CN113488708B - Method for recycling unqualified storage battery pack - Google Patents

Abstract

The invention discloses a method for recycling an unqualified storage battery pack, which comprises the steps of screening, reselecting, repairing and reorganizing, wherein each single battery of the unqualified storage battery pack is fully charged during screening, the internal resistance of each single battery is obtained, screening is carried out according to the internal resistance, and repairable single batteries are selected; when in reselection, primary combination is carried out on repairable single batteries to form a primary storage battery pack, a charge and discharge test is carried out on the primary storage battery pack, the capacity of each repairable single battery is obtained, screening is carried out according to the capacity, and the single battery to be repaired is selected; when repairing, repairing each single battery to be repaired by using high-frequency pulse; and (3) measuring the capacity of the repaired single battery during recombination, and recombining according to the capacity to form a recombined storage battery pack, wherein the recombined storage battery pack is put into use or stored. Therefore, the invention can effectively prolong the service life of the battery, avoid the waste caused by the replacement of the whole battery set and can manage the battery normally.

Description

Method of Recycling Unqualified Battery Pack

technical field

The invention relates to the technical field of accumulator regeneration, in particular to a method for regenerating unqualified accumulator sets.

Background technique

At present, the backup battery pack of the DC system, due to the vulcanization of the battery, the capacity of one or more cells is insufficient, which in turn affects the normal operation of the entire battery pack, and the entire set needs to be replaced. The investment is large and the timeliness is not high, which seriously affects the DC power supply. The security of the daily operation of the system.

At this stage, batteries only have supervision means for the two nodes of network access test and network operation, while temporary storage of batteries, temporary storage of decommissioned batteries, temporary storage of repaired batteries, etc. lack supervision means, and there are batteries in each stage of temporary storage. The self-discharge phenomenon seriously affects the health of the battery. Only by accurately monitoring the battery throughout the entire cycle can the battery be managed best.

Contents of the invention

In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a method for recycling unqualified battery packs, which can effectively prolong the service life of the batteries, avoid waste caused by the replacement of the whole battery pack, and manage the batteries in a standardized manner.

In order to solve the problems of the technologies described above, the technical solution of the present invention is:

A method for recycling unqualified battery packs, comprising the following steps:

Step 1. Screening: Fully charge each single battery of the unqualified battery pack, then obtain the internal resistance of each single battery, screen according to the internal resistance, and select a repairable single battery;

Step 2. Reselection: Combine the repairable single cells for the first time to form the primary storage battery pack, conduct charge and discharge tests on the primary storage battery pack, obtain the capacity of each repairable single cell, screen according to the capacity, and select the one to be repaired Single battery;

Step 3. Repair: Use high-frequency pulses to repair each single battery to be repaired;

Step 4. Recombination: measure the capacity of the repaired single cells, and reassemble according to the capacity to form a reorganized battery pack, which is put into use or stored.

The preferred method is that the step three is specifically: using a high-frequency pulse repair instrument to repair the single battery to be repaired, using 2-3 cycles, and the charge and discharge current is gradually increased from the current of less than 10 hours to the current of 10 hours, Set the waiting time after the discharge is completed, let the single battery to be repaired cool down and start charging. The charging setting time is at least twice the discharge time to ensure that the single battery to be repaired is fully charged.

Preferably, the standard for the initial combination in the second step is: combine repairable single batteries with similar brands, nominal capacities, and years into a group.

Preferably, before the step 1, the following steps are also included: identification: set a label barcode or two-dimensional code on the unqualified battery, and the wireless transmission terminal recognizes the label barcode or two-dimensional code, and transmits the corresponding unqualified battery. Identify signals to the control platform.

Preferably, the step of fully charging each single cell of the unqualified battery pack in the first step includes:

Build at least one DC system;

Connect at least four sets of normal battery packs in parallel under each DC system;

Fully charge each single cell of the marked unqualified battery pack.

Preferably, in the first step, the step of obtaining the internal resistance of each single battery, screening according to the internal resistance, and selecting a repairable single battery includes:

Using an internal resistance meter to measure the internal resistance of the single battery, the internal resistance meter transmits the internal resistance signal corresponding to the internal resistance of each single cell to the control platform;

The control platform matches the internal resistance signal with the preset internal resistance;

According to the matching results, each single battery is classified into Class A, Class B or Class C;

Type A and B single cells are regarded as repairable single cells, and type C is excluded as irreparable.

