CN109742471B - Processing system of retired battery - Google Patents
Processing system of retired battery Download PDFInfo
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- CN109742471B CN109742471B CN201811448806.1A CN201811448806A CN109742471B CN 109742471 B CN109742471 B CN 109742471B CN 201811448806 A CN201811448806 A CN 201811448806A CN 109742471 B CN109742471 B CN 109742471B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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Abstract
The invention provides a processing system of a retired battery, which comprises: the system comprises an energy management device, a retired battery device and a bidirectional converter device; the ex-service battery device comprises M ex-service battery clusters, each ex-service battery cluster consists of a plurality of ex-service battery packs connected in series, each ex-service battery cluster is connected with a first end of the bidirectional converter device, a second end of the bidirectional converter device is connected with a power grid, the energy management device is respectively in communication connection with the M ex-service battery clusters and the bidirectional converter device, and M is an integer greater than 0; and the energy management device is used for controlling the retired battery cluster to charge and discharge. The ex-service battery pack directly adopting the whole vehicle series connection is used for carrying out echelon utilization on the ex-service battery, the battery does not need to be disassembled and reassembled, and the echelon utilization cost is reduced.
Description
Technical Field
The invention relates to the field of power batteries, in particular to a processing system for a retired battery.
Background
With the continuous expansion of the popularization scale of new energy automobiles in China, the echelon utilization of retired power batteries is already put forward in a agenda. The reuse of the retired battery is of great significance to the society, the environment and the development of the battery. In the aspect of economy, the use cost of the power battery system on the whole vehicle can be reduced; in the aspect of environment, the problem of treatment of harmful substances generated by waste batteries is reduced, the recycling of battery materials is promoted, and the problem that the harmful substances of the batteries pollute the environment due to the discarding of the batteries is avoided; in the social aspect, the development of new energy industry can be better promoted by using the retired battery, the harmless development of the lithium battery is promoted, and the production of the lithium battery can be reduced, so that the resources consumed by the production of the lithium battery can be saved; the research and development value promotes the exploration of the battery industry, and is more beneficial to the improvement of the development problem of the whole life cycle of the battery.
In the related art, batteries with residual capacity of 70% -80% of the initial capacity are selected from retired batteries, the batteries are disassembled from the original structure, the batteries are classified according to the capacity, internal resistance and the like of a battery cell, the batteries are classified into different grades, and the batteries are assembled into a battery pack with a new circuit structure in a reassembling mode for use.
This disassembly and reassembly approach is not only complicated, requiring redesign of the circuit connections, but also increases the cost of the echelon utilization.
Disclosure of Invention
The invention provides a processing system of a retired battery, which directly adopts a retired battery pack connected with a whole vehicle in series to perform echelon utilization on the retired battery, does not need to disassemble and reassemble the battery, and reduces the echelon utilization cost.
The invention provides a processing system of a retired battery, which comprises: the system comprises an energy management device, a retired battery device and a bidirectional converter device;
the ex-service battery device comprises M ex-service battery clusters, each ex-service battery cluster consists of a plurality of ex-service battery packs of the whole vehicle connected in series, each ex-service battery cluster is connected with a first end of the bidirectional converter device, a second end of the bidirectional converter device is connected with a power grid, the energy management device is respectively in communication connection with the M ex-service battery clusters and the bidirectional converter device, and M is an integer greater than 0;
and the energy management device is used for controlling the retired battery cluster to charge and discharge.
Optionally, the retired battery device includes N retired battery packs, each retired battery pack includes at least one retired battery cluster, remaining capacities of the retired battery clusters in the same retired battery pack are the same or a difference between the remaining capacities is smaller than or equal to a preset capacity threshold, and N is an integer greater than 0 and smaller than M.
Optionally, the processing system further includes: m first switching devices;
each retired battery cluster corresponds to one first switch device, a first end of each first switch device is connected with each retired battery cluster, and a second end of each first switch device is connected with a first end of the bidirectional converter device.
Optionally, the processing system further includes: m second switching devices and M pre-charging resistors;
each retired battery cluster corresponds to one second switch device and one pre-charging resistor, each retired battery cluster is connected with a first end of each pre-charging resistor, a second end of each pre-charging resistor is connected with a first end of each second switch device, and a second end of each second switch device is connected with a first end of the bidirectional converter device.
Optionally, the bidirectional converter device includes N bidirectional converters;
each of the retired battery packs corresponds to one of the bidirectional converters, the second end of each first switching device in each of the retired battery packs is connected with the first end of each of the bidirectional converters, the second end of each second switching device in each of the retired battery packs is connected with the first end of each of the bidirectional converters, and the second end of each of the bidirectional converters is connected with the power grid.
