CN113281662A - Battery state monitoring device and battery pack - Google Patents
Battery state monitoring device and battery pack Download PDFInfo
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- CN113281662A CN113281662A CN202110542726.8A CN202110542726A CN113281662A CN 113281662 A CN113281662 A CN 113281662A CN 202110542726 A CN202110542726 A CN 202110542726A CN 113281662 A CN113281662 A CN 113281662A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention discloses a battery state monitoring device and a battery pack, wherein the device comprises: the system comprises a high-voltage to low-voltage circuit, a power supply selection circuit and a battery management system; the power supply selection circuit is used for conducting a loop between a low-voltage power supply terminal and the battery management system to power on the battery management system when a voltage signal of the low-voltage power supply terminal is detected; the power supply selection circuit is further used for conducting a loop between the high-voltage-to-low-voltage circuit and the battery management system when detecting that no voltage signal exists at the low-voltage power supply terminal, so that the battery management system is powered on; the battery management system is used for collecting battery data of a battery pack during electrification and outputting a fault signal according to the battery data when the battery pack is detected to have a fault according to the battery data, so that the technical problem that the state of the battery pack cannot be monitored in the battery off-line state in the prior art is solved, and the safety of the battery is ensured.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery state monitoring device and a battery pack.
Background
At present, after a high-voltage system of a whole vehicle is powered on, real-time states of an electric vehicle and a battery pack need to be transmitted after real-time data are collected and processed by a battery management system.
After the battery pack is disassembled from the whole vehicle, or the real-time state of the battery pack cannot be monitored in the power-off state of the whole vehicle. Especially pure electric battery can trade the motorcycle type, the battery package that gets off from the vehicle, the time beyond charging can't feed back the inside condition of battery in real time, under the battery off-line state condition, if meet the inside little short circuit of battery package etc. thermal runaway slowly spread and form the thermal diffusion, can't effectively send out the warning in time, easily lead to burning and the ignition fast change station shines into major property loss and personal safety problem.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a battery state monitoring device and a battery pack, and aims to solve the technical problem that the battery state cannot be monitored in the existing battery off-line state.
In order to achieve the above object, the present invention provides a battery state monitoring device and a battery pack, wherein the device comprises: the system comprises a high-voltage to low-voltage circuit, a power supply selection circuit and a battery management system; wherein the content of the first and second substances,
the power supply selection circuit is used for conducting a loop between the low-voltage power supply terminal and the battery management system when detecting that a voltage signal exists at the low-voltage power supply terminal so as to electrify the battery management system;
the power supply selection circuit is further used for conducting a loop between the high-voltage-to-low-voltage circuit and the battery management system when detecting that no voltage signal exists at the low-voltage power supply terminal, so that the battery management system is powered on;
the battery management system is used for collecting battery data of a battery pack during power-on and outputting a fault signal according to the battery data when the battery pack is detected to have a fault according to the battery data.
Optionally, the power selection circuit includes a sampling control chip, a first diode, and a switch circuit, a first end of the first diode is connected to a first input end of the sampling control chip, a second end of the first diode is connected to the battery management system, a first end of the switch circuit is connected to an output end of the sampling control chip, and a second end of the switch circuit is connected to the battery management system; wherein the content of the first and second substances,
the sampling control chip is used for controlling the switch circuit to be switched off when detecting that a voltage signal exists at the low-voltage terminal, the first diode is switched on when the voltage signal exists at the low-voltage terminal, and a loop between the low-voltage terminal and the battery management system is switched on when the first diode is switched on;
the sampling control chip is further used for detecting whether a voltage signal exists in the high-voltage interlocking detection loop when detecting that the voltage signal does not exist in the low-voltage terminal, if so, the switching circuit is controlled to be switched on, the first diode is cut off when the voltage signal does not exist in the low-voltage terminal, and a loop between the high-voltage-to-low-voltage circuit and the battery management system is switched on when the switching circuit is switched on.
