Power battery detection alarm system

Abstract

The invention discloses a power battery detection and alarm system, and the system comprises a power conversion module which is used for the conversion of an external input power supply; the photoelectric isolation module is used for photoelectric isolation of communication signals; the main control module is used for analyzing the operation input signal and outputting an operation result signal; the communication module is used for sending an alarm signal to external equipment; the detection module is used for detecting the gas concentration and temperature of the ternary lithium power battery; the alarm module is used for sending out a photoelectric alarm; and the alarm selection module comprises an operation panel, an alarm output mode selection circuit, an alarm trigger concentration selection circuit, an alarm trigger temperature selection circuit and an alarm detection duration selection circuit, and is used for setting an alarm mode and an alarm value. Alarm values and alarm modes can be set according to different environments, external interference can be effectively reduced through different settings, and the false alarm rate is reduced. And a fault self-checking function is set, so that a user can find device faults as soon as possible.

Description

[0001] This application is a divisional application of patent number "2019109956935", application date "2019-10-18", and name "A ternary lithium power battery detection and alarm device". Technical Field

[0002] The present invention relates to the field of lithium power battery detection and alarm, and in particular to a power battery detection and alarm system. Background Art

[0003] With the changes in the country's "financial subsidy policy for new energy vehicles", ternary lithium power batteries have gradually replaced lithium iron phosphate and become the mainstream. The battery energy density and vehicle range have been greatly improved, but ternary lithium power batteries may cause thermal runaway. Thermal runaway means that the power battery will generate heat when working. When the battery temperature is too high or the charging voltage is too high, chemical reactions inside the battery will occur one after another, resulting in a chain reaction, causing the internal pressure and temperature of the battery to rise sharply, and then causing thermal runaway of the battery, explosion or combustion. New energy vehicles equipped with ternary lithium power battery detection devices can prevent serious consequences caused by thermal runaway, and users are safer when using them.

[0004] The existing ternary lithium power battery detection and alarm device mainly detects and alarms the temperature of the lithium power battery and the corresponding gas concentration, and generally has the following problems:

[0005] 1. The vehicle body and decorative materials will produce gases such as formaldehyde, xylene and benzene, which may trigger false alarms from the ternary lithium power battery detection alarm device;

[0006] 2. In a high temperature environment, the ternary lithium power battery detection alarm device may issue a false alarm, affecting the normal use of the user;

[0007] 3. When the car hood is opened briefly, the temporary increase in the concentration of external interference gas may trigger a false alarm;

[0008] 4. When the ternary lithium power battery detection alarm device fails, the car owner cannot discover it in time, which may cause serious consequences. Summary of the invention

[0009] In order to overcome the above-mentioned technical defects, the present invention provides a power battery detection alarm system, which can flexibly set multiple alarm values ​​and, including the setting of alarm mode, the setting of alarm temperature, the selection of alarm gas concentration and the setting of alarm delay, so as to be suitable for different usage environments; it also has a self-check function, which issues an alarm as soon as the power battery detection alarm system fails, reminding the user to repair or replace it in time.

[0010] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0011] A power battery detection alarm system, comprising:

[0012] A power conversion module, including a power conversion chip U1 and a power conversion circuit, wherein the power conversion chip U1 is connected to the power conversion circuit;

[0013] The photoelectric isolation module includes a photoelectric isolation chip U2 and a photoelectric isolation output circuit, wherein the photoelectric isolation chip U2 is connected to the photoelectric isolation output circuit;

[0014] The main control module includes a control chip U3 and a control circuit, wherein the control chip U3 is connected to the control circuit;

[0015] A communication module, including a communication chip U4 and a communication circuit, wherein the communication chip U4 is connected to the communication circuit;

[0016] The detection module includes a gas-sensitive detection circuit and a temperature detection circuit, wherein the gas-sensitive detection circuit is connected to the control chip U3, and the temperature detection circuit is connected to the control chip U3;

[0017] The alarm module includes a buzzer alarm circuit, an indicator light alarm circuit and a self-test signal output circuit, wherein the buzzer alarm circuit is connected to the control chip U3, the indicator light alarm circuit is connected to the control chip U3, and the self-test signal output circuit is connected to the control chip U3;

