CN115995628B

CN115995628B - Recovery processing method and device for retired lithium ion battery

Info

Publication number: CN115995628B
Application number: CN202310288403.XA
Authority: CN
Inventors: 郑伟鹏; 丁柏栋; 林晓杰; 杨昊昱; 张秋辉; 李芳�; 杨泽滨
Original assignee: Shenzhen Jiecheng Nickel Cobalt New Energy Technology Co ltd
Current assignee: Shenzhen Jiecheng Nickel Cobalt New Energy Technology Co ltd
Priority date: 2023-03-23
Filing date: 2023-03-23
Publication date: 2023-06-30
Anticipated expiration: 2043-03-23
Also published as: CN115995628A

Abstract

The invention relates to the technical field of new energy environment-friendly treatment, and discloses a recovery treatment method and device for retired lithium ion batteries, wherein the recovery treatment method comprises the following steps: extracting a first group of test lithium battery sets from the retired lithium ion battery sets, extracting a second group of test lithium battery sets from the retired lithium ion battery sets when the number of the test heat values of the first group of test lithium battery sets is larger than a specified heat value and smaller than or equal to a first number threshold, extracting a third group of test lithium battery sets from the retired lithium ion battery sets when the number of the dissolution rate of the second group of test lithium battery sets is larger than or equal to a second number threshold, calculating the voltage stability of each third group of test lithium batteries, and judging that the retired lithium ion battery sets have recoverability when the number of the third group of test electrolyte with the voltage stability larger than the specified stable value is larger than or equal to a third number threshold. The method mainly solves the problems of time and labor consumption in judging the recoverability of the retired lithium battery by the traditional method.

Description

Recovery processing method and device for retired lithium ion battery

Technical Field

The invention relates to a recycling method and device for retired lithium ion batteries, and belongs to the technical field of new energy environment-friendly treatment.

Background

The retired lithium ion battery refers to a lithium battery which needs to execute secondary utilization or destruction when reaching a specified service life or when the battery attenuation degree meets a specified attenuation threshold, wherein the retired lithium battery which can be used secondarily is also called a cascade utilization lithium battery, has recyclability, and the retired lithium battery which cannot reach secondary utilization needs to execute crushing destruction, so that the retired lithium battery has no recycling property. Because the retired lithium ion battery has a complex structure, the method for efficiently judging whether the retired lithium ion battery has recyclability has important significance.

The conventional method for judging the recoverability mainly depends on an electrolyte quality judging method, namely, an internal electrolyte is obtained by extruding the retired lithium battery through a mechanical crushing device, the component proportion of an organic solvent, lithium salt and an additive in the electrolyte is measured based on a chemical method, and whether the retired lithium battery electrolyte meets the gradient utilization condition or not is judged according to the component proportion, so that the recovery value of the retired lithium battery electrolyte is determined.

Although the method can realize the recovery judgment of the retired lithium ion battery, the technology of measuring the quality of the electrolyte by a chemical method is relatively complicated in implementation steps, and the proportion of each component of the electrolyte is required to be continuously measured by various chemical reagents, so that the method is time-consuming and labor-consuming, and therefore, an efficient and rapid recovery treatment method for the retired lithium ion battery is lacked.

Disclosure of Invention

The invention provides a recovery processing method and device for retired lithium ion batteries and a computer readable storage medium, and mainly aims to solve the problems of time and labor consumption caused by the fact that the recoverability of the traditional retired lithium ion batteries depends on a chemical method to measure the quality of electrolyte of the retired lithium ion batteries.

In order to achieve the above object, the present invention provides a recovery processing method for retired lithium ion battery, comprising:

obtaining a retired lithium ion battery set to be recycled, wherein all retired lithium ion batteries in the retired lithium ion battery set have the same use environment and the same battery specification before retired;

randomly extracting a first appointed number of retired lithium ion batteries from the retired lithium ion battery set to obtain a first group of test lithium battery set;

placing each first group of test lithium batteries in a pre-constructed heat test circuit in sequence, and starting the heat test circuit to calculate the test heat value of each first group of test lithium batteries;

calculating the quantity of the first group of test lithium batteries with the concentrated test heat quantity value larger than the specified heat quantity value;

when the number of the first group of test lithium batteries with the test heat value larger than the specified heat value is larger than a preset first number threshold value, judging that the retired lithium ion battery set does not have recoverability;

When the number of the first group of test lithium batteries with the test heat value larger than the specified heat value is smaller than or equal to a preset first number threshold value, randomly extracting a second specified number of retired lithium ion batteries from the retired lithium ion battery set to obtain a second group of test lithium battery set;

sequentially obtaining electrolyte of each second group of test lithium batteries in the second group of test lithium batteries to obtain a second group of test electrolyte set;

calculating the dissolution rate of each second group of test electrolyte in the second group of test electrolyte sets, and judging that the retired lithium ion battery set does not have recoverability when the number of the second group of test electrolytes with the dissolution rate larger than the specified rate value is smaller than a preset second number threshold value;

randomly extracting a third specified number of retired lithium ion batteries from the retired lithium ion battery set to obtain a third group of test lithium battery set when the number of the second group of test electrolytes with the dissolution rate larger than the specified rate value is larger than or equal to a preset second number threshold;

placing each third group of test lithium batteries in the third group of test lithium batteries in a pre-constructed voltage test circuit after the third group of test lithium batteries are fully charged in sequence, and starting the voltage test circuit to fit to obtain a road end voltage function of each third group of test lithium batteries;

Calculating the voltage stability of a corresponding third group of test lithium batteries according to each road end voltage function, and judging that the retired lithium ion battery set has no recoverability when the number of the third group of test electrolytes with the voltage stability larger than a designated stable value is smaller than a preset third number threshold value;

and when the number of the third group of test electrolytes with the voltage stability larger than the designated stable value is larger than or equal to a preset third number threshold value, judging that the retired lithium ion battery set has recoverability.

