CN110308399A - An accelerated life detection method suitable for lead-acid batteries of communication power supplies used in substations - Google Patents

Abstract

The invention relates to an accelerated life detection method applicable to lead-acid storage batteries for communication power supplies used in substations. Firstly, a storage battery is randomly selected and discharged after being fully charged. Discharge after charging, calculate the measured capacity of the battery according to the recorded data, calculate the actual capacity of the battery according to the formula, compare the relationship between the actual capacity and the measured capacity, and judge whether the battery is qualified. The invention adopts the high-temperature and high-current cycle charge-discharge working mode in the grid-connected life detection of the fixed valve-controlled lead-acid battery used in the communication power supply of the substation, which can rapidly age the battery life, greatly improve the detection speed, and can judge within 5 to 20 days Whether the battery life is qualified, the method is simple and easy to operate.

Description

An accelerated life test for lead-acid batteries for communication power supplies in substations method

technical field

The invention belongs to the technical field of lead-acid storage battery detection, and in particular relates to an accelerated life detection method suitable for lead-acid storage batteries of communication power supplies used in substations.

Background technique

With the development of the power industry and the construction of substations, the use of fixed valve-regulated lead-acid batteries in communication DC power supplies for substations is increasing. The tests on the performance of lead-acid batteries mainly include the initial capacity of the battery, charge retention capacity, sealing reaction efficiency, explosion-proof performance, safety valve action, air tightness, high-current discharge characteristics, overcharge capacity, cycle life, etc. Cycle life is a very important indicator of lead-acid batteries. In conventional life testing methods, a charge-discharge cycle takes about 24-48 hours, and life testing takes 6-12 months or even longer, which seriously affects lead-acid batteries. The verification cycle affects the network acceptance and equipment selection of equipment. Therefore, how to quickly and effectively verify the cycle life of lead-acid batteries and shorten the cycle life verification cycle of lead-acid batteries has become the need of the power industry.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide an accelerated life detection method suitable for lead-acid batteries of communication power supplies used in substations with simple operation and short detection period.

The concrete technical scheme that the present invention adopts is as follows:

An accelerated life detection method applicable to lead-acid batteries for communication power supplies used in substations, characterized in that it includes the following steps:

⑴Take out a battery and let it stand after fully charged;

(2) When the surface temperature of the battery is at room temperature, discharge the battery, and calculate the actual capacity of the battery according to the measured capacity of the battery after the discharge is completed;

(3) The battery is fully charged again;

(4) Put the battery in step (3) into an environment of 50-70 degrees Celsius, start discharging, and start charging when the battery is discharged to a low voltage until the battery is fully charged;

A discharge process and a charge process constitute a cycle, and 10 to 20 cycles are performed;

(5) After the battery treated in step (4) is placed in a room temperature environment, the battery is fully charged again;

⑹Stay the battery treated in step ⑸. When the surface of the battery is at room temperature, discharge it. After the discharge is completed, calculate the actual capacity of the battery according to the measured capacity of the battery;

⑺When the actual capacity is greater than 0.8 times of C10, the battery is qualified; otherwise, the battery is unqualified.

Furthermore, in step (1), place the extracted storage battery in an environment of 25°C±2°C, and charge it at a constant voltage of 2.4V/cell with a current limit of I ₁₀ A until the current value is stable within 5 hours. The storage battery is fully charged, and it is left to stand for 1 to 24 hours after being fully charged.

Furthermore, in step (2), when the surface temperature of the battery is 25°C ± 5°C, discharge the battery, discharge with a current of 1 ₁₀ A until the average voltage of the single battery is 1.80V, and terminate;

Record the initial battery surface temperature t and discharge duration T at the beginning of discharge, and calculate the measured capacity Ct of the battery by multiplying the discharge current value I by the discharge duration T;

Calculate the actual capacity Ca of the battery according to the formula

In addition, the full charge of step ⑶ is: put the battery in step ⑵ in an environment of 25°C±2°C, charge it with a constant voltage of 2.4V/cell and current limit I _10A until the current value is stable within 5 hours When the time changes, the battery is considered to be fully charged.

