CN112339610B - New energy vehicle power battery charging and discharging control system and method - Google Patents

New energy vehicle power battery charging and discharging control system and method Download PDF

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CN112339610B
CN112339610B CN202011178308.7A CN202011178308A CN112339610B CN 112339610 B CN112339610 B CN 112339610B CN 202011178308 A CN202011178308 A CN 202011178308A CN 112339610 B CN112339610 B CN 112339610B
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power battery
charging
current
battery
discharging current
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CN112339610A (en
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何春芳
杨军
徐硕
黄新
郑晓荷
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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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
    • 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]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • 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)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention designs a new energy vehicle power battery charging and discharging control system, which comprises a battery performance influence factor calculation module, a power battery use environment influence factor calculation module, a whole vehicle demand performance influence factor calculation module, an in-vehicle electric equipment influence factor calculation module and a power battery charging and discharging current correction module.

Description

New energy vehicle power battery charging and discharging control system and method
Technical Field
The invention relates to the technical field of new energy automobile battery control, in particular to a new energy automobile power battery charging and discharging control system and method.
Technical Field
The prior disclosed battery charge-discharge control method fully considers the influence of factors such as performance attenuation, balance and temperature of the battery on the charge-discharge of the battery, and does not consider the performance requirements of the whole vehicle and the performances of a motor and other electric accessories when the charge-discharge of the battery is controlled. If the requirements of electric equipment of electric accessories such as a finished automobile and a motor are not considered in the charging and discharging control, the performance of the finished automobile is influenced.
Disclosure of Invention
The invention aims to provide a new energy vehicle power battery charging and discharging control system and method, the influence of the performance of a battery and environmental factors on the battery, the performance requirement of a whole vehicle and the performance of electric equipment are taken into consideration in charging and discharging control factors, different types of influence factors are developed in a modularized mode, the influence of the influence factors on the charging and discharging of the power battery is analyzed in the module, and the correction influence factors of charging current are given, and meanwhile, the charging and discharging current of the power battery is corrected according to the control priority, so that more accurate control is achieved.
In order to achieve the purpose, the invention designs a new energy vehicle power battery charging and discharging control system, which is characterized in that: the device comprises a battery performance influence factor calculation module, a power battery use environment influence factor calculation module, a whole vehicle demand performance influence factor calculation module, an in-vehicle electric equipment influence factor calculation module and a power battery charging and discharging current correction module;
the battery performance influence factor calculation module is used for calculating influence factors of battery performance on charging and discharging currents, and the influence factors of the battery performance on the charging and discharging currents comprise power battery charging and discharging current correction factors corresponding to battery pack voltage, power battery charging and discharging current correction factors corresponding to battery pack temperature and power battery charging and discharging current correction factors corresponding to heat conducting materials of the battery pack;
the power battery use environment influence factor calculation module is used for calculating influence factors of a power battery use environment on charge and discharge currents, wherein the influence factors of the power battery use environment on the charge and discharge currents comprise power battery charge and discharge current correction factors corresponding to an environment temperature and power battery charge and discharge current correction factors corresponding to a battery arrangement mode;
the whole vehicle demand performance influence factor calculation module is used for calculating a power battery charging and discharging current correction factor corresponding to a driving mode;
the vehicle interior electric equipment influence factor calculation module is used for calculating a power battery charging and discharging current correction factor corresponding to the vehicle interior electric equipment;
the power battery charging and discharging current correction module is used for correcting the charging and discharging current of the power battery by utilizing the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery using environment on the charging and discharging current, the power battery charging and discharging current correction factor corresponding to the driving mode and the power battery charging and discharging current correction factor corresponding to the electric equipment in the vehicle.
The specific method for correcting the charging and discharging current of the power battery by the charging and discharging current correction module of the power battery by utilizing the influence factor of the battery performance on the charging and discharging current, the influence factor of the use environment of the power battery on the charging and discharging current, the charging and discharging current correction factor of the power battery corresponding to the driving mode and the charging and discharging current correction factor of the power battery corresponding to the electric equipment in the vehicle is as follows:
calculating the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery use environment on the charging and discharging current, the power battery charging and discharging current correction factor corresponding to the driving mode and the value of the power battery charging and discharging current correction factor corresponding to the electric equipment in the vehicle in real time, wherein in the first initial correction calculation, the corrected charging and discharging current of the power battery is the current charging and discharging current, the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery use environment on the charging and discharging current and the maximum three factors of the power battery charging and discharging current correction factors corresponding to the electric equipment in the vehicle are added in the subsequent calculation, then adding the current charging and discharging current to obtain the current corrected charging and discharging current of the power battery;
the value of the influence factor of the battery performance on the charging and discharging current is equal to a power battery charging and discharging current correction factor corresponding to the voltage of the battery pack, a power battery charging and discharging current correction factor corresponding to the temperature of the battery pack and a power battery charging and discharging current correction factor corresponding to the heat conducting material of the battery pack;
and the influence factor of the power battery use environment on the charging and discharging current is the power battery charging and discharging current correction factor corresponding to the environment temperature plus the power battery charging and discharging current correction factor corresponding to the battery arrangement mode.
