Battery management system and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to a battery management system and electric equipment, and the battery management system comprises a micro-control chip, a battery sampling chip, at least one gas sensor, at least one signal processing module and at least one external action device; the battery sampling chip is connected with the battery pack, the battery sampling chip is connected with the gas sensor, a signal processing module is arranged between the battery sampling chip and the gas sensor, and the battery sampling chip is used for obtaining voltage signals of all batteries in the battery pack and signals collected by the gas sensor; the micro-control chip is connected with the battery sampling chip and an external action device, and the micro-control chip is used for controlling the state of the external action device according to the voltage signal and a signal collected by the gas sensor. The system complexity is reduced, the data synchronism is high, the battery state is analyzed, and the battery risk is warned in advance.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery management system and an electrical device. Background Art

[0002] Lithium battery energy storage applications are becoming more and more widespread. In order to ensure battery application safety and monitor battery operating status in real time, additional sensors are needed for corresponding monitoring.

[0003] In the prior art, information collection from sensors requires the design of a dedicated sampling controller for reading and processing, resulting in high system complexity and inflexibility. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a battery management system and power-consuming equipment, which are conducive to reducing system complexity and have high data synchronization, which is conducive to analyzing battery status and early warning of battery risks.

[0005] In a first aspect, an embodiment of the present disclosure provides a battery management system, comprising: a microcontroller chip, a battery sampling chip, at least one gas sensor, at least one signal processing module and at least one external action device; the battery sampling chip is connected to a battery pack, the battery sampling chip is connected to the gas sensor, and a signal processing module is provided between the battery sampling chip and the gas sensor, the battery sampling chip is used to obtain a voltage signal of each battery in the battery pack, and a signal collected by the gas sensor; the microcontroller chip is connected to the battery sampling chip, and the microcontroller chip is connected to the external action device, and the microcontroller chip is used to control the state of the external action device according to the voltage signal and the signal collected by the gas sensor.

[0006] In some embodiments, the gas sensor, signal processing module and battery sampling chip are integrated into the same circuit board; or, the battery sampling chip and signal processing module are integrated into the same circuit board, the gas sensor is located outside the circuit board where the battery sampling chip is located, and the signal processing module and the gas sensor are connected via a wiring harness.

[0007] In some embodiments, the battery sampling chip includes a power conversion module, and the power conversion module is used to provide power supply for the gas sensor.

[0008] In some embodiments, the battery pack includes a plurality of batteries connected in series; the battery sampling chip includes an amplifier corresponding to the battery, the positive electrode of the battery is connected to the positive power supply terminal of the amplifier corresponding thereto, the negative electrode of the battery is connected to the negative power supply terminal of the amplifier corresponding thereto, and the output terminal of the amplifier is connected to the signal conversion module in the battery sampling chip; a filtering circuit is arranged between the battery and the battery sampling chip.

[0009] In some embodiments, the battery sampling chip includes a transistor corresponding to the battery, the positive electrode of the battery is connected to the drain of the corresponding transistor, and the negative electrode of the battery is connected to the source of the corresponding transistor; a first resistor is provided between the positive electrode of the battery and the drain of the corresponding transistor, and between the negative electrode of the battery and the source of the corresponding transistor.

[0010] In some embodiments, the battery management system also includes a temperature sampling circuit, which includes a thermistor, a second resistor and a first capacitor, the first end of the second resistor is connected to the reference voltage interface of the battery sampling chip, the second end of the second resistor is connected to the temperature sampling interface of the battery sampling chip, the second end of the second resistor is connected to the first end of the thermistor, the second end of the thermistor is connected to the ground signal of the battery pack, and the two ends of the first capacitor are respectively connected to the first end of the second resistor and the second end of the thermistor.

[0011] In some embodiments, the battery management system further includes a bridge chip connected between the battery sampling chip and the microcontroller chip.

[0012] In some embodiments, the battery sampling chip, the bridge chip and the microcontroller chip are integrated into the same circuit board; or, the bridge chip and the microcontroller chip are integrated into the same circuit board, and the battery sampling chip is integrated into another circuit board.

[0013] In some embodiments, the battery management system further includes a control circuit connected between the microcontroller chip and the external action device.

[0014] In a second aspect, the present disclosure further provides an electrical device, including the battery management system provided by the present disclosure.