Have again, the ambient temperature of the discharging process of step (4) and the charging process are 60 ± 1 degree Celsius, carry out 15 cycles;

The discharge process is:

Discharge with a constant discharge current to 1.75/cell, and the discharge is complete;

The charging process is:

Charging is performed with constant charging current and constant charging voltage.

also,

When the battery capacity is 100 amps, the constant discharge current is 30 amps, the constant charge current is 25 amps, and the constant charge voltage is 2.4 volts;

When the battery capacity is 200 amps, the constant discharge current is 60 amps, the constant charge current is 50 amps, and the constant charge voltage is 2.4 volts;

When the battery capacity is 300 amps, the constant discharge current is 90 amps, the constant charge current is 75 amps, and the constant charge voltage is 2.4 volts;

When the battery capacity is 400A, the constant discharge current is 100A, the constant charge current is 100A, and the constant charge voltage is 2.4V.

In addition, during the charging process or discharging process, the surface temperature and appearance of the battery should be checked from time to time. If the temperature of the battery reaches 70 degrees Celsius or the appearance changes significantly, the test should be stopped immediately.

Furthermore, in step (5), the battery is placed in an environment of 25°C±2°C for 24 hours, and then charged at a constant voltage of 2.4V/cell with a current limit of I ₁₀ A until the current value is stable within 5 hours , the battery is considered fully charged.

Furthermore, when the surface temperature of the battery is 25°C±5°C, discharge with a current of I ₁₀ A until the average voltage of the single battery is 1.80V;

Record the initial battery surface temperature t and discharge duration T at the beginning of discharge, and calculate the measured capacity Ct of the battery by multiplying the discharge current value I by the discharge duration T;

Calculate the actual capacity Ca of the battery according to the formula

Advantage and beneficial effect of the present invention are:

In the present invention, first randomly extract a storage battery, discharge it after it is fully charged, then enter a discharge-charge cycle after it is fully charged again, discharge after the cycle is completed, and calculate the measured capacity of the storage battery according to the recorded data, Calculate the actual capacity of the battery according to the formula, compare the relationship between the actual capacity and the measured capacity, and judge whether the battery is qualified. The invention adopts the high-temperature and high-current cycle charge-discharge working mode in the grid-connected life detection of the fixed valve-controlled lead-acid battery used in the communication power supply of the substation, which can rapidly age the battery life, greatly improve the detection speed, and can judge within 5 to 20 days Whether the battery life is qualified, the method is simple and easy to operate.

Detailed ways

The present invention is further described in detail through the following examples, but the technical content described in this example is illustrative rather than limiting, and should not limit the protection scope of the present invention accordingly.

An accelerated life detection method applicable to lead-acid batteries for communication power supplies used in substations, the innovation of the present invention lies in: comprising the following steps:

⑴Take out a battery and let it stand after fully charged;

(2) When the surface temperature of the battery is at room temperature, discharge the battery, and calculate the actual capacity of the battery according to the measured capacity of the battery after the discharge is completed;

(3) The battery is fully charged again;

(4) Put the battery in step (3) into an environment of 50-70 degrees Celsius, start discharging, and start charging when the battery is discharged to a low voltage until the battery is fully charged;

A discharge process and a charge process constitute a cycle, and 10 to 20 cycles are performed;

(5) After the battery treated in step (4) is placed in a room temperature environment, the battery is fully charged again;

⑹Stay the battery treated in step ⑸. When the surface of the battery is at room temperature, discharge it. After the discharge is completed, calculate the actual capacity of the battery according to the measured capacity of the battery;

⑺When the actual capacity is greater than 0.8 times of C10, the battery is qualified; otherwise, the battery is unqualified.

Among them, in step (1), the extracted battery is placed in an environment of 25°C±2°C, charged at a constant voltage of 2.4V/cell with a current limit of I ₁₀ A until the current value is stable within 5 hours, the battery is considered to be It is fully charged, and it is left to stand for 1 to 24 hours after being fully charged.

In step (2), when the surface temperature of the battery is 25°C±5°C, discharge the battery, and discharge with a current of I ₁₀ A until the average voltage of the single battery is 1.80V. Record the initial temperature t of the battery surface and the discharge duration T at the beginning of the discharge, and multiply the discharge current value I by the discharge duration T to calculate the measured capacity Ct of the battery. Calculate the actual capacity Ca of the battery according to the formula:

The full charge of step ⑶ is: put the battery in step ⑵ in an environment of 25°C±2°C, charge it with a constant voltage of 2.4V/cell and current limit I ₁₀ A until the current value is stable within 5 hours, The battery is considered to be fully charged.

The ambient temperature of the discharge process and the charge process of step (4) is 60 ± 1 degrees Celsius, and the cycle is carried out 15 times;

The discharge process is: discharge to 1.75/unit with a constant discharge current, and the discharge is completed.

