CN111969263A - Method and device for updating SOH of battery pack in charging and replacing power station - Google Patents

Method and device for updating SOH of battery pack in charging and replacing power station Download PDF

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Publication number
CN111969263A
CN111969263A CN202010700149.6A CN202010700149A CN111969263A CN 111969263 A CN111969263 A CN 111969263A CN 202010700149 A CN202010700149 A CN 202010700149A CN 111969263 A CN111969263 A CN 111969263A
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China
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battery pack
charging
soh
preset
controller
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Granted
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CN202010700149.6A
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CN111969263B (en
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马增
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Zhejiang Geely Holding Group Co Ltd
Zhejiang Jizhi New Energy Automobile Technology Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Zhejiang Jizhi New Energy Automobile Technology Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/80—Exchanging energy storage elements, e.g. removable batteries
    • 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
    • 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
    • H01M10/448—End of discharge regulating measures
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

The invention provides a method for updating a battery pack SOH of a charging and replacing power station, which comprises the following steps: the battery pack to be tested sends an SOH updating instruction to the master controller; the master controller sends a maintenance instruction to the battery pack to be tested; starting a discharge mode of the battery pack to be tested, so that each single battery pack starts to discharge at a preset first current threshold; acquiring the discharge voltage of each single battery pack, and stopping discharging when one of the discharge voltages is smaller than a preset voltage threshold; starting a charging mode after a first time threshold is preset, so that each single battery is charged at a preset second current threshold; acquiring a charging voltage value of each single battery pack, and stopping charging when the highest charging voltage value in the single battery packs is larger than a preset second voltage threshold value; and determining the actual charging capacity according to the charging time and the charging current, and updating the SOH according to the actual charging capacity. The method improves the SOH precision and reduces the difference between the displayed endurance mileage and the actual endurance mileage.

Description

Method and device for updating SOH of battery pack in charging and replacing power station
Technical Field
The invention relates to the technical field of charging and replacing power stations, in particular to a method and a device for updating a battery pack SOH of a charging and replacing power station.
Background
The new energy pure electric automobile has a common weakness problem at present: the endurance mileage is estimated inaccurately, for example, the estimated endurance mileage is 100km, and the vehicle can only actually run for 50km, and is forced to stop in the midway, so that customer complaints and complaints are caused, and the popularization and the application of the new energy vehicle are greatly hindered.
The root cause of inaccurate estimation of the cruising range is inaccurate estimation of the SOC (State of Charge), the main cause of inaccurate estimation of the SOC is inaccurate estimation of the SOH (State of health), and if a certain method, a control strategy and the like are adopted to improve the SOH estimation accuracy, the SOC estimation accuracy is correspondingly improved.
At present, the precision method for estimating SOH in the industry mainly comprises the following steps:
1. the decay curve of the battery life over time given by the battery manufacturer is used for estimation.
2. And estimating by using a battery charge-discharge cycle life curve given by a battery manufacturer.
However, no matter which algorithm is adopted, the SOH is an estimated value, and the estimation precision in the industry is about 10% generally at present. The use requirements of users cannot be well met.
The actual SOH of the battery is small due to external reasons (such as looseness of a post connecting copper bar), the current detection method cannot identify, and finally an SOH error is introduced to further reduce the SOH precision. The cell may have further reduced SOH accuracy due to inconsistent internal polarization and inconsistent attenuation.
The reduction of the SOH accuracy directly affects the discrepancy between the displayed driving range and the actual driving range of the vehicle, such as: the endurance mileage is displayed to be 100km, and the actual driving can only be 80 km.
Therefore, a technical scheme of a method for updating the SOH of the battery pack by the battery charging and replacing station is urgently needed to be provided, so that the SOH of the battery can be accurately calibrated, and the user experience is improved.
