CN113945740B - Method, device, equipment and storage medium for determining contact resistance - Google Patents
Method, device, equipment and storage medium for determining contact resistanceInfo
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- CN113945740B CN113945740B CN202111375361.0A CN202111375361A CN113945740B CN 113945740 B CN113945740 B CN 113945740B CN 202111375361 A CN202111375361 A CN 202111375361A CN 113945740 B CN113945740 B CN 113945740B
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000012360 testing method Methods 0.000 claims abstract description 177
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 238000010278 pulse charging Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims description 17
- 238000004590 computer program Methods 0.000 claims description 9
- 230000036541 health Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 17
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The application provides a method, a device, equipment and a storage medium for determining contact resistance, wherein the method comprises the following steps: and acquiring test data of the battery system, wherein the test data comprises test data obtained by carrying out pulse charging and/or pulse discharging on the battery system, acquiring the resistance of the battery system according to the test data, and determining the contact resistance of the battery system according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system. The application can conveniently and accurately obtain the contact resistance of the battery system and provide data support for the design analysis of the battery system.
Description
Technical Field
The present application relates to the field of battery systems, and in particular, to a method, an apparatus, a device, and a storage medium for determining a contact resistance.
Background
The contact resistance is the resistance exhibited between conductors. The contact resistance of the battery system can affect external characteristics such as current, voltage, temperature, etc. of the battery system, and can affect capacity, energy performance, charge-discharge efficiency, and uniformity performance of power of the battery system in charge-discharge operation.
At present, the contact resistance of a battery system as a lithium ion battery pack can be obtained by the following ways: confirming short pulse discharge time t and a current threshold according to lithium ion battery characteristics; selecting a current lower than a current threshold value to perform short pulse discharge on the lithium ion battery pack; when the voltage detection circuit is used for measuring the voltage change of each battery end in the lithium ion battery pack during short pulse discharge, the contact resistance is obtained. The contact resistance of the battery system obtained by the above manner is not accurate enough.
Disclosure of Invention
The application provides a method, a device, equipment and a storage medium for determining contact resistance, which are used for solving the problem that the contact resistance of a battery system obtained by the prior art is not accurate enough.
In a first aspect, the present application provides a method for determining a contact resistance, including:
Acquiring test data of a battery system, wherein the test data comprises test data obtained by pulse charging and/or pulse discharging the battery system;
acquiring the resistance of the battery system according to the test data;
The contact resistance of the battery system is determined according to the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system.
Optionally, obtaining the resistance of the battery system according to the test data includes: according to the test data, acquiring a first voltage, a second voltage and a pulse current corresponding to the battery system, wherein the first voltage is a voltage before pulse charging of the battery system, the second voltage is a voltage after pulse charging of the battery system, or the first voltage is a voltage before pulse discharging of the battery system, and the second voltage is a voltage after pulse discharging of the battery system; and obtaining the resistance of the battery system according to the voltage difference between the first voltage and the second voltage and the pulse current.
Optionally, before determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system, the method for determining the contact resistance further includes: the cell resistance is determined by at least one of: according to the test data and the battery system parameters, the resistance of the single battery is obtained, and the battery system parameters comprise the corresponding resistance of the single battery under different test conditions; measuring to obtain the resistance of the single battery; and obtaining the resistance of the single battery provided by the provider.
Optionally, obtaining the resistance of the single battery according to the test data and the battery system parameters includes: and inquiring parameters Of the battery system according to test data, and determining the resistance Of the single battery in the battery system, wherein the test data comprises at least one Of the voltage, the current, the temperature, the State Of Charge (SOC) and the State Of Health (SOH) Of the battery system in the test process.
Optionally, before determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system, the method for determining the contact resistance further includes: the resistance of the electrical component within the battery system is determined by at least one of: acquiring the resistance of an electric component in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electric component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process; measuring to obtain the resistance of the electrical components in the battery system; the electrical resistance of the electrical components within the battery system provided by the provider is obtained.
Optionally, before determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system, the method for determining the contact resistance further includes: acquiring the resistivity of an electrical component in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistivity of the corresponding electrical component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process; acquiring the size of an electrical component in the battery system; the product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system is determined to be the resistance of the electrical component within the battery system.
