CN110018421B - Battery pack state monitoring method and system - Google Patents

Battery pack state monitoring method and system Download PDF

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Publication number
CN110018421B
CN110018421B CN201910428521.XA CN201910428521A CN110018421B CN 110018421 B CN110018421 B CN 110018421B CN 201910428521 A CN201910428521 A CN 201910428521A CN 110018421 B CN110018421 B CN 110018421B
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battery pack
overall
battery
state information
obtaining
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CN110018421A (en
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陈维
丁超
陈辉
廖理明
王磊
王鑫
黄吉
尤刚
卢科颖
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Sichuan Wangda Technology Co ltd
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Sichuan Wangda Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to a battery pack state monitoring method and system. The battery pack state monitoring method is applied to a monitoring host, and comprises the following steps: acquiring the overall state information of the battery pack in a historical monitoring time period and the single state information of each single battery in the battery pack; and obtaining the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery. The state monitoring result obtained by the battery pack state monitoring method has higher accuracy.

Description

Battery pack state monitoring method and system
Technical Field
The application relates to the technical field of power batteries, in particular to a battery pack state monitoring method and system.
Background
The battery pack is a chemical battery capable of being repeatedly charged and discharged, and can provide power sources for electric systems such as a traffic transportation system, a communication power system, a national defense and military system and the like. However, as the number of times of the battery pack being cyclically charged and discharged increases, the state of the battery pack gradually deteriorates until the battery pack cannot be used normally, and at this time, the battery pack that cannot be used normally is usually replaced in order to avoid potential safety hazards caused by the reduction in the operating performance of the power consumption system. Therefore, how to accurately obtain the state monitoring result of the battery pack as a reference condition for replacing the battery pack becomes an urgent technical problem to be solved in the technical field of power batteries.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and a system for monitoring a state of a battery pack, so as to achieve a technical effect of accurately obtaining a state monitoring result of the battery pack.
In a first aspect, an embodiment of the present application provides a battery pack state monitoring method, which is applied to a monitoring host, and the method includes:
acquiring the overall state information of a battery pack in a historical monitoring time period and the single state information of each single battery in the battery pack;
and obtaining a state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery.
The battery pack state monitoring method provided by the embodiment of the application can obtain the state monitoring result of the battery pack according to the overall state information of the battery pack in the historical monitoring time period and the monomer state information of each monomer battery in the battery pack, and meanwhile, the variable factor for obtaining the state monitoring result also comprises the monomer state information of each monomer battery in the battery pack besides the overall state information of the battery pack, so that the state monitoring result has higher accuracy.
With reference to the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, where the overall state information includes a plurality of overall discharge voltages, the cell state information includes a plurality of cell discharge voltages, and the state monitoring result includes a first monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining a first voltage drop rate of the battery pack in a first time period according to a plurality of overall discharge voltages of the battery pack;
obtaining a second voltage drop rate of each single battery in a first time period according to a plurality of single discharge voltages of each single battery;
and when a second voltage reduction rate meeting a first preset relation with the first voltage reduction rate exists in the second voltage reduction rates of all the single batteries, generating single battery replacement prompt information as the first monitoring result.
The battery pack state monitoring method provided by the embodiment of the application can obtain a first voltage drop rate of the battery pack in a first time period according to a plurality of overall discharge voltages of the battery pack, obtain a second voltage drop rate of each single battery in the first time period according to a plurality of single discharge voltages of each single battery, and generate single battery replacement prompt information as a first monitoring result when a second voltage drop rate meeting a first preset relation with the first voltage drop rate exists in the second voltage drop rates of all the single batteries. Therefore, when the first monitoring result is generated, the single battery which cannot be normally used can be determined according to the generated first monitoring result, and the technical effect of accurately obtaining the state monitoring result of the battery pack is achieved by ensuring the comprehensiveness of the state monitoring result.
With reference to the first aspect, in a second possible implementation manner of the first aspect, provided by an embodiment of the present application, the cell state information includes a plurality of cell internal resistances, and the state monitoring result includes a first monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the increase rate of the internal resistance of each single battery in a second time period according to the internal resistance of a plurality of single batteries of each single battery, wherein the battery pack is in a floating charge state in the second time period;
obtaining the average internal resistance increasing rate of all the battery monomers in the second time period according to the internal resistance increasing rates of all the battery monomers in the second time period;
and when the increase rate of the internal resistance of the single battery in all the single batteries meets a second preset relation with the average increase rate of the internal resistance, generating a single battery replacement prompt message as the first monitoring result.
The battery pack state monitoring method provided by the embodiment of the application can obtain the increase rate of the internal resistance of each battery cell in the second time period according to the internal resistances of the plurality of cells of each battery cell, the battery pack is in a floating charge state in the second time period, and obtain the average increase rate of the internal resistance of all the battery cells in the second time period according to the increase rates of the internal resistances of all the battery cells in the second time period. Therefore, when the first monitoring result is generated, the single battery which cannot be normally used can be determined according to the generated first monitoring result, and the technical effect of accurately obtaining the state monitoring result of the battery pack is achieved by ensuring the comprehensiveness of the state monitoring result.