Optionally, the starting heat test circuit calculates a test heat value for each first set of test lithium batteries, including:

starting a power supply in the heat test circuit, wherein the first group of test lithium batteries are positioned in the heat test circuit, and the heat test circuit further comprises a protection resistor;

calculating a current value of a first group of test lithium batteries, wherein the current value is calculated by the following steps:

wherein, the liquid crystal display device comprises a liquid crystal display device,

represents the current value of the first group of test lithium batteries, < >>

Representing the voltage values of a first set of test lithium batteries, and (2)>

Representing the resistance values of a first set of test lithium batteries;

receiving the set heat calculation time, and obtaining the test heat value of each first group of test lithium batteries according to the following calculation:

a test heat value indicating a first set of test lithium batteries, ">

For calculating the set heatAnd (3) the room(s).

Optionally, the step of sequentially obtaining the electrolyte of each second group of test lithium batteries in the second group of test lithium batteries to obtain a second group of test electrolyte set includes:

and executing the following operation on each second group of test lithium batteries in the second group of test lithium batteries:

performing discharging operation on the second group of test lithium batteries to obtain a second group of empty lithium batteries;

performing liquid nitrogen freezing operation on the second group of empty lithium batteries to obtain a second group of frozen lithium batteries;

disassembling the second group of frozen lithium batteries to obtain a second group of lithium battery fragment sets;

stripping the second group of lithium battery fragment sets to obtain second group of solid electrolyte, and performing liquefaction operation on each second group of solid electrolyte to obtain a second group of test electrolyte;

and collecting the second group of test electrolyte corresponding to each second group of test lithium batteries to obtain a second group of test electrolyte set.

Optionally, the calculating the dissolution rate of each second set of test electrolytes in the second set of test electrolytes comprises:

obtaining an electrolyte solvent and a porous inert solid, wherein the electrolyte solvent comprises liquid carbon dioxide, and the porous inert solid is incompatible with both the electrolyte solvent and the test electrolyte;

Adding the electrolyte solvent and the porous inert solid into a closed container, measuring the initial concentration of a second group of test electrolyte, and after the initial time concentration is obtained, adding the second group of test electrolyte into the closed container to obtain the porous inert solid and mixed solution, wherein the mixed solution exists in a plurality of pore diameters of the porous inert solid;

measuring the concentration of the test electrolyte of the mixed solution in a plurality of apertures at intervals of a designated time period to obtain a plurality of groups of designated time concentrations;

and calculating to obtain the dissolution rate of the second group of test electrolyte according to the initial time concentration and the multiple groups of designated time concentrations.

Optionally, the calculating to obtain the dissolution rate of the second set of test electrolytes according to the initial time concentration and the multiple sets of specified time concentrations includes:

fitting the initial time concentration and a plurality of groups of designated time concentrations according to the time change to obtain a time concentration function taking time as an independent variable and changing the concentration into the dependent variable;

deriving the time concentration function to obtain a dissolution rate, wherein deriving comprises:

representing the time concentration function, +.>

For the time-varying values of the electrolyte solvent and the test electrolyte solution,

representing the initial time concentration,/- >

Fitting weight value representing a time concentration function, +.>

Indicating the dissolution rate of the second set of test electrolytes.

Optionally, the voltage test circuit uses the fully charged third group of test lithium batteries as a power supply, and the voltage test circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor, wherein the first resistor and the first capacitor are constructed in parallel to obtain a first parallel circuit, the second resistor and the second capacitor are constructed in parallel to obtain a second parallel circuit, and the first parallel circuit, the second parallel circuit and the third resistor are connected in series.

Optionally, the starting voltage test circuit fits to obtain a road end voltage function of each third group of test lithium batteries, including:

before starting a voltage test circuit, obtaining the open-circuit voltage of a third group of test lithium batteries;

when the open circuit voltage of the third group of test lithium batteries is successfully obtained, the voltage testing circuit is started, and then the voltages of the first parallel circuit and the second parallel circuit are measured at intervals of a specified time period, so that multiple groups of first parallel voltages and second parallel voltages corresponding to the specified time period are obtained;

and fitting according to the open-circuit voltage, the multiple groups of first parallel voltages and the multiple groups of second parallel voltages to obtain a circuit end voltage function of the third group of test lithium batteries.