In a second aspect, the present application provides a device for determining a contact resistance, comprising:
The first acquisition module is used for acquiring test data of the battery system, wherein the test data comprise test data obtained by pulse charging and/or pulse discharging of the battery system;
the second acquisition module is used for acquiring the resistance of the battery system according to the test data;
And the determining module is used for determining the contact resistance of the battery system according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system.
Optionally, the second obtaining module is specifically configured to: according to the test data, acquiring a first voltage, a second voltage and a pulse current corresponding to the battery system, wherein the first voltage is a voltage before pulse charging of the battery system, the second voltage is a voltage after pulse charging of the battery system, or the first voltage is a voltage before pulse discharging of the battery system, and the second voltage is a voltage after pulse discharging of the battery system; and obtaining the resistance of the battery system according to the voltage difference between the first voltage and the second voltage and the pulse current.
Optionally, the determining module is further configured to: before determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric components in the battery system, determining the resistance of the single battery by at least one of the following modes: according to the test data and the battery system parameters, the resistance of the single battery is obtained, and the battery system parameters comprise the corresponding resistance of the single battery under different test conditions; measuring to obtain the resistance of the single battery; and obtaining the resistance of the single battery provided by the provider.
Optionally, the determining module is configured to, when configured to obtain the resistance of the single battery according to the test data and the battery system parameter, specifically: and inquiring parameters of the battery system according to test data, and determining the resistance of the single battery in the battery system, wherein the test data comprises at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process.
Optionally, the determining module is further configured to: before determining the contact resistance of the battery system based on the difference between the resistance of the battery system and the resistance of the battery cells and the resistance of the electrical components in the battery system, the resistance of the electrical components in the battery system is determined by at least one of: acquiring the resistance of an electric component in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electric component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process; measuring to obtain the resistance of the electrical components in the battery system; the electrical resistance of the electrical components within the battery system provided by the provider is obtained.
Optionally, the determining module is further configured to: before determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of a single battery in the battery system and the resistance of an electric component in the battery system, acquiring the resistivity of the electric component in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistivity of the corresponding electric component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process; acquiring the size of an electrical component in the battery system; the product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system is determined to be the resistance of the electrical component within the battery system.
In a third aspect, the present application provides an electronic device comprising: a processor, a memory communicatively coupled to the processor;
The memory stores computer-executable instructions;
the processor executes computer-executable instructions stored in the memory to implement the method of determining a contact resistance according to the first aspect of the present application.
In a fourth aspect, the present application provides a computer readable storage medium having stored therein computer program instructions which, when executed by a processor, implement a method for determining a contact resistance according to the first aspect of the present application.
In a fifth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements a method for determining a contact resistance according to the first aspect of the present application.
According to the method, the device, the equipment and the storage medium for determining the contact resistance, the test data of the battery system are obtained, the test data comprise the test data obtained by carrying out pulse charging and/or pulse discharging on the battery system, the resistance of the battery system is obtained according to the test data, and the contact resistance of the battery system is determined according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric part in the battery system. According to the application, the resistance of the electrical component in the battery system is considered, and the contact resistance of the battery system is determined according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system, so that the contact resistance of the battery system can be conveniently and accurately obtained, and data support is provided for design analysis of the battery system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;
FIG. 2 is a flow chart of a method for determining contact resistance according to an embodiment of the present application;
FIG. 3 is a flow chart of a method for determining contact resistance according to another embodiment of the present application;
Fig. 4 (a) is a schematic diagram of SOC of a single battery included in the battery pack 1 according to an embodiment of the present application;
Fig. 4 (b) is a schematic diagram of SOC of a unit cell included in the battery pack 2 according to an embodiment of the present application;
fig. 4 (c) is a schematic diagram of SOC of a single battery included in the battery pack 3 according to an embodiment of the present application;
Fig. 5 (a) is a schematic diagram illustrating the resistance of a single battery included in the battery pack 1 according to an embodiment of the present application;
fig. 5 (b) is a schematic diagram illustrating the resistance of the unit cells included in the battery pack 2 according to an embodiment of the present application;
Fig. 5 (c) is a schematic diagram illustrating the resistance of the unit cells included in the battery pack 3 according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a device for determining contact resistance according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The current method for obtaining the contact resistance of the battery system, which is a lithium ion battery pack, is not accurate enough, and is not applicable to other types of battery systems, is not applicable to pulse discharge tests, and is not applicable to pulse charge tests.