With reference to the first aspect, in a third possible implementation manner of the first aspect, provided by an embodiment of the present application, the monomer state information includes a plurality of monomer internal resistances, and the state monitoring result includes a first monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the increase rate of the internal resistance of each single battery in a third time period according to the internal resistance of a plurality of single batteries of each single battery, wherein the battery pack is in a floating charge state in the third time period;
and when the increase rate of the internal resistance of the single battery is greater than a preset increase rate threshold value, generating a change prompt message of the single battery as the first monitoring result.
According to the battery pack state monitoring method provided by the embodiment of the application, the increase rate of the internal resistance of each battery cell in the third time period can be obtained according to the internal resistances of the plurality of cells of each battery cell, the battery pack is in a floating charge state in the third time period, and when the increase rate of the internal resistance of each cell is larger than the preset increase rate threshold value, the change prompt information of each cell is generated to serve as a first monitoring result. Therefore, when the first monitoring result is generated, the single battery which cannot be normally used can be determined according to the generated first monitoring result, and the technical effect of accurately obtaining the state monitoring result of the battery pack is achieved by ensuring the comprehensiveness of the state monitoring result.
With reference to the first aspect, in a fourth possible implementation manner of the first aspect, provided by an embodiment of the present application, the overall state information includes a plurality of overall discharging currents and a plurality of overall charging currents, and the state monitoring result includes a second monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the overall discharge electric quantity of the battery pack in a fourth time period according to a plurality of overall discharge currents of the battery pack, wherein the battery pack is in a float charging state in the fourth time period;
obtaining the integral charging electric quantity of the battery pack in a fourth time period according to a plurality of integral charging currents of the battery pack;
and when the whole discharging electric quantity and the whole charging electric quantity meet a third preset relation, generating a floating charge abnormity prompting message as the second monitoring result.
The battery pack state monitoring method provided by the embodiment of the application can obtain the whole discharging electric quantity of the battery pack in the fourth time period according to a plurality of whole discharging currents of the battery pack, the battery pack is in a floating charging state in the fourth time period, the whole charging electric quantity of the battery pack in the fourth time period is obtained according to a plurality of whole charging currents of the battery pack, and when the third preset relation is met between the whole discharging electric quantity and the whole charging electric quantity, the floating charging abnormal prompt information is generated to serve as a second monitoring result. Therefore, when the float charging abnormity prompting information is generated, the battery pack can be determined to be incapable of being normally used, and the technical effect of accurately obtaining the state monitoring result of the battery pack is achieved by ensuring the comprehensiveness of the state monitoring result.
With reference to the first aspect, an embodiment of the present application provides a fifth possible implementation manner of the first aspect, where the overall state information includes a plurality of overall discharge currents and a plurality of overall charge currents, and the state monitoring result includes a second monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the integral discharge electric quantity of the battery pack in a fifth time period according to a plurality of integral discharge currents of the battery pack, wherein the battery pack is in a floating charge state in the fifth time period;
obtaining the integral charging electric quantity of the battery pack in a fifth time period according to the plurality of integral charging currents of the battery pack;
obtaining an electric quantity difference value between the whole charging electric quantity and the whole discharging electric quantity;
and when the electric quantity difference value and the rated capacity of the battery pack meet a fourth preset relation, generating a floating charge abnormity prompting message as the second monitoring result.
The battery pack state monitoring method provided by the embodiment of the application can obtain the integral discharging electric quantity of the battery pack in the fifth time period according to a plurality of integral discharging currents of the battery pack, the battery pack is in a floating charging state in the fifth time period, the integral charging electric quantity of the battery pack in the fifth time period is obtained according to a plurality of integral charging currents of the battery pack, an electric quantity difference value between the integral charging electric quantity and the integral discharging electric quantity is obtained, and when the electric quantity difference value and the rated electric quantity of the battery pack meet a fourth preset relation, floating charging abnormal prompt information is generated to serve as a second monitoring result. Therefore, when the float charging abnormity prompting information is generated, the battery pack can be determined to be incapable of being normally used, and the technical effect of accurately obtaining the state monitoring result of the battery pack is achieved by ensuring the comprehensiveness of the state monitoring result.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, provided by an embodiment of the present application, the state monitoring result includes a third monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining theoretical available time of the battery pack according to the overall state information of the battery pack;
obtaining the predicted available time of the battery pack according to the overall state information of the battery pack;
and obtaining the real available time of the battery pack as a third monitoring result according to the theoretical available time and the predicted available time.
According to the battery pack state monitoring method provided by the embodiment of the application, the theoretical available time of the battery pack can be obtained according to the overall state information of the battery pack, the predicted available time of the battery pack can be obtained according to the overall state information of the battery pack, and the real available time of the battery pack can be obtained according to the theoretical available time and the predicted available time and serves as a third monitoring result. Therefore, the real available time of the battery pack can be obtained through the battery pack state monitoring method provided by the embodiment of the application, so that the comprehensiveness of the state monitoring result is ensured, and meanwhile, the real available time is obtained according to the theoretical available time and the predicted available time, so that the accuracy is high.