Optionally, the fitting according to the open-circuit voltage, the plurality of sets of first parallel voltages and the second parallel voltages to obtain a circuit-end voltage function of the third set of test lithium batteries includes:

fitting according to each group of first parallel voltage and second parallel voltage to obtain a load current function of the voltage test circuit, wherein the fitting method of the load current function is as follows:

respectively constructing a first voltage guide function of the first parallel voltage and time and a second voltage guide function of the second parallel voltage and time according to a plurality of groups of first parallel voltages and second parallel voltages;

fitting respectively according to the first voltage guide function and the second voltage guide function to obtain a first load current function and a second load current function, wherein the load current function comprises a first load current function and a second load current function, and the first load current function and the second load current function are respectively as follows:

and->

Representing a first load current function and a second load current function, respectively,/->

Is indicated at +.>

First parallel voltage at time, +.>

Is indicated at +.>

Second parallel voltage at time, +.>

The resistance value of the first resistor is indicated,

representing the resistance value of the second resistor, +.>

Representing the capacitance value of the first capacitor, +. >

Representing the capacitance value of the second capacitor, +.>

Representing a first voltage derivative function, ">

Representing a second voltage derivative function;

and constructing a third group of circuit end voltage functions of the test lithium battery based on the open-circuit voltage, the first load current function and the second load current function.

Optionally, the rail-side voltage function is:

road end voltage function representing third group of test lithium batteriesCount (n)/(l)>

Testing the open circuit voltage of the lithium battery for the third group, < >>

Current value representing the third resistance, +.>

The resistance value of the third resistor is shown.

In order to solve the above problems, the present invention also provides a recovery processing device for retired lithium ion battery, the device comprising:

the test heat value calculation module is used for obtaining a retired lithium ion battery set to be recycled, wherein all retired lithium ion batteries in the retired lithium ion battery set have the same use environment and the same battery specification before retired, a first designated number of retired lithium ion batteries are randomly extracted from the retired lithium ion battery set to obtain a first group of test lithium battery set, each first group of test lithium batteries in the first group of test lithium battery set are sequentially placed in a pre-built heat test circuit, and the heat test circuit is started to calculate the test heat value of each first group of test lithium batteries;

The solution rate calculation module is used for calculating the quantity of the first group of test lithium batteries with the test heat value larger than the specified heat value in the first group of test lithium batteries, judging that the retired lithium ion battery set does not have recyclability when the quantity of the first group of test lithium batteries with the test heat value larger than the specified heat value is larger than a preset first quantity threshold value, randomly extracting the retired lithium ion batteries with the second specified quantity from the retired lithium ion battery set to obtain a second group of test lithium battery set, sequentially obtaining electrolyte of each second group of test lithium batteries in the second group of test lithium battery set to obtain a second group of test electrolyte set, calculating the dissolution rate of each second group of test electrolyte in the second group of test electrolyte set, and judging that the retired lithium ion battery set does not have recyclability when the quantity of the second group of test electrolyte with the dissolution rate larger than the specified rate value is smaller than a preset second quantity threshold value;

the road end voltage function construction module is used for randomly extracting a third appointed number of retired lithium ion batteries from the retired lithium ion battery set to obtain a third group of test lithium battery set when the number of the second group of test electrolyte with the dissolution rate larger than the appointed rate value is larger than or equal to a preset second number threshold value, placing each third group of test lithium batteries in the third group of test lithium battery set in a pre-constructed voltage test circuit after being fully charged in sequence, and starting the voltage test circuit to fit to obtain the road end voltage function of each third group of test lithium batteries;

The recyclable judgment module is used for calculating the voltage stability of the corresponding third group of test lithium batteries according to each road end voltage function, judging that the retired lithium ion battery set does not have recyclability when the number of the third group of test electrolyte with the voltage stability larger than the designated stable value is smaller than a preset third number threshold value, and judging that the retired lithium ion battery set has recyclability when the number of the third group of test electrolyte with the voltage stability larger than the designated stable value is larger than or equal to the preset third number threshold value.

In order to solve the above-mentioned problems, the present invention also provides an electronic apparatus including:

at least one processor; the method comprises the steps of,

a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to implement the retired lithium ion battery reclamation method described above.

In order to solve the above problems, the present invention further provides a computer readable storage medium, in which at least one instruction is stored, the at least one instruction being executed by a processor in an electronic device to implement the above method for recycling a retired lithium ion battery.

