CN106898829B - Battery system instability detection equipment and method - Google Patents
Battery system instability detection equipment and method Download PDFInfo
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- CN106898829B CN106898829B CN201710120133.6A CN201710120133A CN106898829B CN 106898829 B CN106898829 B CN 106898829B CN 201710120133 A CN201710120133 A CN 201710120133A CN 106898829 B CN106898829 B CN 106898829B
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- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009423 ventilation Methods 0.000 claims abstract description 22
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims description 33
- 230000005540 biological transmission Effects 0.000 claims description 18
- 230000000368 destabilizing effect Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 230000001687 destabilization Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 7
- 239000000306 component Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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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
- H01M10/4285—Testing apparatus
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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
- H01M10/44—Methods for charging or discharging
- H01M10/445—Methods for charging or discharging in response to gas pressure
-
- 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
Abstract
The embodiment of the invention provides a device and a method for detecting instability of a battery system. The instability detection equipment is applied to a battery system, and the battery system comprises a first shell, a battery unit and a second shell, wherein the battery unit is arranged in a closed space formed by the first shell and the second shell. The instability detection equipment comprises an air pressure acquisition device and an alarm device which are connected with each other in a communication mode and are respectively arranged inside and outside the closed space. The air pressure acquisition device comprises an air pressure acquisition box with a closed cavity structure, a bidirectional ventilation valve arranged on the side surface of the air pressure acquisition box body, and a first air pressure acquisition device and a second air pressure acquisition device. The air pressure acquisition device respectively acquires air pressure data inside and outside the air pressure acquisition box through the first air pressure acquisition device and the second air pressure acquisition device, and sends the air pressure data to the alarm device. The alarm device receives the air pressure data, judges whether the battery system is unstable according to the air pressure data, and alarms when the battery system is unstable, so that the battery system is detected in real time, and serious loss is avoided.
Description
Technical Field
The invention relates to the technical field of battery system instability detection, in particular to a battery system instability detection device and a battery system instability detection method.
Background
With the rapid development of electronic technology, the use of pure electric vehicles and hybrid electric vehicles is becoming more popular, the requirements of the pure electric vehicles and the hybrid electric vehicles on high-performance and high-reliability battery systems are also continuously improved, and the battery systems provide corresponding proper and stable electric energy for the pure electric vehicles and the hybrid electric vehicles, so that the pure electric vehicles and the hybrid electric vehicles can normally operate, corresponding performances are exerted, and the running states of the pure electric vehicles and the hybrid electric vehicles are correspondingly determined by the safety reliability and the electric energy output stability of the battery systems. However, there are many technical problems to be solved in terms of battery systems, and the safety problems of battery systems and electric-only and hybrid vehicles are one of the most important problems.
The battery system is a very complex power supply system, and when a battery cell in the battery system fails, an electrical component (such as a relay) fails, or a thermal management device fails, the battery system may become unstable, which may easily cause a fire in the battery system to spread to the whole vehicle, resulting in serious loss.
However, in the present situation, no device or equipment capable of monitoring the state of the battery system and reminding the user to take fire extinguishing protection measures in time under the condition of unstable or fire occurrence in the battery system is found on the market, so that serious loss is avoided. Therefore, how to provide a detection device with simple structure and low manufacturing difficulty, which can monitor the state of the battery system in real time, is a technical problem which needs to be solved urgently for the person skilled in the art.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the battery system instability detection equipment and the method which have the advantages of simple structure and low manufacturing difficulty, can monitor the state of a battery system in real time, send an alarm prompt when the battery system is in an unstable state and avoid serious loss.
