CN116707087A - Method and device for controlling power on and power off of battery system - Google Patents

Method and device for controlling power on and power off of battery system Download PDF

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Publication number
CN116707087A
CN116707087A CN202310750675.7A CN202310750675A CN116707087A CN 116707087 A CN116707087 A CN 116707087A CN 202310750675 A CN202310750675 A CN 202310750675A CN 116707087 A CN116707087 A CN 116707087A
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China
Prior art keywords
battery
battery pack
cluster
target
power
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CN202310750675.7A
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Chinese (zh)
Inventor
朱超帅
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Eve Energy Co Ltd
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Eve Energy Co Ltd
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Priority to CN202310750675.7A priority Critical patent/CN116707087A/en
Publication of CN116707087A publication Critical patent/CN116707087A/en
Pending legal-status Critical Current

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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
    • H01M10/44—Methods for charging or discharging
    • 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
    • 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
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or 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
    • H01M10/4285—Testing apparatus
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • 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
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller

Abstract

The invention discloses a method and a device for controlling power on and power off of a battery system, wherein the method comprises the following steps: acquiring a first operation type of a battery system and battery pack parameters of a target battery pack in the battery system, wherein the first operation type of the battery system is a power-on type or a power-off type, and the target battery pack is formed by connecting a plurality of battery clusters in parallel; judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, and obtaining an operation judgment result; and controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type. Therefore, the implementation of the invention can improve the control accuracy of the power on and off of the battery system, and is beneficial to improving the safety of the battery system.

Description

Method and device for controlling power on and power off of battery system
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a method and an apparatus for controlling power on and power off of a battery system.
Background
Along with the tightening of environmental protection policies and the price reduction of a power battery system, the electric ship provided with the battery system has the advantages of high economic benefit, environmental protection and the like, and is widely welcome in the application fields of urban ferries, sightseeing ships, inland cargo ships, harbor tugs, ocean-going mixed movements and the like, and the utilization rate of the electric ship is improved.
In practical application, a battery system of a large electric ship usually comprises a plurality of battery packs connected in series to form battery clusters, each battery cluster is provided with a cluster high-voltage box, and a plurality of battery clusters are connected in parallel to form a battery pack, and each battery pack is provided with a bus cabinet. Therefore, the battery system needs to bear higher direct current voltage and current when being electrified and powered down, wherein the electrification refers to the process from the power supply of the battery system to the stable operation of the battery system, and the power supply refers to the process of disconnecting the battery system from the power supply. However, if the current control is not proper in the up-and-down of the battery system, the high-voltage electric energy can damage the battery system, so that the safety of the electric ship is reduced, and even the safety of personnel and property of the electric ship is threatened. Therefore, it is important to provide a technical solution that can improve the control accuracy of powering up and powering down the battery system to improve the safety of the battery system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for controlling the power on and off of a battery system, which can improve the accuracy of controlling the power on and off of the battery system and are beneficial to improving the safety of the battery system.
In order to solve the above technical problem, a first aspect of the present invention discloses a method for controlling power on and power off of a battery system, the method comprising:
Acquiring a first operation type of a battery system and battery pack parameters of a target battery pack in the battery system, wherein the first operation type of the battery system is a power-on type or a power-off type, and the target battery pack is formed by connecting a plurality of battery clusters in parallel;
judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, and obtaining an operation judgment result;
and controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type.
In an optional implementation manner, in a first aspect of the present invention, the determining, according to a first operation type of the battery system and a battery parameter of the target battery pack, whether a current condition of the battery system meets a determined operation execution condition matched with the first operation type, to obtain an operation determination result includes:
according to a first operation type of the battery system, controlling the battery system to perform initial operation on a breaker of the target battery pack; wherein when the first operation type is the power-on type, the initial operation is to close the circuit breaker; when the first operation type is the power-down type, the initial operation is to open the circuit breaker;
Judging whether the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the first operation type or not;
when the judgment result is yes, generating an operation judgment result for representing that the current condition of the battery system meets the determined operation execution condition matched with the first operation type;
when the judgment result is negative, generating an operation judgment result for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type;
wherein, according to the operation judgment result and the operation flow corresponding to the first operation type, the controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack includes:
when the operation judgment result is used for indicating that the current condition of the battery system meets the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a first flow corresponding to the first operation type;
and when the operation judgment result is used for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a second flow corresponding to the first operation type.
As an optional implementation manner, in the first aspect of the present invention, the battery pack parameter of the target battery pack includes a cluster voltage difference of the target battery pack, where the cluster voltage difference is used to represent a voltage difference between each of the battery clusters in the target battery pack;
when the first operation type of the battery system is the power-on type, the determining whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type includes:
judging whether the cluster pressure difference of the target battery pack is smaller than or equal to a first pressure difference threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-on type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-on type.
As an optional implementation manner, in the first aspect of the present invention, when the first operation type of the battery system is the power-on type, the controlling, according to a first flow corresponding to the first operation type, the battery system to perform an operation corresponding to the first operation type on the target battery group includes:
Controlling the battery system to sequentially execute power-on operation on each battery cluster in the target battery pack according to a first power-on sequence of the target battery pack, which is determined in advance;
and when the first operation type of the battery system is the power-on type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type, including:
determining a second operation type of the target battery pack according to the cluster pressure difference of the target battery pack, wherein the second operation type is a charging type or a discharging type;
dividing all the battery clusters in the target battery pack into a first battery cluster set and a second battery cluster set according to screening conditions corresponding to the second operation type, wherein the first battery cluster set comprises battery clusters meeting the screening conditions in the target battery pack, and the second battery cluster set comprises battery clusters not meeting the screening conditions in the target battery pack;
controlling the battery system to sequentially execute power-on operation on each battery cluster in the first battery cluster set according to a second power-on sequence of the target battery pack, which is determined in advance;
According to the current threshold value corresponding to the second operation type, controlling each unpowered battery cluster in the second battery cluster set to execute an operation corresponding to the second operation type, wherein the unpowered battery cluster is used for representing a battery cluster with a current incomplete powering operation;
for each unpowered battery cluster in the second battery cluster set, when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than the first pressure difference threshold, controlling the battery system to execute power-on operation on the unpowered battery cluster;
and when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is greater than or equal to the first pressure difference threshold, re-executing the current threshold corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type.
As an optional implementation manner, in the first aspect of the present invention, before controlling, according to the current threshold corresponding to the second operation type, each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type, the method further includes:
When the cluster pressure difference of the target battery pack is judged to be larger than the first pressure difference threshold and the cluster pressure difference of the target battery pack is judged to be smaller than or equal to a second pressure difference threshold, controlling the battery system to close the balance relays of all the unpowered battery clusters in the second battery cluster set, triggering and executing the current threshold corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type;
and after controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type according to the current threshold corresponding to the second operation type, the method further includes:
when detecting that the first current temperature of the equalizing resistor of the target battery pack is greater than or equal to a first temperature threshold, controlling the battery system to disconnect an equalizing loop where the equalizing resistor is located until the current temperature of the equalizing resistor is reduced to be smaller than the first temperature threshold, triggering execution of the operation of powering up the unpowered battery clusters in the second battery cluster set, and when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than the first pressure difference threshold, controlling the battery system to execute the operation of powering up the unpowered battery clusters;
Wherein, after said controlling the battery system to perform a power-up operation on each unpowered battery cluster in the second set of battery clusters when a differential pressure between the unpowered battery cluster and other battery clusters in the second set of battery clusters is detected to be less than the first differential pressure threshold, the method further comprises:
and controlling the battery system to disconnect an equalizing relay of the battery cluster which is currently powered on.
As an optional implementation manner, in the first aspect of the present invention, the dividing all the battery clusters in the target battery pack into a first battery cluster set and a second battery cluster set according to the screening condition corresponding to the second operation type includes:
screening out a battery cluster with the voltage reaching a voltage threshold corresponding to the second operation type from the target battery pack as a reference battery cluster;
screening out the battery clusters, of which the pressure difference with the reference battery cluster is smaller than the first pressure difference threshold value, from the target battery pack as target battery clusters;
and determining the reference battery cluster and all the target battery clusters as a first battery cluster set, and determining the rest battery clusters except the first battery cluster set in the target battery pack as a second battery cluster set.
As an optional implementation manner, in the first aspect of the present invention, the current threshold value corresponding to the second operation type is determined by:
acquiring a first battery cluster number and a second battery cluster number of the target battery pack, wherein the first battery cluster number is used for indicating the number of battery clusters in the target battery pack, which are subjected to current power-on operation, and the second battery cluster number is used for indicating the number of battery clusters in the target battery pack, which are subjected to current power-on operation;
determining a target battery cluster number according to the first battery cluster number and the second battery cluster number, wherein the target battery cluster number is the battery cluster number with the smaller number of the first battery cluster number and the second battery cluster number;
and calculating the product between the number of the target battery clusters and a single cluster current threshold value to obtain a current threshold value corresponding to the second operation type, wherein the single cluster current threshold value is used for representing a threshold value of discharge current when a single battery cluster in the target battery pack executes discharge operation.
As an optional implementation manner, in the first aspect of the present invention, the battery parameter of the target battery pack further includes a circulation of the target battery pack;
Wherein when the first operation type of the battery system is the power-down type, before the controlling the battery system to perform an initial operation on the circuit breaker of the target battery pack according to the first operation type of the battery system, the method further includes:
judging whether the group current of the target battery pack is smaller than or equal to a group current threshold value, wherein the group current of the target battery pack is used for representing the circuit current of all the battery clusters connected in parallel in the target battery pack;
when the judgment result is yes, triggering and executing the operation of controlling the battery system to execute initial operation on the breaker of the target battery pack according to the first operation type of the battery system;
and when the first operation type of the battery system is the power-down type, the determining whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type includes:
judging whether the circulation of the target battery pack is smaller than or equal to a circulation threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-down type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-down type.
