CN116512988A - Electric vehicle battery pack charging control circuit with temperature compensation function - Google Patents

Electric vehicle battery pack charging control circuit with temperature compensation function Download PDF

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Publication number
CN116512988A
CN116512988A CN202310351066.4A CN202310351066A CN116512988A CN 116512988 A CN116512988 A CN 116512988A CN 202310351066 A CN202310351066 A CN 202310351066A CN 116512988 A CN116512988 A CN 116512988A
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CN
China
Prior art keywords
circuit
voltage
resistor
control circuit
current
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Pending
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CN202310351066.4A
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Chinese (zh)
Inventor
覃成恒
彭志辉
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Wenzhou University
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Wenzhou University
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Priority to CN202310351066.4A priority Critical patent/CN116512988A/en
Publication of CN116512988A publication Critical patent/CN116512988A/en
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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
    • B60L58/18—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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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]
    • B60L58/13—Maintaining the SoC within a determined range
    • 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]
    • B60L58/15—Preventing overcharging
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • 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)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a battery pack charging control circuit of an electric vehicle with temperature compensation, which comprises a starting circuit, a charging control circuit and a current bypass circuit; the starting circuit is connected with the anode and the cathode of the lithium battery; the starting circuit is respectively connected with the charging control circuit and the current bypass, and the charging control circuit and the current bypass are also respectively connected with the cathode of the lithium battery; the output end of the charging control circuit is connected with the current bypass circuit; the charging control circuit comprises a sampling circuit, a difference solving circuit and a compensation circuit; the sampling circuit is used for collecting the voltage of the battery and controlling the maximum charging voltage change of the battery according to the temperature change; the difference solving circuit compares the sampling voltage with the built-in voltage so as to control the conduction degree of the difference solving circuit; the output end of the difference solving circuit is connected with the compensation circuit. The invention can realize the charge balance of the lithium battery at different temperatures, effectively prolong the service life of the battery, and has the advantages of simple structure, good practicability and the like.