Preferably, the step 2 specifically includes:

The initial combination of Class A and Class B repairable single cells to form the initial battery pack;

Conduct charge and discharge tests on the initial battery pack to obtain the capacity of each repairable single battery;

Match the capacity of each repairable single battery with the preset capacity;

According to the matching results, the repairable single battery is classified into the first category, the second category or the third category;

The first category is the finished battery, the second category is the battery to be repaired, and the third category is excluded and not repaired.

The preferred mode is that in the fourth step, the principle of recombination includes:

(1) The grouping is carried out in the single battery of the same circuit;

(2) 0.1CA discharge capacity ≥ 100%;

(3) After standing for 72 hours, the open circuit voltage of the single battery is 220-223v/pc;

(4) After standing for 72 hours, the open circuit voltage difference of the single cells in the same group is ≤10mV;

(5) During the discharge stage of capacity detection, at the termination point or measurement point, the discharge voltage difference of the single cells in the same group is ≤50mV.

The preferred mode is that the storage of the reorganized battery pack in the step 4 includes:

Let the reassembled battery packs be in the state of floating charging, and multiple sets are connected in parallel;

The standard reorganized batteries are composed of 220V system battery packs. If there are unmatched batteries left after reorganization, they can be divided into 48V systems for floating charging.

Preferably, in the screening, reselecting, repairing and/or recombining steps, the cell voltage of each cell is obtained, and the cell voltage is transmitted to the control platform.

After adopting above-mentioned technical scheme, the beneficial effect of the present invention is:

Because the method for recycling unqualified battery packs of the present invention includes the steps of screening, reselection, repair and reorganization, when screening, each single cell of the unqualified battery pack is fully charged, and then the internal resistance of each single cell is obtained, according to The internal resistance is screened to select the repairable single battery; when reselecting, the repairable single battery is combined for the first time to form the initial battery pack, and the charge and discharge test is carried out on the initial battery pack to obtain the capacity of each repairable single battery , to screen according to the capacity, and select the single battery to be repaired; to repair each single battery to be repaired by using high-frequency pulse; Reorganize the battery pack, put the reorganized battery pack into use or reserve. Therefore, the present invention can effectively prolong the service life of the battery, avoid waste caused by replacing the entire battery pack, and can manage the battery in a standardized manner.

Before step 1, the following steps are also included: identification: set label barcode or two-dimensional code on the unqualified storage battery, the wireless transmission terminal recognizes the label barcode or two-dimensional code, and transmits the identification signal corresponding to the unqualified storage battery to the control platform ; Improve screening efficiency and achieve effective management.

Because in step 1, the internal resistance of each single battery is obtained, and the step of selecting a repairable single battery is carried out according to the internal resistance, including: using an internal resistance meter to measure the internal resistance of the single battery, and the internal resistance meter transmits the internal resistance of each single battery. The internal resistance signal corresponding to the internal resistance of the body pool is sent to the control platform; the control platform matches the internal resistance signal with the preset internal resistance; Class B single cells are used as repairable single cells, while Class C excludes unrepairable batteries and discharges unrepairable batteries to improve repair efficiency.

As for the second step, it specifically includes: first combining Class A and Class B repairable single batteries to form the initial storage battery pack; conducting charge and discharge tests on the initial storage battery pack to obtain the capacity of each repairable single battery; The capacity of the repaired single battery is matched with the preset capacity; according to the matching result, the repairable single battery is divided into the first type, the second type or the third type; the first type is the finished battery, and the second type is the battery to be repaired Batteries, the third category is eliminated and not repaired, further improving the repair efficiency.

In the screening, reselection, repair and/or reorganization steps, the cell voltage of each cell is obtained, and the cell voltage is transmitted to the control platform to detect the health status of each cell in real time and properly manage the battery.