Disclosure of Invention
In order to solve the above problem, the present invention provides a method for updating a battery pack SOH in a charging and replacing station, where the method includes:
the method comprises the steps that a battery pack to be tested sends an SOH updating instruction to a master controller, wherein the SOH updating instruction is sent by the battery pack to be tested autonomously or based on an SOH updating request sent by the master controller;
the master controller starts a bidirectional AC-to-DC controller and a bidirectional DC-to-DC controller according to an SOH updating instruction sent by the battery pack to be tested, and sends a maintenance instruction to the battery pack to be tested;
the battery pack to be tested controls the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller to start a discharging mode based on the received maintenance instruction, so that each single battery pack starts to discharge at a preset first current threshold; acquiring the discharge voltage of each single battery pack, and stopping discharging when one of the discharge voltages is smaller than a preset voltage threshold; after a first time threshold value is preset, the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller are controlled to start a charging mode, so that each single battery is charged at a preset second current threshold value; acquiring a charging voltage value of each single battery pack, and stopping charging when the highest charging voltage value in the single battery packs is larger than a preset second voltage threshold value; and determining the actual charging capacity according to the charging time and the charging current, and updating the SOH according to the actual charging capacity.
Further, still include:
the battery pack to be detected sends a physical examination request instruction to the master controller, wherein the physical examination request instruction is sent by the battery pack to be detected autonomously or based on a physical examination request sent by the master controller;
the master controller controls the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a physical examination mode based on the received physical examination request instruction, and sends a physical examination instruction to the battery pack to be detected;
the battery pack to be tested controls the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a discharging mode based on the received physical examination instruction, so that each single battery pack starts to discharge at a preset first current threshold value and is preset, and each single battery pack discharges at a preset first current threshold value and is preset with a second time threshold value; acquiring a voltage difference and a current difference of each single battery after discharging; determining the current impedance corresponding to the single battery according to the voltage difference and the current difference; judging whether the current impedance is larger than a preset rated impedance threshold value or not; and if so, determining that the single battery pack is unhealthy.
Further, the determining an actual charging capacity according to the charging time and the charging current, and updating the SOH according to the actual charging capacity, previously includes:
acquiring the rated capacity of the battery pack to be tested;
accordingly, the SOH is updated according to the rated capacity and the actual charging capacity.
Further, still include:
and if the number of the unhealthy single battery packs is larger than a preset number threshold value, determining that the battery packs to be tested are unhealthy.
In another aspect, the present invention provides an apparatus for updating an SOH of a battery pack in a charging and replacing power station, including:
the system comprises an update instruction sending module, a master controller and a service module, wherein the update instruction sending module is used for sending an SOH update instruction to a battery pack to be tested to the master controller, and the SOH update instruction is sent by the battery pack to be tested autonomously or based on an SOH update request sent by the master controller;
the maintenance instruction sending module is used for starting the bidirectional AC-DC conversion controller and the bidirectional DC-DC conversion controller according to the SOH updating instruction sent by the battery pack to be tested by the master controller and sending a maintenance instruction to the battery pack to be tested;
the first discharging module is used for controlling the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller to start a discharging mode based on the received maintenance instruction by the battery pack to be tested so that each single battery pack starts to discharge at a preset first current threshold;
the discharge stopping module is used for acquiring the discharge voltage of each single battery pack, and stopping discharging when one of the discharge voltages is smaller than a preset voltage threshold;
the charging module is used for controlling the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a charging mode after a first time threshold is preset, so that each single battery is charged at a preset second current threshold;
the charging stopping module is used for acquiring the charging voltage value of each single battery pack, and stopping charging when the highest charging voltage value in the single battery packs is larger than a preset second voltage threshold value;
and the updating module is used for determining the actual charging capacity according to the charging time and the charging current and updating the SOH according to the actual charging capacity.
Further, still include:
a physical examination instruction sending module, configured to send a physical examination request instruction to the master controller, where the physical examination request instruction is sent by the battery pack to be tested autonomously or based on a physical examination request sent by the master controller;
a physical examination instruction sending module, configured to control, by the master controller, the bidirectional ac-to-dc converter and the bidirectional dc-to-dc converter to start a physical examination mode based on the received physical examination request instruction, and send a physical examination instruction to the battery pack to be tested;
the second discharging module is used for controlling the bidirectional alternating current-to-direct current controller and the bidirectional direct current-to-direct current controller to start a discharging mode based on the received physical examination instruction, so that each single battery pack starts to discharge at a preset first current threshold value, and each single battery pack discharges at the preset first current threshold value for a preset second time threshold value;
the current impedance determining module is used for acquiring the voltage difference and the current difference of each single battery after discharging; determining the current impedance corresponding to the single battery according to the voltage difference and the current difference;
the battery pack unhealthy determining module is used for judging whether the current impedance is greater than a preset rated impedance threshold value; and if so, determining that the single battery pack is unhealthy.