Description

Electric vehicle battery pack charging control circuit with temperature compensation function
Technical Field
The invention relates to the technical field of battery charging, in particular to a battery pack charging control circuit with temperature compensation for an electric vehicle.
Background
With the progress of electric automobile technology, the number of electric automobiles is increasing, and the safety performance of the electric automobiles is becoming more and more interesting, especially the problem of battery charging safety. In order to improve output power and output voltage, the prior electric vehicle adopts the scheme that a plurality of single batteries are connected in series to form a battery pack, and then the plurality of battery packs are connected in parallel to further improve the output power and the output voltage. However, due to the differences among individual batteries, partial battery voltage is too high and is in an overcharged state when the batteries are charged. While the other part is low in voltage and in an unfilled state. If not handled in time, the battery pack can have accidents such as bulge, liquid leakage and even explosion. Meanwhile, the battery charging process is greatly affected by temperature, and the influence of the temperature on the charging parameters and performance needs to be considered during high-temperature charging, so that the battery charging control circuit must have a temperature compensation function.
Disclosure of Invention
The invention aims to provide an electric vehicle battery pack charging control circuit with temperature compensation. The invention can realize the charge balance of the lithium battery at different temperatures, effectively prolong the service life of the battery, and has the advantages of simple structure, good practicability and the like.
The technical scheme of the invention is as follows: a battery pack charging control circuit of an electric vehicle with temperature compensation comprises a starting circuit, a charging control circuit and a current bypass circuit; the starting circuit is connected with the anode and the cathode of the lithium battery; the starting circuit is respectively connected with the charging control circuit and the current bypass, and the charging control circuit and the current bypass are also respectively connected with the cathode of the lithium battery; the output end of the charging control circuit is connected with the current bypass circuit; the charging control circuit comprises a sampling circuit, a difference solving circuit and a compensation circuit; the sampling circuit is used for collecting the voltage of the battery and controlling the maximum charging voltage change of the battery according to the temperature change; the difference solving circuit compares the sampling voltage with the built-in voltage so as to control the conduction degree of the difference solving circuit; the output end of the difference solving circuit is connected with the compensation circuit, and the compensation circuit outputs a control quantity according to the conduction degree of the difference solving circuit; the voltage-to-current circuit converts the control quantity into control current; the current bypass circuit adjusts the charging current of the lithium battery according to the control current, and realizes battery charging adjustment.
The above-mentioned electric motor car group battery charge control circuit that possesses temperature compensation, the stated starting circuit includes PNP tube Q1, resistance R1 and zener diode Z1; the emitter of the PNP tube Q1 is connected with the positive electrode of the lithium battery, the base electrode of the NPN tube Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the cathode of a zener diode Z1, and the anode of the zener diode Z1 is connected with the negative electrode of the lithium battery; and the collector electrode of the PNP tube is connected with the charging control circuit and the current bypass.
The electric vehicle battery pack charging control circuit with temperature compensation comprises a resistor R2 and a positive temperature coefficient thermistor R3; one end of the resistor R2 is connected with the collector of the PNP tube Q1, the other end of the resistor R2 is connected with the positive temperature coefficient thermistor R3, and the other end of the positive temperature coefficient thermistor R3 is connected with the negative electrode of the lithium battery.
The foregoing electric vehicle battery pack charge control circuit with temperature compensation, the difference determining circuit includes a controllable precision voltage stabilizing source TL431 and a resistor R5; the cathode of the controllable precise voltage stabilizing source TL431 is connected with one end of a resistor R5 and a compensation circuit, and the other end of the resistor R5 is connected with the collector of a PNP tube Q1; the anode of the controllable precise voltage stabilizing source TL431 is connected with the cathode of the lithium battery, and the input end of the controllable precise voltage stabilizing source TL431 is connected between the resistor R2 and the positive temperature coefficient thermistor R3.
The electric vehicle battery pack charging control circuit with temperature compensation comprises a resistor R4 and a capacitor C1; one end of the resistor R4 is connected between the resistor R2 and the positive temperature coefficient thermistor R3, the other end of the resistor R4 is connected with one end of the capacitor C11, and the other end of the capacitor C11 is connected between the cathode of the controllable precise voltage stabilizing source TL431 and the resistor R5.
The electric vehicle battery pack charging control circuit with temperature compensation, wherein the current bypass circuit consists of a voltage control current source; the positive voltage electrode and the positive current electrode of the voltage control current source are connected with the collector electrode of the PNP tube Q1, the negative voltage electrode of the voltage control current source is connected between the cathode of the controllable precise voltage stabilizing source TL431 and the resistor R5, and the negative current electrode of the voltage control current source is connected with the negative electrode of the lithium battery.
Compared with the prior art, the invention can realize the balance control of the voltage when the battery pack of the electric vehicle is charged, ensure that the battery voltage does not exceed the maximum voltage under the condition that the external charger of the battery pack is out of control, and avoid faults such as battery explosion. Meanwhile, the charging circuit can realize the effect of derating the maximum charging voltage according to the battery temperature characteristic curve under the high temperature condition, and can automatically adjust the maximum charging voltage of the battery along with the change of the temperature under the high temperature. In addition, the circuit provided by the invention has the characteristics of simple structure, low cost, good practicability and the like, and has the advantages of mature circuit structure and the like.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The invention is further described in connection with the accompanying drawings and examples which are not to be construed as limiting the invention, but are intended to cover the full scope of the claims and will become more fully apparent to those of ordinary skill in the art from the following examples.
Examples: a battery pack charging control circuit of an electric vehicle with temperature compensation comprises a starting circuit, a charging control circuit and a current bypass circuit; the starting circuit is connected with the anode and the cathode of the lithium battery; the starting circuit is respectively connected with the charging control circuit and the current bypass, and the charging control circuit and the current bypass are also respectively connected with the cathode of the lithium battery; the output end of the charging control circuit is connected with the current bypass circuit; the charging control circuit comprises a sampling circuit, a difference solving circuit and a compensation circuit; the sampling circuit is used for collecting the voltage of the battery and controlling the maximum charging voltage change of the battery according to the temperature change; the difference solving circuit compares the sampling voltage with the built-in voltage so as to control the conduction degree of the difference solving circuit; the output end of the difference solving circuit is connected with the compensation circuit, and the compensation circuit outputs a control quantity according to the conduction degree of the difference solving circuit; the voltage-to-current circuit converts the control quantity into control current; the current bypass circuit adjusts the charging current of the lithium battery according to the control current, and realizes battery charging adjustment.
