CN114690042A - Power battery safety monitoring device and vehicle - Google Patents
Power battery safety monitoring device and vehicle Download PDFInfo
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- CN114690042A CN114690042A CN202011618960.6A CN202011618960A CN114690042A CN 114690042 A CN114690042 A CN 114690042A CN 202011618960 A CN202011618960 A CN 202011618960A CN 114690042 A CN114690042 A CN 114690042A
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- G01—MEASURING; TESTING
- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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Abstract
The disclosure relates to a power battery safety monitoring device and a vehicle, which are used for improving the safety of a power battery of the vehicle. The power battery safety monitoring device comprises a power supply, a thermal runaway monitoring circuit, a signal processing circuit and a battery controller; the thermal runaway monitoring circuit is connected with the power supply and comprises a safety valve connecting line connected in series, and the safety valve connecting line is disconnected when a safety valve of the power battery is opened; the signal processing circuit is used for outputting a wake-up signal to the battery controller when the safety valve connecting line is disconnected; the battery controller is used for collecting electrical parameter information of the safety valve connecting circuit when the wake-up signal is detected, and determining whether the power battery is out of control due to heat according to the electrical parameter information.
Description
Technical Field
The disclosure relates to the technical field of vehicle safety, in particular to a power battery safety monitoring device and a vehicle.
Background
With the development of battery technology, more and more vehicles begin to use electric energy as the energy source of automobiles, and at the same time, power battery safety is an important consideration. Under normal conditions, the generated heat does not affect the safety of the vehicle, but under abnormal conditions, such as collision, overcharge, internal short circuit and the like, the heat generated by the power battery can cause thermal runaway, and under the thermal runaway, the power battery can generate irreversible chemical reaction to generate a large amount of combustible toxic smoke, so that dangerous conditions such as combustion and explosion are caused, and the safety of the power battery, the vehicle and drivers and passengers is threatened.
At present, most of power battery thermal runaway monitoring methods are simple in form and single in mode, for example, monitoring is performed through sound or temperature, the monitoring is not accurate enough, and the monitoring method has great limitation. In addition, the state of the battery is presumed only by monitoring the current, the voltage and the temperature by the battery management system, and particularly, related information cannot be obtained in time at the early stage of thermal runaway, so that the time for drivers and passengers to safely evacuate is reduced, and sufficient safety cannot be ensured.
Disclosure of Invention
The purpose of the present disclosure is to provide a power battery safety monitoring device and a vehicle, so as to improve the safety of a power battery of the vehicle.
In order to achieve the above object, according to a first aspect of the present disclosure, there is provided a power battery safety monitoring device, including a power supply, a thermal runaway monitoring circuit, a signal processing circuit, and a battery controller;
the thermal runaway monitoring circuit is connected with the power supply and comprises a safety valve connecting line connected in series, and the safety valve connecting line is disconnected when a safety valve of the power battery is opened;
the signal processing circuit is used for outputting a wake-up signal to the battery controller when the safety valve connecting line is disconnected;
the battery controller is used for collecting electrical parameter information of the safety valve connecting circuit when the wake-up signal is detected, and determining whether the power battery is out of control due to heat according to the electrical parameter information.
Optionally, the thermal runaway monitoring circuit comprises a first resistor, the safety valve connection line and a second resistor connected in series in this order;
one end of the first resistor is connected with the power supply, and the other end of the first resistor is connected with the input end of the safety valve connecting circuit;
the input end of the safety valve connecting circuit is electrically connected with a metal shell of a safety valve on the 1 st cell in the power battery, the metal shell of the Nth cell in the power battery is electrically connected with the metal shell of the safety valve on the (N +1) th cell in the power battery, and the metal shell of the Mth cell in the power battery is electrically connected with the output end of the safety valve connecting circuit, wherein the power battery comprises M cells in total, and N is more than or equal to 1 and less than or equal to M-1;
the first end of the second resistor is connected with the output end of the safety valve connecting circuit, and the second end of the second resistor is grounded.
Optionally, the signal processing circuit comprises a first signal processing branch and a second signal processing branch;
the first signal processing branch is disconnected when the safety valve connecting line is switched on and is switched on when the safety valve connecting line is switched off;
the second signal processing branch circuit is conducted when the first signal processing branch circuit is conducted, and the second signal processing branch circuit outputs the wake-up signal in a conducting state.