As an optional implementation manner, in the first aspect of the present invention, when the first operation type of the battery system is the power-down type, the controlling, according to a first flow corresponding to the first operation type, the battery system to perform an operation corresponding to the first operation type on the target battery group includes:
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
and when the first operation type of the battery system is the power-down type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type, including:
controlling the battery system to close an equalizing relay of each battery cluster in the target battery pack;
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
detecting a current circulation current of the target battery pack and a second current temperature of an equilibrium resistance of the target battery pack;
and when the current circulation of the target battery pack is detected to be smaller than or equal to the circulation threshold value or the second current temperature of the balancing resistor is detected to be smaller than or equal to a second temperature threshold value, controlling the battery system to disconnect a balancing relay of each battery cluster in the target battery pack so as to enable the battery system to finish the power-down operation.
The second aspect of the present invention discloses a device for controlling power on and off of a battery system, the device comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first operation type of a battery system and battery pack parameters of a target battery pack in the battery system, the first operation type of the battery system is a power-on type or a power-off type, and the target battery pack is formed by connecting a plurality of battery clusters in parallel;
the judging module is used for judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, and obtaining an operation judging result;
and the control module is used for controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type.
In a second aspect of the present invention, the determining module determines, according to a first operation type of the battery system and a battery parameter of the target battery pack, whether a current condition of the battery system meets a determined operation execution condition matched with the first operation type, and the specific manner of obtaining an operation determination result includes:
According to a first operation type of the battery system, controlling the battery system to perform initial operation on a breaker of the target battery pack; wherein when the first operation type is the power-on type, the initial operation is to close the circuit breaker; when the first operation type is the power-down type, the initial operation is to open the circuit breaker;
judging whether the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the first operation type or not;
when the judgment result is yes, generating an operation judgment result for representing that the current condition of the battery system meets the determined operation execution condition matched with the first operation type;
when the judgment result is negative, generating an operation judgment result for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type;
the specific manner of controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type by the control module comprises the following steps:
When the operation judgment result is used for indicating that the current condition of the battery system meets the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a first flow corresponding to the first operation type;
and when the operation judgment result is used for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a second flow corresponding to the first operation type.
As an alternative embodiment, in the second aspect of the present invention, the battery pack parameter of the target battery pack includes a cluster voltage difference of the target battery pack, the cluster voltage difference being used to represent a voltage difference between each of the battery clusters in the target battery pack;
when the first operation type of the battery system is the power-on type, the specific manner of the judging module judging whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type includes:
Judging whether the cluster pressure difference of the target battery pack is smaller than or equal to a first pressure difference threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-on type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-on type.
As an optional implementation manner, in the second aspect of the present invention, when the first operation type of the battery system is the power-on type, the specific manner of controlling, by the control module, the battery system to perform, on the target battery pack, the operation corresponding to the first operation type according to the first flow corresponding to the first operation type includes:
controlling the battery system to sequentially execute power-on operation on each battery cluster in the target battery pack according to a first power-on sequence of the target battery pack, which is determined in advance;
and when the first operation type of the battery system is the power-on type, the specific manner of controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type includes:
Determining a second operation type of the target battery pack according to the cluster pressure difference of the target battery pack, wherein the second operation type is a charging type or a discharging type;
dividing all the battery clusters in the target battery pack into a first battery cluster set and a second battery cluster set according to screening conditions corresponding to the second operation type, wherein the first battery cluster set comprises battery clusters meeting the screening conditions in the target battery pack, and the second battery cluster set comprises battery clusters not meeting the screening conditions in the target battery pack;
controlling the battery system to sequentially execute power-on operation on each battery cluster in the first battery cluster set according to a second power-on sequence of the target battery pack, which is determined in advance;
according to the current threshold value corresponding to the second operation type, controlling each unpowered battery cluster in the second battery cluster set to execute an operation corresponding to the second operation type, wherein the unpowered battery cluster is used for representing a battery cluster with a current incomplete powering operation;
for each unpowered battery cluster in the second battery cluster set, when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than the first pressure difference threshold, controlling the battery system to execute power-on operation on the unpowered battery cluster;
And when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is greater than or equal to the first pressure difference threshold, re-executing the current threshold corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type.
As an optional implementation manner, in a second aspect of the present invention, the control module is further configured to, before controlling, according to the current threshold corresponding to the second operation type, each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type, when it is determined that the cluster differential pressure of the target battery pack is greater than the first differential pressure threshold and the cluster differential pressure of the target battery pack is less than or equal to the second differential pressure threshold, control the battery system to close balance relays of all unpowered battery clusters in the second battery cluster set, and trigger to perform the current threshold corresponding to the second operation type, and control, according to the current threshold corresponding to the second operation type, each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type;
The control module is further configured to, after the current threshold corresponding to the second operation type is controlled to be set according to the current threshold corresponding to the second operation type, control the battery system to disconnect an equalization loop where the equalization resistor is located when detecting that a first current temperature of the equalization resistor of the target battery pack is greater than or equal to a first temperature threshold after each unpowered battery cluster in the second battery cluster set performs an operation corresponding to the second operation type, until the current temperature of the equalization resistor drops to a time point less than the first temperature threshold, and trigger to perform the operation of performing a power-on operation on each unpowered battery cluster in the second battery cluster set, and when detecting that a pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is less than the first pressure difference threshold, control the battery system to perform a power-on operation on the unpowered battery cluster;
the control module is further configured to, when detecting that a pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than the first pressure difference threshold, control the battery system to perform a power-on operation on the unpowered battery cluster, and then control the battery system to disconnect an equalizing relay of the battery cluster that has currently completed the power-on operation.
As an optional implementation manner, in the second aspect of the present invention, a specific manner of dividing all the battery clusters in the target battery pack into the first battery cluster set and the second battery cluster set according to the screening condition corresponding to the second operation type includes:
screening out a battery cluster with the voltage reaching a voltage threshold corresponding to the second operation type from the target battery pack as a reference battery cluster;
screening out the battery clusters, of which the pressure difference with the reference battery cluster is smaller than the first pressure difference threshold value, from the target battery pack as target battery clusters;
and determining the reference battery cluster and all the target battery clusters as a first battery cluster set, and determining the rest battery clusters except the first battery cluster set in the target battery pack as a second battery cluster set.
As an alternative embodiment, in the second aspect of the present invention, the current threshold corresponding to the second operation type is determined by:
acquiring a first battery cluster number and a second battery cluster number of the target battery pack, wherein the first battery cluster number is used for indicating the number of battery clusters in the target battery pack, which are subjected to current power-on operation, and the second battery cluster number is used for indicating the number of battery clusters in the target battery pack, which are subjected to current power-on operation;
Determining a target battery cluster number according to the first battery cluster number and the second battery cluster number, wherein the target battery cluster number is the battery cluster number with the smaller number of the first battery cluster number and the second battery cluster number;
and calculating the product between the number of the target battery clusters and a single cluster current threshold value to obtain a current threshold value corresponding to the second operation type, wherein the single cluster current threshold value is used for representing a threshold value of discharge current when a single battery cluster in the target battery pack executes discharge operation.
As an alternative embodiment, in the second aspect of the present invention, the battery parameter of the target battery further includes a circulation of the target battery;
the judging module is further configured to judge, when the first operation type of the battery system is the power-down type, whether a group current of the target battery group is less than or equal to a group current threshold before the initial operation of the circuit breaker of the target battery group is controlled to be performed according to the first operation type of the battery system, where the group current of the target battery group is used to represent a circuit current of all the battery clusters connected in parallel in the target battery group; when the judgment result is yes, triggering and executing the operation of controlling the battery system to execute initial operation on the breaker of the target battery pack according to the first operation type of the battery system;
And when the first operation type of the battery system is the power-down type, the specific manner of the judging module judging whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type includes:
judging whether the circulation of the target battery pack is smaller than or equal to a circulation threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-down type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-down type.
As an optional implementation manner, in the second aspect of the present invention, when the first operation type of the battery system is the power-down type, the specific manner of controlling, by the control module, the battery system to perform, on the target battery pack, the operation corresponding to the first operation type according to the first flow corresponding to the first operation type includes:
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
and when the first operation type of the battery system is the power-down type, the specific manner of controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type includes:
Controlling the battery system to close an equalizing relay of each battery cluster in the target battery pack;
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
detecting a current circulation current of the target battery pack and a second current temperature of an equilibrium resistance of the target battery pack;
and when the current circulation of the target battery pack is detected to be smaller than or equal to the circulation threshold value or the second current temperature of the balancing resistor is detected to be smaller than or equal to a second temperature threshold value, controlling the battery system to disconnect a balancing relay of each battery cluster in the target battery pack so as to enable the battery system to finish the power-down operation.
In a third aspect, the present invention discloses another apparatus for controlling power up and power down of a battery system, the apparatus comprising:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to execute the method for controlling power-on and power-off of the battery system disclosed in the first aspect of the present invention.
