System for remotely detecting power battery charge and discharge attenuation degree and detection method thereof

Abstract

The application provides a system for remotely detecting the charge and discharge attenuation degree of a power battery and a detection method thereof, and comprises a client, a detection device and a data server. The detection device is arranged on a wire harness of the battery, and is connected with the data server and the client. The client controls the start and end of the battery detection. The detection device measures the current size and sends the data to the data server through a 4G, 5G or the like network. The data server calculates the data and saves the data into a database. The application can be operated through the client, and is convenient to use. The application can detect the discharge attenuation degree during the driving of a vehicle, and solves the problem that the discharge attenuation degree cannot be detected during driving.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of detecting the charge and discharge attenuation degree of power batteries, and particularly relates to a system for remotely detecting the charge and discharge attenuation degree of power batteries and a detection method thereof. BACKGROUND

[0002] With the gradual depletion of current oil resources, the prospects of fuel vehicles are worrying. At present, electric vehicles powered by power lithium batteries have gradually developed. Electric vehicles refer to vehicles that are powered by on-board power sources and driven by electric motors.

[0003] Power lithium batteries are generally the key energy sources of electric vehicles.

[0004] With the long-term use of power lithium batteries, their capacity gradually decreases, and the capacity attenuation of power lithium batteries is a problem that must be faced in the promotion and use of electric vehicles. The capacity attenuation of power batteries determines the usable value of power batteries. At present, if the capacity of power batteries is to be accurately determined, professional instruments are generally needed to detect the capacity of power batteries, and the process is relatively complicated. Moreover, when the capacity of power lithium batteries is detected, the electric vehicle cannot operate normally.

[0005] The current detection steps of the charge attenuation degree of the power battery of a new energy electric vehicle are as follows:

[0006] 1. Park the vehicle, and disconnect the power supply of the vehicle;

[0007] 2. Use an instrument to monitor;

[0008] 3. Charge the vehicle;

[0009] The current detection steps of the discharge attenuation degree of the power battery of a new energy electric vehicle are as follows:

[0010] 1. Park the vehicle, and disconnect the power supply of the vehicle;

[0011] 2. Use an instrument to monitor;

[0012] 3. Turn on the power supply of the vehicle and keep the vehicle stationary, and start the air conditioner and other power-consuming devices;

[0013] Defects and deficiencies of the prior art:

[0014] When detecting the discharge attenuation degree, the vehicle cannot move, resulting in a long detection time and an inability to test under actual working conditions.

[0015] The Chinese patent "CN 104678317 A" provides a method and device for detecting the capacity attenuation of a power lithium battery, relating to the technical field of electric vehicles. The method includes: obtaining the charge and discharge history data of the power lithium battery; generating a relationship curve between the capacity of the power lithium battery and time according to the charge and discharge history data; determining the capacity of the power lithium battery corresponding to each time sampling point according to the relationship curve; obtaining an initial capacity and a current capacity of the power lithium battery among the capacities corresponding to the time sampling points; and determining the capacity attenuation rate of the power lithium battery according to the initial capacity and the current capacity. The charge and discharge history data of the battery needs to be obtained, and the capacity attenuation rate of the lithium battery is determined for the power lithium battery corresponding to each time sampling point, not the overall attenuation rate of the power lithium battery.

[0016] The Chinese patent "CN112269135A" and a system and method for automatically testing the capacity attenuation of a battery under cyclic charge and discharge conditions. The system includes a computer, a direct current stabilized power supply, a direct current electronic load, a data acquisition instrument, and three sets of wires. The direct current stabilized power supply, the direct current electronic load, and the data acquisition instrument are all in communication connection with the computer and are controlled by it. When in use, the corresponding automatic test parameters are set in the software of the computer, and the test can be automatically performed. The work of cyclic charge and discharge of the fire battery and the recording of test data can be continuously and accurately completed. The direct current stabilized power supply, the direct current electronic load, and the data acquisition instrument collect data, and the software of the computer is used to test and calculate the capacity attenuation of the battery. However, the charge capacity and discharge capacity of the battery are not measured, resulting in inaccurate final test data.