Compared with the problems in the prior art, the embodiment of the invention firstly randomly extracts the first designated number of the retired lithium ion batteries from the retired lithium ion battery set to obtain the first group of test lithium battery set, and the first standard of the recoverability of the retired lithium batteries is that the retired lithium batteries still have good temperature control in the charging process, and if the temperature of the retired lithium batteries is too high in the charging process, the risk of the retired lithium batteries is not obvious, so that the embodiment of the invention sequentially places each first group of test lithium batteries in the first group of test lithium battery set in a pre-constructed heat test circuit, starts the heat test circuit to calculate the test heat value of each first group of test lithium batteries, calculates the number of the first group of test lithium batteries with the test heat value of the first group of test lithium batteries being larger than the designated heat value, when the number of the first group of test lithium batteries with the test heat value larger than the specified heat value is larger than the preset first number threshold, judging that the retired lithium ion battery set does not have the recyclability, and judging that the recyclability of the retired lithium batteries can be directly judged through the temperature control performance of the retired lithium batteries when the charge is performed, compared with a method for judging the quality of the electrolyte directly utilized, the method is simpler and more efficient, further, when the number of the first group of test lithium batteries with the test heat value larger than the specified heat value is smaller than or equal to the preset first number threshold, randomly extracting the retired lithium ion batteries with the second specified number from the retired lithium ion battery set to obtain a second group of test lithium battery set, sequentially obtaining the electrolyte of each second group of test lithium batteries in the second group of test lithium battery set to obtain a second group of test electrolyte set, calculating the dissolution rate of each second group of test electrolyte in the second group of test electrolyte set, when the number of the second group of test electrolytes with the dissolution rate larger than the specified rate value is smaller than a preset second number threshold value, judging that the retired lithium ion battery set has no recyclability, compared with the traditional chemical method for measuring the mass of the electrolyte, the embodiment of the invention judges the proportion of each component of the electrolyte through the dissolution rate of the electrolyte in the chemical reagent, the judgment speed of the electrolyte quality is faster, the excessive time and manpower consumption are further avoided, and finally, when the number of the second set of test electrolytes having dissolution rates greater than the specified rate value is greater than or equal to a preset second number threshold, randomly extracting a third appointed number of retired lithium ion batteries from the retired lithium ion battery set to obtain a third group of test lithium battery set, sequentially fully charging each third group of test lithium batteries in the third group of test lithium battery set, then placing the third group of test lithium batteries in a pre-built voltage test circuit, and starting a voltage test circuit to fit to obtain a road end voltage function of each third group of test lithium batteries, calculating the voltage stability of the corresponding third group of test lithium batteries according to each road end voltage function, because the voltage stability can objectively reflect the performance of each retired lithium battery in the actual discharging process, has important measurement standard for the quality of the retired lithium battery, so the embodiment of the invention further measures the voltage stability of each retired lithium battery in a cyclic and gradual way, therefore, the recycling method, the device, the electronic equipment and the computer readable storage medium of the retired lithium ion battery provided by the invention, the method can solve the problems of time and labor consumption caused by the fact that the recoverability of the traditional retired lithium battery depends on the chemical method to measure the quality of the electrolyte of the retired lithium battery.

Drawings

Fig. 1 is a schematic flow chart of a recovery processing method of a retired lithium ion battery according to an embodiment of the invention;

FIG. 2 is a functional block diagram of a recycling device for retired lithium ion batteries according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an electronic device for implementing the recovery processing method of the retired lithium ion battery according to an embodiment of the present invention.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The embodiment of the application provides a recycling treatment method of retired lithium ion batteries. The execution main body of the recycling method of the retired lithium ion battery comprises, but is not limited to, at least one of a server, a terminal and the like which can be configured to execute the method provided by the embodiment of the application. In other words, the recycling method of the retired lithium ion battery may be performed by software or hardware installed in a terminal device or a server device. The service end includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, and the like.

Example 1:

referring to fig. 1, a flow chart of a recovery processing method of a retired lithium ion battery according to an embodiment of the invention is shown. In this embodiment, the recovery processing method of the retired lithium ion battery includes:

s1, obtaining a retired lithium ion battery set to be recycled, wherein all retired lithium ion batteries in the retired lithium ion battery set have the same use environment and the same battery specification before retired.

It can be explained that the decommissioned lithium ion battery set to be recovered is a lithium battery set that needs to be decommissioned in order to manually determine that the use limit has been reached in the current environment. But there are the following cases: the reason for decommissioning the lithium battery may simply be that the current use environment is not satisfied, and the decommissioning lithium battery may continue to be used if a relatively loose use environment is replaced, which is called as a gradient use of the decommissioning battery. However, in terms of replacement, if the risk of the retired lithium battery in the battery itself does not meet the gradient utilization condition, the scrapping process needs to be directly executed in general, that is, the recycling condition described in the embodiment of the present invention is not met. Therefore, a main purpose of the embodiment of the present invention is to perform the judgment of whether the retired lithium ion battery set to be recovered has recovery value.

For example, the small sheet is used as a battery inspector of the retired battery recycling factory, and it is required to detect whether the current set of lithium ion batteries retired from the new energy automobile factory has recyclability, and it is emphasized that in order to improve the accuracy of judging the recyclability of the retired lithium ion battery set, all the retired lithium ion batteries have the same use environment and the same battery specification before being retired. Such as lithium ion battery packs retired from new energy automobile factories, wherein each lithium battery is used to test the quality of new energy automobiles in the new energy automobile factories, thus having the same test environment, and each lithium battery has the same model.

S2, randomly extracting a first appointed number of retired lithium ion batteries from the retired lithium ion battery set to obtain a first group of test lithium battery set.

The embodiment of the invention totally divides the recyclability test of the retired lithium ion battery set to be recycled into 3 steps, wherein the 1 st step test mainly tests the heat value generated by the retired lithium ion battery in the circuit, and when the heat value generated by the retired battery in the circuit is too high, the safety risk of the retired battery is shown. Thus, a first specified number of retired lithium-ion batteries is first randomly extracted from the set of retired lithium-ion batteries, which typically requires a reference number of retired lithium-ion batteries, in principle not less than 20% of the number of retired lithium-ion battery sets. Illustratively, if the retired lithium ion battery set of the new energy automobile factory is 100, at least 20 retired lithium ion batteries are extracted as the first set of test lithium battery sets.

S3, placing each first group of test lithium batteries in the first group of test lithium batteries in a pre-built heat test circuit in sequence, and starting the heat test circuit to calculate the test heat value of each first group of test lithium batteries.