Based on the above problems, the application provides a method, a device, equipment and a storage medium for determining a contact resistance, which are used for conveniently and accurately obtaining the contact resistance of a battery system by obtaining test data corresponding to pulse charge or pulse discharge of the battery system and considering the influence of the resistance of an electric part contained in the battery system on the contact resistance of the battery system.
In the following, first, an application scenario of the solution provided by the present application is illustrated.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application. As shown in fig. 1, in the present application scenario, the server 102 obtains test data of the battery system from the client 101, the server 102 determines a contact resistance of the battery system according to the test data of the battery system, and sends the contact resistance of the battery system to the client 101, and the client 101 displays the contact resistance of the battery system. The specific implementation process of determining the contact resistance of the battery system by the server 102 according to the test data of the battery system may be referred to as the following schemes of various embodiments.
It should be noted that fig. 1 is only a schematic diagram of an application scenario provided by an embodiment of the present application, and the embodiment of the present application does not limit the devices included in fig. 1 or limit the positional relationship between the devices in fig. 1. For example, in the application scenario shown in fig. 1, a data storage device may be an external memory with respect to the client 101 or the server 102, or an internal memory integrated into the client 101 or the server 102.
Next, a method of determining contact resistance is described by way of specific examples.
Fig. 2 is a flowchart of a method for determining contact resistance according to an embodiment of the present application. The method of the embodiment of the application can be applied to electronic equipment, and the electronic equipment can be a client 101 or a server 102 shown in fig. 1, a server cluster or the like. As shown in fig. 2, the method of the embodiment of the present application includes:
s201, test data of the battery system are obtained, wherein the test data comprise test data obtained by pulse charging and/or pulse discharging of the battery system.
In the embodiment of the application, the battery system comprises at least one of a battery module, a battery plug box, a battery pack, a battery unit and an energy storage system, and the application is not limited by the above. The test data of the battery system may include test data obtained by pulse charging the battery system, or test data obtained by pulse discharging the battery system, or test data obtained by pulse charging and pulse discharging the battery system. Specific test data include, for example, current, voltage, temperature, SOC, and SOH of the battery system, and the present application is not limited thereto.
The test data of the battery system may be input by a user to the electronic device performing the method embodiment or transmitted by other devices to the electronic device performing the method embodiment. For example, if the battery system is a battery system of an electric automobile, the electric automobile uploads test data of the battery system to the cloud server, and the electronic device executing the embodiment of the method can directly obtain the test data of the battery system from the server. It will be appreciated that the current, voltage and temperature used when performing a pulse charge test or a pulse discharge test on a battery system should be within the allowable test conditions for the batteries and electrical components within the battery system. For example, the maximum current allowed by an electrical component in the battery system is 500A, the current used in the pulsed discharge test of the electrical component cannot be greater than 500A.
S202, acquiring the resistance of the battery system according to the test data.
In this step, after the test data of the battery system is obtained, the resistance of the battery system may be obtained based on the test data. For how to obtain the resistance of the battery system according to the test data, reference may be made to the following embodiments, which are not described herein.
And S203, determining the contact resistance of the battery system according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric components in the battery system.
In this step, the electrical components in the battery system include at least one of a wire harness, a board card, a copper-aluminum bar, and a bolt of the battery system, which is not limited in the present application. The resistance of the unit cells in the battery system and the resistance of the electrical components in the battery system can be obtained in various manners, and for how to obtain the resistance of the unit cells in the battery system and the resistance of the electrical components in the battery system, reference may be made to the following embodiments, which are not described herein.
After the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electric component in the battery system are obtained, the contact resistance of the battery system can be determined as the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system, namely the contact resistance of the battery system is the resistance value of the battery system minus the resistance of the single battery in the battery system, and then the resistance of the electric component in the battery system is subtracted. It can be understood that if the battery system includes a plurality of cell resistances and a plurality of electrical components, for example, the battery system includes 100 cell resistances and 5 electrical components, the contact resistance of the battery system is the resistance value of the battery system minus the 100 cell resistances in the battery system, and minus the resistance of the 5 electrical components in the battery system. Alternatively, the contact resistance may be the contact resistance of any two or more components of the circuit in the battery system or a sum thereof. For example, the battery system is a battery pack, and the battery pack contains 10 battery modules, so that the total contact resistance of the 10 battery modules in the battery pack can be calculated, and the contact resistance of any two battery modules can be calculated.