Optionally, the second end of the bidirectional converter device is further connected to a load, and the energy management device is configured to obtain the order of the remaining life of the N retired battery packs from large to small, and the required power of the load;
selecting X retired battery packs with the residual lives ranked at the top X from the N retired battery packs, and controlling the first switch devices corresponding to the X retired battery packs to be closed so as to enable the X retired battery packs to charge the load, wherein the sum of the powers of the X retired battery packs is larger than the required power of the load, and X is an integer larger than 0.
Optionally, the energy management device is specifically configured to determine, according to a first real-time voltage of each retired battery cluster of each retired battery pack in X retired battery packs obtained in real time, a plurality of first real-time voltage differences between each retired battery cluster of each retired battery pack in the X retired battery packs and each other retired battery cluster in each retired battery pack;
and controlling the closing of a first switch device or a second switch device corresponding to a retired battery cluster in the X retired battery packs according to the plurality of first real-time pressure differences, and a preset maximum pressure difference threshold value and an allowable pressure difference threshold value, wherein the maximum pressure difference threshold value is greater than the allowable pressure difference threshold value.
Optionally, the energy management device is specifically configured to determine, if a first real-time differential pressure of the plurality of first real-time differential pressures is greater than the maximum differential pressure threshold, a plurality of pairs of first battery cluster pairs corresponding to the first real-time differential pressure greater than the maximum differential pressure threshold;
in each pair of the first battery cluster, controlling the first switch device corresponding to the retired battery cluster with the larger first real-time voltage to be closed;
if a first real-time pressure difference is smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value, determining a plurality of pairs of second battery cluster pairs corresponding to the first real-time pressure difference smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value;
in each pair of the second battery cluster, controlling the second switch device corresponding to the retired battery cluster with the larger first real-time voltage to be closed;
and if the first real-time pressure differences are all smaller than the allowable pressure difference threshold value, controlling the closing of a first switch device corresponding to a retired battery cluster in the X retired battery packs.
Optionally, the energy management device is further specifically configured to determine, according to a second real-time voltage of each retired battery cluster of each retired battery pack in X retired battery packs obtained in real time, a plurality of second real-time voltage differences between each retired battery cluster of each retired battery pack in the X retired battery packs and each other retired battery cluster in each retired battery pack;
and controlling the closing of a first switch device or a second switch device corresponding to a retired battery cluster in the X retired battery packs according to the plurality of second real-time pressure differences and preset maximum pressure difference threshold values and allowed pressure difference threshold values, wherein the maximum pressure difference threshold values are larger than the allowed pressure difference threshold values.
Optionally, the energy management device is specifically configured to determine, if a second real-time pressure difference exists in the plurality of second real-time pressure differences and is greater than the maximum pressure difference threshold, a plurality of pairs of third battery cluster pairs corresponding to the second real-time pressure difference greater than the maximum pressure difference threshold;
in each pair of the third battery cluster, controlling the first switch device corresponding to the retired battery cluster with the smaller second real-time voltage to be closed;
if a second real-time pressure difference is smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value, determining a plurality of pairs of fourth battery cluster pairs corresponding to the second real-time pressure difference smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value;
in each pair of the fourth battery cluster, controlling the second switch device corresponding to the retired battery cluster with the smaller second real-time voltage to be closed;
and if the second real-time pressure differences are all smaller than the allowable pressure difference threshold value, controlling the first switching devices corresponding to the retired battery clusters in the X retired battery packs to be closed.
The invention provides a processing system of a retired battery, which comprises: the system comprises an energy management device, a retired battery device and a bidirectional converter device; the ex-service battery device comprises M ex-service battery clusters, each ex-service battery cluster consists of a plurality of ex-service battery packs of the whole vehicle connected in series, each ex-service battery cluster is connected with a first end of the bidirectional current conversion device, a second end of the bidirectional current conversion device is connected with a power grid, the energy management device is respectively in communication connection with the M ex-service battery clusters and the bidirectional current conversion device, and M is an integer greater than 0; and the energy management device is used for controlling the retired battery cluster to charge and discharge. The system directly adopts the ex-service battery pack connected with the whole vehicle in series to perform echelon utilization on the ex-service battery, does not need to disassemble and reassemble the battery, and reduces the cost of echelon utilization.
Drawings
FIG. 1 is a first schematic diagram illustrating a connection structure of a system for processing retired batteries according to the present invention;
FIG. 2 is a schematic diagram of a connection structure of a system for processing retired batteries according to the present invention;
FIG. 3 is a third schematic diagram of the connection structure of the system for processing retired batteries according to the present invention;
fig. 4 is a schematic diagram of a connection structure of the processing system for retired batteries according to the present invention, and three corresponding three-phase lines are schematically connected.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of a connection structure of a system for processing a retired battery according to the first embodiment of the present invention, as shown in fig. 1, the system for processing a retired battery according to the present embodiment includes: energy management device, retired battery device, two-way current conversion device.
