operation at a first temperature value and a second discharge capacity value for executing discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
determining capacity change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value;
and calculating the maximum charge-discharge power value corresponding to the first temperature value of the lithium battery according to the capacity change information and the maximum charge-discharge power value corresponding to the second temperature value of the lithium battery.
Optionally, the first discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a first temperature value;
and the second discharge capacity value is the discharge capacity value of the lithium battery for executing discharge operation at a second temperature value.
Optionally, the first discharge capacity value and the second discharge capacity value are capacity information corresponding to the discharge operation executed when the states of charge (SOC) of the lithium batteries are the same;
according to the first discharge capacity value and the second discharge capacity value, determining capacity change information of the lithium battery at a first temperature value relative to a second temperature value, wherein the capacity change information comprises:
and calculating a ratio between the first discharge capacity value and the second discharge capacity value, and taking the ratio as the capacity change information.
Optionally, the first discharge capacity value and the second discharge capacity value are obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of the SOC is obtained by the following steps:
and selecting the numerical value of the sampling point of the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different SOC corresponding to the second temperature value and the maximum charging and discharging power value.
Optionally, the calculating a maximum charge/discharge power value corresponding to the lithium battery at the first temperature value according to the capability change information and the maximum charge/discharge power value corresponding to the lithium battery at the second temperature value includes:
and calculating the product of the capacity change information and the maximum charge-discharge power value corresponding to the second temperature value to obtain the maximum charge-discharge power value corresponding to the first temperature value of the lithium battery.
Optionally, the calculating a product of the capability change information and a maximum charge-discharge power value corresponding to the second temperature value to obtain a maximum charge-discharge power value of the lithium battery at the first temperature value includes:
determining a numerical value of the SOC corresponding to the capacity change information;
determining a target maximum charge-discharge power value corresponding to the SOC value from the corresponding relation between different SOCs corresponding to a second temperature value and the maximum charge-discharge power value obtained in advance;
and calculating the product of the capacity change information and a target maximum charge-discharge power value to obtain a maximum charge-discharge power value corresponding to the SOC value of the lithium battery at a first temperature value.
Optionally, the method further includes:
and if the maximum charge-discharge power values corresponding to the at least two SOC values of the lithium battery at the first temperature value are obtained, generating a curve of the maximum charge-discharge power values corresponding to the first temperature value according to the maximum charge-discharge power values corresponding to the at least two SOC values.
The present application further provides a device for obtaining charge and discharge power of a lithium battery, including:
the lithium battery discharge control device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first discharge capacity value of a lithium battery for executing discharge operation at a first temperature value and a second discharge capacity value for executing discharge operation at a second temperature value, the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
the determining module is used for determining the capacity change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value;
and the calculation module is used for calculating the maximum charge and discharge power value corresponding to the first temperature value of the lithium battery according to the capacity change information and the maximum charge and discharge power value corresponding to the second temperature value of the lithium battery.
A storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method as described above when executed.
An electronic device comprising a memory having a computer program stored therein and a processor arranged to execute the computer program to perform the method as described above.
One of the above technical solutions has the following advantages or beneficial effects:
the method comprises the steps of determining capacity change information of the lithium battery at a first temperature value relative to a second temperature value by obtaining a first discharge capacity value of the lithium battery for executing a discharge operation at the first temperature value and a second discharge capacity value for executing the discharge operation at the second temperature value, and calculating a maximum charge and discharge power value corresponding to the lithium battery at the first temperature value according to the capacity change information and the maximum charge and discharge power value corresponding to the lithium battery at the second temperature value, so that the calculation accuracy of the maximum charge and discharge power value can be ensured, and the calculation operation efficiency is high.
Additional features and advantages of the embodiments of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the application. The objectives and other advantages of the embodiments of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the examples of the embodiments of the present application do not constitute a limitation of the embodiments of the present application.
