CN114407725B - Battery pack charging circuit and method for avoiding jump of battery pack total voltage acquisition value - Google Patents
Battery pack charging circuit and method for avoiding jump of battery pack total voltage acquisition value Download PDFInfo
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- CN114407725B CN114407725B CN202210182796.1A CN202210182796A CN114407725B CN 114407725 B CN114407725 B CN 114407725B CN 202210182796 A CN202210182796 A CN 202210182796A CN 114407725 B CN114407725 B CN 114407725B
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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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
- 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
- B60L53/10—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 characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- 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
-
- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a battery pack charging circuit and a method for avoiding total voltage acquisition value jump of a battery pack, which cancel a main negative relay, reduce cost, realize the purposes of reducing cost and enhancing efficiency, and avoid the total voltage acquisition value jump of the battery pack by controlling the opening/closing of a first controllable switch K1 and a second controllable switch K2, thereby avoiding the complaint of charging of users.
Description
Technical Field
The invention belongs to the field of battery management control of new energy automobiles, and particularly relates to a battery pack charging circuit and a method for avoiding jump of a total voltage acquisition value of a battery pack.
Background
Along with the popularization of new energy automobiles, the battery management controller is used as a control brain of a new energy automobile battery, the battery data acquisition is used as a basis for diagnosing a battery safety strategy, and the battery management controller is an important signal for interaction with a charging pile, and the accuracy and the stability of the battery management controller are particularly important. The key signal that battery management controller first gathered is the total voltage of battery package, at the circumstances of the present big cost reduction efficiency, how to avoid the jump of total voltage collection value of battery package is the current urgent problem that needs to be solved.
Disclosure of Invention
The invention aims to provide a battery pack charging circuit and a method for avoiding jump of a total voltage acquisition value of a battery pack, so as to reduce cost and avoid the situation that the total voltage acquisition value of the battery pack jumps.
The invention relates to a battery pack charging circuit, which comprises a battery management controller, a main positive relay, a positive insulation resistor Rp, a negative insulation resistor Rn, a motor controller X capacitor, a charging gun interface, a voltage dividing resistor module I, a first sampling resistor R1, a first controllable switch K1, a voltage dividing resistor module II, a second sampling resistor R2 and a second controllable switch K2, wherein the battery management controller is connected with the main positive relay; one end of a motor controller X capacitor is connected with the positive end of the charging gun interface, and the controlled end of the main positive relay is connected with the positive electrode of the battery pack BT1, and the other end of the motor controller X capacitor is connected with the negative end of the charging gun interface and the negative electrode of the battery pack BT 1; the voltage dividing resistor module I is connected with a controlled end of the first controllable switch K1 in series to serve as a first module, one end of the first module is connected with the positive electrode of the battery pack BT1, the other end of the first module is connected with one end of the first sampling resistor R1 and a first voltage acquisition end of the battery management controller, and the other end of the first sampling resistor R1 is connected with a grounding end of a charging gun interface; the voltage dividing resistor module II is connected with a controlled end of the second controllable switch K2 in series to serve as a second module, one end of the second module is connected with the negative electrode of the battery pack BT1, the other end of the second module is connected with one end of the second sampling resistor R2 and a second voltage acquisition end of the battery management controller, and the other end of the second sampling resistor R2 is connected with the grounding end of the charging gun interface; the control end of the main positive relay, the control end of the first controllable switch K1 and the control end of the second controllable switch K2 are respectively connected with three control signal output ends of the battery management controller.
Preferably, the voltage dividing resistor module i includes a first voltage dividing resistor R3 and a second voltage dividing resistor R4, where the first voltage dividing resistor R3 is connected in series with the second voltage dividing resistor R4; the voltage dividing resistor module II comprises a third voltage dividing resistor R5 and a fourth voltage dividing resistor R6, and the third voltage dividing resistor R5 is connected with the fourth voltage dividing resistor R6 in series.
Preferably, the first controllable switch K1 and the second controllable switch K2 are optocouplers or relays, and are controlled by a battery management controller.
The battery pack charging circuit cancels the main negative relay, reduces cost and achieves the purposes of reducing cost and enhancing efficiency. However, after the main negative relay is canceled, if the balance bridge method is adopted for the detection of the total voltage of the battery pack, the pulse signal injection method is adopted for the insulation detection of the charging pile, and in the direct-current quick charging scene of the battery pack, in the charging handshake interaction stage, the pulse signal of the charging pile is injected into the acquisition loop of the battery management controller through the loop, the jump of the total voltage acquisition value is caused to exceed the safety threshold value, the vehicle is caused to exit the charging mode, and the client cannot charge the vehicle.
In order to reduce the cost and increase the efficiency and simultaneously avoid the jump of the total voltage acquisition value in the battery pack charging, a method for avoiding the jump of the total voltage acquisition value of the battery pack is designed.
The method for avoiding jump of the total voltage acquisition value of the battery pack, which is disclosed by the invention, adopts the battery pack charging circuit, and comprises the following steps:
s1, the battery management controller controls the first controllable switch K1 and the second controllable switch K2 to be closed after detecting the gun inserting signal, and then S2 is executed.
S2, the battery management controller collects a first voltage U1 and a second voltage U2, calculates a total voltage collection value based on the first voltage U1 and the second voltage U2, and then executes S3.
And S3, the battery management controller judges whether a handshake signal sent by the charging pile and a signal of the charging pile insulation detection about to be injected with a pulse are received, if so, the S4 is executed, and otherwise, the S2 is executed in a return mode.
S4, the battery management controller controls the first controllable switch K1 and the second controllable switch K2 to be opened, the first voltage and the second voltage are stopped being acquired, and then S5 is executed.
And S5, the battery management controller takes the total voltage acquisition value of the previous period as the total voltage acquisition value of the current period, and then S6 is executed.
And S6, the battery management controller judges whether a charging pile insulation detection completion signal sent by the charging pile is received, if so, the S7 is executed, and otherwise, the S5 is executed in a return mode.
And S7, the battery management controller controls the first controllable switch K1 and the second controllable switch K2 to be closed, and then the execution returns to S2.
The invention can realize cost reduction and efficiency improvement, and avoid the condition that the total voltage acquisition value jumps in the charging process of the battery pack, and can not cause the complaint of the charging of users.
Drawings
Fig. 1 is a schematic diagram of a battery pack charging circuit (charging pile is turned on) in the present embodiment.
Fig. 2 is a control schematic diagram of the present embodiment.
Fig. 3 is a flowchart of a method for avoiding jump of the total voltage acquisition value of the battery pack in this embodiment.
Detailed Description
As shown in fig. 1 and 2, the battery pack charging circuit in the present embodiment includes a battery management controller 1, a main positive relay 2, a positive insulation resistor Rp, a negative insulation resistor Rn, a voltage dividing resistor module i, a first sampling resistor R1, a first controllable switch K1, a voltage dividing resistor module ii, a second sampling resistor R2, a second controllable switch K2, a motor controller X capacitor 3, and a charging gun interface 4. The voltage dividing resistor module I comprises a first voltage dividing resistor R3 and a second voltage dividing resistor R4, and the voltage dividing resistor module II comprises a third voltage dividing resistor R5 and a fourth voltage dividing resistor R6. The positive insulation resistance Rp refers to the resistance between the positive electrode of the battery pack BT1 and GND ground, and the negative insulation resistance Rn refers to the resistance between the negative electrode of the battery pack BT1 and GND ground. The first controllable switch K1 and the second controllable switch K2 both use optocouplers (relays may also be used).
One end of the motor controller X capacitor 3 is connected with the positive end of the charging gun interface 4, and the controlled end of the main positive relay 2 is connected with the positive electrode of the battery pack BT1, and the other end of the motor controller X capacitor 3 is connected with the negative end of the charging gun interface 4 and the negative electrode of the battery pack BT 1.
The first divider resistor R3, the controlled end of the first controllable switch K1 and the second divider resistor R4 are sequentially connected in series to serve as a first module, one end of the first divider resistor R3 (namely one end of the first module) is connected with the positive electrode of the battery pack BT1, one end of the second divider resistor R4 (namely the other end of the first module) is connected with one end of the first sampling resistor R1 and the first voltage acquisition end of the battery management controller 1, and the other end of the first sampling resistor R1 is connected with the grounding end (also connected with GND) of the charging gun interface 4.
The third voltage dividing resistor R5, the controlled end of the second controllable switch K2 and the fourth voltage dividing resistor R6 are sequentially connected in series to serve as a second module, one end of the third voltage dividing resistor R5 (namely one end of the second module) is connected with the negative electrode of the battery pack BT1, one end of the fourth voltage dividing resistor R6 (namely the other end of the second module) is connected with one end of the second sampling resistor R2 and the second voltage acquisition end of the battery management controller 1, and the other end of the second sampling resistor R2 is connected with the grounding end (also connected with GND) of the charging gun interface 4.
The control end of the main positive relay 2, the control end of the first controllable switch K1 and the control end of the second controllable switch K2 are respectively connected with three control signal output ends of the battery management controller 1.
During charging, a charging gun is inserted into the charging gun interface 4 and used for realizing signal and energy interaction between a vehicle and a charging pile and charging the vehicle.
The charging pile can be charged directly and quickly, the charging pile insulation detection circuit comprises a fifth voltage dividing resistor R7, a sixth voltage dividing resistor R8, a third sampling resistor R9, a fourth sampling resistor R10 and an insulation resistor Rp 'of the charging pile main body to the ground, the charging pile main body is negative to the insulation resistor Rn' of the ground, the charging pile insulation detection adopts a pulse injection method, a pulse generator generates positive and negative pulses, the positive and negative pulses are injected into R7, R8, R9, R10 and Rp 'Rn', and the voltage U3 on the third sampling resistor R9 and the voltage U4 on the fourth sampling resistor R10 are collected to calculate the insulation value of the charging pile tip.
The problem of jump of the total voltage acquisition value of the battery pack is that the pulse generated by the pulse generator in the charging pile causes jump of the second voltage U2, so that the calculation of the total voltage acquisition value is wrong. For example, the total voltage of the battery pack is 500V, the collection value of the voltage division value (namely, the second voltage U2) on the second sampling resistor R2 should be negative voltage of-2.5V, after the battery management controller controls the first controllable switch K1 and the second controllable switch K2 to be closed, the first voltage U1 and the second voltage U2 are collected, and the total voltage collection value is calculated based on the first voltage U1 and the second voltage U2. After the charging gun is inserted, the pulse signal of the charging pile passes through a loop path of GND ground wire, R2, R6, K2, R5, a motor controller X capacitor, R7, R9 and GND-ISO ground wire, positive pressure is generated on the second sampling resistor R2, and positive pressure fluctuation is generated on a partial pressure value acquisition value (namely a second voltage U2) on the second sampling resistor R2, so that the total voltage acquisition value jumps; the problem is that the loop enables the external pulse signal to be connected in series to interfere with the total voltage sampling.
As shown in fig. 3, the present embodiment provides a method for cutting off a pulse loop path in the process to solve the problem of jump of the total voltage acquisition value, that is, the present embodiment provides a method for avoiding jump of the total voltage acquisition value of a battery pack, and the method is executed by the battery management controller 1 by adopting the above battery pack charging circuit, and includes the following steps:
s1, after a gun inserting signal is detected, the first controllable switch K1 and the second controllable switch K2 are controlled to be closed, and then S2 is executed. If the pre-gun-insertion vehicle is in a dormant state, the post-gun-insertion battery management controller is awakened.
S2, collecting a first voltage U1 and a second voltage U2, calculating a total voltage collecting value based on the first voltage U1 and the second voltage U2, and then executing S3.
And S3, judging whether a handshake signal sent by the charging pile and a signal (CHM message) to be injected into the charging pile insulation detection are received, if so, executing S4, otherwise, returning to executing S2. After the charging pile sends a handshake signal and a signal to be injected into the pulse is detected by the charging pile insulation, the pulse signal is injected.
S4, controlling the first controllable switch K1 and the second controllable switch K2 to be opened, stopping collecting the first voltage and the second voltage, and then executing S5. After the first controllable switch K1 and the second controllable switch K2 are disconnected, the loop path of GND ground wire, R2, R6, K2, R5, motor controller X capacitor, R7, R9 and GND_ISO ground wire is disconnected, positive pressure can not be generated on the second sampling resistor R2, and positive pressure fluctuation can not be generated.
S5, taking the total voltage acquisition value of the previous period as the total voltage acquisition value of the current period, and then executing S6.
And S6, judging whether a charging pile insulation detection completion signal (CRM message) sent by the charging pile is received, if so, executing S7, otherwise, returning to executing S5.
S7, controlling the first controllable switch K1 and the second controllable switch K2 to be closed, and then returning to execute S2.
Claims (4)
1. The utility model provides a battery package charging circuit, includes battery management controller (1), main positive relay (2), positive insulation resistance Rp, negative insulation resistance Rn, motor controller X electric capacity (3) and rifle interface (4) that charges, its characterized in that: the circuit also comprises a voltage dividing resistor module I, a first sampling resistor R1, a first controllable switch K1, a voltage dividing resistor module II, a second sampling resistor R2 and a second controllable switch K2; one end of a motor controller X capacitor is connected with the positive end of the charging gun interface (4), and the controlled end of the main positive relay (2) is connected with the positive electrode of the battery pack BT1, and the other end of the motor controller X capacitor is connected with the negative end of the charging gun interface (4) and the negative electrode of the battery pack BT 1; the voltage dividing resistor module I is connected in series with a controlled end of the first controllable switch K1 to serve as a first module, one end of the first module is connected with the positive electrode of the battery pack BT1, the other end of the first module is connected with one end of the first sampling resistor R1 and a first voltage acquisition end of the battery management controller (1), and the other end of the first sampling resistor R1 is connected with the grounding end of the charging gun interface (4); the voltage dividing resistor module II is connected with a controlled end of the second controllable switch K2 in series to serve as a second module, one end of the second module is connected with the negative electrode of the battery pack BT1, the other end of the second module is connected with one end of the second sampling resistor R2 and a second voltage acquisition end of the battery management controller (1), and the other end of the second sampling resistor R2 is connected with the grounding end of the charging gun interface (4); the control end of the main positive relay (2), the control end of the first controllable switch K1 and the control end of the second controllable switch K2 are respectively connected with three control signal output ends of the battery management controller (1);
the method for avoiding jump of the total voltage acquisition value of the battery pack comprises the following steps:
s1, a battery management controller (1) controls a first controllable switch K1 and a second controllable switch K2 to be closed after detecting a gun inserting signal, and then S2 is executed;
s2, a battery management controller (1) collects a first voltage U1 and a second voltage U2, calculates a total voltage collection value based on the first voltage U1 and the second voltage U2, and then executes S3;
s3, the battery management controller (1) judges whether a handshake signal sent by the charging pile and a signal to be injected with a pulse is received by the insulating detection of the charging pile, if so, the step S4 is executed, and otherwise, the step S2 is executed in a return mode;
s4, the battery management controller (1) controls the first controllable switch K1 and the second controllable switch K2 to be opened, the collection of the first voltage and the second voltage is stopped, and then S5 is executed;
s5, the battery management controller (1) takes the total voltage acquisition value of the previous period as the total voltage acquisition value of the current period, and then S6 is executed;
s6, the battery management controller (1) judges whether a charging pile insulation detection finishing signal sent by the charging pile is received, if yes, S7 is executed, and otherwise S5 is executed in a return mode;
s7, the battery management controller (1) controls the first controllable switch K1 and the second controllable switch K2 to be closed, and then the execution S2 is returned.
2. The battery pack charging circuit of claim 1, wherein: the voltage dividing resistor module I comprises a first voltage dividing resistor R3 and a second voltage dividing resistor R4, and the first voltage dividing resistor R3 is connected with the second voltage dividing resistor R4 in series; the voltage dividing resistor module II comprises a third voltage dividing resistor R5 and a fourth voltage dividing resistor R6, and the third voltage dividing resistor R5 is connected with the fourth voltage dividing resistor R6 in series.
3. The battery pack charging circuit according to claim 1 or 2, wherein: the first controllable switch K1 and the second controllable switch K2 are optocouplers.
4. The battery pack charging circuit according to claim 1 or 2, wherein: the first controllable switch K1 and the second controllable switch K2 are relays.
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| CN202210182796.1A CN114407725B (en) | 2022-02-26 | 2022-02-26 | Battery pack charging circuit and method for avoiding jump of battery pack total voltage acquisition value |
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| CN202210182796.1A CN114407725B (en) | 2022-02-26 | 2022-02-26 | Battery pack charging circuit and method for avoiding jump of battery pack total voltage acquisition value |
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