A method for recovering deep charge-discharge capacity of a retired battery of a substation

Abstract

The application discloses a method for recovering deep charge-discharge capacity of a retired battery of a transformer substation, and relates to the technical field of lead-acid batteries of transformer substations. The method comprises the following steps: performing deep charge-discharge on the retired battery of the transformer substation by a battery test system, so as to recover the capacity of the retired battery of the transformer substation. The recovery method is easy to operate and implement. Without changing the component of the battery system and without damaging the structure of the battery, the method can realize performance repair of the battery by the laboratory battery test system without the aid of other complicated instruments and equipment. The repair effect is remarkable, the repair cost is low, and the battery reuse rate is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of substation lead-acid storage batteries, in particular to a method for recovering deep charge-discharge capacity of a retired storage battery in a substation. BACKGROUND

[0002] General valve-regulated lead-acid storage batteries (hereinafter referred to as storage batteries) are an important part of the ubiquitous power internet of things, and mainly provide stable, safe and reliable power support for intelligent sensing layer loads such as power distribution automation terminals, transmission line monitoring terminals, and substation detection terminals, to ensure the normal operation of various terminal control, protection, monitoring and communication functions in the field of transmission and distribution. When a fault occurs and the mains power is lost, the storage battery intervenes in power supply to ensure the normal operation of the terminal, complete functions such as two-way / three-way remote control, fault identification, rapid isolation, power restoration, online monitoring, and ensure the ubiquitous interconnection of various devices. Therefore, the reliability and stability of general valve-regulated lead-acid storage batteries are of great significance to ensure the safe operation of power equipment and ubiquitous interconnection.

[0003] At present, there are clear requirements for the coverage rate, construction principles and detection schemes of various terminal direct current power supplies. Due to factors such as long detection time, high requirements for detection equipment, and destructive detection, only the working voltage of the backup power supply is required to be measured. The actual capacity, consistency, group capacity, cycle life and other indicators that affect practicality of the backup power supply are not required, so some manufacturers use inferior products to pass the test. Even if the terminal equipment passes the pre-networking sampling inspection, it cannot operate stably for a long time, which seriously restricts the practicality of various automation systems in the field of transmission and distribution, and affects the reliable interconnection of the sensing layer of the ubiquitous power internet of things.

[0004] With the construction of the ubiquitous power internet of things, the number of various terminals invested is huge and the types are diverse. After being put into operation, the equipment cannot be used due to battery problems, and only simple scrap processing is performed, causing significant economic losses; and frequent disassembly and replacement of batteries also cause a huge manpower burden and exacerbate potential environmental risks.

[0005] In the substation direct current system, the storage battery group plays an extremely important and indispensable role. Normally, the direct current charging device carries the direct current load and performs floating charging on the storage battery group, and the storage battery group is in a floating charging standby state. When the alternating current loses power, the direct current charging device fails or is in an accident state, the storage battery group must provide energy to all direct current loads, such as direct current motors, electromagnetic mechanisms, protection devices, controls, communications, lighting, etc.

[0006] And the AC power supply in the substation is interrupted, the battery fails to provide DC power, the protection and control circuit loses the DC power and cannot act, the fault is stepped up, the 330kV and 110kV transformer continuously bears the short-circuit current, exceeds the thermal stability limit of the transformer, and causes the transformer to catch fire and burn.

[0007] Obviously, the battery pack is only a standby device in the power system at ordinary times, but in the accident state, the battery pack is the only power supply provider for the DC load, and once the battery has a problem, the power system will face paralysis and even major accidents, causing major losses.

[0008] Therefore, it is necessary to further strengthen the quality supervision of the battery, collect the full life data of the battery, evaluate the quality of the battery, provide guidance for material procurement and battery cascade utilization, and finally provide strong protection for the safe operation of the substation; meanwhile, the performance evaluation of the battery and the secondary utilization of the battery are developed to meet the different needs of the battery cascade utilization market. Since the lead-acid battery contains heavy metal lead, reducing the disposal amount of retired lead-acid batteries in the substation is beneficial to environmental protection, and one of the ways to reduce the disposal amount of the battery is to cascade utilize the retired battery with recoverable capacity to the substation for regular voltage and current monitoring.

