CN111478396A - Control method for gradient utilization of battery pack - Google Patents
Control method for gradient utilization of battery pack Download PDFInfo
- Publication number
- CN111478396A CN111478396A CN202010358269.2A CN202010358269A CN111478396A CN 111478396 A CN111478396 A CN 111478396A CN 202010358269 A CN202010358269 A CN 202010358269A CN 111478396 A CN111478396 A CN 111478396A
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- Prior art keywords
- battery pack
- battery
- charging
- voltages
- capacity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4264—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing with capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a control method for a battery pack in echelon utilization, and particularly relates to the field of power battery recycling, wherein the method comprises the following steps: s1: disassembling a battery pack of a retired lithium battery, and performing performance evaluation on electrical data such as voltage, temperature, capacity, power and the like of a lithium battery core in the battery pack; s2: according to the data that BMS monitoring system gathered, the lithium cell that is the same with capacity is assembled in groups again according to the capacity size and is new battery package, judges according to electrical data that the battery package gets into the mode of discharging or charging. According to the invention, by arranging the capacitor, the capacitor can discharge the battery pack to improve electric energy in the discharging process, so that the uniform discharging of the battery pack is ensured, the influence on the performance of the battery pack caused by over-discharging of the battery pack is avoided, when the battery pack is charged, the capacitor voltage is equal to the battery pack, and the change of the capacitor voltage can generate the absorption or release of the electric energy, so that the capacity of each battery pack tends to be consistent, and the consistency of the battery packs is improved.
Description
Technical Field
The invention relates to the technical field of power battery recycling, in particular to a control method for a battery pack in echelon utilization.
Background
The power battery retired from the electric automobile generally has a residual capacity of 60-80% of the initial capacity and a certain service life, and at present, there are two main possible treatment methods: one is that the power battery is used in a gradient way, and the retired power battery is used as a carrier of electric energy in other fields such as energy storage, so that the residual value is fully exerted; and secondly, disassembling and recycling, discharging and disassembling the retired battery, and refining raw materials, so that cyclic utilization is realized.
At present, a plurality of battery packs are required to be connected in parallel for use in order to meet the capacity requirement when the battery packs meeting the echelon utilization requirement are directly and wholly applied to high-capacity products such as an energy storage station or a mobile charging car. The method is generally adopted to directly connect qualified ex-service battery packs to a power unit in series and parallel for charging and discharging. The problem that this brings is that, as the use time increases, the inconsistency of the retired battery pack can be shown very fast, the actual performance of the battery pack in the echelon can not be fully exerted, and danger is extremely easily caused.
Disclosure of Invention
In order to overcome the above-mentioned defects in the prior art, an embodiment of the present invention provides a method for controlling a battery pack in a echelon utilization manner, and the problems to be solved by the present invention are: the inconsistency of the battery pack can not fully exert the actual performance of the battery pack in the echelon, and is very easy to cause danger.
In order to achieve the purpose, the invention provides the following technical scheme: a control method for utilizing battery packs in a echelon mode comprises the following steps:
s1: disassembling a battery pack of a retired lithium battery, and performing performance evaluation on electrical data such as voltage, temperature, capacity, power and the like of a lithium battery core in the battery pack;
s2: according to data collected by a BMS monitoring system, inserting and connecting lithium cells with the same capacity according to the capacity, re-grouping and assembling the lithium cells into a new battery pack, setting the four battery packs into A, B, C and D, judging whether the battery pack enters a discharging or charging mode according to electrical data, entering S3 when the battery pack enters the discharging mode, and entering S4 when the battery pack enters the charging mode;
s3: comparing A, B, C and D four groups of battery pack voltage with the threshold value, if the battery pack voltage is higher than the threshold value, the battery pack continues to discharge, if the battery pack voltage is lower than the threshold value, the battery pack stops discharging;
s4: the limiting circuit and the charging circuit are both started, the limiting circuit limits the charging current of the charging circuit to be below 0.24C, the charging circuit charges the battery pack, the voltages of the four capacitors are compared, if the voltages of the four capacitors are different, the charging is continued, and if the voltages are the same, the charging is stopped.