Fig. 1 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a second embodiment of the present application;
fig. 3 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a third embodiment of the present application;
fig. 4 is a structural diagram of an apparatus for acquiring charge and discharge power of a lithium battery according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, in the embodiments of the present application, features in the embodiments and the examples may be arbitrarily combined with each other without conflict.
In the process of implementing the application, technical analysis is performed on the related technologies, and it is found that the related technologies have at least the following problems, including:
in the related technology, GB31467 requires the test method of the maximum charge-discharge power of the lithium battery to be charging at the normal temperature of 25 ℃, adjusting the SOC value, standing the lithium battery to different temperatures for power test, and completing the test of power values at different temperature points and different SOC points.
Because the charging and discharging of the lithium battery in the actual use process are carried out at the ambient temperature, and the charging operation and the discharging operation are carried out at different temperatures in the national standard test method, the accuracy of the obtained power meter is low.
Based on the above analysis, the embodiments of the present application provide the following solutions, including:
example one
Fig. 1 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to an embodiment of the present disclosure. As shown in fig. 1, the method includes:
step 101, obtaining a first discharge capacity value of a lithium battery for executing a discharge operation at a first temperature value and a second discharge capacity value for executing a discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
in one exemplary embodiment, the standard temperature value may be a temperature value used in testing the power information in the GB31467 requirement, e.g. 25 ℃.
The discharge capacity of the battery cell changes according to the temperature, wherein the discharge capacity is lower at low temperature than the charge point capacity at high temperature.
In an exemplary embodiment, the discharge capacity of the lithium battery may be obtained by detecting a discharge capacity, that is, the first discharge capacity value is a discharge capacity value at which the lithium battery performs a discharge operation at a first temperature value; the second discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a second temperature value. The discharge capacity of the battery core can change according to the temperature, wherein the discharge capacity is reduced at low temperature compared with the discharge capacity at the normal temperature of 25 ℃, so the discharge capacity is reduced; on the other hand, at high temperatures, the discharge capacity increases, with a consequent increase in discharge capacity.
The discharge capacity value may be a maximum value of the discharge capacity of the lithium battery.
The discharge capacity value is adopted to express the discharge capacity of the lithium battery, and the realization is simple and accurate.
102, determining capacity change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value;
because the change rule of the discharge capacity of the lithium battery under different temperature conditions is the same as the change rule of the maximum charge-discharge power, the capacity change information of the lithium battery under different temperature values can be used as the change information of the maximum charge-discharge power.
103, calculating a maximum charge and discharge power value corresponding to the lithium battery at a first temperature value according to the capacity change information and the maximum charge and discharge power value corresponding to the lithium battery at a second temperature value;
the maximum charge-discharge power value corresponding to the second temperature value is used as a reference value, the obtained capacity change information is used as the change information of the maximum charge-discharge power, the maximum charge-discharge power value corresponding to the first temperature value is calculated, the calculation accuracy of the maximum charge-discharge power value can be guaranteed, and the calculation operation efficiency is high.
The method that this application embodiment one provided, through obtaining the lithium cell and carrying out the first discharge capacity value of discharge operation at first temperature value to and, carry out the second discharge capacity value of discharge operation at the second temperature value, according to first discharge capacity value with the second discharge capacity value confirms the lithium cell is at the first temperature value for the ability change information of second temperature value, again according to ability change information and the lithium cell is at the maximum charge-discharge power value that the second temperature value corresponds, calculates the maximum charge-discharge power value that the lithium cell corresponds at first temperature value can guarantee the calculation accuracy of maximum charge-discharge power value, and calculation operating efficiency is high.
Example two
Fig. 2 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a second embodiment of the present application. As shown in fig. 2, the method includes:
step 201, when the SOC of the lithium battery is the same, obtaining a first discharge capacity value at which the lithium battery performs a discharge operation at a first temperature value, and obtaining a second discharge capacity value at which the lithium battery performs a discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