Further, still include:
and the battery pack unhealthy determining module is used for determining that the battery pack to be tested is unhealthy if the number of the unhealthy single battery packs is greater than a preset number threshold.
In another aspect, the present invention provides a server, which includes a processor and a memory, where at least one instruction, at least one program, a code set, or a set of instructions is stored in the memory, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by the processor to implement the method for updating the battery pack SOH by the charging station as described above.
In another aspect, the present invention provides a computer-readable storage medium having at least one instruction, at least one program, a set of codes, or a set of instructions stored therein, which is loaded and executed by a processor to implement the method for updating the SOH of the battery pack by the charging station as described above.
On the other hand, the invention provides a charging and replacing power station which is provided with a charging and replacing power system, wherein the charging and replacing power system comprises the device for updating the SOH of the battery pack of the charging and replacing power station.
Due to the technical scheme, the invention has the following beneficial effects:
the SOH of the invention is a calculation result, is not an estimation result, can automatically and periodically calibrate the SOH, controls the SOH precision within 1 percent, improves the SOH calculation precision, and reduces the difference between the displayed endurance mileage and the actual endurance mileage.
The power battery can attenuate in the use, because vibrations etc. probably cause the internal fixation screw of battery package not hard up, because long-term the use, probably lead to the battery polarization inconsistent, lead to the cask effect, introduce regular automatic execution battery physical examination, but the internal or external problem of battery that the physical examination finds leads to the life-span decay to can in time maintain the battery, improve battery life, accurate discernment and report the internal polarization of battery or connect the health index decline problem that the harmfully leads to.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a structural diagram of a charging and swapping station system according to an embodiment of the present invention;
fig. 2 is a structural diagram of another charging and swapping station system according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for updating an SOH of a battery pack by a charging and swapping station according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for updating the SOH of the battery pack by the charging and replacing station according to another embodiment of the present invention;
fig. 5 is a block diagram of an apparatus for updating an SOH of a battery pack in a charging and replacing station according to an embodiment of the present invention;
fig. 6 is a block diagram of another apparatus for updating the SOH of the battery pack in the charging and replacing station according to the embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Fig. 1 is a system structure diagram of a charging and swapping station according to an embodiment of the present invention, and as shown in fig. 1, an implementation environment of a method for updating a battery pack SOH in a charging and swapping station according to the present invention may include: the interconnect fills and trades power station and awaits measuring battery package, it includes to fill and trade the power station: voltage source, total controller, two-way interchange change direct current controller, two-way direct current change direct current controller, total controller with two-way interchange changes direct current controller communication connection, two-way interchange change direct current controller with two-way direct current changes direct current controller communication connection, two-way direct current change direct current controller with await measuring battery package communication connection, the voltage source with two-way interchange changes direct current controller electricity and is connected, two-way interchange change direct current controller with two-way direct current changes direct current controller electricity and is connected, two-way direct current change direct current controller electricity still with await measuring battery package electricity is connected. The voltage source can be used as a charging power source of the battery pack to be tested and can also be used as a load of the battery pack to be tested. The battery pack to be tested includes: a plurality of series-connected cell stacks. The operating parameters of the cell battery, such as the rated voltage, the rated current, and the like, are not specifically limited in the embodiments of the present specification, and the operating parameters of each cell battery may also be different. The master controller and the battery pack to be tested can control the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller to realize different working modes. In fig. 1 and 2, the dotted lines represent communication connections, and the solid lines represent electrical connections.
In some possible embodiments, an implementation environment of the method for updating the SOH of the battery pack by the charging and swapping station of the present invention may also be as shown in fig. 2, where fig. 2 is a system structure diagram of another charging and swapping station provided in the embodiments of the present invention, and a specific connection principle is the same as that in fig. 1, and is not described herein again.