According to the method for determining the contact resistance, the test data of the battery system are obtained, the test data comprise the test data obtained by carrying out pulse charging and/or pulse discharging on the battery system, the resistance of the battery system is obtained according to the test data, and the contact resistance of the battery system is determined according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system. According to the embodiment of the application, the resistance of the electrical component in the battery system is considered, and the contact resistance of the battery system is determined according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system, so that the contact resistance of the battery system can be conveniently and accurately obtained, and data support is provided for design analysis of the battery system.
Fig. 3 is a flowchart of a method for determining a contact resistance according to another embodiment of the present application. On the basis of the above embodiments, the embodiments of the present application will be further described on how to determine the contact resistance of the battery system. As shown in fig. 3, the method of the embodiment of the present application may include:
S301, acquiring test data of a battery system, wherein the test data comprise test data obtained by pulse charging and/or pulse discharging of the battery system.
A detailed description of this step may be referred to the related description of S201 in the embodiment shown in fig. 2, and will not be repeated here.
In the embodiment of the present application, step S202 in fig. 2 may further include two steps, S302 and S303, as follows:
s302, acquiring a first voltage, a second voltage and a pulse current corresponding to the battery system according to the test data.
The first voltage is the voltage before pulse charging of the battery system, the second voltage is the voltage after pulse charging of the battery system, or the first voltage is the voltage before pulse discharging of the battery system, and the second voltage is the voltage after pulse discharging of the battery system.
In this step, if the test data is obtained by pulse charging the battery system, the first voltage before pulse charging the battery system, the second voltage after pulse charging the battery system, and the pulse current when pulse charging the battery system can be obtained from the test data. If the test data is obtained by pulse discharging the battery system, the first voltage before pulse discharging the battery system, the second voltage after pulse discharging the battery system, and the pulse current when pulse discharging the battery system can be obtained from the test data.
S303, obtaining the resistance of the battery system according to the voltage difference between the first voltage and the second voltage and the pulse current.
After the first voltage, the second voltage and the pulse current corresponding to the battery system are obtained according to the test data, the resistance of the battery system can be obtained according to the voltage difference between the first voltage and the second voltage and the pulse current. Specifically, the voltage difference between the first voltage and the second voltage divided by the pulse current is the resistance of the battery system.
S304, determining the resistance of the single battery in the battery system by at least one of the following modes: obtaining the resistance of the single battery according to the test data and the battery system parameters; measuring to obtain the resistance of the single battery; and obtaining the resistance of the single battery provided by the provider.
The battery system parameters include corresponding cell resistances under different test conditions, specifically, for example, cell resistances obtained under different voltage, current, temperature, SOC and SOH test conditions, and may also be understood as corresponding relations between cell resistances and different test conditions, where the corresponding relations may be stored in corresponding data tables of the database. The battery system parameters may also include the grouping of the battery system components, which in turn may determine the number of cells contained within the battery system.
In one possible embodiment, after the test data of the battery system is obtained, the resistance of the single battery may be obtained according to the test data and the parameters of the battery system. Further, obtaining the resistance of the single battery according to the test data and the battery system parameters may include: and inquiring parameters of the battery system according to test data, and determining the resistance of the single battery in the battery system, wherein the test data comprises at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process.
The voltage, the current, the temperature, the SOC and the SOH of the battery system in the test process can be obtained according to the test data, and then the parameters of the battery system can be queried according to the obtained voltage, the current, the temperature, the SOC and the SOH, the corresponding relation between the obtained voltage, the current, the temperature, the SOC and the SOH and the resistance of the single battery can be determined, and the resistance of the single battery in the battery system can be further determined. If the battery system parameters are queried according to the obtained voltage, current, temperature, SOC and SOH, and the corresponding single battery resistance is not found, the corresponding single battery resistance can be obtained by interpolation.
In another possible embodiment, the resistance of the single battery can be obtained by directly measuring through a multimeter, a resistance meter and the like based on different testing conditions.
In another possible embodiment, the cell resistance provided by the provider may be obtained, where the provider is the provider of the cell, and it can be understood that the cell resistance provided by the provider is the corresponding cell resistance under different test conditions.
S305, determining the resistance of the electrical component in the battery system by at least one of the following means: acquiring the resistance of an electrical component in the battery system according to the test data and the battery system parameters; measuring to obtain the resistance of the electrical components in the battery system; the electrical resistance of the electrical components within the battery system provided by the provider is obtained.
