CN114325407B - Battery self-discharge test method, device, equipment and computer storage medium - Google Patents
Battery self-discharge test method, device, equipment and computer storage medium Download PDFInfo
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Abstract
The application provides a battery self-discharge test method, a device, electronic equipment and a computer readable storage medium, wherein the self-discharge test method comprises the following steps: acquiring discharge data of q batteries; fitting the discharge data to obtain a linear fitting equation K=m× (1/R) +n; and calculating the self-discharge current of the battery based on the intercept and the slope of the linear fitting equation and the open-circuit voltage of the battery. The application can more intuitively represent the self-discharge current of the battery by directly testing the self-discharge current of the battery, and compared with the prior art, the application not only can improve the testing efficiency, but also can avoid the interference of external factors and reduce the occurrence of missed judgment and false judgment.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method, an apparatus, a device, and a computer storage medium for testing battery self-discharge.
Background
With the rapid development of new energy automobiles, the rechargeable battery industry as an energy storage power source of electric vehicles is also rapidly developed. The power battery pack is used as an energy source of the electric automobile, and the performance of the power battery pack is a key factor affecting the normal operation of the electric automobile. The power battery pack is an energy storage system or a battery pack formed by combining a plurality of single batteries in series and parallel connection, and therefore, the consistency of the performance of the power battery pack has an important influence on the performance and the service life of the power battery pack.
In the use process of the power battery pack, consistency of various performances of each single battery in combination needs to be ensured, wherein self-discharge of the battery is a key performance. The self-discharge of the battery is a phenomenon that the voltage of the battery is reduced and the capacity of the battery is reduced in an open state, and is one of main parameters for measuring the performance of the battery, and is unavoidable in practical applications of the battery due to the problem of the manufacturing process. The self-discharge of a single battery often causes the voltage of the single battery to be quickly reduced, and further causes the charge holding capacity of the whole power battery pack to be weakened, so that the detection of the self-discharge of the battery and the screening of defective products with large self-discharge of the battery are particularly important.
The self-discharge process occurs inside the battery, is related to the battery materials and processes, and varies with the ambient temperature, the battery life, and the state of charge, and the existing measurement method cannot go deep into the battery to directly measure it, which makes the detection of self-discharge difficult. According to a long-time open circuit shelving method established by industry standards, a battery is left open circuit for 7 days or 28 days at a high temperature or normal temperature, and the self-discharge performance of the battery is judged by measuring the discharge electric quantity of the battery when the battery is discharged to a cut-off voltage.
Disclosure of Invention
The application aims to solve the problems of low efficiency and low accuracy in detecting the self-discharge of the battery in the prior art.
To solve the above problems, a first aspect of the present application provides a method for testing self-discharge of a battery, including:
acquiring discharge data of q batteries; wherein the discharge data of the battery is Y 1 、Y 2 、…、Y i 、…、Y P ，Y i ＝(1/R i ，K i )，R i Representing the resistance value of the ith external resistor of the battery, wherein the resistance values of all the external resistors are different; k (K) i Represents the voltage decay rate, K, at the ith external resistor i The voltage value of the ith external resistor measured at each collecting time is calculated and obtained by a plurality of different collecting times;
fitting the discharge data to obtain a linear fitting equation K=m× (1/R) +n; wherein K is the voltage decay rate, R is the resistance value of the external resistor, m is the slope, and n is the intercept;
and calculating the self-discharge current of the battery based on the intercept and the slope of the linear fitting equation and the open-circuit voltage of the battery.
Further, the discharge data of the q cells are measured under the same environmental parameters including: one or more of temperature, humidity and air pressure.
Further, 1/R 1 、1/R 2 、…、1/R i 、…、1/R p Is an arithmetic progression distribution.
Further, the resistance values of the p external resistors are all in the range of 10KΩ to 10MΩ.
Further, the time intervals of any two adjacent acquisition times in the plurality of different acquisition times are equal, and the time interval is between 20 hours and 50 hours.
Further, the method further comprises the following steps:
comparing the self-discharge currents of the q batteries with a current threshold;
if the self-discharge current of the battery is larger than the current threshold value, the battery is a defective product; and if the self-discharge current of the battery is not greater than the current threshold, the battery is good.
Further, the current threshold is calculated according to the average value and standard deviation of the self-discharge currents of the q batteries.