The bidirectional converter device in this embodiment has a bidirectional circulating current function, and for example, when the processing system of the retired battery provided in this embodiment is further connected with a load, that is, the retired battery device is in a discharging state, the bidirectional converter device converts the electric energy stored in the retired battery device from direct current to alternating current to supply to the load; when the processing system of the retired battery in this embodiment meets the charging condition, the retired battery device is in a charging state, and the bidirectional converter device converts the electric energy of the power grid from alternating current to direct current to charge the retired battery device.
Specifically, the charging condition in this embodiment may include, but is not limited to, 1, electricity price, and in a general electricity consumption peak period, when the electricity price is higher, the processing system of the retired battery discharges electricity to the load, so as to reduce the cost of the load directly using the electric energy of the power grid; and when the electricity consumption is in a low peak period, the processing system of the retired battery meets the charging condition, namely, the battery is charged from the power grid. 2. And when the user load is very high, the power grid cannot meet the user requirement, the electric quantity of the power grid which cannot meet the user requirement can be compensated through the processing system of the retired battery, and the processing system of the retired battery is in a discharging state. 3, frequency modulation is used.
The whole vehicle power supply system comprises various battery pack assemblies which are connected in series and/or in parallel, and when the whole vehicle battery pack assemblies are retired, namely energy cannot be effectively supplied to the whole vehicle system, the retired battery packs are subjected to secondary utilization, namely stepped utilization. In the related art, after the battery residual capacity of each battery pack originally connected in series or in parallel is screened, the battery pack with the residual capacity of 70% -80% of the initial capacity is selected for use in a echelon mode, and specifically, the battery packs meeting the conditions are disassembled from the original series or parallel structure and reassembled into a new circuit structure for use in the echelon mode. This disassembly and reassembly approach is not only complicated, requiring redesign of the circuit connections, but also increases the cost of the echelon utilization.
The decommissioning battery device in the embodiment comprises M decommissioning battery clusters, wherein M is an integer larger than 0, the M decommissioning battery clusters are connected in parallel, each decommissioning battery cluster is composed of a plurality of decommissioning battery packs of the whole vehicle connected in series, in the embodiment, the decommissioning battery packs of the series structure in the whole vehicle are directly used, the complex disassembly process is avoided, and the consistency of the batteries of the battery packs of the whole vehicle is good. Specifically, in order to effectively provide electric energy, before the retired battery packs of the series structure in the whole vehicle are used in parallel, the retired battery packs of the series structure need to be screened, in this embodiment, the retired battery packs of the series structure are selected to have the remaining capacity of 70% -80% of the initial capacity, and in the process of supplying power to the whole vehicle before the retired battery packs are retired, the information acquisition and control system of the whole vehicle acquires and stores the operation information of each battery pack in real time, transmits the operation information of each battery pack to the cloud platform in real time, and stores the battery information and the state through the cloud platform. Specifically, the cloud platform may calculate information such as internal battery resistance, remaining capacity, remaining life, and allowable voltage of each battery pack according to the operation information of each battery pack. In this embodiment, when the retired battery pack of the serial connection structure is selected, the data in the information acquisition and control system of the entire vehicle may be processed to obtain the retired battery pack of the serial connection structure that maintains 70% to 80% of the remaining capacity of the initial capacity, and the retired battery pack of the serial connection structure in the entire vehicle that meets the condition is formed into a retired battery cluster.
In this embodiment, each retired battery cluster is connected to a first end of a bidirectional converter device, a second end of the bidirectional converter device is connected to a power grid, and an energy management device is in communication connection with the M retired battery clusters and the bidirectional converter device, respectively. The energy management device is used for controlling the retired battery cluster to charge and discharge.
Illustratively, when the second end of the bidirectional converter is further connected to the load, the energy management device obtains the required power of the load, determines whether the retired battery device can meet the charging requirement of the load according to the maximum dischargeable power of the socdc of each retired battery cluster of the battery in the prior art, and if the maximum dischargeable power of the retired battery clusters is greater than the required power of the load, the energy management device controls the plurality of retired battery clusters to discharge. When the plurality of retired battery clusters meet the charging condition, the retired battery device is in a charging state, and the bidirectional converter device converts the electric energy of the power grid from alternating current to direct current to charge the retired battery device.