Fig. 3 is a flowchart of a method for updating an SOH of a battery pack by a charging and swapping station according to an embodiment of the present invention. As shown in fig. 3, the method includes:
s102, sending an SOH updating instruction to a master controller by a battery pack to be tested, wherein the SOH updating instruction is sent by the battery pack to be tested independently or based on an SOH updating request sent by the master controller;
specifically, after the battery pack to be tested is connected according to fig. 1 or fig. 2, the battery pack to be tested may send an SOH update instruction to the master controller based on the user input, and the SOH update instruction may be used by the master controller to turn on the bidirectional ac-to-dc controller and the bidirectional dc-to-dc controller. In some possible embodiments, the SOH update instruction may also be sent by the battery pack under test based on an SOH update request sent by the overall controller.
S104, the master controller starts a bidirectional AC-to-DC controller and a bidirectional DC-to-DC controller according to an SOH updating instruction sent by the battery pack to be tested, and sends a maintenance instruction to the battery pack to be tested;
specifically, the master controller can control the bidirectional ac-to-dc controller and the bidirectional dc-to-dc controller after receiving the SOH update instruction, and certainly, the bidirectional ac-to-dc controller and the bidirectional dc-to-dc controller are not operated before the master controller controls the bidirectional ac-to-dc controller and the bidirectional dc-to-dc controller. The master controller can feed back the maintenance instruction to the battery pack to be tested through the communication line.
S106, the battery pack to be tested controls the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller to start a discharging mode based on the received maintenance instruction, so that each single battery pack starts to discharge at a preset first current threshold; acquiring the discharge voltage of each single battery pack, and stopping discharging when one of the discharge voltages is smaller than a preset voltage threshold; after a first time threshold value is preset, the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller are controlled to start a charging mode, so that each single battery is charged at a preset second current threshold value; acquiring a charging voltage value of each single battery pack, and stopping charging when the highest charging voltage value in the single battery packs is larger than a preset second voltage threshold value; determining an actual charging capacity according to the charging time and the charging current, and updating the SOH according to the actual charging capacity;
specifically, the battery pack to be tested can control the bidirectional AC-DC controller and the bidirectional DC-DC controller in a communication mode or an electric signal mode due to the bidirectional AC-DC controller and the bidirectional DC-DC controller. After the battery pack to be tested receives the maintenance instruction, the battery pack to be tested can control the bidirectional AC-DC converter and the bidirectional DC-DC converter to start a discharging mode, so that each single battery pack starts to discharge at a preset first current threshold.
It should be noted that, in the discharging mode, the bidirectional dc-to-dc converter may convert the first dc voltage of the battery pack to be tested into the second dc voltage, and the bidirectional ac-to-dc converter may convert the second dc voltage into the ac voltage when the vehicle voltage source is used as the load. Working parameters and connection modes of the bidirectional ac-to-dc controller and the bidirectional dc-to-dc controller are not specifically limited in the embodiments of the present specification, and the preset first current threshold may also be set according to actual needs. Preferably, the predetermined first current threshold is 0.02Ca-1 Ca.
Specifically, the battery pack to be tested can obtain the discharge voltage of each single battery pack in real time, and when one of the discharge voltages is smaller than a preset voltage threshold, the discharge is stopped. The preset voltage threshold value can be determined according to the rated voltage of the single battery pack, and the preferable interval is 1-3.5V.
Specifically, the battery pack to be tested may have a timing function, the timing function is performed after the discharge is stopped, the charging mode is started and the timing is started after the first time threshold is preset, in the charging mode, the voltage source is used as a charging power source to charge the battery pack to be tested, and the current flow directions of the corresponding bidirectional ac-to-dc controller and the bidirectional dc-to-dc controller are switched to the opposite flow direction of the discharging mode. The preset first time threshold is not specifically limited in the embodiments of the present specification, and is preferably 0 to 100 min; the second current threshold is preferably preset to 0.02Ca-1 Ca.
Specifically, the battery pack to be tested can monitor the voltage value of each single battery pack in real time, and when the voltage value of a certain single battery pack is monitored to be larger than a preset second voltage threshold value, the bidirectional alternating current-to-direct current controller and the bidirectional direct current-to-direct current controller are controlled to stop charging. The preset second voltage threshold may be 2-5V.
Specifically, the actual charging capacity of the battery pack to be tested can be calculated according to the charging time and the charging current.