To sum up, the method for recycling unqualified battery packs of the present invention solves the technical problems in the prior art that unqualified batteries are not under full-cycle and full-cycle supervision, resulting in limited battery life and increased costs for battery replacement. Screen, reselect, repair and reorganize unqualified batteries to effectively extend the service life of batteries, avoid waste caused by the replacement of the entire battery pack, and monitor the health status of batteries throughout the entire process to achieve standardized management.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the following examples further describe the present invention in detail. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

A method for recycling unqualified battery packs, comprising the following steps:

Step 1. Screening: Fully charge each single battery of the unqualified battery pack, then obtain the internal resistance of each single battery, screen according to the internal resistance, and select a repairable single battery;

Step 2. Reselection: Combine the repairable single cells for the first time to form the primary storage battery pack, conduct charge and discharge tests on the primary storage battery pack, obtain the capacity of each repairable single cell, screen according to the capacity, and select the one to be repaired Single battery; the standard for the initial combination in this example is: combine single batteries to be repaired with similar brands, nominal capacities, and years into a group.

Step 3. Repair: Use high-frequency pulses to repair each single battery to be repaired;

Step 4. Reorganization: measure the capacity of the repaired single battery, and recombine according to the capacity to form a reorganized battery pack, which is put into use or stored; the reorganization principles in this example include:

(1) The grouping is carried out in the single battery of the same circuit;

(2) 0.1CA discharge capacity ≥ 100%;

(3) After standing for 72 hours, the open circuit voltage of the single battery is 220-223v/pc;

(4) After standing for 72 hours, the open circuit voltage difference of the single cells in the same group is ≤10mV;

(5) During the discharge stage of capacity detection, at the termination point or measurement point, the discharge voltage difference of the single cells in the same group is ≤50mV.

After adopting the method of the present invention, unqualified batteries are reassembled after four steps of screening, reselection, repair and reorganization, effectively prolonging the service life of the batteries, avoiding waste caused by replacement of the entire battery pack, and monitoring the health status of the batteries throughout the whole process, To achieve standardized management.

Step 3 is specifically: use a high-frequency pulse repair instrument to repair the single battery to be repaired, and use 2-3 cycles. The charging and discharging current is gradually increased from the current of less than 10 hours to the current of 10 hours. Set the waiting time to allow the single battery to be repaired to cool down and start charging. The charging setting time is at least twice the discharge time to ensure that the single battery to be repaired is fully charged.

The high-frequency pulse repair instrument can be automatically performed according to the set parameters, and multiple cycles can be set. The parameters of each cycle can be set differently, and the gradual setting is adopted to improve the repair efficiency. During the testing process of the tester, the voltage of each battery cell is collected wirelessly, matched with the battery barcode, and the data is sent to the background for record and analysis. After the same test is completed, the capacity status data of each battery can be read through the handheld terminal. Not only that, but also the data information can be read through the handheld terminal during the repair process. At this time, the read status is the last cycle test status value of the battery.

Before step 1, this example also includes the following steps: identification: set the label barcode or two-dimensional code on the unqualified battery, the wireless transmission terminal recognizes the label barcode or two-dimensional code, and transmits the identification signal corresponding to the unqualified battery to the control platform.

In step 1 of this example, the steps of fully charging each single battery of the unqualified battery pack include:

Build at least one DC system;

Connect at least four sets of normal battery packs in parallel under each DC system;

Fully charge each single cell of the marked unqualified battery pack.

In step 1 of this example, the internal resistance of each single battery is obtained, and screening is performed according to the internal resistance to select a repairable single battery. The steps include:

Use the internal resistance meter to measure the internal resistance of the single battery, and the internal resistance meter transmits the internal resistance signal corresponding to the internal resistance of each single cell to the control platform;

The control platform matches the internal resistance signal with the preset internal resistance;

According to the matching results, each single battery is classified into Class A, Class B or Class C;

Type A and B single cells are regarded as repairable single cells, and type C is excluded as irreparable.

Due to the large number of single cells, individual single cells are seriously behind. For example, Type C batteries cannot be repaired. In order to avoid duplication of work and affect efficiency, a preliminary quick screening can be carried out to remove faulty Type C batteries. Through the rapid test of the internal resistance meter, the control platform automatically analyzes the judgment results.

