Energy storage battery safety monitoring device

Abstract

The utility model relates to a safety monitoring device for an energy storage battery. The device comprises a power supply module, an MCU module, a sensor module and a sensor working power supply module. And the MCU module is electrically connected with the power supply module. The sensor module is provided with at least one sensor array, the same sensor array comprises at least one sensor array, and each sensor array is composed of at least two identical MEMS gas sensors. The sensor working power supply module is provided with at least one voltage regulation circuit, the input end of the voltage regulation circuit is electrically connected with the MCU module and the power supply module, and the output end of a single voltage regulation circuit is electrically connected with at least one sensor array of the same kind. Redundant backup is achieved by forming a sensor array, and safety monitoring reliability is improved. Meanwhile, the attenuation and the compensation amount of the MEMS gas sensor are controlled by adjusting the working voltage, and the working power supply of the sensor array is controlled to be turned on or turned off, so that the working duration of different sensor arrays of the same type is controlled, and the working life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety monitoring, in particular to a safety monitoring device for an energy storage battery. Background Art

[0002] Thermal runaway may occur in chemical energy storage batteries during operation. Thermal runaway is a chain reaction phenomenon caused by internal faults or external factors, which will cause the battery structure to be destroyed and the temperature to rise rapidly, and may eventually cause the battery to burn or explode. Therefore, it is necessary to monitor the safety of energy storage batteries. At present, the safety monitoring of energy storage lithium batteries is mainly carried out by monitoring the temperature changes inside the battery, the presence or absence of CO, H2, smoke / aerogel and other indicators. Among them, temperature monitoring can use thermocouples, NTC and other sensors, CO monitoring mainly uses electrochemical CO sensors, H2 monitoring mainly uses flat or catalytic H2 sensors, and smoke / aerogel mainly uses optical sensors. Existing CO and H2 gas sensors for lithium battery energy storage safety monitoring are mostly monopolized by foreign countries and are expensive and have limited production capacity. At the same time, the space left for the monitoring unit in the lithium energy storage battery pack is very small, and the existing sensors are large in size, which limits the types and combinations of sensors. Only a few of the most important sensors can be placed in the lithium energy storage battery pack for safety monitoring, and the layout position will also be limited by the internal space of the battery pack.

[0003] MEMS gas sensors are small in size and low in power consumption. If they are used in lithium battery energy storage safety monitoring, they can save the space and volume occupied by the monitoring unit, expand the types and combinations of sensors, and reduce monitoring costs. However, MEMS gas sensors are limited by their lifespan and attenuation. On the one hand, MEMS gas sensors cannot meet the lifespan requirements of 10 years or longer. On the other hand, MEMS gas sensors will have a tendency to continuously attenuate their response as the working time goes by. Therefore, it is difficult to actually apply them directly to lithium battery energy storage safety monitoring. Utility Model Content

[0004] The purpose of the utility model is to provide a safety monitoring device for an energy storage battery, which can realize redundant backup by adopting a plurality of identical MEMS gas sensors to form a sensor array, thereby saving the installation space and volume of the detection device and improving the continuity and stability of safety monitoring; at the same time, it can control the attenuation and compensation amount of the MEMS gas sensor by adjusting the working voltage of the sensor array, and control the working power of the sensor array to be turned on or off, thereby controlling the working time of different sensor arrays of the same type, so that the same sensor arrays can work alternately to extend the working life of the MEMS gas sensor.

[0005] In order to achieve the above object, the utility model provides a storage battery safety monitoring device, comprising:

[0006] Power module;

[0007] An MCU module is electrically connected to the power module;

[0008] A sensor module, connected to the MCU module, for performing gas safety monitoring on the energy storage battery, provided with at least one sensor array, the same sensor array comprising at least one sensor array, each sensor array consisting of at least two identical MEMS gas sensors;

[0009] The sensor working power supply module is provided with at least one voltage regulating circuit, the input end of the voltage regulating circuit is electrically connected to the MCU module and the power supply module, and the output end of a single voltage regulating circuit is electrically connected to at least one sensor array of the same type.

[0010] Optionally, the voltage regulating circuit consists of an operational amplifier and a transistor electrically connected to the operational amplifier.

