CN113945740A - Method, device and equipment for determining contact resistance and storage medium - Google Patents
Method, device and equipment for determining contact resistance and storage medium Download PDFInfo
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- CN113945740A CN113945740A CN202111375361.0A CN202111375361A CN113945740A CN 113945740 A CN113945740 A CN 113945740A CN 202111375361 A CN202111375361 A CN 202111375361A CN 113945740 A CN113945740 A CN 113945740A
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- 238000000034 method Methods 0.000 title claims abstract description 70
- 238000012360 testing method Methods 0.000 claims abstract description 173
- 238000010278 pulse charging Methods 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 9
- 230000036541 health Effects 0.000 claims description 2
- 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 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 241001089723 Metaphycus omega Species 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 2
- 238000013500 data storage Methods 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
- 238000001514 detection method Methods 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
Abstract
The application provides a method, a device, equipment and a storage medium for determining contact resistance, wherein the method comprises the following steps: the method comprises the steps of obtaining 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, obtaining 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 a single battery in the battery system and the resistance of an electric element in the battery system. The battery system contact resistance acquisition method and device can conveniently and accurately acquire the contact resistance of the battery system, and provide data support for design and analysis of the battery system.
Description
Technical Field
The present disclosure 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
Contact resistance is the resistance presented between conductors. The contact resistance of the battery system can affect external characteristics of the battery system, such as current, voltage, temperature, and the like, and can affect the capacity, energy expression, charge and discharge efficiency, and power uniformity expression of the charge and discharge operation of the battery system.
At present, the contact resistance of the battery system as a lithium ion battery pack can be obtained as follows: confirming short pulse discharge time t and a current threshold according to the characteristics of the lithium ion battery; selecting current lower than a current threshold value to perform short-pulse discharge on the lithium ion battery pack; and when the voltage detection circuit is used for measuring the short pulse discharge, the voltage change of the terminal of each battery in the lithium ion battery pack is used for obtaining the contact resistance. The contact resistance of the battery system obtained in 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 contact resistance, comprising:
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 of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical components 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 is carried out on the battery system, and the second voltage is a voltage after pulse charging is carried out on the battery system, or the first voltage is a voltage before pulse discharging is carried out on the battery system, and the second voltage is a voltage after pulse discharging is carried out on 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 electrical component in the battery system, the method for determining the contact resistance further includes: determining the cell resistance by at least one of: acquiring the resistance of the single battery according to the test data and the battery system parameters, wherein 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 acquiring 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 parameter 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 voltage, current, temperature, State Of Charge (SOC) and 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 electrical component in the battery system, the method for determining the contact resistance further includes: determining a resistance of an electrical component within the battery system by at least one of: acquiring the resistance of an electrical part in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electrical part 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 the resistance of an electrical component in the battery system; the resistance of an electrical component in a battery system provided by a 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 electrical component in the battery system, the method for determining the contact resistance further includes: acquiring the resistivity of an electrical part in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistivity of the corresponding electrical part 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; obtaining the size of an electrical component in the battery system; determining a product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system as a resistance of the electrical component within the battery system.
In a second aspect, the present application provides a contact resistance determining apparatus comprising:
the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring test data of the battery system, and the test data comprises test data obtained by carrying out pulse charging and/or pulse discharging on the battery system;
the second acquisition module is used for acquiring the resistance of the battery system according to the test data;
the determining module is used for determining the contact resistance of the battery system according to the difference value of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical 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 is carried out on the battery system, and the second voltage is a voltage after pulse charging is carried out on the battery system, or the first voltage is a voltage before pulse discharging is carried out on the battery system, and the second voltage is a voltage after pulse discharging is carried out on 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 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 components in the battery system, determining the resistance of the single battery by at least one of the following modes: acquiring the resistance of the single battery according to the test data and the battery system parameters, wherein 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 acquiring the resistance of the single battery provided by the provider.