It should be explained that the main purpose of the heat test circuit is to test the heat value generated by each lithium battery in a specified time, and in detail, the start heat test circuit calculates the test heat value of each first group of test lithium batteries, including:

represents the current value of the first group of test lithium batteries, < >>

Representing the resistance values of a first set of test lithium batteries;

a test heat value indicating a first set of test lithium batteries, ">

The time is calculated for the set heat.

It can be appreciated that when the test heat value calculation method is used, the test heat value of each first group of test lithium batteries in the first group of test lithium battery set can be calculated in sequence.

S4, calculating the quantity of the first group of test lithium batteries with the concentrated test heat quantity value larger than the specified heat quantity value.

And S5, when the number of the first group of test lithium batteries with the test heat value larger than the specified heat value is larger than a preset first number threshold, judging that the retired lithium ion battery set does not have recyclability.

For example, a total of 20 first group test lithium batteries in the first group test lithium battery set, the specified heat value is 100J, and a total of 15 first group test lithium batteries with the test heat value greater than the specified heat value are calculated by the test heat value calculation method. The preset first quantity threshold value is 10, and as 15 is obviously larger than 10, the risk that the retired lithium ion battery set to be recycled has too large charge heat release can be inferred through the instability of the temperature of the lithium battery during the charging process of the first group of test lithium battery sets, so that the retired lithium ion battery set is directly judged to be not recyclable.

S6, randomly extracting a second specified number of retired lithium ion batteries from the retired lithium ion battery set when the number of the first group of test lithium batteries with the test heat value larger than the specified heat value is smaller than or equal to a preset first number threshold value, so as to obtain a second group of test lithium battery set.

For example, a total of 20 first group of test lithium batteries in the first group of test lithium battery set are calculated by the test heat value calculation method to obtain only 2 first group of test lithium batteries with the test heat value larger than the specified heat value, which indicates that the retired lithium ion battery set to be recycled is qualified for controlling the charged heat generally, so that the next step is to further judge whether the electrolyte of the retired battery meets the recycling requirement. So, again, the embodiment of the present invention randomly extracts a second specified number of retired lithium-ion batteries from the retired lithium-ion battery cell set, wherein the second specified number is in principle not greater than 5% of the number of retired lithium-ion battery cell sets, and it should be explained that, since each second set of test lithium-ion batteries in the second set of test lithium-ion batteries needs to perform a crushing operation, in principle the second specified number should not be too high, and generally only 2% -5% of the scale number of retired lithium-ion battery cell sets is randomly extracted as the second set of test lithium-ion battery cell sets.

And S7, sequentially obtaining the electrolyte of each second group of test lithium batteries in the second group of test lithium batteries to obtain a second group of test electrolyte set.

In detail, the step of sequentially obtaining the electrolyte of each second group of test lithium batteries in the second group of test lithium batteries to obtain a second group of test electrolyte set includes:

It should be explained that the electrolyte is generally stored inside the retired lithium battery, so how to safely obtain the electrolyte of the retired lithium battery in the recycling stage and further evaluate whether the electrolyte meets the recycling requirement is the core of step 2 of the embodiment of the present invention. In order to prevent the danger of explosion when the electrolyte is obtained due to the fact that a large amount of electric energy exists in the retired lithium battery, the embodiment of the invention firstly performs discharging operation on the retired lithium battery, and in addition, in order to prevent the electrolyte from being wasted, the embodiment of the invention performs liquid nitrogen freezing to change the electrolyte from a liquid state to a solid state, so that the electrolyte of the second group of test lithium batteries is obtained to the greatest extent.

S8, calculating the dissolution rate of each second group of test electrolyte in the second group of test electrolyte sets, and judging that the retired lithium ion battery set is not recyclable when the number of the second group of test electrolytes with the dissolution rate larger than the specified rate value is smaller than a preset second number threshold value.

It should be explained that the content of the organic liquid soluble in the electrolyte solvent in the retired lithium ion battery is greatly reduced compared with that of the normal lithium ion battery, and the content of the organic liquid in the retired lithium ion battery is only 50% -70% of that in the normal lithium ion battery. However, even if the content of the organic liquid is only 50% -70% of that of a normal lithium ion battery, the retired lithium ion battery can still be used as a gradient battery for secondary use, but if the content of the organic liquid is less than 50% of that of the normal lithium ion battery, the value of gradient use of the retired lithium ion battery is not high in consideration of the safety principle, namely the reclaim value is not high, and the retired lithium ion battery is generally and directly destroyed. And further, the higher the organic liquid content is, the higher the dissolution rate corresponding to the organic liquid content is, so it can be understood that, in order to determine the content and activity degree of the organic liquid in the retired lithium ion battery, the embodiment of the invention constructs the dissolution rate, which mainly indicates the concentration change degree after the electrolyte solvent and the test electrolyte are mixed with each other, if the activity and content of the organic liquid in the electrolyte solvent in the retired lithium ion battery are higher, the corresponding dissolution rate is also relatively higher, and the dissolution rate can be only reflected by the mixing time and the concentration change, so that the basis for determining whether the retired lithium ion battery has recovery value or not is achieved, so that the embodiment of the invention determines the dissolution rate of each second group of test electrolyte, thereby determining the overall health level of the electrolyte of the retired lithium ion battery set.

