CN112763136A - Power battery pack pressure alarm system and alarm method - Google Patents
Power battery pack pressure alarm system and alarm method Download PDFInfo
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- CN112763136A CN112763136A CN202110375172.7A CN202110375172A CN112763136A CN 112763136 A CN112763136 A CN 112763136A CN 202110375172 A CN202110375172 A CN 202110375172A CN 112763136 A CN112763136 A CN 112763136A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a power battery pack pressure alarm system and an alarm method. This power battery package pressure alarm system includes: the MEMS pressure sensor comprises a pressure detection device and a first temperature detection device; an ASIC conditioning circuit comprising: the second temperature detection device, the compensation device and the communication device; and the battery management system is connected with the communication device and used for judging whether the power battery pack is abnormal or not according to the compensation pressure value and sending alarm information when the power battery pack is abnormal. The power battery pack pressure alarm system provided by the invention can provide accurate and timely alarm information, and can perform combined strategy alarm by adopting various information such as slope alarm, absolute value alarm, temperature abnormity and the like, so that the alarm effectiveness is ensured.
Description
Technical Field
The invention relates to the technical field of new energy of automobiles, in particular to a pressure alarm system and method for a power battery pack.
Background
The power battery is the key for the development of the new energy electric automobile, and the power battery is mainly characterized in that the comprehensive use performance is improved within a certain cost performance range. Because the automobile works under various working conditions, the strict working process and running state of the automobile are very important to influence the performance of the power battery. The low-temperature environment has a great influence on the performance of a power battery of the new energy automobile, and particularly, the problem of insufficient output power is easy to occur in the low-temperature environment from minus 40 ℃ to minus 20 ℃. The problem that the battery material system is changed to solve the problem is difficult, and batch production cannot be realized based on the consideration of material supply chain, equipment, manufacturing process, cost and the like under the current environment. Therefore, the auxiliary heating system is widely adopted to preheat the power battery of the new energy automobile at present so as to enable the new energy automobile to work in the best performance state.
The electrode material of the power battery is sealed in the battery pack in a certain structure, a certain pressure exists inside the electrode in the long-term charging and discharging process of the electrode, and the internal resistance of the battery is changed due to the long-term overpressure of the electrode of the battery, so that short circuit fire occurs, and therefore the internal pressure of the power battery needs to be researched. Since uneven distribution of air pressure caused by heating is common in the process of preheating the power battery, monitoring the internal pressure of the power battery by adopting a battery pack pressure sensor (BPS) is supported by more and more fields at present. And the BPS is always detecting the pressure quickly, so the requirement is provided for how to alarm the BPS accurately and timely.
Disclosure of Invention
Therefore, it is necessary to provide a power battery pack pressure alarm system and an alarm method capable of providing accurate and timely alarm information in view of the above technical problems.
The application provides a power battery package pressure alarm system includes:
the MEMS pressure sensor comprises a pressure detection device and a first temperature detection device; the pressure detection device is used for measuring the pressure of the power battery pack; the first temperature detection device is connected with the pressure detection device and used for measuring the temperature of the MEMS pressure sensor;
an ASIC conditioning circuit comprising: the second temperature detection device, the compensation device and the communication device; the second temperature detection device is connected with one end of the first temperature detection device, which is far away from the pressure detection device, and is used for measuring the temperature of the ASIC conditioning circuit; the compensation device is electrically connected with the second temperature detection device and the pressure detection device and is used for compensating the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit so as to obtain a compensation pressure value;
and the battery management system is connected with the communication device and used for judging whether the power battery pack is abnormal or not according to the compensation pressure value and sending alarm information when the power battery pack is abnormal.
In one embodiment, the pressure detection device comprises a pressure wheatstone bridge; the first detection means comprises a non-temperature sensitive resistor.
In one embodiment, the ASIC conditioning circuit further comprises:
the input end of the amplifier is connected with the pressure detection device and is used for amplifying the pressure detected by the pressure detection device;
the input end of the pressure digital-to-analog converter is connected with the output end of the amplifier, and the input end of the pressure digital-to-analog converter is connected with the compensation device and used for normalizing and quantizing the amplified pressure; the compensation device is used for compensating the pressure after normalization quantization according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit;
and the storage device is electrically connected with the compensation device and is used for storing the compensation pressure value.
In one embodiment, the amplifier comprises a programmable gain amplifier; the ASIC conditioning circuit further comprises an excitation signal generating device electrically connected with the MEMS pressure sensor and used for applying an excitation signal to the MEMS pressure sensor.
