CN115986255B

CN115986255B - Method and device for recycling negative electrode material of retired lithium ion battery

Info

Publication number: CN115986255B
Application number: CN202310288401.0A
Authority: CN
Inventors: 郑伟鹏; 丁柏栋; 李艳芹
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: CN115986255A

Abstract

The invention relates to the technical field of new energy environment-friendly treatment, and discloses a method and a device for recycling negative electrode materials of retired lithium ion batteries, which are used for obtaining discharged electric energy and empty energy lithium battery sets, transmitting the discharged electric energy back to an intelligent energy storage module to obtain stored electric energy, crushing and separating the empty energy lithium battery sets in a crushing module to obtain crushed lithium fragment sets, performing high-temperature calcination on the crushed lithium fragment sets by using a calcination module to obtain hybrid graphite powder sets, and placing the hybrid graphite powder sets into the graphite battery negative electrode material recycling method and the device, wherein the method comprises the following steps of: the method comprises the steps of starting a negative electrode material recoverer comprising an intelligent energy storage module, a discharging module, a crushing module, a calcining module and a graphite refining module, placing a retired lithium battery in the discharging module, and starting an electric energy refining module for receiving electric energy emitted by the retired lithium battery to perform refining to obtain refined graphite powder. The invention mainly solves the problem of electric energy resource waste caused by recycling the negative electrode material of the retired lithium battery.

Description

Method and device for recycling negative electrode material of retired lithium ion battery

Technical Field

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

Background

The lithium ion battery mainly comprises a positive electrode material, a negative electrode material and electrolyte, wherein the core of the negative electrode material is graphite. The retired lithium ion battery is a lithium battery which reaches a specified service life or the attenuation degree of the battery meets a specified attenuation threshold value and needs to be utilized or destroyed in a gradient way, wherein the retired lithium ion battery which needs to be crushed and destroyed comprises available graphite, so that the retired lithium ion battery is crushed and destroyed, and meanwhile, negative electrode materials such as graphite and the like are recovered.

The existing method for recycling the negative electrode material of the retired lithium ion battery mainly depends on a physical and chemical method, namely crushing fragments are obtained by extruding the retired lithium ion battery through a mechanical crushing device, and graphite negative electrode material is obtained by separating the crushing fragments through a separator.

Although the above-mentioned physicochemical method can realize the recovery of the negative electrode material of the retired lithium ion battery, since the graphite recovery involves various operation procedures, especially the starting of various mechanical crushing devices, separators, etc. which can only operate based on electric energy is extremely easy to cause the phenomenon of electric energy resource waste when the negative electrode material is recovered.

Disclosure of Invention

The invention provides a method and a device for recycling negative electrode materials of retired lithium ion batteries and a computer readable storage medium, and mainly aims to solve the problem of electric energy resource waste caused by recycling the negative electrode materials of the retired lithium ion batteries by a traditional physicochemical method.

In order to achieve the above object, the present invention provides a method for recovering a negative electrode material of a retired lithium ion battery, comprising:

obtaining a retired lithium battery set, and performing specification classification on the retired lithium battery set to obtain a plurality of groups of retired lithium batteries with different specifications;

starting a pre-constructed negative electrode material recoverer, wherein the negative electrode material recoverer comprises an intelligent energy storage module, a discharging module, a crushing module, a calcining module and a graphite refining module, and the electric energy of the intelligent energy storage module is derived from the discharging module;

placing a plurality of groups of retired lithium batteries with different specifications into a plurality of groups of battery placing grooves in the discharging module, wherein each group of battery placing grooves is used for placing retired lithium batteries with the same specification;

starting the discharging module, and receiving electric energy emitted by the retired lithium batteries in each group of battery placing grooves to obtain emitted electric energy and an empty energy lithium battery set;

the discharged electric energy is returned to the intelligent energy storage module for storage, so that stored electric energy is obtained;

performing crushing and separating operation on the empty energy lithium battery set in the crushing module to obtain a crushed lithium fragment set, wherein the electric energy supplied by the crushing and separating operation is preferably selected from the stored electric energy until the voltage of the stored electric energy does not meet the voltage requirement of the crushing and separating operation, and acquiring the electric energy supplied by the crushing and separating operation from a power grid;

Performing high-temperature calcination on the broken lithium fragment set by utilizing the calcination module to obtain a hybrid graphite powder set;

and placing the mixed graphite powder set into a graphite refining module to perform graphite refining to obtain refined graphite powder, wherein the electric energy supplied by the calcining module and the graphite refining module is selected to be the same as that supplied by the crushing module, and the recovery of the negative electrode material of the retired lithium ion battery is completed.