The battery system parameters include the resistances of the corresponding electrical components under different test conditions, specifically, for example, the resistances of the electrical components obtained under different voltage, current and temperature test conditions, and may also be understood as the corresponding relationship between the resistances of the electrical components and different test conditions, where the corresponding relationship may be stored in a corresponding data table of the database. All electrical components contained within the battery system may also be determined based on the grouping of the various portions of the battery system that are included in the battery system parameters. The test data includes at least one of voltage, current, temperature, SOC, and SOH of the battery system during the test.
In one possible embodiment, after the test data of the battery system is obtained, the voltage, the current and the temperature of the battery system in the test process can be obtained according to the test data, and then the parameters of the battery system can be queried according to the obtained voltage, current and temperature to obtain the resistance of the electrical components in the battery system. If the parameters of the battery system are queried according to the obtained voltage, current and temperature, and the resistance of the corresponding electrical component is not found, the resistance of the corresponding electrical component can be obtained by interpolation.
In another possible embodiment, the resistance of the electrical components in the battery system may be measured directly by a multimeter, a resistance meter, or the like, based on different test conditions.
In another possible embodiment, the electrical resistance of the electrical component in the battery system provided by the provider may be obtained, where the provider is the provider of the electrical component, and it is understood that the electrical resistance of the electrical component in the battery system provided by the provider is the electrical resistance of the corresponding electrical component under different test conditions.
On the basis of the above-described embodiments, the resistance of each electrical component included in the battery system can be obtained, and thus the sum of the resistances of each electrical component included in the battery system can be determined.
Optionally, according to the test data and the battery system parameters, the resistivity of the electrical components in the battery system is obtained, the battery system parameters comprise the resistivity of the corresponding electrical components under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process; acquiring the size of an electrical component in the battery system; the product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system is determined to be the resistance of the electrical component within the battery system.
The battery system parameters include the resistivity of the electrical components corresponding to different test conditions, specifically, for example, the resistivity of the electrical components obtained under different voltage, current and temperature test conditions, and may be understood as the corresponding relationship between the resistivity of the electrical components and different test conditions, where the corresponding relationship may be stored in a corresponding data table of the database. After the test data of the battery system are obtained, the voltage, the current and the temperature of the battery system in the test process can be obtained according to the test data, and then the parameters of the battery system can be inquired according to the obtained voltage, current and temperature, so that the resistivity of electric components in the battery system is obtained. If the parameters of the battery system are queried according to the obtained voltage, current and temperature, and the resistivity of the corresponding electrical component is not found, the resistivity of the corresponding electrical component can be obtained by interpolation. If the electrical component in the battery system is a standard component, the corresponding size can be obtained from the battery system parameters, and if the electrical component in the battery system is not a standard component, such as a wire harness, the size of the electrical component can be measured.
After the resistivity and the size of the electric component in the battery system are obtained, the product of the resistivity of the electric component in the battery system and the size of the electric component in the battery system can be determined as the resistance of the electric component in the battery system.
S306, determining the contact resistance of the battery system according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric components in the battery system.
A detailed description of this step may be referred to the related description of S203 in the embodiment shown in fig. 2, and will not be repeated here.
According to the method for determining the contact resistance, provided by the embodiment of the application, the test data of the battery system are obtained, wherein the test data comprise the test data obtained by pulse charging and/or pulse discharging of the battery system; acquiring a first voltage, a second voltage and a pulse current corresponding to the battery system according to the test data; obtaining the resistance of the battery system according to the voltage difference between the first voltage and the second voltage and the pulse current; determining cell resistance within the battery system: determining a resistance of an electrical component within the battery system; the contact resistance of the battery system is determined according to the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system. According to the embodiment of the application, the resistance of the electrical component in the battery system is considered, and the contact resistance of the battery system is determined according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system, so that the contact resistance of the battery system can be conveniently and accurately obtained, and data support is provided for design analysis of the battery system.
On the basis of the above-described embodiment, it is exemplarily assumed that a battery unit includes 3 battery packs, each of which includes 240 unit cells, and each of which can be understood as the battery system in the above-described embodiment. And performing pulse discharge test on each battery pack to obtain test data of each battery pack. External characteristic data of the battery cells shown in table 1 can be obtained from the test data of each battery pack.