[0011] Optionally, the voltage regulation range of the voltage regulation circuit can be as low as 0V.

[0012] Optionally, the MCU module is provided with a DAC module, and an output end of the DAC module is electrically connected to an input end of the operational amplifier.

[0013] Optionally, the energy storage battery safety monitoring device also includes a low-pass filtering circuit, the MCU module is provided with a PWM module, the output end of the PWM module is electrically connected to the input end of the low-pass filtering circuit, and the output end of the low-pass filtering circuit is electrically connected to the input end of the operational amplifier.

[0014] Optionally, the energy storage battery safety monitoring device further includes:

[0015] The humidity and temperature monitoring module is electrically connected to the MCU module and the power module, and is used to monitor the humidity and temperature of the energy storage battery.

[0016] Optionally, the energy storage battery safety monitoring device further includes:

[0017] A communication module, electrically connected to the MCU module and the power module, and used for communicating with an external device;

[0018] The alarm module is electrically connected to the MCU module and the power module, and is used to send out a sound signal for alarm prompting.

[0019] Optionally, the power supply module includes a DC / DC module and an LDO module electrically connected to the DC / DC module.

[0020] The beneficial effects of the utility model are as follows: redundant backup is achieved by adopting a plurality of identical MEMS gas sensors to form a sensor array, thereby saving the installation space and volume of the detection device and improving the continuity and stability of safety monitoring; at the same time, by cooperating with the sensor array of the sensor module through the voltage regulation circuit of the sensor working power module, on the one hand, the attenuation and compensation amount of the MEMS gas sensor can be controlled by adjusting the working voltage of the sensor array, and on the other hand, the working power of the sensor array can be controlled to be turned on or off by adjusting the working voltage of the sensor array, thereby controlling the working time of different sensor arrays of the same type, so that the same sensor arrays can work alternately to extend the working life of the MEMS gas sensor.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic module diagram of a device for monitoring the safety of an energy storage battery according to an embodiment of the present utility model;

[0023] Figure 2 A schematic circuit structure diagram of a CO sensor array of an energy storage battery safety monitoring device shown in one embodiment of the utility model;

[0024] Figure 3 A schematic circuit structure diagram of an H2 sensor array of an energy storage battery safety monitoring device shown in one embodiment of the utility model;

[0025] Figure 4 A schematic circuit structure diagram of a first voltage regulating circuit of an energy storage battery safety monitoring device shown in one embodiment of the utility model;

[0026] Figure 5 A schematic circuit structure diagram of a second voltage regulating circuit of an energy storage battery safety monitoring device shown in one embodiment of the utility model;

[0027] Figure 6 A schematic circuit structure diagram of a humidity and temperature monitoring module of an energy storage battery safety monitoring device shown in one embodiment of the utility model;

[0028] In the figure: 1. power module; 11. DC / DC module; 12. LDO module; 2. MCU module; 3. sensor module; 31. sensor array; 4. sensor working power module; 41. voltage regulation circuit; 5. humidity and temperature monitoring module; 6. communication module; 7. alarm module. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] See also Figure 1A storage battery safety monitoring device shown in a preferred embodiment of the present application includes a power module 1, an MCU module 2, a sensor module 3 and a sensor working power module 41. The MCU module 2 is electrically connected to the power module 1. The sensor module 3 is connected to the MCU module 2 and is used to perform gas safety monitoring on the energy storage battery. At least one sensor array 31 is provided. The same sensor array 31 includes at least one sensor array 31, and each sensor array 31 is composed of at least two identical MEMS gas sensors. The sensor working power module 41 is provided with at least one voltage regulating circuit 41, the input end of the voltage regulating circuit 41 is electrically connected to the MCU module 2 and the power module 1, and the output end of a single voltage regulating circuit 41 is electrically connected to at least one sensor array 31 of the same type.

[0033] Since MEMS gas sensors have the advantages of small size and low power consumption, if their lifespan and attenuation problems can be solved, they can be applied to the safety monitoring of lithium battery energy storage. They can be placed closer to the battery cells in the battery pack to better detect battery cell leakage.