In the prior art, only SOH is estimated, and estimation is performed based on a life estimation curve given by a battery manufacturer at normal temperature, the accuracy can be generally controlled to be about 10% and the battery cannot be subjected to physical examination, once the service life of the battery is attenuated due to internal or external problems of the battery, the battery cannot be identified and maintained, and the problems are brought into SOH estimation to cause a larger estimation error of SOH; in the method for updating the SOH of the battery pack by the charging and discharging station provided by the embodiment of the specification, the SOH value of the battery pack to be tested is updated through charging and discharging of the battery pack to be tested, and the SOH is a calculation result and is not an estimation result, so that the SOH can be automatically and periodically calibrated, and the SOH precision is controlled within 1%.
On the basis of the foregoing embodiments, in an embodiment of this specification, fig. 4 is a flowchart of a method for updating an SOH of a battery pack by a charging and replacing station according to another embodiment of the present invention; as shown in fig. 4, the method further comprises:
s202, the battery pack to be detected sends a physical examination request instruction to the master controller, wherein the physical examination request instruction is sent by the battery pack to be detected autonomously or based on a physical examination request sent by the master controller;
specifically, the battery pack to be tested may further send a physical examination request instruction based on the user input, where the physical examination request may be used to monitor the health status of the battery pack to be tested.
S204, the master controller controls the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a physical examination mode based on the received physical examination request instruction, and sends a physical examination instruction to the battery pack to be detected;
specifically, the master controller controls to start the bidirectional ac-to-dc controller and the bidirectional dc-to-dc controller to enter a physical examination mode after receiving a physical examination request.
S206, the battery pack to be tested controls the bidirectional alternating current-to-direct current controller and the bidirectional direct current-to-direct current controller to start a discharging mode based on the received physical examination instruction, so that each single battery pack starts to discharge at a preset first current threshold value, and each single battery pack discharges at a preset first current threshold value for a preset second time threshold value; acquiring a voltage difference and a current difference of each single battery after discharging; determining the current impedance corresponding to the single battery according to the voltage difference and the current difference; judging whether the current impedance is larger than a preset rated impedance threshold value or not; and if so, determining that the single battery pack is unhealthy.
It should be noted that the preset first current threshold may be 1Ca to 10Ca, and the preset second time threshold may be 0.01 to 10 s.
Specifically, after the battery pack to be tested discharges, the battery pack to be tested may determine each voltage difference and current difference after the discharge of the single battery, and calculate the current impedance of each electrical connection and the battery pack node inside the battery pack to be tested, and may calculate by using Rn ═ Δ Un/Δ I, where Rn: nth electrical connection and cell impedance, Δ Un: voltage difference before and after nth electrical connection and battery discharge, Δ I: current difference before and after discharge.
Specifically, the battery pack to be tested may compare the Rn calculation result with an actual delivery value (i.e., a preset rated impedance threshold), and determine whether the battery is healthy or not and whether maintenance is required. And when the difference value between the current impedance and the preset rated impedance threshold is larger than m, determining that the health degree of the single battery pack is reduced and needing maintenance. Wherein, m takes the value: 0 to 1000 milliohms.
The battery pack to be tested can generate electric quantity attenuation in the using process, the looseness of a fixing screw in the battery pack can be caused, the battery polarization is possibly inconsistent due to long-term use, and the wooden barrel effect is caused.
On the basis of the foregoing embodiments, in an embodiment of the present specification, the determining an actual charging capacity according to a charging time and the charging current, and updating the SOH according to the actual charging capacity further includes:
acquiring the rated capacity of the battery pack to be tested;
accordingly, the SOH is updated according to the rated capacity and the actual charging capacity.
Specifically, the SOH may be determined by a ratio of an actual charge capacity to a rated capacity.
On the basis of the above embodiments, in an embodiment of the present specification, the method further includes:
and if the number of the unhealthy single battery packs is larger than a preset number threshold value, determining that the battery packs to be tested are unhealthy.
For example, when the battery pack to be tested has 10 single battery packs, and more than 4 single battery packs are in an unhealthy state, it may be determined that the battery pack to be tested is in the unhealthy state.