The invention provides a processing system of a retired battery, which comprises: the system comprises an energy management device, a retired battery device and a bidirectional converter device; the ex-service battery device comprises M ex-service battery clusters, each ex-service battery cluster consists of a plurality of ex-service battery packs of the whole vehicle connected in series, each ex-service battery cluster is connected with a first end of the bidirectional current conversion device, a second end of the bidirectional current conversion device is connected with a power grid, the energy management device is respectively in communication connection with the M ex-service battery clusters and the bidirectional current conversion device, and M is an integer greater than 0; and the energy management device is used for controlling the retired battery cluster to charge and discharge. The system directly adopts the ex-service battery pack connected with the whole vehicle in series to perform echelon utilization on the ex-service battery, does not need to disassemble and reassemble the battery, and reduces the cost of echelon utilization.
Based on the foregoing embodiments, the following describes the processing system of the retired battery and the retired battery device thereof provided by the present invention in detail with reference to fig. 2, where fig. 2 is a schematic diagram of a connection structure of the processing system of the retired battery provided by the present invention, and as shown in fig. 2, the retired battery device in the processing system of the retired battery provided by this embodiment includes N retired battery packs.
Each retired battery pack comprises at least one retired battery cluster, the residual capacity of each retired battery cluster in each retired battery pack is the same or the difference of the residual capacities is smaller than or equal to a preset capacity threshold, and N is an integer larger than 0 and smaller than M. In this embodiment, a plurality of retired battery clusters with the same residual capacity or with a residual capacity difference smaller than or equal to a preset capacity threshold are grouped into one group, and a plurality of retired battery packs are obtained. Because the number of the retired battery clusters is large, the charging and discharging requirements of each retired battery cluster are not consistent, the grouping mode divides a plurality of retired battery clusters with the same residual capacity or with the residual capacity difference smaller than the capacity threshold into one group, the energy management device can control the retired battery pack, and the processing process of the energy management device is simplified.
For example, as shown in fig. 2, each retired battery pack includes 3 retired battery clusters, and if the remaining capacity of each of the 3 retired battery clusters in the retired battery pack 1 is 80%, the remaining capacity of each of the 3 retired battery clusters in the retired battery pack 2 is 70%, and the energy management device determines that there is a charging demand for the retired battery pack 2, may control the power grid to charge the retired battery pack 2 alone.
As shown in fig. 2, the processing system provided in this embodiment further includes: m first switching devices.
Each retired battery cluster corresponds to one first switch device, the first end of each first switch device is connected with each retired battery cluster, and the second end of each first switch device is connected with the first end of the bidirectional converter device.
Illustratively, when the second end of the bidirectional converter device is further connected with the load, the energy management device obtains the required power of the load, and obtains the maximum dischargeable power of each retired battery cluster according to the prior art.
The energy management device determines a plurality of retired battery packs capable of meeting the charging requirement of the load, wherein the plurality of retired battery packs can be a part of the N retired battery packs, the sum of available power of the plurality of retired battery packs is larger than the required power of the load, and the energy management device controls the first switch device corresponding to each retired battery cluster in the plurality of retired battery packs to be closed, so that the plurality of retired battery clusters are discharged. In this embodiment, the energy management device may rank the maximum dischargeable power of the N retired battery packs from large to small, and select a plurality of retired battery packs ranked at the top with the sum of available power larger than the required power of the load to charge the load. Wherein the maximum available power of each retired battery pack is the sum of the maximum available power of a plurality of retired battery clusters included therein.
If the maximum dischargeable power of the N retired battery packs is ranked from large to small as 1, 2 and 3 … … N, the required power of the load is 20, and the sum of the available power of the retired battery packs 1, 2 and 3 is 22, the energy management device controls the first switch devices corresponding to the retired battery packs 1, 2 and 3 to be closed, so that the retired battery packs 1, 2 and 3 can charge the load.
In the processing system for retired batteries provided in this embodiment, the processing system includes M first switch devices, each retired battery cluster corresponds to one first switch device, and when the load is charged, the energy management device controls the first switch device corresponding to the retired battery cluster that charges the load to be closed, so that waste caused by charging all the retired battery clusters for the load is avoided. In addition, in the embodiment, the retired battery clusters with the largest dischargeable power are firstly adopted to charge the load, so that the residual electric quantity of each retired battery cluster is consistent, and the management of the energy management device is facilitated; when a power grid charges the retired battery cluster, controlling a first switch device corresponding to the retired battery cluster needing to be charged to be closed; furthermore, a plurality of retired battery clusters with the same residual capacity or with the residual capacity difference smaller than the capacity threshold value are divided into a group, so that the energy management device can control the retired battery pack, and the processing process of the energy management device is simplified.
On the basis of the foregoing embodiment, the following describes in detail the processing system for retired batteries provided by the present invention and the bidirectional converter device therein with reference to fig. 3, where fig. 3 is a schematic diagram of a connection structure of the processing system for retired batteries provided by the present invention, and as shown in fig. 3, the processing system for retired batteries provided by this embodiment further includes: m second switching devices and M pre-charge resistors, denoted by R in fig. 3. Fig. 4 is a schematic diagram of a connection structure of the processing system for retired batteries according to the present invention, and three corresponding three-phase lines are schematically connected.