The invention has the beneficial effects that:
1. the consideration factors of the charging and discharging current of the battery in the invention not only take the most important influence of the performance of the battery, but also consider the requirements of other factors on the battery, and not only prolong the service life of the battery to a certain extent, but also consider the performance of the whole vehicle.
2. The calculation of the charge and discharge influence factor is changed according to the state of the whole vehicle, so that the method is more suitable for the actual requirement of the whole vehicle, has the self-learning property, and more accurately controls the charge and discharge current.
3. The influence factors are controlled according to the modularization classification, and are easier to modify in subsequent development, so that the workload of repeated development is reduced.
Drawings
FIG. 1 is a block diagram of the present invention;
the device comprises a battery performance influence factor calculation module, a power battery use environment influence factor calculation module, a whole vehicle demand performance influence factor calculation module, an in-vehicle electric equipment influence factor calculation module and a power battery charge and discharge current correction module, wherein the battery performance influence factor calculation module, the power battery use environment influence factor calculation module, the whole vehicle demand performance influence factor calculation module, the in-vehicle electric equipment influence factor calculation module and the power battery charge and discharge current correction module are arranged in a vehicle.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the invention designs a new energy vehicle power battery charging and discharging control system, as shown in figure 1, which comprises a battery performance influence factor calculation module 1, a power battery use environment influence factor calculation module 2, a whole vehicle demand performance influence factor calculation module 3, an in-vehicle electric equipment influence factor calculation module 4 and a power battery charging and discharging current correction module 5;
the battery performance influence factor calculation module 1 is used for calculating influence factors [ A (N), B (N), C (N) ] of battery performance on charge and discharge current, wherein the influence factors of the battery performance on the charge and discharge current comprise a power battery charge and discharge current correction factor A (N) corresponding to battery pack voltage, a power battery charge and discharge current correction factor B (N) corresponding to battery pack temperature and a power battery charge and discharge current correction factor C (N) corresponding to a heat conducting material of the battery pack;
the power battery use environment influence factor calculation module 2 is used for calculating influence factors [ E (N), F (N) ] of the power battery use environment on the charge and discharge current, wherein the influence factors of the power battery use environment on the charge and discharge current comprise a power battery charge and discharge current correction factor E (N) corresponding to the environment temperature and a power battery charge and discharge current correction factor F (N) corresponding to the battery arrangement mode;
the whole vehicle demand performance influence factor calculation module 3 is used for calculating a power battery charging and discharging current correction factor [ H1, J1] corresponding to a driving mode;
the vehicle interior electric equipment influence factor calculation module 4 is used for calculating power battery charging and discharging current correction factors [ G1, K1, L1, M1 and N1] corresponding to the vehicle interior electric equipment;
the power battery charging and discharging current correction module 5 is used for correcting the charging and discharging current of the power battery by using the influence factors [ A (N), B (N) and C (N)) of the battery performance on the charging and discharging current, the influence factors [ E (N) and F (N)) of the power battery use environment on the charging and discharging current, the power battery charging and discharging current correction factors [ H1 and J1] corresponding to the driving mode and the power battery charging and discharging current correction factors [ G1, K1, L1, M1 and N1] corresponding to the electric equipment in the vehicle.
In the above technical solution, the method for calculating the power battery charging and discharging current correction factor a (n) corresponding to the battery pack voltage by the battery performance impact factor calculation module 1 includes:
calculating the voltage change a1 of the battery pack, wherein the voltage change a1 of the battery pack is the current voltage of the battery pack-the initial voltage recorded by the measurement of the battery pack;
calculating the voltage change rate a1 'of the battery pack, wherein the voltage change rate a 1' of the battery pack is (the current voltage of the battery pack-the initial voltage recorded by the battery pack measurement)/the initial voltage recorded by the battery pack measurement;
when the voltage of the battery pack is 10% > | a 1' | >0, the charging and discharging current correction factor a (n) of the power battery corresponding to the voltage of the battery pack is 0, that is, the battery pack has small voltage change in a detected unit time, the battery pack may be in trickle charge, and then the current charging current is corrected to be 0 and is not corrected;
when the voltage of the battery pack is 30% > | a1 '| > 10%, the power battery charging and discharging current correction factor a (n) corresponding to the voltage of the battery pack is 0.3 × a 1'. the current power battery charging current i, namely the voltage of the battery pack does not change greatly in a unit time of detection, and the correction on the current charging current is small when a large-current charging stage is performed;
when 50% > | a1 '| > 30%, the power battery charging and discharging current correction factor a (n) corresponding to the battery pack voltage is 0.5 × a 1' × the current charging current i, that is, the battery pack has a large voltage change and a large correction on the current charging current in a detected unit time;
when | a1 '| > 50%, the power battery charging and discharging current correction factor a (n) ═ a 1'. current power battery charging current i corresponding to the battery pack voltage.