[0015] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0016] In the battery management system provided by the present disclosure, the battery sampling chip is connected to the battery pack, and the battery sampling chip can obtain the voltage signal of each battery in the battery pack. The battery sampling chip is also connected to the gas sensor, and a signal processing module is provided between the battery sampling chip and the gas sensor, so that the signal collected by the gas sensor is transmitted to the battery sampling chip after being processed by the corresponding signal processing module, so that the battery sampling chip can obtain the signal collected by the gas sensor, thereby eliminating the need to set up a sampling controller to read and process the signal collected by the gas sensor, which is conducive to simplifying the complexity of the system and making it more flexible to use. In addition, the battery sampling chip can obtain the signal collected by the gas sensor while obtaining the voltage signal of each battery in the battery pack, and the data synchronization is high, which is conducive to analyzing the battery status and early warning of battery risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 is a structural schematic diagram of a battery management system provided by the present disclosure;

[0020] Figure 2 is a circuit diagram of a battery management system provided by the present disclosure;

[0021] Figure 3 It is a connection circuit diagram of the gas sensor and the battery sampling chip provided by the present disclosure;

[0022] Figure 4 is another connection circuit diagram of the gas sensor and the battery sampling chip provided by the present disclosure;

[0023] Figure 5 It is a connection circuit diagram between the battery sampling chip and the battery provided by the present disclosure;

[0024] Figure 6 is another connection circuit diagram of the battery sampling chip and the battery provided by the present disclosure;

[0025] Figure 7 It is a connection circuit diagram of a battery sampling chip and a temperature sampling circuit provided by the present disclosure;

[0026] Figure 8 It is a connection circuit diagram of the battery sampling chip and the microcontroller chip provided by the present disclosure;

[0027] Fig. 9 is another circuit diagram of the battery management system provided by the present disclosure;

[0028] Fig.10 It is a connection circuit diagram between the microcontroller chip provided by the present disclosure and an external action device;

[0029] Fig.11 It is a structural block diagram of an electrical device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0032] Figure 1 This is a schematic diagram of the structure of a battery management system provided by the present disclosure, referring to Figure 1 , this embodiment provides a battery management system, including: a microcontroller chip 10, a battery sampling chip 20, at least one gas sensor 30, at least one signal processing module 40 and at least one external action device 50;

[0033] The battery sampling chip 20 is connected to the battery pack, and the battery sampling chip 20 is connected to the gas sensor 30, and a signal processing module 40 is provided between the battery sampling chip 20 and the gas sensor 30. The battery sampling chip 20 is used to obtain the voltage signal of each battery in the battery pack and the signal collected by the gas sensor 30;

[0034] The microcontroller chip 10 is connected to the battery sampling chip 20 , and the microcontroller chip 10 is connected to the external action device 50 . The microcontroller chip 10 is used to control the state of the external action device 50 according to the voltage signal and the signal collected by the gas sensor 30 .

[0035] Specifically, in the battery management system provided by the embodiment of the present disclosure, the battery sampling chip 20 is connected to the battery pack, and the battery sampling chip 20 can obtain the voltage signal of each battery in the battery pack. The battery sampling chip 20 is also connected to the gas sensor 30, and a signal processing module 40 is provided between the battery sampling chip 20 and the gas sensor 30, so that the signal collected by the gas sensor 30 is processed by the corresponding signal processing module 40 and transmitted to the battery sampling chip 20, so that the battery sampling chip 20 can obtain the signal collected by the gas sensor 30, so that there is no need to set up a sampling controller to read and process the signal collected by the gas sensor 30, which is conducive to simplifying the complexity of the system and making it more flexible to use. In addition, the battery sampling chip 20 can obtain the signal collected by the gas sensor 30 while obtaining the voltage signal of each battery in the battery pack, and the data synchronization is high, which is conducive to analyzing the battery status and early warning of battery risks.

[0036] The microcontroller chip 10 is connected to the battery sampling chip 20, and the microcontroller chip 10 is connected to the external action device 50. After the microcontroller chip 10 obtains the voltage signal of the battery in the battery pack and the signal collected by the gas sensor 30, it can calculate the state of the battery according to the signal and the preset algorithm, and then can interact with the external action device 50 for signal control. When the battery safety limit is reached, the corresponding protection strategy can be activated, such as stopping the use of the battery, turning on the external action device 50, etc., and then the battery state is processed to restore the battery to a safe state.