As for the battery system instability detection apparatus, a preferred embodiment of the present invention provides a battery system instability detection apparatus. The battery system instability detection equipment is applied to a battery system, the battery system comprises a first shell, a battery unit and a second shell, and the battery unit is arranged in a closed space formed by the first shell and the second shell. The instability detection equipment comprises an air pressure acquisition device and an alarm device which are in communication connection with each other;
the air pressure acquisition device is arranged in the closed space and comprises an air pressure acquisition box, a two-way ventilation valve, a first air pressure acquisition device and a second air pressure acquisition device;
the air pressure collecting box is of a closed cavity structure, and the bidirectional ventilation valve is arranged on one box body side surface of the air pressure collecting box, so that the air pressure collecting box performs air exchange through the bidirectional ventilation valve;
the first air pressure collector is arranged in the air pressure collecting box, the second air pressure collector is arranged outside the air pressure collecting box and is positioned in the closed space, the first air pressure collector and the second air pressure collector respectively collect air pressure data in the air pressure collecting box and air pressure data in the closed space outside the air pressure collecting box, and the collected air pressure data are sent to the alarm device;
the alarm device is arranged outside the closed space, receives the air pressure data, judges whether the battery system is unstable or not according to the air pressure data, and alarms when judging to be in an unstable state so as to realize the instability detection of the battery system.
In a preferred embodiment of the present invention, the gas exchange rate of the bi-directional ventilation valve when the battery system is in a normal state is equal to the gas exchange rate of the bi-directional ventilation valve when the battery system is in a unstable state.
In a preferred embodiment of the present invention, the first air pressure collector or the second air pressure collector includes an air pressure sensor for collecting air pressure data and a data transmission unit for transmitting data, where the data transmission unit is electrically connected to the air pressure sensor, so as to transmit the air pressure data collected by the air pressure sensor to the alarm device.
In a preferred embodiment of the present invention, the alarm device includes a data receiving unit for receiving air pressure data sent by the first air pressure collector and the second air pressure collector, a data processing unit for processing the air pressure data, and an alarm unit for sending an alarm prompt;
the data processing unit is electrically connected with the data receiving unit to process the air pressure data received by the data receiving unit and judge whether the battery system is in an unstable state according to the processing result;
the alarm unit is electrically connected with the data processing unit, so as to send out an alarm prompt when the data processing unit judges that the battery system is in a unsteady state.
In a preferred embodiment of the present invention, the air pressure collecting box is fixed on the inner wall of the first housing or the inner wall of the second housing, so that the air pressure collecting box is fixed in the closed space.
In a preferred embodiment of the present invention, a sealing level of the sealed space formed by the first housing and the second housing is not lower than an IP67 level.
In terms of a battery system instability detection method, a preferred embodiment of the present invention provides a battery system instability detection method. The battery system instability detection method is applied to the battery system instability detection equipment. The instability detection method comprises the following steps:
the air pressure acquisition device acquires air pressure data in the air pressure acquisition box and air pressure data in a closed space outside the air pressure acquisition box, and sends the acquired air pressure data to the alarm device;
the alarm device receives the air pressure data sent by the air pressure acquisition device, processes the air pressure data and judges whether the battery system is in an unstable state according to a result obtained by processing;
when the alarm device judges that the battery system is in a destabilization state, the alarm device generates an alarm signal and sends out an alarm prompt so as to realize the destabilization detection of the battery system.
In a preferred embodiment of the present invention, the step of processing the air pressure data and determining whether the battery system is in a unstable state according to a result obtained by the processing includes:
subtracting the air pressure data in the air pressure acquisition box received by the alarm device from the air pressure data in the corresponding airtight space outside the air pressure acquisition box to obtain the absolute value of the corresponding air pressure difference value;
comparing the absolute value of the air pressure difference value with a preset air pressure value stored in the alarm device, and judging whether the battery system is in a destabilizing state according to a comparison result, wherein the preset air pressure value is larger than the absolute value of the maximum air pressure difference value inside and outside the air pressure acquisition box corresponding to the battery system in a normal state and smaller than the absolute value of the minimum air pressure difference value inside and outside the air pressure acquisition box corresponding to the battery system in the destabilizing state.
