CN109507603B - Power battery external characteristic testing method and system - Google Patents
Power battery external characteristic testing method and system Download PDFInfo
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Abstract
The invention provides a method and a system for testing external characteristics of a power battery, wherein the system comprises the following steps: one end of the upper computer is connected with the power battery, the other end of the upper computer is connected with one end of the charging and discharging equipment, and the upper computer is used for reading a feedback value of the power battery in real time, converting the feedback value into a required value of the charging and discharging equipment, and sending the required value to the charging and discharging equipment. The other end of the charge and discharge equipment is connected with a three-phase power supply, the positive electrode of the charge and discharge equipment is respectively connected with the positive electrode of the power battery and the power analyzer, and the negative electrode of the charge and discharge equipment is connected with the negative electrode of the power battery and used for charging and discharging the power battery based on the required value. And the power analyzer is used for acquiring the charging and discharging current, voltage and power of the charging and discharging equipment until an external characteristic curve of the power battery is obtained. According to the scheme provided by the invention, the requirement value of the charging and discharging equipment is adjusted to perform the charging and discharging experiment on the power battery through the feedback value acquired in real time, so that the external characteristic curve of the power battery is obtained, and the accuracy of the charging and discharging test is improved.
Description
Technical Field
The invention relates to the technical field of testing, in particular to a method and a system for testing external characteristics of a power battery.
Background
With the development of scientific technology, automobiles have become one of the main transportation vehicles, such as electric automobiles. The energy source of the driving device and other auxiliary machines in the electric automobile is a power battery, so that the testing of the external characteristics of the power battery is the most important part of the production and the research and development of the electric automobile.
At present, a test method for a power battery mainly utilizes charge and discharge equipment to test an external characteristic curve of the power battery with constant charge and discharge current and power. However, the maximum charging and discharging current and power Of the power battery are different under different voltage and State Of Charge (SOC) values. Therefore, the external characteristic curve obtained by testing the power battery with constant charge and discharge current and power is not accurate.
Therefore, the existing technology for testing the external characteristics of the power battery has the problems of low testing accuracy and the like.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and a system for testing external characteristics of a power battery, so as to solve the problem of low testing accuracy in the existing technology for testing external characteristics of a power battery.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the first aspect of the embodiment of the invention discloses a power battery external characteristic testing system, which comprises: the system comprises an upper computer, charging and discharging equipment and a power analyzer;
one end of the upper computer is connected with a power battery, the other end of the upper computer is connected with one end of the charging and discharging equipment, and the upper computer is used for reading a feedback value of the power battery in real time, converting the feedback value into a required value of the charging and discharging equipment, and sending the required value to the charging and discharging equipment, wherein the feedback value comprises the maximum allowable charging and discharging current and power of the power battery;
the other end of the charge and discharge equipment is connected with a three-phase power supply, the positive electrode of the charge and discharge equipment is respectively connected with the positive electrode of the power battery and the power analyzer, and the negative electrode of the charge and discharge equipment is connected with the negative electrode of the power battery and used for charging and discharging the power battery based on the required value;
and the power analyzer is used for acquiring the charging and discharging current, voltage and power of the charging and discharging equipment until the external characteristic curve of the power battery is obtained.
Optionally, the upper computer is connected with the power battery and the charging and discharging device through a Controller Area Network (CAN) bus respectively.
Optionally, the charging and discharging device is connected to the power battery, the power analyzer and the three-phase power supply through charging and discharging high-voltage lines.
Optionally, the upper computer includes: the system comprises a processor and a dual-channel CAN communication card;
the processor is used for receiving the feedback value sent by the dual-channel CAN communication card, converting the feedback value into the required value and sending the required value to the dual-channel CAN communication card;
and one end of the dual-channel CAN communication card is connected with a power battery, and the other end of the dual-channel CAN communication card is connected with the charging and discharging equipment and is used for reading the feedback value of the power battery in real time, sending the feedback value to the processor, receiving the required value sent by the processor and sending the required value to the charging and discharging equipment.
Optionally, the system further includes:
and the memory is connected with the upper computer and used for storing the feedback value containing the maximum allowable charging and discharging current and power of the power battery read by the upper computer in real time.