[0037] Optionally, the gas sensor 30 may include aerogel, hydrogen, carbon monoxide, air pressure, fire protection, high voltage interlock, etc. The signal types collected by the gas sensor 30 include but are not limited to analog, digital, PWM, sinusoidal voltage or current, etc.

[0038] Optionally, the signal processing module 40 can filter, amplify, reduce, transform, and perform other signal processing on the signal collected by the gas sensor 30, and transmit the processed signal to the battery sampling chip 20, thereby improving the accuracy of the signal collected by the gas sensor 30, and further improving the accuracy of the battery status analysis. The battery sampling chip 20 supports the collection of analog signals, supports the reading of digital signals, and supports the collection of waveforms such as PWM.

[0039] Optionally, the microcontroller chip 10 may be an MCU control chip or a SOC control chip. Of course, in other embodiments of the present disclosure, the microcontroller chip 10 may also be other control chips.

[0040] Figure 2 is a circuit diagram of a battery management system provided by the present disclosure, Figure 3 This is a connection circuit diagram of the gas sensor and the battery sampling chip provided by the present disclosure, refer to Figure 2 and Figure 3 In some optional embodiments, the gas sensor 30, the signal processing module 40 and the battery sampling chip 20 are integrated into the same circuit board.

[0041] Specifically, the gas sensor 30 is designed to be integrated with the battery sampling chip 20, that is, the gas sensor 30 is directly installed on the circuit board where the battery sampling chip 20 is located, to avoid interference caused by long-distance transmission. The battery sampling chip 20 is usually designed as a whole with the battery pack, so the gas sensor 30 can also be designed as an integrated whole with the battery pack to collect the battery status nearby, which is conducive to early warning of battery risks.

[0042] Optionally, when the battery sampling chip 20 is in use, it is necessary to take into account the needs of the gas sensor 30 and be installed in a place that is convenient for collecting sensor signals. For example, if it is a sensor that collects aerogel ejected when a battery fails, then the entire battery sampling chip 20 and battery system design must consider that the aerogel ejection can be effectively and quickly transmitted to the sensor area, so that the sensor can identify the battery status as soon as possible.

[0043] Figure 4 is another connection circuit diagram of the gas sensor and the battery sampling chip provided by the present disclosure, refer to Figure 2 and Figure 4 In some optional embodiments, the battery sampling chip 20 and the signal processing module 40 are integrated into the same circuit board, the gas sensor 30 is located outside the circuit board where the battery sampling chip 20 is located, and the signal processing module 40 and the gas sensor 30 are connected via a wiring harness 60.

[0044] Specifically, the gas sensor 30 is located outside the circuit board where the battery sampling chip 20 is located, that is, the gas sensor 30 can be arranged separately from the battery sampling chip 20, which is conducive to arranging the gas sensor 30 in an effective area for signal acquisition. At this time, the signal processing module 40 and the gas sensor 30 can be connected by a wiring harness 60 to realize signal transmission.

[0045] Specifically, the signal collected by the gas sensor 30 is processed by the corresponding signal processing module 40, and the processed signal is introduced into the signal conversion module in the battery sampling chip 20 through the GPIO0 interface of the battery sampling chip 20 for signal conversion, and the converted signal is transmitted to the microcontroller chip 10. Exemplarily, when the signal collected by the gas sensor 30 is an analog signal, the signal conversion module in the battery sampling chip 20 can convert it into a digital signal. Of course, in other embodiments of the present disclosure, the signal collected by the gas sensor 30 can also be other signals, and accordingly, the signal conversion module in the battery sampling chip 20 can also convert other signals into digital signals, which will not be described in detail in this embodiment.

[0046] Optional, Figure 3 and Figure 4 The signal processing module 40 is exemplarily shown as a filter circuit, so that the signal processing module 40 can filter the signal to avoid interference from the transmission line. It should be noted that in other embodiments of the present disclosure, the signal processing module 40 can also be other filter circuits. Of course, the signal processing module 40 can also be other signal processing modules such as amplification, reduction, and transformation, which will not be described in detail in this embodiment.

[0047] Optionally, power and other signals may be transmitted to the gas sensor 30 through the wiring harness 60 , so that the gas sensor 30 can operate.

[0048] Continue to refer Figure 2 In some optional embodiments, the battery sampling chip 20 includes a power conversion module, and the power conversion module is used to provide a power supply VCC for the gas sensor 30.