Optionally, the switching circuit includes a triode and a second diode, a base of the triode is connected with an output end of the sampling control chip, a source of the triode is connected with the high-voltage to low-voltage circuit, an emitter of the triode is connected with a first end of the second diode, and a second end of the second diode is connected with the battery management system; wherein the content of the first and second substances,
the triode is used for receiving the control signal of sampling control chip output switches on when enabling signal, the second diode is in the triode switches on when switching on, high pressure changes low voltage circuit with return circuit between the battery management system is in the triode with switch on when the second diode switches on.
Optionally, a third input end of the sampling control chip is connected with the high-voltage interlock detection circuit;
the sampling control chip is also used for detecting whether a voltage signal exists in the high-voltage interlocking detection loop when detecting that the voltage signal does not exist in the low-voltage terminal, and if not, the sampling control chip controls the switch circuit to be switched off so as to power down the battery management system.
Optionally, the device further includes an offline warning driving circuit, and the offline warning driving circuit is connected to the output end of the battery management system;
and the offline warning drive circuit is used for driving a warning terminal to send out a warning signal according to the fault signal when receiving the fault signal output by the battery management system.
Optionally, the high-voltage to low-voltage conversion circuit is connected with a second input end of the sampling control chip;
the high-voltage to low-voltage circuit is also used for supplying power to the sampling control chip.
Optionally, the device further comprises a wireless data transmitter connected with the offline warning driving circuit;
and the wireless data transmitter is used for transmitting the early warning signal to terminal equipment when receiving the early warning signal.
Optionally, the high voltage to voltage conversion circuit is connected to a battery high voltage bus.
Optionally, the device further comprises an abnormal indicator light and an abnormal buzzer, the abnormal indicator light is connected with the output end of the off-line warning driving circuit, and the abnormal buzzer is connected with the output end of the off-line warning driving circuit.
In addition, in order to achieve the above object, the present invention further provides a battery pack including the battery state monitoring device as described above
The invention provides a battery state monitoring device, which comprises: the system comprises a high-voltage to low-voltage circuit, a power supply selection circuit and a battery management system; the power supply selection circuit is used for conducting a loop between a low-voltage power supply terminal and the battery management system to power on the battery management system when a voltage signal of the low-voltage power supply terminal is detected; the power supply selection circuit is further used for conducting a loop between the high-voltage-to-low-voltage circuit and the battery management system when detecting that no voltage signal exists at the low-voltage power supply terminal, so that the battery management system is powered on; the battery management system is used for collecting battery data of a battery pack during electrification and outputting a fault signal according to the battery data when the battery pack is detected to have a fault according to the battery data.
Drawings
Fig. 1 is a block diagram showing a first embodiment of a battery state monitoring apparatus according to the present invention;
fig. 2 is a block diagram of a battery state monitoring apparatus according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a block diagram illustrating a first embodiment of a battery status monitoring apparatus according to the present invention.
As shown in fig. 1, the battery state monitoring apparatus may include: a high-to-low voltage circuit 20, a power selection circuit 10 and a battery management system 30.
It is understood that the high-to-low voltage circuit 20 is a circuit that can convert a high voltage to a low voltage that can power the battery management system 30.
It should be understood that the battery management system 30 is a system that can enhance the utilization efficiency of the battery, prevent the battery from being excessively charged and discharged, prolong the service life of the battery, and monitor the state of the battery.
The power selection circuit 10 is configured to, when detecting that a voltage signal exists at a low-voltage power supply terminal, turn on a loop between the low-voltage power supply terminal and the battery management system 30, so as to power up the battery management system 30.
It is understood that the power supply selection circuit 10 has a detection function capable of detecting whether a voltage signal is present at the low voltage power supply terminal in real time.
It can be understood that when the electric vehicle is powered on, a voltage signal exists at the low voltage power supply terminal, and at this time, the battery management system can be powered through the low voltage power supply terminal, and when the power selection circuit 10 detects that a voltage signal exists at the low voltage power supply terminal, a loop between the low voltage power supply terminal and the battery management system 30 is conducted to form a low voltage power supply terminal power supply loop, and the battery management system 30 is powered on to work.