In the above technical solution, the method for calculating the power battery charging and discharging current correction factor b (n) corresponding to the battery pack temperature by the battery performance impact factor calculation module 1 is as follows:
calculating battery pack temperature rise b1, wherein the battery pack temperature rise b1 is battery pack temperature-initial temperature recorded by battery pack detection;
calculating a battery pack temperature increase speed b1 'for one detection period, b 1' ═ d (b1)/dt for one detection period, t representing time, i.e., the integral of the change in the battery over time during one detection period;
when the charging current of the power battery is 10% > | b 1' | >0, the charging and discharging current correction factor b (n) corresponding to the temperature of the battery pack is 0, that is, the temperature change of the battery pack in a detected unit time is small, the charging and discharging requirements of the battery pack are not large, or the heat dissipation effect is very good, then the current charging current is corrected to be 0, and the correction is not carried out;
when the charging and discharging current of the power battery is 30% > | b1 '| > 10%, the charging and discharging current correction factor b (n) of the power battery corresponding to the temperature of the battery pack is 0.3 ″, namely the temperature rise b 1' of the battery pack is not large, namely the temperature change of the battery pack in a unit time of detection is not large, and the influence of the temperature on the charging and discharging of the battery is considered to be small, so that the correction on the current charging current is small;
when the charging current of the power battery is 40% > | b1 '| > 30%, the charging and discharging current correction factor b (n) of the power battery corresponding to the temperature of the battery pack is 0.5 ″) and the temperature rise b 1' of the battery pack is the current charging current i of the power battery, namely the temperature rise of the battery pack is greatly changed in a detected unit time, and the charging current needs to be corrected within a certain range;
when | b1 '| > 40%, the power battery charging/discharging current correction factor b (n) ═ b 1' > corresponding to the battery pack temperature is the current power battery charging current i, that is, the battery pack has a large temperature change in a unit time of detection, and it is considered that the current battery pack temperature change has a large influence on the charging/discharging of the battery, and the current charging current needs to be corrected.
In the above technical solution, the method for calculating the power battery charge-discharge current correction factor c (n) corresponding to the thermal conductive material of the battery pack by the battery performance impact factor calculation module 1 is as follows;
calculating the heat Q transferred by the heat conduction plate of the battery pack in a heat conduction mode in unit time;
Q＝λ*A*(t1-t2)/ξ
wherein, λ is the heat conductivity coefficient of the material of the heat conducting plate; a is the heat conducting area of the contact between the battery pack and the heat conducting plate; (t1-t2) is the temperature difference between the battery pack and the thermally conductive plate; xi is the thickness of the heat conducting plate, if the heat quantity taken away by the heat conducting plate is in direct proportion to the temperature rise of the battery, the taken away heat quantity is in direct proportion to the generated heat quantity in unit time, and if the heat quantity taken away by the heat conducting plate is not in direct proportion to the temperature rise of the battery or the difference is large, the temperature change possibly caused by charging and discharging in unit time is fast;
when the absolute value of Q1/Q2-absolute value of b1 is less than 0.1, the charging and discharging current correction factor C (N) of the power battery corresponding to the heat conducting material of the battery pack is 0;
when the charging current of the power battery is 0.1< | Q1/Q2| - | b1| <0.15, the charging and discharging current correction factor C (N) (| Q1/Q2| - | b1|) corresponding to the heat conducting material of the battery pack is the current charging current i of the power battery;
when | Q1/Q2| - | b1| >0.15, the power battery charging and discharging current correction factor c (n) corresponding to the heat conducting material of the battery pack is-0.5 | the current power battery charging current i |;
wherein, Q1 and Q2 are the heat quantity transferred by the heat conducting plate in a heat conduction mode in two adjacent unit sampling time, and b1 is the temperature rise of the battery pack.
In the above technical solution, the specific method for calculating the power battery charging and discharging current correction factor e (n) corresponding to the ambient temperature by using the ambient influence factor calculation module 2 is as follows:
when | e1-e2|/b1>2, the influence of the ambient temperature on the temperature of the battery pack is not large, and the charge and discharge current correction factor E (N) of the power battery corresponding to the ambient temperature is 0;
when 1< (| e1-e2|/b1) <2, the temperature of the battery pack changes greatly when the ambient temperature changes, and a power battery charging and discharging current correction factor E (N) (| e1-e2|/b1) corresponding to the ambient temperature corresponds to the current power battery charging current i;
when (| e1-e2|/b1) <1, the power battery charging and discharging current correction factor e (n) (| e1-e2|/b1) corresponding to the ambient temperature is the current power battery charging current i, and at the moment, when the ambient temperature changes, the temperature of a battery pack also changes greatly, and except for the influence of the environment, the battery can be charged and discharged at a large current;
wherein e1 and e2 are the ambient temperatures in two adjacent unit sampling time, and b1 is the battery pack temperature rise.
In the above technical solution, the specific method for calculating the power battery charging and discharging current correction factor f (n) corresponding to the battery arrangement manner by using the environmental impact factor calculation module 2 for the power battery is as follows:
when | ∑ 1/| - | b1| <0.1, the charging and discharging current correction factor f (n) of the power battery corresponding to the battery arrangement mode is 0;
when the charging current of the power battery is 0.1< | sigma 1/sigma 2| - | b1| <0.15, the charging and discharging current correction factor F (N) (| sigma 1/sigma 2| - | b1|) of the power battery corresponding to the battery arrangement mode is the current charging current i of the power battery;
when | ∑ 1/Σ 2| - | b1| >0.15, the power battery charging and discharging current correction factor f (n) corresponding to the battery arrangement mode is-0.5 | the current power battery charging current i |;
sigma 1 and sigma 2 are heat quantity taken away by each group of batteries in two adjacent unit sampling time, and b1 is temperature rise of the battery pack.