[0049] Specifically, the positive electrode P+ of the battery pack is connected to the BAT interface of the battery sampling chip 20. The battery sampling chip 20 includes a power conversion module, so that the LDOIN interface of the battery sampling chip 20 can stably output the power supply VCC. The power supply VCC can provide power for the gas sensor 30, thereby realizing the operation of the gas sensor 30.

[0050] Figure 5 This is a connection circuit diagram of the battery sampling chip and the battery provided by the present disclosure, refer to Figure 2 and Figure 5 , in some optional embodiments, the battery pack includes a plurality of batteries connected in series;

[0051] The battery sampling chip 20 includes an amplifier D corresponding to the battery, the positive electrode of the battery is connected to the positive power supply terminal of the amplifier D corresponding thereto, the negative electrode of the battery is connected to the negative power supply terminal of the amplifier D corresponding thereto, and the output terminal of the amplifier D is connected to the signal conversion module in the battery sampling chip 20;

[0052] A filter circuit 70 is provided between the battery and the battery sampling chip 20 .

[0053] Specifically, in the battery pack, batteries Cell1 to Celln are connected in series, P- is the negative electrode of battery Cell1, and P+ is the positive electrode of battery Celln, that is, P+ and P- are the positive and negative electrodes of the battery pack, and P+ and P- serve as power supplies for the battery sampling chip 20, that is, the battery sampling chip 20 draws power from the battery pack.

[0054] The interfaces C0-Cn of the battery sampling chip 20 are connected to each battery in the battery pack, so that the interfaces C0-Cn of the battery sampling chip 20 can be used to realize the voltage sampling input of the battery, and can collect the series voltage of n batteries in the battery pack. After the battery sampling chip 20 collects the voltage signal of the battery, the battery voltage signal is input into the internal signal conversion module, which is converted into a digital signal by the signal conversion module.

[0055] A filter circuit 70 is provided between the battery and the battery sampling chip 20 to avoid interference from the transmission line.

[0056] Optionally, the filtering circuit 70 includes two resistors and a capacitor, the two ends of the capacitor are respectively connected to the positive electrode and negative electrode of the corresponding battery, and a resistor is provided between the capacitor and the positive electrode of the corresponding battery and between the capacitor and the negative electrode of the corresponding battery.

[0057] Exemplary, reference Figure 5 The positive electrode of the battery Celln is connected to the positive power supply terminal of the corresponding amplifier D through the interface Cn of the battery sampling chip 20, and the negative electrode of the battery Celln is connected to the negative power supply terminal of the corresponding amplifier D through the interface Cn-1 of the battery sampling chip 20. The output terminal of the amplifier D is connected to the signal conversion module in the battery sampling chip 20. The filtering circuit 70 includes two resistors R Cn , R Cn-1 and a capacitor C Cn , capacitor C Cn The two ends of the capacitor C are connected to the positive and negative electrodes of the battery Celln respectively. Cn A resistor R is set between the positive electrode of the battery Celln Cn , capacitor C Cn A resistor R is set between the negative electrode of the battery Celln Cn-1 .

[0058] It should be noted that the present embodiment exemplarily shows that the filter circuit 70 includes two resistors and one capacitor. In other embodiments of the present disclosure, the filter circuit 70 may also be other circuit structures, which will not be described in detail in the present disclosure.

[0059] It should be noted that the number of batteries in the battery pack can be set according to actual needs, and the present disclosure does not make any specific limitation on this.

[0060] Optionally, a plurality of signal conversion modules are provided in the battery sampling chip 20, and different signals are converted by different signal conversion modules. Alternatively, a signal conversion module may be provided, and the signal conversion module includes a plurality of signal conversion units, and different signals are converted by different signal conversion units.

[0061] Figure 6 is another connection circuit diagram between the battery sampling chip and the battery provided by the present disclosure, refer to Figure 2 and Figure 6 In some optional embodiments, the battery sampling chip 20 includes a transistor M corresponding to the battery, the positive electrode of the battery is connected to the drain of the corresponding transistor M, and the negative electrode of the battery is connected to the source of the corresponding transistor M;

[0062] A first resistor is provided between the positive electrode of the battery and the drain electrode of the corresponding transistor M, and between the negative electrode of the battery and the source electrode of the corresponding transistor M.