Optionally, the determining module is specifically configured to, when obtaining 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.
Optionally, the determining module is further configured to: 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 electrical components in the battery system, determining the resistance of the electrical components in the battery system by at least one of the following modes: acquiring the resistance of an electrical part in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electrical part 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 the resistance of an electrical component in the battery system; the resistance of an electrical component in a battery system provided by a 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 electrical component in the battery system, acquiring the resistivity of the 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; obtaining the size of an electrical component in the battery system; determining a product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system as a resistance of the electrical component within the battery system.
In a third aspect, the present application provides 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 described in the first aspect of the present application.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon computer program instructions, which, when executed by a processor, implement the method for determining 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 the method of determining contact resistance as described in 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 of the resistance of the battery system, the resistance of a single battery in the battery system and the resistance of an electric part in the battery system. Because the resistance of the electrical part in the battery system is considered, and the contact resistance of the battery system is determined according to the difference value of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical part in the battery system, the contact resistance of the battery system can be conveniently and accurately obtained, and data support is provided for design and analysis of the battery system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;
fig. 2 is a flowchart of a method for determining contact resistance according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a method for determining contact resistance according to another embodiment of the present application;
fig. 4(a) is a schematic diagram of the SOC of a single battery included in the battery pack 1 provided in an embodiment of the present application;
fig. 4(b) is a schematic diagram of the SOC of a single battery included in the battery pack 2 according to an embodiment of the present application;
fig. 4(c) is a schematic diagram of the SOC of the unit cells included in the battery pack 3 according to an embodiment of the present application;
fig. 5(a) is a schematic diagram of 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 of the resistance of the single battery included in the battery pack 2 according to an embodiment of the present application;
fig. 5(c) is a schematic diagram of the resistance of the single battery included in the battery pack 3 according to an embodiment 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 disclosure;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The contact resistance of the battery system obtained by the current method for obtaining the contact resistance of the battery system for the lithium ion battery pack is not accurate enough, and in addition, the method is limited to the lithium ion battery pack, is not suitable for other types of battery systems, is limited to pulse discharge tests, and is not suitable for pulse charge tests.
Based on the above problems, the present application provides a method, an apparatus, a device, 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 charging or pulse discharging of the battery system and considering the influence of the resistance of an electrical component included in the battery system on the contact resistance of the battery system.
First, an application scenario of the solution provided in the present application will be described below.
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 application scenario, the server 102 acquires test data of the battery system from the client 101, the server 102 determines the 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. For the specific implementation process of the server 102 determining the contact resistance of the battery system according to the test data of the battery system, reference may be made to the schemes of the following embodiments.
It should be noted that fig. 1 is only a schematic diagram of an application scenario provided in this embodiment, and this embodiment of the present application does not limit the devices included in fig. 1, and also does not 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 further included, and the data storage device may be an external memory with respect to the client 101 or the server 102, or may be an internal memory integrated in the client 101 or the server 102.
Next, a method of determining the contact resistance will be described by way of specific embodiments.
Fig. 2 is a flowchart of a method for determining contact resistance according to an embodiment of the present disclosure. The method of the embodiment of the present application may be applied to an electronic device, where the electronic device may be a client 101 or a server 102, or a server cluster, as shown in fig. 1. As shown in fig. 2, the method of the embodiment of the present application includes:
s201, obtaining test data of the battery system, wherein the test data comprises test data obtained by performing pulse charging and/or pulse discharging on the battery system.
In an embodiment of the present application, the battery system includes at least one of a battery module, a battery box, a battery pack, a battery unit, and an energy storage system, which is not limited in this application. 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 includes, for example, current, voltage, temperature, SOC, and SOH of the battery system, which the present application is not limited to.