when the SOC of the lithium battery is the same, the first discharging capacity value and the second discharging capacity value are obtained, the obtaining conditions of the discharging capacity are the same except for different temperatures, and the accuracy of the obtained data is guaranteed.
In one exemplary embodiment, the standard temperature value may be a temperature value used to test power information as required by the national standard 31467, e.g., 25 ℃.
The discharge capacity of the battery cell changes according to the temperature, wherein the discharge capacity is lower at low temperature than the charge point capacity at high temperature.
In an exemplary embodiment, the discharge capacity of the lithium battery may be obtained by detecting a discharge capacity, that is, the first discharge capacity value is a discharge capacity value at which the lithium battery performs a discharge operation at a first temperature value; the second discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a second temperature value. The discharge capacity of the battery core can change according to the temperature, wherein the discharge capacity is reduced at low temperature compared with the discharge capacity at the normal temperature of 25 ℃, so the discharge capacity is reduced; on the other hand, at high temperatures, the discharge capacity increases, with a consequent increase in discharge capacity.
The discharge capacity value may be a maximum value of the discharge capacity of the lithium battery.
The discharge capacity value is adopted to express the discharge capacity of the lithium battery, and the realization is simple and accurate.
Optionally, the obtaining operation is obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of the SOC is obtained by the following steps:
and selecting the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different SOC corresponding to the second temperature value and the maximum charging and discharging power value.
The capacity change information is further determined by selecting the numerical value of the sampling point of the SOC as the collection condition of the discharge capacity value, so that the maximum charge-discharge power value corresponding to the sampling point of the SOC is conveniently used for calculation, and the accuracy of the maximum charge-discharge power value corresponding to the obtained first temperature value is ensured.
Step 202, determining capacity change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value;
because the change rule of the discharge capacity of the lithium battery under different temperature conditions is the same as the change rule of the maximum charge-discharge power, the capacity change information of the lithium battery under different temperature values can be used as the change information of the maximum charge-discharge power.
In one exemplary embodiment, the ratio may be used as the capability change information by calculating a ratio between the first discharge capability value and the second discharge capability value.
When the discharge capacity value is represented by the discharge capacity, it is possible to calculate a ratio of a discharge capacity value at which the discharge operation is performed at the first temperature value to a discharge capacity value at which the discharge operation is performed at the second temperature value.
In practical application, the obtained ratio can be corrected by using a preset first correction parameter, and the corrected ratio is used as capability change information to improve the accuracy of data.
Optionally, the obtaining operation is obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of the SOC is obtained by the following steps:
and selecting the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different SOC corresponding to the second temperature value and the maximum charging and discharging power value.
The capacity change information is further determined by selecting the numerical value of the sampling point of the SOC as the collection condition of the discharge capacity value, so that the maximum charge-discharge power value corresponding to the sampling point of the SOC is conveniently used for calculation, and the accuracy of the maximum charge-discharge power value corresponding to the obtained first temperature value is ensured. Step 203, calculating a maximum charge-discharge power value corresponding to the lithium battery at a first temperature value according to the capacity change information and the maximum charge-discharge power value corresponding to the lithium battery at a second temperature value;
the maximum charge-discharge power value corresponding to the second temperature value is used as a reference value, the obtained capacity change information is used as the change information of the maximum charge-discharge power, the maximum charge-discharge power value corresponding to the first temperature value is calculated, the calculation accuracy of the maximum charge-discharge power value can be guaranteed, and the calculation operation efficiency is high.
In an exemplary embodiment, the maximum charge and discharge power value of the lithium battery corresponding to the first temperature value may be obtained by calculating a product of the capacity change information and the maximum charge and discharge power value corresponding to the second temperature value.
In practical application, the obtained maximum charging and discharging power value can be corrected by using a preset second correction parameter, and the corrected maximum charging and discharging power value is used as the maximum charging and discharging power value corresponding to the first temperature value, so that the accuracy of data is improved.
In an exemplary embodiment, the maximum charge and discharge power value of the lithium battery corresponding to the first temperature value may be obtained by calculating a product of the capacity change information and the maximum charge and discharge power value corresponding to the second temperature value.