The power selection circuit 10 is further configured to, when detecting that there is no voltage signal at the low-voltage power supply terminal, turn on a loop between the high-voltage to low-voltage circuit 20 and the battery management system 30, so as to power on and operate the battery management system 30.
It is understood that when the electric vehicle is powered down or the battery is detached from the vehicle, the low voltage power supply terminal has no voltage signal and cannot provide power supply for the operation of the battery management system 30.
It should be understood that, in order to ensure that the battery management system 30 can work normally, the power selection circuit 10 indicates that the low voltage power supply terminal cannot provide power for the battery management system when detecting that the low voltage power supply terminal has no voltage signal, and at this time, the power selection circuit 10 conducts a loop between the high voltage to low voltage circuit 20 and the battery management system 30 to enable the battery management system 30 to work electrically.
It will be appreciated that the input of the high to low voltage circuit 20 is connected to the battery high voltage bus and the output of the high to low voltage circuit 20 is connected to the power selection circuit 10.
The battery management system 30 is configured to collect battery data of a battery pack during power-on, and output a fault signal according to the battery data when detecting that a fault occurs in the battery pack according to the battery data.
It can be understood that, when the battery management system 30 is powered on, the battery data of the battery pack can be collected in real time, the collected battery data can be analyzed, and when it is determined that the battery has a fault according to the analysis result, a fault signal is output.
In a specific implementation, for example, when the electric vehicle is powered on, the power selection circuit 10 detects that a voltage signal exists at the low-voltage power supply terminal, and conducts a loop between the low-voltage power supply terminal and the battery management system 30, so that the battery management system is powered on to work; after the electric vehicle is powered off after stopping, the power supply selection circuit 10 detects that no voltage signal exists at the low-voltage power supply terminal, and in order to ensure that the battery management system 30 works normally, a loop between the high-voltage to low-voltage circuit 20 and the battery management system 30 is conducted, and the electric vehicle battery is used for supplying power to the battery management system 30; the electric vehicle is powered off after stopping, the battery is detached, the power selection circuit 10 detects that no voltage signal exists at the first end power supply terminal, in order to ensure that the battery management system 30 works normally, a loop between the high-voltage-to-low-voltage circuit 20 and the battery management system 30 is conducted, the battery is used for supplying power for the battery management system 30, after the battery management system 30 is powered on, the battery state is monitored, battery data are collected, and when the battery is judged to have a fault according to the battery data, a fault signal is output.
Furthermore, in order to timely send out a prompt when the battery fails, the battery state monitoring device further comprises an offline warning driving circuit, and the offline warning driving circuit is connected with the output end of the battery management system.
It can be understood that the input end of the offline warning driving circuit is connected to the output end of the battery management system 30, and when the battery management system 30 outputs a fault signal, the offline warning driving circuit sends a corresponding warning signal according to the fault signal output by the battery management system.
And the offline warning drive circuit is used for driving a warning terminal to send out a warning signal according to the fault signal when receiving the fault signal output by the battery management system.
It is understood that the offline alert driver circuit may send corresponding warning signals according to different types of received fault signals sent by the battery management system 30.
In a specific implementation, for example, the battery management system 30 is powered on to operate, and determines that the battery has a fault according to the collected battery data, at this time, the battery management system 30 outputs a fault signal, an input end of the offline driving warning circuit is connected to an output end of the battery management system 30, and the offline driving warning circuit sends an early warning signal according to the received fault signal when receiving the fault signal sent by the battery management system 30.
Furthermore, in order to enable related workers to know the battery fault information in time, the battery state monitoring device further comprises a wireless data transmitter, and the wireless data transmitter is connected with the offline warning driving circuit.
It can be understood that when the electric vehicle is powered off or the battery is detached, if the battery fails, a worker may be out of the site and cannot timely take care of the failure, which may cause a safety accident.
And the wireless data transmitter is used for transmitting the early warning signal to terminal equipment when receiving the early warning signal.