[0018] An alarm selection module, which is used to set an alarm mode and an alarm value, and the alarm selection module includes an operation panel, an alarm output mode selection circuit connected to the operation panel, an alarm trigger concentration selection circuit connected to the operation panel, an alarm trigger temperature selection circuit connected to the operation panel, and an alarm detection time selection circuit connected to the operation panel; the operation panel, which is used to set and display the alarm value, includes a display, a plurality of buttons, and a display / button circuit;

[0019] Wherein, the power conversion module is used to convert the external input power into the working power of the power battery detection alarm system;

[0020] The photoelectric isolation module is used to perform photoelectric isolation on the working power supply and communication signal of the communication module, the photoelectric isolation module is connected to the main control module, and the photoelectric isolation module is connected to the power conversion module;

[0021] The main control module is used to control the operation and self-check of the power battery detection alarm system, and the main control module is connected to the power conversion module;

[0022] The communication module is used to transmit the alarm signal to the external device, and the communication module is connected to the photoelectric isolation module;

[0023] The detection module is used to detect the temperature value and the concentration value of CO2, CO, H2, C2H4, CH4, C2H6 and C3H6 gases. The detection module is connected to the main control module, and the detection module is connected to the power conversion module;

[0024] The alarm module is used to convert the alarm signal received from the main control module into an audible and visual alarm and a self-test signal output, the alarm module is connected to the main control module, and the alarm module is connected to the power conversion module;

[0025] The alarm selection module is used to set the alarm value and alarm mode of the power battery detection alarm system, and the alarm selection module is connected to the main control module.

[0026] Preferably, the main control module is a single-chip microcomputer, and the control chip U3 is an atmega88pa chip; the control chip U3 includes pins 4, 6, 18 and 20, all of which are connected to the power conversion circuit; the control chip U3 includes pin 13 connected to the photoelectric isolation output circuit; the control chip U3 includes pin 14 connected to the buzzer alarm circuit; the control chip U3 includes pin 7 connected to the indicator light alarm circuit; the control chip U3 includes pin 8 connected to the self-test signal output circuit; the control chip U3 includes pin 25 connected to the gas-sensitive detection circuit; the control chip U3 includes pin 24 connected to the temperature detection circuit; the control chip U3 includes pin 32 connected to the alarm output mode selection circuit; the control chip U3 includes pin 1 connected to the alarm trigger temperature selection circuit; the control chip U3 includes pin 9 connected to the alarm trigger concentration selection circuit; the control chip U3 includes pin 10 connected to the alarm detection duration selection circuit;

[0027] Preferably, the power conversion chip U1 is a LM2596 chip; the power conversion circuit includes polar capacitor C1 and polar capacitor C2, capacitor C3 and capacitor C4, indicator LED1, pull-up resistor R1, diode D1, diode D2, diode D3, diode D4 and diode D5; pin 1 of the power conversion chip U1 is used to connect to an external input power supply, the positive electrode of the polar capacitor C2 is connected to pin 1 of the power conversion chip U1, and the negative electrode of the polar capacitor C2 is grounded; pin 4 of the power conversion chip U1 is connected to the control chip U3; one of the inductors L1 is connected to the control chip U3; The first end of the inductor L1 is connected to the No. 2 pin of the power conversion chip U1, the other end of the inductor L1 is connected to the positive electrode of the polarity capacitor C1, the negative electrode of the polarity capacitor C1 is grounded, the negative electrode of the diode D3 is connected to the No. 2 pin of the power conversion chip U1, and the positive electrode of the diode D3 is grounded; the No. 3 pin of the power conversion chip U1 is grounded; the No. 5 pin of the power conversion chip U1 is grounded; the positive electrode of the indicator light LED1 is connected to the No. 4 pin of the power conversion chip U1 through the pull-up resistor R1, the negative electrode of the indicator light LED1 is grounded, one end of the capacitor C4 is connected to the indicator light LED1, and the other end of the capacitor C4 is connected to the resistor R1.