Optionally, determining a value of the SOC corresponding to the capability change information; determining a target maximum charge-discharge power value corresponding to the SOC value from the corresponding relation between different SOCs corresponding to a second temperature value and the maximum charge-discharge power value obtained in advance; and calculating the product of the capacity change information and a target maximum charge-discharge power value to obtain a maximum charge-discharge power value corresponding to the SOC value of the lithium battery at a first temperature value.
For example, when the temperature is the second temperature value T2, the sampling point of the SOC of the lithium battery is the SOC1，SOC2，…，SOCm(ii) a The corresponding maximum charge-discharge power value is PT2,1，PT2,2，…，PT2,m(ii) a Wherein m is an integer greater than or equal to 1.
If the capability change information is SOC at the sampling point of SOCiObtained by time, then using the sampling point SOCiCorresponding maximum charge-discharge power value PT2,iAnd calculating the maximum charge-discharge power value corresponding to the first temperature value, wherein i is greater than or equal to 1 and less than or equal to m.
By adopting the mode, the maximum charge and discharge power corresponding to different sampling points of the SOC can be determined, and the calculation accuracy is improved.
In practical application, the obtained maximum charging and discharging power value can be corrected by using a preset second correction parameter, and the corrected maximum charging and discharging power value is used as the maximum charging and discharging power value corresponding to the first temperature value, so that the accuracy of data is improved.
Optionally, if the maximum charge-discharge power values corresponding to the at least two SOC values of the lithium battery at the first temperature value are obtained, a curve of the maximum charge-discharge power value corresponding to the first temperature value is generated according to the maximum charge-discharge power values corresponding to the at least two SOC values.
By generating a curve of the maximum charge-discharge power value, the maximum charge-discharge power values corresponding to different SOC values are conveniently inquired.
The method that this application embodiment two provided, through obtaining the lithium cell and carrying out the first discharge capacity value of the operation of discharging at first temperature value to and, carry out the second discharge capacity value of the operation of discharging at the second temperature value, according to first discharge capacity value with the second discharge capacity value confirms the lithium cell is at the first temperature value for the ability change information of second temperature value, again according to ability change information and the lithium cell is at the maximum charge-discharge power value that the second temperature value corresponds, calculates the maximum charge-discharge power value that the lithium cell corresponds at first temperature value can guarantee the calculation accuracy of maximum charge-discharge power value, and calculation operating efficiency is high.
EXAMPLE III
Fig. 3 is a flowchart of a method for obtaining charge and discharge power of a lithium battery according to a third embodiment of the present application. As shown in fig. 3, the method includes:
step 301, obtaining a maximum charge-discharge Power meter Power map corresponding to each SOC point SOC _ axis and temperature point Temp _ axis when the Power battery is charged at a normal temperature of 25 ℃, wherein the maximum charge-discharge Power meter is a two-dimensional matrix of n × m, n is the total number of temperature sampling points, m is the total number of SOC sampling points, and n and m are integers greater than or equal to 2.
SOC_axis＝(SOC1，SOC2，…，SOCm) Wherein each element in the set SOC _ axis represents a different SOC sampling point; temp _ axis ═ t (t)1，t2，…，tn) Wherein each element in the set Temp _ axis represents a different temperature value;
Figure BDA0003189705080000091
each element in the matrix Temp _ axis represents the maximum charge-discharge power corresponding to a certain SOC sampling point under a certain temperature value;
the maximum charge/discharge power is measured by the power test method in GBT 31467.
Step 302. Obtaining the discharge capacity Q of the battery at the normal temperature of 25 DEG CambientAnd a discharge capacity Q (i) corresponding to the battery at a temperature T (i) lower than the normal temperature by 25 ℃;
wherein, t (i) ═ t1，t2，…，tk),T(i)<25, i ═ 1,2,3, …, k; wherein k is an integer greater than or equal to 2;
each element of the set t (i) represents a temperature value lower than 25 ℃.
Wherein the discharge capacity values of the battery at the same temperature are different under different SOC conditions.
Step 303, calculating the ratio R (i) of the discharge capacity of the battery at low temperature and the charge capacity at the normal temperature of 25 ℃;
Figure BDA0003189705080000101
the ratio of the charge capacities is calculated as the capability change information using the above calculation expression.
Step 304, calculating the maximum charge-discharge power of the battery at the temperature T (i) which is 25 ℃ lower than the normal temperature;
the maximum charge-discharge power value of the battery at the temperature of T (i) is calculated by using the charge capacity ratio R (i) and the maximum charge-discharge power value corresponding to the normal temperature of 25 ℃.
305, maintaining the charge-discharge power map at the temperature higher than 25 ℃, reconstructing an SOC coordinate system SOC _ rebuild at the temperature lower than the normal temperature and 25 ℃, and equally dividing each row into 100 parts, wherein the maximum SOC is 100%; and obtaining the maximum charge-discharge Power table Power _ rebuild under the reestablished SOC coordinate SOC _ rebuild by using the maximum charge-discharge Power of the battery at the temperature T (i) lower than the normal temperature by 25 ℃ and the original Power table by adopting a linear interpolation method.