TABLE 1
| External characteristics | Battery pack 1 | Battery pack 2 | Battery pack 3 |
| Total voltage/V before discharge | 801.3 | 801.5 | 801.5 |
| Total voltage/V after discharge | 781.1 | 781.1 | 780.9 |
| Discharge current/A | 170.18 | 171.33 | 173.23 |
Taking battery pack 1 as an example based on table 1, from the total voltage 801.3V before pulse discharge, the total voltage 781.1V after pulse discharge, and the pulse discharge current 170.18a of battery pack 1, the resistance of battery pack 1 can be obtained as: (801.3-781.1)/170.18 mΩ, namely 118.70mΩ. By analogy, it is possible to obtain a resistance of 119.07mΩ for battery pack 2 and 118.92mΩ for battery pack 3.
Open circuit voltage (Open Circuit Voltage, OCV) and SOH of the unit cells included in each battery pack can be obtained from the test data of each battery pack, and thus SOC of the unit cells can be obtained. Fig. 4 (a) is a schematic diagram of the SOC of the unit cell included in the battery pack 1 according to an embodiment of the present application, fig. 4 (b) is a schematic diagram of the SOC of the unit cell included in the battery pack 2 according to an embodiment of the present application, and fig. 4 (c) is a schematic diagram of the SOC of the unit cell included in the battery pack 3 according to an embodiment of the present application. As shown in fig. 4 (a) to 4 (c), the abscissa represents the numbers corresponding to 240 unit cells included in each battery pack, the ordinate represents the SOCs respectively corresponding to 240 unit cells, and fig. 4 (a) to 4 (c) show the SOCs of each unit cell included in each battery pack. The resistance of the unit cells included in each battery pack can then be obtained from the voltage, current, temperature, SOC, and SOH included in the test data of each battery pack. Fig. 5 (a) is a schematic diagram of the resistance of the unit cells included in the battery pack 1 according to an embodiment of the present application, fig. 5 (b) is a schematic diagram of the resistance of the unit cells included in the battery pack 2 according to an embodiment of the present application, and fig. 5 (c) is a schematic diagram of the resistance of the unit cells included in the battery pack 3 according to an embodiment of the present application. As shown in fig. 5 (a) to 5 (c), the abscissa represents the numbers corresponding to 240 unit cells included in each battery pack, the ordinate represents the resistances corresponding to 240 unit cells, respectively, and fig. 5 (a) to 5 (c) show the resistances of each unit cell included in each battery pack. Based on the resistance of each unit cell included in each battery pack, the sum of the respective unit cell resistances corresponding to the battery pack 1, the battery pack 2, and the battery pack 3 can be obtained as follows: 107.40mΩ, 108.66mΩ, 108.40mΩ.
In the battery unit, according to data provided by a supplier, rated total resistance of electric components such as a connecting piece, a copper-aluminum bar, a board card and the like which are respectively contained in the battery pack 1, the battery pack 2 and the battery pack 3 can be obtained to be 9mΩ. The resistivity of the wire harness adopted by each battery pack in a test environment is 0.0754mΩ/m, and the wire harness lengths of the battery pack 1, the battery pack 2 and the battery pack 3 are respectively: 6.54m, 4.54m, 6.04m. Taking the wire harness contained in the battery pack 1 as an example, the wire harness resistance of the battery pack 1 can be obtained as follows: 0.0754 x 6.54mΩ, i.e. 0.49mΩ. By analogy, the harness resistances of the battery pack 2 and the battery pack 3 can be obtained as follows: 0.34mΩ, 0.46mΩ.
From the above data, taking the wire harness included in the battery pack 1 as an example, the contact resistance of the battery pack 1 can be obtained as: (118.70-107.40-0.49-9) mΩ, i.e. 1.81mΩ. By analogy, the contact resistances of the battery pack 2 and the battery pack 3 can be obtained as follows: 1.07mΩ, 1.06mΩ.
The following are examples of the apparatus of the present application that may be used to perform the method embodiments of the present application. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the method of the present application.
Fig. 6 is a schematic structural diagram of a device for determining contact resistance according to an embodiment of the present application, and as shown in fig. 6, a device 600 for determining contact resistance according to an embodiment of the present application includes: a first acquisition module 601, a second acquisition module 602, and a determination module 603. Wherein:
the first obtaining module 601 is configured to obtain test data of the battery system, where the test data includes test data obtained by pulse charging and/or pulse discharging the battery system.
And a second obtaining module 602, configured to obtain the resistance of the battery system according to the test data.