[0028] Preferably, the photoelectric isolation chip U2 is a TLP521-1 chip; the photoelectric isolation output circuit includes a resistor R9, a capacitor C5, a composite diode D7 and a composite diode D8; pin 1 of the photoelectric isolation chip U2 is connected to the control chip U3 through the resistor R9; one end of the capacitor C5 is connected to pin 1 of the photoelectric isolation chip U2, and the other end of the capacitor C5 is connected to pin 2 of the photoelectric isolation chip U2; pin 2 of the photoelectric isolation chip U2 is grounded; one end of the composite diode D7 is connected to pin 3 of the photoelectric isolation chip U2, the other end of the composite diode D7 is connected to pin 4 of the photoelectric isolation chip U2, and the other end of the composite diode D7 is also connected to the composite diode D8; one end of the composite diode D8 is connected to pin 4 of the photoelectric isolation chip U2, the other end of the composite diode D8 is respectively connected to pin 3 of the photoelectric isolation chip U2, and the other end of the composite diode D8 is also connected to the composite diode D7.

[0029] Preferably, the buzzer alarm circuit includes a buzzer BUZI, an NPN transistor Q1, a resistor R8, a resistor R7, a resistor R31 and a capacitor C13; one end of the resistor R31 is connected to pin 1 of the buzzer BUZI, and the other end of the resistor R31 is connected to pin 2 of the buzzer BUZI; pin 2 of the buzzer BUZI is connected to a power conversion module, pin 1 of the buzzer BUZI is connected to the collector of the NPN transistor Q1, and the base of the NPN transistor Q1 is connected to pin 14 of the control chip U3 through the resistor R7; one end of the resistor R8 is connected to the base of the NPN transistor Q1, and the other end of the resistor R8 is grounded; one end of the capacitor C13 is connected to the base of the NPN transistor Q1, the other end of the capacitor C13 is grounded, and the emitter of the NPN transistor Q1 is grounded.

[0030] Preferably, the indicator light alarm circuit includes an indicator light LED2 and a pull-up resistor R19; the positive pole of the indicator light LED2 is connected to the power conversion module through the pull-up resistor R19, the pull-up resistor R19 makes the indicator light LED2 at a normal voltage, and the negative pole of the indicator light LED2 is connected to pin 7 of the control chip U3.

[0031] Preferably, the self-test signal output circuit includes a composite diode D6, a resistor R10, a resistor R20, a capacitor C6, a relay K1 and an NPN transistor Q2; the relay K1 includes a coil K1A, a switch K1B and a switch K1C; the positive electrode of the coil K1A is connected to an external input power supply, the negative electrode of the coil K1A is connected to the collector of the NPN transistor Q2, one end of the composite diode D6 is connected to the collector of Q2, the other end of the composite diode D6 is connected to the positive electrode of the coil K1A, and the NPN transistor Q 2 is connected to pin 8 of the control chip U3 through resistor R10, and the emitter of the NPN transistor Q2 is grounded; one end of the pull-down resistor R20 is connected to the base of the NPN transistor Q2, and the other end of the pull-down resistor R20 is grounded; one end of the capacitor C6 is connected to the base of the NPN transistor Q2, and the other end of the capacitor C6 is grounded; the control chip U3 performs self-test, and the control chip U3 transmits the self-test signal to the self-test signal output circuit, and the self-test signal is transmitted to the external device through the self-test signal output circuit.

[0032] Preferably, the gas-sensitive detection circuit includes a gas sensor SE1, a resistor R4, a resistor R5 and a capacitor C15; pin 2 of the gas sensor SE1 is connected to a power conversion module, pin 5 of the gas sensor SE1 is grounded through a pull-down resistor R5, pin 6 of the gas sensor SE1 is connected to pin 4 of the gas sensor SE1, pin 4 of the gas sensor SE1 is connected to pin 25 of the control chip U3, and pin 4 of the gas sensor SE1 is grounded through a pull-down resistor R4; one end of the capacitor C15 is connected to pin 4, and the other end of the capacitor C15 is grounded; pin 1 of the gas sensor SE1 is connected to pin 3 of the gas sensor SE1, and pin 3 of the gas sensor SE1 is connected to a power conversion module.

[0033] Preferably, the temperature detection circuit includes a temperature sensor RT1, a resistor R3, a resistor R6 and a capacitor C14; one end of the temperature sensor RT1 is connected to the power conversion module, the other end of the temperature sensor RT1 is connected to pin 24 of the control chip U3, and the other end of the temperature sensor RT1 is grounded through a pull-down resistor R6; one end of the resistor R3 is connected to one end of the temperature sensor RT1, and the other end of the resistor R3 is connected to the other end of the temperature sensor RT1; one end of the capacitor C14 is connected to the temperature sensor RT1, and the other end of the capacitor C14 is grounded.