The second aspect of the embodiment of the present invention discloses a method for testing external characteristics of a power battery, which is applicable to the system for testing external characteristics of a power battery disclosed in the first aspect of the embodiment of the present invention, and the method includes:
reading a feedback value of the power battery in real time by using an upper computer, converting the feedback value into a required value of charge and discharge equipment, and sending the required value to the charge and discharge equipment, wherein the feedback value comprises the maximum allowable charge and discharge current and power of the power battery;
charging and discharging the power battery by using the charging and discharging equipment based on the requirement value;
and collecting the charging and discharging current, voltage and power of the charging and discharging equipment by using a power analyzer until an external characteristic curve of the power battery is obtained.
Optionally, after the feedback value of the power battery is read in real time by using the upper computer, the method further comprises the following steps:
storing the feedback value containing the maximum allowable charging and discharging current and power of the power battery read by the upper computer in real time
Based on the method and the system for testing the external characteristics of the power battery provided by the embodiment of the invention, the system comprises: one end of the upper computer is connected with the power battery, the other end of the upper computer is connected with one end of the charging and discharging equipment, and the upper computer is used for reading a feedback value of the power battery in real time, converting the feedback value into a required value of the charging and discharging equipment, and sending the required value to the charging and discharging equipment. The other end of the charge and discharge equipment is connected with a three-phase power supply, the positive electrode of the charge and discharge equipment is respectively connected with the positive electrode of the power battery and the power analyzer, and the negative electrode of the charge and discharge equipment is connected with the negative electrode of the power battery and used for charging and discharging the power battery based on the required value. And the power analyzer is used for acquiring the charging and discharging current, voltage and power of the charging and discharging equipment until an external characteristic curve of the power battery is obtained. According to the scheme provided by the invention, the requirement value of the charging and discharging equipment is adjusted to perform the charging and discharging experiment on the power battery through the feedback value acquired in real time, so that the external characteristic curve of the power battery is obtained, and the accuracy of the charging and discharging test is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram of a system for testing external characteristics of a power battery according to an embodiment of the present invention;
fig. 2 is a block diagram of a system for testing external characteristics of a power battery according to an embodiment of the present invention;
fig. 3 is a block diagram of a system for testing external characteristics of a power battery according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for testing external characteristics of a power battery according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As known from the background art, the conventional testing method for the power battery mainly utilizes charging and discharging equipment to test the external characteristic curve of the power battery with constant charging and discharging current and power. However, the maximum charging and discharging current and power Of the power battery are different under different voltage and State Of Charge (SOC) values. Therefore, the external characteristic curve obtained by testing the power battery with constant charge and discharge current and power is not accurate.
Therefore, the embodiment of the invention provides a method and a system for testing external characteristics of a power battery, wherein the system comprises the following steps: host computer, charge-discharge equipment and power analyzer. One end of the upper computer is connected with the power battery, and the other end of the upper computer is connected with one end of the charge and discharge equipment. The other end of the charge and discharge equipment is connected with a three-phase power supply, the positive pole of the charge and discharge equipment is respectively connected with the positive pole of the power battery and the power analyzer, and the negative pole of the charge and discharge equipment is connected with the negative pole of the power battery. The upper computer is used for acquiring the feedback value of the power battery in real time, converting the feedback value into the required value of the charging and discharging equipment, and sending the required value to the charging and discharging equipment. And charging and discharging the power battery by using the charging and discharging equipment based on the demand value. And a power analyzer is used for collecting the charging and discharging current, voltage and power of the charging and discharging equipment until an external characteristic curve of the power battery is obtained, so that the accuracy of the charging and discharging test is improved.
Referring to fig. 1, a block diagram of a power battery external characteristic testing system according to an embodiment of the present invention is shown, where the system includes: the system comprises an upper computer 101, charging and discharging equipment 102, a power analyzer 103, a three-phase power supply 104 and a power battery 105.
One end of the upper computer 101 is connected with a power battery 105, and the other end of the upper computer is connected with one end of the charging and discharging equipment 102, and the upper computer is used for reading a feedback value of the power battery 105 in real time, converting the feedback value into a required value of the charging and discharging equipment 102, and sending the required value to the charging and discharging equipment 102, wherein the feedback value comprises the maximum allowable charging and discharging current and power of the power battery 105.