In the above technical solution, the specific method for calculating the power battery charging and discharging current correction factor [ H1, J1] corresponding to the driving mode by the vehicle demand performance influence factor calculation module 3 is as follows:
when the motion mode of the whole vehicle is a motion mode or a snow mode, the whole vehicle is considered to have large requirement on torque and large energy consumption;
calculating integral vehicle energy consumption ═ integral vehicle power battery discharge current I in detection period1dt；
Calculating the charging current Idt of the power battery, namely ═ power battery charging energy in the detection period;
comparing the energy consumption difference of the whole vehicle and the battery charging energy with the current energy ratio of the battery in unit time, if (| | [ integral ] power battery discharging current I1dt ^ current power battery charging current Idt |)/| current energy of battery<15%, and power battery charging and discharging current correction factors [ H1, J1] corresponding to driving modes]＝0；
If (| integral | [ factor ] power battery discharge current I1dt ^ current power battery charging current Idt |)/| current energy of battery>15%, and power battery charging and discharging current correction factors [ H1, J1] corresponding to driving modes](| |. j | power battery discharge current I)1dt- > current power battery charging current Idt |)/| current battery energy |. current power battery charging current i;
when the vehicle motion mode is a common mode, the vehicle is considered to be normal to the torque, and the charging and discharging current correction factor [ H1, J1] of the power battery corresponding to the driving mode is 0.
In the above technical solution, the specific calculation method for calculating the power battery charging and discharging current correction factors [ G1, K1, L1, M1, N1] corresponding to the in-vehicle electric devices by the in-vehicle electric device influence factor calculation module 4 is as follows:
if (| integral multiple motor bus current I)2dt + integral factor of air conditioner input current I3dt |)/current capacity of battery<10 percent of power battery charging and discharging current correction factors corresponding to the electric equipment in the vehicle [ G1, K1, L1, M1 and N1]]＝0；
If 10 percent<(| integral multiple motor bus current I2dt + integral factor of air conditioner input current I3dt |)/current capacity of battery<50 percent of power battery charging and discharging current correction factors corresponding to the electric equipment in the vehicle [ G1, K1, L1, M1 and N1]]Bus current I of | (j integral multiple motor)2dt + integral factor of air conditioner input current I3dt |)/current battery charge amount vs current power battery charging current i;
if (| integral multiple motor bus current I)2dt + integral factor of air conditioner input current I3dt |)/current capacity of battery>50 percent of power battery charging and discharging current correction factors corresponding to the electric equipment in the vehicle [ G1, K1, L1, M1 and N1]]═ integral (j) motor bus current I2dt + integral factor of air conditioner input current I3dt |)/current battery charge amount current power battery charging current i | 2.
In the above technical solution, the specific method for the power battery charging and discharging current correction module 5 to correct the charging and discharging current of the power battery by using the influence factors [ a (N), b (N), c (N) ] of the battery performance on the charging and discharging current, the influence factors [ e (N), f (N) ] of the power battery usage environment on the charging and discharging current, the power battery charging and discharging current correction factors [ H1, J1] corresponding to the driving mode, and the power battery charging and discharging current correction factors [ G1, K1, L1, M1, N1] corresponding to the power consumption device in the vehicle includes:
calculating influence factors [ A (N), B (N), C (N) ], influence factors [ E (N), F (N) ], influence factors [ H1, J1] of power battery use environment on charge and discharge current, values of power battery charge and discharge current correction factors [ G1, K1, L1, M1, N1] corresponding to a driving mode in real time, wherein in the first initial correction calculation, the power battery charge and discharge current after correction is the current charge and discharge current plus influence factors [ A (N), B (N), C (N) ], influence factors [ E (N) of power battery use environment on charge and discharge current, F (N) ], and influence factors [ H1, J1] corresponding to the driving mode, and influence factors [ A (N), N) of battery performance on charge and discharge current in the subsequent calculation, b (N), C (N)), influence factors [ E (N), F (N)) of the use environment of the power battery on the charging and discharging current, power battery charging and discharging current correction factors [ H1, J1] corresponding to the driving mode and power battery charging and discharging current correction factors [ G1, K1, L1, M1 and N1] corresponding to the electric equipment in the vehicle are added (namely the minimum factor is deleted), and then the current charging and discharging current is added to obtain the current corrected charging and discharging current of the power battery;
the values of the influence factors [ A (N), B (N) and C (N) of the battery performance on the charging and discharging current are power battery charging and discharging current correction factors A (N) corresponding to the voltage of the battery pack and power battery charging and discharging current correction factors B (N) corresponding to the temperature of the battery pack and power battery charging and discharging current correction factors C (N) corresponding to the heat conducting material of the battery pack;
the influence factor [ e (n), f (n)) ] of the power battery using environment on the charging and discharging current is equal to the power battery charging and discharging current correction factor E (n)) + the power battery charging and discharging current correction factor f (n) corresponding to the mode of arranging the batteries corresponding to the environment temperature.