In detail, the calculating the dissolution rate of each second group of test electrolytes in the second group of test electrolytes includes:

It should be explained that the main function of the porous inert solid is to effectively divide a plurality of dissolution spaces, wherein each aperture is a dissolution space, and a space in which the electrolyte solvent and the test electrolyte are mutually fused is created in each aperture, so that the phenomenon of coordinated operation of the electrolyte in actual operation of the lithium battery can be effectively simulated, and the accuracy of measuring the quality of the electrolyte is improved.

Further, the calculating to obtain the dissolution rate of the second set of test electrolytes according to the initial time concentration and the multiple sets of designated time concentrations includes:

representing the time concentration function, +.>

representing the initial time concentration,/->

Fitting weight value representing a time concentration function, +.>

Indicating the dissolution rate of the second set of test electrolytes.

It will be appreciated that embodiments of the present invention sequentially measure the dissolution rate of each of the second set of test electrolytes in the second set of test electrolytes and count the number of second sets of test electrolytes having dissolution rates greater than the specified rate value. For example, assuming that the second set of test electrolytes has a total of 5 second sets of test electrolytes, statistics first finds that only 1 second set of test electrolytes has a dissolution rate greater than a specified rate value, and assuming that at least 4 second sets of test electrolytes are required to have a dissolution rate greater than the specified rate value, the corresponding determination is made that the retired lithium ion battery set is not recyclable due to a number of second set of test electrolytes less than a preset second number threshold value 4.

And S9, randomly extracting a third specified number of retired lithium ion batteries from the retired lithium ion battery set when the number of the second group of test electrolytes with the dissolution rate larger than the specified rate value is larger than or equal to a preset second number threshold value, so as to obtain a third group of test lithium battery set.

For example, statistics show that the dissolution rate of the 5 second group of test electrolytes is greater than the specified rate value, and the value of the second number threshold is 4, so that the quality requirement of the electrolytes is met, and whether the retired lithium ion battery set has recyclability needs to be further determined. According to the above, the test of the recoverability of the retired lithium ion battery set to be recovered is divided into 3 steps, wherein the heat value generated by the 1 st step of test battery in the circuit and the electrolyte quality of the 2 nd step of test battery are tested, and when the heat value and the electrolyte quality meet the requirements, the voltage stability of the retired battery is measured in the 3 rd step.

Similar to the previous steps, a third specified number of retired lithium ion batteries are still randomly extracted from the retired lithium ion battery set to obtain a third group of test lithium battery sets, wherein the third group of test lithium battery sets are all used for testing voltage stability, and the third specified number needs to refer to the number of the retired lithium ion battery sets and is not less than 20% of the number of the retired lithium ion battery sets in principle.

And S10, placing each third group of test lithium batteries in the third group of test lithium batteries in a pre-constructed voltage test circuit after the third group of test lithium batteries are fully charged in sequence, and starting the voltage test circuit to fit to obtain a road end voltage function of each third group of test lithium batteries.

It should be explained that the main purpose of fully charging each third group of test lithium batteries is to use each fully charged third group of test lithium batteries as a power source of the voltage test circuit and test the voltage stability of the third group of test lithium batteries as the power source provided to the voltage test circuit.

In detail, the voltage test circuit takes a third group of fully charged lithium batteries as a power supply, and comprises a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor, wherein the first resistor and the first capacitor are connected in parallel to form a first parallel circuit, the second resistor and the second capacitor are connected in parallel to form a second parallel circuit, and the first parallel circuit, the second parallel circuit and the third resistor are connected in series.

It can be understood that the voltage testing circuit according to the embodiment of the present invention is mainly aimed at testing the voltage stability of the third group of test lithium batteries when the third group of test lithium batteries are used as power sources to supply the first resistor, the second resistor, the third resistor, the first capacitor and the second capacitor with electric energy. Further, the starting voltage test circuit fits to obtain a road end voltage function of each third group of test lithium batteries, including:

If the open circuit voltage of the third group of test lithium batteries cannot be obtained before the voltage test circuit is started, the corresponding third group of test lithium batteries cannot store electricity after being charged, so that the corresponding third group of test lithium batteries are directly judged to have no recoverability.

Further, the fitting of the open-circuit voltage, the plurality of groups of first parallel voltages and the second parallel voltages to obtain a third group of circuit-end voltage functions of the test lithium battery includes:

and->

Is indicated at +.>

First parallel voltage at time, +.>

Is indicated at +.>

Second parallel voltage at time, +.>

The resistance value of the first resistor is indicated,

representing the resistance value of the second resistor，/>

Representing the capacitance value of the first capacitor, +.>

Representing the capacitance value of the second capacitor, +.>

Representing a first voltage derivative function, ">

Representing a second voltage derivative function;

According to the above description, the embodiment of the invention can obtain the load current variation process of the first parallel connection and the second parallel connection along with the time variation, namely the first load current function and the second load current function, by measuring the multiple groups of the first parallel voltage and the second parallel voltage and finally fitting.

Further, the road-side voltage function is:

represents the rail-side voltage function of the third group of test lithium batteries, ">

Current value representing the third resistance, +.>

The resistance value of the third resistor is shown.