Optionally, the first signal processing branch includes a third resistor, a first N-type MOS transistor, a fourth resistor, and a fifth resistor, one end of the third resistor is connected to the first end of the second resistor, the other end of the third resistor is connected to the gate of the first N-type MOS transistor, one end of the fourth resistor is connected to the power supply, the other end of the fourth resistor is connected to the drain of the first N-type MOS transistor, one end of the fifth resistor is connected to the source of the first N-type MOS transistor, and the other end of the fifth resistor is grounded;
the second signal processing branch circuit comprises a sixth resistor, a second N-type MOS (metal oxide semiconductor) tube and a seventh resistor, one end of the sixth resistor is connected with the drain electrode of the first N-type MOS tube, the other end of the sixth resistor is connected with the grid electrode of the second N-type MOS tube, one end of the seventh resistor is connected with the source electrode of the second N-type MOS tube, the other end of the seventh resistor is grounded, the drain electrode of the second N-type MOS tube is connected with the power supply, and the second signal processing branch circuit outputs the awakening signal at the connection position of the seventh resistor and the source electrode of the second N-type MOS tube.
Optionally, the device further includes a self-detection trigger circuit, configured to perform self-detection on the power battery safety monitoring device to determine whether the power battery safety monitoring device can operate normally;
the self-detection trigger circuit comprises a P-type MOS tube, the grid electrode of the P-type MOS tube is connected with the battery controller, the drain electrode of the P-type MOS tube is connected with the input end of the safety valve connecting circuit, and the source electrode of the P-type MOS tube is grounded;
the battery controller is also used for sending a high-level signal to the grid electrode of the P-type MOS tube so as to trigger the self-detection of the power battery safety monitoring device.
Optionally, the battery controller includes an electrical parameter collecting component, the electrical parameter collecting component is connected to the output end of the safety valve connection line, and the battery controller is configured to collect electrical parameter information of the safety valve connection line through the electrical parameter collecting component.
Optionally, the battery controller is configured to, when the wake-up signal is detected, acquire, by the electrical parameter acquisition component, electrical parameter information of the safety valve connection line as first electrical parameter information according to a first acquisition frequency, and determine whether thermal runaway occurs in the power battery according to the first electrical parameter information, where the first acquisition frequency is greater than a preset frequency.
Optionally, the battery controller is configured to, when the wake-up signal is not detected, acquire, by the electrical parameter acquisition component, electrical parameter information of the safety valve connection line as second electrical parameter information according to a second acquisition frequency, and determine whether each device in the thermal runaway monitoring circuit is abnormal according to the second electrical parameter information, where the second acquisition frequency is less than a preset frequency.
Optionally, the battery controller stores a parameter upper limit value and a parameter lower limit value;
the battery controller further comprises an abnormality identification component, wherein the abnormality identification component is used for confirming the abnormality type of the power battery when the parameter value indicated by the second electrical parameter information is determined to be larger than the parameter upper limit value or smaller than the parameter lower limit value; and the number of the first and second groups,
the power battery safety monitoring device further comprises a prompt component, and the prompt component is used for outputting prompt information according to the abnormal type identified by the abnormal identification component.
According to a second aspect of the present disclosure, a vehicle is provided, which includes the power battery safety monitoring device of the first aspect of the present disclosure.
Through the technical scheme, power battery safety monitoring device includes the power, thermal runaway monitoring circuit, signal processing circuit and battery controller, wherein, thermal runaway monitoring circuit connects the power, and, thermal runaway monitoring circuit includes the relief valve interconnecting link of series connection access, this relief valve interconnecting link breaks when power battery's relief valve opens, signal processing circuit is used for exporting the awakening signal to battery controller when relief valve interconnecting link breaks, battery controller is used for gathering the electrical parameter information of relief valve interconnecting link when detecting the awakening signal, and whether power battery takes place thermal runaway according to electrical parameter information determination. From this, the on-off through relief valve interconnecting link reflects the open mode of power battery relief valve, can in time detect this condition when power battery's relief valve is opened to, can confirm power battery whether take place the thermal runaway more quickly, just can in time detect at the initial stage that the thermal runaway takes place, be favorable to making the early warning faster and in time take safeguard procedures, strive for more time for driver and crew.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:
fig. 1 is a schematic view of a cell casing with a safety valve open;
fig. 2 is a schematic view of the cell casing after installation of the safety valve;
FIG. 3 is a block diagram of a power cell safety monitoring device provided in accordance with one embodiment of the present disclosure;
FIG. 4 is a schematic circuit diagram of a power cell safety monitoring device provided in accordance with an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a safety valve connection line in the power battery safety monitoring device of the present disclosure;
FIG. 6 is a block diagram of a vehicle provided in accordance with one embodiment of the present disclosure.