[0034] Therefore, according to the scheme of the embodiment of the utility model, the present application realizes redundant backup by forming a sensor array 31 with multiple identical MEMS gas sensors, which means that multiple MEMS gas sensors are backup for each other, while saving the installation space and volume of the detection device, improving the continuity and stability of safety monitoring (equivalent to extending the overall working life of the sensor module 3); at the same time, through the voltage regulation circuit 41 of the sensor working power module 41 in conjunction with the sensor array 31 of the sensor module 3, on the one hand, the working performance of the MEMS gas sensor can be affected by adjusting the working voltage of the sensor array 31, thereby controlling the attenuation and compensation amount of the MEMS gas sensor. On the other hand, by adjusting the working voltage of the sensor array 31, the working power of the sensor array 31 can be controlled to be turned on or off, thereby controlling the working time of different sensor arrays 31 of the same type, so that the same type of sensor arrays 31 can work alternately to extend the working life of the MEMS gas sensor.

[0035] Specifically, the voltage regulation range of the voltage regulation circuit 41 can be as low as 0V. Therefore, when the operating voltage of the sensor array 31 is adjusted to 0V, it is equivalent to turning off the working power of the sensor array 31, so that the working time of different sensor arrays 31 of the same type can be controlled.

[0036] The following is a detailed description with specific embodiments:

[0037] In this embodiment, the sensor module 3 includes at least one CO sensor array S5 (see Figure 2 ) and at least one H2 sensor array S6 (see Figure 3), the CO sensor array S5 integrates two MEMS CO sensor chips, and the H2 sensor array S6 integrates two MEMS H2 sensor chips. In practical applications, the types of sensor arrays 31, the number of sensor arrays 31 of the same type, and the number of MEMS gas sensors integrated in the same sensor array 31 can be arranged according to actual needs and are not limited here.

[0038] The voltage regulating circuit 41 is composed of an operational amplifier and a triode electrically connected to the operational amplifier. The MCU module 2 is provided with a DAC module, and the output end of the DAC module is electrically connected to the input end of the operational amplifier.

[0039] In this embodiment, the voltage regulating circuit 41 includes at least one first voltage regulating circuit (see Figure 4 ) and at least one second voltage regulating circuit (see Figure 5 ), a single first voltage regulating circuit can be electrically connected to a single or multiple CO sensor arrays S5. It should be noted here that when there is only one first voltage regulating circuit, the multiple MEMS gas sensors in the CO sensor array S5 that serve as backup for each other can extend the overall working life of the CO sensor array 31; when there are at least two first voltage regulating circuits, at least two first voltage regulating circuits are allocated and connected to multiple CO sensor arrays S5, so that alternating working switching between multiple CO sensor arrays S5 can be achieved, while ensuring that the CO gas safety monitoring function can operate continuously and stably, and extending the working life of the MEMS CO sensor chip. The electrical connection relationship between the second voltage regulating circuit and the H2 sensor array S6 is similar. Please refer to Figure 4 and Figure 5 The DAC module of the MCU module 2 outputs DAC signals DAC0 and DAC1 to the operational amplifiers U13 and U14 of the first voltage regulation circuit and the second voltage regulation circuit respectively. After adjusting the input voltage through the operational amplifier and the transistor, the voltages VCC_H1 and VCC_H2 are output to the CO sensor array S5 and the H2 sensor array S6 respectively.

[0040] Specifically, the voltage adjustable circuit can achieve a voltage adjustment range between 0-3.3V, with an adjustment step of about 1mV and a current of 500mA, which can match the different requirements of MEMS gas sensors for working voltage. The MCU module 2 adopts the STM32F407 chip, which integrates 1024KB Flash and 192KB SRAM, 12-bit 1Msps high-precision SARADC and DAC modules, and integrates rich communication peripherals such as comparators, operational amplifiers, built-in high-performance PWM timers, multiple UARTs, SPI, I2C, Ethernet interfaces, etc., and built-in AES, RNG and other information security modules, with the characteristics of high integration, high anti-interference and high reliability. The core adopts the Cortex-M4 core, with mature Keil&IAR debugging and development software, supporting C language and assembly language, assembly instructions.