Optionally, the discharging module is composed of a plurality of groups of battery placing grooves, a plurality of groups of discharging circuits and a plurality of groups of discharging circuits, wherein the number of the battery placing grooves is the same as that of the discharging circuits, the discharging circuits and the discharging circuits are connected through intelligent switches, when the intelligent switches are closed, the battery placing grooves are connected with the discharging circuits, when the intelligent switches are opened, the battery placing grooves are connected with the discharging circuits, each group of battery placing grooves are used as power supplies of the corresponding discharging circuits and the discharging circuits, the discharging circuits comprise protection resistors and capacitors, the capacitors are used for storing discharging electric energy discharged by the battery placing grooves, and the discharging circuits comprise consumption resistors;

the start the module that discharges, receive the electric energy that the retired lithium cell of every group battery standing groove released, obtain and release electric energy and empty can lithium cell collection, include:

Judging the magnitude relation between the voltage value and the voltage threshold value of the retired lithium batteries in each group of battery placing grooves, and when the voltage value of the retired lithium batteries in the battery placing grooves is larger than the voltage threshold value, adjusting the intelligent switch to be in a closed state so that the battery placing grooves are connected with a discharging circuit;

collecting the released electric energy of the retired lithium battery by using a capacitor of a discharging circuit to obtain the released electric energy;

and when the voltage value of the retired lithium battery in the battery placing groove is smaller than or equal to the voltage threshold value, the intelligent switch is adjusted to be in an open-close state, so that the battery placing groove is connected with the emptying circuit until the electric energy of the retired lithium battery in the battery placing groove is consumed by using a consumption resistor in the emptying circuit, and the empty energy lithium battery set is obtained.

Optionally, the placing the multiple groups of retired lithium batteries with different specifications in multiple groups of battery placing grooves in the discharging module comprises:

counting the total number of specifications of a plurality of groups of retired lithium batteries with different specifications, and selecting the same number of battery placing grooves from a discharging module according to the total number of the specifications;

and (3) placing the retired lithium batteries of the same specification in the same battery placing groove in series until all the retired lithium batteries of the same specification are placed in different battery placing grooves.

Optionally, the step of returning the discharged electric energy to the intelligent energy storage module to perform storage to obtain stored electric energy includes:

starting each capacitor in the discharging module;

the discharging electric energy stored by each capacitor is sequentially led into an energy storage pool of the intelligent energy storage module to obtain stored electric energy, wherein the calculation formula of the stored electric energy is as follows:

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

indicating stored power,/->

Indicate->

The discharging electric energy stored by the capacitors is led into the intelligent energy storage module with the leading-in efficiency, < + >>

Indicate->

Discharging electric energy stored in the individual capacitors, +.>

Representing the total number of capacitors storing the discharged electric energy discharged by the retired lithium battery set,/for>

Indicating the service life of the energy storage poolIs>

The service life of the energy storage pool of the intelligent energy storage module is prolonged.

Optionally, the step of performing a crushing and separating operation on the empty lithium battery set in the crushing module to obtain a crushed lithium fragment set includes:

calculating electric energy required by executing crushing and separating operation in the crushing module according to the empty energy lithium battery set to obtain required electric energy;

when the required electric energy is greater than or equal to the stored electric energy, testing whether the electric energy supply between the crushing module and the power grid is normal, and when the electric energy supply between the crushing module and the power grid is abnormal, generating a power grid electric energy acquisition abnormality reminding instruction while suspending the crushing and separating operation, and sending the power grid electric energy acquisition abnormality reminding instruction to maintenance personnel of the negative electrode material recoverer;

When the electric energy supply between the crushing module and the power grid is normal, the empty energy lithium battery set is directly put into the crushing module, and the crushing module is started to execute crushing and separating operation, so that a crushed lithium fragment set is obtained.

Optionally, the calculating the electric energy required by the crushing and separating operation in the crushing module according to the empty energy lithium battery set to obtain the required electric energy includes:

obtaining the number of batteries of the retired lithium batteries of each specification, and the mass, the volume and the battery density of the retired lithium batteries of each specification;

according to the quantity, the quality, the volume and the battery density of the batteries, the crushing electric energy required by the crushing module to crush and separate the retired lithium batteries of each specification is calculated, wherein the crushing module consists of an extrusion plate and a separator;

and adding the crushing electric energy corresponding to the retired lithium batteries with different specifications to obtain the required electric energy.

Optionally, according to the number, the quality, the volume and the density of the batteries, the crushing electric energy required by the crushing module to crush and separate the retired lithium batteries of each specification is calculated, wherein the crushing module is composed of a squeezing plate and a separator, and comprises:

calculating the extrusion running length of the extrusion plate from the beginning of extrusion of the retired lithium battery to the completion of extrusion according to the volume of the retired lithium battery;

And calculating extrusion electric energy required by the extrusion plate based on the extrusion running length and the battery density, wherein the extrusion electric energy calculating method comprises the following steps of:

indicating the required extrusion power of the extrusion plate, +.>

For calculating the weighting factor of the extruded electrical energy, +.>

Representing the unit extrusion power required per extrusion unit volume of the extrusion plate per retired lithium battery, < >>

For the volume of the retired lithium battery, +.>

The density of the retired lithium battery;

calculating the separation electric energy required by the separator based on the mass, wherein the separation electric energy is calculated by the following method:

represents the separation power required by the separator, +.>

To calculate the separation of electric energyWeight factor->

Representing the unit separation power required per unit volume of separator per retired lithium battery, < >>

The quality of the retired lithium battery;

adding the extrusion electric energy and the separation electric energy to obtain the crushing electric energy required by the crushing module to crush and separate the retired lithium batteries of each specification.