[0017] The Chinese patent "CN110658476B" provides a method for determining the accelerated capacity attenuation of a lithium battery under random charge and discharge conditions. The method includes the following steps: 1) fitting the capacity degradation curve of the experimental battery with a double exponential model during continuous charge and discharge; 2) defining the starting point of the accelerated capacity attenuation; 3) linearly fitting the coordinate data of the starting point of the accelerated capacity attenuation of all experimental batteries to obtain a critical curve of the accelerated capacity attenuation; and 4) measuring and recording the voltage and current data of the battery during continuous charge and discharge in real time, drawing the critical curve of the capacity attenuation, and determining whether the lithium battery enters the accelerated attenuation stage according to whether the actual measured capacity attenuation curve of the battery passes through the critical curve. The present invention can be used for battery accelerated attenuation determination under random charge and discharge conditions, but cannot calculate the attenuation rate between the charge capacity and the discharge capacity. SUMMARY

[0018] The main purpose of the present application is to provide a system and method for remotely detecting the charge and discharge attenuation degree of a power battery, which solves the problem that the vehicle cannot move during the detection of the discharge attenuation degree, resulting in a long detection time and the inability to test under actual working conditions.

[0019] To solve the above technical problems, the technical solution adopted by the present application is: a remote detection system for power battery charge and discharge attenuation degree, comprising a client, a detection device and a data server, the detection device is arranged on the wire harness of the battery, the detection device is connected with the data server and the client, the client controls the start and end of battery detection, the detection device measures the current size and sends data to the data server through 4G, 5G and other networks, and the data server calculates data and saves it to the database.

[0020] In the preferred scheme, the detection device comprises a detection host, a fixed detection ring is arranged on one side of the detection host, a movable detection ring is hinged to the fixed detection ring, a detection through hole is formed between the movable detection ring and the fixed detection ring, the detection through hole is sleeved on the detection wire harness, and an output interface is arranged on the other side of the detection host and electrically connected with the network sending device.

[0021] In the preferred scheme, the client is a small program, an APP and a WEB application program.

[0022] In the preferred scheme, the movable detection ring and the fixed detection ring form an open-close type Hall current sensor.

[0023] The detection method comprises:

[0024] S1, the detection of the charge and discharge attenuation degree of the new energy electric vehicle power battery is started;

[0025] S2, the client inputs the vehicle, battery and data acquisition and sending module information;

[0026] S3, the detection device and the battery wire harness are fixed;

[0027] S4, the client controls the start of the battery attenuation degree detection, selects the detection mode as charging or discharging, selects charging to enter S6, and selects discharging to enter S5;

[0028] S5, the vehicle is started and driven;

[0029] S6, the detection device collects the current at regular intervals and sends the data to the data server;

[0030] S7, the detection device collects the current at a collection period of P seconds and sends the data to the data server;

[0031] S8, the end capacity of the vehicle power battery at the end is input by the client at the end of the measurement;

[0032] S9, the data server calculates the cumulative charge and discharge capacity and the attenuation degree of the battery;

[0033] In the preferred solution, when the person in charge of detection starts detection using the client in S4, the client will send a detection start signal to the data server, and the data server will mark the current time as the detection start time after receiving the detection start signal;

[0034] The data server calculates the real-time charging and discharging capacity C1 in S7, and uses the algorithm C1 = I * (S / 3600) to obtain the current I and time S;

[0035] The algorithm for calculating the cumulative charging and discharging capacity of the battery and the attenuation degree in S9 is:

[0036] The cumulative charging and discharging capacity C2 of the battery is equal to the real-time charging and discharging capacity calculated in S7, where n is the number of times the device sends real-time data;

[0037]

[0038] The battery attenuation degree calculation formula is: battery attenuation degree P = cumulative charging and discharging capacity C2 / (| charging and discharging detection end capacity C3 - charging and discharging detection start capacity C4 |) * 100%;

[0039] The calculation formula is:

[0040]

[0041] In the preferred solution, the charging and discharging detection start capacity is input by the client in S2;

[0042] The charging and discharging detection end capacity is input by the client in S9.