In a preferred embodiment of the present invention, the step of comparing the absolute value of the air pressure difference with a preset air pressure value stored in the alarm device, and determining whether the battery system is in a unstable state according to the comparison result includes:
when the absolute value of the air pressure difference value is smaller than the preset air pressure value, judging that the battery system is in a normal state;
and when the absolute value of the air pressure difference value is larger than the preset air pressure value, judging that the battery system is in a instable state.
In a preferred embodiment of the present invention, the method for detecting instability further includes:
and setting and storing a preset air pressure value in the alarm device.
Compared with the prior art, the battery system instability detection equipment and the battery system instability detection method provided by the preferred embodiment of the invention have the following beneficial effects: the battery system instability detection equipment is simple in structure and low in manufacturing difficulty, the air pressure data in the air pressure acquisition box and the air pressure data in the airtight space outside the air pressure acquisition box are acquired by the air pressure acquisition device, the acquired air pressure data are sent to the alarm device, the alarm device receives the air pressure data, judges whether the battery system is unstable or not according to the air pressure data, and alarms when judging to be in an unstable state, so that the state of the battery system is monitored in real time, and an alarm prompt is sent when the battery system is unstable, so that serious loss is avoided.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery system according to a preferred embodiment of the present invention.
Fig. 2 is a schematic block diagram of a battery system instability detection apparatus according to a preferred embodiment of the present invention.
Fig. 3 is a block diagram of a first air pressure collector according to a preferred embodiment of the present invention.
Fig. 4 is a block schematic diagram of the alarm device shown in fig. 2.
Fig. 5 is a flowchart of a method for detecting instability of a battery system according to a preferred embodiment of the present invention.
Fig. 6 is a schematic flow chart of the substeps included in step S320 in fig. 5.
Fig. 7 is a schematic flow chart of the substeps included in step S322 in fig. 6.
Fig. 8 is a schematic flow chart of a method for detecting instability of a battery system according to a preferred embodiment of the present invention.
Icon: 10-battery system; 11-a first housing; 12-a second housing; 13-battery cell; 100-battery system instability detection equipment; 110-an air pressure acquisition device; 120-alarm device; 111-an air pressure acquisition box; 112-a bi-directional ventilation valve; 113-a first air pressure collector; 114-a second air pressure collector; 210-an air pressure sensor; 220-a data transfer unit; 121-a data receiving unit; 122-a data processing unit; 123-an alarm unit; 124-memory.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, a schematic structure of a battery system 10 according to a preferred embodiment of the invention is shown. In the embodiment of the invention, the battery system 10 includes a first housing 11, a second housing 12, and a battery unit 13. The first housing 11 cooperates with the second housing 12 to form a closed space, and the battery unit 13 is disposed in the closed space to realize the power supply function of the battery system 10.
In this embodiment, the first housing 11 cooperates with the second housing 12 to form a closed space that is isolated from the outside, and the closed space is not in gas exchange with the outside. Specifically, the sealing level of the enclosed space may be IP67 level or a sealing level higher than IP67 level. In view of the production cost and difficulty of the manufacturing process of the battery system 10, in the present embodiment, it is preferable to use a sealed space formed by the first case 11 and the second case 12 having a sealing level conforming to the IP67 level to accommodate the battery cells 13.
In this embodiment, the battery unit 13 is a core component for implementing the power supply function of the battery system 10, and the battery unit 13 may include a battery module, an electrical component (such as a relay) for implementing the power supply function in cooperation with the battery module, and a thermal management device for protecting the battery module. The battery module is matched with the electric component and the thermal management device to realize the power supply function of the battery system 10.
It will be understood, of course, that the above-mentioned battery module, electrical component and thermal management device are only one implementation of the battery unit 13 provided by the embodiment of the present invention, and the present invention may also include more implementations of the battery unit 13.