Optionally, the high-temperature calcination is performed on the broken lithium chip set by using the calcination module to obtain a hybrid graphite powder set, which comprises:

placing the crushed lithium fragment set in a first calcining groove of a calcining module, and adding subcritical carbon dioxide and acetonitrile solvent into the first calcining groove;

Heating the first calcination tank to a first set temperature, and maintaining the first calcination tank at the first set temperature for a specified first time period to obtain a calcined lithium fragment set;

transferring the calcined lithium fragment set of the first calcining tank into a second calcining tank of the calcining module, adding a metal solvent into the second calcining tank, heating the second calcining tank to a second set temperature, wherein the second set temperature is higher than the first set temperature, and maintaining the second calcining tank for a specified second time period to obtain the hybrid graphite powder set.

Optionally, the step of placing the hybrid graphite powder set into a graphite refining module to perform graphite refining to obtain refined graphite powder includes:

adding dimethyl carbonate into a graphite refining module comprising a hybrid graphite powder set, wherein the graphite refining module comprises an oscillator;

after setting the oscillation frequency of an oscillator, starting the oscillator to oscillate a hybrid graphite powder set comprising dimethyl carbonate until the oscillation time reaches a specified third duration to obtain a primary graphite powder set;

adding an acid dissolving solution into the primary graphite powder set, and restarting the oscillator to oscillate the primary graphite powder set comprising the acid dissolving solution until the oscillation time reaches a specified fourth time length to obtain an acid-removed graphite powder set;

Adding alkaline solution into the deacidification graphite powder set, and restarting the oscillator to oscillate the deacidification graphite powder set comprising the alkaline solution until the oscillation time reaches a specified fifth time length to obtain a standard graphite powder set

Filtering the standard graphite powder set, and then cleaning the filtered standard graphite powder set by using N-methyl-2-pyrrolidone to obtain a clean graphite powder set;

and drying the clean graphite powder set to obtain the refined graphite powder.

In order to solve the above problems, the present invention also provides a negative electrode material recovery apparatus for retired lithium ion batteries, the apparatus comprising:

the lithium battery discharging module is used for acquiring a retired lithium battery set, performing specification classification on the retired lithium battery set to obtain a plurality of groups of retired lithium batteries with different specifications, starting a pre-built negative electrode material recoverer, wherein the negative electrode material recoverer comprises an intelligent energy storage module, a discharging module, a crushing module, a calcining module and a graphite refining module, electric energy of the intelligent energy storage module is sourced from the discharging module, a plurality of groups of retired lithium batteries with different specifications are placed in a plurality of groups of battery placing grooves in the discharging module, each group of battery placing grooves is used for placing retired lithium batteries with the same specification, starting the discharging module, receiving electric energy emitted by the retired lithium batteries in each group of battery placing grooves, and obtaining emitted electric energy and an empty lithium battery set;

The crushing and separating module is used for transmitting the discharged electric energy back to the intelligent energy storage module for storage to obtain stored electric energy, and performing crushing and separating operation on the empty lithium battery set in the crushing module to obtain a crushed lithium fragment set, wherein the electric energy supplied by the crushing and separating operation is preferentially selected from the stored electric energy until the voltage of the stored electric energy does not meet the voltage requirement of the crushing and separating operation, and the electric energy supplied by the crushing and separating operation is obtained from a power grid;

the high-temperature calcination module is used for performing high-temperature calcination on the broken lithium fragment set by utilizing the calcination module to obtain a hybrid graphite powder set;

and the graphite refining module is used for placing the mixed graphite powder set into a graphite refining module to perform graphite refining to obtain refined graphite powder, wherein the electric energy supplied by the calcining module and the graphite refining module is selected to be the same as that supplied by the crushing module, and the negative electrode material recovery of the retired lithium ion battery is completed.

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 to implement the above-described method for recycling negative electrode material of retired lithium-ion batteries.

In order to solve the above problems, the present invention also provides a computer readable storage medium having at least one instruction stored therein, the at least one instruction being executed by a processor in an electronic device to implement the above-described method for recycling anode materials of retired lithium ion batteries.

Compared with the prior art, the embodiment of the invention firstly starts the pre-constructed negative electrode material recoverer, wherein the negative electrode material recoverer comprises an intelligent energy storage module, a discharging module, a crushing module, a calcining module and a graphite refining module, and the electric energy of the intelligent energy storage module is derived from the discharging module, compared with the traditional method of recovering the negative electrode material by depending on a physical chemistry method, the negative electrode material recoverer provided by the embodiment of the invention has the intelligent energy storage module, wherein the intelligent energy storage module mainly plays a role of collecting the electric energy of the discharging module, the main working flow of the intelligent energy storage module is to firstly store the electric energy derived from the discharging module, then the stored electric energy is used for supplying the subsequent crushing module, the calcining module and the graphite refining module, thereby avoiding the electric energy from being stored in a power grid on one hand when the traditional method of executing the recovery of the negative electrode material of the retired lithium battery, on the other hand, when the electric energy is continuously released for crushing and calcining the lithium battery, the problem of damage to the battery storing the electric energy is caused when the electric energy is charged and discharged simultaneously is solved, thereby achieving the recycling of electric energy resources and preventing the waste of the electric energy resources, therefore, further, a plurality of groups of retired lithium batteries with different specifications are placed in a plurality of groups of battery placing grooves in the discharging module, each group of battery placing grooves is provided with retired lithium batteries with the same specification, the discharging module is started, the electric energy discharged by the retired lithium batteries in each group of battery placing grooves is received, the discharged electric energy and the empty energy lithium battery set are obtained, and the discharged electric energy is returned to the intelligent energy storage module for storage, so that compared with other negative electrode material recycling methods, the discharging electric energy of each retired lithium ion battery is effectively stored, thereby forming electric energy circulation, the method comprises the steps of collecting an empty energy lithium battery in a crushing module, performing crushing separation operation to obtain a crushed lithium fragment set, wherein the stored electric energy is preferentially selected by the supplied electric energy of the crushing separation operation until the voltage of the stored electric energy does not meet the voltage requirement of the crushing separation operation, acquiring the electric energy supplied to the crushing separation operation from a power grid by utilizing an intelligent energy storage module, and in addition, performing high-temperature calcination on the crushed lithium fragment set by a calcination module, performing graphite refining and other electric energy driving principles by a graphite refining module, which are the same as those of the crushing module, sequentially, when the discharging electric energy released by a retired lithium ion battery is higher, the electric energy additionally acquired from the power grid by a negative electrode material is less, so that the electric energy resource saving is effectively realized.