[0043] The present application provides a remote detection of power battery charging and discharging attenuation system and its detection method, the present application can obtain battery charging and discharging information through the client, and is convenient to use; the present application can be operated through the client, and is convenient to use; the present application can detect the discharging attenuation degree during vehicle driving, and solves the problem that the discharging attenuation degree cannot be detected during driving. BRIEF DESCRIPTION OF DRAWINGS

[0044] The present application will be further described below in conjunction with the drawings and examples:

[0045] Fig. 1 is the structure diagram of the present application for remotely detecting the charging and discharging attenuation degree of the power battery;

[0046] Fig. 2 is the flow chart of the method for remotely detecting the charging and discharging attenuation degree of the power battery of the present application;

[0047] Fig. 3 is the structure diagram of the detection device of the present application.

[0048] In the diagram: 1. Active detection ring; 2. Fixed detection ring; 3. Detection host; 4. Output interface. Detailed Implementation

[0049] Example 1

[0050] like Figs. 1-3 As shown, a remote detection system for the charge / discharge degradation of a power battery includes a client, a detection device, and a data server. The detection device is mounted on the battery's wiring harness and is connected to both the data server and the client. The client controls the start and end of the battery detection. The detection device measures the current and transmits it to the data server via a 4G, 5G, or other network. The data server calculates the data and saves it to a database. The detection device includes a detection host 3. A fixed detection ring 2 is located on one side of the detection host 3, and a movable detection ring 1 is hinged to the fixed detection ring 2. A detection through-hole is formed between the movable detection ring 1 and the fixed detection ring 2, and the detection through-hole is fitted onto the detection wiring harness. An output interface 4 is located on the other side of the detection host 3 and is electrically connected to a network transmitting device. Preferably, the client is a mini-program, APP, or WEB application. The movable detection ring 1 and the fixed detection ring 2 form an openable Hall current sensor. The client controls the start and end of the battery detection. The detection device measures the current and transmits it to the data server via a 4G, 5G, or other network. The data server calculates the data and saves it to a database. The client application can be a mini-program, APP, or WEB application. Testing personnel use the client to input battery information and data acquisition and transmission module information, control the start and end of charge / discharge testing, and view battery charge / discharge data. The testing device is an IoT module that measures current and transmits the current data to a server. The data server is used to calculate battery charge / discharge capacity, degradation rate, and store data.

[0051] Example 2

[0052] Further explanation in conjunction with Example 1, such as Figs. 1-3 As shown:

[0053] S1. Testing of the charge / discharge degradation of the power battery of new energy electric vehicles begins.

[0054] S2. The client inputs information about the vehicle, battery, and data acquisition and transmission module;

[0055] S3. Secure the testing equipment and battery wiring harness;

[0056] S4. The client controls the start of battery degradation detection. Select the detection method as charging or discharging. If charging is selected, proceed to S6; if discharging is selected, proceed to S5.

[0057] S5, the vehicle starts running;

[0058] S6, the detection device collects current and sends data to the data server;

[0059] S7, the detection device collects current and sends data to the data server with a collection period of P seconds;

[0060] S8, the end capacity of the vehicle power battery at the end of the measurement is entered by the client at the end of the measurement;

[0061] S9, the data server calculates the cumulative charge and discharge capacity of the battery and the attenuation degree.

[0062] In S4, the detection personnel use the client to start the detection, and the client transmits a detection start signal to the data server. The data server receives the detection start signal and marks the current time as the detection start time;

[0063] In S7, the data server calculates the real-time charge and discharge battery capacity C1 using the algorithm: C1 = I * (S / 3600) by using the obtained current I and time S.