The charging process is: charging with a constant charging current and a constant charging voltage.

The definitions of the above constant discharge current, constant charge current and constant charge voltage are (see Table 1):

When the battery capacity is 100 amps, the constant discharge current is 30 amps, the constant charge current is 25 amps, and the constant charge voltage is 2.4 volts; when the battery capacity is 200 amps, the constant discharge current is 60 amps. ampere, the constant charge current is 50 amps, and the constant charge voltage is 2.4 volts; when the battery capacity is 300 amps, the constant discharge current is 90 amps, the constant charge current is 75 amps, and the constant charge The voltage is 2.4 volts; when the battery capacity is 400 amps, the constant discharge current is 100 amps, the constant charge current is 100 amps, and the constant charge voltage is 2.4 volts.

Battery capacity (Ah) 100 200 300 400 Discharge current (A) 30 60 90 100 End voltage U_b(V) 1.75 1.75 1.75 1.75 Charging current (A) 25 50 75 100 Charging voltage (V) 2.4 2.4 2.4 2.4 Number of cycles (N) 15 15 15 15

Table 1: Charge and discharge parameters of batteries with different capacities

During the charging process or discharging process in the cycle, check the surface temperature and appearance of the battery from time to time. If the temperature of the battery reaches 70 degrees Celsius or the appearance changes significantly, the test should be stopped immediately.

In step (5), the battery is placed in an environment of 25°C±2°C for 24 hours, and then charged at a constant voltage of 2.4V/cell with a current limit of I ₁₀ A until the current value is stable within 5 hours, the battery is considered to be is fully charged.

In step (6), when the surface temperature of the battery is 25°C±5°C, discharge with a current of I ₁₀ A until the average voltage of the single battery is 1.80V and terminate. Record the initial temperature t of the battery surface and the discharge duration T at the beginning of the discharge, and multiply the discharge current value I by the discharge duration T to calculate the measured capacity Ct of the battery. Calculate the actual capacity Ca of the battery according to the formula:

Example

Example 1

1. Take a certain type of 2V100AH (ampere-hour) battery cell.

Fully charge the battery: In an environment of 25°C±2°C, charge it with a constant voltage of 2.4V/cell (current limit I ₁₀ A, ie current limit 10A) until the current value is stable for 5 hours, and the battery is considered to be fully charged.

After fully charging, let it stand still for 1 hour. When the surface temperature of the battery is 25°C, perform capacity discharge.

Discharge with 10A current to terminate when the average voltage of the single battery is 1.80V. The recorded discharge duration is 11.1h, and the measured capacity 111Ah is calculated by multiplying the discharge current value 10A by the discharge duration 11.1h. Calculate the actual battery capacity 111Ah according to the formula.

2. Fully charge the battery (method in item 1), in a temperature environment of 60°C±1°C, set the discharge current to 30A, the end voltage to 1.75V, set the charge current to 25A after discharge, and the charge voltage is 2.4V. After the charging is completed, a discharge and charge cycle is formed, and the cycle is performed continuously for 15 times. Regularly measure the temperature of the battery and check the appearance. There is no abnormality. After 15 complete discharge and charge cycles, let the battery stand in an environment of 25°C±2°C for 24 hours, and fully charge the battery (method in item 1).

3. After fully charging, let it stand still for 1 hour, and when the surface temperature of the test battery is 27°C, conduct a capacity discharge test. Discharge with a current of 10A until the average voltage of the single battery is 1.80V; record the initial temperature of the battery surface at the beginning of the discharge of 27°C and the discharge duration of 8.9h, and calculate the measured capacity of 89Ah by multiplying the discharge current value of 10A by the discharge duration of 8.9h. According to the formula (1), the actual capacity Ca of the storage battery is 87.9Ah, which is greater than 0.8 times C10, and it is determined that the batch of storage batteries is qualified.

This process takes about 330 hours in total, which greatly reduces the battery life prediction cycle.

Example 2

1. Take a certain type of 2V200AH battery cell.

Fully charge the battery: In an environment of 25°C±2°C, charge it with a constant voltage of 2.4V/cell (current limit I ₁₀ A, ie current limit 20A) until the current value is stable for 5 hours, and the battery is considered to be fully charged.

After fully charged, let it stand still for 1 hour, and perform capacity discharge when the surface temperature of the battery is 26°C.