[0041] In one embodiment, the energy storage battery safety monitoring device further includes a low-pass filter circuit, the MCU module 2 is provided with a PWM module, the output end of the PWM module is electrically connected to the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is electrically connected to the input end of the operational amplifier. Since the number of DAC modules provided by the MCU module 2 is limited, when the number of sensor arrays 31 actually required is large, the number of corresponding voltage regulating circuits 41 is also large, and the number of DAC modules cannot meet the demand, the PWM module can be used in conjunction with an external low-pass filter circuit to replace the DAC module to increase the number of voltage regulating circuits 41, thereby being able to match a larger number of sensor arrays 31.

[0042] See also Figure 1 The energy storage battery safety monitoring device also includes a humidity and temperature monitoring module 5, a communication module 6 and an alarm module 7. The humidity and temperature monitoring module 5 is electrically connected to the MCU module 2 and the power module 1, and is used to monitor the humidity and temperature of the energy storage battery. The communication module 6 is electrically connected to the MCU module 2 and the power module 1, and is used to communicate with external devices. The alarm module 7 is electrically connected to the MCU module 2 and the power module 1, and is used to send a sound signal for an alarm prompt.

[0043] Specifically, in this embodiment, the humidity and temperature monitoring module 5 adopts a digital temperature and humidity sensor of Sensirion (Switzerland Shengsrui), embedded with a double-row flat leadless SMD package suitable for reflow soldering, and the sensor outputs a calibrated digital signal in a standard I2C format. For reference circuits, please refer to Figure 6 The communication module 6 uses a commonly used CAN transceiver chip. The alarm module 7 uses a buzzer of model HY12-1P, and the driving voltage is 5V.

[0044] The power module 1 includes a DC / DC module 11 and an LDO module 12 electrically connected to the DC / DC module 11. Specifically, in this embodiment, the DC / DC module 11 uses a power management chip packaged as SOIC-8_EP_150mil, which supports an input of 4.0V to 28V, and an output current of up to 3A, and is adapted to the 24V working power supply commonly used in lithium battery energy storage. The LDO module 12 uses a low-voltage linear regulator (LDO) packaged as a SOT-89 (SOT-89-3) pin package, low noise, and an accuracy of 0.2%, which can convert 5V voltage into 3.3V and 2.5V, etc.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A storage battery safety monitoring device, characterized in that: include: Power module; An MCU module is electrically connected to the power module; A sensor module, connected to the MCU module, for performing gas safety monitoring on the energy storage battery, provided with at least one sensor array, the same sensor array comprising at least one sensor array, each sensor array consisting of at least two identical MEMS gas sensors; The sensor working power supply module is provided with at least one voltage regulating circuit, the input end of the voltage regulating circuit is electrically connected to the MCU module and the power supply module, and the output end of a single voltage regulating circuit is electrically connected to at least one sensor array of the same type.

2. The energy storage battery safety monitoring device according to claim 1, characterized in that: The voltage regulating circuit is composed of an operational amplifier and a triode electrically connected to the operational amplifier.

3. The energy storage battery safety monitoring device according to claim 2, characterized in that: The voltage regulation range of the voltage regulation circuit can be as low as 0V.

4. The energy storage battery safety monitoring device according to claim 3, characterized in that: The MCU module is provided with a DAC module, and the output end of the DAC module is electrically connected to the input end of the operational amplifier.

5. The energy storage battery safety monitoring device according to claim 3, characterized in that: The energy storage battery safety monitoring device also includes a low-pass filter circuit. The MCU module is provided with a PWM module. The output end of the PWM module is electrically connected to the input end of the low-pass filter circuit. The output end of the low-pass filter circuit is electrically connected to the input end of the operational amplifier.

6. The energy storage battery safety monitoring device according to claim 1, characterized in that: The energy storage battery safety monitoring device also includes: The humidity and temperature monitoring module is electrically connected to the MCU module and the power module, and is used to monitor the humidity and temperature of the energy storage battery.

7. The energy storage battery safety monitoring device according to claim 1, characterized in that: The energy storage battery safety monitoring device also includes: A communication module, electrically connected to the MCU module and the power module, and used for communicating with an external device; The alarm module is electrically connected to the MCU module and the power module, and is used to send out a sound signal for alarm prompting.

8. The energy storage battery safety monitoring device according to any one of claims 1 to 7, characterized in that: The power supply module includes a DC / DC module and an LDO module electrically connected to the DC / DC module.

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