[0009] At present, there are relevant reports on the repair work of retired batteries (retired batteries), for example, adding distilled water to the battery jar to dilute the acidic electrolyte can also achieve a certain repair effect, and Chinese patent CN101752616A realizes the online repair of the substation battery in this way. Chinese patent CN201110370649.9 discloses a lead-acid battery repair method based on the failure of the lead-acid battery, which comprises the following steps: fault visual inspection, detection, pre-charging, determination of the active slurry of the plate, injection of dilute acid or repair liquid, battery standing, recording of initial capacity, recording of discharge time and over-discharge time, determination of repair charging capacity and charging and discharging process, and repair according to different battery capacities. However, the existing detection method and battery capacity repair method (restoration method) need to disassemble the battery and add substances, and the performance of the battery may be affected. Therefore, how to restore the capacity of the retired battery of the substation without changing the component of the battery system and damaging the structure of the battery has become a problem to be solved by those skilled in the art. SUMMARY

[0010] The purpose of the present application is to provide a method for restoring the deep charging and discharging capacity of a retired battery of a substation, so as to restore the capacity of the retired battery of the substation without changing the component of the battery system and damaging the structure of the battery.

[0011] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0012] The application discloses a method for recovering deep charge-discharge capacity of a retired battery of a transformer substation.

[0013] The retired battery of the transformer substation is deeply charged by a battery test system, and the battery test system is set to 40 A constant current charging to 2.4 V of the battery voltage, and then to 2.4 V constant voltage for 8 hours in an environment of 25 DEG C + / - 5 DEG C.

[0014] The retired battery of the transformer substation is rested for 10 hours.

[0015] The retired battery of the transformer substation is deeply discharged by the battery test system, and the battery test system is set to 130 A constant current discharging to 1.5 V.

[0016] The retired battery of the transformer substation is deeply charged by the battery test system, and the battery test system is set to 50 A constant current charging to 2.4 V of the battery voltage, and then to 2.4 V constant voltage for 8 hours.

[0017] The retired battery of the transformer substation is rested for 10 hours.

[0018] The retired battery of the transformer substation is deeply discharged by the battery test system, and the battery test system is set to 140 A constant current discharging to 1.5 V.

[0019] The retired battery of the transformer substation is rested for 10 hours.

[0020] The retired battery of the transformer substation is deeply charged by the battery test system, and the battery test system is set to 60 A constant current charging to 2.4 V of the battery voltage, and then to 2.4 V constant voltage for 8 hours in an environment of 25 DEG C + / - 5 DEG C.

[0021] The retired battery of the transformer substation is rested for 10 hours.

[0022] The retired battery of the transformer substation is deeply discharged by the battery test system, and the battery test system is set to 150 A constant current discharging to 1.5 V, so that the retired battery of the transformer substation with recovered capacity is obtained.

[0023] Optionally, before the retired battery of the transformer substation is deeply charged by the battery test system, and the battery test system is set to 40 A constant current charging to 2.4 V of the battery voltage, and then to 2.4 V constant voltage for 8 hours in an environment of 25 DEG C + / - 5 DEG C, the method further comprises:

[0024] The retired battery of the transformer substation is detected in an electrical performance detection area by the battery test system, so that the capacity, the terminal voltage and the internal resistance of the retired battery of the transformer substation are obtained.

[0025] Optionally, the deep discharging of the substation retired battery by the battery testing system sets the battery testing system to constant current discharge at 150A to 1.5V, obtains the capacity-restored substation retired battery, and then further comprises:

[0026] The capacity-restored substation retired battery is subjected to electrical performance detection in the electrical performance detection area by using the battery testing system, battery capacity, battery terminal voltage, and battery internal resistance test and cycle durability test are completed, and the capacity, terminal voltage, internal resistance, and charge-discharge cycle life of the capacity-restored substation retired battery are obtained.

[0027] Optionally, the electrical performance detection of the capacity-restored substation retired battery in the electrical performance detection area by using the battery testing system completes battery capacity, battery terminal voltage, and battery internal resistance test, and the capacity, terminal voltage, and internal resistance of the capacity-restored substation retired battery are obtained.

[0028] The capacity-restored substation retired battery is subjected to electrical performance detection in the electrical performance detection area by using the battery testing system, battery capacity, battery terminal voltage, and battery internal resistance test and cycle durability test are completed, and the capacity, terminal voltage, internal resistance, and charge-discharge cycle life of the capacity-restored substation retired battery are obtained.