Figure BDA0003189705080000102
Each element in the matrix SOC _ rebuild represents an SOC value corresponding to a certain sampling point at a certain temperature;
Figure BDA0003189705080000103
each element in the matrix Power _ rebuild represents the maximum charge-discharge Power value corresponding to a certain sampling point at a certain temperature;
from 0% to 100%, SOC coordinates were constructed at intervals of 101/100, SOC _ new ═ (0,1 × 101/100,2 × 101/100, …,100), t (i) ═ t (t ═ m1，t2，…，tk),tk<25, i-1, 2,3, …, k. And finally obtaining a charging and discharging maximum Power map table 'Power _ rebuild' corresponding to the SOC coordinate SOC _ new and the temperature coordinate T.
The method provided by the third embodiment of the application can calculate the charge-discharge power capability of the battery under the condition of low-temperature charging more quickly, saves the testing link and saves the economic cost.
Fig. 4 is a device for acquiring charge and discharge power of a lithium battery according to an embodiment of the present application, including:
the lithium battery discharge control device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first discharge capacity value of a lithium battery for executing discharge operation at a first temperature value and a second discharge capacity value for executing discharge operation at a second temperature value, the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
the determining module is used for determining the capacity change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value;
and the calculation module is used for calculating the maximum charge and discharge power value corresponding to the first temperature value of the lithium battery according to the capacity change information and the maximum charge and discharge power value corresponding to the second temperature value of the lithium battery.
In one exemplary embodiment, the first discharge capacity value is a discharge capacity value of the lithium battery performing a discharge operation at a first temperature value; and the second discharge capacity value is the discharge capacity value of the lithium battery for executing discharge operation at a second temperature value.
In an exemplary embodiment, the first discharge capacity value and the second discharge capacity value are capacity information corresponding to a discharge operation performed when the states of charge SOC of the lithium batteries are the same;
the determining module is configured to calculate a ratio between the first discharge capacity value and the second discharge capacity value, and use the ratio as the capacity change information.
In an exemplary embodiment, the first discharge power value and the second discharge power value are obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of the SOC is obtained by the following steps:
and selecting the numerical value of the sampling point of the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different SOC corresponding to the second temperature value and the maximum charging and discharging power value.
In an exemplary embodiment, the calculation module is configured to calculate a product of the capacity change information and a maximum charging and discharging power value corresponding to the second temperature value, so as to obtain a maximum charging and discharging power value corresponding to the first temperature value of the lithium battery.
In one exemplary embodiment, the calculation module includes:
a first determining unit, configured to determine a value of an SOC corresponding to the capability change information;
a second determining unit, configured to determine a target maximum charge/discharge power value corresponding to a value of an SOC from a correspondence between different SOCs corresponding to a second temperature value acquired in advance and a maximum charge/discharge power value;
and the calculating unit is used for calculating the product of the capacity change information and a target maximum charge-discharge power value to obtain a maximum charge-discharge power value corresponding to the SOC value of the lithium battery at a first temperature value.
In one exemplary embodiment, the apparatus further comprises:
the generating module is used for generating a curve of the maximum charging and discharging power value corresponding to the first temperature value according to the maximum charging and discharging power values corresponding to the at least two SOC values if the maximum charging and discharging power values corresponding to the at least two SOC values of the lithium battery at the first temperature value are obtained.
The device that this application embodiment provided, through obtaining the lithium cell and carrying out the first discharge capacity value of the operation of discharging at first temperature value to and, carry out the second discharge capacity value of the operation of discharging at the second temperature value, according to first discharge capacity value with second discharge capacity value confirms the lithium cell is at first temperature value for the ability change information of second temperature value, again according to ability change information and the lithium cell is at the maximum charge-discharge power value that the second temperature value corresponds, calculates the lithium cell can guarantee the calculation accuracy of maximum charge-discharge power value at the maximum charge-discharge power value that first temperature value corresponds, and calculation operating efficiency is high.
An embodiment of the present application provides a storage medium, in which a computer program is stored, wherein the computer program is configured to perform the method described in any one of the above when the computer program runs.
An embodiment of the application provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the method described in any one of the above.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