In a specific implementation, the feedback value includes a maximum allowable charge/discharge current and power of the power battery 105. The required value is used for instructing the charging and discharging device 102 to perform a charging and discharging experiment on the power battery 105. The required value and the feedback value have a certain correspondence, that is, the required value is determined by the upper computer 101 based on the collected feedback value.
It should be noted that the upper computer 101 reads the feedback value from a Battery Management System (BMS) of the power Battery 105 through a Controller Area Network (CAN) bus.
The other end of the charge and discharge device 102 is connected to a three-phase power supply 104, the positive electrodes of the charge and discharge device 102 are respectively connected to the positive electrode of the power battery 105 and the power analyzer 103, and the negative electrode of the charge and discharge device 102 is connected to the negative electrode of the power battery 105, and is configured to charge and discharge the power battery 105 based on the required value.
In the specific implementation process, the charging and discharging experiment is performed on the power battery 105 by using the charging and discharging equipment 102, the SOC of the power battery 105 is discharged from 100% to a preset SOC minimum value, and then the SOC is charged from the preset SOC minimum value to 100%.
The charging and discharging order of the power battery 105 may include not only first discharging and recharging, but also first charging the power battery 105 from the preset SOC minimum value to 100% and then discharging from 100% to the preset SOC minimum value.
The power analyzer 103 is configured to collect charging and discharging currents, voltages, and powers of the charging and discharging device 102 until an external characteristic curve of the power battery 105 is obtained.
In a specific implementation process, the power analyzer 103 measures the charging and discharging current by means of a current transformer, the power analyzer 103 directly measures the voltage, and the power is obtained by multiplying the current by the voltage.
The external characteristics of the power battery refer to the maximum charge/discharge power of the power battery under different voltages or SOCs.
Preferably, the upper computer 101 is connected with the power battery 105 and the charging and discharging device 102 through a CAN bus.
Preferably, the charging and discharging device 102 is connected to the power battery 105, the power analyzer 103 and the three-phase power supply 104 through charging and discharging high-voltage wires, respectively.
In the embodiment of the invention, the upper computer is used for acquiring the feedback value of the power battery in real time, converting the feedback value into the required value of the charging and discharging equipment and sending the required value to the charging and discharging equipment. And charging and discharging the power battery by using the charging and discharging equipment based on the requirement value. And acquiring the charging and discharging current, voltage and power of the charging and discharging equipment by using a power analyzer until the external characteristic curve of the power battery is obtained, so that the accuracy of the charging and discharging test is improved.
Referring to fig. 2, a structural block diagram of a power battery external characteristic testing system provided in an embodiment of the present invention is shown, where the upper computer 101 includes: a processor 1011 and a dual channel CAN communications card 1012.
And the processor 1011 is configured to receive the feedback value sent by the dual-channel CAN communication card 1012, convert the feedback value into the required value, and send the required value to the dual-channel CAN communication card 1012.
And the dual-channel CAN communication card 1012, one end of which is connected with the power battery 105 and the other end of which is connected with the charging and discharging equipment 102, is used for reading the feedback value of the power battery 105 in real time, sending the feedback value to the processor 1011, receiving the required value sent by the processor 1011 and sending the required value to the charging and discharging equipment 102.
In the embodiment of the invention, the upper computer is used for acquiring the feedback value of the power battery in real time, converting the feedback value into the required value of the charging and discharging equipment and sending the required value to the charging and discharging equipment. And charging and discharging the power battery by using the charging and discharging equipment based on the requirement value. And acquiring the charging and discharging current, voltage and power of the charging and discharging equipment by using a power analyzer until the external characteristic curve of the power battery is obtained, so that the accuracy of the charging and discharging test is improved.
Referring to fig. 3, a block diagram of a system for testing external characteristics of a power battery according to an embodiment of the present invention is shown, where the system further includes:
and the memory 106 is connected with the upper computer 101 and is used for storing the feedback value of the power battery 105, which contains the maximum allowable charging and discharging current and power, read by the upper computer 101 in real time.
