CN110614936A - Remote online equalization method and device for battery pack - Google Patents

Remote online equalization method and device for battery pack Download PDF

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Publication number
CN110614936A
CN110614936A CN201910990568.5A CN201910990568A CN110614936A CN 110614936 A CN110614936 A CN 110614936A CN 201910990568 A CN201910990568 A CN 201910990568A CN 110614936 A CN110614936 A CN 110614936A
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China
Prior art keywords
battery
equalization
detection module
temperature
switches
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CN201910990568.5A
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CN110614936B (en
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龚政
胡耀华
李勇
陈智
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Nawei Technology Chengdu Co ltd
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Hunan Small Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a remote online equalization method and a remote online equalization device for a power battery pack, wherein the method comprises the following steps: receiving battery data uploaded by the vehicle-mounted terminal during discharging and a temperature value of a PCB (printed Circuit Board) end of a battery detection module during discharging in real time; according to the battery data, the platform server carries out SOH estimation on each single battery, then carries out analysis according to the SOH estimation data of the single batteries and the battery data, and confirms the positions and the quantity of the unbalanced single batteries; the platform server calculates the number N of equalization switches needed to be started by the battery detection module according to the PCB temperature value of the battery detection module; and the battery detection module starts an equalization switch for the single battery needing equalization according to the voltage of the single battery. According to the invention, the platform server can reduce the pressure difference of the battery in the using process caused by individual difference in the battery charging and discharging process, control the speed of increasing the pressure difference of the battery, and solve the technical problem of poor effect of improving the consistency of the battery pack.

Description

Remote online equalization method and device for battery pack
Technical Field
The invention relates to the technical field of new energy automobile parts, in particular to a remote online equalization method and device for a battery pack.
Background
Because individual differences exist among the single batteries in the battery pack, after the battery pack is used for a long time, the pressure difference of the single batteries is increased, so that the consistency of the battery pack is gradually deteriorated, and therefore when the batteries are charged, part of the batteries are fully charged to reach the protection voltage, and part of the batteries are still not fully charged, and when the batteries are discharged, part of the batteries are completely discharged to reach the protection voltage, and part of the batteries are not completely discharged, so that the cruising ability of the battery pack is finally influenced; only a part of manufacturers of the battery management system in the current market provide a passive equalization function for controlling gradual deterioration of consistency of the battery pack, in the equalization process, the equalization current is small, so that the effect of improving the consistency of the battery pack is poor in the actual use process of a vehicle, and meanwhile, the battery management system does not support remote data analysis and algorithm adjustment in the passive equalization process.
Disclosure of Invention
The invention provides a remote online equalization method and a remote online equalization device for a battery pack, which can reduce the pressure difference of a battery in the using process caused by individual difference in the battery charging and discharging process through a platform server, control the speed of increasing the pressure difference of the battery, and solve the technical problem of poor effect of improving the consistency of the battery pack.
The technical scheme of the invention is as follows:
a remote online equalization method of a power battery pack comprises the following steps:
receiving battery data during discharge and a PCB temperature value of a battery detection module during discharge, wherein the battery data comprises single battery voltage, electric quantity of the single battery, discharge times and environment temperature;
according to the battery data, the platform server carries out SOH estimation on each single battery, and then carries out analysis according to the SOH estimation data of the single batteries and the battery data; through the step, the positions and the number of the unbalanced single batteries and the positions and the number of the single batteries needing to be balanced can be confirmed;
the platform server calculates the number N of equalization switches required to be started by the battery detection module according to the temperature value of the PCB end of the battery detection module, and then transmits the number N of the equalization switches to the battery management module through the vehicle-mounted terminal;
the battery detection module acquires the number N of the starting equalization switches transmitted by the battery management module, and starts the equalization switches for the single batteries needing equalization according to the voltage of the single batteries.