In a preferred embodiment, the discharge mode is specifically:
2.1 comparing the voltages of the battery pack A, B, C and the four battery packs D with the threshold value, if the voltages of the battery packs A, B, C and D are both higher than the threshold value, the contact switch SA can be connected with any one battery pack circuit in a closed manner;
2.2 if the voltage of any battery pack is lower than the threshold value, the contact switch SA can be connected with any line except the battery pack in a closed manner;
2.3 if the voltages of any two battery packs are lower than the threshold value, the contact switch SA can be connected with any one line of the other two battery packs in a closed manner;
2.4 if the voltage of the battery pack A, B, C and the four-pack battery pack D are both below the threshold, then the charging mode needs to be entered.
In a preferred embodiment, the charging mode is specifically:
3.1, the control switches k1, k2, k3 and k4 are closed, the contact switch SA is opened, and the charging circuit charges the battery pack;
3.2 comparing the voltages of the capacitors c1, c2, c3 and c4, if the voltages of the capacitors c1, c2, c3 and c4 are different, continuing charging, and if the voltages of the capacitors c1, c2, c3 and c4 are the same, stopping charging.
In a preferred embodiment, the battery packs A, B, C and D are electrically connected to the charging circuit U, the battery packs A, B, C and D are sequentially connected in series, capacitors are connected in parallel to positive and negative ends of the battery packs A, B, C and D, and the capacitors c1, c2, c3 and c4 are arranged in one-to-one correspondence with the battery packs A, B, C and D.
In a preferred embodiment, the load circuit M is electrically connected to the input contacts of the contact switch SA, and the line nodes between the battery packs a and B, B and C, C and D are each wired with wires 1, 2 and 3, and the wires 1, 2 and 3 are respectively electrically connected to the three output contacts of the contact switch SA.
The invention has the technical effects and advantages that:
1. according to the invention, the capacitor is arranged, in the discharging process, the capacitor can discharge the battery pack to improve the electric energy, the uniform discharging of the battery pack is ensured, the influence on the performance of the battery pack caused by over-discharging of the battery pack is avoided, when the battery pack is charged, the capacitor voltage is equal to the battery pack, and the change of the capacitor voltage can generate the absorption or release of the electric energy, so that the capacity of each battery pack tends to be consistent, the consistency of the battery pack is convenient to improve, compared with the prior art, the actual performance of the echelon battery pack is fully exerted, and the danger is avoided;
2. the invention is convenient to form a parallel circuit among the battery packs by arranging the control switch and the contact switch, is convenient to form the combination of the trapezoidal battery packs to provide electric energy for the load circuit, improves the practicability, and has the progress of being convenient to combine the batteries to provide electric energy for the load circuit according to actual requirements compared with the prior art.
Drawings
FIG. 1 is a schematic flow chart of a control method of the present invention;
fig. 2 is a schematic diagram of the circuit structure of the battery pack according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The echelon utilization battery pack control method in the embodiment of the invention refers to the accompanying drawings 1 and 2 of the specification, and the echelon utilization battery pack control method in the embodiment adopts the following steps:
s1: disassembling a battery pack of a retired lithium battery, and performing performance evaluation on electrical data such as voltage, temperature, capacity, power and the like of a lithium battery core in the battery pack;
s2: according to data collected by a BMS monitoring system, inserting and connecting lithium cells with the same capacity according to the capacity, re-grouping and assembling the lithium cells into a new battery pack, setting the four battery packs into A, B, C and D, judging whether the battery pack enters a discharging or charging mode according to electrical data, entering S3 when the battery pack enters the discharging mode, and entering S4 when the battery pack enters the charging mode;
s3: comparing A, B, C and D four groups of battery pack voltage with the threshold value, if the battery pack voltage is higher than the threshold value, the battery pack continues to discharge, if the battery pack voltage is lower than the threshold value, the battery pack stops discharging;
s4: the limiting circuit and the charging circuit are both started, the limiting circuit limits the charging current of the charging circuit to be below 0.24C, the charging circuit charges the battery pack, the voltages of the four capacitors are compared, if the voltages of the four capacitors are different, the charging is continued, and if the voltages are the same, the charging is stopped.