[0029] The capacity-restored substation retired battery is subjected to electrical performance detection in the electrical performance detection area by using the battery testing system, battery capacity, battery terminal voltage, and battery internal resistance test and cycle durability test are completed, and the capacity, terminal voltage, internal resistance, and charge-discharge cycle life of the capacity-restored substation retired battery are obtained.

[0030] Optionally, the electrical performance detection of the capacity-restored substation retired battery in the electrical performance detection area by using the battery testing system completes cycle durability test, and the charge-discharge cycle life of the capacity-restored substation retired battery is obtained.

[0031] The capacity-restored substation retired battery is subjected to complete charging, and the battery that has passed the capacity test and reaches the rated capacity value after complete charging is obtained.

[0032] The battery that has passed the capacity test and reaches the rated capacity value after complete charging is subjected to cycle durability test in an environment of 25℃±2℃.

[0033] Optionally, the cycle durability test specifically comprises:

[0034] The battery after full charging and reaching the rated capacity value through capacity test is discharged at a constant current of 40A for 2h, and then charged at a constant voltage of 2.4V for 22h, after 50 cycles, the battery is not recharged for 10-hour rate capacity test; the discharge capacity is calculated, when the discharge capacity is greater than or equal to 0.76 times of the rated capacity, the battery after full charging is subjected to the next 50 times of discharge and charge cycle; the next 50 times of discharge and charge cycle is that the battery is discharged at a constant current of 40A for 2h, and then charged at a constant voltage of 2.4V for 22h, while limiting the current to 40A, and cycled for 50 times.

[0035] Optionally, the process of charging at a constant voltage of 2.4V for 22h is limited to 40A.

[0036] Optionally, the capacity-restored substation retired battery is subjected to electrical performance detection in an electrical performance detection area by using a battery test system, to complete battery capacity test, battery terminal voltage test, battery internal resistance test and cycle durability test, to obtain the capacity, terminal voltage, internal resistance and charge-discharge cycle life of the capacity-restored substation retired battery, and then further comprising:

[0037] According to the capacity, terminal voltage and internal resistance of the substation retired battery, and the capacity, terminal voltage, internal resistance and charge-discharge cycle life of the capacity-restored substation retired battery, a battery capacity parameter table is constructed; the battery capacity parameter table is used for directly displaying the parameters of the substation retired battery before and after capacity restoration; the parameters include initial voltage, 1st 10h discharge capacity, 2nd 10h discharge capacity, 3rd 10h discharge capacity, 3h discharge capacity, 4th 10h discharge capacity, 1h discharge capacity, internal resistance, mass and charge-discharge cycle life.

[0038] According to the specific embodiments provided by the application, the following technical effects are disclosed:

[0039] The substation retired battery deep charge-discharge capacity restoration method disclosed by the application restores the capacity of the substation retired battery by deep charge-discharge of the battery test system, is easy to operate and implement, does not need to change the components of the battery system or damage the structure of the battery, does not need to rely on other complex instruments and equipment, can realize battery performance repair only by the laboratory battery test system, has remarkable repair effect, has low repair cost, and has high battery recycling rate. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0041] Figure 1 Flow chart of the substation retired battery deep charge-discharge capacity recovery method embodiment of the present application,

[0042] Figure 2 Schematic diagram of the substation retired battery deep charge-discharge capacity recovery method of the present application. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] The purpose of the present application is to provide a substation retired battery deep charge-discharge capacity recovery method, so as to recover the capacity of the substation retired battery without changing the battery system components and without damaging the battery structure.

[0045] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0046] Figure 1 Flow chart of the substation retired battery deep charge-discharge capacity recovery method embodiment of the present application, Figure 2 Schematic diagram of the substation retired battery deep charge-discharge capacity recovery method of the present application. Referring to Figure 1 and Figure 2 The substation retired battery deep charge-discharge capacity recovery method of the present application includes the following steps:

[0047] Step 101: deep charge the substation retired battery through a battery test system, set the battery test system to 40A constant current charging to 2.4V of the battery voltage in an environment of 25℃±5℃, and then convert to 2.4V constant voltage for 8h.

[0048] This step 101 further includes:

[0049] The electrical performance of the retired substation battery is detected by using the battery test system in the electrical performance detection area, the capacity of the battery, the terminal voltage of the battery and the internal resistance of the battery are tested, and the capacity, the terminal voltage and the internal resistance of the retired substation battery are obtained.