It can be understood that the input end of the wireless data transmitter is connected to the output end of the offline warning driving circuit, and when the offline warning driving circuit receives the fault signal output by the battery management system 30, the offline warning driving circuit outputs the warning signal to the wireless data transmitter, and the wireless data transmitter transmits the warning signal to the corresponding terminal device.
It should be understood that the received information of the terminal device, which may be an identification number of the terminal device, may be set in the wireless data transmitter in advance, and one or more pieces of information may be set in the wireless data transmitter, which is determined according to the real-time use situation.
In concrete realization, for example, the input of wireless data sender is connected with the output of off-line warning drive circuit, and when off-line warning drive circuit exported the early warning signal, wireless data sender can send the early warning signal to corresponding terminal equipment according to the information that sets up in advance, after terminal equipment received the early warning signal, can in time make the reply according to the early warning signal to avoid appearing the incident.
Furthermore, in order to timely send out a prompt when the battery fails, the device further comprises an abnormal indicator light and an abnormal buzzer, the abnormal indicator light is connected with the output end of the off-line warning driving circuit, and the abnormal buzzer is connected with the output end of the off-line warning driving circuit.
It can be understood that the input end of the abnormal indicator light is connected with the output end of the offline warning driving circuit, and the abnormal indicator light can send out a light prompt according to the early warning signal output by the offline warning driving circuit, the number of the abnormal indicator lights can be one or more, the number of the abnormal indicator lights can be changed or the number of the abnormal indicator lights can be changed according to different fault levels, the abnormal indicator lights can be set according to actual use scenes, and the embodiment does not limit the abnormal indicator lights.
It should be understood that the input end of the abnormal buzzer is connected with the output end of the off-line warning driving circuit, when the early warning signal is received, the abnormal buzzer sends out a buzzing sound prompt, and the strength of the buzzing sound can be adjusted according to different grades.
In specific implementation, for example, an input end of the abnormal buzzer is connected with an output end of the offline warning driving circuit, an input end of the abnormal indicator lamp is connected with an output end of the offline warning driving circuit, when the offline warning driving circuit outputs an early warning signal, a light warning prompt can be sent out for the abnormal indicator lamp, after a preset time, the buzzer sends out a buzzing prompt, the early warning signal is sent to a preset terminal device through the wireless data sender, or when the offline warning driving circuit outputs the early warning signal, the abnormal indicator lamp and the abnormal buzzer send out the warning prompt at the same time, and meanwhile, the early warning signal is sent to a corresponding device through the wireless data sender.
This embodiment proposes a battery condition monitoring device, the device comprising: the system comprises a high-voltage to low-voltage circuit, a power supply selection circuit and a battery management system; the power supply selection circuit is used for conducting a loop between a low-voltage power supply terminal and the battery management system to power on the battery management system when a voltage signal of the low-voltage power supply terminal is detected; the power supply selection circuit is further used for conducting a loop between the high-voltage-to-low-voltage circuit and the battery management system when detecting that no voltage signal exists at the low-voltage power supply terminal, so that the battery management system is powered on; the battery management system is used for collecting battery data of a battery pack during power-on, outputting a fault signal according to the battery data when the battery pack is detected to have a fault according to the battery data.
Referring to fig. 2, a second embodiment of the battery state monitoring device according to the present invention is provided based on the first embodiment.
As shown in fig. 2, in the present embodiment, the power selection circuit 10 includes a sampling control chip 101, a first diode 102, and a switch circuit 103, wherein a first terminal of the first diode 102 is connected to a first input terminal of the sampling control chip 101, a second terminal of the first diode 102 is connected to the battery management system 30, a first terminal of the switch circuit 103 is connected to an output terminal of the sampling control chip 101, and a second terminal of the switch circuit 103 is connected to the battery management system 30; wherein the content of the first and second substances,
the sampling control chip 101 is configured to control the switch circuit 103 to be turned off when detecting that a voltage signal exists at the low-voltage terminal, the first diode 102 is turned on when the voltage signal exists at the low-voltage terminal, and a loop between the low-voltage terminal and the battery management system 30 is turned on when the first diode 102 is turned on.