A fourth aspect of the present invention discloses a computer storage medium storing computer instructions that, when invoked, are used to perform the method of controlling power up and power down of the battery system disclosed in the first aspect of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, a first operation type of a battery system and battery pack parameters of a target battery pack in the battery system are acquired, wherein the first operation type of the battery system is a power-on type or a power-off type, and the target battery pack is formed by connecting a plurality of battery clusters in parallel; judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, and obtaining an operation judgment result; and controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type. Therefore, by implementing the invention, whether the current condition of the battery system meets the operation execution condition matched with the first operation type or not can be judged according to the acquired first operation type of the battery system and the battery parameters of the target battery pack, and the battery system is controlled to be electrified/electrified according to the judgment result and the corresponding operation flow, so that the function of electrifying/electrifying the battery pack under the condition that the battery pack meets the condition is realized, the efficiency of controlling the battery system to carry out voltage equalization can be improved, the control accuracy of electrifying/electrifying the battery system is improved, the safety and the reliability of the battery system for executing electrifying/electrifying operation are improved, and the safety of the battery system and the safety of a vehicle provided with the battery system are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for controlling power-on and power-off of a battery system according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for controlling power up and power down of a battery system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an up-current process of a method for controlling power up and power down of a battery system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a lower current flow of a method for controlling power up and power down of a battery system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for controlling power up and power down of a battery system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another device for controlling power up and power down of a battery system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or article that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or article.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention discloses a method and a device for controlling power on and power off of a battery system, which can judge whether the current condition of the battery system meets the operation execution condition matched with a first operation type according to the acquired first operation type of the battery system and the battery parameter of a target battery pack, and control the battery system to power on/power off according to the judgment result and the corresponding operation flow, so that the power on/power off function of the battery pack under the condition that the battery pack meets the condition is realized, the efficiency of controlling the battery system to perform voltage balance can be improved, the power on/power off control accuracy of the battery system is improved, the safety and the reliability of the battery system for executing power on/power off operation are improved, and the safety of the battery system and the safety of a vehicle provided with the battery system are improved. The following will describe in detail.
Example 1
Referring to fig. 1, fig. 1 is a flowchart of a method for controlling power on and power off of a battery system according to an embodiment of the invention. The method for controlling power on and power off of the battery system described in fig. 1 may be applied to a device for controlling power on and power off of the battery system, where the device may include one of a control device, a control terminal, a control system and a server, where the server includes a local server or a cloud server, and the device for controlling power on and power off of the battery system may be applied to a vehicle provided with the battery system, where the vehicle provided with the battery system may include a hybrid ship or a pure electric ship, and embodiments of the present invention are not limited. As shown in fig. 1, the method of controlling power up and power down of a battery system may include the following operations:
101. a first type of operation of the battery system and battery pack parameters of a target battery pack in the battery system are obtained.
In the embodiment of the present invention, the first operation type of the battery system may be a power-on type or a power-off type; the battery system may include a plurality of battery packs, the target battery pack being one of the battery packs in the battery system; the target battery pack can be formed by connecting a plurality of battery clusters in parallel, and each battery pack is provided with a corresponding bus cabinet; the battery clusters can be formed by connecting a plurality of battery packs in series, and each battery cluster is provided with a corresponding high-voltage box; the battery parameters of the target battery may include one or more of a combination of voltage parameters, current parameters, and temperature parameters in the target battery, which is not limited in the embodiment of the present invention.
102. And judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, and obtaining an operation judgment result.
103. And controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type.
In the embodiment of the invention, when the first operation type is a power-on type, the operation corresponding to the first operation type is the power-on operation; when the first operation type is a power-down type, the operation corresponding to the first operation type is a power-down operation; the power-on operation may be a precharge power-on operation; when the battery system performs the power-on operation on the target battery pack, the negative relay in the target battery pack needs to be closed first, then the positive relay in the target battery pack is closed, and the power-on operation on the target battery pack can be performed.
Therefore, by implementing the method described by the embodiment of the invention, whether the current condition of the battery system meets the operation execution condition matched with the first operation type or not can be judged according to the acquired first operation type of the battery system and the battery parameters of the target battery pack, and the battery system is controlled to be electrified/electrified according to the judgment result and the corresponding operation flow, so that the function of electrifying/electrifying the battery pack under the condition that the battery pack meets the condition is realized, the efficiency of controlling the battery system to carry out voltage equalization can be improved, the control accuracy of electrifying/electrifying of the battery system is improved, the safety and the reliability of the battery system for executing electrifying/electrifying operation are improved, and the safety of the battery system and the safety of a vehicle provided with the battery system are improved.
In an alternative embodiment, according to the first operation type of the battery system and the battery pack parameter of the target battery pack, determining whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type, to obtain the operation determination result may include the following operations:
according to the first operation type of the battery system, controlling the battery system to execute initial operation on a breaker of a target battery pack; when the first operation type is a power-on type, the initial operation is to close the circuit breaker; when the first operation type is a power-down type, the initial operation is to open the circuit breaker;
judging whether the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the first operation type;
when the judgment result is yes, generating an operation judgment result for representing that the current condition of the battery system meets the determined operation execution condition matched with the first operation type;
when the judgment result is negative, generating an operation judgment result for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type;
according to the operation judgment result and the operation flow corresponding to the first operation type, the battery system is controlled to execute the operation corresponding to the first operation type on the target battery pack, and the method comprises the following steps:
When the operation judgment result is used for indicating that the current condition of the battery system meets the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a first flow corresponding to the first operation type;
and when the operation judgment result is used for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type.
It should be noted that, the step of "controlling the battery system to perform the initial operation on the circuit breaker of the target battery pack according to the first operation type of the battery system" does not have a precedence over the step of "determining whether the battery pack parameter of the target battery pack satisfies the equalization condition corresponding to the first operation type", that is, the step of "controlling the battery system to perform the initial operation on the circuit breaker of the target battery pack according to the first operation type of the battery system" may occur before or after or simultaneously with the step of "determining whether the battery pack parameter of the target battery pack satisfies the equalization condition corresponding to the first operation type", which is not limited by the embodiment of the present invention.
The first flow Cheng Yongyu corresponding to the first operation type represents a normal power-up/normal power-down operation flow corresponding to the first operation type, and the second flow Cheng Yongyu corresponding to the first operation type represents an balanced power-up/balanced power-down operation flow corresponding to the first operation type.
Therefore, the optional embodiment can control the breaker of the target battery pack to execute the corresponding initial operation before controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack, so that the possibility of burning out the circuit due to high-voltage electric energy can be reduced, and the circuit safety of powering on and powering off the battery system is improved; and whether the battery system meets the operation execution condition matched with the first operation type can be determined by judging whether the battery pack parameter meets the equalization condition corresponding to the first operation type, so that the judgment accuracy of whether the battery system is balanced in voltage can be improved, the judgment accuracy of whether the battery system meets the operation execution condition is improved, and the control accuracy of powering on and powering off the battery system is improved; and when the battery system is judged to meet the conditions, the battery system is controlled to be electrified/electrified according to the first process, and when the battery system is judged to not meet the conditions, the battery system is controlled to be electrified/electrified according to the second process, so that the accuracy of determining the operation process can be improved, and the control accuracy of electrifying and electrifying the battery system is improved.
In this alternative embodiment, optionally, the battery parameters of the target battery may include a cluster pressure differential of the target battery, the cluster pressure differential being used to represent a voltage differential between individual clusters in the target battery;
when the first operation type of the battery system is a power-on type, determining whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type may include the following operations:
judging whether the cluster pressure difference of the target battery pack is smaller than or equal to a first pressure difference threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-on type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-on type.
The first pressure difference threshold may be a default pressure difference threshold determined in advance, or may be a pressure difference threshold determined according to a battery parameter of a target battery, or may be a maximum pressure difference value bearable by the battery system when the battery system performs a power-up operation/power-down operation, which is not limited in the embodiment of the present invention; the first differential pressure threshold may be, for example, 10V, which is not limited by the embodiment of the present invention.
It can be seen that, in this optional embodiment, when the first operation type is the power-on type, by determining whether the cluster differential pressure of the battery pack is less than or equal to the first differential pressure threshold, if the cluster differential pressure is less than or equal to the first differential pressure threshold, the battery pack parameter meets the equalization condition corresponding to the power-on type, and if the cluster differential pressure is greater than the first differential pressure threshold, the battery pack parameter does not meet the equalization condition corresponding to the power-on type, so that the accuracy of determining whether the battery system is balanced in voltage can be further improved, and the accuracy of determining whether the battery system meets the operation execution condition is further improved.
In this optional embodiment, optionally, when the first operation type of the battery system is a power-on type, according to a first flow corresponding to the first operation type, controlling the battery system to execute an operation corresponding to the first operation type on the target battery pack may include the following operations:
according to a first power-on sequence of a target battery pack, controlling a battery system to sequentially execute power-on operation on each battery cluster in the target battery pack;
and when the first operation type of the battery system is a power-on type, controlling the battery system to execute an operation corresponding to the first operation type on the target battery pack according to a second flow corresponding to the first operation type, may include the steps of:
Determining a second operation type of the target battery pack according to the cluster pressure difference of the target battery pack, wherein the second operation type is a charging type or a discharging type;
dividing all battery clusters in the target battery pack into a first battery cluster set and a second battery cluster set according to screening conditions corresponding to the second operation type, wherein the first battery cluster set comprises battery clusters which meet the screening conditions in the target battery pack, and the second battery cluster set comprises battery clusters which do not meet the screening conditions in the target battery pack;
according to a second power-on sequence of the target battery pack, controlling the battery system to sequentially execute power-on operation on each battery cluster in the first battery cluster set;
according to a current threshold value corresponding to the second operation type, controlling each unpowered battery cluster in the second battery cluster set to execute an operation corresponding to the second operation type, wherein the unpowered battery cluster is used for representing a battery cluster which is not subjected to the current power-on operation;
for each unpowered battery cluster in the second battery cluster set, when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than a first pressure difference threshold value, controlling the battery system to execute power-on operation on the unpowered battery cluster;
And when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is larger than or equal to the first pressure difference threshold value, re-executing the current threshold value corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type.