With reference to the sixth possible implementation manner of the first aspect, an embodiment of the present application provides a seventh possible implementation manner of the first aspect, where the overall state information includes a plurality of overall discharge currents and a plurality of overall charge currents;
the obtaining of the theoretical usable time of the battery pack according to the overall state information of the battery pack includes:
obtaining an initial capacity of the battery pack over a historical period of time;
obtaining a current capacity of the battery pack according to the initial capacity of the battery pack, a plurality of overall discharge currents of the battery pack and a plurality of overall charging currents of the battery pack;
selecting a current discharge current of the battery pack from a plurality of overall discharge currents of the battery pack;
and obtaining the theoretical usable time of the battery pack according to the current discharge current of the battery pack and the current capacity of the battery pack.
The method for monitoring the state of the battery pack, provided by the embodiment of the application, can obtain the initial capacitance of the battery pack in a historical time period, obtain the current capacitance of the battery pack according to the initial capacitance of the battery pack, a plurality of overall discharging currents of the battery pack and a plurality of overall charging currents of the battery pack, select the current discharging current of the battery pack from the plurality of overall discharging currents of the battery pack, and obtain the theoretical available time of the battery pack according to the current discharging current of the battery pack and the current capacitance of the battery pack. The theoretical available time has higher accuracy, so that the accuracy of the real available time is ensured.
With reference to the sixth possible implementation manner of the first aspect, an embodiment of the present application provides an eighth possible implementation manner of the first aspect, where the overall state information includes a plurality of overall discharge voltages;
the obtaining the predicted available time of the battery pack according to the overall state information of the battery pack includes:
dividing a historical monitoring time period of the battery pack into a plurality of sub-time periods;
obtaining a third voltage drop rate of the battery pack in each sub-period according to a plurality of overall discharge voltages of the battery pack;
and obtaining the predicted available time of the battery pack according to a plurality of overall discharge voltages of the battery pack and the third voltage reduction rate of the battery pack in each sub-time period.
According to the battery pack state monitoring method provided by the embodiment of the application, the historical monitoring time period of the battery pack can be divided into a plurality of sub-time periods, the third voltage drop rate of the battery pack in each sub-time period is obtained according to a plurality of overall discharge voltages of the battery pack, and the predicted available time of the battery pack is obtained according to the plurality of overall discharge voltages of the battery pack and the third voltage drop rate of the battery pack in each sub-time period. The prediction of the available time has higher accuracy, thereby ensuring the accuracy of the real available time.
In a second aspect, an embodiment of the present application provides a battery pack state monitoring system, configured to perform state monitoring on a battery pack, where the battery pack includes M single batteries, the battery pack state monitoring system includes a first sensing device, a second sensing device and a monitoring host, the first sensing device is connected to the monitoring host and the battery pack respectively, the second sensing device is provided with M second sensing devices, the M second sensing devices correspond to the M single batteries one by one, and each second sensing device is connected to the monitoring host and the corresponding single battery respectively;
the first sensing device is used for acquiring the overall state information of the battery pack and sending the overall state information to the monitoring host;
each second sensing device is used for obtaining monomer state information of the corresponding monomer battery and sending the monomer state information to the monitoring host;
the monitoring host is configured to perform the battery pack state monitoring method provided in the first aspect, or any one of the possible implementations of the first aspect.
The battery pack state monitoring system that this application embodiment provided can obtain the whole state information of group battery through first sensing device, and send to the monitoring host computer, and obtain the monomer state information of corresponding battery cell through every second sensing device, and send to the monitoring host computer, and the monitoring host computer is then according to the whole state information of group battery, and the monomer state information of every battery cell, obtain the state monitoring result of group battery, because the variable factor who obtains this state monitoring result is including the whole state information of group battery except, still include the monomer state information of every battery cell in the group battery, therefore, this state monitoring result has higher accuracy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural block diagram of a battery pack state monitoring system according to an embodiment of the present disclosure.
Fig. 2 is a schematic view of an application scenario of the battery pack state monitoring system shown in fig. 1.
Fig. 3 is a block diagram of another schematic structure of a battery pack state monitoring system according to an embodiment of the present disclosure.
Fig. 4 is a flowchart of a battery pack state monitoring method according to an embodiment of the present disclosure.
Fig. 5 is a flowchart of a first sub-step of step S200 in fig. 4.
Fig. 6 is a flowchart of a second sub-step of step S200 in fig. 4.
Fig. 7 is a flowchart illustrating a third sub-step of step S200 in fig. 4.
Fig. 8 is a flowchart illustrating a fourth sub-step of step S200 in fig. 4.
Fig. 9 is a flowchart of a fifth sub-step of step S200 in fig. 4.
Fig. 10 is a flowchart of a sixth sub-step of step S200 in fig. 4.
Fig. 11 is a flowchart of sub-steps of step S261 in fig. 10.
Fig. 12 is a flowchart illustrating sub-steps of step S262 in fig. 10.
Reference numerals: 100-battery state monitoring system; 110-a first sensing device; 111-a first voltage sensor; 112-a current sensor; 120-a second sensing device; 121-a second voltage sensor; 122-internal resistance sensor; 123-temperature sensor; 130-monitoring host; 140-a station machine; 150-a server; 160-an electronic terminal; 200-a battery pack; 210-single cell.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Referring to fig. 1 and fig. 2, an embodiment of the present application provides a battery pack state monitoring system 100 for performing state monitoring on a battery pack 200, where the battery pack 200 includes M single cells 210, where M is an integer greater than or equal to 2. The battery pack 200 includes a first positive electrode and a first negative electrode, and each of the M unit cells 210 included in the battery pack 200 includes a second positive electrode and a second negative electrode. In addition, in the embodiment of the present application, the M single batteries 210 included in the battery pack 200 may be connected in series or may be connected in parallel, and the battery pack state monitoring system 100 provided in the embodiment of the present application will be described below by taking the M single batteries 210 included in the battery pack 200 as an example of being connected in series.