Claims (10)

1. A method for obtaining charging and discharging power of a lithium battery comprises the following steps:
acquiring a first discharge capacity value of a lithium battery for executing discharge operation at a first temperature value and a second discharge capacity value for executing discharge operation at a second temperature value, wherein the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
determining capacity change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value;
and calculating the maximum charge-discharge power value corresponding to the first temperature value of the lithium battery according to the capacity change information and the maximum charge-discharge power value corresponding to the second temperature value of the lithium battery.
2. The method of claim 1,
the first discharge capacity value is a discharge capacity value of the lithium battery for executing discharge operation at a first temperature value;
and the second discharge capacity value is the discharge capacity value of the lithium battery for executing discharge operation at a second temperature value.
3. The method according to claim 1 or 2, characterized in that:
the first discharge capacity value and the second discharge capacity value are capacity information corresponding to the discharge operation executed when the SOC of the lithium battery is the same;
according to the first discharge capacity value and the second discharge capacity value, determining capacity change information of the lithium battery at a first temperature value relative to a second temperature value, wherein the capacity change information comprises:
and calculating a ratio between the first discharge capacity value and the second discharge capacity value, and taking the ratio as the capacity change information.
4. The method of claim 3, wherein the first discharge power value and the second discharge power value are obtained when the SOC of the lithium battery is a preset value;
wherein the preset value of the SOC is obtained by the following steps:
and selecting the numerical value of the sampling point of the SOC in the corresponding relation as a preset numerical value from the corresponding relation between different SOC corresponding to the second temperature value and the maximum charging and discharging power value.
5. The method of claim 1, wherein calculating the maximum charging/discharging power value corresponding to the lithium battery at the first temperature value according to the capability change information and the maximum charging/discharging power value corresponding to the lithium battery at the second temperature value comprises:
and calculating the product of the capacity change information and the maximum charge-discharge power value corresponding to the second temperature value to obtain the maximum charge-discharge power value corresponding to the first temperature value of the lithium battery.
6. The method according to claim 5, wherein the calculating a product of the capability change information and a maximum charging/discharging power value corresponding to the second temperature value to obtain a maximum charging/discharging power value of the lithium battery at the first temperature value comprises:
determining a numerical value of the SOC corresponding to the capacity change information;
determining a target maximum charge-discharge power value corresponding to the SOC value from the corresponding relation between different SOCs corresponding to a second temperature value and the maximum charge-discharge power value obtained in advance;
and calculating the product of the capacity change information and a target maximum charge-discharge power value to obtain a maximum charge-discharge power value corresponding to the SOC value of the lithium battery at a first temperature value.
7. The method of claim 6, further comprising:
and if the maximum charge-discharge power values corresponding to the at least two SOC values of the lithium battery at the first temperature value are obtained, generating a curve of the maximum charge-discharge power values corresponding to the first temperature value according to the maximum charge-discharge power values corresponding to the at least two SOC values.
8. An apparatus for acquiring charge and discharge power of a lithium battery, comprising:
the lithium battery discharge control device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first discharge capacity value of a lithium battery for executing discharge operation at a first temperature value and a second discharge capacity value for executing discharge operation at a second temperature value, the first temperature value is smaller than the second temperature value, and the second temperature value is a preset standard temperature value;
the determining module is used for determining the capacity change information of the lithium battery at a first temperature value relative to a second temperature value according to the first discharge capacity value and the second discharge capacity value;
and the calculation module is used for calculating the maximum charge and discharge power value corresponding to the first temperature value of the lithium battery according to the capacity change information and the maximum charge and discharge power value corresponding to the second temperature value of the lithium battery.
9. A storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 7 when executed.
10. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 7.
CN202110872731.5A 2021-07-30 2021-07-30 Method and device for obtaining charge and discharge power of lithium battery Active CN113782845B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110872731.5A CN113782845B (en) 2021-07-30 2021-07-30 Method and device for obtaining charge and discharge power of lithium battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110872731.5A CN113782845B (en) 2021-07-30 2021-07-30 Method and device for obtaining charge and discharge power of lithium battery