The embodiment of the present invention further provides a device for updating a battery pack SOH of a charging and swapping station, as shown in fig. 5, fig. 5 is a block diagram of the device for updating a battery pack SOH of a charging and swapping station according to the embodiment of the present invention; the device comprises:
the system comprises an update instruction sending module, a master controller and a service module, wherein the update instruction sending module is used for sending an SOH update instruction to a battery pack to be tested to the master controller, and the SOH update instruction is sent by the battery pack to be tested autonomously or based on an SOH update request sent by the master controller;
the maintenance instruction sending module is used for starting the bidirectional AC-DC conversion controller and the bidirectional DC-DC conversion controller according to the SOH updating instruction sent by the battery pack to be tested by the master controller and sending a maintenance instruction to the battery pack to be tested;
the first discharging module is used for controlling the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller to start a discharging mode based on the received maintenance instruction by the battery pack to be tested so that each single battery pack starts to discharge at a preset first current threshold;
the discharge stopping module is used for acquiring the discharge voltage of each single battery pack, and stopping discharging when one of the discharge voltages is smaller than a preset voltage threshold;
the charging module is used for controlling the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a charging mode after a first time threshold is preset, so that each single battery is charged at a preset second current threshold;
the charging stopping module is used for acquiring the charging voltage value of each single battery pack, and stopping charging when the highest charging voltage value in the single battery packs is larger than a preset second voltage threshold value;
and the updating module is used for determining the actual charging capacity according to the charging time and the charging current and updating the SOH according to the actual charging capacity.
On the basis of the foregoing embodiment, in an embodiment of this specification, fig. 6 is a block diagram of a device for updating a battery pack SOH of a charging and replacing station according to another embodiment of the present invention; as shown in fig. 6, the apparatus further includes:
a physical examination instruction sending module, configured to send a physical examination request instruction to the master controller, where the physical examination request instruction is sent by the battery pack to be tested autonomously or based on a physical examination request sent by the master controller;
a physical examination instruction sending module, configured to control, by the master controller, the bidirectional ac-to-dc converter and the bidirectional dc-to-dc converter to start a physical examination mode based on the received physical examination request instruction, and send a physical examination instruction to the battery pack to be tested;
the second discharging module is used for controlling the bidirectional alternating current-to-direct current controller and the bidirectional direct current-to-direct current controller to start a discharging mode based on the received physical examination instruction, so that each single battery pack starts to discharge at a preset first current threshold value, and each single battery pack discharges at the preset first current threshold value for a preset second time threshold value;
the current impedance determining module is used for acquiring the voltage difference and the current difference of each single battery after discharging; determining the current impedance corresponding to the single battery according to the voltage difference and the current difference;
the battery pack unhealthy determining module is used for judging whether the current impedance is greater than a preset rated impedance threshold value; and if so, determining that the single battery pack is unhealthy.
On the basis of the above embodiments, in an embodiment of the present specification, the method further includes:
and the battery pack unhealthy determining module is used for determining that the battery pack to be tested is unhealthy if the number of the unhealthy single battery packs is greater than a preset number threshold.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to implement all or part of the functions described above.
In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.
On the other hand, the invention provides a battery charging and replacing station, wherein the battery charging and replacing station is provided with a battery charging and replacing system, and the battery charging and replacing system comprises the device for updating the SOH of the battery pack of the battery charging and replacing station.
An embodiment of the present invention further provides an electronic device, where the electronic device includes a processor and a memory, where the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the method for updating the SOH of the battery pack by the charging and charging station as described above.
In a specific embodiment, as shown in fig. 7, a schematic structural diagram of an electronic device provided in an embodiment of the present invention is shown. The electronic device 800 may include components such as memory 810 for one or more computer-readable storage media, processor 820 for one or more processing cores, input unit 830, display unit 840, Radio Frequency (RF) circuitry 850, wireless fidelity (WiFi) module 860, and power supply 870. Those skilled in the art will appreciate that the electronic device configuration shown in fig. 7 does not constitute a limitation of electronic device 800, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components. Wherein:
the memory 810 may be used to store software programs and modules, and the processor 820 executes various functional applications and data processing by operating or executing the software programs and modules stored in the memory 810 and calling data stored in the memory 810. The memory 810 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to use of the electronic device, and the like. Further, the memory 810 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device. Accordingly, memory 810 may also include a memory controller to provide processor 820 with access to memory 810.