Referring to fig. 2, a block diagram of a battery system instability detection apparatus 100 according to a preferred embodiment of the present invention is shown. The battery system instability detection device 100 is applied to the battery system 10 to detect the instability of the battery system 10 in real time, and send an alarm prompt when the battery system 10 is in an unstable state, so as to avoid serious loss. In the embodiment of the present invention, the battery system instability detection apparatus 100 includes an air pressure acquisition device 110 for acquiring air pressure data and an alarm device 120 for sending an alarm prompt. The air pressure acquisition device 110 and the alarm device 120 are in communication connection with each other to realize data transmission or interaction. In this embodiment, the communication connection between the air pressure acquisition device 110 and the alarm device 120 may be a wired communication connection connected through a wired network, or may be a wireless communication connection connected through a wireless network.
Specifically, referring to fig. 1 again, in this embodiment, the air pressure collecting device 110 is disposed in a closed space formed by the first housing 11 and the second housing 12 in the battery system 10, the alarm device 120 is disposed outside the closed space, and the air pressure collecting device 110 and the alarm device 120 establish communication connection through a wired network or a wireless network.
In the embodiment of the present invention, the air pressure collecting device 110 includes an air pressure collecting box 111, a bi-directional ventilation valve 112, a first air pressure collector 113 and a second air pressure collector 114. The air pressure collecting box 111 is disposed in the closed space, and the bidirectional ventilation valve 112 is disposed on one box body side surface of the air pressure collecting box 111, so that the air pressure collecting box 111 performs air exchange through the bidirectional ventilation valve 112. The first air pressure collector 113 is disposed in the air pressure collecting box 111, the second air pressure collector 114 is disposed outside the air pressure collecting box 111 and is located in the closed space, the first air pressure collector 113 and the second air pressure collector 114 collect air pressure data in the air pressure collecting box 111 and air pressure data in the closed space outside the air pressure collecting box 111 respectively, and send the collected air pressure data to the alarm device 120.
In this embodiment, the air pressure collecting box 111 is a closed cavity structure, and the air pressure collecting box 111 performs air exchange with the closed space outside the air pressure collecting box 111 only through the bidirectional ventilation valve 112. Specifically, a closed cavity is disposed in the air pressure collecting box 111, and the closed cavity is isolated from the outside and is communicated with the closed space outside the air pressure collecting box 111 only through the bidirectional ventilation valve 112.
In this embodiment, the air pressure collecting box 111 may be fixed in the closed space by being fixed to the inner wall of the first housing 11 or the inner wall of the second housing 12. Specifically, the air pressure collecting box 111 may be integrally formed with the first housing 11 or the second housing 12, so that the air pressure collecting box 111 is fixed on the inner wall of the first housing 11 or the inner wall of the second housing 12; the air pressure collecting box 111 is independent of the first housing 11 and the second housing 12, and the air pressure collecting box 111 may be fixed on the inner wall of the first housing 11 or the inner wall of the second housing 12 by means of fastening, adhesion, etc.
In this embodiment, the bi-directional ventilation valve 112 performs gas exchange at a certain rate. Specifically, the gas exchange rate of the bi-directional gas permeable valve 112 when the battery system 10 is in a normal state is equal to the gas exchange rate of the bi-directional gas permeable valve 112 when the battery system 10 is in a unstable state, wherein the normal state refers to a state when the battery system 10 is operating normally, and the unstable state refers to a state when the battery unit 13 in the battery system 10 is subject to an accident (such as a fire of a battery module in the battery unit 13, a malfunction of an electrical component, or damage of a thermal management device), thereby causing the battery system 10 to become unstable, and the gas pressure value in the closed space increases sharply, which is very liable to cause a fire and cause serious loss.
In this embodiment, the first air pressure collector 113 is disposed in the closed cavity in the air pressure collecting box 111, and the second air pressure collector 114 is disposed in the closed space outside the air pressure collecting box 111, so that the first air pressure collector 113 and the second air pressure collector 114 collect the air pressure data in the air pressure collecting box 111 and the air pressure data in the closed space outside the air pressure collecting box 111 respectively.