A second aspect of the present application provides a battery self-discharge test device, comprising:
a discharge data acquisition unit configured to acquire discharge data of q batteries; wherein the discharge data of the battery is Y 1 、Y 2 、…、Y i 、…、Y P ，Y i ＝(1/R i ，K i )，R i Representing the resistance value of the ith external resistor of the battery, wherein the resistance values of all the external resistors are different; k (K) i Represents the voltage decay rate, K, at the ith external resistor i The voltage value of the ith external resistor measured at each collecting time is calculated and obtained by a plurality of different collecting times;
a linear fitting unit for fitting the discharge data to obtain a linear fitting equation k=m× (1/R) +n; wherein K is the voltage decay rate, R is the resistance value of the external resistor, m is the slope, and n is the intercept;
and a self-discharge current acquisition unit for calculating the self-discharge current of the battery based on the intercept and the slope of the linear fitting equation and the open-circuit voltage of the battery.
A third aspect of the present application provides an electronic device comprising a memory and a processor, the processor and the memory completing communication with each other via a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of the first aspects.
A fourth aspect of the application provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method according to any of the first aspects.
According to the battery self-discharge test method, the battery is connected with the external resistor, the resistance value of the external resistor is changed, the current is changed along with the change of the resistance value of the external resistor, the current comprises the current caused by the external resistor and the current of the battery self-discharge, the relation between the resistance value of the external resistor and the voltage attenuation rate is established by changing the resistance value of the external resistor, the parameter affecting the voltage attenuation rate is obtained, the current and the voltage attenuation rate are in direct proportion, and therefore the parameter affecting the self-discharge current of the battery is obtained, and the self-discharge current of the battery is obtained according to the open circuit voltage of the battery; according to the battery self-discharge testing method provided by the embodiment of the application, the self-discharge current of the battery is directly tested, so that the self-discharge current of the battery can be more intuitively represented, and compared with the prior art, the testing efficiency can be improved, the interference of external factors (such as dq/dv values of a battery material system) can be avoided, and the occurrence of missed judgment and false judgment is reduced.
Drawings
Fig. 1 is a schematic flow chart of a battery self-discharge test method according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of an external resistor of a battery according to an embodiment of the present application;
FIG. 3 is a graph showing the self-discharge current distribution of a battery according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a battery self-discharge testing device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Since the self-discharge process occurs inside the battery, is related to the battery materials and processes, and varies with the ambient temperature, the battery life, and the state of charge, the existing measurement method cannot go deep into the battery to directly measure it, which makes the detection of self-discharge difficult. According to a long-time open circuit shelving method established by industry standards, a battery is left open circuit for 7 days or 28 days at a high temperature or normal temperature, and the self-discharge performance of the battery is judged by measuring the discharge electric quantity of the battery when the battery is discharged to a cut-off voltage.
In addition, at present, although the voltage decay rate is tested to select defective products, namely, the open-circuit voltage V1 of the battery is tested firstly, the open-circuit voltage V2 is tested again after the interval time t, the voltage decay rate K= (V1-V2)/t is calculated, the K value is used for representing the self-discharge, but the K value is easily influenced by various other factors, such as dq/dv value of a battery material system, and the like, so that the K value is not visual enough for representing the self-discharge, and misjudgment and omission are easy to occur.
The application provides a battery self-discharge test method, a device, equipment and a computer storage medium, aiming at solving the technical problems in the prior art.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
It should be noted that examples of embodiments of the present application are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a flow chart of a battery self-discharge testing method according to an embodiment of the application. Referring to fig. 1, a first aspect of the present application provides a method for testing self-discharge of a battery, comprising the steps of:
s1, acquiring discharge data of q batteries, wherein q is an integer greater than 1; wherein the discharge data of the battery is Y 1 、Y 2 、…、Y i 、…、Y P I=1, 2, …, p is an integer greater than 1, Y i ＝(1/R i ，K i )，R i The resistance of the ith external resistor of the battery is represented, and the resistances of the external resistors are different; k (K) i Represents the voltage decay rate, K, at the ith external resistor i The voltage value of the ith external resistor measured at each collecting time is calculated by a plurality of different collecting times.
Fig. 2 is a schematic circuit diagram of an external resistor of a battery according to an embodiment of the application. As shown in fig. 2, a resistor is externally connected between the positive electrode and the negative electrode of the battery to form a circuit, and the discharge data of the battery is tested while maintaining the connected state of the circuit.