The first power-up sequence of the target battery pack may be a power-up sequence generated randomly, or may be a sequence obtained by sequencing voltage values of each battery cluster in the target battery pack, which is not limited in the embodiment of the present invention; the second power-up sequence of the target battery pack may be a randomly generated power-up sequence, or may be a sequence obtained by calculating a voltage difference between a predetermined reference voltage and a voltage of each battery cluster in the first battery cluster set and sequencing all the voltage differences.
When the second operation type is a charging type, the operation corresponding to the second operation type is a charging operation; when the second operation type is a discharge type, an operation corresponding to the second operation type is a discharge operation. It should be noted that, controlling the unpowered battery cluster to perform the operation corresponding to the second operation type refers to controlling the unpowered battery cluster to perform a charging operation or a discharging operation on other battery clusters in the target battery set so as to equalize voltages among the battery clusters.
By way of example, assume that there are 10 clusters A-J in the target battery, the first differential pressure threshold is 10V; and if the cluster pressure difference of the target battery pack is 8V, sequentially pre-charging and electrifying the battery clusters A to J according to the first electrifying sequence. If the cluster pressure difference of the target battery pack is 25V and it is determined that the target battery pack needs to perform discharging operation, dividing the battery clusters in the target battery pack into a first battery cluster set (including battery clusters A-E) and a second battery cluster set (including battery clusters F-J) according to screening conditions, powering up the battery clusters A-E in the first battery cluster set according to a second power-up sequence, controlling the battery clusters F-J in the second battery cluster set to perform discharging operation, and if the pressure difference between the battery clusters F and G and other battery clusters is detected to be less than 10V after discharging, powering up the battery clusters F and G, and then controlling the battery clusters H-J again to perform discharging operation and the like until all the battery clusters in the target battery pack are powered up.
Therefore, when the battery pack meets the equalization condition corresponding to the power-on type, the alternative embodiment can directly control the battery system to power on each battery cluster in the battery pack in sequence according to the predetermined power-on sequence, so that the power-on control accuracy of the battery clusters can be improved; when the battery pack does not meet the equalization condition corresponding to the power-on type, determining a second operation type to be executed by the battery pack, dividing the battery pack into a first battery cluster set and a second battery cluster set according to screening conditions corresponding to the second operation type, controlling a battery system to power on the first battery cluster set according to a predetermined power-on sequence, controlling the non-power-on battery cluster to execute the operation corresponding to the second operation type according to a current threshold, powering on the non-power-on battery cluster when detecting that the differential pressure of the non-power-on battery cluster and other battery clusters is smaller than the first differential pressure threshold, and re-executing the operation corresponding to the second operation type when detecting that the differential pressure of the non-power-on battery cluster and other battery clusters is larger than or equal to the first differential pressure threshold, so that the voltage equalization of the battery pack is performed in a mode of performing charge/discharge operation by the battery cluster, and the accuracy of controlling the battery cluster for determining the power-on operation can be improved, thereby improving the accuracy and efficiency of power-on control of the battery cluster, and improving the accuracy of power-on of the battery cluster, and improving the safety of the battery system.
In this alternative embodiment, further optionally, after detecting that the pressure difference between the unpowered battery cluster and the other battery clusters in the second battery cluster set is greater than or equal to the first pressure difference threshold, the method may further include the operations of:
counting the power-on time length of the battery system for executing the power-on operation on the target battery pack, wherein the power-on time length is the interval time length from the starting time of the battery system for executing the power-on operation on the first battery cluster to the current time;
judging whether the power-on duration exceeds a power-on duration threshold value;
when the power-on duration is judged not to exceed the power-on duration threshold, re-executing the current threshold corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type;
and ending the power-on process when the power-on time exceeds the power-on time threshold.
It should be noted that if the power-on duration exceeds the power-on duration threshold, the power-on of the battery system fails if the power-on of all the battery clusters is not completed in the target battery pack.
Therefore, in the optional embodiment, after detecting that the voltage difference between the unpowered battery cluster and the other battery clusters is greater than or equal to the first voltage difference threshold, if the counted powered-on duration does not exceed the powered-on duration threshold, the operation corresponding to the second operation type is executed again by the unpowered battery cluster, if the counted powered-on duration exceeds the powered-on duration threshold, the power-on procedure is ended, and the accuracy of the re-executing the charging/discharging operation by the unpowered battery cluster is improved, so that the accuracy of the battery cluster executing the powered-on operation is further determined, and the control accuracy of the powered-on of the battery cluster is further improved.
In this optional embodiment, further optionally, before controlling each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type according to the current threshold corresponding to the second operation type, the method may further include:
when the cluster pressure difference of the target battery pack is judged to be larger than the first pressure difference threshold and the cluster pressure difference of the target battery pack is judged to be smaller than or equal to the second pressure difference threshold, controlling the battery system to close the balance relays of all the unpowered battery clusters in the second battery cluster set, triggering and executing the current threshold corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type;
and after controlling each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type according to the current threshold corresponding to the second operation type, the method may further include the following operations:
when the first current temperature of the equalizing resistor of the target battery pack is detected to be greater than or equal to a first temperature threshold, controlling the battery system to disconnect an equalizing loop where the equalizing resistor is located until the current temperature of the equalizing resistor is reduced to be less than the first temperature threshold, triggering and executing the operation of executing the power-on operation on the power-on battery clusters when the pressure difference between the power-on battery clusters and other battery clusters in the second battery cluster set is detected to be less than the first pressure difference threshold;
Wherein, after detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is less than the first pressure difference threshold value for each unpowered battery cluster in the second battery cluster set, the method may further include the following operations after controlling the battery system to perform the power-on operation on the unpowered battery cluster:
the battery system is controlled to disconnect the equalizing relay of the battery cluster which is currently finished with the power-on operation.
Wherein the second differential pressure threshold is higher than the first differential pressure threshold; the circuit where the equalizing relay and/or the equalizing circuit is located is an equalizing loop; the second differential pressure threshold may be a default differential pressure threshold determined in advance, or may be a differential pressure threshold determined according to parameters of the equalization resistor of the target battery pack, which is not limited in the embodiment of the present invention; the second differential pressure threshold may be, for example, 20V, which is not limited by the embodiment of the present invention.
It should be noted that, in the embodiment of the present invention, the on/off balancing loop is controlled by closing/opening the balancing relay, so as to balance the voltages among the battery clusters in the second battery cluster set.
For example, assuming 10 clusters a-J in the target battery, the first differential pressure threshold is 10V and the second differential pressure threshold is 20V; if the cluster pressure difference of the target battery pack is 15V and it is determined that the target battery pack needs to perform discharging operation, after the battery clusters A-E in the first battery cluster set are electrified according to the second electrifying sequence, an equalizing relay needs to be closed before the second battery cluster set (including the battery clusters F-J) performs discharging operation so as to conduct an equalizing loop; after the second battery cluster set performs discharging operation, if the equalizing resistance in the equalizing loop exceeds the temperature threshold, the equalizing loop is required to be disconnected to cool the equalizing resistance, and when the temperature of the equalizing resistance is lower than the temperature threshold, the equalizing loop is conducted again, and after the unpowered battery clusters (battery clusters F and G) meeting the pressure difference condition are powered on, the equalizing relays of the battery clusters F and G are disconnected.
Therefore, the optional embodiment can also close the balancing relay before the battery cluster which is not electrified executes the operation corresponding to the second operation type, electrifies the battery cluster which is not electrified only when the temperature of the balancing resistor is detected to meet the condition, and opens the balancing relay after the battery cluster which is not electrified is electrified, so that the voltage balancing of the battery pack through a balancing loop formed by the balancing relay and the balancing resistor is realized, the safety and the control accuracy of the voltage balancing of the battery pack are improved, and the safety of the battery pack for executing the electrifies operation and the reliability of the electrifies process of the battery pack are improved, and the control accuracy of electrifies a battery system is further improved.
In this optional embodiment, still further optionally, dividing all the battery clusters in the target battery group into the first battery cluster set and the second battery cluster set according to the screening condition corresponding to the second operation type may include the following operations:
screening out a battery cluster with the voltage reaching a voltage threshold corresponding to the second operation type from the target battery pack as a reference battery cluster;
screening out a battery cluster, of which the pressure difference with the reference battery cluster is smaller than a first pressure difference threshold value, from the target battery pack as a target battery cluster;
The reference battery cluster and all the target battery clusters are determined to be a first battery cluster set, and the rest battery clusters except the first battery cluster set in the target battery pack are determined to be a second battery cluster set.
When the second operation type is a discharge type, the reference battery cluster may be a battery cluster having the highest voltage in the target battery pack; when the second operation type is a discharge type, the reference battery cluster may be a battery cluster with the lowest voltage in the target battery pack, and the embodiment of the present invention is not limited.
By way of example, assume that there are 10 clusters a-J in the target battery, the first differential pressure threshold is 10V; if the cluster pressure difference of the target battery pack is 15V, and it is determined that the target battery pack needs to perform discharging operation, the voltage value of the battery cluster A with the highest voltage in the target battery pack is 30V, the voltage value of the battery cluster B is 28V, and the voltage value of the battery cluster C is 21V, then the battery clusters B and C with the pressure difference between the target battery pack and the battery cluster A being smaller than 10V are screened out, namely, the first battery cluster set comprises the battery clusters A-C, and the second battery cluster set comprises D-J.
It can be seen that, this optional embodiment can also screen out the reference battery cluster that satisfies the voltage threshold and the battery cluster that is less than the first pressure difference threshold with the reference battery cluster from the group battery as first group battery cluster set, and confirm other battery clusters of group battery as second group battery cluster set, has improved the accuracy of dividing group battery cluster set to improve the accuracy of confirming the battery cluster that carries out the power-on operation, and then improve the control accuracy of voltage equalization.