Step 2 in this example includes:

The initial combination of Class A and Class B repairable single cells to form the initial battery pack;

Conduct charge and discharge tests on the initial battery pack to obtain the capacity of each repairable single battery;

Match the capacity of each repairable single battery with the preset capacity;

According to the matching results, the repairable single battery is classified into the first category, the second category or the third category;

The first category is the finished battery, the second category is the battery to be repaired, and the third category is excluded and not repaired.

category capacity range Remark the first sort More than 80% finished product second category 40%--80% repair third category 40% or less remove

Charge and discharge cycle system and DC charger are used for charge and discharge test. During the testing process, the tester wirelessly collects the voltage of each battery cell, matches the battery barcode, and sends the data to the background for record analysis. After the test is completed, the system platform immediately analyzes the status and classification level of each battery.

The handheld terminal can read the status level of each single battery in real time.

In this example step 4, the reserve of reorganizing the storage battery pack includes:

Let the reassembled battery packs be in the state of floating charging, and multiple sets are connected in parallel;

The standard reorganized batteries are composed of 220V system battery packs. If there are unmatched batteries left after reorganization, they can be divided into 48V systems for floating charging.

When the reorganization is completed and not put into use immediately, but as a backup replacement battery pack, it needs to maintain a healthy performance state at all times, in case the site battery fails and needs to be replaced urgently. use". The traditional storage battery management is only placed in the warehouse, in an open state, long-term power loss, and only recharged when needed, and often cannot be restored to a healthy state that meets the requirements. This scheme is designed to manage the floating charge of the stored battery, connect the stored spare battery pack to a high-performance DC charger, keep the battery pack in a floating charge state, and monitor the voltage and internal resistance of each monomer in real time, so as to grasp the performance of the battery state, it can realize multi-group parallel management. The internal resistance test of the battery is carried out on a regular basis in an automatic way, the data is automatically uploaded, and the status results are automatically analyzed. When an alarm occurs, the battery will be automatically prompted to form an automated management. If the battery pack is in the "storage and standby state" for a long time, the battery pack will be charged and discharged according to the maintenance and management method of the substation battery pack to maintain the active state of the battery pack.

Storage and discharge battery operation mode; normally in the state of floating charge, multiple groups are in parallel mode, based on the current site area, it is tentatively scheduled to support four groups of the same system in the state of floating charge as a reserve. The standard composition is a 220V system battery pack. If there are unsuitable batteries left after reorganization, it can be divided into a 48V system for floating charging.

Storage battery maintenance; monthly maintenance for routine maintenance, keep the battery clean and check the tightness of the connection bar,

Quarterly maintenance automatically conducts internal resistance tests through control, and can also set the test cycle to automatically test, automatically upload data, and automatically analyze the battery health status. Semi-annual maintenance passes 30% checking test, automatically uploads data, conducts battery health analysis, and annual maintenance passes 100% full capacity charge and discharge test, detects battery capacity, activates and maintains battery activity at the same time, automatically uploads and analyzes health status.

Charge and discharge test test control, arrange daily charge and discharge workload according to the workload of battery reorganization, and four or more groups can be carried out at the same time. The test start can be controlled manually or by platform communication, and the test is automatically tested according to the set parameters.

In this example, during the screening, reselection, repair and/or recombination steps, the cell voltage of each cell is obtained, and the cell voltage is transmitted to the control platform.

The physical terminal sensor can collect the monitored battery cell voltage, cell internal resistance, battery terminal voltage, and battery ambient temperature in real time (the temperature of each pole column can be considered in conjunction with cost), of which the cell voltage, cell internal resistance, and terminal voltage can be Draw historical curves and generate analysis charts in the background software. All historical curves can be saved for at least one year, and trend prediction alarms and telemetry value cross-limit alarms can be set.

The monitoring device is equipped with a backup power supply (battery) to ensure that the monitoring device can still complete the fault data recording function in a short time when the DC system loses voltage, which is convenient for accident analysis;

Considering the rapid deterioration of a single battery in the battery pack that needs to be removed, it can provide shielding and removal battery monitoring function settings when the entire battery pack lacks a few batteries, so as to ensure that the remaining batteries will not be affected by the removal of the battery while continuing to monitor, which is conducive to maintenance work. ;

It can monitor the charge and discharge current of the battery, draw the charge and discharge current curve and generate an analysis report to guide the analysis of the reconciliation charge and discharge test.