The battery pack state monitoring system 100 includes a first sensing device 110, a second sensing device 120 and a monitoring host 130, wherein the first sensing device 110 is connected with the monitoring host 130 and the battery pack 200, the number of the second sensing devices 120 is M, the M second sensing devices 120 are in one-to-one correspondence with the M single batteries 210, and each second sensing device 120 is connected with the monitoring host 130 and the corresponding single battery 210.
The first sensing device 110 is used for obtaining the overall state information of the battery pack 200 and sending the information to the monitoring host 130. The overall state information may include an overall discharge voltage, an overall charge current, and an overall discharge current, and thus, in the embodiment of the present application, the first sensing device 110 may include a first voltage sensor 111 and a current sensor 112. The first voltage sensor 111 is connected to a first positive electrode and a first negative electrode of the battery pack 200, respectively, for obtaining an overall discharge voltage of the battery pack 200. The current sensor 112 may be an inductive current sensor such as a hall current sensor or a rogowski coil, and the current sensor 112 may be sleeved on a connection cable between the first voltage sensor 111 and the first positive electrode of the battery pack 200, so as to obtain an overall charging current and an overall discharging current of the battery pack 200.
Each second sensing device 120 is configured to obtain cell state information of the corresponding cell 210 and send the cell state information to the monitoring host 130. The cell state information may include a cell discharge voltage, a cell internal resistance, and a surface temperature, and thus, in this embodiment, the second sensing device 120 may include a second voltage sensor 121, an internal resistance sensor 122, and a temperature sensor 123. The second voltage sensor 121 is connected to a second positive electrode and a second negative electrode of the single battery 210, respectively, and is configured to obtain a cell discharge voltage of the single battery 210. The internal resistance sensor 122 is respectively connected to the second positive electrode and the second negative electrode of the single battery 210, and is configured to obtain the internal resistance of the single battery 210. The temperature sensor 123 is attached to the surface of the unit battery 210 to obtain the surface temperature of the unit battery 210.
The monitoring host 130 is configured to obtain a state monitoring result of the battery pack 200 according to the overall state information of the battery pack 200 and the cell state information of each cell 210. Since the variable factor for obtaining the state monitoring result includes the cell state information of each cell 210 in the battery pack 200 in addition to the overall state information of the battery pack 200, the state monitoring result has high accuracy.
In addition, in order to reduce the complexity of the physical structure of the battery state monitoring system 100, in the embodiment of the present application, the first voltage sensor 111 may be integrated in the monitoring host 130, the second voltage sensor 121, the internal resistance sensor 122, and the temperature sensor 123 may be integrated, and meanwhile, the current sensor 112, the M second voltage sensors 121, the M internal resistance sensors 122, and the M temperature sensors 123 may communicate with the monitoring host 130 in a bus communication mode, for example, a serial bus communication mode or a ring bus communication mode.
Referring to fig. 3, in the embodiment of the present application, the battery pack state monitoring system 100 may further include a station 140, a server 150, and an electronic terminal 160. The station 140 is connected to the monitoring host and the server 150, respectively, and configured to obtain a status monitoring result sent by the monitoring host, perform format conversion on the status monitoring result, and send the status monitoring result to the server 150. The server 150 is further connected to the electronic terminal 160, and is configured to send the received status monitoring result to the electronic terminal 160 for displaying.
Referring to fig. 4, an embodiment of the present application further provides a battery pack state monitoring method, which is applied to the monitoring host, that is, the monitoring host is configured to execute the battery pack state monitoring method provided in the embodiment of the present application. It should be noted that the battery pack state monitoring method provided in the embodiment of the present application is not limited by the sequence shown in fig. 4 and the following, and specific procedures and steps of the battery pack state monitoring method are described below with reference to fig. 4.
Step S100, obtaining the overall state information of the battery pack in the historical monitoring time period and the single state information of each single battery in the battery pack.
The historical monitoring time period comprises at least one charging time period and at least one discharging time period, and the charging time period comprises at least one floating charging time period. In addition, in this embodiment of the present application, the overall state information of the primary battery pack and the cell state information of each cell in the battery pack are obtained at intervals of a preset duration, where the preset duration may be 1s, but is not limited to 1s, and therefore it can be understood that in this embodiment of the present application, the overall state information includes a plurality of overall discharge voltages, a plurality of overall charge currents, and a plurality of overall discharge currents, and the cell state information of each cell includes a plurality of cell discharge voltages, a plurality of cell internal resistances, and a plurality of surface temperatures.
And step S200, obtaining a state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery.
Including M battery cell in the group battery, consequently, every battery cell all can influence the state of group battery, and based on this, this application embodiment will monitor every battery cell, when confirming that there is the battery cell of unable normal use in M battery cell, generate battery cell change prompt information, as first monitoring result.