[0034] Preferably, the alarm selection module also includes resistor R22, resistor R23, resistor R24 ​​and resistor R25; the alarm output mode selection circuit is connected to pin 32 of the control chip U3 through resistor R22; the alarm trigger temperature selection circuit is connected to pin 1 of the control chip U3 through resistor R23; the alarm trigger concentration selection circuit is connected to pin 9 of the control chip U3 through resistor R24; the alarm detection time selection circuit is connected to pin 10 of the control chip U3 through resistor R25.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The power battery detection alarm system described in the present invention is provided with an alarm selection module, which includes an alarm output mode selection circuit, an alarm trigger concentration selection circuit, an alarm trigger temperature selection circuit and an alarm detection time selection circuit. Each alarm value and alarm mode are selected by pressing buttons on the operation panel, and the display on the operation panel displays the code of the currently selected alarm mode and alarm value. The alarm output mode, gas concentration alarm value, ambient temperature alarm value and alarm delay value can be flexibly set according to different environments. The setting of different alarm values ​​and alarm modes can effectively reduce external interference and reduce the false alarm rate of the power battery detection alarm system, so that the power battery detection alarm system can be suitable for various environments.

[0037] The main control module of the power battery detection alarm system described in the present invention has a self-test function. The alarm module of the power battery detection alarm system includes a self-test signal output circuit. The self-test signal output circuit receives the self-test signal of the control chip U3 in real time. The self-test signal is amplified and transmitted to an external device. The external device can receive the current self-test result of the power battery detection alarm system in real time. When the power battery detection alarm system fails, the self-test signal output circuit will generate a self-test alarm, which will cause an alarm in the external device. The user can discover it in time, thereby greatly reducing the risk caused by the failure of the power battery detection alarm system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 It is a system structure block diagram of the power battery detection alarm system of the present invention;

[0040] Figure 2 It is the overall circuit principle diagram of the power battery detection alarm system of the present invention;

[0041] Figure 3 It is a schematic diagram of the power conversion circuit of the power battery detection alarm system of the present invention;

[0042] Figure 4 It is a schematic diagram of the photoelectric isolation output circuit of the power battery detection alarm system of the present invention;

[0043] Figure 5 It is a control circuit schematic diagram of the power battery detection alarm system of the present invention;

[0044] Figure 6 It is a schematic diagram of the buzzer alarm circuit of the power battery detection alarm system of the present invention;

[0045] Figure 7 This is a schematic diagram of the indicator light alarm circuit of the power battery detection alarm system of the present invention;

[0046] Figure 8 It is a schematic diagram of the self-test signal output circuit of the power battery detection alarm system of the present invention;

[0047] Fig. 9 It is a principle diagram of the gas-sensitive detection circuit of the power battery detection alarm system of the present invention;

[0048] Fig.10 It is a schematic diagram of the temperature detection circuit of the power battery detection alarm system of the present invention;

[0049] Fig.11It is a schematic diagram of the communication circuit of the power battery detection alarm system of the present invention;

[0050] In the figure: 1-power conversion circuit, 2-photoelectric isolation output circuit, 3-control circuit, 4-display / button circuit, 5-alarm detection time selection circuit, 6-alarm trigger concentration selection circuit, 7-alarm trigger temperature selection circuit, 8-alarm output mode selection circuit, 9-buzzer alarm circuit, 10-indicator light alarm circuit, 11-self-test signal output circuit, 12-gas sensitive detection circuit, 13-temperature detection circuit, 14-communication circuit. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0052] like Figure 1-2 As shown, the power battery detection and alarm system of the present invention includes: a power conversion module, a photoelectric isolation module, a main control module, a communication module, a detection module, an alarm module and an alarm selection module.

[0053] The power conversion module includes a power conversion chip U1 and a power conversion circuit 1, and the power conversion chip U1 is connected to the power conversion circuit 1. The power conversion circuit 1 is connected to an external input power supply, and the voltage is converted through the power conversion chip U1 to convert the external input power supply into a working power supply of the rated voltage of each component in the power battery detection alarm system, thereby providing a suitable working power supply for the power battery detection alarm system.