The test data of the battery system may be input by a user to the electronic device executing the embodiment of the method, or may be transmitted by other devices to the electronic device executing the embodiment of the method. For example, the battery system is a battery system of an electric vehicle, and the electric vehicle uploads test data of the battery system to the cloud server, and the electronic device executing the embodiment of the method may directly obtain the test data of the battery system from the cloud server. It will be appreciated that when a pulse charge test or a pulse discharge test is performed on a battery system, the current, voltage and temperature used should be within the allowable test conditions for the batteries and electrical components within the battery system. For example, the maximum allowable current of an electrical component in a battery system is 500A, the current used in the pulse discharge test of the electrical component cannot be greater than 500A.
And 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 according to 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 repeated herein.
And S203, determining the contact resistance of the battery system according to the difference value of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system.
In this step, the electrical component in the battery system includes at least one of a wire harness, a board, a copper aluminum bar, and a bolt of the battery system, which is not limited in this application. The resistance of the single battery in the battery system and the resistance of the electrical component in the battery system may be obtained in various ways, and for how to obtain the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system, reference may be made to subsequent embodiments, which are not described herein again.
After obtaining the resistance of the battery system, the resistance of the single battery in the battery system, and the resistance of the electrical component in the battery system, the contact resistance of the battery system may be determined as 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, that is, the contact resistance of the battery system is obtained by subtracting the resistance of the single battery in the battery system from the resistance of the battery system and then subtracting the resistance of the electrical component in the battery system from the resistance of the battery system. It can be understood that if the battery system includes a plurality of cell resistors and a plurality of electrical components, for example, the battery system includes 100 cell resistors and 5 electrical components, the contact resistance of the battery system is obtained by subtracting the 100 cell resistors from the resistance value of the battery system and then subtracting the resistance of the 5 electrical components from the resistance value of 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 the sum thereof. For example, if the battery system is a battery pack, and the battery pack includes 10 battery modules, the total contact resistance of the 10 battery modules in the battery pack may be calculated, or the contact resistance of any two battery modules may 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 part 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 part 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 and analysis of the battery system.
Fig. 3 is a flowchart of a method for determining contact resistance according to another embodiment of the present application. On the basis of the above embodiments, the embodiments of the present application further explain 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, test data of the battery system are obtained, wherein the test data comprise test data obtained by carrying out pulse charging and/or pulse discharging on the battery system.
For a detailed description of this step, reference may be made to the description related to S201 in the embodiment shown in fig. 2, and details are not described here.
In this embodiment of the present application, the step S202 in fig. 2 may further include the following two steps S302 and S303:
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, and 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 may be obtained from the test data. If the test data is obtained by performing pulse discharge on the battery system, the first voltage before performing pulse discharge on the battery system, the second voltage after performing pulse discharge on the battery system, and the pulse current when performing pulse discharge on the battery system can be obtained from the test data.
And 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 quotient obtained by dividing the voltage difference between the first voltage and the second voltage 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: acquiring 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 acquiring the resistance of the single battery provided by the provider.
The battery system parameters include the corresponding single battery resistances under different test conditions, specifically, for example, the single battery resistances obtained under different voltage, current, temperature, SOC, and SOH test conditions, and may also be understood as the corresponding relationship between the single battery resistances and the different test conditions, and the corresponding relationship may be stored in a corresponding data table of the database. The battery system parameters may also include the manner in which the portions of the battery system are grouped, and thus the number of the cells included in the battery system may be determined.
In a 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.
For example, the voltage, the current, the temperature, the SOC and the SOH of the battery system during the test process may be obtained according to the test data, then the parameters of the battery system may be queried according to the obtained voltage, current, temperature, SOC and SOH, the correspondence between the obtained voltage, current, temperature, SOC and SOH and the resistance of the single battery may be determined, and then the resistance of the single battery in the battery system may be determined. If the battery system parameters are inquired 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 in an interpolation mode.
In another possible embodiment, the resistance of the single battery can be directly measured by a multimeter, a resistance meter and the like based on different test conditions.