[0050] Step 102: The retired substation battery is placed for 10h.

[0051] Step 103: The retired substation battery is deeply discharged by using the battery test system, and the battery test system is set to 130A constant current discharge to 1.5V.

[0052] Step 104: The retired substation battery is deeply charged by using the battery test system, and the battery test system is set to 50A constant current charging to 2.4V of the battery voltage, and then to 2.4V constant voltage for 8h.

[0053] Step 105: The retired substation battery is placed for 10h.

[0054] Step 106: The retired substation battery is deeply discharged by using the battery test system, and the battery test system is set to 140A constant current discharge to 1.5V.

[0055] Step 107: The retired substation battery is placed for 10h.

[0056] Step 108: The retired substation battery is deeply charged by using the battery test system, and the battery test system is set to 60A constant current charging to 2.4V of the battery voltage in an environment of 25℃±5℃, and then to 2.4V constant voltage for 8h.

[0057] Step 109: The retired substation battery is placed for 10h.

[0058] Step 110: The retired substation battery is deeply discharged by using the battery test system, and the battery test system is set to 150A constant current discharge to 1.5V, and the capacity recovery of the retired substation battery is obtained.

[0059] The step 110 further comprises:

[0060] The electrical performance of the capacity recovery of the retired substation battery is detected by using the battery test system in the electrical performance detection area, the capacity of the battery, the terminal voltage of the battery, the internal resistance of the battery and the cycle durability test are tested, and the capacity, the terminal voltage, the internal resistance and the charge-discharge cycle life of the capacity recovery of the retired substation battery are obtained.

[0061] The substation retired battery with capacity recovery is detected in the electrical performance detection area by using the battery test system to complete the battery capacity, battery terminal voltage, battery internal resistance test and cycle durability test, and the capacity, terminal voltage, internal resistance and charge-discharge cycle life of the substation retired battery with capacity recovery are obtained, and then the following steps are further included:

[0062] A battery capacity parameter table is constructed according to the capacity, terminal voltage and internal resistance of the substation retired battery and the capacity, terminal voltage, internal resistance and charge-discharge cycle life of the substation retired battery with capacity recovery; the battery capacity parameter table is used for directly displaying the parameters of the substation retired battery before and after capacity recovery; the parameters include initial voltage, 1st 10h discharge capacity, 2nd 10h discharge capacity, 3rd 10h discharge capacity, 3h discharge capacity, 4th 10h discharge capacity, 1h discharge capacity, internal resistance, mass and charge-discharge cycle life.

[0063] Specifically, the substation retired battery with capacity recovery is detected in the electrical performance detection area by using the battery test system to complete the battery capacity, battery terminal voltage, battery internal resistance test and cycle durability test, and the capacity, terminal voltage, internal resistance and charge-discharge cycle life of the substation retired battery with capacity recovery are obtained, and the following steps are further included:

[0064] The substation retired battery with capacity recovery is detected in the electrical performance detection area by using the battery test system to complete the battery capacity, battery terminal voltage and battery internal resistance test, and the capacity, terminal voltage and internal resistance of the substation retired battery with capacity recovery are obtained.

[0065] The substation retired battery with capacity recovery is detected in the electrical performance detection area by using the battery test system to complete the cycle durability test, and the charge-discharge cycle life of the substation retired battery with capacity recovery is obtained.

[0066] Specifically, the substation retired battery with capacity recovery is detected in the electrical performance detection area by using the battery test system to complete the cycle durability test, and the charge-discharge cycle life of the substation retired battery with capacity recovery is obtained, and the following steps are further included:

[0067] The substation retired battery with capacity recovery is fully charged to obtain the battery with rated capacity value after capacity test after full charging.

[0068] The battery with rated capacity value after capacity test after full charging is subjected to cycle durability test in an environment of 25℃±2℃.

[0069] Specifically, the cycle durability test specifically includes:

[0070] After the battery which has reached the rated capacity value through the capacity test after full charging is discharged at a constant current of 40 A for 2 h, it is charged at a constant voltage of 2.4 V for 22 h, after 50 cycles, the battery is subjected to a 10-hour rate capacity test without recharging; the discharge capacity is calculated, when the discharge capacity is greater than or equal to 0.76 times the rated capacity, the battery is subjected to the next 50 cycles of discharging and charging after full charging; the next 50 cycles of discharging and charging are that the battery is discharged at a constant current of 40 A for 2 h, then charged at a constant voltage of 2.4 V for 22 h, while the current is limited to 40 A, and cycled for 50 times.