In this alternative embodiment, yet further alternatively, the current threshold corresponding to the second operation type may be determined by:
acquiring a first battery cluster number and a second battery cluster number of a target battery pack, wherein the first battery cluster number is used for representing the battery cluster number of the target battery pack, which is currently complete in power-on operation, and the second battery cluster number is used for representing the battery cluster number of the target battery pack, which is currently incomplete in power-on operation;
determining a target battery cluster number according to the first battery cluster number and the second battery cluster number, wherein the target battery cluster number is the battery cluster number with the smaller number of the first battery cluster number and the second battery cluster number;
and calculating the product between the number of the target battery clusters and a single cluster current threshold value to obtain a current threshold value corresponding to the second operation type, wherein the single cluster current threshold value is used for representing the threshold value of discharge current when the single battery cluster in the target battery pack executes discharge operation.
The single cluster current threshold may be a single cluster maximum discharge current.
For example, assuming that the second operation type is a discharge type, the first battery cluster number is 6, the second battery cluster number is 4, and the single cluster current threshold is 2A; at this time, the number of the second battery clusters is smaller than that of the first battery clusters, and if the number of the target battery clusters is 4, the current threshold corresponding to discharge is 4×2a=8a.
It can be seen that the alternative embodiment can also determine the smaller one of the number of the battery clusters that are powered on and the number of the battery clusters that are not powered on in the battery pack as the target number of the battery clusters, calculate the product between the target number of the battery clusters and the current threshold of a single cluster to obtain the current threshold, and improve the accuracy of determining the current threshold, so that the accuracy of executing the operation corresponding to the second operation type by the battery clusters is improved, and further improve the accuracy and efficiency of controlling the battery clusters to power on.
In another alternative embodiment, before determining whether the current condition of the battery system satisfies the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, the method may further include the following operations:
detecting whether a first fault level of the battery system meets a fault level condition;
when the first fault level is detected to meet the fault level condition, triggering and executing the operation of judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack;
When the first fault level is detected to not meet the fault level condition, determining maintenance measures corresponding to the first fault level;
according to the maintenance measures corresponding to the first fault level, maintaining the battery system;
detecting a second fault level of the maintained battery system;
when the second fault level is detected to meet the fault level condition, triggering and executing the operation of judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack.
The higher the fault level of the battery system, the more serious the fault level of the battery system, and the fault level may be data obtained by detecting the battery system in real time, or may be data stored in a database corresponding to the battery system in advance.
For example, assuming that the fault level of the target battery pack is fault level 2 and the fault level condition is that the fault level is lower than a fault level threshold (for example, fault level 4), the fault level of the target battery pack satisfies the fault level condition, and the operation of subsequently judging whether the current condition of the battery system satisfies the determined operation execution condition matched with the first operation type can be directly executed.
Therefore, in this optional embodiment, if the fault level of the battery system meets the fault level condition, the operation of judging whether the battery system meets the operation execution condition may be directly executed, if the fault level does not meet the fault level condition, the battery system is maintained according to the determined maintenance measure, and if the fault level after maintenance meets the fault level condition, the operation of judging whether the battery system meets the operation execution condition is executed, so that the control accuracy and the safety of the battery system in executing the power-on and power-off operations may be improved, thereby improving the safety of the battery system.
Example two
Referring to fig. 2, fig. 2 is a flowchart of a method for controlling power on and power off of a battery system according to an embodiment of the invention. The method for controlling power up and power down of the battery system described in fig. 2 may be applied to a device for controlling power up and power down of the battery system, where the device may include one of a control device, a control terminal, a control system, and a server, where the server includes a local server or a cloud server, and the device for controlling power up and power down of the battery system may be applied to a vehicle provided with the battery system, where the vehicle provided with the battery system may include a hybrid ship or a pure electric ship, and embodiments of the present invention are not limited. As shown in fig. 2, the method of controlling power up and power down of the battery system may include the following operations:
201. A first type of operation of the battery system and battery pack parameters of a target battery pack in the battery system are obtained.
In the embodiment of the present invention, the battery pack parameter of the target battery pack may further include a circulation of the target battery pack.
202. When the first operation type of the battery system is a power-down type, it is determined whether a group current of the target battery group is less than or equal to a group current threshold. When the judgment result of the step 202 is yes, triggering and executing the step 203; and when the judgment result of the step 202 is negative, ending the power-on flow.
In the embodiment of the invention, the group current of the target battery group is used for representing the circuit current of all the battery clusters connected in parallel in the target battery group; for example, the group current threshold may be 100A.
203. According to the first operation type of the battery system, the battery system is controlled to perform an initial operation on the circuit breaker of the target battery pack.
In the embodiment of the invention, when the first operation type is the power-down type, the initial operation is to open the circuit breaker.
204. It is determined whether the circulation of the target battery pack is less than or equal to a circulation threshold. When the determination result of step 204 is yes, step 205 is executed; when the result of the determination in step 204 is no, step 206 is performed.
205. And controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the first flow corresponding to the first operation type.
206. And controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type.
In the embodiment of the present invention, for other detailed descriptions of step 201 and step 205-step 206, please refer to the detailed descriptions of step 101 and step 103-step 104 in the first embodiment, and the detailed descriptions of the embodiment of the present invention are omitted.
Therefore, by implementing the method described by the embodiment of the invention, whether the current condition of the battery system meets the operation execution condition matched with the first operation type or not can be judged according to the acquired first operation type of the battery system and the battery parameters of the target battery pack, and the battery system is controlled to be electrified/electrified according to the judgment result and the corresponding operation flow, so that the function of electrifying/electrifying the battery pack under the condition that the battery pack meets the condition is realized, the efficiency of controlling the battery system to carry out voltage equalization can be improved, the control accuracy of electrifying/electrifying of the battery system is improved, the safety and the reliability of the battery system for executing electrifying/electrifying operation are improved, and the safety of the battery system and the safety of a vehicle provided with the battery system are improved. In addition, when the first operation type is the power-down type, if the group current of the battery pack is judged to be smaller than or equal to the group current threshold value, the circuit breaker of the battery pack is closed, and the circuit safety of the battery pack can be improved; and when the first operation type is the power-down type, judging whether the circulation of the battery pack is smaller than or equal to the circulation threshold value, if the circulation is smaller than or equal to the circulation threshold value, the battery pack meets the balance condition, and if the circulation is larger than the circulation threshold value, the battery pack does not meet the balance condition, and further improving the judging accuracy of whether the battery system meets the balance condition, thereby further improving the judging accuracy of whether the battery system meets the operation execution condition.
In an alternative embodiment, when the first operation type of the battery system is a power-down type, according to a first flow corresponding to the first operation type, controlling the battery system to perform an operation corresponding to the first operation type on the target battery pack may include the following operations:
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
and when the first operation type of the battery system is the power-down type, controlling the battery system to execute an operation corresponding to the first operation type on the target battery pack according to a second flow corresponding to the first operation type may include the following operations:
controlling the battery system to close an equalizing relay of each battery cluster in the target battery pack;
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
detecting a current circulation current of the target battery pack and a second current temperature of an equilibrium resistance of the target battery pack;
when the current circulation of the target battery pack is detected to be smaller than or equal to the circulation threshold value, or the second current temperature of the balancing resistor is detected to be smaller than or equal to the second temperature threshold value, the battery system is controlled to disconnect the balancing relay of each battery cluster in the target battery pack, so that the battery system is powered down.
The positive relay of the battery cluster can be disconnected firstly, and then the negative relay of the battery cluster can be disconnected; the second temperature threshold may be equal to the first temperature threshold, or may be another temperature value different from the first temperature threshold, which is not limited in the embodiment of the present invention. Illustratively, the circulation threshold may be 10A.
Therefore, when the battery pack meets the balance condition, the anode relay and the cathode relay of the battery cluster can be directly disconnected, when the battery pack does not meet the balance condition, the balance relay is firstly closed, then the anode relay and the cathode relay of the battery cluster are disconnected, and if the current circulation of the battery pack meets the condition or the temperature of the balance resistor meets the condition, the balance relay is disconnected, so that the accuracy of controlling the on/off of a switching device in the battery pack can be improved, the circuit safety and the control accuracy of the battery pack are improved, and the control reliability of the battery system for executing the power-down operation is further improved.