Drawings

Fig. 1 is a schematic flow chart of a method for recycling negative electrode materials of a retired lithium ion battery according to an embodiment of the present invention;

FIG. 2 is a functional block diagram of a negative electrode material recycling apparatus 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 method for recycling a negative electrode material of a retired lithium ion battery according to an embodiment of the 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 method for recycling negative electrode materials of retired lithium ion batteries. The execution main body of the method for recycling the anode material of the retired lithium ion battery comprises, but is not limited to, at least one of a service end, a terminal and the like which can be configured to execute the method provided by the embodiment of the application. In other words, the method for recycling the negative electrode material 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 method for recycling anode materials of a retired lithium ion battery according to an embodiment of the invention is shown. In this embodiment, the method for recovering the anode material of the retired lithium ion battery includes:

s1, obtaining a retired lithium battery set, and performing specification classification on the retired lithium battery set to obtain a plurality of groups of retired lithium batteries with different specifications.

It can be explained that the retired lithium battery set is a lithium battery set that needs to be retired by artificial subjective judgment or by reaching the use limit under an objective environment. For example, the small sheets are used as battery recoverers of the retired battery recovery plant, and the retired lithium batteries collected from all the parties at present need to be disassembled and recovered, namely, the positive electrode material, the negative electrode material and the electrolyte are obtained by disassembling the positive electrode material, the negative electrode material, the electrolyte and other components according to the retired lithium batteries. It should be emphasized that the embodiment of the present invention is mainly aimed at recovering the negative electrode material from the retired lithium battery, and the main component of the negative electrode material of the current retired lithium battery having recovery value is graphite, i.e. how to recover graphite from the retired lithium battery is a technical problem of great concern in the embodiment of the present invention.

It can be understood that the sizes of the retired lithium batteries collected from different sources are generally different, so in order to facilitate the smooth execution of the subsequent recovery of the negative electrode material, the embodiment of the invention firstly performs the specification classification on the retired lithium battery set, i.e. the retired lithium batteries with the same specification and model are used as a group, thereby obtaining a plurality of groups of retired lithium batteries with different specifications.

S2, starting a pre-constructed negative electrode material recoverer, wherein the negative electrode material recoverer comprises an intelligent energy storage module, a discharging module, a crushing module, a calcining module and a graphite refining module, and the electric energy of the intelligent energy storage module is derived from the discharging module.

It should be noted that the core steps of the recovery of the negative electrode material in the embodiment of the present invention are all performed in a pre-constructed negative electrode material recoverer, and one of the main innovative points of the embodiments of the present invention is that an intelligent energy storage module is constructed in the negative electrode material recoverer, where the main purpose of the intelligent energy storage module is to supply electric energy to the crushing module, the calcining module and the graphite refining module, but most of the retired battery negative electrode material recovery technologies do not consider recovering and continuously utilizing the discharge energy of the discharging process of the retired lithium ion battery, so that the resource waste of the discharge electric energy of the retired lithium ion battery is caused, and therefore, the embodiment of the present invention constructs the discharge electric energy of the intelligent energy storage module to recover the discharge electric energy of the discharge module, so as to improve the data utilization rate.

In addition, it should be explained that the intelligent energy storage module of the embodiment of the invention stores the electric energy from the discharging module, and then uses the stored electric energy for supplying to the subsequent crushing module, calcining module and graphite refining module, so that the problem that the battery storing the electric energy is damaged when the traditional method is used for carrying out the recovery of the negative electrode material of the retired lithium battery, on the one hand, the electric energy is stored from the power grid, and on the other hand, the electric energy is continuously released for crushing and calcining the lithium battery, and the battery storing the electric energy is charged and discharged simultaneously is avoided.

S3, placing a plurality of groups of retired lithium batteries with different specifications into a plurality of groups of battery placing grooves in the discharging module, wherein each group of battery placing grooves is used for placing retired lithium batteries with the same specification.