Each retired battery cluster corresponds to one second switch device and one pre-charging resistor, each retired battery cluster is connected with the first end of each pre-charging resistor, the second end of each pre-charging resistor is connected with the first end of each second switch device, and the second end of each second switch device is connected with the first end of the bidirectional converter device.
Further, the bidirectional converter device in this embodiment includes N bidirectional converters.
Each retired battery pack corresponds to one bidirectional converter, the second end of each first switching device in each retired battery pack is connected with the first end of each bidirectional converter, the second end of each second switching device in each retired battery pack is connected with the first end of each bidirectional converter, and the second end of each bidirectional converter is connected with a power grid.
Optionally, in this embodiment, the bidirectional converter further includes M third switching devices, specifically, each battery cluster corresponds to one third switching device, a first end of each third switching device is connected to the second end of the first switching device and the second end of the second switching device, and a second end of each third switching device is connected to the first end of the bidirectional converter. The M third switching devices may perform corresponding opening and closing actions according to the opening and closing of the first switching device and the second switching device, and for example, when the first switching device or the second switching device is closed, the third switching device is closed. In this embodiment, the first switch device is a main positive switch, the third switch device is a main negative switch, and the second switch device is a pre-flush switch.
The following describes in detail the charging and discharging process of the system for treating a decommissioned battery provided in this embodiment.
1. And (3) discharging:
and the energy management device is used for acquiring the sequence of the residual lives of the N retired battery packs from large to small and the required power of the load when the second end of each bidirectional converter is connected with the load.
In this embodiment, the energy management device obtains the order of the remaining lives of the N retired battery packs from large to small, and specifically, the energy management device may obtain the remaining life of each retired battery pack from the cloud platform, and order the remaining lives in the order of large to small. The energy management device is further used for acquiring the required power of the load, and selecting the retired battery pack from the N retired battery packs according to the required power of the load to charge the load.
Specifically, the energy management device selects X retired battery packs with the remaining lives ranked at the top X from the N retired battery packs, and controls the first switch devices corresponding to the X retired battery packs to be closed, so that the X retired battery packs charge the load, wherein the sum of the powers of the X retired battery packs is greater than the required power of the load, and X is an integer greater than 0.
For example, the remaining life of the N retired battery packs may be ranked as battery pack 1, battery pack 2, … …, battery pack N; and if the sum of the power of the first X retired battery packs is larger than the required power of the load, X retired battery packs are selected to charge the load.
The specific manner of selecting X retired battery packs from N retired battery packs in this embodiment may refer to the manner of selecting the maximum available power of each retired battery pack in the above embodiment.
Specifically, the energy management device is specifically configured to obtain a first real-time voltage of each retired battery cluster of each retired battery pack in X retired battery packs in real time, specifically, the first real-time voltage of each retired battery cluster is a sum of accumulated voltages of battery packs in the retired battery clusters, wherein a slave control unit is arranged in each retired battery cluster, the slave control unit is available before retirement, the slave control unit can collect the real-time voltage of each battery pack in real time and send the real-time voltage to the energy management device, the energy management device obtains the real-time voltage of each retired battery cluster, and determines a plurality of first real-time voltage differences between each retired battery cluster of each retired battery pack in the X retired battery packs and each other retired battery cluster in each retired battery pack.
For example, the energy management device selects X retired battery packs in the processing system of the retired battery according to the remaining life of the battery packs, the energy management device controls the retired battery clusters in each retired battery pack in the same manner, and the following process for controlling the retired battery clusters in one retired battery pack from the energy management device is described. For example, the retired battery pack has three retired battery clusters 1, 2, and 3, wherein the current real-time voltage of the retired battery cluster 1 is 10V, the current real-time voltage of the retired battery cluster 2 is 20V, and the current real-time voltage of the retired battery cluster 3 is 60V; the energy management device obtains that the first real-time pressure difference of the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 is 10V and 50V respectively, and the first real-time pressure difference of the retired battery cluster 2 and the retired battery cluster 3 is 40V.
And the energy management device controls the first switch device or the second switch device corresponding to the retired battery cluster in the X retired battery packs to be closed according to the plurality of first real-time pressure differences, the preset maximum pressure difference threshold and the preset allowable pressure difference threshold, wherein the maximum pressure difference threshold is greater than the allowable pressure difference threshold.
It should be noted that X in this embodiment is an integer less than or equal to N, that is, in the discharging process in this embodiment, the X retired battery packs determined by the energy management device may be a part of the N retired battery packs, or may be all of the M retired battery packs.