In one embodiment, the compensation device is used for carrying out nonlinear compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit so as to obtain a first compensation pressure value; the battery management system is used for comparing the first compensation pressure value with a pressure absolute threshold value and sending out an absolute value alarm when the first compensation pressure value exceeds the pressure absolute threshold value.
In one embodiment, the compensation device is further configured to perform pressure compensation and filter compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit, so as to obtain a second compensated pressure value; the battery management system is further used for sending out slope alarm when the second compensation pressure values collected for two times exceed the preset pressure value and the change directions of the second compensation pressure values collected for two times are the same.
In one embodiment, the battery management system determines whether a slope alarm needs to be issued when a difference between the measured temperature of the MEMS pressure sensor and the measured temperature of the ASIC conditioning circuit is less than a preset temperature value and when the battery management system does not issue an absolute alarm.
Based on the power battery pack pressure alarm system described in any of the above embodiments, the present application also provides an alarm method of the power battery pack pressure alarm system, including:
measuring the pressure of the power battery pack, the temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit;
compensating the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit to obtain a compensation pressure value;
and judging whether the power battery pack is abnormal or not according to the compensation pressure value, and sending alarm information when the power battery pack is abnormal.
In one embodiment, the judging whether the power battery pack is abnormal according to the compensation pressure value, and sending alarm information when the power battery pack is abnormal comprises:
comparing the measured temperature of the MEMS pressure sensor to the measured temperature of the ASIC conditioning circuit;
when the difference value of the two is larger than or equal to a preset temperature value, carrying out nonlinear compensation on the measured pressure of the power battery pack to obtain a first compensation pressure value; and comparing the first compensation pressure value with a pressure absolute threshold, and sending out an absolute value alarm when the first compensation pressure value exceeds the pressure absolute threshold.
In one embodiment, the determining whether the power battery pack is abnormal according to the compensation pressure value, and sending alarm information when the power battery pack is abnormal further includes:
when the difference value between the measured temperature of the MEMS pressure sensor and the measured temperature of the ASIC conditioning circuit of the battery management system is smaller than a preset temperature value and the first compensation pressure value does not exceed the absolute pressure threshold value, performing pressure compensation and filtering compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the measured temperature of the ASIC conditioning circuit of the battery management system to obtain a second compensation pressure value;
and sending slope alarm when the second compensation pressure values acquired twice continuously exceed the preset pressure value and the change directions of the second compensation pressure values acquired twice continuously are the same.
The power battery pack pressure alarm system and the alarm method have the following beneficial effects:
the application provides a power battery package pressure alarm system can provide accurate, timely alarm information, can not carry out the wrong report police to the short-term inhomogeneous of air pressure that the temperature variation arouses because power battery preheats and power battery package long-time work back, can report to the police fast under the thermal runaway condition, and can adopt the slope to report to the police, the absolute value is reported to the police, multiple information such as temperature anomaly carries out the joint strategy and reports to the police, guarantees the validity of reporting to the police.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a power battery pack pressure warning system according to an embodiment of the present application;
FIG. 2 is a flow chart of an alarm method of a power battery pack pressure alarm system according to an embodiment of the present disclosure;
fig. 3 is a flowchart of an alarm method of a power battery pack pressure alarm system according to another embodiment of the present application.
Description of reference numerals:
1-MEMS pressure sensor, 101-pressure detection device, 102-first temperature detection device, 2-ASIC conditioning circuit, 201-second temperature detection device, 202-compensation device, 203-communication device, 204-amplifier, 205-pressure digital-to-analog converter, 206-storage device, 3-battery management system.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first temperature detection device may be referred to as a second temperature detection device, and similarly, a second temperature detection device may be referred to as a first temperature detection device, without departing from the scope of the present application. Both the first temperature detection means and the second temperature detection means are temperature detection means, but they are not the same temperature detection means.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Referring to fig. 1, in an embodiment of the present application, a power battery pack pressure warning system includes:
the MEMS pressure sensor 1 comprises a pressure detection device 101 and a first temperature detection device 102; the pressure detection device 101 is used for measuring the pressure of the power battery pack; the first temperature detection device 102 is connected with the pressure detection device 101 and is used for measuring the temperature of the MEMS pressure sensor 1;
the ASIC conditioning circuit 2 comprises a second temperature detection device 201, a compensation device 202 and a communication device 203; the second temperature detection device 201 is connected with one end of the first temperature detection device 102 far away from the pressure detection device 101, and is used for measuring the temperature of the ASIC conditioning circuit 2; the compensation device 202 is electrically connected with the second temperature detection device 201 and the pressure detection device 101, and is used for compensating the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor 1 and the temperature of the ASIC conditioning circuit 2 to obtain a compensation pressure value;
and the battery management system 3 is connected with the communication device 203 and is used for judging whether the power battery pack is abnormal according to the compensation pressure value and sending alarm information when the power battery pack is abnormal.