In yet another possible embodiment, the resistance of the single battery provided by the provider may be obtained, where the provider is a supplier of the single battery, and it may be understood that the resistance of the single battery provided by the provider is the resistance of the single battery corresponding to different test conditions.
S305, determining the resistance of the electrical component in the battery system through at least one of the following modes: acquiring the resistance of an electrical part in the battery system according to the test data and the battery system parameters; measuring the resistance of an electrical component in the battery system; the resistance of an electrical component in a battery system provided by a provider is obtained.
The battery system parameter includes resistance of the electrical component corresponding to different test conditions, specifically, resistance of the electrical component obtained under different voltage, current, and temperature test conditions, and may also be understood as a corresponding relationship between the resistance of the electrical component and different test conditions, and the corresponding relationship may be stored in a corresponding data table of the database. All electrical components contained in the battery system can be determined according to the grouping mode of all parts of the battery system included in the battery system parameters. The test data includes at least one of a voltage, a current, a temperature, a SOC, and a SOH of the battery system during the test.
In a possible embodiment, after the test data of the battery system is obtained, the voltage, the current and the temperature of the battery system during 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 component in the battery system. If the battery system parameters are inquired 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 in an interpolation mode.
In another possible embodiment, the resistance of the electrical components in the battery system may be directly measured by a multimeter, a resistance meter, or the like based on different test conditions.
In yet another possible embodiment, the resistance of the electrical component in the battery system provided by the provider, that is, the provider of the electrical component, may be obtained, and it may be understood that the resistance of the electrical component in the battery system provided by the provider is the resistance of the corresponding electrical component under different test conditions.
On the basis of the above embodiment, the resistances of the electrical components included in the battery system can be obtained, and the sum of the resistances of the electrical components included in the battery system can be determined.
Optionally, the resistivity of the electrical component in the battery system is obtained according to the test data and the battery system parameters, the battery system parameters include the resistivity of the corresponding electrical component under different test conditions, and the test data include at least one of voltage, current, temperature, SOC, and SOH of the battery system in the test process; obtaining the size of an electrical component in the battery system; determining a product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system as a resistance of the electrical component within the battery system.
The battery system parameters include resistivity of the electrical component corresponding to different test conditions, specifically, for example, resistivity of the electrical component obtained under different voltage, current and temperature test conditions, and may also be understood as a corresponding relationship between the resistivity of the electrical component and the different test conditions, and the corresponding relationship may be stored in a corresponding data table of the database. 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 inquired according to the obtained voltage, current and temperature to obtain the resistivity of the electrical component in the battery system. If the battery system parameters are inquired according to the obtained voltage, current and temperature, and the resistivity of the corresponding electrical part is not found, the resistivity of the corresponding electrical part can be obtained in an interpolation mode. 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 obtaining the resistivity and the size of the electrical component within 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 may be determined to be the resistance of the electrical component within the battery system.
And S306, determining the contact resistance of the battery system according to the difference value of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system.
For a detailed description of this step, reference may be made to the related description of S203 in the embodiment shown in fig. 2, and details are not repeated here.
According to the method for determining the contact resistance, test data of the battery system are obtained, wherein the test data comprise test data obtained by carrying out pulse charging and/or pulse discharging on 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 a battery system: determining a resistance of an electrical component within the battery system; and determining the contact resistance of the battery system according to the difference value of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical components in the battery system. According to the embodiment of the application, the resistance of the electrical part 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 part 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 and analysis of the battery system.
On the basis of the above-described embodiment, it is exemplarily assumed that one battery unit includes 3 battery packs, each of which includes 240 unit batteries, and each of the battery packs may 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. The external characteristic data of the battery cells as 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 before discharge/V | 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 |
Based on table 1, taking the battery pack 1 as an example, from the total voltage of the battery pack 1 before pulse discharge 801.3V, the total voltage after pulse discharge 781.1V, and the pulse discharge current 170.18a, the resistance of the battery pack 1 can be obtained as: (801.3-781.1)/170.18m omega, namely 118.70m omega. By analogy, a resistance of 119.07m Ω for battery pack 2 and 118.92m Ω for battery pack 3 can be obtained.
