CN112693361A - Battery protection system and method - Google Patents

Battery protection system and method Download PDF

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Publication number
CN112693361A
CN112693361A CN202011576275.1A CN202011576275A CN112693361A CN 112693361 A CN112693361 A CN 112693361A CN 202011576275 A CN202011576275 A CN 202011576275A CN 112693361 A CN112693361 A CN 112693361A
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China
Prior art keywords
vehicle
voltage
storage battery
current transformer
mounted storage
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Granted
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CN202011576275.1A
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Chinese (zh)
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CN112693361B (en
Inventor
李可敬
李静静
王维振
张欣
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Priority to CN202011576275.1A priority Critical patent/CN112693361B/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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • 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
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The embodiment of the invention discloses a battery protection method, which comprises the following steps: the vehicle control unit collects voltages at two ends of a large brake switch, wherein one end of the large brake switch is connected with the storage battery, and the other end of the large brake switch is connected with a vehicle-mounted storage battery direct-current transformer; then, the difference value of the voltages at the two ends of the large brake switch is larger, when the difference value of the voltages at the two ends of the large brake switch is larger than a preset threshold value, the condition that the vehicle is abnormally shut down is determined, namely the large brake switch is turned OFF before a key is turned OFF, and aiming at the condition, the vehicle controller controls the storage battery direct current transformer to be powered OFF, so that the power battery is not powered OFF, the energy waste of the vehicle is avoided, and the power battery is protected.

Description

Battery protection system and method
Technical Field
The invention relates to the field of new energy automobiles, in particular to a battery protection system and a battery protection method.
Background
Some new energy automobile include mechanical big floodgate, and under normal conditions, accomplish the vehicle and stop the operation process that moves and include: the driver turns off the key first and then turns off the mechanical brake. However, it often happens that the driver forgets to turn off the key and directly switches off the mechanical brake. And due to the particularity of the electrical principle of the new energy, when the whole vehicle is in a high-voltage state, the vehicle-mounted storage battery direct current transformer DC/DC supplies power to devices such as a whole vehicle controller and the like all the time, and after a large brake of a machine is disconnected, a whole vehicle high-low voltage loop cannot be disconnected, so that the high-low voltage loop works all the time, the electric energy of the vehicle is wasted, the power battery is insufficient, and the normal operation of the vehicle is influenced, and the service life of the battery is shortened.
Disclosure of Invention
In view of this, the embodiment of the present invention discloses a battery protection method, which controls a storage battery dc transformer to power off through a vehicle controller, so that a power battery does not supply power any more, thereby avoiding vehicle energy waste, and also protects the power battery.
Collecting voltages at two ends of a large gate switch, wherein the voltages are respectively a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
calculating a difference of the second voltage minus the first voltage;
and if the difference value obtained by subtracting the first voltage from the second voltage is larger than a preset threshold value, controlling the direct-current transformer of the vehicle-mounted storage battery to be powered off.
Optionally, the controlling the power down of the vehicle-mounted storage battery dc transformer includes:
if the difference value is larger than a preset threshold value, controlling the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer to be powered off;
and after detecting that the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer is powered off, sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer.
Optionally, the method further includes:
if the difference value of subtracting the first voltage from the second voltage is larger than a preset threshold value, detecting whether a key triggers an OFF gear of an ignition switch within preset time;
and if the key is detected to trigger the OFF gear of the ignition switch within the preset time, sending a disconnection enabling signal to the vehicle-mounted storage battery direct current transformer.
Optionally, the method further includes:
and if the key is not detected to trigger the OFF gear of the ignition switch within the preset time, controlling the direct current transformer of the vehicle-mounted storage battery to be powered down.
Optionally, the preset threshold is greater than or equal to zero.
Optionally, the method further includes:
and if the difference value of the second voltage minus the first voltage is greater than a preset threshold value, sending an alarm prompt.
Optionally, the method further includes:
and when detecting that the key triggers the START gear of an ignition switch, sending a wake-up signal to the vehicle-mounted storage battery direct current transformer.
Optionally, the method further includes:
and if the difference value obtained by subtracting the first voltage from the second voltage is not greater than a preset threshold value, the vehicle is in a normal state.