[0054] The photoelectric isolation module includes a photoelectric isolation chip U2 and a photoelectric isolation output circuit 2, and the photoelectric coupling chip U2 is connected to the photoelectric isolation output circuit 2. The photoelectric isolation output circuit 2 can perform photoelectric isolation on the working power after conversion by the power conversion circuit 1 and the communication signal from the control chip U3. By connecting the working power to the photoelectric isolation circuit output 2, the photoelectric isolation chip U2 isolates and converts the communication signal and the working power and transmits them to the communication circuit 14, providing the communication circuit 14 with the isolated converted working power, so that the communication signal received by the communication chip U4 is not affected by the working power.

[0055] The main control module includes a control chip U3 and a control circuit 3, and the control chip U3 is connected to the control circuit 3. The control chip U3 is used to analyze the self-test results of the entire system and detect and control various external input signals. The main control module is connected to other modules, and can receive detection signals from the detection module, and process the detection signals according to the currently set alarm value. When the detection value is higher than the alarm value, according to the currently set alarm mode, the corresponding alarm signal is output to the alarm module, and the alarm signal is output to the communication module at the same time.

[0056] The communication module includes a communication chip U4 and a communication circuit 14, and the communication chip U4 is connected to the communication circuit 14. When the communication chip U4 receives the alarm signal from the main control chip U3, the communication chip U4 outputs the alarm signal to the external device through the communication circuit 14, and cooperates with the original alarm module of the power battery detection alarm system to send an alarm to the user in a timely and multi-faceted manner, ensuring that the user can receive the alarm signal even when away from the lithium power battery.

[0057] As one implementation method, the alarm signal can be transmitted to the user's mobile phone.

[0058] The detection module includes a gas-sensitive detection circuit 12 and a temperature detection circuit 13, wherein the gas-sensitive detection circuit 12 is connected to the control chip U3, and the temperature detection circuit 13 is connected to the control chip U3. The gas-sensitive sensor in the gas-sensitive detection circuit 12 detects CO2, CO, H2, C2H4, CH4, C2H6 and C3H6 gases in the environment in real time, and outputs the detection result to the control chip U3 through the gas-sensitive detection circuit 12 in the form of voltage change; the temperature sensor in the temperature detection circuit 13 detects the ambient temperature in real time, and outputs the detection signal to the control chip U3 through the temperature detection circuit 13 in the form of voltage change. The control chip U3 combines the detection signal of the temperature detection circuit with the detection signal of the gas-sensitive detection circuit 12 to determine whether to alarm, so that the thermal runaway of the ternary lithium power battery can be discovered early and accurately.

[0059] The alarm module includes a buzzer alarm circuit 9, an indicator light alarm circuit 10 and a self-test signal output circuit 11, wherein the buzzer alarm circuit 9 is connected to the control chip U3, the indicator light alarm circuit 10 is connected to the control chip U3, and the self-test signal output circuit 11 is connected to the control chip U3. The buzzer alarm circuit 9 is connected to the control chip U3. When the buzzer alarm circuit 9 receives an acoustic alarm signal from the control chip U3, the alarm signal is connected to the transistor Q1 in the buzzer alarm circuit 9. The transistor Q1 amplifies the alarm signal and outputs it to the buzzer BUZI. The buzzer BUZI is powered on and works to emit an acoustic alarm. The indicator light alarm circuit 10 is connected to the control chip U3. When the control chip U3 outputs an optical alarm signal to the indicator light alarm circuit 10, the indicator light LED2 in the indicator light alarm circuit 10 is turned on and works, and the indicator light LED2 emits an optical alarm.