Referring to fig. 5, based on the above description, as a first embodiment, the step S200 may include three sub-steps of step S211, step S212, and step S213.
In step S211, a first voltage drop rate of the battery pack in a first time period is obtained according to a plurality of overall discharge voltages of the battery pack.
In addition, in this embodiment of the present application, the total discharge voltage obtained in the first period includes at least 600, that is, when the preset time is 1s, the time length of the first period is at least 5 min.
Step S212, obtaining a second voltage drop rate of each single battery in the first time period according to the plurality of single discharge voltages of each single battery.
Step S213, when there is a second voltage drop rate satisfying a first preset relationship with the first voltage drop rate in the second voltage drop rates of all the single batteries, generating a single battery replacement prompt message as a first monitoring result.
In this embodiment of the application, the first preset relationship may be:
Du2＞mDu1
wherein D isu1Is a first voltage drop rate, Du2For the second voltage drop rate, m may be 2, but is not limited to 2.
Referring to fig. 6, as a second embodiment, step S200 may include three substeps, step S221, step S222 and step S223.
Step S221, obtaining the increase rate of the internal resistance of each single battery in a second time period according to the internal resistances of the single batteries of each single battery, wherein the battery pack is in a floating charge state in the second time period.
In the embodiment of the application, the charging time period comprises an equalizing charging time period and a floating charging time period, and the overall charging current obtained in the equalizing charging time period is larger than the overall charging current obtained in the floating charging time period. In addition, in this embodiment of the present application, the total charging current obtained in the second time period at least includes 600, that is, when the preset time period is 1s, the time length of the second time period is at least 5 min.
Step S222, obtaining an average internal resistance increase rate of all the battery cells in the second time period according to the internal resistance increase rates of all the battery cells in the second time period.
In step S223, when there is a cell internal resistance increase rate satisfying a second preset relationship with the average internal resistance increase rate among the cell internal resistance increase rates of all the cells, a cell replacement prompt message is generated as a first monitoring result.
In this embodiment of the application, the second preset relationship may be:
Ir1＞nIr2
wherein, Ir1For increasing the internal resistance of the monomer, Ir2For the average internal resistance increase rate, n may be 2, but is not limited to 2.
Referring to fig. 7, as a third embodiment, step S200 may include two substeps, step S231 and step S232.
Step S231, obtaining a monomer internal resistance increase rate of each battery monomer in a third time period according to the plurality of monomer internal resistances of each battery monomer, where in the third time period, the battery pack is in a floating charge state.
In the embodiment of the application, the charging time period comprises an equalizing charging time period and a floating charging time period, and the overall charging current obtained in the equalizing charging time period is larger than the overall charging current obtained in the floating charging time period. In addition, in this embodiment of the present application, the internal resistance of the monomer obtained in the third time period at least includes 600, that is, when the preset time is 1s, the time length of the third time period is at least 5 min.
Step S232, when the increase rate of the internal resistance of the single battery is larger than the preset increase rate threshold value, generating a change prompt message of the single battery as a first monitoring result.
In the embodiment of the present application, the value of the preset increase rate threshold may be 30%, but is not limited to 30%.
After obtaining first monitoring result, just can be according to first monitoring result, determine unable normal use's battery cell, change it, so, not only through the comprehensiveness of ensureing the state monitoring result, realized accurately obtaining the technological effect of the state monitoring result of group battery, can also avoid the waste of battery resource.
In addition, in order to improve the accuracy of the first monitoring result, in the embodiment of the present application, when there exists a single battery that simultaneously satisfies three determination conditions, i.e., the first predetermined relationship is satisfied between the second voltage reduction rate and the first voltage reduction rate, the second predetermined relationship is satisfied between the increase rate of the internal resistance of the single battery and the average increase rate of the internal resistance of the single battery, and the increase rate of the internal resistance of the single battery is greater than the threshold of the predetermined increase rate, the single battery replacement prompt information may be generated as the first monitoring result.
When the state of the battery pack gradually deteriorates until the battery pack cannot be normally used, the floating charge state of the battery pack is abnormal, and based on the abnormal floating charge state, in the embodiment of the application, the floating charge state of the battery pack is monitored, and when the floating charge state of the battery pack is abnormal, the floating charge abnormal prompt information is generated and serves as a second monitoring result.
Referring to fig. 8, based on the above description, as a fourth embodiment, step S200 may include three sub-steps of step S241, step S242 and step S243.
Step S241, obtaining the total discharge capacity of the battery pack in a fourth time period according to the plurality of total discharge currents of the battery pack, wherein the battery pack is in a float state in the fourth time period.
In the embodiment of the present application, the overall discharge capacity may be obtained according to the time length of the fourth time period and an average value of all overall discharge currents of the battery pack in the fourth time period.
In the embodiment of the application, the charging time period comprises an equalizing charging time period and a floating charging time period, and the overall charging current obtained in the equalizing charging time period is larger than the overall charging current obtained in the floating charging time period. The fourth time period is any one of the floating charge time periods, and the fourth time period is also in the discharge time period, that is, the battery pack is in the charge (floating charge) state and the discharge state simultaneously in the fourth time period. In addition, in the embodiment of the present application, the total discharge current obtained in the fourth period of time at least includes 600, that is, when the preset time period is 1s, the time length of the fourth period of time is at least 5 min.