The embodiment of the invention discloses a battery protection system, which comprises:
the vehicle-mounted storage battery direct-current transformer is connected with the vehicle controller;
the input end of the vehicle control unit is connected with two ends of a vehicle large brake switch, wherein the first end of the large brake switch is connected with a storage battery, and the second end of the large brake switch is connected with the output end of a direct-current transformer of the vehicle-mounted storage battery;
the output end of the vehicle control unit is connected with a direct current transformer of the vehicle-mounted storage battery;
the vehicle control unit obtains voltages at two ends of the large brake switch, and controls the direct current transformer of the vehicle-mounted storage battery to be powered off when a difference value obtained by subtracting the voltage at the first end from the voltage at the second end is larger than a preset threshold value.
Optionally, the method further includes:
the relay is respectively connected with the vehicle control unit and the vehicle-mounted storage battery direct-current transformer;
the vehicle control unit is connected with a first input end of the relay, and an input end of the vehicle-mounted storage battery is connected with an output end of the relay;
and the second input end of the relay is connected with the ON gear of the ignition switch.
The embodiment of the invention discloses a battery protection device, which is applied to a vehicle control unit, and the method comprises the following steps:
the voltage acquisition unit is used for acquiring voltages at two ends of the large-gate switch, namely a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
a calculating unit for calculating a difference value of the second voltage minus the first voltage;
and the first power-off control unit is used for controlling the power-off of the direct-current transformer of the vehicle-mounted storage battery if the difference value is greater than a preset threshold value.
The embodiment of the invention discloses a battery protection method, which comprises the following steps: the vehicle control unit collects voltages at two ends of a large brake switch, namely a first voltage at a first end and a second voltage at a second end; the vehicle control device comprises a large brake switch, a vehicle-mounted storage battery direct current transformer, a key, a vehicle controller and a vehicle-mounted storage battery direct current transformer, wherein the first end of the large brake switch is connected with the storage battery, the second end of the large brake switch is connected with the vehicle-mounted storage battery direct current transformer, then whether the difference value of subtracting the first voltage from the second voltage is larger than a preset threshold value or not is judged, when the difference value of subtracting the first voltage from the second voltage is larger than the preset threshold value, the abnormal closing condition of the vehicle is determined, namely the large brake switch is disconnected before the key is not turned OFF, and for the condition, the vehicle controller controls the storage battery direct current transformer to be powered OFF, so that the power battery is.
Furthermore, when the vehicle-mounted storage battery direct current transformer is controlled to be powered off, the vehicle control unit controls the outer high-voltage electrical part of the vehicle-mounted storage battery direct current transformer to be normally powered off, and then sends a disconnection enabling signal to the vehicle-mounted storage battery direct current transformer, so that damage to the electrical part due to on-load power off is avoided, power off of the vehicle is also achieved, energy waste of the vehicle is avoided, and a power battery is protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a battery protection method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a battery protection method according to an embodiment of the present invention;
fig. 3 is another schematic flow chart of a battery protection method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating a battery protection system according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating another structure of a battery protection system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a battery protection device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of a battery protection method according to an embodiment of the present invention is shown, where the method includes:
s101: collecting voltages at two ends of a large gate switch, wherein the voltages are respectively a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
s102: calculating a difference of the second voltage minus the first voltage;
in this embodiment, after the vehicle control unit works, the current state of the vehicle is determined by collecting the voltages at the two ends of the large brake switch.
After the large brake switch is closed, if a difference value obtained by subtracting the first voltage from the second voltage is not greater than a preset threshold value, it indicates that the vehicle is in a normal state, wherein in an ideal state, if the first voltage is equal to the second voltage, it indicates that the vehicle is in a normal state, and as for a result that the first voltage and the second voltage are equal, the following two situations exist:
1) when the key is in the ON gear, the voltage at two ends of the large brake switch collected by the vehicle controller is the voltage of the storage battery, and the first voltage is assumed to be u1The second voltage is u1Then u at this time1＝u1-battery voltage;
2) when a key triggers a START gear of an ignition switch, the vehicle control unit awakens the vehicle-mounted storage battery direct-current transformer to work, the voltage at two ends of a large brake switch acquired by the vehicle control unit is the output voltage of the vehicle-mounted storage battery direct-current transformer, and a first voltage is assumed to be u1The second voltage is u1Then u at this time1＝u1The output voltage of the vehicle-mounted storage battery direct-current transformer is obtained;
in addition, in the case of a normal vehicle shutdown, i.e. with the vehicle key first closed and then the mechanical barrier disengaged:
after the key is off, the vehicle normally runs at a high voltage, the vehicle controller controls the direct-current transformer of the vehicle-mounted storage battery to be powered off, at the moment, the voltage at two ends of the large brake switch collected by the vehicle controller is the voltage at the end of the storage battery, namely, the first voltage is assumed to be u1The second voltage is u1Then u at this time1＝u1-battery voltage;
s103: and if the difference value obtained by subtracting the first voltage from the second voltage is larger than a preset threshold value, controlling the direct-current transformer of the vehicle-mounted storage battery to be powered off.