[0060] The alarm selection module is used to set the alarm mode and alarm value. The alarm selection module includes an operation panel, an alarm output mode selection circuit 8 connected to the operation panel, an alarm trigger concentration selection circuit 6 connected to the operation panel, an alarm trigger temperature selection circuit 7 connected to the operation panel, and an alarm detection time selection circuit 5 connected to the operation panel; the operation panel is used to set and display the alarm value, including a display, a plurality of buttons and a display / button circuit 4; the alarm output mode selection circuit 8 is connected to the control chip U3 and is used to select the alarm output mode; the alarm trigger concentration selection circuit 6 is connected to the control chip U3 and is used to set the alarm critical value of the gas concentration detection signal of the control chip U3. When the alarm value is higher than the alarm value, the control chip U3 will send an alarm signal; the alarm trigger temperature selection circuit 7 is connected to the control chip U3 and is used to set the alarm critical value of the temperature detection signal of the control chip U3. When the alarm value is higher than the alarm value, the control chip U3 will send an alarm signal; the alarm detection time selection circuit 5 is connected to the control chip U3 and is used to set the alarm delay value, that is, the time when the detection signal is continuously higher than the alarm value. If the instantaneous detection value is higher than the alarm value, it may be a detection error or a short-term environmental fluctuation. Setting the alarm delay can reduce the false alarm rate. Select the alarm value and alarm mode by pressing the buttons on the operation panel, and the current alarm value and alarm mode will be displayed on the display of the operation panel. Figure 5 As shown, the main control module is a single-chip microcomputer, and the control chip U3 is an atmega88pa chip; the control chip U3 includes pins 4, 6, 18 and 20, all of which are connected to the power conversion circuit 1; the control chip U3 includes pin 13 connected to the photoelectric isolation output circuit 2; the control chip U3 includes pin 14 connected to the buzzer alarm circuit 9; the control chip U3 includes pin 7 connected to the indicator alarm circuit 10; the control chip U3 includes pin 8 connected to the self-test signal output circuit 11; the control chip U3 includes pin 25 connected to the gas-sensitive detection circuit 12; the control chip U3 includes pin 24 connected to the temperature detection circuit 13; the control chip U3 includes pin 32 connected to the alarm output mode selection circuit 8; the control chip U3 includes pin 1 connected to the alarm trigger temperature selection circuit 7; the control chip U3 includes pin 9 connected to the alarm trigger concentration selection circuit 6; the control chip U3 includes pin 10 connected to the alarm detection duration selection circuit 5;

[0061] like Figure 3As shown, the power conversion circuit 1 includes polar capacitors C1 and C2, capacitors C3 and C4, indicator light LED1, pull-up resistor R1, diode D1, diode D2, diode D3, diode D4 and diode D5; pin 1 of the power conversion chip U1 is used to connect to the external input power supply, the positive electrode of the polar capacitor C2 is connected to pin 1 of the power conversion chip U1, and the negative electrode of the polar capacitor C2 is grounded; pin 4 of the power conversion chip U1 is connected to the control chip U3; one end of the inductor L1 is connected to the power conversion chip U 1, the other end of the inductor L1 is connected to the positive electrode of the polar capacitor C1, the negative electrode of the polar capacitor C1 is grounded, the negative electrode of the diode D3 is connected to the pin 2 of the power conversion chip U1, and the positive electrode of the diode D3 is grounded; the pin 3 of the power conversion chip U1 is grounded; the pin 5 of the power conversion chip U1 is grounded; the positive electrode of the indicator light LED1 is connected to the pin 4 of the power conversion chip U1 through the pull-up resistor R1, the negative electrode of the indicator light LED1 is grounded, one end of the capacitor C4 is connected to the indicator light LED1, and the other end of the capacitor C4 is connected to the resistor R1. Preferably, the power conversion chip U1 is a LM2596 chip.

[0062] The positive electrode of the indicator LED1 is connected to the pin 4 of the power conversion chip U1 through the pull-up resistor R1, and the pull-up resistor R1 makes the voltage of the indicator LED1 high, the negative electrode of the indicator LED1 is grounded, and the capacitor C4 is connected in parallel with the indicator LED1 and the resistor R1, and the capacitor C4 can protect the light-emitting diode indicator LED1 from being reversely broken down by the instantaneous high voltage. In this embodiment, the external input power supply is preferably a 24V DC voltage, which is converted into a 5V DC working power supply.