And S11, calculating the voltage stability of the corresponding third group of test lithium batteries according to the voltage function of each road end, and judging that the retired lithium ion battery set has no recyclability when the number of the third group of test electrolyte with the voltage stability larger than the designated stable value is smaller than a preset third number threshold value.

It can be understood that step S10 calculates a terminal voltage function of each third group of test lithium batteries, where the terminal voltage function represents a time-varying condition of the terminal voltage of the third group of test lithium batteries. It should be explained that, the method for calculating the voltage stability by using the road end voltage function is various, for example, the road end voltage function can be solved for time to obtain the road end voltage derivative function, the voltage stability of the tested lithium battery is determined by the size of the road end voltage derivative function, if the road end voltage derivative function is greater than the preset road end voltage derivative threshold, the condition that the voltage of the third group of tested lithium batteries suddenly increases or decreases is indicated, so the voltage stability is poor.

And S12, when the number of the third group of test electrolytes with the voltage stability larger than the designated stable value is larger than or equal to a preset third number threshold value, judging that the retired lithium ion battery set has recoverability.

It can be understood that the third number threshold and the designated stable value can be preset to determine the values thereof, and the relationship between the number of the third group of test lithium batteries with high voltage stability in the third group of test lithium batteries and the third number threshold is used to infer the stability of the voltage output of each retired lithium ion battery in the retired lithium ion battery set, thereby finally achieving the purpose of judging whether the retired lithium ion battery set has recyclability or not.

Example 2:

fig. 2 is a functional block diagram of a recycling device for retired lithium ion batteries according to an embodiment of the present invention.

The recovery processing device 100 of the retired lithium ion battery can be installed in electronic equipment. According to the functions, the recovery processing device 100 of the retired lithium ion battery may include a test heat value calculation module 101, a dissolution rate calculation module 102, a road end voltage function construction module 103, and a recoverable judging module 104. The module of the invention, which may also be referred to as a unit, refers to a series of computer program segments, which are stored in the memory of the electronic device, capable of being executed by the processor of the electronic device and of performing a fixed function.

The test heat value calculation module 101 is configured to obtain a retired lithium ion battery set to be recycled, where all retired lithium ion batteries in the retired lithium ion battery set have the same use environment and the same battery specification before retired, randomly extract a first specified number of retired lithium ion batteries from the retired lithium ion battery set to obtain a first group of test lithium battery sets, sequentially placing each first group of test lithium batteries in the first group of test lithium battery sets in a pre-constructed heat test circuit, and starting the heat test circuit to calculate a test heat value of each first group of test lithium batteries;

The dissolution rate calculation module 102 is configured to calculate the number of first test lithium batteries with a first set of test heat values greater than a specified heat value, determine that the retired lithium ion battery set is not recyclable when the number of the first test lithium batteries with the test heat values greater than the specified heat value is greater than a preset first number threshold, randomly extract a second specified number of retired lithium ion batteries from the retired lithium ion battery set when the number of the first test lithium batteries with the test heat values greater than the specified heat value is less than or equal to the preset first number threshold, obtain a second set of test lithium battery sets, sequentially obtain electrolyte solutions of each second test lithium battery in the second set of test lithium battery sets, obtain a second set of test electrolyte sets, calculate the dissolution rate of each second test electrolyte in the second set of test electrolyte sets, and determine that the retired lithium ion battery set is not recyclable when the number of the second test electrolyte solutions with the dissolution rate greater than the specified rate value is less than the preset second number threshold;

the road end voltage function construction module 103 is configured to randomly extract a third specified number of retired lithium ion batteries from the retired lithium ion battery set to obtain a third set of test lithium battery sets when the number of the second set of test electrolytes with dissolution rates greater than the specified rate value is greater than or equal to a preset second number threshold value, place each third set of test lithium batteries in the third set of test lithium battery sets in a pre-constructed voltage test circuit after being fully charged in sequence, and start the voltage test circuit to fit to obtain a road end voltage function of each third set of test lithium batteries;

The recoverable judging module 104 is configured to calculate voltage stability of the corresponding third group of test lithium batteries according to each road end voltage function, determine that the retired lithium ion battery set is not recoverable when the number of the third group of test electrolytes with voltage stability greater than the specified stable value is less than a preset third number threshold, and determine that the retired lithium ion battery set is recoverable when the number of the third group of test electrolytes with voltage stability greater than the specified stable value is greater than or equal to the preset third number threshold.

In detail, the modules in the recovery processing device 100 for retired lithium ion batteries in the embodiment of the present invention use the same technical means as the recovery processing method for retired lithium ion batteries described in fig. 1, and can produce the same technical effects, which are not described herein.

Example 3:

fig. 3 is a schematic structural diagram of an electronic device for implementing a method for recycling a retired lithium ion battery according to an embodiment of the invention.

The electronic device 1 may comprise a processor 10, a memory 11, a bus 12 and a communication interface 13, and may further comprise a computer program stored in the memory 11 and executable on the processor 10, such as a recycling process program of retired lithium ion batteries.

The memory 11 includes at least one type of readable storage medium, including flash memory, a mobile hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc. The memory 11 may in some embodiments be an internal storage unit of the electronic device 1, such as a removable hard disk of the electronic device 1. The memory 11 may in other embodiments also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the electronic device 1. Further, the memory 11 may also include both an internal storage unit and an external storage device of the electronic device 1. The memory 11 may be used not only for storing application software installed in the electronic device 1 and various types of data, such as codes of recycling processes of retired lithium ion batteries, but also for temporarily storing data that has been output or is to be output.