In the embodiment of the invention, the upper computer is used for acquiring the feedback value of the power battery in real time, converting the feedback value into the required value of the charging and discharging equipment and sending the required value to the charging and discharging equipment. And charging and discharging the power battery by using the charging and discharging equipment based on the requirement value. And acquiring the charging and discharging current, voltage and power of the charging and discharging equipment by using a power analyzer until the external characteristic curve of the power battery is obtained, so that the accuracy of the charging and discharging test is improved.
Corresponding to the system for testing external characteristics of a power battery provided in the embodiment of the present invention as shown in fig. 1, referring to fig. 4, an embodiment of the present invention further provides a flowchart of a method for testing external characteristics of a power battery, where the method includes the following steps:
step S401: and reading the feedback value of the power battery in real time by using an upper computer, converting the feedback value into a required value of the charging and discharging equipment, and sending the required value to the charging and discharging equipment.
In the process of implementing step S401 specifically, the feedback value includes the maximum allowable charge and discharge current and power of the power battery. And the required value is used for indicating the charging and discharging equipment to perform charging and discharging experiments on the power battery.
It should be noted that the upper computer reads the feedback value from the BMS of the power battery through the CAN bus.
Preferably, after the feedback value of the power battery is read in real time by the upper computer, the feedback value including the maximum allowable charging and discharging current and power of the power battery, which is read in real time by the upper computer, is stored.
Step S402: and charging and discharging the power battery by using the charging and discharging equipment based on the requirement value.
In the process of specifically implementing the step S402, the power battery is subjected to a charge-discharge experiment by using the charge-discharge device, the SOC of the power battery is discharged from 100% to a preset SOC minimum value, and then the SOC is charged from the preset SOC minimum value to 100%.
It should be noted that, the order of charging and discharging the power battery not only includes discharging and recharging first, but also may be charging the power battery from the preset SOC minimum value to 100%, and then discharging from 100% to the preset SOC minimum value.
Step S403: and collecting the charging and discharging current, voltage and power of the charging and discharging equipment by using a power analyzer until an external characteristic curve of the power battery is obtained.
In the process of implementing step S403 specifically, the power analyzer measures the charging and discharging current by means of a current transformer, the power analyzer directly measures the voltage, and the power is obtained by multiplying the current by the voltage.
The external characteristics of the power battery refer to the maximum charge/discharge power of the power battery under different voltages or SOCs.
In summary, the present invention provides a method and a system for testing external characteristics of a power battery, wherein the system includes: one end of the upper computer is connected with the power battery, the other end of the upper computer is connected with one end of the charging and discharging equipment, and the upper computer is used for reading a feedback value of the power battery in real time, converting the feedback value into a required value of the charging and discharging equipment, and sending the required value to the charging and discharging equipment. The other end of the charge and discharge equipment is connected with a three-phase power supply, the positive electrode of the charge and discharge equipment is respectively connected with the positive electrode of the power battery and the power analyzer, and the negative electrode of the charge and discharge equipment is connected with the negative electrode of the power battery and used for charging and discharging the power battery based on the required value. And the power analyzer is used for acquiring the charging and discharging current, voltage and power of the charging and discharging equipment until an external characteristic curve of the power battery is obtained. According to the scheme provided by the invention, the requirement value of the charging and discharging equipment is adjusted to perform the charging and discharging experiment on the power battery through the feedback value acquired in real time, so that the external characteristic curve of the power battery is obtained, and the accuracy of the charging and discharging test is improved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A power battery external characteristic testing system, characterized in that, the system includes: the system comprises an upper computer, charging and discharging equipment and a power analyzer;
one end of the upper computer is connected with a power battery, the other end of the upper computer is connected with one end of the charging and discharging equipment, and the upper computer is used for reading a feedback value of the power battery in real time, converting the feedback value into a required value of the charging and discharging equipment based on a preset corresponding relation, and sending the required value to the charging and discharging equipment, wherein the feedback value comprises the maximum allowable charging and discharging current and power of the power battery, and the corresponding relation comprises the corresponding relation between the feedback value and the required value of the charging and discharging equipment;
the other end of the charge and discharge equipment is connected with a three-phase power supply, the positive electrode of the charge and discharge equipment is respectively connected with the positive electrode of the power battery and the power analyzer, and the negative electrode of the charge and discharge equipment is connected with the negative electrode of the power battery and used for charging and discharging the power battery based on the required value;
the power analyzer is used for acquiring the charging and discharging current, voltage and power of the charging and discharging equipment until an external characteristic curve of the power battery is obtained;
wherein, the host computer includes: the system comprises a processor and a dual-channel CAN communication card;
the processor is used for receiving the feedback value sent by the dual-channel CAN communication card, converting the feedback value into the required value and sending the required value to the dual-channel CAN communication card;
and one end of the dual-channel CAN communication card is connected with a power battery, and the other end of the dual-channel CAN communication card is connected with the charging and discharging equipment and is used for reading the feedback value of the power battery in real time, sending the feedback value to the processor, receiving the required value sent by the processor and sending the required value to the charging and discharging equipment.