In addition, in an exemplary embodiment of the present invention, when an upper current path diagram of the method for controlling the power on/off of the battery system is shown in fig. 3 and a lower current path diagram of the method is shown in fig. 4, the technical scheme of the method may be as follows:
In the power-on process, whether the cluster pressure difference is smaller than or equal to d1 can be judged firstly, if the cluster pressure difference is smaller than or equal to d1, after a breaker of a battery pack is closed, each battery cluster is pre-charged and powered on in sequence directly according to a random sequence, and the battery system is powered on;
if the cluster voltage difference is larger than d1 and smaller than or equal to d2, the voltage of the battery pack is balanced through the balancing resistor, and the specific mode is as follows: after determining that the charging/discharging operation is required to be performed on the battery clusters, closing a breaker of the battery pack, if the charging operation is performed, sequentially pre-charging the battery cluster with the highest voltage and the battery clusters with the voltage difference smaller than d1 between the battery clusters with the highest voltage according to a random sequence, then closing balance relays of other battery clusters which are not charged, performing the discharging operation according to the limited discharging current, if the temperature of the balance resistor is detected to be higher than a threshold value, opening an over-temperature balance loop until the temperature is smaller than the threshold value, then electrifying the battery clusters with the voltage difference smaller than d1, opening the balance relays of the battery clusters after electrifying, judging whether all the battery clusters in the battery pack are completely electrified, if the electrifying is completed, then electrifying the battery system, if the battery clusters are not electrified, detecting whether the current electrifying current process is overtime, if the current is not overtime, continuously executing the operation of closing the balance relays of other battery clusters which are not electrified, performing the discharging operation according to the limited discharging current, and if the current is overtime, then carrying out the operation of carrying out the discharging operation; if the charging operation is performed, sequentially pre-charging and electrifying the battery cluster with the lowest voltage and the battery cluster with the voltage difference smaller than d1 between the battery clusters with the lowest voltage according to a random sequence, then closing balance relays of other battery clusters which are not electrified, and performing the charging operation according to the limited charging current, wherein the follow-up flow is the same as the flow of the discharging operation with the cluster voltage difference larger than d1 and smaller than or equal to d2, and the repeated description is omitted;
If the cluster pressure difference is larger than d2, the voltage is rapidly balanced through the charge/discharge operation of the battery clusters, and the specific mode is as follows: after determining that the charging/discharging operation is required to be performed on the battery clusters, closing a breaker of the battery pack, if the charging operation is performed, sequentially pre-charging the battery clusters with the highest voltage and the battery clusters with the voltage difference smaller than d1 between the battery clusters and the highest voltage according to a random sequence, then performing the discharging operation according to the limited discharging current by the battery clusters which are not electrified, then electrifying the battery clusters with the voltage difference smaller than d1, judging whether all the battery clusters in the battery pack are electrified, if all the battery clusters are electrified, completing the electrification of the battery system, if not, detecting whether the current electrifying process is overtime, if not overtime, continuing to perform the operation of performing the discharging operation by the battery clusters which are not electrified according to the limited discharging current, and if overtime, performing the electrification failure of the battery system; if the charging operation is performed, sequentially pre-charging and electrifying the battery cluster with the lowest voltage and the battery cluster with the voltage difference smaller than d1 according to a random sequence, and then executing the charging operation according to the limited charging current by the battery cluster without electrifying, wherein the subsequent flow is the same as the flow of the discharging operation with the cluster voltage difference larger than d2, and the repeated description is omitted;
In the power-down flow, if the group current of the battery group is larger than C1, the power-down of the battery system fails; if the current of the battery pack is less than or equal to C1, the circuit breaker of the battery pack is disconnected, whether the circulation of the battery pack is less than or equal to C2 is judged, if the circulation of the battery pack is less than or equal to C2, the positive relay and the negative relay of each battery cluster are directly disconnected, and the battery system is powered down; if the circulation of the battery pack is greater than C2, the balancing relays of all the battery clusters are firstly closed, then the positive electrode relay and the negative electrode relay of all the battery clusters are disconnected, and then the balancing relays of all the battery clusters are disconnected when the balancing resistance temperature is lower than a temperature threshold value or the circulation is smaller than or equal to C2, so that the battery system is powered down.
Example III
Referring to fig. 5, fig. 5 is a schematic structural diagram of a device for controlling power on and power off of a battery system according to an embodiment of the invention. The device for controlling power on and off of the battery system described in fig. 5 may include one of a control device, a control terminal, a control system and a server, where the server includes a local server or a cloud server, and the device for controlling power on and off of the battery system may be applied to a vehicle provided with the battery system, where the vehicle provided with the battery system may include a hybrid ship or a pure electric ship, and embodiments of the present invention are not limited. As shown in fig. 5, the apparatus for controlling power up and power down of the battery system may include:
The obtaining module 301 is configured to obtain a first operation type of a battery system and a battery parameter of a target battery pack in the battery system, where the first operation type of the battery system is a power-on type or a power-off type, and the target battery pack is formed by connecting a plurality of battery clusters in parallel;
a judging module 302, configured to judge whether a current condition of the battery system meets a determined operation execution condition matched with the first operation type according to the first operation type of the battery system and a battery parameter of the target battery pack, so as to obtain an operation judgment result;
and the control module 303 is configured to control the battery system to perform an operation corresponding to the first operation type on the target battery pack according to the operation determination result and the operation flow corresponding to the first operation type.
Therefore, the device described by the embodiment of the invention can judge whether the current condition of the battery system meets the operation execution condition matched with the first operation type according to the acquired first operation type of the battery system and the battery parameter of the target battery pack, and control the battery system to power up/power down according to the judgment result and the corresponding operation flow, so that the function of powering up/power down the battery pack under the condition that the battery pack meets the condition is realized, the efficiency of controlling the battery system to perform voltage equalization can be improved, the control accuracy of powering up/power down of the battery system is improved, the safety and the reliability of the battery system for executing the powering up/down operation are improved, and the safety of the battery system and the safety of a vehicle provided with the battery system are improved.
In an alternative embodiment, the specific manner of determining, by the determining module 302, whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack may include:
according to the first operation type of the battery system, controlling the battery system to execute initial operation on a breaker of a target battery pack; when the first operation type is a power-on type, the initial operation is to close the circuit breaker; when the first operation type is a power-down type, the initial operation is to open the circuit breaker;
judging whether the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the first operation type;
when the judgment result is yes, generating an operation judgment result for representing that the current condition of the battery system meets the determined operation execution condition matched with the first operation type;
when the judgment result is negative, generating an operation judgment result for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type;
the specific manner of controlling the battery system to perform the operation corresponding to the first operation type on the target battery pack according to the operation determination result and the operation flow corresponding to the first operation type by the control module 303 may include:
When the operation judgment result is used for indicating that the current condition of the battery system meets the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a first flow corresponding to the first operation type;
and when the operation judgment result is used for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type.
Therefore, the device described by implementing the alternative embodiment can control the breaker of the target battery pack to execute the corresponding initial operation before the battery system is controlled to execute the operation corresponding to the first operation type on the target battery pack, so that the possibility that the circuit is burnt out due to high-voltage electric energy can be reduced, and the circuit safety of powering on and powering off the battery system is improved; and whether the battery system meets the operation execution condition matched with the first operation type can be determined by judging whether the battery pack parameter meets the equalization condition corresponding to the first operation type, so that the judgment accuracy of whether the battery system is balanced in voltage can be improved, the judgment accuracy of whether the battery system meets the operation execution condition is improved, and the control accuracy of powering on and powering off the battery system is improved; and when the battery system is judged to meet the conditions, the battery system is controlled to be electrified/electrified according to the first process, and when the battery system is judged to not meet the conditions, the battery system is controlled to be electrified/electrified according to the second process, so that the accuracy of determining the operation process can be improved, and the control accuracy of electrifying and electrifying the battery system is improved.
In this alternative embodiment, optionally, the battery parameters of the target battery may include a cluster pressure differential of the target battery, the cluster pressure differential being used to represent a voltage differential between individual clusters in the target battery;
when the first operation type of the battery system is a power-on type, the specific manner of determining, by the determining module 302, whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type may include:
judging whether the cluster pressure difference of the target battery pack is smaller than or equal to a first pressure difference threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-on type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-on type.
It can be seen that, when the first operation type is the power-on type, the device described in the implementation of the alternative embodiment can further improve the accuracy of judging whether the battery system is balanced by judging whether the cluster pressure difference of the battery pack is smaller than or equal to the first pressure difference threshold, if the cluster pressure difference is smaller than or equal to the first pressure difference threshold, the battery pack parameter meets the balance condition corresponding to the power-on type, and if the cluster pressure difference is greater than the first pressure difference threshold, the battery pack parameter does not meet the balance condition corresponding to the power-on type, so that the accuracy of judging whether the battery system is balanced by voltage is further improved, and whether the battery system meets the operation execution condition is further improved.
In this optional embodiment, optionally, when the first operation type of the battery system is a power-on type, the specific manner of controlling, by the control module 303, the battery system to perform the operation corresponding to the first operation type on the target battery pack according to the first flow corresponding to the first operation type may include:
according to a first power-on sequence of a target battery pack, controlling a battery system to sequentially execute power-on operation on each battery cluster in the target battery pack;
and, when the first operation type of the battery system is the power-on type, the specific manner of controlling the battery system to perform the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type may include:
determining a second operation type of the target battery pack according to the cluster pressure difference of the target battery pack, wherein the second operation type is a charging type or a discharging type;
dividing all battery clusters in the target battery pack into a first battery cluster set and a second battery cluster set according to screening conditions corresponding to the second operation type, wherein the first battery cluster set comprises battery clusters which meet the screening conditions in the target battery pack, and the second battery cluster set comprises battery clusters which do not meet the screening conditions in the target battery pack;
According to a second power-on sequence of the target battery pack, controlling the battery system to sequentially execute power-on operation on each battery cluster in the first battery cluster set;
according to a current threshold value corresponding to the second operation type, controlling each unpowered battery cluster in the second battery cluster set to execute an operation corresponding to the second operation type, wherein the unpowered battery cluster is used for representing a battery cluster which is not subjected to the current power-on operation;
for each unpowered battery cluster in the second battery cluster set, when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than a first pressure difference threshold value, controlling the battery system to execute power-on operation on the unpowered battery cluster;
and when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is larger than or equal to the first pressure difference threshold value, re-executing the current threshold value corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type.