Further, the platform server estimates the battery SOH according to the battery data, and the method comprises the following steps:
obtaining real-time discharge amount, last discharge amount, environment temperature record value and discharge times n during discharge, calculating depth of discharge DOD and average environment temperature t, and further calculating to obtain cycle life value of single battery；
And (3) carrying out SOH estimation on the single battery, wherein the estimation formula is as follows:。
further, the platform server calculates the number N of equalization switches that need to be opened by the battery detection module according to the PCB board end temperature value of the battery detection module, and includes:
judging whether the temperature T of the PCB end of the battery detection module is greater than a first preset temperature threshold value T or not and judging whether the temperature T of the PCB end is less than a second preset temperature threshold value T or not1；
The temperature T at the end of the PCB is greater than a first preset temperature threshold T and less than a second preset temperature threshold T1Under the condition of (1), the calculation method of the number N of the started equalization switches comprises the following steps:k is the number of single batteries connected with each battery detection module, and t is a first preset temperature threshold;
under the condition that the temperature T of the PCB end is less than a preset temperature threshold T, the number N of started equalization switches is equal to the total number M of equalization switches of the battery detection module;
the temperature T at the end of the PCB is greater than a second preset temperature threshold T1In this case, the number N of equalization switches turned on is equal to 0.
Further, the battery detection module opens the equalization switch to the single battery needing equalization according to the voltage of the single battery, and the method comprises the following steps:
the battery detection module acquires the minimum voltage value of the single batteries in the battery pack, and takes the difference value between the voltage value of each single battery and the minimum voltage value as a balance threshold value;
judging whether the voltage of a single battery in the battery pack is greater than a balance threshold value, if so, starting a balance switch of the single battery in the battery pack;
and counting the number of the opened equalization switches, and controlling the number of the opened equalization switches to be less than or equal to the total number M of the equalization switches.
The invention also provides a remote online balancing device of the power battery pack, which comprises a battery management module, a battery detection module and a platform server.
The platform server is used for receiving battery data uploaded by the vehicle-mounted terminal in a discharging period and a temperature value of a PCB (printed Circuit Board) end of the battery detection module in the discharging period in real time;
the system is also used for estimating the SOH of each single battery according to the battery data, analyzing according to the SOH estimation data of the single batteries and the battery data, and confirming the positions and the number of the unbalanced single batteries and the positions and the number of the single batteries needing to be equalized;
the battery management module is also used for calculating the number N of equalization switches required to be started by the battery detection module according to the temperature value of the PCB end of the battery detection module, and then transmitting the number N of the equalization switches to the battery management module through the vehicle-mounted terminal;
the battery management module is used for receiving the information of the number of the equalization switches needing to be started by the battery detection module and transmitting the information to the battery detection module;
and the battery detection module is used for acquiring the number N of the starting equalization switches transmitted by the battery management module and starting the equalization switches for the single batteries needing equalization according to the voltage of the single batteries.
Further, the platform server comprises a battery SOH estimation module;
the battery SOH estimation module is used for acquiring the real-time discharge amount, the last discharge amount, the environment temperature record value and the discharge times n during the discharge period, calculating the depth of discharge DOD and the average environment temperature t, and further calculating to obtain the cycle life value of the single battery(ii) a And (3) carrying out SOH estimation on the single battery, wherein the estimation formula is as follows:。
further, the platform server comprises a balance switch starting number calculating module;
a PCB end temperature judgment module for judging whether the PCB end temperature T of the battery detection module is greater than a first preset temperature threshold value T and whether the PCB end temperature T is less than a second preset temperature threshold value T1；
The equalization switch starting number calculation module is used for calculating the temperature T of the PCB end which is greater than a first preset temperature threshold T and less than a second preset temperature threshold T1Under the condition of (1), the calculation method of the number N of the started equalization switches comprises the following steps:k is the number of single batteries connected with each battery detection module, and t is a first preset temperature threshold;
under the condition that the temperature T of the PCB end is less than a preset temperature threshold T, the number N of started equalization switches is equal to the total number M of equalization switches of the battery detection module;
the temperature T at the end of the PCB is greater than a second preset temperature threshold T1In this case, the number N of equalization switches turned on is equal to 0.
Further, the battery detection module includes:
the battery pack balancing device comprises an acquisition unit, a balancing unit and a balancing unit, wherein the acquisition unit is used for acquiring the minimum voltage value of single batteries in a battery pack and taking the difference between the voltage value of each single battery and the minimum voltage value as a balancing threshold;
the judging unit is used for judging whether the voltage of the single battery in the battery pack is larger than a balance threshold value or not, and if so, starting a balance switch of the single battery in the battery pack;
and counting the total number of the started equalization switches, and controlling the number N of the started equalization switches to be less than or equal to the total number M of the equalization switches.