2. The system of claim 1, wherein the upper computer is connected with the power battery and the charging and discharging device through a Controller Area Network (CAN) bus respectively.
3. The system of claim 1, wherein the charging and discharging equipment is connected with the power battery, the power analyzer and a three-phase power supply through charging and discharging high-voltage wires respectively.
4. The system of claim 1, further comprising:
and the memory is connected with the upper computer and used for storing the feedback value containing the maximum allowable charging and discharging current and power of the power battery read by the upper computer in real time.
5. A method for testing external characteristics of a power battery, which is applicable to the system for testing external characteristics of a power battery of any one of claims 1-4, and comprises the following steps:
reading a feedback value of a power battery in real time by using an upper computer, converting the feedback value into a required value of charge and discharge equipment based on a preset corresponding relation, and sending the required value to the charge and discharge equipment, wherein the feedback value comprises the maximum allowable charge and discharge current and power of the power battery, and the corresponding relation comprises the corresponding relation between the feedback value and the required value of the charge and discharge equipment;
charging and discharging the power battery by using the charging and discharging equipment based on the requirement value;
collecting the charging and discharging current, voltage and power of the charging and discharging equipment by using a power analyzer until an external characteristic curve of the power battery is obtained;
wherein, the host computer includes: the system comprises a processor and a dual-channel CAN communication card;
the processor is used for receiving the feedback value sent by the dual-channel CAN communication card, converting the feedback value into the required value and sending the required value to the dual-channel CAN communication card;
and one end of the dual-channel CAN communication card is connected with a power battery, and the other end of the dual-channel CAN communication card is connected with the charging and discharging equipment and is used for reading the feedback value of the power battery in real time, sending the feedback value to the processor, receiving the required value sent by the processor and sending the required value to the charging and discharging equipment.
6. The method according to claim 5, after the real-time reading of the feedback value of the power battery by the upper computer, further comprising:
and storing the feedback value containing the maximum allowable charging and discharging current and power of the power battery read by the upper computer in real time.
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| US7327121B2 (en) * | 2006-05-12 | 2008-02-05 | Goodti Industrial Co., Ltd. | Charger having output voltage regulating function |
| CN103675686B (en) * | 2012-09-21 | 2017-01-18 | 华北电力大学 | Electric vehicle power battery charging and discharging operating condition simulation system and method |
| CN103715722B (en) * | 2012-09-28 | 2018-04-27 | 深圳市瑞能实业股份有限公司 | A kind of power battery pack equalization maintenance system and method |
| CN103439599A (en) * | 2013-08-07 | 2013-12-11 | 扬州亚星客车股份有限公司 | Electric vehicle real-time measurement system |
| CN104134829B (en) * | 2014-08-01 | 2017-02-01 | 国家电网公司 | Storage battery energy storage system control method |
| CN104678309B (en) * | 2015-01-16 | 2017-07-18 | 清华大学 | A kind of method for the dynamic external characteristics for determining electrokinetic cell |
| CN106932730B (en) * | 2017-05-04 | 2023-08-15 | 哈尔滨理工大学 | Measuring device and measuring method for power characteristics of lithium power battery system |
| CN206440806U (en) * | 2017-06-05 | 2017-08-25 | 哈尔滨理工大学 | A kind of measurement apparatus of lithium battery power characteristic |
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