The working principle is as follows: when the external special charger is connected, if all the battery voltages do not reach the rated voltage V normal When the control circuits of all the batteries are not operated. Once the voltage reaches V normal When the corresponding control circuit starts to work, and monitors whether the battery voltage reaches the maximum charging voltage at the current temperature in real timeWhen the battery voltage is greater than V normal And is less than->When the current bypass circuit is not in operation, only very small current is used for maintaining the operation of the starting circuit and the control circuit. When the battery voltage is greater than +.>When the voltage of the VCCS is higher than the threshold voltage, the control circuit dynamically adjusts the current of the VCCS in real time so as to maintain the voltage of the battery at +.>
As shown in fig. 1, the starting circuit comprises a PNP transistor Q1, a resistor R1, and a zener diode Z1; emitter and emitter of PNP tube Q1The anode of the lithium battery is connected, the base electrode of the NPN tube Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the cathode of a zener diode Z1, and the anode of the zener diode Z1 is connected with the cathode of the lithium battery; and the collector electrode of the PNP tube is connected with the charging control circuit and the current bypass. The starting circuit is used for detecting whether the charging voltage of the battery reaches the rated voltage V in real time normal If V is reached normal The charge control circuit starts to operate; otherwise, the charge control circuit does not operate. Due to the fact that the battery voltage is smaller than the rated voltage V normal When the starting circuit does not work, the corresponding charging control circuit current is zero, so that the speed and efficiency of charging the electric vehicle battery in the earlier stage can be improved. After the starting circuit works, the charging control circuit acquires the battery voltage V in real time E Maximum charging voltage at the current temperatureThe difference voltage between the current bypass circuit and the voltage source is subjected to PI compensation circuit to obtain the control quantity of the current bypass circuit, the current of the current bypass circuit is regulated, the charging current of the battery is regulated, and the voltage V of the battery is regulated E Maximum charging voltage maintained at the current temperature +.>
The starting circuit of the embodiment ensures that the battery is rated at voltage V by reasonably selecting parameters of Q1, R1 and Z1 normal Q1 is conducted under the condition, so as to play a role in controlling a switch;
according to the battery charging specification, the battery voltage is lower than V normal When the battery is in a high current charging phase. Q1 is at V E ＝V normal The conduction can ensure that the charging control circuit is not shunted when the battery is charged with large current, and the charging speed and the charging efficiency are improved. On the other hand, the battery voltage reaches V normal When the charging control circuit is in a full state, the charging control circuit starts to operate. Because the charging current is smaller, the current is very small when the charging control circuit works, and the heating loss can be effectively reduced while the voltage clamping of the battery is realized;
in this embodiment, as shown in fig. 1, the sampling circuit includes a resistor R2 and a ptc thermistor R3; one end of the resistor R2 is connected with the collector of the PNP tube Q1, the other end of the resistor R2 is connected with the positive temperature coefficient thermistor R3, and the other end of the positive temperature coefficient thermistor R3 is connected with the negative electrode of the lithium battery. R2 and R3 form a sampling circuit for sampling the voltage of the battery E to obtain a sampling voltage v f The method comprises the following steps:V E is the battery voltage.
In this embodiment, the difference determining circuit includes a controllable precision voltage stabilizing source TL431 and a resistor R5, where the resistor R5 is TL431; the cathode of the controllable precise voltage stabilizing source TL431 is connected with one end of a resistor R5 and a compensation circuit, and the other end of the resistor R5 is connected with the collector of a PNP tube Q1; the anode of the controllable precise voltage stabilizing source TL431 is connected with the cathode of the lithium battery, and the input end of the controllable precise voltage stabilizing source TL431 is connected between the resistor R2 and the positive temperature coefficient thermistor R3. The principle of the difference circuit is that v is obtained by obtaining f The difference between the cathode and the anode of the TL431 and the TL431 is 2.5V, so that the conduction degree between the cathode and the anode of the TL431 is controlled. Briefly, the voltage v of the TL431 cathode c Subject v f -2.5 control, approximately in linear relationship.
In this embodiment, the compensation circuit includes a resistor R4 and a capacitor C1; one end of the resistor R4 is connected between the resistor R2 and the positive temperature coefficient thermistor R3, the other end of the resistor R4 is connected with one end of the capacitor C11, and the other end of the capacitor C11 is connected between the cathode of the controllable precise voltage stabilizing source TL431 and the resistor R5.
The principle of the charge control circuit in this embodiment is that when v f TL431 is off < 2.5; when v f At > 2.5, TL431 is on. Because R3 is positive temperature coefficient resistance, the higher the temperature is, the larger the R3 resistance value is, v f For V E The greater the partial pressure of (2), the moreCorresponding V E The smaller (e.g：/> Is the corresponding maximum charge voltage at 25 ℃). By reasonably selecting the relation between R3 and temperature, the +.>The relationship between the maximum voltage of the battery charge and the temperature is approximately met, and the automatic adjustment of the maximum voltage of the battery charge along with the change of the temperature under the high temperature condition is realized. R4 and C1 form a PI compensation circuit to realize v c PI compensation control of (a); r5 is used to regulate the current through TL 431.
In this embodiment, the current bypass circuit is composed of a Voltage Controlled Current Source (VCCS); the positive voltage electrode and the positive current electrode of the voltage control current source are connected with the collector electrode of the PNP tube Q1, the negative voltage electrode of the voltage control current source is connected between the cathode of the controllable precise voltage stabilizing source TL431 and the resistor R5, and the negative current electrode of the voltage control current source is connected with the negative electrode of the lithium battery. VCCS meetsAlpha is a control coefficient, < >>For the voltage across R5, +.>Due to v c For battery voltage V E Maximum charging voltage at the current temperature +.>The difference value between the two is obtained by a PI compensation circuit to obtain the control quantity of a current bypass circuit, so that VCCS can real-time calculate the voltage according to V E And->The difference between the two voltages is used for dynamically adjusting the bypass current, so as to further adjust the battery voltage V E Maximum charging voltage maintained at the current temperature +.>
In summary, the battery pack charging control circuit with temperature compensation provided by the invention can realize the balance of lithium battery charging at different temperatures, can effectively prolong the service life of the battery, and has the advantages of simple structure, good practicability and the like.