A new energy vehicle power battery charge-discharge control system comprises the following steps:
step 1: calculating influence factors [ A (N), B (N), C (N) ] of the battery performance on the charge and discharge current, wherein the influence factors of the battery performance on the charge and discharge current comprise a power battery charge and discharge current correction factor A (N) corresponding to the voltage of the battery pack, a power battery charge and discharge current correction factor B (N) corresponding to the temperature of the battery pack and a power battery charge and discharge current correction factor C (N) corresponding to a heat conducting material of the battery pack;
calculating influence factors [ E (N), F (N) of the power battery use environment on the charge and discharge current, wherein the influence factors of the power battery use environment on the charge and discharge current comprise power battery charge and discharge current correction factors E (N) corresponding to the environment temperature and power battery charge and discharge current correction factors F (N) corresponding to the battery arrangement mode;
calculating a power battery charging and discharging current correction factor [ H1, J1] corresponding to the driving mode;
calculating power battery charging and discharging current correction factors [ G1, K1, L1, M1 and N1] corresponding to electric equipment in the vehicle;
step 2: correcting the charging and discharging current of the power battery by using the influence factors [ A (N), B (N), C (N) ] of the battery performance on the charging and discharging current, the influence factors [ E (N), F (N) ] of the use environment of the power battery on the charging and discharging current, the correction factors [ H1, J1] of the power battery corresponding to the driving mode and the correction factors [ G1, K1, L1, M1 and N1] of the power battery corresponding to the electric equipment in the vehicle;
in the first initial correction calculation, the corrected power battery charging and discharging current is equal to the current charging and discharging current plus the influence factor of the battery performance on the charging and discharging current [ A (N), B (N), C (N)) ] plus the influence factor of the power battery use environment on the charging and discharging current [ E (N), F (N)) ] plus the power battery charging and discharging current correction factor corresponding to the driving mode [ H1, J1], and in the subsequent calculation, the influence factors of the battery performance on the charging and discharging current [ A (N), B (N), C (N)) ] and the influence factor of the power battery use environment on the charging and discharging current [ E (N), F (N)) ] and the power battery charging and discharging current correction factors corresponding to the driving mode [ H1, J1] and the power battery charging and discharging current correction factors corresponding to the in-vehicle electric equipment [ G1, K1, L1, M1, N1] are added, and then adding the current charging and discharging current to obtain the current corrected charging and discharging current of the power battery.
In the first calculation, the four modules are given priority levels according to the priority levels, which are respectively as follows: the device comprises a battery performance influence factor calculation module 1, a power battery use environment influence factor calculation module 2, a whole vehicle demand performance influence factor calculation module 3 and an in-vehicle electric equipment influence factor calculation module 4. The calculation is performed first with a high priority, and only the influence factors of the three modules are calculated to correct the charging and discharging currents of the battery (i.e., the power battery charging and discharging current correction factors [ G1, K1, L1, M1, N1] corresponding to the in-vehicle electric devices calculated by the in-vehicle electric device influence factor calculation module 4 are not initially calculated), so that the control efficiency is reduced and the calculation is not necessary. With the change of the state of the whole vehicle, the priorities of the four modes are reordered, for example, when the vehicle is statically charged, the priority of the whole vehicle demand performance module is the lowest, because the influence of the mode of the vehicle on the battery can be ignored. However, the charging and discharging current of the battery has an upper and lower threshold value (from 0 to the maximum charging and discharging current of the battery) at the end.
When the whole vehicle is in operation, the priority of the four modules is determined according to the following principle:
1. and adding the influence factors of the same influence module to obtain the influence factor value of one influence module under the current vehicle state, wherein the influence factor value has the largest value and is the influence module with the highest priority, and the influence factor value has the smallest value and is the influence module with the lowest priority, and the influence is ignored.
2. Since the vehicle state is constantly changing, the determination of the priority is a dynamic process (the priority for correction calculation is determined in real time according to the sequence of factors from large to small).
3. The charge and discharge are corrected to follow a threshold of upper and lower limits (0 to the maximum charge and discharge current of the battery).
Example 1:
1. when the vehicle enters a motion mode, the torque required by the whole vehicle is large, the maximum output torque of the engine cannot meet the requirement, the battery is required to provide more electric quantity for the motor, the torque of the whole vehicle is supplemented to be insufficient, and at the moment, priority ranking is obtained:
setting a power battery charging and discharging current correction factor [ H1, J1] corresponding to the driving mode at priority 1;
2. in autumn, the environmental temperature is 2 ℃, and the influence factors [ E (N), F (N) ] of the power battery use environment on the charge and discharge current are set at the priority level of 2;
3. in the daytime, the road condition is good, the vehicle lamp is not started, the air conditioner is not started, only the blowing is used, and the power battery charging and discharging current correction factors [ G1, K1, L1, M1 and N1] corresponding to the electric equipment in the vehicle are ignored;
4. the battery is new, the temperature of the battery body is gradually increased at 5 ℃ due to the driving of the vehicle, and the influence factors [ A (N), B (N), C (N) ] of the battery performance on the charge and discharge current are set at the priority 3;
at this time, when the battery discharge control is performed, the priorities 1, 2 and 3 are considered, the influence factor of the electric equipment in the vehicle is ignored, and at this time, the influence on the battery discharge current is corrected to be:
the corrected power battery charge and discharge current is the current charge and discharge current + [ H1, J1] + [ e (n), f (n) + [ a (n), b (n), c (n) ].