It can be understood that the first input end of the sampling control chip 101 is connected to the first end of the first diode 102, the first input end of the sampling control chip 101 is further connected to the low-voltage power supply terminal, the sampling control chip 101 can detect whether a voltage signal exists at the low-voltage power supply terminal in real time, when a voltage signal exists at the low-voltage power supply terminal, the output end of the sampling control chip 101 is not enabled, the control switch circuit 103 is turned off, the low-voltage power supply terminal is connected to the first end of the first diode 102 at this time, the first diode 102 is turned on, a loop between the low-voltage power supply terminal and the battery management system 30 is turned on, and the battery management system 30 is powered on to work.
The sampling control chip 101 is further configured to detect whether a voltage signal exists in a high-voltage interlock detection loop when detecting that a voltage signal does not exist at the low-voltage terminal, and if so, control the switching circuit 103 to be turned on, the first diode 102 is turned off when a voltage signal does not exist at the low-voltage terminal, and a loop between the high-voltage to low-voltage circuit 20 and the battery management system 30 is turned on when the switching circuit 103 is turned on.
It can be understood that the high-voltage interlock detection circuit is a circuit for detecting the high-voltage interlock circuit of the maintenance switch, if the high-voltage interlock circuit of the maintenance switch is not disconnected, the high-voltage interlock circuit outputs an effective voltage signal, an output end of the high-voltage interlock detection circuit is connected with a third input end of the sampling control chip 101, if the high-voltage interlock detection circuit outputs an effective voltage signal, an output end of the sampling control chip 101 is enabled, at this time, the first diode 102 is turned off, the switch circuit 103 is turned on, a circuit between the high-voltage to low-voltage circuit 20 and the battery management system 30 is turned on, and the battery management system 30 is powered on to work.
In a specific implementation, for example, when the first input end of the sampling control chip 101 receives a voltage signal of the low-voltage power supply terminal, the control switch circuit 103 is turned off, the first diode 102 is turned on, a loop between the low-voltage power supply terminal and the battery management system 30 is turned on, and the battery management system is powered on to work; when the first input end of the sampling control chip 101 does not receive the voltage signal of the low-voltage power supply terminal and the third power supply terminal receives the voltage signal of the high-voltage interlock detection loop, it indicates that the battery does not enter the maintenance mode, at this time, the output end of the sampling control chip 101 outputs an enable signal, the control switch circuit 103 is turned on, the loop between the high-voltage to low-voltage circuit 20 and the battery management system 30 is turned on, and the battery management system 30 is powered on to work.
Further, in order to accurately control the conduction of the loop between the high voltage to low voltage circuit and the battery management system, referring to fig. 2, the switching circuit 103 includes a transistor 1031 and a second diode 1032, a base of the transistor 1031 is connected to the output terminal of the sampling control chip 101, a source of the transistor 1031 is connected to the high voltage to low voltage circuit 20, an emitter of the transistor 1031 is connected to a first end of the second diode 1032, and a second end of the second diode 1032 is connected to the battery management system 30; wherein the content of the first and second substances,
the triode 1031 is configured to be turned on when receiving the control signal output by the sampling control chip 101 as an enable signal, the second diode 1032 is turned on when the triode 1031 is turned on, and a loop between the high-voltage to low-voltage conversion circuit 20 and the battery management system 30 is turned on when the triode 1031 and the second diode 1032 are turned on.
It can be understood that the base of the transistor 1031 is connected to the output terminal of the sampling control chip 101, when the output terminal of the sampling control chip outputs the enable signal, the base of the transistor 1031 is applied with a conducting voltage, after the transistor 1031 is conducted, the second diode 1032 is conducted in the forward direction, at this time, the loop between the high-voltage to low-voltage circuit 20 and the battery management system 30 is conducted, and the battery management system 30 is powered on to work.