Description of the reference numerals
Power supply 110 of power battery safety monitoring device 100
Thermal runaway monitoring circuit 120 signal processing circuit 130
First resistor R1 and second resistor R2
Safety valve connection line input A1 safety valve connection line output A2
First signal processing branch 131 and second signal processing branch 132
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before describing the aspects of the present disclosure, a brief description will be given of the devices involved in the aspects of the present disclosure.
The power battery is composed of a plurality of small batteries, each of which may also be referred to as a battery cell, that is, the power battery is composed of a plurality of battery cells, wherein electrodes between the battery cells are connected together in series and/or parallel to meet the voltage, discharge current, capacity and the like of the power battery required by the vehicle. The shell of the battery core is of a sealed metal structure so as to isolate the battery material inside the battery core from the outside air.
In the process of designing and manufacturing the power battery, for the battery cells, in order to avoid explosion of the sealed metal shell of the battery cells, a safety valve is configured for each battery cell to serve as an explosion-proof barrier. Therefore, there is bellied safety valve mouth in one side of electric core metal casing, can be for the battery filling electrolyte through the safety valve mouth, the safety valve mouth is close to the electric core side and is provided with the recess to can form fixedly and install at the draw-in groove position after the safety valve lid installation, and be provided with sealed the pad in the safety valve lid, so that after the safety valve lid installation, can form complete sealedly through the sealing pad. Because the relief valve is also the metal material, safety valve cap installation back, can form the metal contact between the metal casing of safety valve cap and electric core, electrically conductive effect has, so after the relief valve installation is accomplished, can fully be connected with the metal casing of electric core, thereby good electrically conductive effect has, and simultaneously, when electric core inside produced gas, gas can produce the high pressure in inclosed metal casing, the relief valve can open when receiving pressure promotion, release the inside high atmospheric pressure of metal casing, in order to avoid taking place more serious explosion, and, can not recover after the relief valve is opened, power battery is useless. Fig. 1 is a schematic diagram of a cell casing when a safety valve is opened, and fig. 2 is a schematic diagram of the cell casing after the safety valve is installed, where B1 is the cell casing, B2 indicates a clamping groove position, B3 is a safety valve cover, and B4 is a sealing gasket of the safety valve.
Fig. 3 is a block diagram of a power battery safety monitoring device provided according to an embodiment of the present disclosure. As shown in fig. 1, the power battery safety monitoring device 100 includes a power source 110, a thermal runaway monitoring circuit 120, a signal processing circuit 130, and a battery controller 140. The power supply 110 is used to provide power for the power battery safety monitoring device 100, for example, to provide power for the thermal runaway monitoring circuit 120 and the signal processing circuit 130.
The thermal runaway monitoring circuit 120 is connected to the power source 110, and the thermal runaway monitoring circuit 120 includes a safety valve connection line 121 connected in series, and the safety valve connection line 121 is opened when a safety valve of the power battery is opened.
The signal processing circuit 130 is configured to output a wake-up signal to the battery controller 140 when the safety valve connection line 121 is disconnected.
The battery controller 140 is configured to collect electrical parameter information of the safety valve connection line 121 when the wake-up signal is detected, and determine whether thermal runaway occurs in the power battery according to the electrical parameter information.
Among them, the Battery controller 140 may be a Battery Management System (BMS).
Alternatively, as shown in fig. 4, the thermal runaway monitoring circuit 120 may include a first resistor R1, a safety valve connection line 121, and a second resistor R2 connected in series in that order.
One end of the first resistor R1 is connected to the power source 110, and the other end of the first resistor R1 is connected to the input terminal a1 of the safety valve connection line 121. The first end of the second resistor R2 is connected to the output terminal a2 of the safety valve connection line 121, and the second end of the second resistor R2 is grounded. The first resistor R1 and the second resistor R2 are used for voltage division in the thermal runaway monitoring circuit 120.
As described above, the safety valve connection line 121 is disconnected when the safety valves of the power battery are opened, and this can be achieved by connecting the respective safety valves of the power battery in series in order.
In a possible embodiment, if the power battery includes M cells in total, the input end a1 of the safety valve connection line 121 is electrically connected to the metal casing of the safety valve on the 1 st cell in the power battery, the metal casing of the nth cell in the power battery is electrically connected to the metal casing of the safety valve on the (N +1) th cell in the power battery, and the metal casing of the mth cell in the power battery is electrically connected to the output end a2 of the safety valve connection line 121. Wherein N is more than or equal to 1 and less than or equal to M-1, and M, N are positive integers.