In order to ensure the accuracy of the discharge data of the q batteries, and avoid the external factors from interfering with the accuracy of the self-discharge current of each battery, the discharge data of the q batteries are measured under the same environmental parameters, including but not limited to: one or more of temperature, humidity and air pressure.
P external resistors are respectively connected between the positive electrode and the negative electrode of each battery, the connection state of the circuit is maintained, the resistance values of the external resistors are different, and discharge data of the battery under the external resistors with different resistance values are sequentially tested to obtain Y 1 、Y 2 、…、Y i 、…、Y P And (3) a series of discharge data, wherein q batteries are respectively connected with p external resistors according to the method, and each battery obtains a series of discharge data. Wherein Y is i ＝(1/R i ，K i )，K i The voltage attenuation rate under the ith external resistor is shown, and as the voltage value of the battery is different along with the change of the resistance value of the external resistor when the battery is connected with the external resistors with different resistance values, the voltage attenuation rate value is also different due to the change of the voltage value of the battery, so that the voltage attenuation rate corresponding to the different external resistors and the voltage attenuation rate K are collected i The voltage value of the ith external resistor measured at each collecting time is calculated by a plurality of different collecting times.
Specifically, an ith external resistor is connected between the positive electrode and the negative electrode of the battery, and the resistance value of the ith resistor is R i Maintaining the connection state of the circuit, testing the first voltage value of the battery at the first acquisition time, and maintaining the batteryAnd after the state of the external resistor is kept still, testing the second voltage value of the battery at the second acquisition time again.
The specific value of t is not further limited in the embodiment of the present application, and a person skilled in the art may determine the specific value of t according to the actual situation, but in order to improve the test efficiency, t is 2 on the basis of the above embodiment, and, of course, in order to improve the test accuracy, t may also be a numerical value of 3, 4, 5, or the like.
When the ith external resistor is connected with the battery, after different acquisition time and voltage values under each acquisition time are obtained, the acquisition time is taken as an abscissa, the voltage value under each acquisition time is taken as an ordinate, and a linear equation of the acquisition time and the voltage value is obtained by fitting, wherein the slope of the linear equation is K i . For example: when t is 2, the battery is connected with an ith external resistor between the positive electrode and the negative electrode, and the resistance value of the ith resistor is R i Maintaining the communication state of the circuit, testing a first voltage value U1 of the battery at a first acquisition time t1, maintaining the state of an external resistor of the battery, standing, and then testing a second voltage value U2 of the battery at a second acquisition time t2 again to obtain a voltage value K i ＝(U1-U2)/(t2-t1)。
It should be noted that, when the battery is connected to external resistors with different resistance values, the variation difference of the voltage values at different collection times is small, and only mV level variation is possible, so that in order to ensure the accuracy of the final measurement result, the specific values of the voltage values at different collection times at least keep 2 to 3 valid figures unchanged.
In the embodiment of the application, when the battery is connected with external resistors with different resistance values, the values of a plurality of acquisition times can be the same or different, but in order to improve the accuracy of a test result and reduce the interference of external factors, when the battery is connected with external resistors with different resistance values, the time intervals of any two adjacent acquisition times in a plurality of different acquisition times are equal, in order to avoid the effectiveness of self-discharge screening of the battery, the time intervals of the acquisition times are prevented from being too long, the test efficiency is influenced, and the time interval is between 20 hours and 50 hours; preferably, the time interval is 24 hours.
In order to further improve the accuracy of the test result, avoid interference caused by different acquisition time nodes, connect the battery of different external resistors at the same acquisition time, test the voltage value of the battery under the corresponding acquisition time, for example, when the battery is connected with the 1 st external resistor, test the voltage value of the battery under the initial time (namely, when the battery is just communicated with the external resistor), keep the state of the external resistor of the battery and stand, and then test the voltage value of the battery after 24 hours (namely, calculate and stand for 24 hours with the initial time) again; when the battery is connected with the 2 nd external resistor, testing the voltage value of the battery in the initial time, keeping the state of the battery external resistor, standing, and then testing the voltage value of the battery after 24 hours again; .. according to the method, when the battery is connected with the ith external resistor, testing the voltage value of the battery in the initial time, keeping the state of the battery external resistor, standing, and testing the voltage value of the battery again after 24 hours; that is, when the battery is connected with different external resistors, the voltage value of the battery at the corresponding acquisition time is tested under the same acquisition time and the same time interval under each external resistor.