Example 2:
1. when the vehicle advances at the speed of 60km/h, the air conditioner turns off all the lamps. At this time, according to the obtained values, priority ranking is carried out:
2. the charging and discharging current correction factors [ H1, J1] of the power battery corresponding to the driving mode are not placed at the priority level 1 any more, but are arranged at the fourth position and are ignored;
3. when the temperature of the battery rises to 40 ℃, the priority of the influence factors (A (N), B (N) and C (N)) of the battery performance on the charge and discharge current is improved to 1;
4. the priority of the influence factors [ E (N) and F (N) of the power battery use environment on the charge and discharge current is 2;
5. the charging and discharging current correction factors [ G1, K1, L1, M1 and N1] of the power batteries corresponding to the electric equipment in the vehicle are priority 3, and the discharging factors of the batteries are corrected:
the corrected charge and discharge current of the power battery is equal to the current charge and discharge current + [ A (N), B (N), C (N)) ] + [ E (N), F (N)) ] + [ G1, K1, L1, M1 and N1 ].
From the above two examples, the change of the vehicle state also causes the change of the priority of the correction module, wherein the temperature rise, the temperature rise speed and the ambient temperature of the battery are changed, the table look-up of the correction factor is also changed, but the material, the arrangement mode and the heat dissipation mode of the battery are not changed.
The battery charge-discharge control method of the invention takes the performance of the battery, the requirement of the whole vehicle and the performance of the electric equipment into overall consideration. The performance of each influence on the charging and discharging of the power battery is controlled in a modularized mode, namely, each type of influence factor is summarized into one control module, and the control module is convenient to re-develop in the later period. And sequencing the control priorities of the modules influencing the charge and discharge performance of the power battery, and also sequencing the influence of the variables influencing the charge and discharge of the power battery in the modularization in priority. In each module, a value is assigned to a variable influencing the charging and discharging performance of the battery, namely an influencing factor influencing the charging and discharging, and the charging and discharging current is corrected by the influencing factor. And more accurate control of charging and discharging of the power battery is realized.
The invention considers the influence of the battery performance and environmental factors on the battery, the performance requirement of the whole vehicle and the performance of electric equipment on the charging and discharging control factors, modularizes and develops different types of influence factors, analyzes the influence of the influence factors on the charging and discharging of the power battery in a module, endows the influence factors with the charging current to be corrected, and corrects the charging and discharging current of the power battery according to the control priority, thereby achieving more accurate control.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Claims (9)

1. The utility model provides a new forms of energy car power battery control system that charges and discharges which characterized in that: the device comprises a battery performance influence factor calculation module (1), a power battery use environment influence factor calculation module (2), a whole vehicle demand performance influence factor calculation module (3), an in-vehicle electric equipment influence factor calculation module (4) and a power battery charging and discharging current correction module (5);
the battery performance influence factor calculation module (1) is used for calculating influence factors of battery performance on charge and discharge currents, wherein the influence factors of the battery performance on the charge and discharge currents comprise power battery charge and discharge current correction factors corresponding to battery pack voltage, power battery charge and discharge current correction factors corresponding to battery pack temperature and power battery charge and discharge current correction factors corresponding to heat conducting materials of the battery pack;
the power battery use environment influence factor calculation module (2) is used for calculating influence factors of a power battery use environment on charge and discharge currents, wherein the influence factors of the power battery use environment on the charge and discharge currents comprise power battery charge and discharge current correction factors corresponding to an environment temperature and power battery charge and discharge current correction factors corresponding to a battery arrangement mode;
the whole vehicle demand performance influence factor calculation module (3) is used for calculating a power battery charging and discharging current correction factor corresponding to a driving mode;
the in-vehicle electric equipment influence factor calculation module (4) is used for calculating a power battery charging and discharging current correction factor corresponding to in-vehicle electric equipment;
the power battery charging and discharging current correction module (5) is used for correcting the charging and discharging current of the power battery by utilizing the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery using environment on the charging and discharging current, the power battery charging and discharging current correction factor corresponding to the driving mode and the power battery charging and discharging current correction factor corresponding to the electric equipment in the vehicle;
the method for calculating the power battery charging and discharging current correction factor corresponding to the battery pack voltage by the battery performance influence factor calculation module (1) comprises the following steps:
calculating the voltage change a1 of the battery pack, wherein the voltage change a1 of the battery pack is the current voltage of the battery pack-the initial voltage recorded by the measurement of the battery pack;
calculating the voltage change rate a1 'of the battery pack, wherein the voltage change rate a 1' of the battery pack is (the current voltage of the battery pack-the initial voltage recorded by the battery pack measurement)/the initial voltage recorded by the battery pack measurement;
when the voltage is 10% > | a 1' | >0, the power battery charging and discharging current correction factor corresponding to the battery pack voltage is 0;
when the voltage of the battery pack is 30% > | a1 '| > 10%, the power battery charging and discharging current correction factor corresponding to the voltage of the battery pack is 0.3 a 1'. the current power battery charging current i;
when the voltage of the battery pack is 50% > | a1 '| > 30%, the charging and discharging current correction factor of the power battery corresponding to the voltage of the battery pack is 0.5 a 1'. the current charging current i;
when | a1 '| > 50%, the power battery charging and discharging current correction factor corresponding to the battery pack voltage is a 1'. current power battery charging current i.