[0063] Specifically, the interfaces B0-Bn of the battery sampling chip 20 are connected to each battery in the battery pack, and each battery in the battery pack and its corresponding transistor M and the first resistor therebetween form a discharge balancing loop. When the transistor M is turned on, the corresponding battery discharges through the two first resistors to reduce the power.

[0064] After the battery sampling chip 20 collects the voltage signal of each battery, the signal is transmitted to the microcontroller chip 10. After the microcontroller chip 10 obtains the voltage signal of the battery in the battery pack, it can calculate the state of the battery according to the signal and the preset algorithm, and then interact with the transistor M in the microcontroller chip 10. When the voltage of a battery is too high, the corresponding transistor M is controlled to be turned on, thereby realizing discharge to reduce the power.

[0065] Exemplary, reference Figure 6 The positive electrode of the battery Celln is connected to the drain of the corresponding transistor M through the interface Bn of the battery sampling chip 20, and the negative electrode of the battery Celln is connected to the source of the corresponding transistor M through the interface Bn-1 of the battery sampling chip 20. A first resistor R is provided between the transistor M and the positive electrode of the battery Celln. Bn A resistor R is provided between the transistor M and the negative electrode of the battery Celln. Bn-1 .

[0066] Figure 7 This is a connection circuit diagram of the battery sampling chip and the temperature sampling circuit provided by the present disclosure, refer to Figure 2 and Figure 7 In some optional embodiments, the battery management system further includes a temperature sampling circuit 80, which includes a thermistor NTC, a second resistor R GPIOn and the first capacitor C ref , the second resistor R GPIOn The first end is connected to the reference voltage interface V of the battery sampling chip 20 ref Connect the second resistor R GPIOn The second end of the second resistor R GPIOn The second end of the first capacitor C is connected to the first end of the thermistor NTC, the second end of the thermistor NTC is connected to the ground signal GND_B of the battery pack, and the ref The two ends of the second resistor R GPIOn The first end of the thermistor NTC is connected.

[0067] Specifically, the reference voltage interface V of the battery sampling chip 20 ref The output reference voltage, the resistance value of the thermistor NTC decreases as the temperature increases, and the second resistor R GPIOn is a high-precision resistor, so the thermistor NTC and the second resistor R GPIOn and the first capacitor C refA high-precision conversion circuit is constructed to convert the thermistor NTC input signal into a voltage signal. The temperature sampling interface GPIOn of the battery sampling chip 20 collects the corresponding voltage signal and converts it into a digital signal through the signal conversion module in the battery sampling chip 20, thereby realizing temperature sampling. The battery status can be further analyzed according to the temperature signal to provide early warning of battery risks.

[0068] Figure 8 This is a connection circuit diagram of the battery sampling chip and the microcontroller chip provided by the present disclosure, refer to Figure 2 and Figure 8 In some optional embodiments, the battery management system further includes a bridge chip 90 , which is connected between the battery sampling chip 20 and the microcontroller chip 10 .

[0069] Specifically, daisy chain communication can be adopted between the battery sampling chip 20 and the microcontroller chip 10. The daisy chain is transmitted in an isolated manner. The ground signal on the battery sampling chip 20 side is GND_B, which is the battery ground. The ground signal on the microcontroller chip 10 side is GND_D, which is the low voltage ground. High and low voltage isolation is achieved through isolation. When the microcontroller chip 10 does not have daisy chain communication, a bridge chip 90 can be provided. The bridge chip 90 is connected between the battery sampling chip 20 and the microcontroller chip 10. The microcontroller chip 10 can read the information of the battery sampling chip 20 through the daisy chain after conversion by the bridge chip 90. Of course, the communication mode between the battery sampling chip 20 and the microcontroller chip 10 is not limited to the daisy chain, but can also be SPI, I2C, CAN, 485, etc., which will not be described in detail in this disclosure.

[0070] Optionally, the microcontroller chip 10 can be connected to the bridge chip 90 via conventional communications such as SPI and I2C, preferably SPI. The bridge chip 90 can be directly connected to the battery sampling chip 20 via a daisy chain, or it can be connected to the battery sampling chip 20 after electromagnetic or photoelectric signal isolation, and electromagnetic isolation is preferred. Among them, the selection of isolation can improve high and low voltage safety. Of course, in other embodiments of the present disclosure, the microcontroller chip 10 can also directly read the information of the battery sampling chip 20 through a daisy chain, which will not be repeated in this disclosure.