Therefore, when the battery pack meets the equalization condition corresponding to the power-on type, the device described by implementing the alternative embodiment can also directly control the battery system to power on each battery cluster in the battery pack in sequence according to the predetermined power-on sequence, so that the power-on control accuracy of the battery clusters can be improved; when the battery pack does not meet the equalization condition corresponding to the power-on type, determining a second operation type to be executed by the battery pack, dividing the battery pack into a first battery cluster set and a second battery cluster set according to screening conditions corresponding to the second operation type, controlling a battery system to power on the first battery cluster set according to a predetermined power-on sequence, controlling the non-power-on battery cluster to execute the operation corresponding to the second operation type according to a current threshold, powering on the non-power-on battery cluster when detecting that the differential pressure of the non-power-on battery cluster and other battery clusters is smaller than the first differential pressure threshold, and re-executing the operation corresponding to the second operation type when detecting that the differential pressure of the non-power-on battery cluster and other battery clusters is larger than or equal to the first differential pressure threshold, so that the voltage equalization of the battery pack is performed in a mode of performing charge/discharge operation by the battery cluster, and the accuracy of controlling the battery cluster for determining the power-on operation can be improved, thereby improving the accuracy and efficiency of power-on control of the battery cluster, and improving the accuracy of power-on of the battery cluster, and improving the safety of the battery system.
In this optional embodiment, further optionally, the control module 303 is further configured to, before controlling, according to a current threshold corresponding to the second operation type, each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type, when it is determined that the cluster differential pressure of the target battery pack is greater than the first differential pressure threshold and the cluster differential pressure of the target battery pack is less than or equal to the second differential pressure threshold, control the battery system to close the equalizing relays of all unpowered battery clusters in the second battery cluster set, and trigger to perform an operation according to the current threshold corresponding to the second operation type, and control each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type;
the control module 303 is further configured to, after controlling each unpowered battery cluster in the second battery cluster set to perform an operation corresponding to the second operation type according to the current threshold corresponding to the second operation type, when a first current temperature of an equalization resistor of the detection target battery pack is greater than or equal to the first temperature threshold, control the battery system to disconnect an equalization loop in which the equalization resistor is located until the current temperature of the equalization resistor drops to a time point less than the first temperature threshold, and trigger to perform an operation for each unpowered battery cluster in the second battery cluster set, and when a differential pressure between the unpowered battery cluster and other battery clusters in the second battery cluster set is detected to be less than the first differential pressure threshold, control the battery system to perform a power-on operation for the unpowered battery cluster;
The control module 303 is further configured to, for each unpowered battery cluster in the second set of battery clusters, when detecting that a pressure difference between the unpowered battery cluster and other battery clusters in the second set of battery clusters is smaller than a first pressure difference threshold, control the battery system to perform a power-on operation on the unpowered battery cluster, and then control the battery system to disconnect an equalizing relay of the battery cluster that has currently completed the power-on operation.
Therefore, the device described by implementing the alternative embodiment can also close the balancing relay before the battery cluster which is not electrified executes the operation corresponding to the second operation type, electrifies the battery cluster which is not electrified only when the temperature of the balancing resistor is detected to meet the condition, and opens the balancing relay after the battery cluster which is not electrified is electrified, so that the voltage balancing of the battery pack through a balancing loop formed by the balancing relay and the balancing resistor is realized, the safety and the control accuracy of the voltage balancing of the battery pack are improved, and the safety of the battery pack for executing the electrifies operation and the reliability of the current process on the battery pack are improved, and the control accuracy of the electrifies of a battery system is further improved.
In this optional embodiment, still further optionally, the specific manner of dividing all the battery clusters in the target battery group into the first battery cluster set and the second battery cluster set by the control module 303 according to the screening condition corresponding to the second operation type may include:
Screening out a battery cluster with the voltage reaching a voltage threshold corresponding to the second operation type from the target battery pack as a reference battery cluster;
screening out a battery cluster, of which the pressure difference with the reference battery cluster is smaller than a first pressure difference threshold value, from the target battery pack as a target battery cluster;
the reference battery cluster and all the target battery clusters are determined to be a first battery cluster set, and the rest battery clusters except the first battery cluster set in the target battery pack are determined to be a second battery cluster set.
It can be seen that the device described in this optional embodiment is further capable of screening out, from the battery pack, the reference battery cluster satisfying the voltage threshold and the battery cluster having the voltage difference with the reference battery cluster smaller than the first voltage difference threshold as the first battery cluster set, and determining other battery clusters of the battery pack as the second battery cluster set, so that accuracy in dividing the battery cluster sets is improved, accuracy in determining the battery clusters for performing the power-on operation is improved, and control accuracy of voltage equalization is further improved.
In this alternative embodiment, yet further alternatively, the current threshold corresponding to the second operation type may be determined by:
acquiring a first battery cluster number and a second battery cluster number of a target battery pack, wherein the first battery cluster number is used for representing the battery cluster number of the target battery pack, which is currently complete in power-on operation, and the second battery cluster number is used for representing the battery cluster number of the target battery pack, which is currently incomplete in power-on operation;
Determining a target battery cluster number according to the first battery cluster number and the second battery cluster number, wherein the target battery cluster number is the battery cluster number with the smaller number of the first battery cluster number and the second battery cluster number;
and calculating the product between the number of the target battery clusters and a single cluster current threshold value to obtain a current threshold value corresponding to the second operation type, wherein the single cluster current threshold value is used for representing the threshold value of discharge current when the single battery cluster in the target battery pack executes discharge operation.
It can be seen that the device described in this optional embodiment can also determine the smaller one of the number of battery clusters that are powered up and the number of battery clusters that are not powered up in the battery pack as the target number of battery clusters, and calculate the product between the target number of battery clusters and the current threshold of a single cluster to obtain the current threshold, so that the accuracy of determining the current threshold can be improved, thereby improving the accuracy of performing the operation corresponding to the second operation type by the battery clusters, and further improving the accuracy and efficiency of controlling the battery clusters to power up.
In this alternative embodiment, optionally, the battery parameters of the target battery may further include a circulation of the target battery;
the judging module 302 is further configured to, when the first operation type of the battery system is a power-down type, judge whether a group current of the target battery group is less than or equal to a group current threshold before controlling the battery system to perform an initial operation on a breaker of the target battery group according to the first operation type of the battery system, where the group current of the target battery group is used to represent a circuit current of all battery clusters connected in parallel in the target battery group; when the judgment result is yes, triggering and executing the operation of controlling the battery system to execute initial operation on the breaker of the target battery pack according to the first operation type of the battery system;
And, when the first operation type of the battery system is the power-down type, the specific manner of determining, by the determining module 302, whether the battery pack parameter of the target battery pack satisfies the equalization condition corresponding to the first operation type may include:
judging whether the circulation of the target battery pack is smaller than or equal to a circulation threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-down type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-down type.
It can be seen that, when the first operation type is the power-down type, the device described in the implementation of the alternative embodiment is also capable of closing the circuit breaker of the battery pack if the battery pack current is determined to be less than or equal to the battery pack current threshold value, so that the circuit security of the battery pack can be improved; and when the first operation type is the power-down type, judging whether the circulation of the battery pack is smaller than or equal to the circulation threshold value, if the circulation is smaller than or equal to the circulation threshold value, the battery pack meets the balance condition, and if the circulation is larger than the circulation threshold value, the battery pack does not meet the balance condition, and further improving the judging accuracy of whether the battery system meets the balance condition, thereby further improving the judging accuracy of whether the battery system meets the operation execution condition.
In this optional embodiment, further optionally, when the first operation type of the battery system is a power-down type, the specific manner of controlling, by the control module 303, the battery system to perform the operation corresponding to the first operation type on the target battery pack according to the first flow corresponding to the first operation type may include:
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
and, when the first operation type of the battery system is the power-down type, the specific manner of controlling the battery system to perform the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type may include:
controlling the battery system to close an equalizing relay of each battery cluster in the target battery pack;
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
detecting a current circulation current of the target battery pack and a second current temperature of an equilibrium resistance of the target battery pack;
when the current circulation of the target battery pack is detected to be smaller than or equal to the circulation threshold value, or the second current temperature of the balancing resistor is detected to be smaller than or equal to the second temperature threshold value, the battery system is controlled to disconnect the balancing relay of each battery cluster in the target battery pack, so that the battery system is powered down.
It can be seen that the device described in this alternative embodiment can also be implemented to directly disconnect the positive relay and the negative relay of the battery cluster when the battery pack satisfies the equalization condition, and to close the equalization relay first and then disconnect the positive relay and the negative relay of the battery cluster when the battery pack does not satisfy the equalization condition, and to disconnect the equalization relay only if the current circulation of the battery pack satisfies the condition or the temperature of the equalization resistor satisfies the condition, so as to improve the accuracy of controlling the on/off of the switching device in the battery pack, thereby improving the circuit safety and the control accuracy of the battery pack, and further improving the control reliability of the battery system for executing the power-down operation.
Example IV
Referring to fig. 6, fig. 6 is a schematic structural diagram of another device for controlling power on and power off of a battery system according to an embodiment of the invention. As shown in fig. 6, the apparatus for controlling power up and power down of the battery system may include:
a memory 401 storing executable program codes;
a processor 402 coupled with the memory 401;
the processor 402 invokes executable program codes stored in the memory 401 to perform the steps in the method for controlling power-up and power-down of the battery system described in the first or second embodiment of the present invention.
Example five
The embodiment of the invention discloses a computer storage medium which stores computer instructions for executing the steps in the method for controlling the power-on and power-off of a battery system described in the first embodiment or the second embodiment of the invention when the computer instructions are called.
Example six
An embodiment of the present invention discloses a computer program product including a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps in the method for controlling power-up and power-down of a battery system described in the first embodiment or the second embodiment.
The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.
Finally, it should be noted that: the embodiment of the invention discloses a method and a device for controlling the power on and off of a battery system, which are disclosed as preferred embodiments of the invention, and are only used for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A method of controlling power up and down in a battery system, the method comprising:
acquiring a first operation type of a battery system and battery pack parameters of a target battery pack in the battery system, wherein the first operation type of the battery system is a power-on type or a power-off type, and the target battery pack is formed by connecting a plurality of battery clusters in parallel;
judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, and obtaining an operation judgment result;
And controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type.