In this embodiment, the distance between the first air pressure collector 113 and the second air pressure collector 114 is smaller than a preset distance, where the preset distance is a set distance that enables the air pressure data collected by the first air pressure collector 113 to be close to the air pressure data collected by the second air pressure collector 114. Specifically, when the battery system 10 is in a normal state, the distance between the first air pressure collector 113 and the second air pressure collector 114 is smaller than the preset distance, so that the air pressure data collected by the first air pressure collector 113 and the air pressure data collected by the second air pressure collector 114 tend to be consistent. When the battery system 10 is in a destabilizing state, because the rate of gas exchange performed by the bidirectional ventilation valve 112 is fixed, the gas pressures inside and outside the gas pressure collecting box 111 cannot be balanced in time, and compared with the gas pressure data collected by the first gas pressure collector 113 when the battery system 10 is in a destabilizing state and the gas pressure data collected by the first gas pressure collector 113 when the battery system 10 is in a normal state, the gas pressure data in the gas pressure collecting box 111 has a very small change rate, but the gas pressure data collected by the second gas pressure collector 114 correspondingly increases sharply due to the sharply increased temperature in the closed space, and the absolute value of the difference value between the gas pressure data in the corresponding gas pressure collecting box 111 and the gas pressure data outside the gas pressure collecting box 111 correspondingly increases sharply, so that the gas pressure data collected by the first gas pressure collector 113 reaches the standard of alarming by the alarming device 120 at a faster speed, thereby improving the sensitivity of the destabilizing detection of the battery system.
Referring to fig. 3, a block diagram of a first air pressure collector 113 according to a preferred embodiment of the invention is shown. In this embodiment, the first air pressure collector 113 includes an air pressure sensor 210 for collecting air pressure data and a data transmission unit 220 for transmitting data. The data transmission unit 220 is electrically connected to the air pressure sensor 210, so as to transmit the air pressure data collected by the air pressure sensor 210 to the alarm device 120. In this embodiment, the first air pressure collector 113 and the second air pressure collector 114 belong to the same air pressure collector, and the second air pressure collector 114 also includes the air pressure sensor 210 and the data transmission unit 220.
In this embodiment, the air pressure sensor 210 may be a pressure sensor, and the data transmission unit 220 may include a wired data transmission module and a wireless data transmission module. The data transmission unit 220 may send the air pressure data collected by the air pressure sensor 210 to the alarm device 120 through a wired data transmission module connected with the alarm device 120 in a wired communication manner, and the data transmission unit 220 may also send the air pressure data collected by the air pressure sensor 210 to the alarm device 120 through a wireless data transmission module connected with the alarm device 120 in a wireless communication manner, where specific data transmission manners may be set differently according to requirements.
In this embodiment, the alarm device 120 receives the air pressure data in the air pressure collecting box 111 collected by the first air pressure collector 113 and the air pressure data in the airtight space outside the air pressure collecting box 111 collected by the second air pressure collector 114, determines whether the battery system 10 is unstable according to the two corresponding sets of air pressure data, and alarms when the battery system 10 is determined to be in an unstable state, so as to realize the detection of the instability of the battery system 10.
Specifically, please refer to fig. 4, which is a block diagram of the alarm device 120 shown in fig. 2. In the embodiment of the present invention, the alarm device 120 includes a data receiving unit 121 for receiving the air pressure data sent by the first air pressure collector 113 and the second air pressure collector 114, a data processing unit 122 for processing the air pressure data, and an alarm unit 123 for sending an alarm prompt.
In this embodiment, the data processing unit 122 is electrically connected to the data receiving unit 121, so as to process the air pressure data received by the data receiving unit 121, and determine whether the battery system 10 is in a unstable state according to the result obtained by the processing.
In this embodiment, the alarm unit 123 is electrically connected to the data processing unit 122, so as to send an alarm prompt when the data processing unit 122 determines that the battery system 10 is in a unstable state, where the alarm unit 123 may include an alarm generator.