It can be appreciated that for the recovery of the negative electrode material of the retired lithium ion battery, the internal electric energy of the retired lithium ion battery needs to be emptied first, so as to prevent explosion hazard caused by overhigh internal electric energy of the retired lithium ion battery. It should be explained that, compared with other discharging modules, the essential difference of the embodiment of the invention is that the discharging electric energy released by the retired lithium battery can be stored and transmitted back to the intelligent energy storage module. In detail, the module of discharging comprises multiunit battery standing groove and multiunit discharge circuit and multiunit blowdown circuit, wherein battery standing groove is the same with the quantity of discharge circuit, the quantity of discharge circuit and blowdown circuit is the same, link to each other through intelligent switch between discharge circuit and the blowdown circuit, when intelligent switch closed, battery standing groove links to each other with discharge circuit, when intelligent switch open, battery standing groove links to each other with the blowdown circuit, and every group battery standing groove all is as the power supply of corresponding discharge circuit and blowdown circuit, and include protection resistance and condenser in the discharge circuit, wherein the condenser is arranged in the discharge electric energy that the storage battery standing groove released, including consuming resistance in the blowdown circuit.

Based on the structural explanation of the discharging module, after the retired lithium battery set is obtained, the discharging module is used for storing the discharging electric energy released by the retired lithium battery set in the next step. In detail, the placing the plurality of groups of retired lithium batteries with different specifications in the plurality of groups of battery placing grooves in the discharging module comprises the following steps:

It can be understood that in the embodiment of the invention, the retired lithium batteries with the same specification are all placed in the same battery placing groove, and the main purpose of the method is to avoid the line damage of the discharge module caused by different electric energy released by the retired lithium batteries with different specifications. For example, assuming that the small sheets collect 8 groups of retired lithium batteries with different specifications, 8 battery placing grooves are selected in the discharging module, and each group of retired lithium batteries is placed in each battery placing groove, 2 retired lithium batteries with the same specification may be placed in the 1 st battery placing groove, only 1 retired lithium battery is placed in the 2 nd battery placing groove, 3 retired lithium batteries with the same specification are placed in the 3 rd battery placing groove, and the like.

And S4, starting the discharging module, and receiving electric energy emitted by the retired lithium batteries in each group of battery placing grooves to obtain emitted electric energy and an empty energy lithium battery set.

It should be emphasized that when the internal electric energy of the retired lithium ion battery is transferred to the capacitor, it needs to ensure that the voltage of the retired lithium ion battery is stable and higher than a certain voltage threshold, and because the voltage of the retired lithium ion battery is reduced as the electric energy of the retired lithium ion battery is continuously transferred to the capacitor for storage, the embodiment of the invention can terminate the charging operation of the capacitor, further convert the capacitor into an emptying circuit, and consume the residual electric energy of the retired lithium ion battery by using the consumption resistor of the emptying circuit.

It can be understood that after the battery placing grooves and the retired lithium batteries are placed correspondingly, the discharging module can be started, and the capacitor in the discharging module is used for storing the electric energy emitted by the retired lithium batteries in each group of battery placing grooves, so that the emitted electric energy is obtained.

In detail, start the module that discharges, receive the electric energy that the retired lithium cell of every group battery standing groove released, obtain and release electric energy and empty can lithium cell collection, include:

Collecting the released electric energy of the retired lithium battery by using a discharge circuit to obtain the released electric energy;

In addition, when each of the retired lithium batteries is completed after the discharging circuit and the discharging circuit perform the discharging operation, the retired lithium battery excluding electric energy is called an empty energy lithium battery in the embodiment of the present invention.

S5, the discharged electric energy is returned to the intelligent energy storage module to be stored, and stored electric energy is obtained.

It can be understood that, after the discharging module finishes the discharging operation on the retired lithium battery set to obtain the discharging electric energy, in order to recycle the discharging electric energy, the embodiment of the invention returns the discharging electric energy to the intelligent energy storage module, in detail, the returning the discharging electric energy to the intelligent energy storage module for storage to obtain the stored electric energy, including:

starting each capacitor in the discharging module;

indicating stored power,/->

Indicate->

The discharging electric energy stored by each capacitor is led into the intelligent energy storage moduleGroup introduction efficiency,/-, and>

indicate->

Discharging electric energy stored in the individual capacitors, +.>

Fading factor indicative of age of the tank, < ->

For example, there are 8 groups of retired lithium batteries with different specifications in the set of retired lithium batteries, so that the corresponding 8 battery placing grooves and capacitors are used for storing the discharging electric energy released by the 8 groups of retired lithium batteries with different specifications, and the electric energy value of the energy storage pool led into the intelligent energy storage module, namely the stored electric energy, can be calculated by the stored electric energy calculation formula.

S6, performing crushing and separating operation on the empty energy lithium battery set in the crushing module to obtain a crushed lithium fragment set, wherein the electric energy supplied by the crushing and separating operation is preferentially selected from the stored electric energy until the voltage of the stored electric energy does not meet the voltage requirement of the crushing and separating operation, and acquiring the electric energy supplied by the crushing and separating operation from a power grid by utilizing the intelligent energy storage module.