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 further, SOC of the unit cells can be obtained. Fig. 4(a) is a schematic diagram of the SOC of a unit cell included in the battery pack 1 provided in an embodiment of the present application, fig. 4(b) is a schematic diagram of the SOC of a unit cell included in the battery pack 2 provided in an embodiment of the present application, and fig. 4(c) is a schematic diagram of the SOC of a unit cell included in the battery pack 3 provided in an embodiment of the present application. As shown in fig. 4(a) to 4(c), the abscissa indicates the numbers corresponding to the 240 unit cells included in each battery pack, the ordinate indicates the SOC corresponding to the 240 unit cells, respectively, and fig. 4(a) to 4(c) show the SOC 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 a single battery included in the battery pack 1 provided in an embodiment of the present application, fig. 5(b) is a schematic diagram of the resistance of a single battery included in the battery pack 2 provided in an embodiment of the present application, and fig. 5(c) is a schematic diagram of the resistance of a single battery included in the battery pack 3 provided in an embodiment of the present application. As shown in fig. 5(a) to 5(c), the abscissa indicates the numbers corresponding to the 240 unit cells included in each battery pack, the ordinate indicates the resistances corresponding to the 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 single battery contained in each battery pack, the sum of the resistances of the single batteries corresponding to the battery pack 1, the battery pack 2 and the battery pack 3 can be obtained as follows: 107.40m Ω, 108.66m Ω, 108.40m Ω.
In the battery unit, according to data provided by a supplier, rated total resistances of electrical components such as connecting pieces, copper aluminum bars, board cards and the like respectively contained in the battery pack 1, the battery pack 2 and the battery pack 3 can be obtained to be 9m Ω. The resistivity of the wiring harness adopted by each battery pack in the test environment is 0.0754m omega/m, and the lengths of the wiring harnesses of the battery pack 1, the battery pack 2 and the battery pack 3 are respectively as follows: 6.54m, 4.54m and 6.04 m. Taking the wiring harness included in the battery pack 1 as an example, the wiring harness resistance of the battery pack 1 can be obtained as follows: 0.0754 × 6.54m Ω, i.e. 0.49m Ω. By analogy, the harness resistances of the battery pack 2 and the battery pack 3 can be obtained as follows: 0.34m Ω, 0.46m Ω.
From the above data, taking the wiring 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) m.OMEGA.i.e. 1.81 m.OMEGA.. By analogy, the contact resistances of the battery pack 2 and the battery pack 3 can be obtained as follows: 1.07 m.OMEGA.1.06 m.OMEGA..
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made 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 obtaining module 601, a second obtaining module 602, and a determining 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 performing pulse charging and/or pulse discharging on the battery system.
And a second obtaining module 602, configured to obtain the resistance of the battery system according to the test data.
The 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 resistances of the single battery in the battery system and resistances of electrical components 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 is carried out on the battery system, and the second voltage is a voltage after pulse charging is carried out on the battery system, or the first voltage is a voltage before pulse discharging is carried out on the battery system, and the second voltage is a voltage after pulse discharging is carried out on 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 determining module 603 may be further configured to: 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 electrical components in the battery system, determining the resistance of the single battery by at least one of the following modes: acquiring the resistance of the single battery according to the test data and the battery system parameters, wherein 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 acquiring the resistance of the single battery provided by the provider.