In step S242, the overall charging capacity of the battery pack in the fourth time period is obtained according to the plurality of overall charging currents of the battery pack.
Also, in the embodiment of the present application, the overall charging capacity may be obtained according to the time length of the fourth time period and the average value of all the overall charging currents of the battery pack during the fourth time period.
In step S243, when the total discharging electric quantity and the total charging electric quantity satisfy a third preset relationship, a floating charge abnormality prompt message is generated as a second monitoring result.
In this embodiment of the application, the third preset relationship may be:
C2＞xC1
wherein, C1For the total discharge of electric power, C2For the overall charge capacity, x may be 3, but is not limited to 3.
Referring to fig. 9, as a fifth embodiment, the step S200 may include four sub-steps of step S251, step S252, step S253, and step S254.
Step S251, obtaining the total discharge capacity of the battery pack in a fifth time period according to the plurality of total discharge currents of the battery pack, where the battery pack is in a floating state in the fifth time period.
In the embodiment of the present application, the overall discharge capacity may be obtained according to the time length of the fifth time period and an average value of all overall discharge currents of the battery pack in the fifth time period.
In the embodiment of the application, the charging time period comprises an equalizing charging time period and a floating charging time period, and the overall charging current obtained in the equalizing charging time period is larger than the overall charging current obtained in the floating charging time period. The fifth time period is any one of the floating charge time periods, and meanwhile, the fifth time period is also in the discharge time period, that is, in the fifth time period, the battery pack is in a charging (floating charge) state and a discharging state at the same time. In addition, in the embodiment of the present application, the total discharge current obtained in the fifth period of time at least includes 600, that is, when the preset time period is 1s, the time length of the fifth period of time is at least 5 min.
In step S252, the overall charging capacity of the battery pack in the fifth time period is obtained according to the plurality of overall charging currents of the battery pack.
Also, in the embodiment of the present application, the overall charging capacity may be obtained according to the time length of the fifth time period and the average value of all the overall charging currents of the battery pack in the fifth time period.
In step S253, a power difference between the overall charging power and the overall discharging power is obtained.
And step S254, when the electric quantity difference value and the rated capacity of the battery pack satisfy a fourth preset relationship, generating a floating charge abnormality prompt message as a second monitoring result.
In this embodiment of the application, the fourth preset relationship may be:
C3＞yC4
wherein, C3Is the difference of electric quantity, C4Y may be 20% but is not limited to 20% for the rated capacity of the battery pack.
After the second monitoring result is obtained, it can be determined that the battery pack cannot be normally used, and thus, the technical effect of accurately obtaining the state monitoring result of the battery pack is achieved by ensuring the comprehensiveness of the state monitoring result.
In this embodiment, the state monitoring result may further include a third monitoring result, which is used to represent a real available time of the battery pack.
Referring to fig. 10, to implement the above inventive concept, as a sixth implementation manner, in the embodiment of the present application, the step S200 may include three sub-steps, i.e., a step S261, a step S262, and a step S263.
Step S261, obtaining a theoretical usable time of the battery pack according to the overall state information of the battery pack.
Referring to fig. 11, in the embodiment of the present application, step S261 may further include four sub-steps, i.e., step S2611, step S2612, step S2613, and step S2614.
In step S2611, the initial capacity of the battery pack over a historical period of time is obtained.
In step S2612, the current capacity of the battery pack is obtained according to the initial capacity of the battery pack, a plurality of overall discharge currents of the battery pack, and a plurality of overall charge currents of the battery pack.
In the embodiment of the present application, an average value of a plurality of overall discharging currents of the battery pack may be obtained, an overall discharging electric quantity may be obtained according to the average value of the plurality of overall discharging currents and the overall discharging time, and simultaneously, an average value of a plurality of overall charging currents of the battery pack may be obtained, an overall charging electric quantity may be obtained according to the average value of the plurality of overall charging currents and the overall charging time, and thereafter, a current electric capacity of the battery pack may be obtained according to the initial electric capacity, the overall discharging electric quantity, and the overall charging electric quantity.
In step S2613, the present discharging current of the battery pack is selected from the plurality of overall discharging currents of the battery pack.
In the embodiment of the application, the current discharge current is the whole discharge current with the most backward time among the plurality of whole discharge currents.
In step S2614, the theoretical usable time of the battery pack is obtained according to the current discharging current of the battery pack and the current capacity of the battery pack.
In the embodiment of the present application, the theoretical usable time is a quotient value of the current capacity of the battery pack and the current discharge current, that is:
T1＝C/I
wherein, T1For the theoretical usable time, C is the present capacitance and I is the present discharge current.
In step S262, the predicted available time of the battery pack is obtained based on the overall state information of the battery pack.
Referring to fig. 12, in the embodiment of the present application, the step S262 may further include three sub-steps, namely a step S2621, a step S2622, and a step S2623.
In step S2621, the historical monitoring period of the battery pack is divided into a plurality of sub-periods.
In the embodiment of the present application, when the preset time length is 1s, the time length of each sub-period may be 1s, but is not limited to 1 s.
Step S2622, obtaining a third voltage drop rate of the battery pack in each sub-period according to the plurality of overall discharge voltages of the battery pack.