Like this, be equivalent to connect the safety valve of electricity core casing and next section electricity core with the wire, formed the safety valve in proper order, the electrically conductive return circuit of electricity core casing, relief valve, electricity core casing (follow-up omission), and connect in thermal runaway monitoring circuit, if any one of them safety valve is opened, above-mentioned return circuit disconnection, relief valve interconnecting link is the disconnection promptly, consequently, through relief valve interconnecting link's connected state, can reflect fast, directly whether there is the condition that the relief valve opened. The connected wires may be directly welded, or may be crimped with bolts, or may be riveted, which is not limited in this disclosure. For example, the safety valve connection line may be as shown in fig. 5.
In this way, the safety valves are connected in series, the opening of the safety valves can be monitored more quickly, and meanwhile, stable electric signals are used for monitoring, compared with a temperature monitoring mode (the temperature is required to be obviously changed to sense the abnormity, or the monitoring is easy to make mistakes when the overall temperature of the power battery is higher) and a sound monitoring mode (the safety valves can not be monitored to be opened in time, or the monitoring is made mistakes due to the fact that other sound signals are received), faults can be monitored in time at the initial stage of the opening of the safety valves, earlier early warning time can be obtained, corresponding measures can be taken by related personnel conveniently, and meanwhile, the stable electric signals are utilized, and the monitoring accuracy is also guaranteed. In addition, the safety valves are connected in series, so that a sensor is not required to be additionally arranged, the weight is reduced, and the cost is reduced.
Optionally, the signal processing circuit 130 may comprise a first signal processing branch 131 and a second signal processing branch 132. Wherein the first signal processing branch 131 is turned off when the safety valve connection line 121 is turned on, and is turned on when the safety valve connection line 121 is turned off. The second signal processing branch 132 is turned on when the first signal processing branch 131 is turned on, and the second signal processing branch 132 outputs the wake-up signal in a turned-on state. That is, when the safety valve connection line 121 is turned on, the first signal processing branch 131 is turned off, and the second signal processing branch 132 is also turned off, that is, if the thermal runaway of the power battery does not occur, the safety valves of the power battery are not opened, and at this time, the signal processing circuit 130 does not work. The on/off of the signal processing circuit can be controlled by a Metal Oxide Semiconductor Field Effect Transistor (MOSFET).
For example, as shown in fig. 4, the first signal processing branch 131 may include a third resistor R3, a first N-type MOS transistor S1, a fourth resistor R4, and a fifth resistor R5, wherein one end of the third resistor R3 is connected to the first end of the second resistor R2, the other end of the third resistor R3 is connected to the gate of the first N-type MOS transistor S1, one end of the fourth resistor R4 is connected to the power supply 110, the other end of the fourth resistor R4 is connected to the drain of the first N-type MOS transistor S1, one end of the fifth resistor R5 is connected to the source of the first N-type MOS transistor S1, and the other end of the fifth resistor R5 is grounded.
In the circuit shown in fig. 4, if the safety valve connection line 121 is disconnected, the output terminal a2 of the safety valve connection line 121 outputs a low level signal (voltage signal), so that the signal entering the first signal processing branch 131 is also a low level signal, and the first N-type MOS transistor S1 is turned on after receiving the low level signal, so that the first signal processing branch 131 is turned on. Conversely, if the safety valve connection line 121 is turned on, the output terminal a2 of the safety valve connection line 121 outputs a high level signal (voltage signal), which results in that the signal entering the first signal processing branch 131 is also a high level signal, and the first N-type MOS transistor S1 is turned off (non-conductive) after receiving the high level signal, so that the first signal processing branch 131 is turned off (non-operational).
Illustratively, as shown in fig. 4, the second signal processing branch 132 includes a sixth resistor R6, a second N-type MOS transistor S2 and a seventh resistor R7, one end of the sixth resistor R6 is connected to the drain of the first N-type MOS transistor S1, the other end of the sixth resistor R6 is connected to the gate of the second N-type MOS transistor S2, one end of the seventh resistor R7 is connected to the source of the second N-type MOS transistor S2, the other end of the seventh resistor R7 is grounded, the drain of the second N-type MOS transistor S2 is connected to the power supply 110, and the second signal processing branch 132 outputs the wake-up signal at a connection K between the seventh resistor R7 and the source of the second N-type MOS transistor S2.
In the circuit shown in fig. 4, if the safety valve connection line 121 is disconnected, the first signal processing branch 131 is turned on, so that the signal entering the second signal processing branch 132 is a low level signal, the second N-type MOS transistor S2 is turned on at a low level, so that the second signal processing branch 132 is turned on, and the connection K between the seventh resistor R7 and the source of the second N-type MOS transistor S2 is at a high level at this time, so that the second signal processing branch 132 outputs a high level wake-up signal (or the battery controller 140 may actively collect the wake-up signal at the connection K). Conversely, if the safety valve connection line 121 is turned on, the first signal processing branch 131 is turned off, and the second signal processing branch 132 is also turned off, and at this time, if the signal at K is acquired, only the low level signal can be acquired.