In this embodiment, the alarm device 120 may further include a memory 124. The memory 124 may store the air pressure data sent by the first air pressure collector 113 and the second air pressure collector 114, or may store a software function module and a computer program required by the data processing unit 122 to process the air pressure data, and determine whether the battery system 10 is in a unstable state according to a result obtained by the processing. In this embodiment, the Memory 124 may be, but is not limited to, a random access Memory (Random Access Memory, RAM), a Read Only Memory (ROM), a programmable Read Only Memory (Programmable Read-Only Memory, PROM), an erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc.
Fig. 5 is a flowchart of a method for detecting instability of a battery system according to a preferred embodiment of the present invention. The battery system instability detection method is applied to the battery system instability detection apparatus 100 described above, and the specific flow and steps of the battery system instability detection method shown in fig. 5 are described in detail below.
In an embodiment of the present invention, the method for detecting instability of a battery system may include the steps of:
in step S310, the air pressure collecting device 110 collects air pressure data in the air pressure collecting box 111 and air pressure data in the airtight space outside the air pressure collecting box 111, and sends the collected air pressure data to the alarm device 120.
In the present embodiment of the present invention, in the present embodiment, the air pressure acquisition device 110 respectively acquires air pressure data in the air pressure acquisition box 111 and the air pressure data in the air pressure acquisition box 111 through a first air pressure acquisition device 113 arranged in the air pressure acquisition box 111 and a second air pressure acquisition device 114 arranged in the air pressure acquisition box 111, and the data transmission unit 220 in the first air pressure collector 113 and the data transmission unit 220 in the second air pressure collector 114 respectively transmit the air pressure data in the air pressure collecting box 111 and the air pressure data in the airtight space outside the air pressure collecting box 111 to the alarm device 120.
In step S320, the alarm device 120 receives the air pressure data sent by the air pressure acquisition device 110, processes the air pressure data, and determines whether the battery system 10 is in a unstable state according to the result obtained by the processing.
In this embodiment, the data receiving unit 121 in the alarm device 120 is respectively connected to the data transmitting unit 220 in the first air pressure collector 113 and the data transmitting unit 220 in the second air pressure collector 114 in a communication manner, so as to receive the air pressure data in the air pressure collection box 111 collected by the first air pressure collector 113 and the air pressure data in the air pressure collection box 111 outside the air pressure collection box 111 collected by the second air pressure collector 114. The data processing unit 122 in the alarm device 120 processes the two sets of air pressure data received by the data receiving unit 121, and determines whether the battery system 10 is in a unstable state according to the result of the processing.
Specifically, please refer to fig. 6, which is a flowchart illustrating the sub-steps included in step S320 in fig. 5. In an embodiment of the present invention, the step S320 may include:
in sub-step S321, the air pressure data in the air pressure collection box 111 received by the alarm device 120 is subtracted from the air pressure data in the corresponding airtight space outside the air pressure collection box 111, so as to obtain the absolute value of the corresponding air pressure difference.
In this embodiment, the data processing unit 122 performs subtraction operation on the air pressure data in the air pressure collecting box 111 received by the data receiving unit 121 and two sets of air pressure data corresponding to the air pressure data in the airtight space outside the air pressure collecting box 111 to obtain a corresponding air pressure difference value, and then performs absolute value operation on the air pressure difference value to obtain an absolute value of the corresponding air pressure difference value.
Substep S322, comparing the absolute value of the air pressure difference with the preset air pressure value stored in the alarm device 120, and determining whether the battery system 10 is in a unstable state according to the comparison result.
In this embodiment, the memory 124 in the alarm device 120 may also store a preset air pressure value for determining whether the battery system 10 is in a unstable state. The preset air pressure value is greater than the absolute value of the maximum air pressure difference between the inside and the outside of the air pressure collection box 111 corresponding to the normal state of the battery system 10, and is smaller than the absolute value of the minimum air pressure difference between the inside and the outside of the air pressure collection box 111 corresponding to the unstable state of the battery system 10.
Specifically, please refer to fig. 7, which is a flowchart illustrating the sub-steps included in step S322 in fig. 6. In an embodiment of the present invention, the substep S322 may include:
substep S3221, when the absolute value of the air pressure difference value is smaller than the preset air pressure value, it is determined that the battery system 10 is in the normal state.