[0071] In the process of charging at a constant voltage of 2.4 V for 22 h, the current is limited to 40 A.

[0072] The technical scheme of the present application is described below with one specific embodiment:

[0073] The capacity of the retired battery of the substation in Inner Mongolia power grid is recovered by using the deep charging and discharging capacity recovery method for the retired battery of the substation of the present application, which is as follows:

[0074] Firstly, the electrical performance of the retired battery of the substation is detected in the electrical performance detection area by using the existing battery test system, the terminal voltage, capacity and battery internal resistance are tested, according to the application condition requirements of the battery of the substation in Inner Mongolia power grid, the capacity of the battery is mainly required, the 10-hour rate capacity should be not less than 0.95 times the rated capacity at the first cycle, the rated capacity should be reached at the third cycle, the 3-hour rate capacity should be 0.75 times the rated capacity, and the 1-hour rate capacity should be 0.55 times the rated capacity.

[0075] (I) Capacity, voltage and internal resistance test (process of battery capacity, terminal voltage and internal resistance test)

[0076] A. After the battery is fully charged, it is left for 1 h to 24 h, when the surface temperature of the battery is 25℃±5℃, the capacity discharge test is carried out. The 10-hour rate capacity is discharged at a current of 20 A until the average voltage of the single battery is 1.8 V; the 3-hour rate capacity is discharged at a current of 50 A until the average voltage of the single battery is 1.7 V; the 1-hour rate capacity is discharged at a current of 110 A until the average voltage of the single battery is 1.60 V, and the average initial surface temperature t of the battery at the beginning of discharge and the discharge duration T are recorded.

[0077] B. The terminal voltage and surface temperature of the single battery are measured and recorded during the discharge, the interval is 1 h for the 10-hour rate capacity test, 30 min for the 3-hour rate capacity test, and 10 min for the 1-hour rate capacity test. At the end of the discharge, it is measured at any time to determine the accurate time of discharging the battery to the terminal voltage.

[0078] C. During discharging, the fluctuation of discharging current shall not exceed ±1% of the specified value.

[0079] D. The measured capacity C(Ah) is calculated by multiplying the discharging current value I(A) by the discharging duration T(h).

[0080] E. When the average surface temperature of the battery during discharging is not the reference 25℃, the actual capacity C at the reference temperature of 25℃ shall be converted according to the formula (1). a .

[0081]

[0082] In the formula, t represents the average surface temperature of the battery during discharging, in ℃; C t represents the measured capacity at the average surface temperature of t℃, in Ah; C a represents the capacity at the reference temperature of 25℃ (actual capacity at the reference temperature of 25℃), in Ah; γ represents the temperature coefficient, in 1 / ℃; C 10 and C3 γ = 0.006; C1 γ = 0.01.

[0083] The battery capacity is calculated by the above formula, and the battery terminal voltage and internal resistance can be directly measured from the battery test system software.

[0084] After discharging, the battery shall be fully charged.

[0085] The above steps of testing capacity, voltage and internal resistance are the test steps in the standard GB / T 19638.1-2014 "Stationary Valve-Regulated Lead-Acid Batteries Part 1: General Requirements".

[0086] (II) Cycle Durability Test

[0087] After the battery reaches the rated capacity value through the capacity test, it is fully charged and then continuously discharged and charged in an environment of 25℃±2℃ according to the following method:

[0088] a. Discharge at a constant current of 40A for 2h;

[0089] b. Charge at a constant voltage of 2.4V (current limit 40A) for 22h.

[0090] c. After 50 such cycles, the battery is not recharged and then tested for 10-hour rate capacity. Calculate the discharge capacity C a (25℃).

[0091] When the discharge capacity is not less than 0.76 times the rated capacity, the battery is fully charged and then subjected to the next 50 discharge and charge cycles.

[0092] Because it is a substation retired battery, there are unqualified phenomena in voltage or capacity. The experimental data before deep charge and discharge (before capacity recovery) are shown in Table 1.

[0093] The data and steps of the above cycle durability test method are data and experimental step sequences found by experiments.