[0071] Continue to refer Figure 2 and Figure 8 In some optional embodiments, the battery sampling chip 20, the bridge chip 90 and the microcontroller chip 10 are integrated into the same circuit board.

[0072] Specifically, the battery management system can adopt a single-board design, that is, the battery sampling chip 20, the bridge chip 90 and the microcontroller chip 10 are integrated into the same circuit board, which has a simple design structure, requires fewer components, has high reliability and good space utilization.

[0073] Fig. 9 is another circuit diagram of the battery management system provided by the present disclosure, referring to Fig. 9 In some optional embodiments, the bridge chip 90 and the microcontroller chip 10 are integrated into the same circuit board, and the battery sampling chip 20 is integrated into another circuit board.

[0074] Specifically, the battery management system can adopt a multi-board design, that is, the bridge chip 90 and the microcontroller chip 10 are integrated into the same circuit board, the battery sampling chip 20 and the microcontroller chip 10 are integrated into different circuit boards, and the battery sampling chip 20 and the bridge chip 90 are connected via a communication line. Optionally, the battery sampling chip 20 and the bridge chip 90 can be connected via a shielded twisted pair cable.

[0075] The multi-board design can achieve higher safety isolation of high and low voltages. The battery sampling chip 20 can be arranged near the battery to improve the reliability of battery protection, and the arrangement is more flexible.

[0076] Fig.10 This is a connection circuit diagram of the microcontroller chip and the external action device provided by the present disclosure, referring to Figure 2 and Fig.10 In some optional embodiments, the battery management system further includes a control circuit 51 , which is connected between the microcontroller chip 10 and the external action device 50 .

[0077] Specifically, a control circuit 51 is provided between the microcontroller chip 10 and the external action device 50, and the control circuit 51 includes a resistor R1, a resistor R2, a capacitor C1, a controller Q1 and a diode D1. Among them, the resistor R1 and the capacitor C1 form a filter circuit to avoid interference affecting the stability of the external output signal. The resistor R1 and the resistor R2 constitute a voltage divider circuit to limit the control voltage of the controller Q1 to prevent high voltage from damaging the controller Q1. The controller Q1 serves as the main control device. After the controller Q1 is turned on, the external action device 50 is started. When the controller Q1 is turned off, it has no effect on the external action device 50. The diode D1 is used for the external action device 50 to carry out freewheeling to avoid damage to the controller Q1.

[0078] After the microcontroller chip 10 obtains the data of the gas sensor 30 collected by the battery sampling chip 20, it first converts the collected signal into actual information, and then the built-in algorithm will obtain the true state of the gas sensor 30 according to the actual signal value of the gas sensor 30, as well as the preset upper and lower limits and control logic, thereby calculating the actual state and risk of the battery. For the predicted battery risk, the microcontroller chip 10 will activate the corresponding safety protection mechanism, such as giving an alarm signal for the corresponding risk, and activating external action devices 50 such as fire protection for the battery fire.

[0079] Optionally, the external action device 50 is generally externally arranged, and data transmission and control can be performed between the control circuit 51 and the external action device 50 via an external wiring harness.

[0080] Optionally, the external action device 50 and the external wiring harness may be isolated by a relay K1. Of course, in other embodiments of the present disclosure, the relay K1 may be removed as required to directly connect the external wiring harness to the external action device 50. This disclosure will not be repeated here.

[0081] The present disclosure also provides a control method for a battery management system, which is applied to the battery management system provided by the present disclosure. The control method includes:

[0082] Step S1, the system is powered on to provide normal working power for the microcontroller chip, battery sampling chip and gas sensor, etc.;

[0083] Step S2, the microcontroller chip software starts, and after normal startup, it goes to step S3;

[0084] Step S3, the microcontroller chip starts a self-checking procedure, including checking the battery pack, the microcontroller chip itself, the battery sampling chip, the communication between the two, and the gas sensor status, and after confirming that everything is correct, starts step S4;

[0085] Step S4, sending configuration information to the battery sampling chip, including configuring the chip working mode, the number of sampling channels of the battery voltage, temperature and sensor, channel number, sampling frequency, etc. for corresponding configuration;

[0086] Step S5, the configured battery sampling chip starts working according to the configured state;

[0087] Step S6, the microcontroller chip reads the battery sampling chip data through communication;

[0088] Step S7, the microcontroller chip converts the sampled values ​​read into actual values ​​according to the respective functional modules, and different sensors correspond to different conversion formulas;

[0089] Step S8, bringing the sensor information into the safety control algorithm to calculate the battery safety status;

[0090] Step S9, when the battery safety limit is reached, the corresponding protection strategy is activated, such as stopping the use of the battery, turning on external action devices such as fire protection;

[0091] Step S10: When the battery status is normal, jump to step S6 and continue working.