Specifically, the energy management device is specifically configured to determine, if a first real-time pressure difference exists among the plurality of first real-time pressure differences and is greater than a maximum pressure difference threshold, a plurality of pairs of first battery cluster pairs corresponding to the first real-time pressure difference greater than the maximum pressure difference threshold; and in each pair of first battery cluster pairs, controlling the closing of the first switch device corresponding to the battery cluster with the larger first real-time voltage.
Illustratively, the first real-time pressure difference between the retired battery cluster 1 and the retired battery cluster 2 and the retired battery cluster 3 is 10V and 50V respectively, the first real-time pressure difference between the retired battery cluster 2 and the retired battery cluster 3 is 40V, the maximum pressure difference threshold is 45V, and the allowable pressure difference threshold is 30V; in the first real-time pressure difference, the first real-time pressure difference 50V between the retired battery cluster 1 and the retired battery cluster 3 is greater than the maximum pressure difference threshold value, and the first battery cluster pair is the retired battery cluster 1 and the retired battery cluster 3; the energy connection management device controls a first switch device corresponding to the retired battery cluster 3 with a larger first real-time voltage to be closed, the retired battery cluster 3 is controlled to charge a load first, and a bidirectional converter corresponding to the retired battery cluster 3 converts direct current into alternating current; after a period of charging, the first real-time voltage of the retired battery cluster 3 becomes 45V.
If the first real-time pressure difference is smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value, determining a plurality of pairs of second battery cluster pairs corresponding to the first real-time pressure difference smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value; and in each pair of second battery cluster pairs, controlling the second switch device corresponding to the battery cluster with the larger first real-time voltage to be closed.
Exemplarily, at this time, the first real-time voltage differences of the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 are 10V and 35V, respectively, the first real-time voltage differences of the retired battery cluster 2 and the retired battery cluster 3 are 25V, in the first real-time voltage difference, the first real-time voltage difference 35V of the retired battery cluster 1 and the retired battery cluster 3 is smaller than the maximum voltage difference threshold and larger than the allowable voltage difference threshold, the second battery cluster pair is the retired battery cluster 1 and the retired battery cluster 3, then the second switch device corresponding to the retired battery cluster 3 with the larger first real-time voltage is controlled to be closed, the retired battery cluster 3 is controlled to consume a part of voltage by using the pre-charge resistor, and after a period of time, the first real-time voltage of the retired battery cluster 3 becomes 30V.
And if the plurality of first real-time pressure differences are smaller than the allowable pressure difference threshold value, controlling the first switch devices corresponding to the X retired battery clusters to be closed.
Exemplarily, at this time, the first real-time pressure differences of the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 are 10V and 20V, the first real-time pressure differences of the retired battery cluster 2 and the retired battery cluster 3 are 10V, the plurality of first real-time pressure differences are all smaller than an allowable pressure difference threshold, the energy management device controls the first switch devices corresponding to the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 to be closed, so that the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 charge the load together, and the bidirectional converters corresponding to the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 convert direct current into alternating current.
2. And (3) charging process:
when the processing system for the retired battery in this embodiment meets the charging condition, the energy management device is further specifically configured to determine, according to the second real-time voltage of each retired battery cluster of each retired battery pack in the X retired battery packs obtained in real time, a plurality of second real-time voltage differences between each retired battery cluster of each retired battery pack in the X retired battery packs and each other retired battery cluster in each retired battery pack.
And the energy management device controls the first switch device or the second switch device corresponding to the retired battery cluster in the X retired battery packs to be closed according to the plurality of second real-time pressure differences and the preset maximum pressure difference threshold and allowable pressure difference threshold, wherein the maximum pressure difference threshold is greater than the allowable pressure difference threshold.
Specifically, the energy management device is specifically configured to determine, if a second real-time pressure difference exists among the plurality of second real-time pressure differences and is greater than a maximum pressure difference threshold, a plurality of pairs of third battery cluster pairs corresponding to the second real-time pressure difference greater than the maximum pressure difference threshold; and in each pair of third battery cluster pairs, controlling the first switch device corresponding to the battery cluster with the smaller second real-time voltage to be closed.
For example, the control of a retired battery cluster in a retired battery pack from an energy management device is described below. For example, the processing system for the retired battery in the retired battery pack has three retired battery clusters 1, 2, and 3, wherein the current real-time voltage of the retired battery cluster 1 is 10V, the current real-time voltage of the retired battery cluster 2 is 20V, and the current real-time voltage of the retired battery cluster 3 is 60V; the energy management device obtains that the second real-time pressure difference of the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 is 10V and 50V respectively, and the second real-time pressure difference of the retired battery cluster 2 and the retired battery cluster 3 is 40V.