In this embodiment, if it is detected that the difference between the second voltage and the first voltage is greater than the preset threshold, it indicates that the vehicle is in an abnormal OFF state, that is, before the key does not trigger the OFF-gear of the ignition switch, the large brake switch is turned OFF, and at this time, the power battery is still supplying power to the vehicle through the on-board battery dc transformer.
In order to avoid the waste of electric energy, the power battery is protected, and the vehicle control unit controls the direct-current transformer of the vehicle-mounted storage battery to be powered off under the condition that the difference value obtained by subtracting the first voltage from the second voltage is larger than a preset threshold value.
In the embodiment, the vehicle control unit collects voltages at two ends of a large brake switch, wherein one end of the large brake switch is connected with the storage battery, and the other end of the large brake switch is connected with a vehicle-mounted storage battery direct-current transformer; then, the difference value of the voltages at the two ends of the large brake switch is larger, when the difference value of the voltages at the two ends of the large brake switch is larger than a preset threshold value, the condition that the vehicle is abnormally shut down is determined, namely the large brake switch is turned OFF before a key does not trigger an OFF gear of an ignition switch, and aiming at the condition, the whole vehicle controller controls the storage battery direct current transformer to be powered OFF, so that the power battery is not powered any more, the energy waste of the vehicle is avoided, and the power battery is protected.
Further, in the case of abnormal shutdown of the vehicle, that is, in the case that the large brake switch is turned OFF before the key does not trigger the OFF-range of the ignition switch, at this time, the vehicle-mounted battery dc transformer always supplies power to devices such as a vehicle controller, and after the large brake of the machine is turned OFF, the high-low voltage circuit of the vehicle cannot be turned OFF, so the high-low voltage circuit always works, and if the vehicle-mounted battery dc transformer is directly turned OFF, the situation that the electrical components are powered OFF with loads may possibly occur, and in order to solve the above problem, referring to fig. 2, still another flow diagram of the battery protection method provided by the embodiment of the present invention is shown, and in the embodiment, the method includes:
s201: collecting voltages at two ends of a large gate switch, wherein the voltages are respectively a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
in this embodiment, S201 corresponds to S101 described above, and is not limited in this embodiment.
S202: calculating a difference of the second voltage minus the first voltage;
in this embodiment, S202 is the same as S102 described above, and is not limited in this embodiment.
S203: if the difference value is larger than a preset threshold value, controlling the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer to be powered off;
s204: and after detecting that the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer is powered off, sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer.
In this embodiment, if it is detected that the difference between the second voltage and the first voltage is greater than the preset threshold, it indicates that the vehicle is in an abnormal OFF state, that is, before the key does not trigger the OFF-gear of the ignition switch, the large brake switch is turned OFF, and at this time, the power battery is still supplying power to the vehicle through the on-board battery dc transformer.
At the moment, in order to avoid the power failure of the electric components of the vehicle when the vehicle is loaded, the vehicle control unit controls the external high-voltage electric components of the vehicle-mounted storage battery direct-current transformer to normally work at a high voltage, and after the high voltage is completely worked, the vehicle control unit sends a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer.
In the embodiment, under the condition that the large brake switch is disconnected before the key triggers the OFF gear of the ignition switch, the vehicle controller firstly controls the external high-voltage electrical component of the vehicle-mounted storage battery direct-current transformer to normally realize high voltage, and then sends a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer, so that the damage of the electrical component caused by power-OFF under load is avoided, the power-OFF of the vehicle is realized, the energy waste of the vehicle is avoided, and the power battery is protected.
Further, in some scenarios, the user may disconnect the large brake switch due to an incorrect operation, and after the discovery, a measure for turning OFF the key may be taken, or the user is reminded that the user may also take a measure for turning OFF the key, in which case, if the key is normally turned OFF, after the key is turned OFF, the vehicle may be normally powered OFF, and based on this situation, the embodiment further includes:
if the difference value of subtracting the first voltage from the second voltage is larger than a preset threshold value, detecting whether a key triggers an OFF gear of an ignition switch within preset time;
if the key is detected to trigger an OFF gear of an ignition switch within the preset time, sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer;
and if the key is not detected to trigger the OFF gear of the ignition switch within the preset time, controlling the direct current transformer of the vehicle-mounted storage battery to be powered down. In this embodiment, the preset time may be set according to actual conditions, for example, the preset time may be 60 s.