The technical principle of the invention is as follows:
firstly, receiving battery data and a temperature value of a PCB (printed Circuit Board) end of a battery detection module during discharging of a power battery pack uploaded by a vehicle-mounted terminal in real time, and analyzing according to battery SOH estimation data and the battery data to confirm the positions and the number of unbalanced single batteries; then, according to the PCB temperature value of the battery detection module, the number N of equalization switches needing to be started by the battery detection module is calculated, and the equalization switches are transmitted to the battery management module through the vehicle-mounted terminal; finally, the battery detection module acquires the number N of started equalization switches transmitted by the battery management module, and starts the equalization switches for the single batteries needing equalization according to the voltage of the single batteries; therefore, the invention not only can carry out remote online equalization on the single batteries in the power battery pack, but also can carry out remote online analysis on battery data and adjustment on an equalization algorithm; meanwhile, in the balancing process, the situation that the voltage is high due to poor performance, the voltage is good, the voltage is low, and the like, and the speed of aggravating the deterioration of the battery pack caused by the fact that the balancing operation is carried out by mistake can be avoided.
The invention has the following beneficial effects:
1. compared with the traditional passive equalization or active equalization method, the remote online equalization method has the advantages that the platform server analyzes according to a large amount of battery related data and the battery health state estimation result, so that the condition that the deterioration speed of the battery pack is aggravated due to the fact that individual batteries (poor in performance, high in voltage, good in performance, low in voltage and the like) are subjected to equalization operation by mistake can be avoided, the positions of single batteries needing equalization in the battery detection module and the number of the single batteries can be confirmed, and the remote adjustment and control of the battery equalization are realized;
2. according to the remote online balancing method, in the process of confirming the positions of the single batteries and the number of the single batteries, the number of the single batteries to be balanced can be properly increased according to the temperature change (such as low environmental temperature or slow temperature rise after balancing is started) of the PCB end of the battery detection module.
3. The remote online equalization method can improve at least 80% of effective equalization time, remarkably improve the equalization effect in unit time, greatly control the pressure difference among batteries and slow down the deterioration speed of the battery pack.
4. The remote online balancing method has high stability and reliability, and can perform balancing operation when the vehicle runs or is in a static state.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a remote online balancing method for a power battery pack according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of estimating SOH of the battery of FIG. 1;
FIG. 3 is a flow chart of a method for turning on an equalization switch for the single battery to be equalized in FIG. 1;
fig. 4 is a schematic diagram of a remote online balancing device for a power battery pack according to an embodiment of the invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1, a remote online balancing method for a power battery pack is applied to a battery management system, and comprises the following steps:
s101: receiving battery data during discharge and a PCB temperature value of a battery detection module during discharge, wherein the battery data is uploaded by a vehicle-mounted terminal and comprises single battery voltage, the discharge capacity of the single battery, the discharge times and the environment temperature;
s102: the platform server estimates the SOH of the battery according to the battery data, analyzes the battery SOH estimation data and the battery data, and respectively confirms the positions and the quantity of the single batteries which are unbalanced and need to be balanced;
s103: the platform server calculates the number N of equalization switches required to be started by the battery detection module according to the PCB temperature value of the battery detection module, and transmits the equalization switches to the battery management module through the vehicle-mounted terminal;
s104: the battery detection module acquires the balance switch starting number information transmitted by the battery management module, and starts the balance switches for the single batteries needing to be balanced according to the voltage of the single batteries.
Preferably, the platform server estimates the SOH of the battery according to the battery data, as shown in fig. 2, and includes the following steps:
s10201: acquiring real-time discharge amount, electric quantity at last moment, environment temperature record value and discharge times n during discharge, calculating depth of discharge DOD and average environment temperature t, and further calculating to obtain cycle life value of single battery。
Specifically, in this embodiment, the step includes:
the battery detection module can detect and judge the charge-discharge state of the battery pack, records the discharge capacity, voltage, discharge times, battery environmental temperature and other battery data of the single battery in real time in the discharge state, and uploads the battery data to the platform server through the battery management module in real time.
The platform server acquires and records the electric quantity of the single battery, and when the difference value between the electric quantity at the current moment and the electric quantity recorded at the last moment is greater than 20%, the DOD of the single battery starts to be calculated, and the calculation mode is as follows: the depth of discharge DOD = (last recorded charge-current charge)/rated capacity of the cell.