2. The method for controlling power on and off of a battery system according to claim 1, wherein the determining whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery parameter of the target battery pack, to obtain an operation determination result, includes:
according to a first operation type of the battery system, controlling the battery system to perform initial operation on a breaker of the target battery pack; wherein when the first operation type is the power-on type, the initial operation is to close the circuit breaker; when the first operation type is the power-down type, the initial operation is to open the circuit breaker;
judging whether the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the first operation type or not;
when the judgment result is yes, generating an operation judgment result for representing that the current condition of the battery system meets the determined operation execution condition matched with the first operation type;
When the judgment result is negative, generating an operation judgment result for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type;
wherein, according to the operation judgment result and the operation flow corresponding to the first operation type, the controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack includes:
when the operation judgment result is used for indicating that the current condition of the battery system meets the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a first flow corresponding to the first operation type;
and when the operation judgment result is used for indicating that the current condition of the battery system does not meet the determined operation execution condition matched with the first operation type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to a second flow corresponding to the first operation type.
3. The method of controlling power up and down of a battery system according to claim 2, wherein the battery pack parameter of the target battery pack includes a cluster voltage difference of the target battery pack, the cluster voltage difference being indicative of a voltage difference between each of the battery clusters in the target battery pack;
When the first operation type of the battery system is the power-on type, the determining whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type includes:
judging whether the cluster pressure difference of the target battery pack is smaller than or equal to a first pressure difference threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-on type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-on type.
4. The method for controlling power up and power down of a battery system according to claim 3, wherein when the first operation type of the battery system is the power-up type, the controlling the battery system to perform the operation corresponding to the first operation type on the target battery pack according to the first flow corresponding to the first operation type includes:
controlling the battery system to sequentially execute power-on operation on each battery cluster in the target battery pack according to a first power-on sequence of the target battery pack, which is determined in advance;
and when the first operation type of the battery system is the power-on type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type, including:
Determining a second operation type of the target battery pack according to the cluster pressure difference of the target battery pack, wherein the second operation type is a charging type or a discharging type;
dividing all the battery clusters in the target battery pack into a first battery cluster set and a second battery cluster set according to screening conditions corresponding to the second operation type, wherein the first battery cluster set comprises battery clusters meeting the screening conditions in the target battery pack, and the second battery cluster set comprises battery clusters not meeting the screening conditions in the target battery pack;
controlling the battery system to sequentially execute power-on operation on each battery cluster in the first battery cluster set according to a second power-on sequence of the target battery pack, which is determined in advance;
according to the current threshold value corresponding to the second operation type, controlling each unpowered battery cluster in the second battery cluster set to execute an operation corresponding to the second operation type, wherein the unpowered battery cluster is used for representing a battery cluster with a current incomplete powering operation;
for each unpowered battery cluster in the second battery cluster set, when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than the first pressure difference threshold, controlling the battery system to execute power-on operation on the unpowered battery cluster;
And when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is greater than or equal to the first pressure difference threshold, re-executing the current threshold corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type.
5. The method of controlling power up and power down of a battery system according to claim 4, wherein before controlling each unpowered battery cluster in the second set of battery clusters to perform an operation corresponding to the second operation type according to the current threshold corresponding to the second operation type, the method further comprises:
when the cluster pressure difference of the target battery pack is judged to be larger than the first pressure difference threshold and the cluster pressure difference of the target battery pack is judged to be smaller than or equal to a second pressure difference threshold, controlling the battery system to close the balance relays of all the unpowered battery clusters in the second battery cluster set, triggering and executing the current threshold corresponding to the second operation type, and controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type;
And after controlling each unpowered battery cluster in the second battery cluster set to execute the operation corresponding to the second operation type according to the current threshold corresponding to the second operation type, the method further includes:
when detecting that the first current temperature of the equalizing resistor of the target battery pack is greater than or equal to a first temperature threshold, controlling the battery system to disconnect an equalizing loop where the equalizing resistor is located until the current temperature of the equalizing resistor is reduced to be smaller than the first temperature threshold, triggering execution of the operation of powering up the unpowered battery clusters in the second battery cluster set, and when detecting that the pressure difference between the unpowered battery cluster and other battery clusters in the second battery cluster set is smaller than the first pressure difference threshold, controlling the battery system to execute the operation of powering up the unpowered battery clusters;
wherein, after said controlling the battery system to perform a power-up operation on each unpowered battery cluster in the second set of battery clusters when a differential pressure between the unpowered battery cluster and other battery clusters in the second set of battery clusters is detected to be less than the first differential pressure threshold, the method further comprises:
And controlling the battery system to disconnect an equalizing relay of the battery cluster which is currently powered on.
6. The method for controlling power up and power down of a battery system according to claim 4 or 5, wherein the dividing all the battery clusters in the target battery pack into a first battery cluster set and a second battery cluster set according to the screening condition corresponding to the second operation type includes:
screening out a battery cluster with the voltage reaching a voltage threshold corresponding to the second operation type from the target battery pack as a reference battery cluster;
screening out the battery clusters, of which the pressure difference with the reference battery cluster is smaller than the first pressure difference threshold value, from the target battery pack as target battery clusters;
and determining the reference battery cluster and all the target battery clusters as a first battery cluster set, and determining the rest battery clusters except the first battery cluster set in the target battery pack as a second battery cluster set.
7. The method of controlling power up and down of a battery system according to claim 4 or 5, wherein the current threshold value corresponding to the second operation type is determined by:
acquiring a first battery cluster number and a second battery cluster number of the target battery pack, wherein the first battery cluster number is used for indicating the number of battery clusters in the target battery pack, which are subjected to current power-on operation, and the second battery cluster number is used for indicating the number of battery clusters in the target battery pack, which are subjected to current power-on operation;
Determining a target battery cluster number according to the first battery cluster number and the second battery cluster number, wherein the target battery cluster number is the battery cluster number with the smaller number of the first battery cluster number and the second battery cluster number;
and calculating the product between the number of the target battery clusters and a single cluster current threshold value to obtain a current threshold value corresponding to the second operation type, wherein the single cluster current threshold value is used for representing a threshold value of discharge current when a single battery cluster in the target battery pack executes discharge operation.
8. The method of controlling power up and down of a battery system according to claim 2, wherein the battery pack parameter of the target battery pack further comprises a circulation current of the target battery pack;
wherein when the first operation type of the battery system is the power-down type, before the controlling the battery system to perform an initial operation on the circuit breaker of the target battery pack according to the first operation type of the battery system, the method further includes:
judging whether the group current of the target battery pack is smaller than or equal to a group current threshold value, wherein the group current of the target battery pack is used for representing the circuit current of all the battery clusters connected in parallel in the target battery pack;
When the judgment result is yes, triggering and executing the operation of controlling the battery system to execute initial operation on the breaker of the target battery pack according to the first operation type of the battery system;
and when the first operation type of the battery system is the power-down type, the determining whether the battery pack parameter of the target battery pack meets the equalization condition corresponding to the first operation type includes:
judging whether the circulation of the target battery pack is smaller than or equal to a circulation threshold value;
when the judgment result is yes, determining that the battery pack parameters of the target battery pack meet the equalization conditions corresponding to the power-down type;
and when the judgment result is negative, determining that the battery pack parameters of the target battery pack do not meet the equalization conditions corresponding to the power-down type.
9. The method for controlling power up and power down of a battery system according to claim 8, wherein when the first operation type of the battery system is the power down type, the controlling the battery system to perform the operation corresponding to the first operation type on the target battery pack according to the first flow corresponding to the first operation type includes:
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
And when the first operation type of the battery system is the power-down type, controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the second flow corresponding to the first operation type, including:
controlling the battery system to close an equalizing relay of each battery cluster in the target battery pack;
the battery system is controlled to disconnect a positive electrode relay and a negative electrode relay of each battery cluster in the target battery pack;
detecting a current circulation current of the target battery pack and a second current temperature of an equilibrium resistance of the target battery pack;
and when the current circulation of the target battery pack is detected to be smaller than or equal to the circulation threshold value or the second current temperature of the balancing resistor is detected to be smaller than or equal to a second temperature threshold value, controlling the battery system to disconnect a balancing relay of each battery cluster in the target battery pack so as to enable the battery system to finish the power-down operation.
10. An apparatus for controlling power up and down of a battery system, the apparatus comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first operation type of a battery system and battery pack parameters of a target battery pack in the battery system, the first operation type of the battery system is a power-on type or a power-off type, and the target battery pack is formed by connecting a plurality of battery clusters in parallel;
The judging module is used for judging whether the current condition of the battery system meets the determined operation execution condition matched with the first operation type according to the first operation type of the battery system and the battery pack parameter of the target battery pack, and obtaining an operation judging result;
and the control module is used for controlling the battery system to execute the operation corresponding to the first operation type on the target battery pack according to the operation judgment result and the operation flow corresponding to the first operation type.
CN202310750675.7A 2023-06-21 2023-06-21 Method and device for controlling power on and power off of battery system Pending CN116707087A (en)

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CN202310750675.7A CN116707087A (en) 2023-06-21 2023-06-21 Method and device for controlling power on and power off of battery system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117375054A (en) * 2023-12-07 2024-01-09 上海派能能源科技股份有限公司 High-voltage access control method for energy storage system, equipment and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117375054A (en) * 2023-12-07 2024-01-09 上海派能能源科技股份有限公司 High-voltage access control method for energy storage system, equipment and storage medium
CN117375054B (en) * 2023-12-07 2024-02-27 上海派能能源科技股份有限公司 High-voltage access control method for energy storage system, equipment and storage medium

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