The processor 820 is a control center of the electronic device 800, connects various parts of the whole electronic device by using various interfaces and lines, and performs various functions of the electronic device 800 and processes data by operating or executing software programs and/or modules stored in the memory 810 and calling data stored in the memory 810, thereby performing overall monitoring of the electronic device 800. The Processor 820 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The input unit 830 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. Specifically, the input unit 830 may include an image input device 831 and other input devices 832. The image input device 831 may be a camera or a photoelectric scanning device. The input unit 830 may include other input devices 832 in addition to the image input device 831. In particular, other input devices 832 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.
The display unit 840 may be used to display information input by or provided to a user and various graphical user interfaces of an electronic device, which may be made up of graphics, text, icons, video, and any combination thereof. The Display unit 840 may include a Display panel 841, and the Display panel 841 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like, as an option.
The RF circuit 850 may be used for receiving and transmitting signals during a message transmission or communication process, and in particular, for receiving downlink messages from a base station and then processing the received downlink messages by the one or more processors 820; in addition, data relating to uplink is transmitted to the base station. In general, the RF circuitry 850 includes, but is not limited to, an antenna, at least one Amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuit 850 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to Global System for Mobile communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), and the like.
WiFi belongs to short-range wireless transmission technology, and the electronic device 800 can help the user send and receive e-mails, browse web pages, access streaming media, etc. through the WiFi module 860, and it provides the user with wireless broadband internet access. Although fig. 7 shows WiFi module 860, it is understood that it does not belong to the essential components of electronic device 800, and may be omitted entirely as needed within the scope not changing the essence of the invention.
The electronic device 800 also includes a power supply 870 (e.g., a battery) for powering the various components, which may be logically coupled to the processor 820 via a power management system to manage charging, discharging, and power consumption via the power management system. The power source 870 may also include any component of one or more dc or ac power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.
It should be noted that, although not shown, the electronic device 800 may further include a bluetooth module, and the like, which is not described herein again.
An embodiment of the present invention further provides a storage medium, as shown in fig. 8, fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention; the storage medium stores at least one instruction, at least one program, a code set, or a set of instructions, which are executable by a processor of an electronic device to perform any one of the above methods for updating a battery pack SOH of a charging and charging station.
Optionally, in an embodiment of the present invention, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, the electronic device and the storage medium embodiment, since they are substantially similar to the method embodiment, the description is relatively simple, and the relevant points can be referred to the partial description of the method embodiment.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
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 fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A method for updating a battery pack SOH of a charging and replacing power station is characterized by comprising the following steps:
the method comprises the steps that a battery pack to be tested sends an SOH updating instruction to a master controller, wherein the SOH updating instruction is sent by the battery pack to be tested autonomously or based on an SOH updating request sent by the master controller;
the master controller starts a bidirectional AC-to-DC controller and a bidirectional DC-to-DC controller according to an SOH updating instruction sent by the battery pack to be tested, and sends a maintenance instruction to the battery pack to be tested;
the battery pack to be tested controls the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller to start a discharging mode based on the received maintenance instruction, so that each single battery pack starts to discharge at a preset first current threshold; acquiring the discharge voltage of each single battery pack, and stopping discharging when one of the discharge voltages is smaller than a preset voltage threshold; after a first time threshold value is preset, the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller are controlled to start a charging mode, so that each single battery is charged at a preset second current threshold value; acquiring a charging voltage value of each single battery pack, and stopping charging when the highest charging voltage value in the single battery packs is larger than a preset second voltage threshold value; and determining the actual charging capacity according to the charging time and the charging current, and updating the SOH according to the actual charging capacity.
2. The method of claim 1, further comprising:
the battery pack to be detected sends a physical examination request instruction to the master controller, wherein the physical examination request instruction is sent by the battery pack to be detected autonomously or based on a physical examination request sent by the master controller;
the master controller controls the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a physical examination mode based on the received physical examination request instruction, and sends a physical examination instruction to the battery pack to be detected;
the battery pack to be tested controls the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a discharging mode based on the received physical examination instruction, so that each single battery pack starts to discharge at a preset first current threshold value and is preset, and each single battery pack discharges at a preset first current threshold value and is preset with a second time threshold value; acquiring a voltage difference and a current difference of each single battery after discharging; determining the current impedance corresponding to the single battery according to the voltage difference and the current difference; judging whether the current impedance is larger than a preset rated impedance threshold value or not; and if so, determining that the single battery pack is unhealthy.