[0092] Please refer to Fig.11 , Fig.11 is a structural block diagram of an electrical device provided by an embodiment of the present disclosure. Fig.11 As shown, the power-consuming device 1000 provided in this embodiment includes a battery management system 100, wherein the battery management system 100 is the battery management system described in the above-mentioned embodiments. Figure 1-Figure 10 The description of the battery management system and specific components of the battery management system in the illustrated embodiment also has corresponding beneficial effects, and will not be repeated here to avoid repeated description.

[0093] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0094] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0095] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0096] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery management system, characterized in that: include: A microcontroller chip, a battery sampling chip, at least one gas sensor, at least one signal processing module and at least one external action device; The battery sampling chip is connected to the battery pack, the battery sampling chip is connected to the gas sensor, and the signal processing module is arranged between the battery sampling chip and the gas sensor, and the battery sampling chip is used to obtain the voltage signal of each battery in the battery pack and the signal collected by the gas sensor; The microcontrol chip is connected to the battery sampling chip, and the microcontrol chip is connected to the external action device. The microcontrol chip is used to control the state of the external action device according to the voltage signal and the signal collected by the gas sensor.

2. The battery management system according to claim 1, characterized in that: The gas sensor, the signal processing module and the battery sampling chip are integrated on the same circuit board; Alternatively, the battery sampling chip and the signal processing module are integrated into the same circuit board, the gas sensor is located outside the circuit board where the battery sampling chip is located, and the signal processing module is connected to the gas sensor via a wiring harness.

3. The battery management system according to claim 1, characterized in that: The battery sampling chip includes a power conversion module, and the power conversion module is used to provide power supply for the gas sensor.

4. The battery management system according to claim 1, characterized in that: The battery pack includes a plurality of batteries connected in series; The battery sampling chip includes an amplifier corresponding to the battery, the positive electrode of the battery is connected to the positive power supply terminal of the amplifier corresponding thereto, the negative electrode of the battery is connected to the negative power supply terminal of the amplifier corresponding thereto, and the output terminal of the amplifier is connected to the signal conversion module in the battery sampling chip; A filter circuit is arranged between the battery and the battery sampling chip.

5. The battery management system according to claim 4, characterized in that: The battery sampling chip includes a transistor corresponding to the battery, the positive electrode of the battery is connected to the drain electrode of the corresponding transistor, and the negative electrode of the battery is connected to the source electrode of the corresponding transistor; A first resistor is provided between the positive electrode of the battery and the drain electrode of the corresponding transistor, and between the negative electrode of the battery and the source electrode of the corresponding transistor.

6. The battery management system according to claim 1, characterized in that: The battery management system also includes a temperature sampling circuit, which includes a thermistor, a second resistor and a first capacitor, wherein the first end of the second resistor is connected to the reference voltage interface of the battery sampling chip, the second end of the second resistor is connected to the temperature sampling interface of the battery sampling chip, the second end of the second resistor is connected to the first end of the thermistor, the second end of the thermistor is connected to the ground signal of the battery pack, and the two ends of the first capacitor are respectively connected to the first end of the second resistor and the second end of the thermistor.

7. The battery management system according to claim 1, characterized in that: The battery management system further comprises a bridge chip, and the bridge chip is connected between the battery sampling chip and the microcontroller chip.

8. The battery management system according to claim 7, characterized in that: The battery sampling chip, the bridge chip and the microcontroller chip are integrated into the same circuit board; Alternatively, the bridge chip and the microcontroller chip are integrated into the same circuit board, and the battery sampling chip is integrated into another circuit board.

9. The battery management system according to claim 1, characterized in that: The battery management system further comprises a control circuit, and the control circuit is connected between the microcontroller chip and the external action device.

10. An electrical device, characterized in that: A battery management system comprising any one of claims 1-9.

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