2. The new energy vehicle power battery charging and discharging control system according to claim 1, characterized in that: the method for calculating the power battery charging and discharging current correction factor corresponding to the battery pack temperature by the battery performance influence factor calculation module (1) comprises the following steps:
calculating battery pack temperature rise b1, wherein the battery pack temperature rise b1 is battery pack temperature-initial temperature recorded by battery pack detection;
calculating a battery pack temperature increase speed b1 'for one detection period, b 1' ═ d (b1)/dt, t represents time;
when the voltage is 10% > | b 1' | >0, the power battery charging and discharging current correction factor corresponding to the battery pack temperature is 0;
when the charging and discharging current of the power battery is 30% > | b1 '| > 10%, the charging and discharging current correction factor of the power battery corresponding to the temperature of the battery pack is 0.3 ═ the temperature rise b 1' of the battery pack and the current charging current i of the power battery;
when the charging and discharging current of the power battery is 40% > | b1 '| > 30%, the charging and discharging current correction factor of the power battery corresponding to the temperature of the battery pack is 0.5 ═ the temperature rise b 1' of the battery pack and the current charging current i of the power battery;
when | b1 '| > 40%, the power battery charging and discharging current correction factor corresponding to the battery pack temperature is b 1'. current power battery charging current i.
3. The new energy vehicle power battery charging and discharging control system according to claim 1, characterized in that: the method for calculating the power battery charging and discharging current correction factor corresponding to the heat conducting material of the battery pack by the battery performance influence factor calculation module (1) is as follows;
calculating the heat Q transferred by the heat conduction plate of the battery pack in a heat conduction mode in unit time;
Q＝λ*A*(t1-t2)/ξ
wherein, λ is the heat conductivity coefficient of the material of the heat conducting plate; a is the heat conducting area of the contact between the battery pack and the heat conducting plate; (t1-t2) is the temperature difference between the battery pack and the thermally conductive plate; xi is the thickness of the heat conducting plate;
when the absolute value of Q1/Q2-absolute value of b1 is less than 0.1, the charging and discharging current correction factor of the power battery corresponding to the heat conducting material of the battery pack is 0;
when the charging current of the power battery is 0.1< | Q1/Q2| - | b1| <0.15, the charging and discharging current correction factor of the power battery corresponding to the heat conducting material of the battery pack (| Q1/Q2| - | b1|) is the current charging current i of the power battery;
when the absolute value of Q1/Q2 is-b 1 is greater than 0.15, the power battery charging and discharging current correction factor corresponding to the heat conducting material of the battery pack is-0.5, and the current power battery charging current i is greater than the absolute value of the current power battery charging current i;
wherein, Q1 and Q2 are the heat quantity transferred by the heat conducting plate in a heat conduction mode in two adjacent unit sampling time, and b1 is the temperature rise of the battery pack.
4. The new energy vehicle power battery charging and discharging control system according to claim 1, characterized in that: the specific method for calculating the power battery charging and discharging current correction factor corresponding to the environmental temperature by the power battery use environment influence factor calculation module (2) is as follows:
when | e1-e2|/b1>2, the power battery charging and discharging current correction factor corresponding to the ambient temperature is 0;
when 1< (| e1-e2|/b1) <2, the power battery charging and discharging current correction factor corresponding to the ambient temperature is (| e1-e2|/b1) the current power battery charging current i;
when (| e1-e2|/b1) <1, the power battery charging and discharging current correction factor corresponding to the ambient temperature is (1- | e1-e2|/b1) × the current power battery charging current i;
wherein e1 and e2 are the ambient temperatures in two adjacent unit sampling time, and b1 is the battery pack temperature rise.
5. The new energy vehicle power battery charging and discharging control system according to claim 1, characterized in that:
the specific method for calculating the power battery charging and discharging current correction factor corresponding to the battery arrangement mode by using the power battery environment influence factor calculation module (2) is as follows:
when | ∑ 1/| - | b1| <0.1, the charging and discharging current correction factor of the power battery corresponding to the battery arrangement mode is equal to 0;
when the charging current of the power battery is 0.1< | sigma 1/sigma 2| - | b1| <0.15, the charging and discharging current correction factor of the power battery corresponding to the battery arrangement mode is (| sigma 1/sigma 2| - | b1|) > current charging current i of the power battery;
when | ∑ 1/Σ 2| - | b1| >0.15, the power battery charging and discharging current correction factor corresponding to the battery arrangement mode is-0.5 | the current power battery charging current i |;
sigma 1 and sigma 2 are heat quantity taken away by each group of batteries in two adjacent unit sampling time, and b1 is temperature rise of the battery pack.
