A method for quickly detecting battery self-discharge

Abstract

The invention discloses a method for quickly detecting battery self-discharge, and the specific steps include: S1. charging a battery to be detected, ensuring that the temperature of the battery is stable, without any external connection, and reading the voltage of the battery to be detected; S2. using a suitable current sensor and a voltage sensor to measure the discharge process of the battery in real time, and feeding back the voltage value read in step S1 to a high-precision and stable power supply; S3. calculating the self-discharge rate of the battery, and keeping the connection state for several minutes; S4. calculating the power of the battery to be detected according to the measurement result, evaluating the discharge performance and self-discharge characteristics of the battery, comparing the measurement results of different batteries, and evaluating their lifespan and performance differences; S5. evaluating the quality of the measured battery according to the power calculated in step S1. The invention can quickly detect the battery and detect faults, thereby effectively extending the service life of the battery, which is convenient and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of battery detection, and in particular relates to a method for quickly detecting battery self-discharge. Background Art

[0002] New energy batteries do not produce harmful substances such as carbon dioxide and sulfide during use, and have minimal pollution to the environment, which is in line with the current global trend of promoting green, low-carbon and sustainable development. New energy batteries have high energy density and charging and discharging efficiency, which greatly improves the range of electric vehicles and other equipment. With the advancement of technology, the charging speed is also constantly increasing, providing a more convenient user experience. There are many types of new energy batteries, including lithium iron phosphate, ternary lithium, lithium manganese oxide, lithium titanate, lithium cobalt oxide, sodium ion batteries, etc. Self-discharge is an inherent characteristic of all batteries, and how to quickly detect the self-discharge level of the battery is a hot technology that the industry pays common attention to.

[0003] Disadvantages of traditional new energy battery self-discharge detection: The inconsistency of self-discharge is an important factor affecting the overall performance of the battery pack. After a period of storage, the state of the battery with inconsistent self-discharge will be greatly different, which will affect the capacity and safety of the battery, making it impossible to quickly determine the value of the subject matter; it is impossible to quickly find the fault point of the entire battery pack; and it reduces the operating efficiency of the battery cell production company. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to solve the deficiencies in the prior art and provide a method for quickly detecting battery self-discharge.

[0005] A method for quickly detecting battery self-discharge includes a high-precision stable power supply, a current sensor and a voltage sensor. The high-precision stable power supply provides a high-precision and stable power supply signal. The current sensor monitors current changes in real time. The voltage sensor monitors voltage fluctuations in real time. The specific steps include: S1. Charge the battery to be tested, place the fully charged battery under constant environmental conditions, ensure that the battery temperature is stable, and without any external connections, and read the voltage of the battery to be tested; S2. Use appropriate current sensors and voltage sensors to measure the discharge process of the battery in real time, select different measurement intervals and time lengths, and feed back the voltage value read in step S1 to a high-precision and stable power supply so that an equal voltage is formed at the output end of the power supply and connected in parallel with the measured battery; S3. Process the measured current and voltage data, calculate the self-discharge rate of the battery, keep the connection state for several minutes, and then read the loop current to get close to the true value; S4. Calculate the power of the battery to be tested based on the measurement results, evaluate the discharge performance and self-discharge characteristics of the battery, compare the measurement results of different batteries, and evaluate their lifespan and performance differences; S5. Evaluate the quality of the measured battery according to the power calculated in step S1.

[0006] A further improvement of the present invention is that in step S1, the voltage of the battery to be tested has a value accuracy of 1×10- 5 V.

[0007] A further improvement of the present invention is that in step S3, the duration of maintaining the connection state is 5 minutes.

[0008] A further improvement of the present invention is that in step S3, a mathematical model is used to analyze the data of the self-discharge rate and obtain a result.

[0009] A further improvement of the present invention is that in step S3, a statistical method is used to analyze the data of the self-discharge rate and obtain a result.

[0010] A further improvement of the present invention is that in step S2, the current sensor includes a fiber optic current sensor, a current measuring coil and a signal conditioner.

[0011] A further improvement of the present invention is that in step S2, the voltage sensor includes a phase sequence voltage sensor and a zero sequence voltage sensor.

[0012] A further improvement of the present invention is that the high-precision and stable power supply includes a rectifier circuit, a filter capacitor and a step-down constant current circuit.

[0013] Compared with the prior art, the method for quickly detecting battery self-discharge provided by the present invention achieves at least the following beneficial effects: The present invention can process the measured current and voltage data, thereby calculating the self-discharge rate of the battery, and can quickly detect the self-discharge power, thereby improving the operating efficiency of the battery cell production enterprise; in the cascade utilization market, the value of the subject matter can be quickly determined; at the maintenance end, the fault point of the entire battery group can be quickly found. If the self-discharge rate of the battery is abnormally high, it indicates that the battery is faulty or damaged. By analyzing the measurement data, the battery fault can be detected, and corresponding measures can be taken to repair it. The present invention can quickly detect the discharge performance and self-discharge characteristics of the battery, provide an important reference basis for the design and use of the battery, and effectively extend the service life of the battery by regularly detecting and replenishing the charge. DETAILED DESCRIPTION

[0014] Various exemplary embodiments of the present invention are now described in detail. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. The following description of at least one exemplary embodiment is actually only illustrative and is not intended to be any limitation on the present invention and its application or use.