Discharge with 20A current until the average voltage of the single battery is 1.80V and terminate. The recorded discharge duration is 12.3h, and the measured capacity 246Ah is calculated by multiplying the discharge current value of 20A by the discharge duration of 12.3h. Calculate the actual battery capacity of 244.5Ah according to the formula.

2. Fully charge the battery (method in Item 1), in a temperature environment of 60°C±1°C, set the discharge current to 60A, the end voltage to 1.75V, set the charge current to 50A after discharge, and the charge voltage is 2.4V. After the charging is completed, a discharge and charge cycle is formed, and the cycle is performed continuously for 15 times. Regularly measure the temperature of the battery and check the appearance. There is no abnormality. After 15 complete discharge and charge cycles, put the battery in an environment of 25°C ± 2°C for 24 hours, and fully charge the battery (method in item 1).

3. After fully charging, let it stand still for 12 hours, and when the surface temperature of the test battery is 25°C, conduct a capacity discharge test. Discharge with a current of 20A until the average voltage of the single battery is 1.80V; record the initial temperature of the battery surface at the beginning of the discharge at 25°C and the discharge duration of 10.2h, and calculate the measured capacity of 202Ah by multiplying the discharge current value of 20A by the discharge duration of 10.2h. According to the formula, the actual capacity Ca of the battery is 202Ah, which is greater than 0.8 times C10, and it is judged that the battery of this batch is qualified.

This process takes about 380 hours in total, which greatly reduces the battery life prediction cycle.

Example 3

1. Take a certain type of 2V400AH battery cell.

Fully charge the battery: In an environment of 25°C±2°C, charge with a constant voltage of 2.4V/cell (current limit 40A) until the current value is stable for 5h, and the battery is considered to be fully charged.

After fully charging, let it stand still for 1 hour. When the surface temperature of the battery is 25°C, perform capacity discharge.

Discharge with a current of 40A until the average voltage of the single battery is 1.80V; the recorded discharge duration is 11.3h, and the measured capacity is calculated as 452Ah by multiplying the discharge current value of 40A by the discharge duration of 11.3h. Calculate the actual battery capacity of 452Ah according to the formula.

2. Fully charge the storage battery (method in item 1). The test is carried out in a temperature environment of 60°C ± 1°C. The discharge current is set to 100A, the end voltage is 1.75V, and the charge current is set to 100A after discharge. The voltage is 2.4V. After the charging is completed, a discharge and charge cycle is formed, and the cycle is performed continuously for 15 times. Regularly measure the temperature of the battery and check the appearance. There is no abnormality. After 15 complete discharge and charge cycles, put the battery in an environment of 25°C ± 2°C for 24 hours, and fully charge the battery (method in item 1).

3. After fully charging, let it stand still for 24 hours. When the surface temperature of the test battery is 25°C, conduct a capacity discharge test. Discharge with a current of 40A until the average voltage of the single battery is 1.80V; record the initial temperature of the battery surface at the beginning of the discharge of 25°C and the discharge duration of 9.8h, and calculate the measured capacity of 392Ah by multiplying the discharge current value of 40A by the discharge duration of 9.8h. According to the formula, the actual capacity Ca of the battery is 392Ah, which is greater than 0.8 times C10, and it is judged that the battery of this batch is qualified.

This process takes about 470 hours in total, which greatly reduces the battery life prediction period.

In the present invention, first randomly extract a storage battery, discharge it after it is fully charged, then enter a discharge-charge cycle after it is fully charged again, discharge after the cycle is completed, and calculate the measured capacity of the storage battery according to the recorded data, Calculate the actual capacity of the battery according to the formula, compare the relationship between the actual capacity and the measured capacity, and judge whether the battery is qualified. The invention adopts the high-temperature and high-current cycle charge-discharge working mode in the grid-connected life detection of the fixed valve-controlled lead-acid battery used in the communication power supply of the substation, which can rapidly age the battery life, greatly improve the detection speed, and can judge within 5 to 20 days Whether the battery life is qualified, the method is simple and easy to operate.