The power battery pack pressure alarm system provided by the embodiment can compensate the nonlinearity caused by temperature change according to the temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit by arranging the ASIC conditioning circuit, thereby providing accurate and timely alarm information and avoiding false alarm caused by transient unevenness of air pressure caused by temperature change in circulating cooling after the battery is preheated and the power battery pack works for a long time.
In one embodiment, the pressure sensing device 101 comprises a pressure Wheatstone bridge.
Specifically, referring to fig. 1, in one embodiment, the pressure detection device 101 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, wherein a second end of the first resistor R1 is connected to a first end of the second resistor R2, a second end of the second resistor R2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is connected to a first end of the first resistor R1.
Considering that the sensitivity of the pressure detection device 101 to temperature may cause the temperature measured by the first temperature detection device 102 to be asynchronous with the temperature measured by the ASIC conditioning circuit 2, in one embodiment, the first temperature detection device 102 may include a non-temperature sensitive resistor, and the temperature of the MEMS pressure sensor 1 is measured through the other end of the non-temperature sensitive resistor. Since the non-temperature sensitive resistor is not sensitive to temperature, the temperature change detected by the first temperature detecting means 102 is a self temperature change from the pressure detecting means 101.
The power battery pack pressure alarm system provided by the above embodiment measures the temperature of the pressure detection device 101 through the other end of the non-temperature sensitive resistor, so as to ensure that the first temperature detection device 102 can efficiently acquire the temperature on the pressure detection device 101 in real time; when the temperature changes slowly, that is, when the temperature is heated and cooled down normally, the error between the temperature measured by the first temperature detection device 102 and the temperature measured by the ASIC conditioning circuit 2 can be considered to be very small.
With continued reference to fig. 1, in one embodiment, the ASIC conditioning circuit 2 further includes:
the input end of the amplifier 204 is connected with the pressure detection device 101 and is used for amplifying the pressure detected by the pressure detection device 101;
the input end of the pressure digital-to-analog converter 205 is connected with the output end of the amplifier 204, and the input end of the pressure digital-to-analog converter 205 is connected with the compensation device 202, and is used for normalizing and quantizing the amplified pressure; the compensation device 202 is used for compensating the normalized and quantized pressure according to the measured temperature of the MEMS pressure sensor 1 and the temperature of the ASIC conditioning circuit 2;
and the storage device 206 is electrically connected with the compensation device 202 and is used for storing the compensation pressure value.
Specifically, in the power battery pack pressure alarm system provided in the above embodiment, the amplifier 204 may include a programmable gain amplifier; in some embodiments, the ASIC conditioning circuit 2 may further comprise an excitation signal generating device 207 electrically connected to the MEMS pressure sensor 1 for applying an excitation signal to the MEMS pressure sensor 1.
Specifically, in one embodiment, the compensation device 202 is configured to perform nonlinear compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor 1 and the temperature of the ASIC conditioning circuit 2, so as to obtain a first compensated pressure value; at this time, the battery management system 3 is configured to compare the first compensation pressure value with a pressure absolute threshold, and issue an absolute value alarm when the first compensation pressure value exceeds the pressure absolute threshold.
In other embodiments, the compensation device 202 may be further configured to perform pressure compensation and filter compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor 1 and the temperature of the ASIC conditioning circuit 2 to obtain a second compensated pressure value; at this time, the battery management system 3 is further configured to send out a slope alarm when the second compensation pressure values acquired twice continuously exceed the preset pressure value and the change directions of the second compensation pressure values acquired twice continuously are the same.
In the pressure alarm system for the power battery pack provided by the embodiment, under the state that the power battery pack is out of control due to the isolation and low power consumption of the ASIC conditioning circuit 2, the temperature value obtained by measurement is updated to lag behind the temperature value obtained by measurement of the pressure detection device 101, and the battery management system 3 sends out slope alarm when the second compensation pressure values acquired twice continuously exceed the preset pressure value and the change directions of the second compensation pressure values acquired twice continuously are the same, so that the timeliness of alarm and the accuracy of alarm are ensured.