A determining module 603 is configured to determine a contact resistance of the battery system according to a difference between a resistance of the battery system and a resistance of a single battery in the battery system and a resistance of an electrical component in the battery system.
In some embodiments, the second obtaining module 602 may be specifically configured to: according to the test data, acquiring a first voltage, a second voltage and a pulse current corresponding to the battery system, wherein the first voltage is a voltage before pulse charging of the battery system, the second voltage is a voltage after pulse charging of the battery system, or the first voltage is a voltage before pulse discharging of the battery system, and the second voltage is a voltage after pulse discharging of the battery system; and obtaining the resistance of the battery system according to the voltage difference between the first voltage and the second voltage and the pulse current.
In some embodiments, the determination module 603 may also be configured to: before determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric components in the battery system, determining the resistance of the single battery by at least one of the following modes: according to the test data and the battery system parameters, the resistance of the single battery is obtained, and the battery system parameters comprise the corresponding resistance of the single battery under different test conditions; measuring to obtain the resistance of the single battery; and obtaining the resistance of the single battery provided by the provider.
Optionally, the determining module 603 may be specifically configured to, when configured to obtain the resistance of the single battery according to the test data and the battery system parameter: and inquiring parameters of the battery system according to test data, and determining the resistance of the single battery in the battery system, wherein the test data comprises at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process.
In some embodiments, the determination module 603 may also be configured to: before determining the contact resistance of the battery system based on the difference between the resistance of the battery system and the resistance of the battery cells and the resistance of the electrical components in the battery system, the resistance of the electrical components in the battery system is determined by at least one of: acquiring the resistance of an electric component in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electric component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process; measuring to obtain the resistance of the electrical components in the battery system; the electrical resistance of the electrical components within the battery system provided by the provider is obtained.
Optionally, the determining module 603 may further be configured to: before determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of a single battery in the battery system and the resistance of an electric component in the battery system, acquiring the resistivity of the electric component in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistivity of the corresponding electric component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process; acquiring the size of an electrical component in the battery system; the product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system is determined to be the resistance of the electrical component within the battery system.
The device of the present embodiment may be used to execute the technical solution of any of the above-described method embodiments, and its implementation principle and technical effects are similar, and are not described herein again.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device may be provided as a server or computer, for example. Referring to fig. 7, an electronic device 700 includes a processing component 701 further including one or more processors and memory resources represented by memory 702 for storing instructions, such as applications, executable by the processing component 701. The application program stored in the memory 702 may include one or more modules each corresponding to a set of instructions. Further, the processing component 701 is configured to execute instructions to perform any of the method embodiments described above.
The electronic device 700 may also include a power supply component 703 configured to perform power management of the electronic device 700, a wired or wireless network interface 704 configured to connect the electronic device 700 to a network, and an input output (I/O) interface 705. The electronic device 700 may operate based on an operating system stored in the memory 702, such as Windows Server, mac OS XTM, unixTM, linuxTM, freeBSDTM, or the like.
The application also provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and when the processor executes the computer execution instructions, the scheme of the method for determining the contact resistance is realized.
The application also provides a computer program product comprising a computer program which, when executed by a processor, implements the solution of the method of determining a contact resistance as above.
The computer readable storage medium described above may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk. A readable storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. In the alternative, the readable storage medium may be integral to the processor. The processor and the readable storage medium may reside in an Application SPECIFIC INTEGRATED Circuits (ASIC). The processor and the readable storage medium may also be present as discrete components in the means for determining the contact resistance.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (9)
1. A method of determining a contact resistance, comprising:
Acquiring test data of a battery system, wherein the test data comprises test data obtained by pulse charging and/or pulse discharging the battery system;
acquiring the resistance of the battery system according to the test data;
Determining a contact resistance of the battery system according to a difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system;
before determining the contact resistance of the battery system according to the difference value between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electric component in the battery system, the method further comprises:
the cell resistance is determined by at least one of:
acquiring the single battery resistance according to the test data and battery system parameters, wherein the battery system parameters comprise the corresponding single battery resistances under different test conditions; the test data comprises at least one of voltage, current, temperature, state of charge (SOC) and state of health (SOH) of the battery system during a test;
Measuring to obtain the resistance of the single battery;
and obtaining the single battery resistance provided by a provider.