In the embodiment of the present application, the third voltage drop rate of the battery pack in each sub-period may be obtained according to a plurality of overall discharge voltages of the battery pack based on the following operation logic.
ak(n)＝(U(n-1)-U(n))/U(n-1)
And ak (n) is a third voltage reduction rate of the battery pack in the nth sub-period, U (n-1) is the overall discharge voltage of the battery pack at the (n-1) s moment, and U (n) is the overall discharge voltage of the battery pack at the ns moment.
In step S2623, a predicted available time of the battery pack is obtained according to the plurality of overall discharge voltages of the battery pack and the third voltage drop rate of the battery pack in each sub-period.
In the embodiment of the present application, the predicted available time of the battery pack may be obtained based on the following operation logic, according to a plurality of overall discharge voltages of the battery pack, and the third voltage drop rate of the battery pack in each sub-period.
Figure BDA0002068244770000181
Wherein, T2To predict the available time, u (n) is the overall discharge voltage of the battery pack at the time ns,ak (n) is a third voltage drop rate of the battery pack during the nth sub-period. In addition, in the embodiment of the present application, u (n) is less than or equal to the cut-off voltage, and the cut-off voltage may be set according to actual requirements, for example, may be set to 10.8V, but is not limited to 10.8V.
Step S263, obtaining the real available time of the battery pack as a third monitoring result according to the theoretical available time and the predicted available time.
In the embodiment of the present application, the actual available time of the battery pack may be obtained as the third monitoring result based on the following operation logic according to the theoretical available time and the predicted available time.
T＝aT1+bT2
Wherein T is the real available time, T1To the theoretical usable time, T2In order to predict the available time, a is a first weight value, b is a second weight value, the sum of a and b is 1, and the specific values of a and b may be set according to actual requirements, which is not specifically limited in the embodiment of the present application.
In the embodiment of the present application, the actual available time as the third monitoring result is obtained from the theoretical available time and the predicted available time, and therefore, the accuracy is high.
In this embodiment, the state monitoring result may further include a fourth monitoring result, which is used to characterize the heat generation condition of the battery pack.
In order to implement the above inventive concept, as a seventh implementation manner, in this embodiment of the application, the step S200 may include generating temperature early warning information as a fourth monitoring result when a single battery with a surface temperature greater than a preset temperature threshold exists in all the single batteries.
After the fourth monitoring result is obtained, the single battery with the surface temperature greater than the preset temperature threshold can be determined according to the fourth monitoring result, so that the temperature of the single battery can be reduced in a targeted manner. Therefore, the technical effect of accurately obtaining the state monitoring result of the battery pack is achieved by ensuring the comprehensiveness of the state monitoring result, and the single battery with the surface temperature larger than the preset temperature threshold value can be cooled in time and pertinently, so that the overall service life of the battery pack is prolonged.
In this embodiment, the state monitoring result may further include a fifth monitoring result, which is used to represent the number of times the load device is operable.
To achieve the above inventive concept, as an eighth implementation manner, in this application example, the step S200 may include obtaining the number of times the load device is operable as a fifth monitoring result according to the current capacity of the battery pack and the single-operation power consumption of the load device.
The single-operation electricity usage of the load equipment may be obtained from the actual power value of the load equipment and the operation time period required for the single operation. The actual power value of the load power is an average value of power values corresponding to all sampling time points in a single operation process of the load equipment.
Through the setting, be used for providing the power supply for transportation system when the group battery, for example, provide the power supply for subway switch switching equipment, also promptly, load equipment is when subway switch switching equipment, just can be according to the fifth monitoring result, obtains the operatable number of times that subway switch switches over to remind the staff before the condition that the operatable number of times is zero takes place, change the group battery, or charge the group battery, thereby avoid because subway switch switching equipment working property reduces, and the potential safety hazard that arouses takes place.
To sum up, the battery pack state monitoring method and system provided by the embodiment of the application can obtain the overall state information of the battery pack through the first sensing device and send the overall state information to the monitoring host, obtain the monomer state information of the corresponding monomer battery through each second sensing device and send the monomer state information to the monitoring host, and the monitoring host obtains the state monitoring result of the battery pack according to the overall state information of the battery pack and the monomer state information of each monomer battery.
In the embodiments provided in the present application, it should be understood that the disclosed method can be implemented in other ways. The above-described apparatus embodiments are merely illustrative, for example, the flowcharts in the figures illustrate the architecture, functionality, and operation of possible implementations of methods according to various embodiments of the present application. In this regard, each block in the flowchart may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or by combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Furthermore, it should be further noted that, in this document, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (8)

1. A battery pack state monitoring method is applied to a monitoring host, and comprises the following steps:
acquiring the overall state information of a battery pack in a historical monitoring time period and the single state information of each single battery in the battery pack;
acquiring a state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery;
the state monitoring result includes a third monitoring result, and the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery includes:
obtaining theoretical available time of the battery pack according to the overall state information of the battery pack;
obtaining the predicted available time of the battery pack according to the overall state information of the battery pack;
obtaining the real available time of the battery pack according to the theoretical available time and the predicted available time, and using the real available time as a third monitoring result;
the obtaining of the predicted available time of the battery pack based on the overall state information of the battery pack includes:
dividing a historical monitoring time period of the battery pack into a plurality of sub-time periods;
obtaining a third voltage drop rate of the battery pack in each sub-period according to a plurality of overall discharge voltages of the battery pack;
obtaining a predicted available time of the battery pack according to a plurality of overall discharge voltages of the battery pack and a third voltage drop rate of the battery pack in each sub-time period;
the state monitoring result includes a fifth monitoring result, and the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery includes:
the number of times the load device is operable is obtained as a fifth monitoring result on the basis of the current capacity of the battery pack and the single-operation power usage of the load device.