In some embodiments, different slope threshold values may be set according to different sizes of external spaces where the power battery pack is located, and when the second compensation pressure values acquired twice continuously exceed the preset pressure value and the change slope of the second compensation pressure values acquired twice continuously exceeds the preset slope threshold value, a slope alarm is issued. The magnitude of the slope threshold is not limited in this embodiment.
In one embodiment, the battery management system 3 determines whether a slope alarm needs to be issued when the difference between the measured temperature of the MEMS pressure sensor 1 and the measured temperature of the ASIC conditioning circuit 2 is smaller than a preset temperature value and the battery management system 3 does not issue an absolute alarm.
Referring to fig. 2, the present application further provides an alarm method of a power battery pack pressure alarm system, including the following steps:
s1: measuring the pressure of the power battery pack, the temperature of the MEMS pressure sensor 1 and the temperature of the ASIC conditioning circuit 2;
s2: compensating the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor 1 and the temperature of the ASIC conditioning circuit 2 to obtain a compensation pressure value;
s3: and judging whether the power battery pack is abnormal or not according to the compensation pressure value, and sending alarm information when the power battery pack is abnormal.
Specifically, in one embodiment, step S3 may include the following steps:
comparing the measured temperature of the MEMS pressure sensor 1 with the measured temperature of the ASIC conditioning circuit 2;
when the difference value of the two is larger than or equal to a preset temperature value, carrying out nonlinear compensation on the measured pressure of the power battery pack to obtain a first compensation pressure value; and comparing the first compensation pressure value with a pressure absolute threshold, and sending out an absolute value alarm when the first compensation pressure value exceeds the pressure absolute threshold.
In other embodiments, step S3 may further include the steps of:
when the difference value between the measured temperature of the MEMS pressure sensor 1 and the measured temperature of the ASIC conditioning circuit 2 of the battery management system 3 is smaller than a preset temperature value, and the first compensation pressure value does not exceed the pressure absolute threshold value, performing pressure compensation and filtering compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor 1 and the temperature of the ASIC conditioning circuit 2 to obtain a second compensation pressure value;
and sending slope alarm when the second compensation pressure values acquired twice continuously exceed the preset pressure value and the change directions of the second compensation pressure values acquired twice continuously are the same.
In some embodiments of the present application, when the difference between the measured temperature of the MEMS pressure sensor 1 and the measured temperature of the ASIC conditioning circuit 2 of the battery management system 3 is smaller than the preset temperature value, and the first compensation pressure value does not exceed the absolute pressure threshold, the process of performing pressure compensation and filtering compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor 1 and the measured temperature of the ASIC conditioning circuit 2 to obtain a second compensation pressure value is specifically described below:
referring to fig. 3, when the difference between the measured temperature of the MEMS pressure sensor 1 and the measured temperature of the ASIC regulator circuit 2 of the battery management system 3 is smaller than the preset temperature value, and the first compensation pressure value does not exceed the absolute pressure threshold, an algorithm for adjusting the length of the data pool is designed by establishing the data pool to store the first compensation pressure value continuously for a period of time, a pressure trip point caused by temperature change is flattened, a second-order filter algorithm is used for flattening, the current filtering output time is set to n, and the pressure filtering data output is y (n) which is obtained by recursion according to the following formula:
y(n)=b(0)x(n)+b(1)x(n-1)+b(2)x(n-2)+…+b(m)x(n-m)-a(1)y(n-1)-a(2)y(n-2)-a(m)y(n-m)；
where a-sequence and b-sequence represent a set of series that may be stored in storage 206, for example: a powered down non-volatile memory (NVM) region within storage 206; m is an integer, which indicates the length of the relevant data pool to be called, and needs to be adjusted according to the variation value obtained by the pressure detection device 101 in the working temperature range.