Claims (6)

1. An electric vehicle battery pack charge control circuit with temperature compensation, which is characterized in that: the charging control circuit comprises a starting circuit, a charging control circuit and a current bypass circuit; the starting circuit is connected with the anode and the cathode of the lithium battery; the starting circuit is respectively connected with the charging control circuit and the current bypass, and the charging control circuit and the current bypass are also respectively connected with the cathode of the lithium battery; the output end of the charging control circuit is connected with the current bypass circuit; the charging control circuit comprises a sampling circuit, a difference solving circuit and a compensation circuit; the sampling circuit is used for collecting the voltage of the battery and controlling the maximum charging voltage change of the battery according to the temperature change; the difference solving circuit compares the sampling voltage with the built-in voltage so as to control the conduction degree of the difference solving circuit; the output end of the difference solving circuit is connected with the compensation circuit, and the compensation circuit outputs a control quantity according to the conduction degree of the difference solving circuit; the voltage-to-current circuit converts the control quantity into control current; the current bypass circuit adjusts the charging current of the lithium battery according to the control current, and realizes battery charging adjustment.
2. The electric vehicle battery pack charge control circuit with temperature compensation according to claim 1, wherein: the starting circuit comprises a PNP tube Q1, a resistor R1 and a zener diode Z1; the emitter of the PNP tube Q1 is connected with the positive electrode of the lithium battery, the base electrode of the NPN tube Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the cathode of a zener diode Z1, and the anode of the zener diode Z1 is connected with the negative electrode of the lithium battery; and the collector electrode of the PNP tube is connected with the charging control circuit and the current bypass.
3. The electric vehicle battery pack charge control circuit with temperature compensation according to claim 2, wherein: the sampling circuit comprises a resistor R2 and a positive temperature coefficient thermistor R3; one end of the resistor R2 is connected with the collector of the PNP tube Q1, the other end of the resistor R2 is connected with the positive temperature coefficient thermistor R3, and the other end of the positive temperature coefficient thermistor R3 is connected with the negative electrode of the lithium battery.
4. The electric vehicle battery pack charge control circuit with temperature compensation according to claim 3, wherein: the difference solving circuit comprises a controllable precise voltage stabilizing source TL431 and a resistor R5; the cathode of the controllable precise voltage stabilizing source TL431 is connected with one end of a resistor R5 and a compensation circuit, and the other end of the resistor R5 is connected with the collector of a PNP tube Q1; the anode of the controllable precise voltage stabilizing source TL431 is connected with the cathode of the lithium battery, and the input end of the controllable precise voltage stabilizing source TL431 is connected between the resistor R2 and the positive temperature coefficient thermistor R3.
5. The electric vehicle battery pack charge control circuit with temperature compensation according to claim 4, wherein: the compensation circuit comprises a resistor R4 and a capacitor C1; one end of the resistor R4 is connected between the resistor R2 and the positive temperature coefficient thermistor R3, the other end of the resistor R4 is connected with one end of the capacitor C11, and the other end of the capacitor C11 is connected between the cathode of the controllable precise voltage stabilizing source TL431 and the resistor R5.
6. The electric vehicle battery pack charge control circuit with temperature compensation according to claim 4, wherein: the current bypass circuit consists of a voltage-controlled current source; the positive voltage electrode and the positive current electrode of the voltage control current source are connected with the collector electrode of the PNP tube Q1, the negative voltage electrode of the voltage control current source is connected between the cathode of the controllable precise voltage stabilizing source TL431 and the resistor R5, and the negative current electrode of the voltage control current source is connected with the negative electrode of the lithium battery.
CN202310351066.4A 2023-04-04 2023-04-04 Electric vehicle battery pack charging control circuit with temperature compensation function Pending CN116512988A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310351066.4A CN116512988A (en) 2023-04-04 2023-04-04 Electric vehicle battery pack charging control circuit with temperature compensation function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310351066.4A CN116512988A (en) 2023-04-04 2023-04-04 Electric vehicle battery pack charging control circuit with temperature compensation function

Publications (1)

Publication Number Publication Date
CN116512988A true CN116512988A (en) 2023-08-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310351066.4A Pending CN116512988A (en) 2023-04-04 2023-04-04 Electric vehicle battery pack charging control circuit with temperature compensation function

Country Status (1)

Country Link
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