It can support the data access of the repair device and the capacity distribution group device, and realize the closed-loop supervision of the whole process and the whole cycle.

The above-mentioned preferred embodiments of the present invention are not intended to limit the present invention, and any modification made within the spirit and principles of the present invention, the improvement of the method equivalent to a kind of unqualified storage battery group recycling, etc. Should be included within the protection scope of the present invention.

Claims (1)

1. The method for recycling unqualified battery packs is characterized in that it comprises the following steps: Step 1. Screening: Fully charge each single battery of the unqualified battery pack, then obtain the internal resistance of each single battery, screen according to the internal resistance, and select a repairable single battery; Step 2. Reselection: Combine the repairable single cells for the first time to form the primary storage battery pack, conduct charge and discharge tests on the primary storage battery pack, obtain the capacity of each repairable single cell, screen according to the capacity, and select the one to be repaired Single battery; Step 3. Repair: Use high-frequency pulses to repair each single battery to be repaired; Step 4. Recombination: measure the capacity of the repaired single battery, and recombine according to the capacity to form a reorganized battery pack, which is put into use or stored; Before the step one, the following steps are also included: Identification: set label barcode or two-dimensional code on the unqualified battery, the wireless transmission terminal recognizes the label barcode or two-dimensional code, and transmits the identification signal corresponding to the unqualified battery to the control platform; In the steps of screening, reselecting, repairing and/or recombining, obtaining the cell voltage of each cell, and transmitting the cell voltage to the control platform; The third step is specifically: using a high-frequency pulse repair instrument to repair the single battery to be repaired, using 2-3 cycles, the charge and discharge current is gradually increased from the current of less than 10 hours to the current of 10 hours, and the discharge is set to complete After that, let it stand for a waiting time, let the single battery to be repaired cool down and start charging, the charging setting time is at least twice the discharge time, to ensure that the single battery to be repaired is fully charged; The standard for the initial combination in step 2 is: combine repairable single batteries with similar brands, nominal capacities, and years into a group; The step of fully charging each single battery of the unqualified battery pack described in the first step includes: Build at least one DC system; Connect at least four sets of normal battery packs in parallel under each DC system; Fully charge each single battery of the marked unqualified battery pack; In the first step, the step of obtaining the internal resistance of each single battery, screening according to the internal resistance, and selecting a repairable single battery includes: Using an internal resistance meter to measure the internal resistance of the single battery, the internal resistance meter transmits the internal resistance signal corresponding to the internal resistance of each single cell to the control platform; The control platform matches the internal resistance signal with the preset internal resistance; According to the matching results, each single battery is classified into Class A, Class B or Class C; Type A and B single cells are regarded as repairable single cells, and type C is excluded and cannot be repaired; The second step specifically includes: The initial combination of Class A and Class B repairable single cells to form the initial battery pack; Conduct charge and discharge tests on the initial battery pack to obtain the capacity of each repairable single battery; Match the capacity of each repairable single battery with the preset capacity; According to the matching results, the repairable single battery is classified into the first category, the second category or the third category; The first category is the finished battery, the second category is the battery to be repaired, and the third category is excluded and not repaired; In the fourth step, the principles of restructuring include: (1) Matching is carried out in single cells in the same circuit; (2) 0.1CA discharge capacity ≥ 100%; (3) After standing for 72 hours, the open circuit voltage of single cells is 220-223v/pc; (4) Standing After 72 hours, the open-circuit voltage difference of the single cells in the same group is ≤10mV; and (5) During the capacity detection discharge stage, at the termination point or measurement point, the discharge voltage difference of the single cells in the same group is ≤50mV; The reserve of recombining the accumulator group in the described step 4 includes: Let the reassembled battery packs be in the state of floating charging, and multiple sets are connected in parallel; The standard reorganized batteries are composed of 220V system battery packs. If there are unmatched batteries left after reorganization, they can be divided into 48V systems for floating charging.