Simultaneously entering a data pool to analyze data, the following two sequences are needed:
dy(n)=y(n)-y(n-1)；
dx(n)=x(n)-x(n-1)；
wherein, the x sequence is a compensation value x sequence. Represents a second compensated pressure value after pressure compensation by the compensation device 202; the sequence y is a sequence of filtered values y representing second compensated pressure values after filter compensation by the compensation device 202.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power battery pack pressure alarm system, comprising:
the MEMS pressure sensor comprises a pressure detection device and a first temperature detection device; the pressure detection device is used for measuring the pressure of the power battery pack; the first temperature detection device is connected with the pressure detection device and used for measuring the temperature of the MEMS pressure sensor;
an ASIC conditioning circuit comprising: the second temperature detection device, the compensation device and the communication device; the second temperature detection device is connected with one end of the first temperature detection device, which is far away from the pressure detection device, and is used for measuring the temperature of the ASIC conditioning circuit; the compensation device is electrically connected with the second temperature detection device and the pressure detection device and is used for compensating the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit so as to obtain a compensation pressure value;
and the battery management system is connected with the communication device and used for judging whether the power battery pack is abnormal or not according to the compensation pressure value and sending alarm information when the power battery pack is abnormal.
2. The power pack pressure warning system of claim 1, wherein the pressure detection device comprises a pressure wheatstone bridge; the first detection means comprises a non-temperature sensitive resistor.
3. The power pack pressure warning system of claim 1, wherein the ASIC conditioning circuit further comprises:
the input end of the amplifier is connected with the pressure detection device and is used for amplifying the pressure detected by the pressure detection device;
the input end of the pressure digital-to-analog converter is connected with the output end of the amplifier, and the input end of the pressure digital-to-analog converter is connected with the compensation device and used for normalizing and quantizing the amplified pressure; the compensation device is used for compensating the pressure after normalization quantization according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit;
and the storage device is electrically connected with the compensation device and is used for storing the compensation pressure value.
4. The power pack pressure warning system of claim 3, wherein the amplifier comprises a programmable gain amplifier; the ASIC conditioning circuit further comprises an excitation signal generating device electrically connected with the MEMS pressure sensor and used for applying an excitation signal to the MEMS pressure sensor.
5. The power battery pack pressure warning system according to any one of claims 1 to 4, wherein the compensation device is configured to perform nonlinear compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit to obtain a first compensated pressure value; the battery management system is used for comparing the first compensation pressure value with a pressure absolute threshold value and sending out an absolute value alarm when the first compensation pressure value exceeds the pressure absolute threshold value.
6. The power battery pack pressure warning system of claim 5, wherein the compensation device is further configured to perform pressure compensation and filter compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit to obtain a second compensated pressure value; the battery management system is further used for sending out slope alarm when the second compensation pressure values collected for two times exceed the preset pressure value and the change directions of the second compensation pressure values collected for two times are the same.
7. The power battery pack pressure warning system of claim 6, wherein the battery management system determines whether a slope alarm needs to be issued when the difference between the measured temperature of the MEMS pressure sensor and the measured temperature of the ASIC conditioning circuit is less than a preset temperature value and when the battery management system does not issue an absolute alarm.
8. An alarm method based on the power battery pack pressure alarm system according to any one of claims 1 to 7, characterized by comprising the following steps:
measuring the pressure of the power battery pack, the temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit;
compensating the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the temperature of the ASIC conditioning circuit to obtain a compensation pressure value;
and judging whether the power battery pack is abnormal or not according to the compensation pressure value, and sending alarm information when the power battery pack is abnormal.
9. The alarm method according to claim 8, wherein judging whether the power battery pack is abnormal according to the compensation pressure value, and sending alarm information when the power battery pack is abnormal comprises:
comparing the measured temperature of the MEMS pressure sensor to the measured temperature of the ASIC conditioning circuit;
when the difference value of the two is larger than or equal to a preset temperature value, carrying out nonlinear compensation on the measured pressure of the power battery pack to obtain a first compensation pressure value; and comparing the first compensation pressure value with a pressure absolute threshold, and sending out an absolute value alarm when the first compensation pressure value exceeds the pressure absolute threshold.
10. The alarm method according to claim 9, wherein judging whether the power battery pack is abnormal according to the compensation pressure value, and sending alarm information when the power battery pack is abnormal further comprises:
when the difference value between the measured temperature of the MEMS pressure sensor and the measured temperature of the ASIC conditioning circuit of the battery management system is smaller than a preset temperature value and the first compensation pressure value does not exceed the absolute pressure threshold value, performing pressure compensation and filtering compensation on the measured pressure of the power battery pack according to the measured temperature of the MEMS pressure sensor and the measured temperature of the ASIC conditioning circuit of the battery management system to obtain a second compensation pressure value;
and sending slope alarm when the second compensation pressure values acquired twice continuously exceed the preset pressure value and the change directions of the second compensation pressure values acquired twice continuously are the same.
Priority Applications (1)
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