If the key is detected to trigger the OFF gear of the ignition switch within the preset time, under the condition that the vehicle can normally run at high voltage, the vehicle controller can directly send a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer.
If the key is not detected to trigger the OFF gear of the ignition switch within the preset time, controlling the vehicle-mounted storage battery direct-current transformer to be powered down, and the method comprises the following steps:
controlling the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer to be powered off;
and after detecting that the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer is powered off, sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer.
Furthermore, the vehicle control unit controls the working state of the vehicle-mounted storage battery direct current transformer, can wake up the vehicle-mounted storage battery direct current transformer to work, and can also ensure that the vehicle-mounted storage battery direct current transformer is powered off normally.
The vehicle control unit sends a wake-up signal to the vehicle-mounted storage battery direct current transformer after detecting that a key triggers a START gear of an ignition switch.
Referring to fig. 3, another schematic flow chart of a battery protection method according to an embodiment of the present invention is shown, where the method includes:
s301: collecting voltages at two ends of a large gate switch, wherein the voltages are respectively a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
s302: calculating a difference of the second voltage minus the first voltage;
s303: judging whether the difference value of the second voltage minus the first voltage is greater than a preset threshold value or not;
s304: if the voltage difference value is larger than a preset threshold value, detecting whether a key triggers an OFF gear of an ignition switch within preset time;
s305: if the key is detected to trigger an OFF gear of an ignition switch within the preset time, sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer;
s306: if the key is not detected to trigger an OFF gear of an ignition switch within the preset time, controlling the external high-voltage electric appliance part of the vehicle-mounted storage battery direct-current transformer to be powered OFF, and sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer after the external high-voltage electric appliance part of the vehicle-mounted storage battery direct-current transformer is detected to be powered OFF;
s307: and if the voltage difference is not greater than a preset threshold value, indicating that the vehicle is in a normal state.
In the embodiment, under the condition that the large brake switch is disconnected before the key triggers the OFF gear of the ignition switch, the vehicle controller firstly controls the external high-voltage electrical component of the vehicle-mounted storage battery direct-current transformer to normally realize high voltage, and then sends a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer, so that the damage of the electrical component caused by power-OFF under load is avoided, the power-OFF of the vehicle is realized, the energy waste of the vehicle is avoided, and the power battery is protected.
Referring to fig. 4, a schematic structural diagram of a battery protection system according to an embodiment of the present invention is shown, and in this embodiment, the system includes:
the vehicle control unit 100 and the vehicle-mounted storage battery direct current transformer 200;
the input end of the vehicle control unit 100 is connected with two ends of a vehicle big brake switch; the first end of the large brake switch is connected with a storage battery, and the second end of the large brake switch is connected with the output end of the vehicle-mounted storage battery direct current passing wild device;
the output end of the vehicle control unit 100 is connected with the dc transformer 200 of the vehicle-mounted storage battery;
the vehicle control unit 100 obtains voltages at two ends of the large-brake switch, and controls the direct current transformer of the vehicle-mounted storage battery to power off 200 when a difference value obtained by subtracting the voltage at the first end from the voltage at the second end is larger than a preset threshold value.
In this embodiment, an input end of the vehicle control unit 100 is connected to two ends of the large brake switch, specifically, the two input pins of the vehicle control unit include a first pin and a second pin, the first pin is connected to one end of the large brake switch, and the second pin is connected to the other end of the large brake switch.
According to the connection result, the vehicle control unit can obtain the voltage at two ends of the large brake switch, and the voltage at the first end is assumed to be the first voltage, and the voltage at the second end is assumed to be the second voltage.
The vehicle control unit may periodically acquire the voltage of the first terminal and the voltage of the second terminal, or may acquire the voltage of the first terminal and the voltage of the second terminal in real time.
If the vehicle controller detects that the difference value between the voltage of the first end and the voltage of the first end is larger than the preset threshold value, the vehicle controller can consider that the large brake switch is directly disconnected under the condition that the vehicle key is not closed to the OFF gear. And then the vehicle control unit controls the direct current transformer of the vehicle-mounted storage battery to be powered off.