As shown in fig. 1-2, the implementation scenario specifically includes: when in actual use, break up the decommissioning lithium cell package earlier, carry out the performance aassessment to the electrical data of its inside lithium cell, if the data aassessment of lithium cell is qualified, the lithium cell can continue to use promptly, with the little lithium cell of difference with the mode of alternating interlude again in groups assemble into new battery package according to the capacity size of lithium cell, the meaning of alternating interlude does: firstly, measuring the average capacity of the capacities of lithium cores forming a battery pack, according to the arrangement position of the lithium cores distributed with the average capacity, arranging the lithium cores with the capacity higher than the average capacity at two sides of the lithium cores with the capacity higher than the average capacity, arranging the lithium cores with the capacity lower than the average capacity at two sides of the lithium cores with the capacity higher than the average capacity, connecting each battery pack with a charging circuit U and a load circuit M in a connection mode shown in figure 2, disconnecting a contact switch SA when the battery pack discharges, controlling a control switch k on a corresponding circuit according to the judgment of the voltage and the threshold value of the battery pack to enable the load circuit M to be connected with different battery packs so as to output electric energy with different steps, and arranging a capacitor c, wherein in the discharging process, the capacitor c can discharge the battery pack to improve the electric energy, the uniform discharge of the battery pack is ensured, the over-discharge of the battery pack is avoided, the performance, electric capacity c charges, the electric capacity voltage is equal with the battery package, the absorption or the release of electric energy can be produced in electric capacity voltage's change, thereby make the capacity of battery package A, B, C and D tend towards unanimity, through this principle, also series connection electric capacity c between the two poles of the earth with the lithium cell in the battery package, make the capacity of the inside lithium cell of battery package also tend towards unanimity, thereby improve the uniformity of battery package, the actual performance of full play echelon battery package, still avoid causing danger, the problem that can't full play echelon battery package actual performance that exists among the prior art has specifically been solved to this embodiment.
The discharge mode is specifically as follows:
2.1 comparing the voltages of the battery pack A, B, C and the four battery packs D with the threshold value, if the voltages of the battery packs A, B, C and D are both higher than the threshold value, the contact switch SA can be connected with any one battery pack circuit in a closed manner;
2.2 if the voltage of any battery pack is lower than the threshold value, the contact switch SA can be connected with any line except the battery pack in a closed manner;
2.3 if the voltages of any two battery packs are lower than the threshold value, the contact switch SA can be connected with any one line of the other two battery packs in a closed manner;
2.4 if the voltage of the battery pack A, B, C and the four-pack battery pack D are both below the threshold, then the charging mode needs to be entered.
The charging mode specifically comprises the following steps:
3.1, the control switches k1, k2, k3 and k4 are closed, the contact switch SA is opened, and the charging circuit charges the battery pack;
3.2 comparing the voltages of the capacitors c1, c2, c3 and c4, if the voltages of the capacitors c1, c2, c3 and c4 are different, continuing charging, and if the voltages of the capacitors c1, c2, c3 and c4 are the same, stopping charging.
Battery package A, B, C and D all with charging circuit U electric connection, just it sets up to establish ties in proper order between battery package A, B, C and the D, just battery package A, B, C and D's positive and negative both ends all are parallelly connected to be provided with the electric capacity, and electric capacity c1, c2, c3 and c4 and battery package A, B, C and D one-to-one setting.
The load circuit M is electrically connected with the input contact of the contact switch SA, and the line nodes between the battery packs a and B, B and C, C and D are all connected with the wires 1, 2 and 3 through wires, and the wires 1, 2 and 3 are respectively electrically connected with the three output contacts of the contact switch SA.
As shown in fig. 1-2, the implementation scenario specifically includes: during practical use, by arranging the wires 1, 2 and 3, the control switches k1, k2, k3, k4 and the contact switch SA, a parallel circuit is conveniently formed between the battery packs A, B, C and D, the trapezoidal battery packs are conveniently formed to be combined to provide electric energy for the load circuit U, the practicability is improved, and the problem that the combined batteries are convenient to provide electric energy for the load circuit according to actual needs in the prior art is specifically solved by the embodiment.