In order to ensure that the self-discharge current of each battery can be obtained through more accurate testing, the range of the resistance values of the p external resistors is 10KΩ to 10MΩ on the basis of the embodiment.
The resistance values of the p external resistors are different, in order to avoid that the difference of the resistance values of the external resistors is not large or the difference of the resistance values of the external resistors is too large, the distribution of discharge data is dense or sparse, and finally the accuracy of the self-discharge current of the battery is influenced, 1/R is realized on the basis of the embodiment 1 、1/R 2 、…、1/R i 、…、1/R p Is an arithmetic progression distribution, wherein 1/R 1 、1/R 2 、…、1/R i 、…、1/R p Can be sequentially increased arithmetic progression, 1/R 1 、1/R 2 、…、1/R i 、…、1/R p It may also be a sequentially decreasing series of arithmetic, for example: 1/R 1 、1/R 2 、…、1/R i 、…、1/R p Sequentially 1/100, 1/50, 3/100 …, i/100, … and p/100.
1/R 1 、1/R 2 、…、1/R i 、…、1/R p The maximum value of (a) is determined according to the capacity of the battery and the characteristics of the battery, and the embodiment of the present application is not further limited thereto, and may be set according to actual circumstances by those skilled in the art.
Step S2, fitting the discharge data to obtain a linear fitting equation K=mX (1/R) +n; wherein K is the voltage decay rate, R is the resistance of the external resistor, m is the slope, and n is the intercept.
When the batteries are connected with different external resistors, the voltage values of the batteries to be tested are different due to different resistance values of the external resistors, so that voltage decay rates K are different, all discharge data obtained by connecting the batteries with different external resistors are subjected to curve fitting, 1/R is taken as an independent variable in the curve fitting, K is taken as a dependent variable, a linear fitting equation K=mX (1/R) +n of each battery is obtained, and the specific values of the slope m and the intercept n of the linear fitting equation can be obtained after curve fitting due to the fact that 1/R and K are known values.
And step S3, calculating the self-discharge current of the battery based on the intercept and the slope of the linear fitting equation and the open-circuit voltage of the battery.
Along with the change of the resistance value of the external resistor, the current also changes along with the change of the resistance value of the external resistor, and the current comprises the current caused by the external resistor and the self-discharge current of the battery.
The self-discharge current I1 of the battery is calculated by the following formula:
I1＝n×U/m
wherein U is the open circuit voltage of the battery.
The open circuit voltage of a battery is known, i.e., the open circuit voltage of a battery is equal to the difference between the positive electrode potential and the negative electrode potential of the battery when the battery is open (i.e., no current passes through both poles); and m and n are parameters in a linear fitting equation, specific values of m and n can be obtained after the discharge data of the battery are fitted, and the self-discharge current I1 of the battery can be obtained according to the open circuit voltage U of the battery and specific values of the slope m and the intercept n of the linear fitting equation.
It should be noted that, for a batch of batteries with the same capacity and the same characteristics, in order to improve efficiency, the open circuit voltage U of the battery may be an average value of the open circuit voltages of the batch of batteries. The variation of the open circuit voltage of the same batch of cells is small, and may vary only in mV level, so that the specific value of the open circuit voltage of the same batch of cells remains unchanged by at least 2 to 3 significant digits in order to ensure the accuracy of the final measurement result.
The battery self-discharge testing method provided by the embodiment of the application further comprises the following steps:
comparing the self-discharge current of the q cells with a current threshold;
if the self-discharge current of the battery is larger than the current threshold value, the battery is a defective product; and if the self-discharge current of the battery is not greater than the current threshold value, the battery is good.
And q batteries acquire discharge data of each battery according to the method, a linear fitting equation of each battery is obtained according to the discharge data, the slope and intercept of each linear fitting equation are obtained, and the self-discharge current of each battery is calculated according to the open-circuit voltage of each battery.
Comparing the self-discharge currents of the q batteries with a current threshold one by one, wherein the current threshold is calculated according to the average value and standard deviation of the self-discharge currents of the q batteries, and the current threshold can be calculated according to the following formula:
current threshold = average value of self-discharge currents of q cells +3 x standard deviation.