In this embodiment, when the battery system 10 is in a normal state, the bi-directional ventilation valve 112 may enable the air pressure collecting box 111 to exchange air with the air pressure collecting box 111 external sealing space, balance air pressures inside and outside the air pressure collecting box 111, and the air pressure data in the air pressure collecting box 111 external sealing space will tend to be consistent, and the absolute value of the corresponding air pressure difference will be smaller than the preset air pressure value. Therefore, when the absolute value of the air pressure difference value corresponding to the air pressure data collected by the air pressure collecting device 110 is smaller than the preset air pressure value, it may be determined that the battery system 10 is in a normal state.
Substep S3222, when the absolute value of the air pressure difference value is greater than the preset air pressure value, it is determined that the battery system 10 is in a unstable state.
In the present embodiment, when the battery system 10 is in a unstable state, the temperature in the closed space increases sharply, and the air pressure data of the closed space outside the air pressure collecting container 111 increases sharply accordingly. Because the air exchange rate of the bi-directional ventilation valve 112 is fixed, the air pressures inside and outside the air pressure collection box 111 cannot be balanced in time, and the air pressure data of the air pressure collection box 111 when the battery system 10 is in a unstable state is very small compared with the air pressure data of the air pressure collection box 111 when the battery system 10 is in a normal state, the air pressure data in the air pressure collection box 111 has very small change, and the absolute value of the corresponding air pressure difference value is larger than the preset air pressure value. Therefore, when the absolute value of the air pressure difference value corresponding to the air pressure data collected by the air pressure collecting device 110 is greater than the preset air pressure value, it may be determined that the battery system 10 is in a unstable state.
In step S330, when the alarm device 120 determines that the battery system 10 is in a unstable state, the alarm device 120 generates an alarm signal and sends out an alarm prompt to implement the detection of the instability of the battery system 10.
In the present embodiment, when the data processing unit 122 in the alarm device 120 determines that the battery system 10 is in a destabilizing system, the data processing unit 122 generates an alarm signal and sends the alarm signal to the alarm unit 123 in the alarm device 120. After receiving the alarm signal, the alarm unit 123 correspondingly sends out an alarm prompt to realize the real-time instability detection of the battery system 10, so as to avoid serious loss.
Fig. 8 is a schematic flow chart of a method for detecting instability of a battery system according to a preferred embodiment of the present invention. In an embodiment of the present invention, the method for detecting instability of a battery system may further include:
step S309, a preset air pressure value is set and stored in the alarm device 120.
In this embodiment, the preset air pressure value may be set at the alarm device 120 by a user or a manufacturer of the battery system instability detection apparatus 100, and stored in the memory 124.
In summary, in the battery system instability detection device and method provided by the preferred embodiment of the invention, the structure of the battery system instability detection device is simple, the manufacturing difficulty is low, the air pressure data in the air pressure acquisition box and the air pressure data in the airtight space outside the air pressure acquisition box can be acquired by the air pressure acquisition device, the acquired air pressure data are sent to the alarm device, the alarm device receives the air pressure data, judges whether the battery system is unstable or not according to the air pressure data, and alarms when judging the unstable state, thereby realizing real-time monitoring of the state of the battery system, sending an alarm prompt when the battery system is unstable, and avoiding serious loss.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The battery system comprises a first shell, a battery unit and a second shell, wherein the battery unit is arranged in a closed space formed by the first shell and the second shell;
the air pressure acquisition device is arranged in the closed space and comprises an air pressure acquisition box, a two-way ventilation valve, a first air pressure acquisition device and a second air pressure acquisition device;
the air pressure collecting box is of a closed cavity structure, and the bidirectional ventilation valve is arranged on one box body side surface of the air pressure collecting box, so that the air pressure collecting box can exchange air with a closed space outside the air pressure collecting box only through the bidirectional ventilation valve, and the speed of the air exchange by the bidirectional ventilation valve is fixed;
the first air pressure collector is arranged in the air pressure collecting box, the second air pressure collector is arranged outside the air pressure collecting box and is positioned in the closed space, the first air pressure collector and the second air pressure collector respectively collect air pressure data in the air pressure collecting box and air pressure data in the closed space outside the air pressure collecting box, and the collected air pressure data are sent to the alarm device;
the alarm device is arranged outside the closed space, receives the air pressure data, judges whether the battery system is unstable or not according to the air pressure data, and alarms when judging to be in an unstable state so as to realize the instability detection of the battery system.