And calculating the average ambient temperature of the single batteries according to the ambient temperatures of the single batteries recorded for a plurality of times during discharging.
Calculating the cycle life value of the single batteryWherein x is the depth of discharge DOD at the time of the nth discharge, t is the ambient average temperature,in order to achieve a cycle life,is the percentage of life; specifically, when counting the number of discharges each time, there will be different depths of discharge DOD, and the cycle lives corresponding to the different depths of discharge DOD are different, and in this embodiment, there is a linear relationship between the depths of discharge DOD and the cycle lives, that is, there is a linear relationship between the depths of discharge DOD and the cycle livesEtc.; in this embodiment, the ambient temperature and the percentage of life are in two-stage linear relationship, when the temperature is less than 25 ℃, b (t) = (t +75)/100, and when the temperature is greater than 25 ℃, b (t) = (160-2.4 t)/100; through the formula, the cycle life value of the single battery can be calculated。
S10202: and (3) carrying out SOH estimation on the single battery, wherein the estimation formula is as follows:where n is the number of discharges.
Preferably, the platform server calculates the number N of equalization switches needed to be opened by the battery detection module according to the PCB end temperature value of the battery detection module, and includes the following steps:
when the temperature T of the PCB end of the battery management module is largeAt a first predetermined temperature threshold t1And is less than a second predetermined temperature threshold t2The method for calculating the total number of the opened equalization switches comprises the following steps:
wherein K is the number of the single batteries connected with each battery detection module, t1Is a first preset temperature threshold.
When the temperature T of the PCB end of the battery management module is less than a preset temperature threshold T1When the battery is detected, the total number of the started equalization switches is M, and M is the total number of the equalization switches of the battery detection module; when the temperature T of the PCB end of the battery management module is greater than a second preset temperature threshold T2The total number of the balance switches which are turned on is 0.
In this embodiment, t is1Set to 30 deg.C and a second preset temperature threshold t2Setting the temperature to be 60 ℃; when the temperature of the plate end of the battery detection module is less than 30 ℃, all balance switches of the battery detection module can be opened; if the temperature of the plate end of the battery detection module is higher than 60 ℃, any balance switch of the battery detection module cannot be started; and if the temperature of the battery detection module board end is between 30 ℃ and 60 ℃, the total number of the started equalization switches is calculated according to the step S10301.
Preferably, as shown in fig. 3, the turning on of the balancing switch for the single battery to be balanced by the battery detection module according to the voltage of the single battery includes:
s10301: the battery detection module acquires the minimum voltage value of the single batteries in the battery pack, and takes the difference between the voltage value of each single battery and the minimum voltage value as a balance threshold value.
S10302: the battery detection module judges whether the voltage of the single battery in the battery pack is larger than a balance threshold value or not, and if so, the balance switch of the single battery in the battery pack is turned on.
S10303: the battery detection module counts the total number of the started equalization switches and controls the total number of the started equalization switches to be smaller than or equal to the total number of the equalization switches.
To sum up, the embodiment of the invention estimates the SOH of the battery and calculates the number N of the equalization switches needed to be started by the battery detection module by receiving the battery data uploaded by the vehicle-mounted terminal and the temperature value at the PCB end of the battery detection module in real time, and then controls the battery detection module to start the equalization switches needed to be started by the equalization cells according to the voltage of the cells.
As shown in fig. 4, the present invention further provides a remote online balancing apparatus for a power battery pack, which includes a battery management module, a battery detection module and a platform server.
The platform server is used for receiving battery data uploaded by the vehicle-mounted terminal in a discharging period and a temperature value of a PCB (printed Circuit Board) end of the battery detection module in the discharging period in real time;
the system is also used for estimating the SOH of each single battery according to the battery data, analyzing according to the SOH estimation data of the single batteries and the battery data, and confirming the positions and the number of the unbalanced single batteries and the positions and the number of the single batteries needing to be equalized;
the battery management module is also used for calculating the number N of equalization switches required to be started by the battery detection module according to the temperature value of the PCB end of the battery detection module, and then transmitting the number N of the equalization switches to the battery management module through the vehicle-mounted terminal;
the battery management module is used for receiving the information of the number of the equalization switches needing to be started by the battery detection module and transmitting the information to the battery detection module;
and the battery detection module is used for acquiring the number N of the starting equalization switches transmitted by the battery management module and starting the equalization switches for the single batteries needing equalization according to the voltage of the single batteries.