2. The battery pack state monitoring method according to claim 1, wherein the overall state information includes a plurality of overall discharge voltages, the cell state information includes a plurality of cell discharge voltages, and the state monitoring result includes a first monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining a first voltage drop rate of the battery pack in a first time period according to a plurality of overall discharge voltages of the battery pack;
obtaining a second voltage drop rate of each single battery in a first time period according to a plurality of single discharge voltages of each single battery;
and when a second voltage reduction rate meeting a first preset relation with the first voltage reduction rate exists in the second voltage reduction rates of all the single batteries, generating single battery replacement prompt information as the first monitoring result.
3. The battery pack state monitoring method according to claim 1, wherein the cell state information includes a plurality of cell internal resistances, and the state monitoring result includes a first monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the increase rate of the internal resistance of each single battery in a second time period according to the internal resistance of the single batteries, wherein the battery pack is in a floating charge state in the second time period;
obtaining the average internal resistance increasing rate of all the single batteries in the second time period according to the internal resistance increasing rates of all the single batteries in the second time period;
and when the increase rate of the internal resistance of the single battery in all the single batteries meets a second preset relation with the average increase rate of the internal resistance, generating a single battery replacement prompt message as the first monitoring result.
4. The battery pack state monitoring method according to claim 1, wherein the cell state information includes a plurality of cell internal resistances, and the state monitoring result includes a first monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the increase rate of the internal resistance of each single battery in a third time period according to the internal resistance of a plurality of single batteries of each single battery, wherein the battery pack is in a floating charge state in the third time period;
and when the increase rate of the internal resistance of the single battery is greater than a preset increase rate threshold value, generating a change prompt message of the single battery as the first monitoring result.
5. The battery pack state monitoring method according to claim 1, wherein the overall state information includes a plurality of overall discharge currents and a plurality of overall charge currents, and the state monitoring result includes a second monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the overall discharge electric quantity of the battery pack in a fourth time period according to a plurality of overall discharge currents of the battery pack, wherein the battery pack is in a float charging state in the fourth time period;
obtaining the integral charging electric quantity of the battery pack in a fourth time period according to a plurality of integral charging currents of the battery pack;
and when the whole discharging electric quantity and the whole charging electric quantity meet a third preset relation, generating a floating charge abnormity prompting message as the second monitoring result.
6. The battery pack state monitoring method according to claim 1, wherein the overall state information includes a plurality of overall discharge currents and a plurality of overall charge currents, and the state monitoring result includes a second monitoring result;
the obtaining of the state monitoring result of the battery pack according to the overall state information of the battery pack and the single state information of each single battery comprises:
obtaining the integral discharge electric quantity of the battery pack in a fifth time period according to a plurality of integral discharge currents of the battery pack, wherein the battery pack is in a floating charge state in the fifth time period;
obtaining the integral charging electric quantity of the battery pack in a fifth time period according to the plurality of integral charging currents of the battery pack;
obtaining an electric quantity difference value between the whole charging electric quantity and the whole discharging electric quantity;
and when the electric quantity difference value and the rated capacity of the battery pack meet a fourth preset relation, generating a floating charge abnormity prompting message as the second monitoring result.
7. The battery pack state monitoring method according to claim 1, wherein the overall state information includes a plurality of overall discharge currents and a plurality of overall charge currents;
the obtaining of the theoretical usable time of the battery pack according to the overall state information of the battery pack includes:
obtaining an initial capacity of the battery pack over a historical period of time;
obtaining a current capacity of the battery pack according to the initial capacity of the battery pack, a plurality of overall discharge currents of the battery pack and a plurality of overall charging currents of the battery pack;
selecting a current discharge current of the battery pack from a plurality of overall discharge currents of the battery pack;
and obtaining the theoretical usable time of the battery pack according to the current discharge current of the battery pack and the current capacity of the battery pack.
8. A battery pack state monitoring system is characterized in that the battery pack state monitoring system is used for monitoring the state of a battery pack, the battery pack comprises M single batteries, the battery pack state monitoring system comprises a first sensing device, a second sensing device and a monitoring host machine, the first sensing device is respectively connected with the monitoring host machine and the battery pack, the number of the second sensing devices is M, the M second sensing devices correspond to the M single batteries one by one, and each second sensing device is respectively connected with the monitoring host machine and the corresponding single battery;
the first sensing device is used for acquiring the overall state information of the battery pack and sending the overall state information to the monitoring host;
each second sensing device is used for obtaining monomer state information of the corresponding monomer battery and sending the monomer state information to the monitoring host;
the monitoring host is used for executing the battery pack state monitoring method of any one of claims 1-7.
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