The preset threshold may be a value greater than or equal to zero.
Wherein, based on the system, the following conditions are also included:
when the big brake switch is closed and the key is positioned at an ON gear, the first voltage is equal to the second voltage, and the first voltage and the second voltage are equal to the voltage at two ends of the storage battery; after the key is started, the vehicle control unit wakes up the vehicle-mounted storage battery direct-current transformer to work, at the moment, the first voltage is equal to the second voltage, and the first voltage and the second voltage are equal to the voltage of the output end of the vehicle-mounted storage battery direct-current transformer. In the above state, the vehicle is in a normal running state.
If the vehicle stops running, if the key is turned OFF firstly and then the mechanical switch is turned OFF, after the key is turned OFF, the vehicle normally runs at a high voltage, the vehicle controller controls the direct-current transformer of the vehicle-mounted storage battery to be powered OFF, and at the moment, the first voltage is equal to the second voltage and is the voltage of the storage battery. In this embodiment, through the connection relationship between the structure and the circuit of the system, the vehicle controller can acquire the voltages at the two ends of the large brake switch, and determine whether the vehicle is abnormally shut down through a larger difference value between the voltages at the two ends of the large brake switch, that is, whether the large brake switch is turned OFF before the key is turned OFF, and when the situation is detected, the vehicle controller controls the direct-current transformer of the storage battery to be powered OFF, so that the power battery is not powered OFF, the energy waste of the vehicle is avoided, and the power battery is protected.
Further, the vehicle control unit and the vehicle-mounted battery dc transformer are connected through a relay, and specifically, referring to fig. 5, another schematic structural diagram of a battery protection system provided in an embodiment of the present invention is shown, including:
the vehicle control unit 100 and the vehicle-mounted storage battery direct current transformer 200;
the input end of the vehicle control unit 100 is connected with two ends of a large brake switch, wherein a first end of the large brake switch is connected with a storage battery, and a second end of the large brake switch is connected with the output end of the direct current transformer 200 of the vehicle-mounted storage battery;
the output end of the vehicle control unit 100 is connected to the input end of the relay 300, the dc transformer 200 of the vehicle-mounted battery is connected to the output end of the relay 300, and the second input end of the relay is connected to the ON position of the ignition switch.
Through the battery protection system, the vehicle control unit 100 controls the dc transformer of the vehicle-mounted storage battery through the relay.
In this embodiment, through the connection relationship between the structure and the circuit of the system, the vehicle controller can acquire the voltages at the two ends of the large brake switch, and determine whether the vehicle is abnormally shut down through a larger difference value between the voltages at the two ends of the large brake switch, that is, whether the large brake switch is turned OFF before the key is turned OFF, and when the situation is detected, the vehicle controller controls the direct-current transformer of the storage battery to be powered OFF, so that the power battery is not powered OFF, the energy waste of the vehicle is avoided, and the power battery is protected.
Referring to fig. 6, a schematic structural diagram of a battery protection device according to an embodiment of the present invention is shown, where the device is applied to a vehicle control unit, and in this embodiment, the device includes:
the voltage acquisition unit 501 is configured to acquire voltages at two ends of the large-gate switch, which are a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
a calculating unit 502, configured to calculate a difference value between the second voltage and the first voltage;
and a first power down control unit 503, configured to control the vehicle-mounted storage battery dc transformer to power down if the difference is greater than a preset threshold.
Optionally, the power-off control unit 502 includes:
the first lower electronic unit is used for controlling the outer high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer to be powered off if the difference value is larger than a preset threshold value;
and the second lower electronic unit is used for sending a disconnection enabling signal to the vehicle-mounted storage battery direct current transformer after detecting that the outer high-voltage electrical appliance part of the vehicle-mounted storage battery direct current transformer is completely powered down.
Optionally, the method further includes:
the detection unit is used for detecting whether the key is in an OFF gear within preset time if the voltage difference value is larger than a preset threshold value;
and the second control power-OFF unit is used for sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer after the vehicle is in high voltage if the key is detected to trigger an OFF gear of an ignition switch within the preset time.
Optionally, the method further includes:
and if the key is not detected to trigger the OFF gear of the ignition switch within the preset time, controlling the direct current transformer of the vehicle-mounted storage battery to be powered down.
Optionally, the preset threshold is greater than or equal to zero.