It should be understood that the main purpose of performing the breaking separation operation is to break down the battery structure of the retired lithium battery, so as to break down the retired lithium battery from an overall battery structure into a series of broken lithium fragments including positive electrode material, negative electrode material and electrolyte, and thus facilitate the acquisition of the negative electrode material from the broken lithium fragments. Further, in the embodiment of the invention, the crushing and separating operation is performed by using the crushing module, wherein the crushing module comprises an extrusion plate and a separator, the extrusion plate extrudes the retired lithium battery, so that the aim of destroying the integral structure of the retired lithium battery is fulfilled, and secondly, according to different densities of each material, the positive electrode material, the negative electrode material and the electrolyte extruded by the extrusion plate are subjected to rotary separation by the separator, so that a crushed lithium fragment set is obtained, wherein the electrolyte is generally removed for the most part due to the instability of the liquid during the rotary separation, and the crushed lithium fragment set mainly comprises the positive electrode material, the negative electrode material and a small part of electrolyte.

In order to fully utilize resources and prevent excessive waste of electric energy resources, the embodiment of the invention preferably uses electric energy discharged by a retired lithium battery stored in an intelligent energy storage module as supplied electric energy for crushing and separating operation, and in detail, the steps of collecting an empty energy lithium battery in the crushing module to execute the crushing and separating operation to obtain a crushed lithium fragment set include:

For example, the required electric energy required by the empty energy lithium battery set for performing the breaking and separating operation is 1000 joules, while the stored electric energy is only 800 joules, so that the remaining 200 joules are required to be obtained as electric energy supply by connecting the power grid after the stored electric energy is used up. It should be noted that the calculating, according to the set of empty lithium batteries, the electric energy required for executing the crushing and separating operation in the crushing module to obtain the required electric energy includes:

It can be understood that the quality, the volume and the battery density of the retired lithium batteries with different specifications are different, so that the crushing electric energy required by the crushing separation is different, and therefore, the embodiment of the invention separately counts the crushing electric energy of the retired lithium batteries with each specification and finally adds the crushing electric energy to obtain the required electric energy.

In addition, according to the quantity, the quality, the volume and the density of the batteries, the crushing electric energy required by the crushing module to crush and separate the retired lithium batteries of each specification is calculated, wherein the crushing module consists of a squeezing plate and a separator and comprises:

indicating the required extrusion power of the extrusion plate, +.>

For calculating the weighting factor of the extruded electrical energy, +.>

Representing lithium retired per extrusion unit volume of extrusion plateUnit extrusion power required by the battery, +.>

For the volume of the retired lithium battery, +.>

The density of the retired lithium battery;

represents the separation power required by the separator, +.>

For calculating the weighting factors for the separation of electrical energy, +.>

The quality of the retired lithium battery;

It can be understood that the main innovation point of the embodiment of the invention in executing the breaking and separating operation of the retired lithium battery is to reasonably utilize the discharging electric energy discharged by the retired lithium battery before, thereby achieving the maximum utilization of resources.

And S7, performing high-temperature calcination on the broken lithium fragment set by using the calcination module to obtain the hybrid graphite powder set, wherein the power supply selection of the calcination module is the same as that of the breaking module.

As can be seen from step S6, the crushed lithium chip set obtained by performing the crushing and separating operation in the crushing module mainly includes a positive electrode material, a negative electrode material and a small portion of electrolyte, wherein the positive electrode material mainly includes a metal, and the electrolyte mainly includes an organic solvent, etc., so that the main purpose of step S7 is to extract the graphite-based hybrid graphite powder set in a coarse step.

In detail, the high-temperature calcination is performed on the broken lithium chip set by using the calcination module to obtain a hybrid graphite powder set, which comprises the following steps:

It can be known that the broken lithium chip set mainly comprises a positive electrode material, a negative electrode material and a small part of electrolyte, while the negative electrode material mainly comprises graphite, and the positive electrode material mainly comprises metal, wherein the melting point of graphite is obviously higher than that of metal, and the melting point of metal is higher than that of electrolyte, so that the electrolyte is removed firstly, and the electrolyte can be volatilized after the first calcination tank is heated to a first set temperature and maintained for a specified first time period, and in order to improve the volatilization effect of the electrolyte, subcritical carbon dioxide and acetonitrile solvent are added to help faster dissolution and volatilization of the electrolyte. In addition, it should be understood that the calcination module further comprises a reflux device for refluxing the volatilized electrolyte.

Further, in order to ensure the purity of the whole high-temperature calcination, after the volatilization of the electrolyte is completed, the calcined lithium chip set is transferred into a second calcination tank of the calcination module, and the second calcination tank is heated to a second set temperature, wherein the second set temperature is generally higher than 300 ℃, the first set temperature is higher than 150 ℃, and the second set temperature is higher than the first set temperature.

In addition, it should be noted that the high-temperature calcination needs to be performed multiple times, wherein the supply electric energy required for heating still originates from the stored electric energy (provided that the crushing and separating operation does not consume the stored electric energy) at first, and the electric energy for supplying the high-temperature calcination operation is obtained from the power grid by using the intelligent energy storage module until the stored electric energy is consumed.

S8, placing the mixed graphite powder set into a graphite refining module to perform graphite refining to obtain refined graphite powder, and completing the recovery of the negative electrode material of the retired lithium ion battery.