[0063] like Figure 4 As shown, the photoelectric isolation output circuit 2 includes a resistor R9, a capacitor C5, a composite diode D7 and a composite diode D8; pin 1 of the photoelectric coupling chip U2 is connected to the control chip U3 through the resistor R9; one end of the capacitor C5 is connected to pin 1 of the photoelectric coupling chip U2, and the other end of the capacitor C5 is connected to pin 2 of the photoelectric coupling chip U2; pin 2 of the photoelectric coupling chip U2 is grounded; one end of the composite diode D7 is connected to pin 3 of the photoelectric coupling chip U2, the other end of the composite diode D7 is connected to pin 4 of the photoelectric coupling chip U2, and the other end of the composite diode D7 is also connected to the composite diode D8; one end of the composite diode D8 is connected to pin 4 of the photoelectric coupling chip U2, the other end of the composite diode D8 is respectively connected to pin 3 of the photoelectric coupling chip U2, and the other end of the composite diode D8 is also connected to the composite diode D7.

[0064] Preferably, the photoelectric isolation chip U2 is a TLP521-1 chip.

[0065] like Figure 6 As shown, the buzzer alarm circuit 9 includes a buzzer BUZI, an NPN transistor Q1, a resistor R8, a resistor R7, a resistor R31 and a capacitor C13; one end of the resistor R31 is connected to pin 1 of the buzzer BUZI, and the other end of the resistor R31 is connected to pin 2 of the buzzer BUZI; pin 2 of the buzzer BUZI is connected to a power conversion module, pin 1 of the buzzer BUZI is connected to the collector of the NPN transistor Q1, and the base of the NPN transistor Q1 is connected to pin 14 of the control chip U3 through the resistor R7; one end of the resistor R8 is connected to the base of the NPN transistor Q1, and the other end of the resistor R8 is grounded; one end of the capacitor C13 is connected to the base of the NPN transistor Q1, the other end of the capacitor C13 is grounded, and the emitter of the NPN transistor Q1 is grounded.

[0066] The control chip U3 outputs an audible alarm signal through pin 14. The alarm signal is amplified and output at the collector. The alarm signal is amplified by the NPN transistor Q1, and the buzzer BUZI emits an audible alarm.

[0067] like Figure 7 As shown, the indicator light alarm circuit 10 includes an indicator light LED2 and a pull-up resistor R19; the positive electrode of the indicator light LED2 is connected to the power conversion module through the pull-up resistor R19, and the pull-up resistor R19 makes the indicator light LED2 at a normal voltage, and the negative electrode of the indicator light LED2 is connected to pin 7 of the control chip U3.

[0068] When the control chip U3 issues a light alarm command, pin 7 of the control chip U3 outputs a low level, and the indicator light LED2 issues a light alarm.

[0069] like Figure 8As shown, the self-test signal output circuit 11 includes a composite diode D6, a resistor R10, a resistor R20, a capacitor C6, a relay K1 and an NPN transistor Q2; the relay K1 includes a coil K1A, a switch K1B and a switch K1C; the positive electrode of the coil K1A is connected to an external input power supply, the negative electrode of the coil K1A is connected to the collector of the NPN transistor Q2, one end of the composite diode D6 is connected to the collector of Q2, the other end of the composite diode D6 is connected to the positive electrode of the coil K1A, and the base of the NPN transistor Q2 is connected to the control chip U3 through the resistor R10. Pin 8 of the control chip U3, the emitter of the NPN transistor Q2 is grounded; one end of the pull-down resistor R20 is connected to the base of the NPN transistor Q2, and the other end of the pull-down resistor R20 is grounded; one end of the capacitor C6 is connected to the base of the NPN transistor Q2, and the other end of the capacitor C6 is grounded; the control chip U3 sends pulse signals of different frequencies to the self-test signal output circuit 11 according to different situations, and the pulse signals generate square waves of different frequencies through the self-test signal output circuit 11, and the square waves are transmitted to external equipment, and the square waves are used to detect the current usage status of the ternary lithium battery detection alarm device.

[0070] As one of the implementation modes, when the power battery detection alarm system is in normal use, a square wave with a frequency below 1 Hz is output; when there is an alarm signal, a square wave with a frequency above 10 Hz is output; when the power battery detection alarm system fails, the relay K1 outputs a normally open or normally closed signal; the self-test result is output to an external device in real time through the optoelectronic isolation chip U2, and an external device other than the original sound and light alarm of the power battery detection alarm system is used for further alarm, thereby realizing remote alarm and improving the timeliness of handling accidents.