3. The method of claim 1, wherein said determining an actual charging capacity based on a charging time and said charging current, and updating an SOH based on said actual charging capacity, further comprises:
acquiring the rated capacity of the battery pack to be tested;
accordingly, the SOH is updated according to the rated capacity and the actual charging capacity.
4. The method of claim 2, further comprising:
and if the number of the unhealthy single battery packs is larger than a preset number threshold value, determining that the battery packs to be tested are unhealthy.
5. A device for updating SOH of a battery pack in a charging and replacing power station is characterized by comprising:
the system comprises an update instruction sending module, a master controller and a service module, wherein the update instruction sending module is used for sending an SOH update instruction to a battery pack to be tested to the master controller, and the SOH update instruction is sent by the battery pack to be tested autonomously or based on an SOH update request sent by the master controller;
the maintenance instruction sending module is used for starting the bidirectional AC-DC conversion controller and the bidirectional DC-DC conversion controller according to the SOH updating instruction sent by the battery pack to be tested by the master controller and sending a maintenance instruction to the battery pack to be tested;
the first discharging module is used for controlling the bidirectional AC-DC converter controller and the bidirectional DC-DC converter controller to start a discharging mode based on the received maintenance instruction by the battery pack to be tested so that each single battery pack starts to discharge at a preset first current threshold;
the discharge stopping module is used for acquiring the discharge voltage of each single battery pack, and stopping discharging when one of the discharge voltages is smaller than a preset voltage threshold;
the charging module is used for controlling the bidirectional AC-to-DC controller and the bidirectional DC-to-DC controller to start a charging mode after a first time threshold is preset, so that each single battery is charged at a preset second current threshold;
the charging stopping module is used for acquiring the charging voltage value of each single battery pack, and stopping charging when the highest charging voltage value in the single battery packs is larger than a preset second voltage threshold value;
and the updating module is used for determining the actual charging capacity according to the charging time and the charging current and updating the SOH according to the actual charging capacity.
6. The apparatus of claim 5, further comprising:
a physical examination instruction sending module, configured to send a physical examination request instruction to the master controller, where the physical examination request instruction is sent by the battery pack to be tested autonomously or based on a physical examination request sent by the master controller;
a physical examination instruction sending module, configured to control, by the master controller, the bidirectional ac-to-dc converter and the bidirectional dc-to-dc converter to start a physical examination mode based on the received physical examination request instruction, and send a physical examination instruction to the battery pack to be tested;
the second discharging module is used for controlling the bidirectional alternating current-to-direct current controller and the bidirectional direct current-to-direct current controller to start a discharging mode based on the received physical examination instruction, so that each single battery pack starts to discharge at a preset first current threshold value, and each single battery pack discharges at the preset first current threshold value for a preset second time threshold value;
the current impedance determining module is used for acquiring the voltage difference and the current difference of each single battery after discharging; determining the current impedance corresponding to the single battery according to the voltage difference and the current difference;
the battery pack unhealthy determining module is used for judging whether the current impedance is greater than a preset rated impedance threshold value; and if so, determining that the single battery pack is unhealthy.
7. The apparatus of claim 5, further comprising:
and the battery pack unhealthy determining module is used for determining that the battery pack to be tested is unhealthy if the number of the unhealthy single battery packs is greater than a preset number threshold.
8. An electronic device, comprising a processor and a memory, wherein the memory has stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by the processor to implement the method of updating a battery pack SOH of a charging station according to any one of claims 1-4.
9. A computer readable storage medium having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by a processor to implement the method of charging station updating package SOH according to any one of claims 1-6.
10. A charging and replacing power station, characterized in that the charging and replacing power station is provided with a charging and replacing power system, and the charging and replacing power system comprises the device for updating the SOH of the battery pack of the charging and replacing power station as claimed in any one of claims 5-7.
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