The maximum differential pressure threshold is 45V, and the allowable differential pressure threshold is 30V; in the second real-time pressure difference, the second real-time pressure difference 50V between the retired battery cluster 1 and the retired battery cluster 3 is greater than the maximum pressure difference threshold, if the third battery cluster pair is the retired battery cluster 1 and the retired battery cluster 3, the first switch device corresponding to the retired battery cluster 1 with the smaller second real-time voltage is controlled to be closed, the power grid is controlled to charge the retired battery cluster 1, and the bidirectional converter corresponding to the retired battery cluster 1 converts alternating current into direct current; after a period of charging, the second real-time voltage of the retired battery cluster 1 becomes 35V.
If a second real-time pressure difference is smaller than the maximum pressure difference threshold and larger than the allowable pressure difference threshold, determining a plurality of pairs of fourth battery cluster pairs corresponding to the second real-time pressure difference smaller than the maximum pressure difference threshold and larger than the allowable pressure difference threshold; and in each pair of fourth battery cluster pairs, controlling the second switch device corresponding to the battery cluster with the smaller second real-time voltage to be closed.
Exemplarily, at this time, the second real-time pressure differences of the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 are 10V and 25V, respectively, the second real-time pressure differences of the retired battery cluster 2 and the retired battery cluster 3 are 40V, in the second real-time pressure difference, the second real-time pressure difference 40V of the retired battery cluster 2 and the retired battery cluster 3 is smaller than the maximum pressure difference threshold and larger than the allowable pressure difference threshold, and the fourth battery cluster pair is the retired battery cluster 2 and the retired battery cluster 3, then the second switch device corresponding to the retired battery cluster 3 with the smaller second real-time voltage is controlled to be closed, the power grid is controlled to charge the retired battery cluster 2 first, and after a period of charging, the second real-time voltage of the retired battery cluster 2 becomes 40V.
And if the second real-time pressure differences are all smaller than the allowable pressure difference threshold value, controlling the first switch devices corresponding to the retired battery clusters in the X retired battery packs to be closed.
Exemplarily, at this time, the second real-time pressure differences of the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 are 15V and 15V, the second real-time pressure differences of the retired battery cluster 2 and the retired battery cluster 3 are 20V, the second real-time pressure differences are all smaller than the allowable pressure difference threshold, the energy management device controls the first switch devices corresponding to the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 to be closed, so that the power grid charges the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 together, and the bidirectional converters corresponding to the retired battery cluster 1, the retired battery cluster 2 and the retired battery cluster 3 convert alternating current into direct current.
In this embodiment, the system for processing a retired battery further includes: the energy management device controls the first switch device or the second switch device corresponding to the corresponding battery cluster to be closed according to the real-time pressure difference of a plurality of retired battery clusters in the charging and discharging process, and charging and discharging of the retired battery clusters are effectively achieved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A system for processing decommissioned batteries, comprising: the system comprises an energy management device, a retired battery device and a bidirectional converter device;
the retired battery device comprises M retired battery clusters, each retired battery cluster consists of a plurality of serially connected retired battery packs, each retired battery cluster is connected with a first end of the bidirectional converter device, a second end of the bidirectional converter device is connected with a power grid, the energy management device is respectively in communication connection with the M retired battery clusters and the bidirectional converter device, and M is an integer greater than 0;
the energy management device is used for controlling the retired battery cluster to charge and discharge;
the decommissioned battery device comprises N decommissioned battery packs;
the energy management device selects X retired battery packs with the residual lives ranked at the top X from the N retired battery packs;
the energy management device is specifically configured to determine, according to a first real-time voltage of each retired battery cluster of each retired battery pack in X retired battery packs acquired in real time, a plurality of first real-time voltage differences between each retired battery cluster of each retired battery pack in the X retired battery packs and each other retired battery cluster in each retired battery pack;
and controlling the closing of a first switch device or a second switch device corresponding to a retired battery cluster in the X retired battery packs according to the plurality of first real-time pressure differences, and a preset maximum pressure difference threshold value and an allowable pressure difference threshold value, wherein the maximum pressure difference threshold value is greater than the allowable pressure difference threshold value.
2. The processing system of claim 1, wherein each of the retired battery packs comprises at least one retired battery cluster, the remaining capacities of the retired battery clusters in the same retired battery pack are the same or have a difference smaller than or equal to a predetermined capacity threshold, and N is an integer greater than 0 and smaller than M.
3. The processing system of claim 2, further comprising: m first switching devices;
each retired battery cluster corresponds to one first switch device, a first end of each first switch device is connected with each retired battery cluster, and a second end of each first switch device is connected with a first end of the bidirectional converter device.