In practice, the signal processing circuit 130 is used for amplifying a signal, wherein the first signal processing branch 131 is responsible for a first stage of amplification, and the second signal processing branch 132 is responsible for a second stage of amplification, so as to output a larger wake-up signal.
Optionally, the battery controller 140 may include an electrical parameter acquisition component, which may be connected to the output a2 of the safety valve connection line 121, through which the battery controller 140 is configured to acquire electrical parameter information of the safety valve connection line 121. For example, a collection point may be provided at the position AD1 in fig. 4, and the battery controller 140 may collect the electrical parameter at the collection point AD1 through the electrical parameter collection component to obtain the electrical parameter information of the safety valve connection line 121. For example, the electrical parameter information may be a voltage signal, or may also be a current signal, etc.
The battery controller 140 may be configured to acquire, as the first electrical parameter information, electrical parameter information of the safety valve connection line 121 through the electrical parameter acquisition component at a first acquisition frequency when the wake-up signal is detected, and determine whether thermal runaway occurs in the power battery according to the first electrical parameter information.
The first collection frequency is greater than the preset frequency, that is, the first collection frequency can be set higher, so as to realize high-frequency collection of the electrical parameter information. If the battery controller 140 detects the wake-up signal, it indicates that the safety valve may be opened, and therefore, a higher frequency of information acquisition is required at this time to determine whether the safety valve is actually opened, so as to more quickly monitor the thermal runaway of the power battery.
When determining whether the thermal runaway occurs in the power battery according to the first electrical parameter information, it may be determined whether the collected first electrical parameter information (e.g., the electrical parameter information collected at AD1 in fig. 4) is a low level signal, and if the collected first electrical parameter information is determined to be a low level signal, it indicates that the safety valve connection line 121 is disconnected (there is an open safety valve), so that it may be determined that the thermal runaway occurs in the power battery. In addition, in order to more accurately determine the thermal runaway, the first electrical parameter information can be collected as much as possible, the judgment is carried out for multiple times, and when the low level signal is confirmed to be collected for multiple times (the times can be preset), the thermal runaway of the power battery can be confirmed.
Optionally, the battery controller 140 is configured to acquire, by the electrical parameter acquisition component, electrical parameter information of the safety valve connection line as second electrical parameter information at a second acquisition frequency when the wake-up signal is not detected, and determine whether there is an abnormality in each device in the thermal runaway monitoring circuit 120 according to the second electrical parameter information.
In the arranged safety monitoring device for the power battery, if all devices and the connection relation among the devices are normal, the acquired electrical parameter information is stable, so that the situation that the electrical parameter is abnormal can exist as long as the situation that the electrical parameter is too high or too low occurs. Therefore, a parameter upper limit value and a parameter lower limit value for defining a range of the normal electrical parameter may be set in advance. Therefore, if the parameter value indicated by the collected second electrical parameter information exceeds the upper limit value of the parameter, or is lower than the lower limit value of the parameter, it indicates that there may be an abnormality in the device in the thermal runaway monitoring circuit 120. Meanwhile, the battery controller 140 may further include an abnormality recognition component for confirming the type of abnormality of the power battery, that is, what kind of abnormality the power battery has at all times, when it is determined that the parameter value indicated by the second electrical parameter information is greater than the parameter upper limit value or less than the parameter lower limit value.
Furthermore, the power battery safety monitoring device 100 may further include a prompt component for outputting prompt information according to the abnormality type identified by the abnormality identification component.
For example, if the second electrical parameter information acquired multiple times is higher than the preset upper limit value of the parameter, the abnormality identification component may further acquire temperature information and/or voltage information of the battery cell to determine whether the temperature and/or voltage of the battery cell is normal, and if the temperature information and/or voltage information of the battery cell is abnormal, it indicates that there may be an electrical leakage abnormality inside the battery cell. The prompting component can output corresponding prompting information (for example, output through an instrument, output through a sound playing device, and the like) at the moment so as to prompt circuit maintenance of the power battery safety monitoring device.
For another example, if the second electrical parameter information acquired for multiple times is lower than the preset parameter lower limit value, the abnormality identification component may further acquire the relevant electrical parameter of the safety valve connection line 121, and calculate the resistance of the safety valve, and if it is determined that the resistance of the safety valve increases, it indicates that corrosion may occur at the connection of the safety valve. The prompting component can output corresponding prompting information (for example, output through an instrument, output through a sound playing device, and the like) at the moment so as to prompt circuit maintenance of the power battery safety monitoring device.