Publications (2)

Publication Number Publication Date
CN113782845A true CN113782845A (en) 2021-12-10
CN113782845B CN113782845B (en) 2023-06-02

Family

ID=78836279

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110872731.5A Active CN113782845B (en) 2021-07-30 2021-07-30 Method and device for obtaining charge and discharge power of lithium battery

Country Status (1)

Country Link
CN (1) CN113782845B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009219213A (en) * 2008-03-07 2009-09-24 Toyota Motor Corp Power supply device for electric vehicle
CN106314170A (en) * 2016-08-18 2017-01-11 重庆长安汽车股份有限公司 Power calculation method and system for power battery system and electric vehicle
US20180123185A1 (en) * 2016-10-31 2018-05-03 Korea University Of Technology And Education Industry-University Cooperation Foundation Method for predicting battery health in consideration of temperature of battery management system
US20180316815A1 (en) * 2017-04-28 2018-11-01 Square, Inc. Point of sale device power management and undervoltage protection
CN109342955A (en) * 2018-11-19 2019-02-15 台州钱江新能源研究院有限公司 A kind of projectional technique and system of capacity of lithium ion battery
CN112098853A (en) * 2020-08-21 2020-12-18 北京车和家信息技术有限公司 Capacity attenuation battery discharge power determination method and device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009219213A (en) * 2008-03-07 2009-09-24 Toyota Motor Corp Power supply device for electric vehicle
CN106314170A (en) * 2016-08-18 2017-01-11 重庆长安汽车股份有限公司 Power calculation method and system for power battery system and electric vehicle
US20180123185A1 (en) * 2016-10-31 2018-05-03 Korea University Of Technology And Education Industry-University Cooperation Foundation Method for predicting battery health in consideration of temperature of battery management system
US20180316815A1 (en) * 2017-04-28 2018-11-01 Square, Inc. Point of sale device power management and undervoltage protection
CN109342955A (en) * 2018-11-19 2019-02-15 台州钱江新能源研究院有限公司 A kind of projectional technique and system of capacity of lithium ion battery
CN112098853A (en) * 2020-08-21 2020-12-18 北京车和家信息技术有限公司 Capacity attenuation battery discharge power determination method and device

Also Published As

Publication number Publication date
CN113782845B (en) 2023-06-02

Similar Documents

Publication Publication Date Title
CN110967636B (en) Battery state of charge correction method, device and system and storage medium
CN107533110B (en) Apparatus and method for evaluating degree of aging of secondary battery
CN104931882B (en) The method and apparatus of power battery cubage correction
CN109856542B (en) Calibration method of lithium battery SOC-OCV curve cluster, SOC correction method and device
JP2011053215A (en) Improved method for estimating non-measurable characteristic of electrochemical system
CN110456273A (en) A kind of battery SOC evaluation method, estimating system, electrokinetic cell system
CN112689934B (en) Charging method, electronic device, and storage medium
CN113093027B (en) Battery SOC calibration method, device, system, medium and program product
US20210119461A1 (en) Electronic device and method for charging battery
CN113484783B (en) Battery SOH detection method, device, system, medium and program product
CN112213659A (en) Battery capacity correction method and test system
CN114325407A (en) Battery self-discharge test method, device, equipment and computer storage medium
CN115113049A (en) Method for determining initial value of battery SOC and related device
CN112108400B (en) Test method for predicting cycle performance of soft package battery
CN113176516A (en) Capacity prediction method, capacity prediction device, electronic device, and storage medium
CN112230152B (en) Method and system for measuring internal resistance increment of single battery cell
CN112731160A (en) Battery hysteresis model training method, and method and device for estimating battery SOC
CN117151201A (en) Battery pack sample organization method and device for neural network training
CN113782845B (en) Method and device for obtaining charge and discharge power of lithium battery
CN114966453A (en) Method and related device for acquiring remaining available energy of lithium battery
CN115128465A (en) Battery thermal simulation system and method and electronic equipment
US11480615B2 (en) Apparatus and method for estimating SOC of battery
CN112782601A (en) Method, system and equipment for acquiring health degree of battery and readable storage medium
CN116259866B (en) Charging method, battery management system, battery, and readable storage medium
CN113805072B (en) Capacity determining method and device, capacity dividing method and power battery system

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