4. The processing system of claim 3, further comprising: m second switching devices and M pre-charging resistors;
each retired battery cluster corresponds to one second switch device and one pre-charging resistor, each retired battery cluster is connected with a first end of each pre-charging resistor, a second end of each pre-charging resistor is connected with a first end of each second switch device, and a second end of each second switch device is connected with a first end of the bidirectional converter device.
5. The processing system of claim 4, wherein the bidirectional converter means comprises N bidirectional converters;
each of the retired battery packs corresponds to one of the bidirectional converters, the second end of each first switching device in each of the retired battery packs is connected with the first end of each of the bidirectional converters, the second end of each second switching device in each of the retired battery packs is connected with the first end of each of the bidirectional converters, and the second end of each of the bidirectional converters is connected with the power grid.
6. The processing system of claim 4, wherein the second end of the bidirectional converter is further connected to a load, and the energy management device is configured to obtain a ranking of the remaining life of the N retired battery packs from large to small, and a required power of the load;
and controlling the first switch devices corresponding to the X retired battery packs to be closed so as to enable the X retired battery packs to charge the load, wherein the sum of the power of the X retired battery packs is greater than the required power of the load, and X is an integer greater than 0.
7. The processing system of claim 1,
the energy management device is specifically configured to determine, if a first real-time pressure difference exists among the plurality of first real-time pressure differences and is greater than the maximum pressure difference threshold, a plurality of pairs of first battery cluster pairs corresponding to the first real-time pressure difference greater than the maximum pressure difference threshold;
in each pair of the first battery cluster, controlling the first switch device corresponding to the retired battery cluster with the larger first real-time voltage to be closed;
if a first real-time pressure difference is smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value, determining a plurality of pairs of second battery cluster pairs corresponding to the first real-time pressure difference smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value;
in each pair of the second battery cluster, controlling the second switch device corresponding to the retired battery cluster with the larger first real-time voltage to be closed;
and if the first real-time pressure differences are all smaller than the allowable pressure difference threshold value, controlling the closing of a first switch device corresponding to a retired battery cluster in the X retired battery packs.
8. The processing system according to claim 5, wherein the energy management device is further configured to determine a plurality of second real-time voltage differences between each retired battery cluster of each retired battery pack of the X retired battery packs and each other retired battery cluster of each retired battery pack of the X retired battery packs according to a second real-time voltage of each retired battery cluster of each retired battery pack of the X retired battery packs acquired in real time;
and controlling the closing of a first switch device or a second switch device corresponding to a retired battery cluster in the X retired battery packs according to the plurality of second real-time pressure differences and preset maximum pressure difference threshold values and allowed pressure difference threshold values, wherein the maximum pressure difference threshold values are larger than the allowed pressure difference threshold values.
9. The processing system of claim 8,
the energy management device is specifically configured to determine, if a second real-time pressure difference exists among the plurality of second real-time pressure differences and is greater than the maximum pressure difference threshold, a plurality of pairs of third battery cluster pairs corresponding to the second real-time pressure difference greater than the maximum pressure difference threshold;
in each pair of the third battery cluster, controlling the first switch device corresponding to the retired battery cluster with the smaller second real-time voltage to be closed;
if a second real-time pressure difference is smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value, determining a plurality of pairs of fourth battery cluster pairs corresponding to the second real-time pressure difference smaller than the maximum pressure difference threshold value and larger than the allowable pressure difference threshold value;
in each pair of the fourth battery cluster, controlling the second switch device corresponding to the retired battery cluster with the smaller second real-time voltage to be closed;
and if the second real-time pressure differences are all smaller than the allowable pressure difference threshold value, controlling the first switching devices corresponding to the retired battery clusters in the X retired battery packs to be closed.
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| CN110504501A (en) * | 2019-08-19 | 2019-11-26 | 国网河北省电力有限公司石家庄供电分公司 | Retired battery Gradient utilization method and system |
| CN111816941A (en) * | 2020-07-22 | 2020-10-23 | 兰州兰石恩力微电网有限公司 | Energy storage integrated system of retired lithium iron phosphate power battery |
| DE102020211748A1 (en) | 2020-09-21 | 2022-03-24 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method of operating batteries |
| CN114336804A (en) * | 2020-09-30 | 2022-04-12 | 蓝谷智慧(北京)能源科技有限公司 | Energy storage system, method and device for retired battery pack |
| CN112871762B (en) * | 2021-04-08 | 2023-03-24 | 湖北亿纬动力有限公司 | Battery echelon utilization method |
| CN116053618B (en) * | 2022-12-30 | 2023-12-05 | 蜂巢能源科技(无锡)有限公司 | Energy storage management system, control method and battery energy storage device |
| CN116995713B (en) * | 2023-09-26 | 2023-12-08 | 江苏华友能源科技有限公司 | Method for utilizing residual electric quantity of retired battery of electric automobile |
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