For another example, assuming that the second electrical parameter information is a voltage signal, if the second electrical parameter information acquired for multiple times is lower than a preset parameter lower limit value, the anomaly identification component may record the duration of the condition, and if the duration of the condition that the second electrical parameter information is lower than the parameter lower limit value reaches a preset duration, it may be that a battery cell inside the power battery is crystallized on a negative electrode to cause a battery short circuit. At this moment, the prompting component can output corresponding prompting information (for example, output through an instrument, output through a sound playing device, and the like) so as to early warn the thermal runaway hidden danger of the safety of the power battery. Therefore, the early warning can be carried out before the thermal runaway happens, related personnel are reminded to process the thermal runaway, and the thermal runaway is avoided.
For another example, assuming that the second electrical parameter information is a voltage signal, if the second electrical parameter information acquired for multiple times is higher than a preset upper parameter limit value, the anomaly identification component may record the duration of the condition, and if the duration of the condition that the second electrical parameter information is higher than the upper parameter limit value reaches the preset duration, it may be that a battery short circuit is caused by crystallization of an electric core inside the power battery at the positive electrode. At this moment, the prompting component can output corresponding prompting information (for example, output through an instrument, output through a sound playing device, and the like) so as to early warn the thermal runaway hidden danger of the safety of the power battery. Therefore, the early warning can be carried out before the thermal runaway happens, related personnel are reminded to process the thermal runaway, and the thermal runaway is avoided.
The second acquisition frequency is less than the preset frequency, that is, less than the first acquisition frequency. That is, in a normal situation, the battery controller 140 may collect the second electrical parameter information at a low frequency to confirm the states of the devices in the thermal runaway monitor circuit 120, avoid excessive data processing, and save power, and when the wake-up signal is detected, since the safety valve may be opened, the battery controller 140 may change to collect the first electrical parameter information at a high frequency to confirm whether the safety valve is actually opened as soon as possible.
As described above, if the vehicle acquires the electrical parameter information at low speed at ordinary times, the wake-up signal generated by the power battery safety monitoring device can wake up the high-speed acquisition of the electrical parameter information by the battery controller, and compared with the conventional timing wake-up and detection mode, the method does not need to additionally provide a wake-up device, can realize the low-speed acquisition under the ordinary condition, and can also meet the high-speed acquisition under the requirement of quick judgment. Therefore, the performance of thermal runaway monitoring can be improved on the premise of saving the cost and the volume of the device.
Through the technical scheme, power battery safety monitoring device includes the power, thermal runaway monitoring circuit, signal processing circuit and battery controller, wherein, thermal runaway monitoring circuit connects the power, and, thermal runaway monitoring circuit includes the relief valve interconnecting link of series connection access, this relief valve interconnecting link breaks when power battery's relief valve opens, signal processing circuit is used for exporting the awakening signal to battery controller when relief valve interconnecting link breaks, battery controller is used for gathering the electrical parameter information of relief valve interconnecting link when detecting the awakening signal, and whether power battery takes place thermal runaway according to electrical parameter information determination. From this, the on-off through relief valve interconnecting link reflects the open mode of power battery relief valve, can in time detect this condition when power battery's relief valve is opened to, can confirm power battery whether take place the thermal runaway more quickly, just can in time detect at the initial stage that the thermal runaway takes place, be favorable to making the early warning faster and in time take safeguard procedures, strive for more time for driver and crew.
Optionally, the power battery safety monitoring device 100 may further include a self-detection trigger circuit for performing self-detection on the power battery safety monitoring device 100 to determine whether the power battery safety monitoring device 100 can work normally.
As shown in fig. 4, the self-detection trigger circuit may include a P-type MOS transistor S3, a gate of the P-type MOS transistor S3 is connected to the battery controller 140, a drain of the P-type MOS transistor S3 is connected to the input terminal a1 of the safety valve connection line 121, and a source of the P-type MOS transistor S3 is grounded.
The battery controller 140 is further configured to send a high-level signal to the gate of the P-type MOS transistor S3 to trigger the self-detection of the power battery safety monitoring device 100.
After the gate of the P-type MOS transistor S3 receives the high level signal, due to the characteristics of the P-type MOS transistor, the P-type MOS transistor S3 is turned on, and the safety valve connection line 121 is equivalent to ground connection, at this time, a scene in which the safety valve connection line 121 is disconnected can be simulated, and the self-detection power battery safety monitoring device 100 can normally trigger a corresponding processing process.