Claims (9)

1. a kind of accelerated aging detection method suitable for substation's communication power supply lead-acid accumulator, it is characterised in that: including Following steps:

(1) a battery is extracted, is stood after fully charged；

(2) when battery surface temperature is room temperature, electric power storage tank discharge is carried out, according to the actual measurement volumeter of battery after the completion of electric discharge Calculate the actual capacity of battery；

(3) battery is again filled with electricity；

(4) the battery of step (3) is put into 50~70 degrees Celsius of environment, starts to discharge, started to charge when being discharged to low-voltage Until battery is fully charged；

One discharge process and a charging process constitute a circulation, carry out 10~20 circulations；

By step (4) treated battery is placed on stood in room temperature environment after, battery is again filled with electricity；

(6) the battery (5) step handled continues to stand, and when electric power storage pool surface is room temperature, discharges, root after the completion of electric discharge The actual capacity of battery is calculated according to the actual measurement volumeter of battery；

(7) when actual capacity is greater than 0.8 times of C10, the battery is qualified；Otherwise battery is unqualified.

2. a kind of accelerated aging detection side suitable for substation's communication power supply lead-acid accumulator according to claim 1 Method, it is characterised in that: step (1) in, the battery of extraction is placed in 25 DEG C ± 2 DEG C of environment, with the constant of 2.4V/ monomer Voltage charges to when stablizing constant in current value 5 hours, it is believed that battery be it is fully charged, it is small to stand 1~24 after fully charged When.

3. a kind of accelerated aging detection side suitable for substation's communication power supply lead-acid accumulator according to claim 1 Method, it is characterised in that: step (2) in, when battery surface temperature be 25 DEG C ± 5 DEG C when, carry out electric power storage tank discharge, use I₁₀A electric current Discharge into termination when cell batteries average voltage is 1.80V；

Electric power storage pool surface initial temperature t and discharge period T when record electric discharge starts, are held with discharge current value I multiplied by electric discharge The actual measurement capacity C t of continuous time T calculating accumulator；

According to the actual capacity Ca of formula calculating accumulator

4. a kind of accelerated aging detection side suitable for substation's communication power supply lead-acid accumulator according to claim 1 Method, it is characterised in that: step (3) fully charged is: the battery of step (2) being placed in 25 DEG C ± 2 DEG C of environment, with 2.4V/ The constant voltage charging of monomer is to when stablizing constant in current value 5 hours, it is believed that battery is fully charged.

5. a kind of accelerated aging detection side suitable for substation's communication power supply lead-acid accumulator according to claim 1 Method, it is characterised in that: the environment temperature of step discharge process (4) and charging process is 60 ± 1 degrees Celsius, is carried out 15 times Circulation；

Discharge process is:

It is discharged to 1.75V/ monomer with constant discharge current, electric discharge is completed；

Charging process is:

It is charged with constant charge current and constant charge voltage.

6. a kind of accelerated aging detection side suitable for substation's communication power supply lead-acid accumulator according to claim 5 Method, it is characterised in that:

When battery capacity is 100 ampere-hours, the constant discharge current is 30 amperes, and the constant charge current is 25 amperes, institute Stating constant charge voltage is 2.4 volts；

When battery capacity is 200 ampere-hours, the constant discharge current is 60 amperes, and the constant charge current is 50 amperes, institute Stating constant charge voltage is 2.4 volts；

When battery capacity is 300 ampere-hours, the constant discharge current is 90 amperes, and the constant charge current is 75 amperes, institute Stating constant charge voltage is 2.4 volts；

When battery capacity is 400 ampere-hours, the constant discharge current is 100 amperes, and the constant charge current is 100 amperes, The constant charge voltage is 2.4 volts.

7. a kind of accelerated aging suitable for substation's communication power supply lead-acid accumulator according to claim 5 or 6 is examined Survey method, it is characterised in that: battery surface temperature and face shaping are constantly detected in charging process or discharge process, if electric power storage When pond temperature reaches 70 degrees Celsius or shape generation significant change, it should stop testing immediately.

8. a kind of accelerated aging detection side suitable for substation's communication power supply lead-acid accumulator according to claim 1 Method, it is characterised in that: step (5) in, battery is placed in 25 DEG C ± 2 DEG C of environment and stands 24 hours, then with 2.4V/ monomer Constant voltage charging is to when stablizing constant in current value 5 hours, it is believed that battery is fully charged.

9. a kind of accelerated aging detection side suitable for substation's communication power supply lead-acid accumulator according to claim 1 Method, it is characterised in that: step (6) in, when battery surface temperature be 25 DEG C ± 5 DEG C when, use I₁₀A current discharge is to monomer electric power storage Pond average voltage terminates when being 1.80V；

Electric power storage pool surface initial temperature t and discharge period T when record electric discharge starts, are held with discharge current value I multiplied by electric discharge The actual measurement capacity C t of continuous time T calculating accumulator；

According to the actual capacity Ca of formula calculating accumulator