[0094] (Three) deep charge and discharge process (battery deep charge and discharge process)

[0095] (1) The specific process of deep charge and discharge of the battery by the battery test system is as follows:

[0096] A. Deep charge and discharge of the battery by the battery test system, in an environment of 25±5℃, set the battery test system to 40A constant current charging to 2.4V of the battery voltage, then to 2.4V constant voltage for 8h.

[0097] B. The battery is static for 10h.

[0098] C. Set the battery test system to 130A constant current discharge to 1.5V.

[0099] D. Set the battery test system to 50A constant current charging to 2.4V of the battery voltage, then to 2.4V constant voltage for 8h.

[0100] E. The battery is static for 10h.

[0101] F. Set the battery test system to 140A constant current discharge to 1.5V.

[0102] G. The battery is static for 10h.

[0103] H. Deep charge and discharge of the battery, in an environment of 25±5℃, set the battery test system to 60A constant current charging to 2.4V of the battery voltage, then to 2.4V constant voltage for 8h.

[0104] I. The battery is static for 10h.

[0105] J. Set the battery test system to 150A constant current discharge to 1.5V.

[0106] In the above specific process of deep charge and discharge of the battery by the battery test system, the A-J step charge and discharge voltage and current data are the optimal charge and discharge current and voltage data obtained by repeated laboratory experiments. At present, there is no such comprehensive battery deep charge and discharge technology for batteries in the existing technology.

[0107] The application substation retired battery deep charge-discharge capacity recovery method, through the electrical performance test deep charge-discharge experiment process (i.e. the above-mentioned specific process of deep charge-discharge of the battery by the battery test system A-J steps), the purpose of battery capacity recovery is achieved, the recovery method is easy to operate and realize, without changing the battery system component, without damaging the battery structure, without the help of other complex instruments and equipment, only through the laboratory battery test system can realize the battery performance repair, the repair effect is remarkable, the repair cost is lower, the battery recycling rate is high, solves the retired battery step reuse problem.

[0108] (2) The battery after deep charge-discharge is tested for terminal voltage, capacity, cycle durability test, battery internal resistance and the like, and the test data is shown in Table 1.

[0109] Briefly, the capacity of the retired battery of the substation of Inner Mongolia power grid is recovered by the application substation retired battery deep charge-discharge capacity recovery method, and the process is as follows:

[0110] Firstly, the retired battery is tested for capacity, voltage and internal resistance, which is equivalent to the basic data, then the deep charge-discharge step is carried out, i.e. the deep charge-discharge process, and then the capacity, voltage and internal resistance test and the cycle durability test are carried out again to see the effect of the method after deep charge-discharge.

[0111] The different brands and rated capacities of No. 1, No. 2 and No. 3 lead-acid batteries are tested, the rated capacity of No. 1 lead-acid battery is 200 Ah, the rated capacity of No. 2 lead-acid battery is 200 Ah, and the rated capacity of No. 3 lead-acid battery is 200 Ah.

[0112] Table 1 Battery capacity parameter table

[0113]

[0114]

[0115] The electrical performance determination standard: according to the application situation of the substation battery, the capacity of the battery is tested, and the capacity of the battery should meet the requirements in the "Fixed Valve Control Type Lead-acid Battery Part 1 Technical Conditions" (GB / T 19638.1-2014). The 10-hour rate capacity of the battery with rated capacity of 200 Ah should reach 190 Ah in the first cycle, 200 Ah in the third cycle, 3-hour rate capacity should reach 150 Ah, and 1-hour rate capacity should reach 110 Ah. As shown in Table 1, taking the selected three batteries as an example, the capacity index of the battery before deep charge-discharge does not meet the use requirements, and after deep charge-discharge, the capacity index of the battery meets the practical requirements, and the cycle number of the battery is improved by more than 2 times, which ensures the quality of the battery recycling.

[0116] The substation retired battery deep charge-discharge capacity recovery method disclosed in the application recovers the capacity of the retired battery by deep charge-discharge through laboratory instruments from the perspective of electrical performance, and the batteries with recoverable capacity are used in gradient to the substation for regular voltage and current monitoring, thereby reducing the disposal amount of the batteries.

[0117] The substation retired battery deep charge-discharge capacity recovery method disclosed in the application recovers the capacity of the retired battery by deep charge-discharge through laboratory instruments from the perspective of electrical performance, and the batteries with recoverable capacity are used in gradient to the substation for regular voltage and current monitoring, thereby reducing the disposal amount of the batteries.