After the self-detection is triggered, the processing procedure is the same as the case of the disconnection of the safety valve connection line 121, and the description thereof is omitted.
When the detection is repeated for many times, the power battery safety monitoring device can normally complete the processing process, and the power battery safety monitoring device can be confirmed to pass the detection. In the detection process, if the electrical parameter is inconsistent with the expectation (for example, the electrical parameter information acquired at the acquisition point AD1 is inconsistent with the expected normal parameter), it indicates that the power battery safety monitoring device may have aging, failure, and other problems, and at this time, the battery controller may output corresponding prompt information to prompt the power battery safety monitoring device to perform circuit maintenance. The self-detection process can be triggered periodically to detect whether the power battery safety monitoring device can work normally or not.
Optionally, the power battery safety monitoring apparatus 100 may further include a protection device for preventing the voltage of the thermal runaway monitoring circuit from being too large, and then protecting the thermal runaway monitoring circuit. Illustratively, the protection device may use a voltage regulator tube. As shown in fig. 4, one end of the protection device D1 may be connected to the output terminal a2 of the safety valve connection wire 121, and the other end of the protection device is grounded to limit the voltage reaching the second resistor R2 to protect the next stage circuit.
Optionally, the power battery safety monitoring device 100 may further include a stabilizing device for eliminating the fluctuation and interference generated by the circuit. Illustratively, the stabilization device may use a capacitor. As shown in fig. 4, one end of the capacitor C1 is connected to the output terminal a2 of the safety valve connection line 121, and the other end is grounded, so as to eliminate the fluctuation and interference generated on the thermal runaway monitoring circuit 120. One end of the capacitor C2 is connected with the grid of the second N-type MOS tube S2, and the other end is grounded, so that the fluctuation and interference generated on the second signal processing branch circuit are eliminated.
As shown in fig. 6, the present disclosure also provides a vehicle including the power battery safety monitoring device 100 according to any embodiment of the present disclosure.
Optionally, the vehicle provided by the present disclosure may further include a thermal runaway processing component for performing thermal runaway fault processing in the event that it is determined that the power battery is thermally runaway. Thermal runaway fault handling may include, but is not limited to, the following: the system comprises a vehicle instrument alarm, an external acousto-optic alarm, a remote alarm, a battery cooling device, a power battery core temperature monitoring device and a vehicle parking control device.
Wherein the thermal runaway processing component may communicate with a corresponding device on the vehicle. For example, if the thermal runaway fault processing includes a vehicle instrument alarm, the thermal runaway processing component may communicate with the vehicle instrument informing the vehicle instrument to alarm. For another example, if the thermal runaway fault processing includes cooling the battery, the thermal runaway processing assembly may communicate with the vehicle air conditioner to cause the air conditioner to turn on a cooling mode to indirectly cool the battery. For another example, if the vehicle is handling a driving condition, in order to ensure the safety of the vehicle, the thermal runaway fault handling may include controlling the vehicle to stop, so that the thermal runaway processing component may communicate with the motor controller to reduce the motor power and achieve the stop.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A power battery safety monitoring device is characterized by comprising a power supply, a thermal runaway monitoring circuit, a signal processing circuit and a battery controller;
the thermal runaway monitoring circuit is connected with the power supply and comprises a safety valve connecting line connected in series, and the safety valve connecting line is disconnected when a safety valve of the power battery is opened;
the signal processing circuit is used for outputting a wake-up signal to the battery controller when the safety valve connecting line is disconnected;
the battery controller is used for collecting electrical parameter information of the safety valve connecting circuit when the wake-up signal is detected, and determining whether the power battery is out of control due to heat according to the electrical parameter information.
2. The apparatus of claim 1, wherein the thermal runaway monitoring circuit comprises a first resistor, the safety valve connection line, and a second resistor connected in series in that order;
one end of the first resistor is connected with the power supply, and the other end of the first resistor is connected with the input end of the safety valve connecting circuit;
the input end of the safety valve connecting circuit is electrically connected with a metal shell of a safety valve on the 1 st cell in the power battery, the metal shell of the Nth cell in the power battery is electrically connected with the metal shell of the safety valve on the (N +1) th cell in the power battery, and the metal shell of the Mth cell in the power battery is electrically connected with the output end of the safety valve connecting circuit, wherein the power battery comprises M cells in total, and N is more than or equal to 1 and less than or equal to M-1;
the first end of the second resistor is connected with the output end of the safety valve connecting circuit, and the second end of the second resistor is grounded.