6. The new energy vehicle power battery charging and discharging control system according to claim 1, characterized in that: the specific method for calculating the power battery charging and discharging current correction factor corresponding to the driving mode by the whole vehicle demand performance influence factor calculation module (3) is as follows:
when the whole vehicle motion mode is a motion mode or a snow mode;
calculating integral vehicle energy consumption ═ integral vehicle power battery discharge current I in detection period1dt；
Calculating the charging current Idt of the power battery, namely ═ power battery charging energy in the detection period;
if (| integral | [ factor ] power battery discharge current I1dt ^ current power battery charging current Idt |)/| current energy of battery<15%, the charging and discharging current correction factor of the power battery corresponding to the driving mode is equal to 0;
if (| integral | [ factor ] power battery discharge current I1dt ^ current power battery charging current Idt |)/| current energy of battery>15%, and power battery charging and discharging current correction factors [ H1, J1] corresponding to driving modes](| |. j | power battery discharge current I)1dt- > current power battery charging current Idt |)/| current battery energy |. current power battery charging current i;
when the whole vehicle motion mode is a common mode, the whole vehicle needs normal torque, and the charging and discharging current correction factor of the power battery corresponding to the driving mode is 0.
7. The new energy vehicle power battery charging and discharging control system according to claim 1, characterized in that: the specific calculation method for calculating the power battery charging and discharging current correction factor corresponding to the in-vehicle electric equipment by the in-vehicle electric equipment influence factor calculation module (4) is as follows:
if (| integral multiple motor bus current I)2dt + integral factor of air conditioner input current I3dt |)/current capacity of battery<10%, the charging and discharging current correction factor of the power battery corresponding to the electric equipment in the vehicle is 0;
if 10 percent<(| integral multiple motor bus current I2dt + integral factor of air conditioner input current I3dt |)/current capacity of battery<50 percent, and a power battery charging and discharging current correction factor corresponding to the electric equipment in the vehicle (| | | n | motor bus current I)2dt + integral factor of air conditioner input current I3dt |)/current battery charge amount vs current power battery charging current i;
if (| integral multiple motor bus current I)2dt + integral factor of air conditioner input current I3dt |)/current capacity of battery>50 percent, and the corresponding power battery charging and discharging current correction factor ═ ^ integral (integral motor bus current I) of the electrical equipment in the vehicle2dt + integral factor of air conditioner input current I3dt |)/current battery charge amount current power battery charging current i | 2.
8. The new energy vehicle power battery charging and discharging control system according to claim 1, characterized in that: the specific method for correcting the charging and discharging current of the power battery by the charging and discharging current correction module (5) by utilizing the influence factor of the battery performance on the charging and discharging current, the influence factor of the service environment of the power battery on the charging and discharging current, the charging and discharging current correction factor of the power battery corresponding to the driving mode and the charging and discharging current correction factor of the power battery corresponding to the electric equipment in the vehicle is as follows:
calculating the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery use environment on the charging and discharging current, the power battery charging and discharging current correction factor corresponding to the driving mode and the value of the power battery charging and discharging current correction factor corresponding to the electric equipment in the vehicle in real time, wherein in the first initial correction calculation, the corrected charging and discharging current of the power battery is the current charging and discharging current, the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery use environment on the charging and discharging current and the maximum three factors of the power battery charging and discharging current correction factors corresponding to the electric equipment in the vehicle are added in the subsequent calculation, then adding the current charging and discharging current to obtain the current corrected charging and discharging current of the power battery;
the value of the influence factor of the battery performance on the charging and discharging current is equal to a power battery charging and discharging current correction factor corresponding to the voltage of the battery pack, a power battery charging and discharging current correction factor corresponding to the temperature of the battery pack and a power battery charging and discharging current correction factor corresponding to the heat conducting material of the battery pack;
and the influence factor of the power battery use environment on the charging and discharging current is the power battery charging and discharging current correction factor corresponding to the environment temperature plus the power battery charging and discharging current correction factor corresponding to the battery arrangement mode.
9. The charge and discharge control method of the new energy vehicle power battery charge and discharge control system is characterized by comprising the following steps:
step 1: calculating influence factors of battery performance on charge and discharge current, wherein the influence factors of the battery performance on the charge and discharge current comprise power battery charge and discharge current correction factors corresponding to battery pack voltage, power battery charge and discharge current correction factors corresponding to battery pack temperature and power battery charge and discharge current correction factors corresponding to heat conducting materials of the battery pack;
calculating influence factors of the power battery use environment on the charge and discharge current, wherein the influence factors of the power battery use environment on the charge and discharge current comprise power battery charge and discharge current correction factors corresponding to the environment temperature and power battery charge and discharge current correction factors corresponding to the battery arrangement mode;
calculating a power battery charging and discharging current correction factor corresponding to the driving mode;
calculating a power battery charging and discharging current correction factor corresponding to the electric equipment in the vehicle;
step 2: correcting the charging and discharging current of the power battery by using the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery using environment on the charging and discharging current, the charging and discharging current correction factor of the power battery corresponding to the driving mode and the charging and discharging current correction factor of the power battery corresponding to the electric equipment in the vehicle;
during the first initial correction calculation, the corrected power battery charging and discharging current is the current charging and discharging current, the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery use environment on the charging and discharging current and the power battery charging and discharging current correction factor corresponding to the driving mode, the influence factor of the battery performance on the charging and discharging current, the influence factor of the power battery use environment on the charging and discharging current, the power battery charging and discharging current correction factor corresponding to the driving mode and the power battery charging and discharging current correction factor corresponding to the in-vehicle electric equipment are added in the calculation, and then the current charging and discharging current is added to obtain the current corrected power battery charging and discharging current.
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