The processor 10 may be comprised of integrated circuits in some embodiments, for example, a single packaged integrated circuit, or may be comprised of multiple integrated circuits packaged with the same or different functions, including one or more central processing units (Central Processing unit, CPU), microprocessors, digital processing chips, graphics processors, combinations of various control chips, and the like. The processor 10 is a Control Unit (Control Unit) of the electronic device, connects respective parts of the entire electronic device using various interfaces and lines, executes various functions of the electronic device 1 and processes data by running or executing programs or modules (e.g., a recycling process program of a retired lithium ion battery, etc.) stored in the memory 11, and calling data stored in the memory 11.

The bus may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The bus may be classified as an address bus, a data bus, a control bus, etc. The bus is arranged to enable a connection communication between the memory 11 and at least one processor 10 etc.

Fig. 3 shows only an electronic device with components, it being understood by a person skilled in the art that the structure shown in fig. 3 does not constitute a limitation of the electronic device 1, and may comprise fewer or more components than shown, or may combine certain components, or may be arranged in different components.

For example, although not shown, the electronic device 1 may further include a power source (such as a battery) for supplying power to each component, and preferably, the power source may be logically connected to the at least one processor 10 through a power management device, so that functions of charge management, discharge management, power consumption management, and the like are implemented through the power management device. The power supply may also include one or more of any of a direct current or alternating current power supply, recharging device, power failure detection circuit, power converter or inverter, power status indicator, etc. The electronic device 1 may further include various sensors, bluetooth modules, wi-Fi modules, etc., which will not be described herein.

Further, the electronic device 1 may also comprise a network interface, optionally the network interface may comprise a wired interface and/or a wireless interface (e.g. WI-FI interface, bluetooth interface, etc.), typically used for establishing a communication connection between the electronic device 1 and other electronic devices.

The electronic device 1 may optionally further comprise a user interface, which may be a Display, an input unit, such as a Keyboard (Keyboard), or a standard wired interface, a wireless interface. Alternatively, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like. The display may also be referred to as a display screen or display unit, as appropriate, for displaying information processed in the electronic device 1 and for displaying a visual user interface.

It should be understood that the embodiments described are for illustrative purposes only and are not limited to this configuration in the scope of the patent application.

The recycling process program of the retired lithium ion battery stored in the memory 11 of the electronic device 1 is a combination of a plurality of instructions, and when running in the processor 10, it can be implemented:

Specifically, the specific implementation method of the above instruction by the processor 10 may refer to descriptions of related steps in the corresponding embodiments of fig. 1 to 2, which are not repeated herein.

Further, the modules/units integrated in the electronic device 1 may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as separate products. The computer readable storage medium may be volatile or nonvolatile. For example, the computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM).

The present invention also provides a computer readable storage medium storing a computer program which, when executed by a processor of an electronic device, can implement:

The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units can be realized in a form of hardware or a form of hardware and a form of software functional modules.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. The recovery processing method of the retired lithium ion battery is characterized by comprising the following steps:

2. The recycling method of retired lithium-ion battery according to claim 1, wherein the starting heat test circuit calculates a test heat value for each first group of test lithium-ion batteries, comprising:

represents the current value of the first group of test lithium batteries, < >>

Representing the resistance values of a first set of test lithium batteries;

a test heat value indicating a first set of test lithium batteries, ">

The time is calculated for the set heat.

3. The method for recycling the retired lithium-ion battery according to claim 2, wherein the sequentially obtaining the electrolyte of each second group of test lithium batteries in the second group of test lithium batteries to obtain the second group of test electrolyte sets includes:

4. A method of recycling retired lithium-ion battery according to claim 3, wherein calculating the dissolution rate of each second set of test electrolytes in the second set of test electrolytes comprises:

5. The method for recycling a retired lithium-ion battery according to claim 4, wherein the calculating the dissolution rate of the second set of test electrolytes according to the initial time concentration and the plurality of sets of designated time concentrations includes:

representing the time concentration function, +.>

Time-varying values for electrolyte solvent and test electrolyte solution, +.>

Representing the initial time concentration,/->

Fitting weight value representing a time concentration function, +.>

Indicating the dissolution rate of the second set of test electrolytes.

6. The recycling method of retired lithium ion batteries according to claim 5, wherein the voltage testing circuit uses a third group of fully charged lithium ion batteries as a power supply, the voltage testing circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor, wherein the first resistor and the first capacitor are connected in parallel to form a first parallel circuit, the second resistor and the second capacitor are connected in parallel to form a second parallel circuit, and the first parallel circuit, the second parallel circuit and the third resistor are connected in series.

7. The method for recycling retired lithium-ion battery according to claim 6, wherein the starting voltage test circuit fits a circuit-side voltage function of each third group of test lithium-ion batteries, comprising:

8. The method for recycling retired lithium-ion battery according to claim 7, wherein the fitting the open-circuit voltage, the plurality of sets of first parallel voltages and the second parallel voltages to obtain the circuit-side voltage function of the third set of test lithium-ion batteries comprises: