CN111907353A - Circuit control method and pre-charging circuit after power battery is powered on - Google Patents
Circuit control method and pre-charging circuit after power battery is powered on Download PDFInfo
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- CN111907353A CN111907353A CN202010667238.5A CN202010667238A CN111907353A CN 111907353 A CN111907353 A CN 111907353A CN 202010667238 A CN202010667238 A CN 202010667238A CN 111907353 A CN111907353 A CN 111907353A
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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
- B60L53/20—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 converters located in the vehicle
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
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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
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
- B60L2210/14—Boost converters
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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
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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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- 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
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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)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a circuit control method and a pre-charging circuit after a power battery is electrified, which are applied to the pre-charging stage after the power battery is electrified, wherein the circuit control method comprises the following steps: after receiving a power-on command, closing the negative electrode end of the power battery; acquiring the total voltage of the power battery; and boosting the voltage of the output end of the storage battery connected with the bus to a first preset value and charging an energy storage element of a load, wherein the first preset value is lower than the total voltage of the power battery. In the pre-charging stage, the voltage at the output end of the storage battery is converted from low voltage to high voltage and charges the energy storage element of the load, and the numerical value of the high voltage can be converted, so that the pre-charging time can be adjusted; the original scheme is replaced (the auxiliary switch and the voltage reduction element are connected in parallel with the main switch in series for pre-charging), so that the design of a pre-charging loop and the type selection of electric devices can be eliminated.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to a circuit control method and a pre-charging circuit after a power battery is powered on.
Background
The existing pure electric and plug-in hybrid protection scheme is a technical scheme of adding a pre-charging loop in the loop, specifically, a resistor and a relay are connected in parallel, so that pre-charging is carried out in a resistor current-limiting mode, and the pre-charging process is completed after 95% of the total voltage of a battery system is reached.
However, the prior art has the problem that the pre-charging time cannot be adjusted, so that once the technical scheme is confirmed, the pre-charging time is solidified and cannot be adjusted according to requirements.
Therefore, it is an urgent technical problem to design a circuit control method for adjusting the pre-charge time according to the requirement.
Disclosure of Invention
In order to solve the problem that the pre-charging time is solidified and cannot be adjusted according to the requirement in the prior art, the present invention provides a circuit control method for adjusting the pre-charging time according to the requirement, which is an urgent technical problem to be solved in the art.
The technical scheme adopted by the invention is to design a circuit control method, which is applied to a pre-charging stage after a power battery is electrified, and the circuit control method comprises the following steps:
after receiving a power-on command, closing the negative electrode end of the power battery;
acquiring the total voltage of the power battery;
boosting the voltage of the output end of a storage battery connected with a bus to a first preset value and charging an energy storage element of a load, wherein the first preset value is lower than the total voltage of the power battery;
when the electric quantity of the energy storage element of the load reaches a second preset value, closing the positive electrode end of the power battery, wherein the second preset value is lower than the total voltage of the power battery;
and reducing the voltage of the output end of the storage battery to an initial value.
Further, the step of boosting the voltage at the output end of the storage battery connected to the bus to a first preset value specifically includes:
the voltage at the output end of the storage battery is boosted to a first preset value through a boosting unit connected with the storage battery and the bus.
Further, the step of boosting the voltage at the output end of the storage battery connected to the bus to a first preset value specifically includes:
and boosting the voltage at the output end of the storage battery to a first preset value by controlling a DC/DC converter connected with the storage battery and the bus.
Further, after the step of closing the negative terminal of the power battery after receiving the power-on command, the method further includes:
initializing and self-checking each controller;
and when each controller is initialized and qualified through self-inspection, the step of acquiring the total voltage of the power battery is started.
Further, after the step of self-checking if each controller is initialized, the method further comprises the following steps:
checking the voltage and the temperature of a cell inside the power battery;
and when the voltage and the temperature of the electric core in the power battery are qualified, the step of obtaining the total voltage of the power battery is carried out.
Further, when the internal cell voltage and the internal temperature of the power battery are qualified, the method further comprises the following steps:
detecting the insulation of the bus;
and when the bus insulation is detected to be qualified, the step of acquiring the total voltage of the power battery is carried out.
Further, the first preset value is 0.95 times of the total voltage of the power battery.
Further, the second preset value is 5V smaller than the total voltage of the power battery.
The invention also designs a pre-charging circuit after the power battery is electrified, which is characterized in that: the pre-charging circuit after the power battery is electrified comprises a power battery, a relay group, a voltage conversion unit and a storage battery which are sequentially and electrically connected, wherein the power battery is electrically connected with the voltage conversion unit and a load through the relay group, and the voltage conversion unit is also electrically connected with the storage battery and used for changing the voltage value of the storage battery output end.
Further, the voltage conversion unit includes a controller and a DC/DC converter;
the controller and the DC/DC converter are respectively electrically connected with the relay group and the storage battery, and the controller and the DC/DC converter are matched for changing the voltage value of the output end of the storage battery.
The invention has the beneficial effects that: in the pre-charging stage, the voltage at the output end of the storage battery is converted from low voltage to high voltage and charges an energy storage element of a load, and the numerical value of the high voltage can be converted, so that the pre-charging time can be adjusted; the original scheme is replaced (the auxiliary switch and the voltage reduction element are connected in parallel with the main switch in series for pre-charging), so that the design of a pre-charging loop and the type selection of electric devices can be eliminated.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
fig. 1 is a flowchart of a circuit control method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a circuit control method according to an embodiment of the present invention;
FIG. 3 is a detailed flowchart of another circuit control method according to an embodiment of the present invention;
fig. 4 is a block diagram of a pre-charging circuit after a power battery is powered on according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention changes the voltage of the output end of the storage battery in the pre-charging stage, thereby replacing the original scheme of using a fixed element in the pre-charging stage, removing the design of a pre-charging loop and the model selection of an electric device, and adjusting the pre-charging time.
Referring to fig. 1, the present invention discloses a circuit control method applied to a pre-charging stage after a power battery is powered on, the circuit control method includes:
step S10: after receiving a power-on command, closing the negative electrode end of the power battery;
in a specific application, the power battery supplies power to an external load, generally, a driver starts a vehicle, a key is set to be in an ON position, and a power battery negative electrode relay is closed;
step S20: acquiring the total voltage of the power battery;
specifically, a battery pack of the electric automobile is formed by connecting a plurality of battery cells in parallel to form a plurality of packs (bag bodies) and then connecting the pack bodies in series to form a plurality of modules (modules), so that a required voltage output platform of about 400-700 v is achieved, and some batteries are lower and higher, depending on the output and load requirements of the battery pack;
step S30: boosting the voltage of the output end of a storage battery connected with a bus to a first preset value and charging an energy storage element of a load, wherein the first preset value is lower than the total voltage of the power battery;
specifically, in the pre-charging stage, the voltage at the output end of the storage battery is converted from low voltage to high voltage and charges an energy storage element of a load, the numerical value of the high voltage can be converted, and the pre-charging time can be adjusted;
the original scheme is replaced (the auxiliary switch and the voltage reduction element are connected in parallel with the main switch in a communicated mode for pre-charging), so that the design of a pre-charging loop and the type selection of electric devices can be eliminated;
it should be noted that, in the pre-charging stage, each component performs corresponding work and feeds back corresponding information according to the state of the state machine, so that the pre-charging current can be fed back;
step S40: when the electric quantity of the energy storage element of the load reaches a second preset value, closing the positive electrode end of the power battery, wherein the second preset value is lower than the total voltage of the power battery;
specifically, when the electric quantity of the energy storage element of the load reaches a second preset value, that is, the pre-charging stage is completed, the load (that is, the power motor) can be powered by the power battery;
step S50: reducing the voltage of the output end of the storage battery to an initial value;
in an application scenario, the initial voltage value of the battery is 24V, the time difference between closing the positive terminal of the power battery and reducing the voltage at the output terminal of the battery to the initial value is 10ms, and then the load is powered only by the power battery.
Referring to fig. 2, the present invention also discloses a circuit control method, which is applied to the pre-charging stage after the power battery is powered on, and the circuit control method includes:
step S100: after receiving a power-on command, closing the negative electrode end of the power battery;
in a specific application, the power battery supplies power to an external load, generally, a driver starts a vehicle, a key is set to be in an ON position, and a power battery negative electrode relay is closed;
after the step of closing the negative electrode end of the power battery after receiving the power-on command, the method also comprises steps S110-S130;
step S110: initializing and self-checking each controller;
in an application scene, each controller of the whole vehicle high-voltage system is initialized and self-checked, and CAN line reporting is carried out after the initialization and self-checking are finished;
when each controller is initialized and qualified through self-inspection, the step S120 is carried out;
step S120: checking the voltage and the temperature of a cell inside the power battery;
in an application scene, the power battery checks the voltage and the temperature of an internal cell;
when the voltage and the temperature of the electric core in the power battery are qualified, the step S130 is executed;
step S130: detecting the insulation of the bus;
when the bus bar insulation is detected to be qualified, the process proceeds to step S200.
Step S200: acquiring the total voltage of the power battery;
specifically, a battery pack of the electric automobile is formed by connecting a plurality of battery cells in parallel to form a plurality of packs (bag bodies) and then connecting the pack bodies in series to form a plurality of modules (modules), so that a required voltage output platform of about 400-700 v is achieved, and some batteries are lower and higher, depending on the output and load requirements of the battery pack;
in an application scene, a resistor array for detecting the voltage of the battery core obtains the voltage value of the battery core, a detection line is led out from the anode and the cathode of each battery core, and before the detection line is connected to the resistor corresponding to the resistor array, the detection resistor is sequentially connected through a measurement circuit on a control board, so that the voltage value of a certain battery core can be taken out from the detection resistor, the measurement circuit on the control board compares, calculates and judges the detected voltage value of each battery core, so that the value of the total voltage of the power battery can be obtained, and the value is used as a standard for being subsequently used as a reference;
step S300: boosting the voltage of the output end of a storage battery connected with a bus to a first preset value and charging an energy storage element of a load, wherein the first preset value is lower than the total voltage of the power battery;
the step of boosting the voltage of the output end of the storage battery connected with the bus to a first preset value specifically comprises:
boosting the voltage at the output end of the storage battery to a first preset value through a boosting unit connected with the storage battery and the bus; in an application scenario, the first preset value is 0.95 times of the total voltage of the power battery;
specifically, in the pre-charging stage, the voltage at the output end of the storage battery is converted from low voltage to high voltage and charges an energy storage element of a load, the numerical value of the high voltage can be converted, and the pre-charging time can be adjusted;
the original scheme is replaced (the auxiliary switch and the voltage reduction element are connected in parallel with the main switch in a communicated mode for pre-charging), so that the design of a pre-charging loop and the type selection of electric devices can be eliminated;
it should be noted that, in the pre-charging stage, each component performs corresponding work and feeds back corresponding information according to the state of the state machine, so that the pre-charging current can be fed back;
step S400: when the electric quantity of the energy storage element of the load reaches a second preset value, closing the positive electrode end of the power battery, wherein the second preset value is lower than the total voltage of the power battery;
in an application scenario, when the difference between the second preset value (i.e. the charging voltage) and the total voltage of the power battery is less than 5V, the pre-charging is considered to be finished;
specifically, when the electric quantity of the energy storage element of the load reaches a second preset value, that is, the pre-charging stage is completed, the load (that is, the power motor) can be powered by the power battery;
step S500: reducing the voltage of the output end of the storage battery to an initial value;
in an application scenario, the initial voltage value of the battery is 24V, the time difference between closing the positive terminal of the power battery and reducing the voltage at the output terminal of the battery to the initial value is 10ms, and then the load is powered only by the power battery.
Referring to fig. 3, the present invention also discloses a circuit control method, which is applied to the pre-charging stage after the power battery is powered on, and the circuit control method includes:
step a: after receiving a power-on command, closing the negative electrode end of the power battery;
in a specific application, the power battery supplies power to an external load, generally, a driver starts a vehicle, a key is set to be in an ON position, and a power battery negative electrode relay is closed;
after the step of closing the negative terminal of the power battery after receiving the power-on command, the method further comprises the steps of a1-a 3:
step a 1: initializing and self-checking each controller;
when each controller is initialized and qualified by self-inspection, the step a2 is carried out;
step a 2: checking the voltage and the temperature of a cell inside the power battery;
when the voltage and the temperature of the internal battery cell of the power battery are qualified, entering a step a 3;
step a 3: detecting the insulation of the bus;
when the bus insulation is detected to be qualified, entering the step b;
step b: acquiring the total voltage of the power battery;
specifically, a battery pack of the electric automobile is formed by connecting a plurality of battery cells in parallel to form a plurality of packs (bag bodies) and then connecting the pack bodies in series to form a plurality of modules (modules), so that a required voltage output platform of about 400-700 v is achieved, and some batteries are lower and higher, depending on the output and load requirements of the battery pack;
in an application scene, a resistor array for detecting the voltage of the battery core obtains the voltage value of the battery core, a detection line is led out from the anode and the cathode of each battery core, and before the detection line is connected to the resistor corresponding to the resistor array, the detection resistor is sequentially connected through a measurement circuit on a control board, so that the voltage value of a certain battery core can be taken out from the detection resistor, the measurement circuit on the control board compares, calculates and judges the detected voltage value of each battery core, so that the value of the total voltage of the power battery can be obtained, and the value is used as a standard for being subsequently used as a reference;
step c: boosting the voltage of the output end of a storage battery connected with a bus to a first preset value and charging an energy storage element of a load, wherein the first preset value is lower than the total voltage of the power battery;
the step of boosting the voltage of the output end of the storage battery connected with the bus to a first preset value specifically comprises:
boosting the voltage at the output end of the storage battery to a first preset value by controlling a DC/DC converter connected with the storage battery and a bus; in an application scenario, the first preset value is 0.95 times of the total voltage of the power battery;
specifically, in the pre-charging stage, the voltage at the output end of the storage battery is converted from low voltage to high voltage and charges an energy storage element of a load, the numerical value of the high voltage can be converted, and the pre-charging time can be adjusted;
the original scheme is replaced (the auxiliary switch and the voltage reduction element are connected in parallel with the main switch in a communicated mode for pre-charging), so that the design of a pre-charging loop and the type selection of electric devices can be eliminated;
it should be noted that, in the pre-charging stage, each component performs corresponding work and feeds back corresponding information according to the state of the state machine, so that the pre-charging current can be fed back;
step d: when the electric quantity of the energy storage element of the load reaches a second preset value, closing the positive electrode end of the power battery, wherein the second preset value is lower than the total voltage of the power battery;
in an application scenario, when the difference between the second preset value (i.e. the charging voltage) and the total voltage of the power battery is less than 5V, the pre-charging is considered to be finished;
specifically, when the electric quantity of the energy storage element of the load reaches a second preset value, that is, the pre-charging stage is completed, the load (that is, the power motor) can be powered by the power battery;
step e: reducing the voltage of the output end of the storage battery to an initial value;
in an application scenario, the initial voltage value of the battery is 24V, the time difference between closing the positive terminal of the power battery and reducing the voltage at the output terminal of the battery to the initial value is 10ms, and then the load is powered only by the power battery.
Referring to fig. 4, the present invention also discloses a pre-charging circuit after the power battery is powered on, which is characterized in that: the pre-charging circuit after the power battery is powered on comprises a power battery 10, a relay group (k1, k2), a voltage conversion unit 40 and a storage battery 50 which are electrically connected in sequence, wherein the power battery 10 is electrically connected with the voltage conversion unit 40 and a load 30 through the relay group (k1, k2), and the voltage conversion unit 40 is also electrically connected with the storage battery 50 and is used for changing the voltage value of the output end of the storage battery 50; when entering the pre-charging stage, the voltage at the output end of the storage battery 50 is changed by the voltage conversion unit 40 and is merged into the bus m, so that the original scheme can be replaced, the design of the pre-charging loop and the type selection of the electric device can be eliminated, the design efficiency is improved, and the cost is reduced.
Preferably, the voltage conversion unit 40 includes a controller 41 and a DC/DC converter 42; the controller 41 and the DC/DC converter 42 are electrically connected to the relay sets (k1, k2) and the battery 50, respectively, and the controller 41 and the DC/DC converter 42 are used in cooperation to change the voltage value at the output terminal of the battery 50, it should be noted that the pre-charging circuit after the power battery is powered up further includes a charging port 20 electrically connected to the bus m.
The foregoing examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the claims of the present application.
Claims (10)
1. A circuit control method is applied to a pre-charging stage after a power battery is powered on, and is characterized by comprising the following steps:
after receiving a power-on command, closing the negative electrode end of the power battery;
acquiring the total voltage of the power battery;
boosting the voltage of the output end of a storage battery connected with a bus to a first preset value and charging an energy storage element of a load, wherein the first preset value is lower than the total voltage of the power battery;
when the electric quantity of the energy storage element of the load reaches a second preset value, closing the positive electrode end of the power battery, wherein the second preset value is lower than the total voltage of the power battery;
and reducing the voltage of the output end of the storage battery to an initial value.
2. The circuit control method according to claim 1, wherein: the step of boosting the voltage of the output end of the storage battery connected with the bus to a first preset value specifically comprises:
the voltage at the output end of the storage battery is boosted to a first preset value through a boosting unit connected with the storage battery and the bus.
3. The circuit control method according to claim 1, wherein: the step of boosting the voltage of the output end of the storage battery connected with the bus to a first preset value specifically comprises:
and boosting the voltage at the output end of the storage battery to a first preset value by controlling a DC/DC converter connected with the storage battery and the bus.
4. The circuit control method according to claim 1, wherein: after the step of closing the negative terminal of the power battery after receiving the power-on command, the method further includes:
initializing and self-checking each controller;
and when each controller is initialized and qualified through self-inspection, the step of acquiring the total voltage of the power battery is started.
5. The circuit control method according to claim 4, wherein: after the step of self-checking if each controller is initialized, further comprising:
checking the voltage and the temperature of a cell inside the power battery;
and when the voltage and the temperature of the electric core in the power battery are qualified, the step of obtaining the total voltage of the power battery is carried out.
6. The circuit control method according to claim 5, wherein: when the internal cell voltage and the internal temperature of the power battery are qualified, the method further comprises the following steps:
detecting the insulation of the bus;
and when the bus insulation is detected to be qualified, the step of acquiring the total voltage of the power battery is carried out.
7. The circuit control method according to claim 1, wherein: the first preset value is 0.95 times of the total voltage of the power battery.
8. The circuit control method according to claim 1, wherein: the second preset value is 5V smaller than the total voltage of the power battery.
9. A pre-charging circuit after a power battery is powered on is characterized in that: the pre-charging circuit after the power battery is electrified comprises a power battery, a relay group, a voltage conversion unit and a storage battery which are sequentially and electrically connected, wherein the power battery is electrically connected with the voltage conversion unit and a load through the relay group, and the voltage conversion unit is also electrically connected with the storage battery and used for changing the voltage value of the storage battery output end.
10. The pre-charge circuit after power-on of a power battery as claimed in claim 9, wherein: the voltage conversion unit comprises a controller and a DC/DC converter;
the controller and the DC/DC converter are respectively electrically connected with the relay group and the storage battery, and the controller and the DC/DC converter are matched for changing the voltage value of the output end of the storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010667238.5A CN111907353A (en) | 2020-07-10 | 2020-07-10 | Circuit control method and pre-charging circuit after power battery is powered on |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010667238.5A CN111907353A (en) | 2020-07-10 | 2020-07-10 | Circuit control method and pre-charging circuit after power battery is powered on |
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| CN111907353A true CN111907353A (en) | 2020-11-10 |
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| CN202010667238.5A Pending CN111907353A (en) | 2020-07-10 | 2020-07-10 | Circuit control method and pre-charging circuit after power battery is powered on |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114475254A (en) * | 2022-02-22 | 2022-05-13 | 中国第一汽车股份有限公司 | Electric vehicle pre-charging control method and device, storage medium and electronic device |
| CN117977662A (en) * | 2024-03-29 | 2024-05-03 | 杭州协能科技股份有限公司 | Control method of energy storage system |
-
2020
- 2020-07-10 CN CN202010667238.5A patent/CN111907353A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114475254A (en) * | 2022-02-22 | 2022-05-13 | 中国第一汽车股份有限公司 | Electric vehicle pre-charging control method and device, storage medium and electronic device |
| CN114475254B (en) * | 2022-02-22 | 2023-11-14 | 中国第一汽车股份有限公司 | Electric automobile pre-charge control method and device, storage medium and electronic device |
| CN117977662A (en) * | 2024-03-29 | 2024-05-03 | 杭州协能科技股份有限公司 | Control method of energy storage system |
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