In summary, the following steps: according to the invention, the capacitor c is arranged, so that the battery pack can be discharged by the capacitor c in the discharging process to improve the electric energy, the uniform discharging of the battery pack is ensured, the influence on the performance of the battery pack caused by over-discharging of the battery pack is avoided, when the battery pack is charged, the capacitor c is charged, the capacitor voltage is equal to the battery pack, and the change of the capacitor voltage can generate the absorption or release of the electric energy, so that the capacities of the battery packs A, B, C and D tend to be consistent.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (5)
1. A control method for utilizing a battery pack in a echelon manner is characterized by comprising the following steps:
s1: disassembling a battery pack of a retired lithium battery, and performing performance evaluation on electrical data such as voltage, temperature, capacity, power and the like of a lithium battery core in the battery pack;
s2: according to data collected by a BMS monitoring system, inserting and connecting lithium cells with the same capacity according to the capacity, re-grouping and assembling the lithium cells into a new battery pack, setting the four battery packs into A, B, C and D, judging whether the battery pack enters a discharging or charging mode according to electrical data, entering S3 when the battery pack enters the discharging mode, and entering S4 when the battery pack enters the charging mode;
s3: comparing A, B, C and D four groups of battery pack voltage with the threshold value, if the battery pack voltage is higher than the threshold value, the battery pack continues to discharge, if the battery pack voltage is lower than the threshold value, the battery pack stops discharging;
s4: the limiting circuit and the charging circuit are both started, the limiting circuit limits the charging current of the charging circuit to be below 0.24C, the charging circuit charges the battery pack, the voltages of the four capacitors are compared, if the voltages of the four capacitors are different, the charging is continued, and if the voltages are the same, the charging is stopped.
2. The echelon utilization battery pack control method according to claim 1, characterized in that: the discharge mode is specifically as follows:
2.1 comparing the voltages of the battery pack A, B, C and the four battery packs D with the threshold value, if the voltages of the battery packs A, B, C and D are both higher than the threshold value, the contact switch SA can be connected with any one battery pack circuit in a closed manner;
2.2 if the voltage of any battery pack is lower than the threshold value, the contact switch SA can be connected with any line except the battery pack in a closed manner;
2.3 if the voltages of any two battery packs are lower than the threshold value, the contact switch SA can be connected with any one line of the other two battery packs in a closed manner;
2.4 if the voltage of the battery pack A, B, C and the four-pack battery pack D are both below the threshold, then the charging mode needs to be entered.
3. The echelon utilization battery pack control method according to claim 1, characterized in that: the charging mode specifically comprises the following steps:
3.1, the control switches k1, k2, k3 and k4 are closed, the contact switch SA is opened, and the charging circuit charges the battery pack;
3.2 comparing the voltages of the capacitors c1, c2, c3 and c4, if the voltages of the capacitors c1, c2, c3 and c4 are different, continuing charging, and if the voltages of the capacitors c1, c2, c3 and c4 are the same, stopping charging.
4. The echelon utilization battery pack control method according to claim 1, characterized in that: battery package A, B, C and D all with charging circuit U electric connection, just it sets up to establish ties in proper order between battery package A, B, C and the D, just battery package A, B, C and D's positive and negative both ends all are parallelly connected to be provided with the electric capacity, and electric capacity c1, c2, c3 and c4 and battery package A, B, C and D one-to-one setting.
5. The echelon utilization battery pack control method according to claim 1, characterized in that: the load circuit M is electrically connected with the input contact of the contact switch SA, and the line nodes between the battery packs a and B, B and C, C and D are all connected with the wires 1, 2 and 3 through wires, and the wires 1, 2 and 3 are respectively electrically connected with the three output contacts of the contact switch SA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358269.2A CN111478396A (en) | 2020-04-29 | 2020-04-29 | Control method for gradient utilization of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358269.2A CN111478396A (en) | 2020-04-29 | 2020-04-29 | Control method for gradient utilization of battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN111478396A true CN111478396A (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010358269.2A Withdrawn CN111478396A (en) | 2020-04-29 | 2020-04-29 | Control method for gradient utilization of battery pack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116316769A (en) * | 2023-05-23 | 2023-06-23 | 广东天枢新能源科技有限公司 | Storage and charging method and system based on echelon utilization of retired battery packs |
-
2020
- 2020-04-29 CN CN202010358269.2A patent/CN111478396A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116316769A (en) * | 2023-05-23 | 2023-06-23 | 广东天枢新能源科技有限公司 | Storage and charging method and system based on echelon utilization of retired battery packs |
| CN116316769B (en) * | 2023-05-23 | 2023-09-26 | 广东天枢新能源科技有限公司 | Storage and charging method and system based on echelon utilization of retired battery packs |
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Application publication date: 20200731 |