Specifically, the interval in which the self-discharge currents of the q batteries are located and the occurrence frequency of the interval can be counted, a distribution diagram is made according to the interval in which the self-discharge currents of the q batteries are located and the frequency, and the average value and the standard deviation of the self-discharge currents of the q batteries are calculated.
If the self-discharge current of the battery is less than or equal to the current threshold value, the battery is good; if the self-discharge current of the battery is greater than the current threshold, the battery is defective.
According to the battery self-discharge testing method provided by the embodiment of the application, the battery is connected with the external resistor, the resistance value of the external resistor is changed, the current is changed along with the change of the resistance value of the external resistor, the current comprises the current caused by the external resistor and the current of the battery self-discharge, the relation between the resistance value of the external resistor and the voltage attenuation rate is established by changing the resistance value of the external resistor, the parameter affecting the voltage attenuation rate is obtained, and the current and the voltage attenuation rate are in direct proportion, so that the parameter affecting the self-discharge current of the battery is obtained, and the self-discharge current of the battery is obtained according to the open circuit voltage of the battery; according to the battery self-discharge testing method provided by the embodiment of the application, the self-discharge current of the battery is directly tested, so that the self-discharge current of the battery can be more intuitively represented, and compared with the prior art, the testing efficiency can be improved, the interference of external factors (such as dq/dv values of a battery material system) can be avoided, and the occurrence of missed judgment and false judgment is reduced.
The method for testing the self-discharge of the battery according to the embodiment of the present application will be described in more detail with reference to an example.
Step 1, a lithium ion battery is taken, an external resistor R1 (R1=100K omega) is connected between the positive electrode and the negative electrode of the battery, the voltage value of the lithium ion battery at an initial time t1 is tested to obtain a voltage value U1 of 3.85464V, the state of the external resistor of the battery is kept and kept stand for 24 hours, the voltage value of the battery at t2 is tested again to obtain a voltage value U2 of 3.85413V, the voltage decay rate K1 of the battery under the external resistor R1 is obtained, namely K1= (U1-U2)/(t 2-t 1), the specific values of U1, U2, t1 and t2 are brought in, and K1 is calculated to be 0.0212mV/h;
step 2, removing an external resistor R1, connecting an external resistor R2 (R < 2 > =50kΩ) between the positive electrode and the negative electrode of the battery according to the same method as the step 1, repeating the method in the step 1, calculating to obtain the voltage attenuation rate K2 of the battery under the external resistor R2, and calculating to obtain K2 as 0.0342mV/h;
step 3, fitting (1/R1, K1) and (1/R2, K2) to obtain a linear fitting equation K=mX (1/R) +n, and substituting (1/R1, K1) and (1/R2, K2) into the linear fitting equation in sequence to obtain a slope m= (K2-K1)/(1/R2-1/R1) =1.3 mV kΩ/h, and an intercept n=K1-m/R1=0.0082 mV/h;
step 4, substituting the intercept n and the slope m of the linear fitting equation and the open circuit voltage U of the battery into a formula I1=n×U/m, and calculating to obtain the self-discharge current I1 of the battery as 24uA;
step 5, testing the self-discharge current of a batch of batteries (about 1 ten thousand batteries) according to the method in the step 1 to the step 4, and making a distribution diagram of the interval and the occurrence frequency of the self-discharge current of the batch of batteries, wherein the distribution diagram is shown in fig. 3, the average value and the standard deviation of the batch of batteries are calculated, and a current threshold value is calculated according to the average value +3×the standard deviation of the self-discharge current of the batch of batteries, if the self-discharge current of the batteries is less than or equal to the current threshold value, the batteries are good products (namely, the left part of a broken line in fig. 3 is good products); if the self-discharge current of the battery is greater than the current threshold, the battery is defective (i.e., the right part of the broken line in fig. 3 is defective), and the defective is removed from the batch of batteries.