2. The method for determining a contact resistance according to claim 1, wherein the acquiring the resistance of the battery system based on the test data includes:
According to the test data, acquiring a first voltage, a second voltage and a pulse current corresponding to the battery system, wherein the first voltage is a voltage before pulse charging of the battery system, the second voltage is a voltage after pulse charging of the battery system, or the first voltage is a voltage before pulse discharging of the battery system, and the second voltage is a voltage after pulse discharging of the battery system;
and obtaining the resistance of the battery system according to the voltage difference between the first voltage and the second voltage and the pulse current.
3. The method for determining a contact resistance according to claim 1, wherein the obtaining the cell resistance according to the test data and the battery system parameter comprises:
and inquiring the parameters of the battery system according to the test data, and determining the resistance of the single battery in the battery system.
4. The method according to claim 1 or 2, characterized in that before the determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of the unit cells in the battery system and the resistance of the electric components in the battery system, further comprising:
determining the resistance of an electrical component within the battery system by at least one of:
Acquiring the resistance of an electrical component in the battery system according to the test data and the battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electrical component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process;
Measuring and obtaining the resistance of an electrical component in the battery system;
the electrical resistance of the electrical components within the battery system provided by the provider is obtained.
5. The method according to claim 1 or 2, characterized in that before the determining the contact resistance of the battery system according to the difference between the resistance of the battery system and the resistance of the unit cells in the battery system and the resistance of the electric components in the battery system, further comprising:
Acquiring the resistivity of an electrical component in the battery system according to the test data and the battery system parameters, wherein the battery system parameters comprise the resistivity of the corresponding electrical component under different test conditions, and the test data comprise at least one of voltage, current, temperature, SOC and SOH of the battery system in the test process;
acquiring the size of an electrical component in the battery system;
determining a product of a resistivity of an electrical component within the battery system and a size of the electrical component within the battery system as a resistance of the electrical component within the battery system.
6. A contact resistance determining apparatus, comprising:
the first acquisition module is used for acquiring test data of the battery system, wherein the test data comprises test data obtained by pulse charging and/or pulse discharging of the battery system;
The second acquisition module is used for acquiring the resistance of the battery system according to the test data;
A determining module, configured to determine a contact resistance of the battery system according to a difference between a resistance of the battery system and a resistance of a single battery in the battery system and a resistance of an electrical component in the battery system;
The determining module is further configured to determine the resistance of the single battery before determining the contact resistance of the battery system according to a difference between the resistance of the battery system and the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system, by at least one of the following manners:
acquiring the single battery resistance according to the test data and battery system parameters, wherein the battery system parameters comprise the corresponding single battery resistances under different test conditions; the test data comprises at least one of voltage, current, temperature, state of charge (SOC) and state of health (SOH) of the battery system during a test; measuring to obtain the resistance of the single battery; and obtaining the single battery resistance provided by a provider.
7. An electronic device, comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored in the memory to implement the method of determining contact resistance as claimed in any one of claims 1 to 5.
8. A computer-readable storage medium, in which computer program instructions are stored which, when executed by a processor, implement the method of determining a contact resistance according to any one of claims 1 to 5.
9. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the method of determining a contact resistance according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375361.0A CN113945740B (en) | 2021-11-19 | Method, device, equipment and storage medium for determining contact resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375361.0A CN113945740B (en) | 2021-11-19 | Method, device, equipment and storage medium for determining contact resistance |
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| CN113945740A CN113945740A (en) | 2022-01-18 |
| CN113945740B true CN113945740B (en) | 2024-07-09 |
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| CN105807230A (en) * | 2016-03-11 | 2016-07-27 | 郑贵林 | Storage battery residual capacity and health state rapid detection method and device |
| CN207366636U (en) * | 2017-09-07 | 2018-05-15 | 深圳市卓能新能源股份有限公司 | Battery pole piece resistance testing device |
| CN113495227A (en) * | 2020-04-03 | 2021-10-12 | 郑州深澜动力科技有限公司 | Test system for electrical connection in battery system |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105807230A (en) * | 2016-03-11 | 2016-07-27 | 郑贵林 | Storage battery residual capacity and health state rapid detection method and device |
| CN207366636U (en) * | 2017-09-07 | 2018-05-15 | 深圳市卓能新能源股份有限公司 | Battery pole piece resistance testing device |
| CN113495227A (en) * | 2020-04-03 | 2021-10-12 | 郑州深澜动力科技有限公司 | Test system for electrical connection in battery system |
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