Preferably, the platform server comprises a battery SOH estimation module;
battery SOH estimation moduleThe block is used for acquiring the real-time discharge amount, the last discharge amount, the environment temperature recorded value and the discharge times n during the discharge period, calculating the depth of discharge DOD and the average environment temperature t, and further calculating to obtain the cycle life value of the single battery(ii) a And (3) carrying out SOH estimation on the single battery, wherein the estimation formula is as follows:。
preferably, the platform server comprises a balance switch starting number calculation module;
a PCB end temperature judgment module for judging whether the PCB end temperature T of the battery detection module is greater than a first preset temperature threshold value T and whether the PCB end temperature T is less than a second preset temperature threshold value T1；
The equalization switch starting number calculation module is used for calculating the temperature T of the PCB end which is greater than a first preset temperature threshold T and less than a second preset temperature threshold T1Under the condition of (1), the calculation method of the number N of the started equalization switches comprises the following steps:k is the number of single batteries connected with each battery detection module, and t is a first preset temperature threshold;
under the condition that the temperature T of the PCB end is less than a preset temperature threshold T, the number N of started equalization switches is equal to the total number M of equalization switches of the battery detection module;
the temperature T at the end of the PCB is greater than a second preset temperature threshold T1In this case, the number N of equalization switches turned on is equal to 0.
Preferably, the battery detection module includes:
the battery pack balancing device comprises an acquisition unit, a balancing unit and a balancing unit, wherein the acquisition unit is used for acquiring the minimum voltage value of single batteries in a battery pack and taking the difference between the voltage value of each single battery and the minimum voltage value as a balancing threshold;
the judging unit is used for judging whether the voltage of the single battery in the battery pack is larger than a balance threshold value or not, and if so, starting a balance switch of the single battery in the battery pack;
and the counting unit is used for counting the number of the opened equalization switches and controlling the number of the opened equalization switches to be less than or equal to the total number M of the equalization switches.
The remote online balancing device for the power battery pack provided by the invention has the same technical concept and the same beneficial effects as the remote online balancing method for the power battery pack, and the detailed description is omitted here.

Claims (8)

1. A method for remote online equalization of a power battery pack, the method comprising the steps of:
receiving battery data during discharge and a PCB temperature value of a battery detection module during discharge, wherein the battery data comprises single battery voltage, electric quantity of a single battery, discharge times and environment temperature, and the battery data is uploaded by a vehicle-mounted terminal in real time;
according to the battery data, the platform server carries out SOH estimation on each single battery, then carries out analysis according to the SOH estimation data of the single batteries and the battery data, and confirms the positions and the number of the unbalanced single batteries and the positions and the number of the single batteries needing to be equalized;
the platform server calculates the number N of equalization switches required to be started by the battery detection module according to the temperature value of the PCB end of the battery detection module, and then transmits the number N of the equalization switches to the battery management module through the vehicle-mounted terminal;
the battery detection module acquires the number N of the starting equalization switches transmitted by the battery management module, and starts the equalization switches for the single batteries needing equalization according to the voltage of the single batteries.
2. The method for remote online equalization of a power battery pack according to claim 1, characterized in that:
the platform server estimates the SOH of the battery according to the battery data, and comprises the following steps:
obtaining real-time discharge amount during discharge, discharge amount at last moment and environmentThe temperature record value and the discharge times n are calculated, the DOD and the average ambient temperature t are calculated, and the cycle life value of the single battery is further calculated；
And (3) carrying out SOH estimation on the single battery, wherein the estimation formula is as follows:。
3. the method for remote online equalization of a power battery pack according to claim 1, characterized in that:
the platform server calculates the number N of the balance switches needed to be opened by the battery detection module according to the temperature value of the PCB end of the battery detection module, and the method comprises the following steps:
judging whether the temperature T of the PCB end of the battery detection module is greater than a first preset temperature threshold value T or not and judging whether the temperature T of the PCB end is less than a second preset temperature threshold value T or not1；
The temperature T at the end of the PCB is greater than a first preset temperature threshold T and less than a second preset temperature threshold T1Under the condition of (1), the calculation method of the number N of the started equalization switches comprises the following steps:k is the number of single batteries connected with each battery detection module, and t is a first preset temperature threshold;
under the condition that the temperature T of the PCB end is less than a preset temperature threshold T, the number N of started equalization switches is equal to the total number M of equalization switches of the battery detection module;
the temperature T at the end of the PCB is greater than a second preset temperature threshold T1In this case, the number N of equalization switches turned on is equal to 0.