Fig. 4 is a schematic structural diagram of a battery self-discharge testing device according to an embodiment of the present application. Referring to fig. 4, a second aspect of the present application provides a battery self-discharge testing apparatus, comprising: a discharge data acquisition unit 101, a linear fitting unit 102, and a self-discharge current acquisition unit 103, wherein:
a discharge data acquisition unit 101 for acquiring discharge data of q batteries; wherein the discharge data of the battery is Y 1 、Y 2 、…、Y i 、…、Y P ，Y i ＝(1/R i ，K i )，R i The resistance of the ith external resistor of the battery is represented, and the resistances of the external resistors are different; k (K) i Represents the voltage decay rate, K, at the ith external resistor i The voltage value of the ith external resistor measured at each collecting time is calculated and obtained by a plurality of different collecting times;
a linear fitting unit 102 for fitting the discharge data to obtain a linear fitting equation k=m× (1/R) +n; wherein K is the voltage decay rate, R is the resistance value of the external resistor, m is the slope, and n is the intercept;
the self-discharge current obtaining unit 103 calculates the self-discharge current of the battery based on the intercept and the slope of the linear fitting equation, and the open circuit voltage of the battery.
The embodiment of the application relates to a battery self-discharge testing device, and more particularly, the embodiment flow of the method is specifically shown in the content of the embodiment of the battery self-discharge testing method, and is not repeated herein. According to the battery self-discharge testing device, the battery is connected with the external resistor, the resistance value of the external resistor is changed, the current is changed along with the change of the resistance value of the external resistor, the current comprises the current caused by the external resistor and the current of the battery self-discharge, the relation between the resistance value of the external resistor and the voltage attenuation rate is established by changing the resistance value of the external resistor, the parameter affecting the voltage attenuation rate is obtained, the current and the voltage attenuation rate are in direct proportion, and therefore the parameter affecting the self-discharge current of the battery is obtained, and the self-discharge current of the battery is obtained according to the open circuit voltage of the battery; in addition, the self-discharge current of the battery can be more intuitively represented by directly testing the self-discharge current of the battery, and compared with the prior art, the self-discharge current of the battery can not only improve the testing efficiency, but also avoid the interference of external factors (such as dq/dv values of a battery material system and the like) and reduce the occurrence of missed judgment and false judgment.
A third aspect of the present application provides an electronic device comprising: a memory and a processor; at least one program stored in the memory for, when executed by the processor, causing the processor to perform the corresponding contents of the foregoing method embodiments. Compared with the prior art, can realize: the electronic equipment is characterized in that a battery is connected with an external resistor, the resistance value of the external resistor is changed, the current is changed along with the change of the resistance value of the external resistor, the current comprises the current caused by the external resistor and the current of self-discharge of the battery, the relation between the resistance value of the external resistor and the voltage attenuation rate is established by changing the resistance value of the external resistor, the parameter affecting the voltage attenuation rate is obtained, the current and the voltage attenuation rate are in direct proportion, and therefore the parameter affecting the self-discharge current of the battery is obtained, and the self-discharge current of the battery is obtained according to the open circuit voltage of the battery; in addition, the self-discharge current of the battery can be more intuitively represented by directly testing the self-discharge current of the battery, and compared with the prior art, the self-discharge current of the battery can not only improve the testing efficiency, but also avoid the interference of external factors (such as dq/dv values of a battery material system and the like) and reduce the occurrence of missed judgment and false judgment.
In an alternative embodiment, there is provided an electronic device, as shown in fig. 5, the electronic device 4000 shown in fig. 5 includes: a processor 4001 and a memory 4003. Wherein the processor 4001 is coupled to the memory 4003, such as via a bus 4002. Optionally, the electronic device 4000 may also include a transceiver 4004. It should be noted that, in practical applications, the transceiver 4004 is not limited to one, and the structure of the electronic device 4000 is not limited to the embodiment of the present application.
The processor 4001 may be a CPU (Central Processing Unit ), general purpose processor, DSP (Digital Signal Processor, data signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field Programmable Gate Array, field programmable gate array) or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor 4001 may also be a combination that implements computing functionality, e.g., comprising one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.
Bus 4002 may include a path to transfer information between the aforementioned components. Bus 4002 may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus or an EISA (Extended Industry Standard Architecture ) bus, or the like. The bus 4002 can be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 3, but not only one bus or one type of bus.
Memory 4003 may be, but is not limited to, ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, RAM (Random Access Memory ) or other type of dynamic storage device that can store information and instructions, EEPROM (Electrically Erasable Programmable Read Only Memory ), CD-ROM (Compact Disc Read Only Memory, compact disc Read Only Memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
The memory 4003 is used for storing application program codes for executing the inventive arrangements, and is controlled to be executed by the processor 4001. The processor 4001 is configured to execute application program codes stored in the memory 4003 to realize what is shown in the foregoing method embodiment.