Optionally, when the determining module 603 is configured to obtain the resistance of the single battery according to the test data and the battery system parameter, the determining module may specifically be configured to: 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 determining module 603 may be further configured to: 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 electrical components in the battery system, determining the resistance of the electrical components in the battery system by at least one of the following modes: acquiring the resistance of an electrical part in the battery system according to test data and battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electrical part 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 the resistance of an electrical component in the battery system; the resistance of an electrical component in a battery system provided by a 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 electrical component in the battery system, acquiring the resistivity of the 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; obtaining the size of an electrical component in the battery system; determining a product of the resistivity of the electrical component within the battery system and the size of the electrical component within the battery system as a resistance of the electrical component within the battery system.
The apparatus of this embodiment may be configured to implement the technical solution of any one of the above-mentioned method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application. Illustratively, the electronic device may be provided as a server or a computer. Referring to fig. 7, an electronic device 700 includes a processing component 701 that further includes one or more processors and memory resources, represented by memory 702, for storing instructions, such as applications, that are executable by the processing component 701. The application programs stored in memory 702 may include one or more modules that each correspond to a set of instructions. Furthermore, the processing component 701 is configured to execute instructions to perform any of the above-described method embodiments.
The electronic device 700 may also include a power 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 computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the scheme of the determination method of the contact resistance is realized.
The present application also provides a computer program product comprising a computer program which, when executed by a processor, implements an aspect of the method of determining contact resistance as above.
The computer-readable storage medium 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 or optical disk. Readable storage media can be any available media 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. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, 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 understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method of determining contact resistance, comprising:
acquiring test data of a 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 of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical component in the battery system.
2. The method for determining contact resistance according to claim 1, wherein the obtaining the resistance of the battery system according to the test data comprises:
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 is carried out on the battery system, and the second voltage is a voltage after pulse charging is carried out on the battery system, or the first voltage is a voltage before pulse discharging is carried out on the battery system, and the second voltage is a voltage after pulse discharging is carried out on 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 the contact resistance according to claim 1 or 2, wherein 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 electrical component in the battery system, the method further comprises:
determining the cell resistance 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 corresponding single battery resistances under different test conditions;
measuring to obtain the resistance of the single battery;
and acquiring the resistance of the single battery provided by a provider.
4. The method for determining the contact resistance according to claim 3, wherein the obtaining the cell resistance according to the test data and the battery system parameters comprises:
and inquiring parameters of the battery system according to the 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, state of charge (SOC) and state of health (SOH) of the battery system in the test process.
5. The method for determining the contact resistance according to claim 1 or 2, wherein 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 electrical component in the battery system, the method further comprises:
determining a resistance of an electrical component within the battery system by at least one of:
acquiring the resistance of an electrical part in the battery system according to the test data and battery system parameters, wherein the battery system parameters comprise the resistance of the corresponding electrical part under different test conditions, and the test data comprises at least one of the voltage, the current, the temperature, the SOC and the SOH of the battery system in the test process;
measuring the resistance of an electrical component in the battery system;
obtaining the resistance of an electrical component in the battery system provided by a provider.
6. The method for determining the contact resistance according to claim 1 or 2, wherein 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 electrical component in the battery system, the method further comprises:
acquiring the resistivity of an electrical part in the battery system according to the test data and battery system parameters, wherein the battery system parameters comprise the resistivity of the corresponding electrical part 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;
obtaining a size of an electrical component within the battery system;
determining a product of a resistivity of the 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.
7. A contact resistance determining apparatus, comprising:
the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring test data of a battery system, and the test data comprises test data obtained by carrying out pulse charging and/or pulse discharging on the battery system;
the second acquisition module is used for acquiring the resistance of the battery system according to the test data;
the determining module is used for determining the contact resistance of the battery system according to the difference value of the resistance of the battery system, the resistance of the single battery in the battery system and the resistance of the electrical parts in the battery system.
8. 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 by the memory to implement the method of determining contact resistance of any one of claims 1 to 6.
9. A computer-readable storage medium, in which computer program instructions are stored, which, when executed by a processor, implement the method of determining contact resistance of any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the method of determining the contact resistance according to any one of claims 1 to 6.
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