4. The remote online equalization method of power battery packs according to claim 1, wherein the battery detection module starts an equalization switch for the single battery to be equalized according to the voltage of the single battery, and the method comprises the following steps:
the battery detection module acquires the minimum voltage value of the single batteries in the battery pack, and takes the difference value between the voltage value of each single battery and the minimum voltage value as a balance threshold value;
judging whether the voltage of a single battery in the battery pack is greater than a balance threshold value, if so, starting a balance switch of the single battery in the battery pack;
and counting the number of the opened equalization switches, and controlling the number of the opened equalization switches to be less than or equal to the total number M of the equalization switches.
5. The utility model provides a long-range online balancing unit of power battery group, including battery management module, battery detection module and platform server, its characterized in that:
the platform server is used for receiving battery data uploaded by the vehicle-mounted terminal in a discharging period and a temperature value of a PCB (printed Circuit Board) end of the battery detection module in the discharging period in real time;
the system is also used for estimating the SOH of each single battery according to the battery data, analyzing according to the SOH estimation data of the single batteries and the battery data, and confirming the positions and the number of the unbalanced single batteries and the positions and the number of the single batteries needing to be equalized;
the battery management module is also used for calculating the number N of equalization switches required to be started by the battery detection module according to the temperature value of the PCB end of the battery detection module, and then transmitting the number N of the equalization switches to the battery management module through the vehicle-mounted terminal;
the battery management module is used for receiving the information of the number of the equalization switches needing to be started by the battery detection module and transmitting the information to the battery detection module;
and the battery detection module is used for acquiring the number N of the starting equalization switches transmitted by the battery management module and starting the equalization switches for the single batteries needing equalization according to the voltage of the single batteries.
6. The remote on-line balancing apparatus for power battery packs according to claim 5, wherein the platform server comprises a battery SOH estimation module;
the battery SOH estimation module is used for acquiring the real-time discharge amount, the last discharge amount, the environment temperature record value and the discharge times n during the discharge period, calculating the depth of discharge DOD and the average environment temperature t, and further calculating to obtain the cycle life value of the single battery(ii) a And (3) carrying out SOH estimation on the single battery, wherein the estimation formula is as follows:。
7. the remote online equalization device of power battery packs according to claim 5, wherein the platform server comprises an equalization switch opening number calculation module;
the PCB end temperature judgment module is used for judging whether the PCB end temperature T of the battery detection module is greater than a first preset temperature threshold value T or not and judging whether the PCB end temperature T is less than a second preset temperature threshold value T or not1；
The equalization switch starting number calculation module is used for calculating the temperature T of the PCB end which is greater than a first preset temperature threshold T and less than a second preset temperature threshold T1Under the condition of (1), the calculation method of the number N of the started equalization switches comprises the following steps:k is the number of single batteries connected with each battery detection module, and t is a first preset temperature threshold;
under the condition that the temperature T of the PCB end is less than a preset temperature threshold T, the number N of started equalization switches is equal to the total number M of equalization switches of the battery detection module;
the temperature T at the end of the PCB is greater than a second preset temperature threshold T1In this case, the number N of equalization switches turned on is equal to 0.
8. The remote online equalization apparatus of power battery packs according to claim 5, wherein the battery detection module comprises:
the battery pack balancing device comprises an acquisition unit, a balancing unit and a balancing unit, wherein the acquisition unit is used for acquiring the minimum voltage value of single batteries in a battery pack and taking the difference between the voltage value of each single battery and the minimum voltage value as a balancing threshold;
the judging unit is used for judging whether the voltage of the single battery in the battery pack is larger than a balance threshold value or not, and if so, starting a balance switch of the single battery in the battery pack;
and the counting unit is used for counting the number of the opened equalization switches and controlling the number of the opened equalization switches to be less than or equal to the total number M of the equalization switches.
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