A fourth aspect of embodiments of the present application provides a computer-readable storage medium having stored thereon a computer program which, when run on a computer, causes the computer to perform the corresponding aspects of the method embodiments described above. Compared with the prior art, the computer readable storage medium has the advantages that the battery is connected with the external resistor, the resistance value of the external resistor is changed, the current can be changed along with the change of the resistance value of the external resistor, the current comprises the current caused by the external resistor and the current of self-discharge of the battery, the relation between the resistance value of the external resistor and the voltage decay rate is established by changing the resistance value of the external resistor, the parameter affecting the voltage decay rate is obtained, the current and the voltage decay rate are in direct proportion, the parameter affecting the self-discharge current of the battery is obtained, and the self-discharge current of the battery is obtained according to the open circuit voltage of the battery; in addition, the self-discharge current of the battery can be more intuitively represented by directly testing the self-discharge current of the battery, and compared with the prior art, the self-discharge current of the battery can not only improve the testing efficiency, but also avoid the interference of external factors (such as dq/dv values of a battery material system and the like) and reduce the occurrence of missed judgment and false judgment.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the application.
Claims (10)
1. A battery self-discharge test method, comprising:
acquiring discharge data of q batteries; wherein the discharge data of the battery is Y 1 、Y 2 、…、Y i 、…、Y P ，Y i ＝(1/R i ，K i )，R i Representing the resistance of the ith external resistor of the battery, eachThe resistances of the external resistors are different; k (K) i Represents the voltage decay rate, K, at the ith external resistor i The voltage value of the ith external resistor measured at each collecting time is calculated and obtained by a plurality of different collecting times;
fitting the discharge data to obtain a linear fitting equation K=m× (1/R) +n; wherein K is the voltage decay rate, R is the resistance value of the external resistor, m is the slope, and n is the intercept;
and calculating the self-discharge current of the battery based on the intercept and the slope of the linear fitting equation and the open-circuit voltage of the battery.
2. The battery self-discharge test method according to claim 1, wherein the discharge data of the q batteries are measured under the same environmental parameters including: one or more of temperature, humidity and air pressure.
3. The battery self-discharge test method according to claim 1, wherein 1/R 1 、1/R 2 、…、1/R i 、…、1/R p Is an arithmetic progression distribution.
4. The battery self-discharge test method according to claim 1, wherein the resistance values of the p external resistors are all in a range of 10kΩ to 10mΩ.
5. The method according to claim 1, wherein the time intervals of any two adjacent collecting times among the plurality of different collecting times are equal, and the time interval is between 20 hours and 50 hours.
6. The battery self-discharge test method according to claim 1, further comprising:
comparing the self-discharge currents of the q batteries with a current threshold;
if the self-discharge current of the battery is larger than the current threshold value, the battery is a defective product; and if the self-discharge current of the battery is not greater than the current threshold, the battery is good.
7. The battery self-discharge test method according to claim 6, wherein the current threshold is calculated from the average value and standard deviation of the self-discharge currents of q batteries.
8. A battery self-discharge test device, comprising:
a discharge data acquisition unit configured to acquire discharge data of q batteries; wherein the discharge data of the battery is Y 1 、Y 2 、…、Y i 、…、Y P ，Y i ＝(1/R i ，K i )，R i Representing the resistance value of the ith external resistor of the battery, wherein the resistance values of all the external resistors are different; k (K) i Represents the voltage decay rate, K, at the ith external resistor i The voltage value of the ith external resistor measured at each collecting time is calculated and obtained by a plurality of different collecting times;
a linear fitting unit for fitting the discharge data to obtain a linear fitting equation k=m× (1/R) +n; wherein K is the voltage decay rate, R is the resistance value of the external resistor, m is the slope, and n is the intercept;
and a self-discharge current acquisition unit for calculating the self-discharge current of the battery based on the intercept and the slope of the linear fitting equation and the open-circuit voltage of the battery.
9. An electronic device comprising a memory and a processor, said processor and said memory completing communication with each other via a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1-7.
10. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the method according to any one of claims 1 to 7.
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| CN117347887B (en) * | 2023-12-04 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Method, system and device for testing self-discharge of battery |
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