It is understood that the power supply selection of the graphite refining module is the same as that of the crushing module, and will not be described in detail herein. In addition, in the embodiment of the invention, graphite powder with low fineness is obtained in the step S7 through a heating method, and the main purpose of the step S8 graphite refining is to purify graphite with higher purity, so that the recovery of the negative electrode material of the retired lithium ion battery is completed.

In detail, the step of placing the hybrid graphite powder set into a graphite refining module to perform graphite refining to obtain refined graphite powder comprises the following steps:

and drying the clean graphite powder set to obtain the refined graphite powder.

In the embodiment of the invention, the addition of the dimethyl carbonate has two main effects: 1. preventing electrolyte from remaining in the step S7; 2. part of acidic substances in the mixed graphite powder are dissolved out. Therefore, before graphite refining is performed, dimethyl carbonate is added again and repeatedly oscillated, thereby obtaining a primary graphite powder set. It can be understood that a large amount of positive electrode materials or other impurities still remain in the primary graphite powder set, wherein the positive electrode materials or other impurities generally consist of acid-base materials, so that the acid dissolving solution and the alkaline dissolving solution are sequentially added in the primary graphite powder set in the embodiment of the invention, and the positive electrode materials or other impurities can be effectively removed. In addition, it should be explained that N-methyl-2-pyrrolidone is attached to nodules of standard graphite powder in an acid-base reaction for cleaning, so that the graphite powder can be purified to the greatest extent to obtain refined graphite powder, and thus, the recovery of negative electrode materials of retired lithium ion batteries is completed.

Example 2:

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

The negative electrode material recovery device 100 of the retired lithium ion battery can be installed in electronic equipment. Depending on the functions implemented, the negative electrode material recovery device 100 of the retired lithium ion battery may include a lithium battery discharging module 101, a breaking and separating module 102, a high temperature calcining module 103, and a graphite refining 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 lithium battery discharging module 101 is configured to obtain a retired lithium battery set, perform specification classification on the retired lithium battery set to obtain multiple groups of retired lithium batteries with different specifications, start a pre-built negative electrode material recoverer, wherein the negative electrode material recoverer comprises an intelligent energy storage module, a discharging module, a crushing module, a calcining module and a graphite refining module, electric energy of the intelligent energy storage module is derived from the discharging module, multiple groups of retired lithium batteries with different specifications are placed in multiple groups of battery placing grooves in the discharging module, each group of battery placing grooves is respectively provided with retired lithium batteries with the same specification, start the discharging module, receive electric energy emitted by the retired lithium batteries in each group of battery placing grooves, and obtain emitted electric energy and an empty lithium battery set;

The crushing and separating module 102 is configured to return the discharged electric energy to the intelligent energy storage module for storage to obtain stored electric energy, and perform crushing and separating operation on the empty lithium battery set in the crushing module to obtain a crushed lithium fragment set, where the electric energy supplied by the crushing and separating operation is preferentially selected from the stored electric energy until the voltage of the stored electric energy does not reach the voltage requirement of the crushing and separating operation, and acquire the electric energy supplied by the crushing and separating operation from the power grid by using the intelligent energy storage module;

the high-temperature calcination module 103 is configured to perform high-temperature calcination on the broken lithium fragment set by using the calcination module, so as to obtain a hybrid graphite powder set;

the graphite refining module 104 is configured to put the hybrid graphite powder set into a graphite refining module to perform graphite refining to obtain refined graphite powder, where the electric energy supplied by the calcination module and the graphite refining module is selected to be the same as that supplied by the crushing module, so as to complete the recovery of the negative electrode material of the retired lithium ion battery.

In detail, the modules in the negative electrode material recovery device 100 of the retired lithium ion battery in the embodiment of the present invention use the same technical means as the above-mentioned method for recovering the negative electrode material of the retired lithium ion battery 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 negative electrode material of 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 negative electrode material recycling program of a retired lithium ion battery.

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 a negative electrode material recovery program of a retired lithium ion battery, 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 the respective components 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 (for example, a negative electrode material recovery program of a retired lithium ion battery, etc.) stored in the memory 11, and recalling 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 negative electrode material recovery 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, which when executed in the processor 10, can implement:

performing crushing and separating operation on the empty energy lithium battery set in the crushing module to obtain a crushed lithium fragment set, wherein the electric energy supplied by the crushing and separating operation is preferably selected from the stored electric energy until the voltage of the stored electric energy does not meet the voltage requirement of the crushing and separating operation, and acquiring the electric energy supplied by the crushing and separating operation from a power grid by utilizing the intelligent energy storage module;

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. A method for recycling negative electrode materials of retired lithium ion batteries, the method comprising:

the electric energy to be discharged is returned to the intelligent energy storage module to be stored, and the stored electric energy is obtained, and the method comprises the following steps: starting each capacitor in the discharging module; the discharging electric energy stored by each capacitor is sequentially led into an energy storage pool of the intelligent energy storage module to obtain stored electric energy, wherein the calculation formula of the stored electric energy is as follows:

Indicating stored power,/->

Indicate->

Indicate->

Discharging electric energy stored in the individual capacitors, +.>

Fading factor indicative of age of the tank, < ->

The service life of the energy storage pool of the intelligent energy storage module is prolonged;

performing a crushing and separating operation on the empty energy lithium battery set in the crushing module to obtain a crushed lithium fragment set, wherein the supplied electric energy of the crushing and separating operation preferentially selects the stored electric energy until the voltage of the stored electric energy does not meet the voltage requirement of the crushing and separating operation, and acquiring the electric energy supplied to the crushing and separating operation from a power grid, including: calculating electric energy required by executing crushing and separating operation in the crushing module according to the empty energy lithium battery set to obtain required electric energy; when the required electric energy is greater than or equal to the stored electric energy, testing whether the electric energy supply between the crushing module and the power grid is normal, and when the electric energy supply between the crushing module and the power grid is abnormal, generating a power grid electric energy acquisition abnormality reminding instruction while suspending the crushing and separating operation, and sending the power grid electric energy acquisition abnormality reminding instruction to maintenance personnel of the negative electrode material recoverer; when the electric energy supply between the crushing module and the power grid is normal, directly placing the empty energy lithium battery set into the crushing module, and starting the crushing module to execute crushing and separating operation to obtain a crushed lithium fragment set;

2. The method for recycling the negative electrode material of the retired lithium ion battery according to claim 1, wherein the discharging module consists of a plurality of groups of battery placing grooves, a plurality of groups of discharging circuits and a plurality of groups of discharging circuits, wherein the number of the battery placing grooves is the same as that of the discharging circuits, the discharging circuits and the discharging circuits are connected through intelligent switches, when the intelligent switches are closed, the battery placing grooves are connected with the discharging circuits, when the intelligent switches are opened, the battery placing grooves are connected with the discharging circuits, each group of battery placing grooves are used as power supplies of the corresponding discharging circuits and the discharging circuits, the discharging circuits comprise protection resistors and capacitors, the capacitors are used for storing discharging electric energy emitted by the battery placing grooves, and the discharging circuits comprise consumption resistors;

And start the module that discharges, receive the electric energy that the retired lithium cell of every group battery standing groove released, obtain and release electric energy and empty can lithium cell collection, include:

3. The method for recycling negative electrode materials of retired lithium-ion batteries according to claim 2, wherein placing a plurality of sets of retired lithium-ion batteries of different specifications in a plurality of sets of battery placement grooves in the discharging module comprises:

4. The method for recycling negative electrode materials of retired lithium-ion battery according to claim 1, wherein the calculating electric energy required by the crushing and separating operation in the crushing module according to the empty energy lithium battery set to obtain the required electric energy comprises:

5. The method for recycling negative electrode materials of retired lithium ion battery according to claim 4, wherein the crushing electric energy required by the crushing module for crushing and separating retired lithium ion battery of each specification is calculated according to the number, mass, volume and density of the battery, wherein the crushing module consists of an extrusion plate and a separator, and comprises:

indicating the required extrusion power of the extrusion plate, +.>

For calculating the weighting factor of the extruded electrical energy, +.>

For the volume of the retired lithium battery, +.>

The density of the retired lithium battery;

represents the separation power required by the separator, +.>

The quality of the retired lithium battery;

6. The method for recycling negative electrode material of retired lithium-ion battery according to claim 5, wherein the step of performing high-temperature calcination on the broken lithium chip set by the calcination module to obtain a hybrid graphite powder set comprises:

7. The method for recycling negative electrode material of retired lithium ion battery according to claim 6, wherein the step of placing the hybrid graphite powder set into a graphite refining module to perform graphite refining to obtain refined graphite powder comprises:

and drying the clean graphite powder set to obtain the refined graphite powder.

8. A negative electrode material recovery device for retired lithium ion batteries, the device comprising:

The broken separation module for with the electric energy that discharges back to intelligent energy storage module execution storage, obtain the storage electric energy, include: starting each capacitor in the discharging module; the discharging electric energy stored by each capacitor is sequentially led into an energy storage pool of the intelligent energy storage module to obtain stored electric energy, wherein the calculation formula of the stored electric energy is as follows:

indicating stored power,/->

Indicate->

Indicate->

Discharging electric energy stored in the individual capacitors, +.>

Representing the storage of retired lithium battery setsTotal number of capacitors discharged with discharged energy, +.>

Fading factor indicative of age of the tank, < ->

For the service life of the energy storage pond of intelligent energy storage module, with empty energy lithium cell collection in the broken module carries out broken separation operation, obtains broken lithium fragment collection, wherein the electric energy of supplying of broken separation operation preferentially selects the stored electric energy, when the voltage of stored electric energy does not reach broken separation operation's voltage requirement, obtain the electric energy of supplying of broken separation operation from the electric wire netting, include: calculating electric energy required by executing crushing and separating operation in the crushing module according to the empty energy lithium battery set to obtain required electric energy; when the required electric energy is greater than or equal to the stored electric energy, testing whether the electric energy supply between the crushing module and the power grid is normal, and when the electric energy supply between the crushing module and the power grid is abnormal, generating a power grid electric energy acquisition abnormality reminding instruction while suspending the crushing and separating operation, and sending the power grid electric energy acquisition abnormality reminding instruction to maintenance personnel of the negative electrode material recoverer; when the electric energy supply between the crushing module and the power grid is normal, directly placing the empty energy lithium battery set into the crushing module, and starting the crushing module to execute crushing and separating operation to obtain a crushed lithium fragment set;