[0118] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0119] The principles and implementation manners of the application are described by applying specific examples herein, and the above description of the embodiments is only used to help understand the method of the application and its core idea; meanwhile, for the general technical personnel in the field, the specific implementation manners and application ranges will be changed according to the idea of the application. In conclusion, the content of the specification should not be understood as the limitation of the application.

Claims

1. A method for recovering deep charge-discharge capacity of a substation decommissioned battery, characterized by, The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises:

2. The substation decommissioned battery depth charge-discharge capacity recovery method according to claim 1, characterized by, The method comprises: The method comprises:

3. The substation decommissioned battery depth charge-discharge capacity recovery method according to claim 2, characterized by, The method comprises: The method comprises:

4. The substation decommissioned battery depth charge-discharge capacity recovery method according to claim 3, characterized by, The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The decommissioned batteries of the substation with restored capacity are tested for electrical performance using a battery testing system in the electrical performance testing area. The battery capacity, battery terminal voltage and battery internal resistance are tested to obtain the capacity, terminal voltage and internal resistance of the decommissioned batteries of the substation with restored capacity. The decommissioned batteries from the substation with restored capacity are subjected to electrical performance testing using a battery testing system in the electrical performance testing area. The cycle durability test is completed to obtain the charge-discharge cycle life of the decommissioned batteries from the substation with restored capacity.

5. The substation decommissioned battery depth charge-discharge capacity recovery method according to claim 4, characterized by, The decommissioned substation batteries with restored capacity are subjected to electrical performance testing using a battery testing system in the electrical performance testing area. Cycle durability testing is completed to obtain the charge-discharge cycle life of the decommissioned substation batteries with restored capacity, specifically including: The decommissioned batteries of the substation whose capacity has been restored are fully charged to obtain batteries that have reached their rated capacity value after a capacity test after full charging. Batteries that have reached their rated capacity after being fully charged are subjected to cycle durability tests in an environment of 25℃±2℃.

6. The substation decommissioned battery depth charge-discharge capacity recovery method according to claim 5, characterized by, The cyclic durability test specifically includes: After a full charge, the battery that has reached its rated capacity in a capacity test is discharged at a constant current of 40A for 2 hours, followed by charging at a constant voltage of 2.4V for 22 hours. After 50 cycles, the battery undergoes a 10-hour rate capacity test without recharging. The discharge capacity is calculated. When the discharge capacity is greater than or equal to 0.76 times the rated capacity, the battery is fully charged and then subjected to another 50 discharge-charge cycles. The next 50 discharge-charge cycles consist of discharging the battery at a constant current of 40A for 2 hours, followed by charging at a constant voltage of 2.4V for 22 hours, while limiting the current to 40A, for 50 cycles.

7. The substation decommissioned battery depth charge-discharge capacity recovery method according to claim 6, characterized by, The battery, after being fully charged and reaching its rated capacity through a capacity test, is discharged at a constant current of 40A for 2 hours, and then charged at a constant voltage of 2.4V for 22 hours. During the 22 hours of charging at a constant voltage of 2.4V, the current is limited to 40A.

8. The substation decommissioned battery deep charge-discharge capacity recovery method according to claim 3, characterized by, The decommissioned substation batteries, after capacity restoration, undergo electrical performance testing in the electrical performance testing area using a battery testing system. This includes testing the battery capacity, terminal voltage, internal resistance, and cycle durability to obtain the capacity, terminal voltage, internal resistance, and charge / discharge cycle life of the restored decommissioned substation batteries. The process further includes: Based on the capacity, terminal voltage, and internal resistance of the decommissioned batteries from the substation, as well as the capacity, terminal voltage, internal resistance, and charge / discharge cycle life of the decommissioned batteries from the substation after capacity restoration, a battery capacity parameter table is constructed. The battery capacity parameter table is used to visually display the parameters of the decommissioned batteries from the substation before and after capacity restoration. The parameters include initial voltage, first 10-hour discharge capacity, second 10-hour discharge capacity, third 10-hour discharge capacity, 3-hour discharge capacity, fourth 10-hour discharge capacity, 1-hour discharge capacity, internal resistance, mass, and charge / discharge cycle life.

Images