[0015] The techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered as part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0016] A method for quickly detecting battery self-discharge includes a high-precision stable power supply, a current sensor and a voltage sensor. The high-precision stable power supply provides a high-precision and stable power supply signal. The current sensor monitors current changes in real time. The voltage sensor monitors voltage fluctuations in real time. The specific steps include: S1. Charge the battery to be tested, place the fully charged battery under constant environmental conditions, ensure that the battery temperature is stable, and without any external connections, and read the voltage of the battery to be tested; S2. Use appropriate current sensors and voltage sensors to measure the discharge process of the battery in real time, select different measurement intervals and time lengths, and feed back the voltage value read in step S1 to a high-precision and stable power supply so that an equal voltage is formed at the output end of the power supply and connected in parallel with the measured battery; S3. Process the measured current and voltage data, calculate the self-discharge rate of the battery, keep the connection state for several minutes, and then read the loop current to get close to the true value; S4. Calculate the power of the battery to be tested based on the measurement results, evaluate the discharge performance and self-discharge characteristics of the battery, compare the measurement results of different batteries, and evaluate their lifespan and performance differences; S5. Evaluate the quality of the measured battery according to the power calculated in step S1.

[0017] A further improvement of the present invention is that in step S1, the voltage of the battery to be tested has a value accuracy of 1×10- 5 V, can provide a voltage output very close to the actual value, reducing the error in detection and thus improving measurement accuracy.

[0018] A further improvement of the present invention is that in step S3, the duration of maintaining the connection state is 5 minutes.

[0019] A further improvement of the present invention is that in step S3, a mathematical model is used to analyze the self-discharge rate data and obtain a result. The mathematical model uses mathematical symbols, images and formulas to reveal the properties, laws and structure of the battery, saving analysis time and cost.

[0020] A further improvement of the present invention is that in step S3, a statistical method is used to analyze the data of the self-discharge rate and obtain the result, thereby improving the ability of the test personnel to understand the data.

[0021] A further improvement of the present invention is that in step S2, the current sensor includes a fiber optic current sensor, a current measuring coil and a signal conditioner. The fiber optic current sensor has a wide dynamic range and good linearity, can handle a wide range of current changes, and has a stable output signal. The signal conditioner can convert signals from different sensors into digital signals, thereby improving performance.

[0022] A further improvement of the present invention is that in step S2, the voltage sensor includes a phase sequence voltage sensor and a zero sequence voltage sensor. The phase sequence voltage sensor can detect whether the phase sequence of the voltage is correct, thereby ensuring the normal operation of the power system; the zero sequence voltage sensor has the advantages of high precision and fast response.

[0023] A further improvement of the present invention is that the high-precision and stable power supply includes a rectifier circuit, a filter capacitor and a step-down constant current circuit. The voltage output by the rectifier circuit is stable; the filter capacitor has the advantages of small size, light weight and easy carrying; the step-down constant current circuit can still provide a stable power supply when the load changes, thereby improving the stability of the output current.

[0024] In summary, the method for quickly detecting battery self-discharge provided by the present invention can process the measured current and voltage data, and thus calculate the self-discharge rate of the battery, and can quickly detect the self-discharge power, thereby improving the operating efficiency of the battery cell production enterprise; in the cascade utilization market, the value of the subject matter can be quickly determined; at the maintenance end, the fault point of the entire battery group can be quickly found. If the self-discharge rate of the battery is abnormally high, it indicates that the battery is faulty or damaged. By analyzing the measurement data, the battery fault can be detected, and corresponding measures can be taken to repair it. The present invention can effectively evaluate the discharge performance and self-discharge characteristics of the battery, provide an important reference basis for the design and use of the battery, and effectively extend the service life of the battery by regularly detecting and replenishing the charge, which is convenient and reliable.

[0025] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A method for quickly detecting battery self-discharge, characterized in that: It includes a high-precision and stable power supply, a current sensor and a voltage sensor. The high-precision and stable power supply provides a high-precision and stable power supply signal. The current sensor monitors the current change in real time, and the voltage sensor monitors the voltage fluctuation in real time. The specific steps include: S1. Charge the battery to be tested, place the fully charged battery under constant environmental conditions, ensure that the battery temperature is stable, and without any external connections, and read the voltage of the battery to be tested; S2. Use appropriate current sensors and voltage sensors to measure the discharge process of the battery in real time, select different measurement intervals and time lengths, and feed back the voltage value read in step S1 to a high-precision and stable power supply so that an equal voltage is formed at the output end of the power supply and connected in parallel with the measured battery; S3. Process the measured current and voltage data, calculate the self-discharge rate of the battery, keep the connection state for several minutes, and then read the loop current to get close to the true value; S4. Calculate the power of the battery to be tested based on the measurement results, evaluate the discharge performance and self-discharge characteristics of the battery, compare the measurement results of different batteries, and evaluate their lifespan and performance differences; S5. Evaluate the quality of the measured battery according to the power calculated in step S1.

2. A method for quickly detecting battery self-discharge according to claim 1, characterized in that: In step S1, the voltage of the battery to be tested has a value accuracy of 1×10 -5 V.

3. A method for quickly detecting battery self-discharge according to claim 1, characterized in that: In step S3, the duration of maintaining the connection state is 5 minutes.

4. A method for quickly detecting battery self-discharge according to claim 1, characterized in that: In step S3, a mathematical model is used to analyze the data of the self-discharge rate and obtain a result.

5. A method for quickly detecting battery self-discharge according to claim 1, characterized in that: In step S3, a statistical method is used to analyze the self-discharge rate data and obtain a result.

6. A method for quickly detecting battery self-discharge according to claim 1, characterized in that: In the step S2, the current sensor includes a fiber optic current sensor, a current measuring coil and a signal conditioner.

7. A method for rapidly detecting battery self-discharge according to claim 1, characterized in that: In step S2, the voltage sensor includes a phase sequence voltage sensor and a zero sequence voltage sensor.

8. A method for quickly detecting battery self-discharge according to any one of claims 1 to 7, characterized in that: The high-precision and stable power supply comprises a rectifier circuit, a filter capacitor and a step-down constant current circuit.