2. The destabilizing detection device according to claim 1, characterized in that a gas exchange rate of the bidirectional ventilation valve when the battery system is in a normal state is equal to a gas exchange rate of the bidirectional ventilation valve when the battery system is in a destabilizing state.
3. The destabilizing detection device according to claim 1, wherein the first air pressure collector or the second air pressure collector includes an air pressure sensor for collecting air pressure data and a data transmission unit for transmitting data, the data transmission unit being electrically connected to the air pressure sensor to transmit the air pressure data collected by the air pressure sensor to the alarm device.
4. The apparatus according to claim 1, wherein the alarm device includes a data receiving unit for receiving air pressure data transmitted by the first air pressure collector and the second air pressure collector, a data processing unit for processing the air pressure data, and an alarm unit for giving an alarm prompt;
the data processing unit is electrically connected with the data receiving unit to process the air pressure data received by the data receiving unit and judge whether the battery system is in an unstable state according to the processing result;
the alarm unit is electrically connected with the data processing unit, so as to send out an alarm prompt when the data processing unit judges that the battery system is in a unsteady state.
5. The destabilizing detection device according to claim 1, characterized in that the air pressure collection box is fixed to the first housing inner wall or the second housing inner wall so that the air pressure collection box is fixed in the closed space.
6. The instability detection device of claim 1, wherein the sealing level of the enclosed space formed by the first housing and the second housing is not lower than the IP67 level.
7. A battery system instability detection method applied to the battery system instability detection apparatus according to any one of claims 1 to 6, characterized in that the instability detection method comprises:
the air pressure acquisition device acquires air pressure data in the air pressure acquisition box and air pressure data in a closed space outside the air pressure acquisition box, and sends the acquired air pressure data to the alarm device;
the alarm device receives the air pressure data sent by the air pressure acquisition device, processes the air pressure data and judges whether the battery system is in an unstable state according to a result obtained by processing;
when the alarm device judges that the battery system is in a destabilization state, the alarm device generates an alarm signal and sends out an alarm prompt so as to realize the destabilization detection of the battery system.
8. The method of claim 7, wherein the step of processing the air pressure data and determining whether the battery system is in a unstable state based on the result of the processing comprises:
subtracting the air pressure data in the air pressure acquisition box received by the alarm device from the air pressure data in the corresponding airtight space outside the air pressure acquisition box to obtain the absolute value of the corresponding air pressure difference value;
comparing the absolute value of the air pressure difference value with a preset air pressure value stored in the alarm device, and judging whether the battery system is in a destabilizing state according to a comparison result, wherein the preset air pressure value is larger than the absolute value of the maximum air pressure difference value inside and outside the air pressure acquisition box corresponding to the battery system in a normal state and smaller than the absolute value of the minimum air pressure difference value inside and outside the air pressure acquisition box corresponding to the battery system in the destabilizing state.
9. The method of claim 8, wherein the step of comparing the absolute value of the air pressure difference with a preset air pressure value stored in the alarm device and judging whether the battery system is in a unstable state according to the comparison result comprises:
when the absolute value of the air pressure difference value is smaller than the preset air pressure value, judging that the battery system is in a normal state;
and when the absolute value of the air pressure difference value is larger than the preset air pressure value, judging that the battery system is in a instable state.
10. The method of claim 7, further comprising:
and setting and storing a preset air pressure value in the alarm device.
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