In a specific implementation, for example, the sampling control chip 101 outputs an enable signal, a base of the transistor 1031 receives a turn-on voltage, the transistor 1031 is turned on, a forward voltage is generated across the second diode 1032, the second diode 1032 is turned on, a loop between the high-voltage to low-voltage circuit 20 and the battery management system 30 is turned on at this time, the battery management system 30 is powered on to operate, and when the battery management system 30 is powered on to operate, the first diode 102 is turned off, so that when the high-voltage to low-voltage circuit 20 is used for supplying power to the battery management system 30, current is prevented from flowing back to the loop between the low-voltage power supply terminal and the battery management system 30, which may cause hardware damage.
Further, in order to avoid hardware damage caused by the work of a battery management system in a battery unpacking and maintaining state, the third input end of the sampling control chip 101 is connected with a high-voltage interlocking detection loop;
the sampling control chip 101 is further configured to detect whether a voltage signal exists in the high-voltage interlock detection circuit when detecting that a voltage signal does not exist at the low-voltage terminal, and if not, control the switch circuit to be turned off to power down the battery management system.
It can be understood that when the first input terminal of the sampling control chip 101 does not have the voltage signal of the voltage power supply terminal, it indicates that the electric vehicle is powered off or the battery pack is detached, and when the third input terminal of the sampling control chip does not have the input voltage of the high-voltage interlock detection circuit, it indicates that the battery is in the maintenance state, at this time, the output terminal of the sampling control chip 101 is not enabled, the switch circuit 103 is disconnected, and the battery management system 30 is not powered on to operate.
In a specific implementation, for example, there is no voltage signal at the first input end of the sampling control chip 101, the battery is unpacked for maintenance, the high-voltage interlock circuit is disconnected, at this time, there is no output voltage signal at the high-voltage interlock detection loop, there is no input voltage signal at the third input end of the sampling control chip 101, it can be determined that the battery enters the maintenance mode, the output end of the sampling control chip 101 is disabled, the switch circuit 103 is disconnected, at this time, because neither the loop between the low-voltage power supply terminal and the battery management system 30 nor the loop between the high-voltage to low-voltage circuit 20 and the battery management system 30 is turned on, at this time, the battery management system 30 is not powered on for operation, and it can be effectively avoided that the battery is damaged due to the operation of the battery management system 30 in the unpacking maintenance state.
Further, in order to ensure that the sampling control chip works normally, the high-voltage to low-voltage conversion circuit is connected with a second input end of the sampling control chip;
the high-voltage to low-voltage circuit is also used for supplying power to the sampling control chip.
It can be understood that the output terminal of the high-voltage to low-voltage circuit 20 is further connected to the second input terminal of the sampling control chip 101, i.e. the power supply terminal of the sampling control chip 101, for supplying power for normal operation thereof.
The power supply selection circuit of the embodiment comprises a sampling control chip, a first diode and a switch circuit, wherein a first end of the first diode is connected with a first input end of the sampling control chip, a second end of the first diode is connected with the battery management system, a first end of the switch circuit is connected with an output end of the sampling control chip, and a second end of the switch circuit is connected with the battery management system; the sampling control chip is used for controlling the switch circuit to be switched off when detecting that a voltage signal exists at the low-voltage terminal, the first diode is switched on when the voltage signal exists at the low-voltage terminal, and a loop between the low-voltage terminal and the battery management system is switched on when the first diode is switched on; the sampling control chip is further used for detecting whether a voltage signal exists in a high-voltage interlocking detection loop when detecting that the voltage signal does not exist in the low-voltage terminal, if so, the switching circuit is controlled to be switched on, the first diode is cut off when the voltage signal does not exist in the low-voltage terminal, and a loop between the high-voltage-to-low-voltage circuit and the battery management system is switched on when the switching circuit is switched on; when the low-voltage power supply terminal has a voltage signal, the output end of the sampling control chip is not enabled, the control switch circuit is disconnected, and a loop between the low-voltage power supply terminal and the battery management system is conducted; when the low-voltage power supply terminal has no voltage signal, if the high-voltage interlocking detection circuit has the voltage signal, the switch circuit is controlled to be switched on, the circuit between the high-voltage to low-voltage circuit and the battery management system is switched on, and if the high-voltage interlocking detection circuit has no voltage signal, the switch circuit is controlled to be switched off, and the battery management system is powered off, so that the technical problem that hardware is damaged due to the fact that the battery management system works in the state of unpacking and maintaining of the battery in the prior art is solved, and the safety of the hardware is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A battery condition monitoring device, the device comprising: the system comprises a high-voltage to low-voltage circuit, a power supply selection circuit and a battery management system; wherein the content of the first and second substances,
the power supply selection circuit is used for conducting a loop between the low-voltage power supply terminal and the battery management system when detecting that a voltage signal exists at the low-voltage power supply terminal so as to electrify the battery management system;
the power supply selection circuit is further used for conducting a loop between the high-voltage-to-low-voltage circuit and the battery management system when detecting that no voltage signal exists at the low-voltage power supply terminal, so that the battery management system is powered on;
the battery management system is used for collecting battery data of a battery pack during power-on and outputting a fault signal according to the battery data when the battery pack is detected to have a fault according to the battery data.