Optionally, the method further includes:
and if the difference is greater than a preset threshold value, sending an alarm prompt.
Optionally, the method further includes:
and when detecting that the key triggers the START gear of an ignition switch, sending a wake-up signal to the vehicle-mounted storage battery direct current transformer.
Optionally, the method further includes:
and if the difference is not greater than the preset threshold value, the vehicle is in a normal state.
Through the device of this embodiment, gather the voltage at big floodgate switch both ends to than the difference of big floodgate switch both ends voltage, thereby confirm whether the vehicle is in unusual closedown, promptly before the key does not OFF, just disconnected big floodgate switch, under this condition, control battery DC transformer through vehicle control unit and descend the electricity, thereby make power battery no longer supply power, avoided the vehicle energy waste like this, also protected power battery
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A battery protection method is applied to a vehicle control unit, and comprises the following steps:
collecting voltages at two ends of a large gate switch, wherein the voltages are respectively a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
calculating a difference of the second voltage minus the first voltage;
and if the difference value obtained by subtracting the first voltage from the second voltage is larger than a preset threshold value, controlling the direct-current transformer of the vehicle-mounted storage battery to be powered off.
2. The method of claim 1, wherein controlling the on-board battery dc transformer to de-energize comprises:
if the difference value is larger than a preset threshold value, controlling the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer to be powered off;
and after detecting that the external high-voltage electrical appliance part of the vehicle-mounted storage battery direct-current transformer is powered off, sending a disconnection enabling signal to the vehicle-mounted storage battery direct-current transformer.
3. The method of claim 1 or 2, further comprising:
if the difference value of subtracting the first voltage from the second voltage is larger than a preset threshold value, detecting whether a key triggers an OFF gear of an ignition switch within preset time;
and if the key is detected to trigger the OFF gear of the ignition switch within the preset time, sending a disconnection enabling signal to the vehicle-mounted storage battery direct current transformer.
4. The method of claim 3, further comprising:
and if the key is not detected to trigger the OFF gear of the ignition switch within the preset time, controlling the direct current transformer of the vehicle-mounted storage battery to be powered down.
5. The method according to any one of claims 1 to 4, wherein the preset threshold is equal to or greater than zero.
6. The method of claim 1, further comprising:
and if the difference value of the second voltage minus the first voltage is greater than a preset threshold value, sending an alarm prompt.
7. The method of claim 1, further comprising:
and when detecting that the key triggers the START gear of an ignition switch, sending a wake-up signal to the vehicle-mounted storage battery direct current transformer.
8. The method of claim 1, further comprising:
and if the difference value obtained by subtracting the first voltage from the second voltage is not greater than a preset threshold value, the vehicle is in a normal state.
9. A battery protection system, comprising:
the vehicle-mounted storage battery direct-current transformer is connected with the vehicle controller;
the input end of the vehicle control unit is connected with two ends of a vehicle large brake switch, wherein the first end of the large brake switch is connected with a storage battery, and the second end of the large brake switch is connected with the output end of a direct-current transformer of the vehicle-mounted storage battery;
the output end of the vehicle control unit is connected with a direct current transformer of the vehicle-mounted storage battery;
the vehicle control unit obtains voltages at two ends of the large brake switch, and controls the direct current transformer of the vehicle-mounted storage battery to be powered off when a difference value obtained by subtracting the voltage at the first end from the voltage at the second end is larger than a preset threshold value.
10. The method of claim 9, further comprising:
the relay is respectively connected with the vehicle control unit and the vehicle-mounted storage battery direct-current transformer;
the vehicle control unit is connected with a first input end of the relay, and an input end of the vehicle-mounted storage battery is connected with an output end of the relay;
and the second input end of the relay is connected with the ON gear of the ignition switch.
11. A battery protection device is applied to a vehicle control unit, and the method comprises the following steps:
the voltage acquisition unit is used for acquiring voltages at two ends of the large-gate switch, namely a first voltage at a first end and a second voltage at a second end; the first end of the large brake switch is connected with the storage battery, and the second end of the large brake switch is connected with the vehicle-mounted storage battery direct-current transformer;
a calculating unit for calculating a difference value of the second voltage minus the first voltage;
and the first power-off control unit is used for controlling the power-off of the direct-current transformer of the vehicle-mounted storage battery if the difference value is greater than a preset threshold value.
CN202011576275.1A 2020-12-28 2020-12-28 Battery protection system and method Active CN112693361B (en)

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