3. The apparatus of claim 2, wherein the signal processing circuit comprises a first signal processing branch and a second signal processing branch;
the first signal processing branch is disconnected when the safety valve connecting line is connected and is connected when the safety valve connecting line is disconnected;
the second signal processing branch circuit is conducted when the first signal processing branch circuit is conducted, and the second signal processing branch circuit outputs the wake-up signal in a conducting state.
4. The apparatus of claim 3,
the first signal processing branch circuit comprises a third resistor, a first N-type MOS (metal oxide semiconductor) transistor, a fourth resistor and a fifth resistor, wherein one end of the third resistor is connected with the first end of the second resistor, the other end of the third resistor is connected with the grid electrode of the first N-type MOS transistor, one end of the fourth resistor is connected with the power supply, the other end of the fourth resistor is connected with the drain electrode of the first N-type MOS transistor, one end of the fifth resistor is connected with the source electrode of the first N-type MOS transistor, and the other end of the fifth resistor is grounded;
the second signal processing branch circuit comprises a sixth resistor, a second N-type MOS (metal oxide semiconductor) tube and a seventh resistor, one end of the sixth resistor is connected with the drain electrode of the first N-type MOS tube, the other end of the sixth resistor is connected with the grid electrode of the second N-type MOS tube, one end of the seventh resistor is connected with the source electrode of the second N-type MOS tube, the other end of the seventh resistor is grounded, the drain electrode of the second N-type MOS tube is connected with the power supply, and the second signal processing branch circuit outputs the awakening signal at the connection position of the seventh resistor and the source electrode of the second N-type MOS tube.
5. The device according to claim 2, further comprising a self-detection trigger circuit for self-detecting the power battery safety monitoring device to determine whether the power battery safety monitoring device can work normally;
the self-detection trigger circuit comprises a P-type MOS tube, the grid electrode of the P-type MOS tube is connected with the battery controller, the drain electrode of the P-type MOS tube is connected with the input end of the safety valve connecting circuit, and the source electrode of the P-type MOS tube is grounded;
the battery controller is also used for sending a high-level signal to the grid electrode of the P-type MOS tube so as to trigger the self-detection of the power battery safety monitoring device.
6. The apparatus of claim 1, wherein the battery controller comprises an electrical parameter acquisition component connected to an output of the safety valve connection line, the battery controller being configured to acquire electrical parameter information of the safety valve connection line via the electrical parameter acquisition component.
7. The apparatus of claim 6, wherein the battery controller is configured to collect, as the first electrical parameter information, the electrical parameter information of the safety valve connection line through the electrical parameter collection component at a first collection frequency when the wake-up signal is detected, and determine whether the thermal runaway of the power battery occurs according to the first electrical parameter information, wherein the first collection frequency is greater than a preset frequency.
8. The apparatus of claim 6, wherein the battery controller is configured to collect, by the electrical parameter collection component, electrical parameter information of the safety valve connection line as second electrical parameter information at a second collection frequency when the wake-up signal is not detected, and determine whether there is an abnormality in each component of the thermal runaway monitoring circuit according to the second electrical parameter information, wherein the second collection frequency is less than a preset frequency.
9. The apparatus of claim 8, wherein the battery controller stores a parameter upper value and a parameter lower value;
the battery controller further comprises an abnormality identification component, wherein the abnormality identification component is used for confirming the abnormality type of the power battery when the parameter value indicated by the second electrical parameter information is determined to be larger than the parameter upper limit value or smaller than the parameter lower limit value; and the number of the first and second groups,
the power battery safety monitoring device further comprises a prompt component, and the prompt component is used for outputting prompt information according to the abnormal type identified by the abnormal identification component.
10. A vehicle comprising a power cell safety monitoring device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011618960.6A CN114690042A (en) | 2020-12-31 | 2020-12-31 | Power battery safety monitoring device and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011618960.6A CN114690042A (en) | 2020-12-31 | 2020-12-31 | Power battery safety monitoring device and vehicle |
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| CN114690042A true CN114690042A (en) | 2022-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117289147A (en) * | 2023-11-24 | 2023-12-26 | 珠海科创储能科技有限公司 | Battery monitoring method and device, storage medium and electronic equipment |
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2020
- 2020-12-31 CN CN202011618960.6A patent/CN114690042A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117289147A (en) * | 2023-11-24 | 2023-12-26 | 珠海科创储能科技有限公司 | Battery monitoring method and device, storage medium and electronic equipment |
| CN117289147B (en) * | 2023-11-24 | 2024-04-02 | 珠海科创储能科技有限公司 | Battery monitoring method and device, storage medium and electronic equipment |
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