2. The apparatus of claim 1, wherein the power selection circuit comprises a sampling control chip, a first diode, and a switch circuit, a first terminal of the first diode being connected to a first input terminal of the sampling control chip, a second terminal of the first diode being connected to the battery management system, a first terminal of the switch circuit being connected to an output terminal of the sampling control chip, a second terminal of the switch circuit being connected to the battery management system; wherein the content of the first and second substances,
the sampling control chip is used for controlling the switch circuit to be switched off when detecting that a voltage signal exists at the low-voltage terminal, the first diode is switched on when the voltage signal exists at the low-voltage terminal, and a loop between the low-voltage terminal and the battery management system is switched on when the first diode is switched on;
the sampling control chip is further used for detecting whether a voltage signal exists in the high-voltage interlocking detection loop when detecting that the voltage signal does not exist in the low-voltage terminal, if so, the switching circuit is controlled to be switched on, the first diode is cut off when the voltage signal does not exist in the low-voltage terminal, and a loop between the high-voltage-to-low-voltage circuit and the battery management system is switched on when the switching circuit is switched on.
3. The method of claim 2, wherein the switching circuit comprises a transistor and a second diode, a base of the transistor is connected to the output terminal of the sampling control chip, a source of the transistor is connected to the high-to-low voltage circuit, an emitter of the transistor is connected to a first terminal of the second diode, and a second terminal of the second diode is connected to the battery management system; wherein the content of the first and second substances,
the triode is used for receiving the control signal of sampling control chip output switches on when enabling signal, the second diode is in the triode switches on when switching on, high pressure changes low voltage circuit with return circuit between the battery management system is in the triode with switch on when the second diode switches on.
4. The apparatus of claim 2, wherein a third input of the sampling control chip is connected to a high voltage interlock detection loop;
the sampling control chip is also used for detecting whether a voltage signal exists in the high-voltage interlocking detection loop when detecting that the voltage signal does not exist in the low-voltage terminal, and if not, the sampling control chip controls the switch circuit to be switched off so as to power down the battery management system.
5. The apparatus of any of claims 1 to 4, further comprising an offline alert driver circuit, the offline alert driver circuit coupled to an output of the battery management system;
and the offline warning drive circuit is used for driving a warning terminal to send out a warning signal according to the fault signal when receiving the fault signal output by the battery management system.
6. The device of any one of claims 2 to 4, wherein the high-voltage to low-voltage circuit is connected with the second input end of the sampling control chip;
the high-voltage to low-voltage circuit is also used for supplying power to the sampling control chip.
7. The apparatus of claim 5, further comprising a wireless data transmitter coupled to the offline alert driver circuit;
and the wireless data transmitter is used for transmitting the early warning signal to terminal equipment when receiving the early warning signal.
8. The apparatus of claim 7, wherein the high voltage to voltage circuit is connected to a battery high voltage bus.
9. The apparatus of claim 7, further comprising an abnormality indicator connected to an output of the off-line alarm driving circuit and an abnormality buzzer connected to an output of the off-line alarm driving circuit.
10. A battery pack characterized in that the battery pack comprises the battery state monitoring device according to any one of claims 1 to 9.
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