[0064] In S9, the data server calculates the cumulative charge and discharge capacity of the battery and the attenuation degree algorithm:

[0065] The cumulative charge and discharge capacity C2 of the battery is equal to the real-time charge and discharge capacity calculated in S7, where n is the number of times the device sends real-time data.

[0066]

[0067] The battery attenuation degree calculation formula is: battery attenuation degree P = cumulative charge and discharge capacity C2 of the battery / (| charge and discharge detection end capacity C3 - charge and discharge detection start capacity C4 |) * 100%.

[0068] The calculation formula is:

[0069]

[0070] The charge and discharge detection start capacity is input by the S2 client;

[0071] The charge and discharge detection end capacity is input by the S9 client.

[0072] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as a limitation of the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, including equivalent replacement solutions of the technical features claimed in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A detection method for a remote detection system for the charge / discharge degradation of a power battery, characterized in that: The system includes a client, a detection device, and a data server. The detection device is installed on the battery wiring harness and is connected to both the data server and the client. The client controls the start and end of the battery detection. The detection device measures the current and transmits it to the data server via 4G or 5G networks. The data server calculates the data and saves it to a database. The testing equipment includes a testing host (3), a fixed testing ring (2) is provided on one side of the testing host (3), a movable testing ring (1) is hinged on the fixed testing ring (2), a testing through hole is formed between the movable testing ring (1) and the fixed testing ring (2), the testing through hole is fitted on the testing wire harness, and an output interface (4) is provided on the other side of the testing host (3), the output interface (4) is electrically connected to the network sending device; The detection methods include: S1. Testing of the charge / discharge degradation of the power battery of new energy electric vehicles begins. S2. The client inputs information about the vehicle, battery, and data acquisition and transmission module; S3. Secure the testing equipment and battery wiring harness; S4. The client controls the start of battery degradation detection. Select the detection method as charging or discharging. If charging is selected, proceed to S6; if discharging is selected, proceed to S5. S5. The vehicle starts moving; S6. The detection equipment collects the current at a collection cycle of P1 seconds and sends the data to the data server; S7: The data server calculates the real-time charging and discharging capacity. S8. When the measurement is completed, use the client to enter the final capacity of the vehicle's power battery. S9, the data server calculates the battery's cumulative charge and discharge capacity and degradation rate; The algorithm used by the data server in S9 to calculate the cumulative charge / discharge capacity and degradation rate of the battery is as follows: The cumulative charge and discharge capacity of the battery, C2, is equal to the sum of the real-time charge and discharge capacity calculated in S7, where n is the number of times the device sends real-time data; Battery degradation calculation formula: Battery degradation P2 = Cumulative charge / discharge capacity C2 / (|Capacity at the end of charge / discharge test C3 - Capacity at the beginning of charge / discharge test C4|) * 100%; The calculation formula is: When an inspector starts an inspection using the client in S4, the client will send an inspection start signal to the data server. Upon receiving the inspection start signal, the data server will mark the current time as the inspection start time. In S7, the data server calculates the real-time charging and discharging battery capacity C1 in real time, and uses the obtained current I and time P3 with the algorithm: C1=I*(P3 / 3600).

2. The detection method for a remote detection system for the charge / discharge degradation of a power battery according to claim 1, characterized in that: The client can be a mini-program, an app, or a web application.

3. The detection method for a remote detection system for the charge / discharge degradation of a power battery according to claim 1, characterized in that: The active detection ring (1) and the fixed detection ring (2) form an open-close Hall current sensor.

4. The detection method for a remote detection system for the charge / discharge degradation of a power battery according to claim 1, characterized in that: The charge / discharge detection start capacity is input via the S2 client; The charge / discharge test completion capacity is input via the S9 client.

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