[0071] like Fig. 9 As shown, the gas-sensitive detection circuit 12 includes a gas sensor SE1, a resistor R4, a resistor R5 and a capacitor C15; Pin 2 of the gas sensor SE1 is connected to the power conversion module, Pin 5 of the gas sensor SE1 is grounded through a pull-down resistor R5, Pin 6 of the gas sensor SE1 is connected to Pin 4 of the gas sensor SE1, Pin 4 of the gas sensor SE1 is connected to Pin 25 of the control chip U3, and Pin 4 of the gas sensor SE1 is grounded through a pull-down resistor R4; One end of the capacitor C15 is connected to Pin 4, and the other end of the capacitor C15 is grounded; Pin 1 of the gas sensor SE1 is connected to Pin 3 of the gas sensor SE1, and Pin 3 of the gas sensor SE1 is connected to the power conversion module.

[0072] like Fig.10As shown, the temperature detection circuit 13 includes a temperature sensor RT1, a resistor R3, a resistor R6 and a capacitor C14; one end of the temperature sensor RT1 is connected to the power conversion module, the other end of the temperature sensor RT1 is connected to the pin 24 of the control chip U3, and the other end of the temperature sensor RT1 is grounded through the pull-down resistor R6; one end of the resistor R3 is connected to one end of the temperature sensor RT1, and the other end of the resistor R3 is connected to the other end of the temperature sensor RT1; one end of the capacitor C14 is connected to the temperature sensor RT1, and the other end of the capacitor C14 is grounded.

[0073] like Figure 5 As shown, the alarm selection module also includes a resistor R22, a resistor R23, a resistor R24 ​​and a resistor R25; the alarm output mode selection circuit 8 is connected to pin 32 of the control chip U3 through the resistor R22; the alarm trigger temperature selection circuit 7 is connected to pin 1 of the control chip U3 through the resistor R23; the alarm trigger concentration selection circuit 6 is connected to pin 9 of the control chip U3 through the resistor R24; the alarm detection duration selection circuit 5 is connected to pin 10 of the control chip U3 through the resistor R25.

[0074] As one embodiment, the display may be a digital tube display, which uses a preset code to represent the corresponding alarm mode and alarm value, and uses the code to display the currently selected alarm mode and alarm value. The button may be a dialer, which is connected to each alarm selection circuit through the display / button circuit 4 to control the current state of the alarm selection circuit, thereby selecting the alarm mode and alarm value.

[0075] As one implementation method, the alarm value and alarm mode can be set by using a dip switch, including:

[0076] Two alarm output modes, including light alarm mode and sound alarm mode;

[0077] Two alarm temperatures, alarm value is 60° or 80°;

[0078] Two alarm concentration levels, alarm value is 4000ppm or 8000ppm;

[0079] Two levels of alarm delay time, delay time is 1s or 3s.

[0080] As one implementation method, the communication chip U4 can use an RS485 chip.

[0081] The working principle of a power battery detection alarm system described in the present invention is:

[0082] The power battery detection alarm system described in the present invention is provided with an alarm selection module, which includes an alarm output mode selection circuit 8, an alarm trigger concentration selection circuit 6, an alarm trigger temperature selection circuit 7 and an alarm detection duration selection circuit 5. Each alarm value and alarm mode are selected by pressing buttons on the operation panel, and the code of the currently selected alarm mode and alarm value is displayed on the display on the operation panel.

[0083] The alarm value and alarm output mode, gas concentration alarm value, ambient temperature alarm value and alarm delay value can be flexibly set according to different environments. The flexible setting of different alarm values ​​and alarm modes can effectively eliminate and reduce external interference, reduce the false alarm and false trigger rate of the power battery detection alarm system, and make the power battery detection alarm system suitable for various environments.

[0084] The main control module of the power battery detection alarm system described in this embodiment has a self-checking function. The alarm module of the power battery detection alarm system includes a self-checking signal output circuit 11. The self-checking signal output circuit 11 receives the self-checking signal of the control chip U3 in real time. The self-checking signal is amplified and transmitted to the external device. The external device can receive the current self-checking result of the power battery detection alarm system in real time. When the power battery detection alarm system fails, the self-checking signal output circuit will generate a self-checking alarm, which will cause the alarm of the external device. The user can find it in time, which greatly reduces the risk caused by the failure of the power battery detection alarm system. For other structures of the power battery detection alarm system described in this embodiment, please refer to the prior art.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A power battery detection alarm system, characterized in that: include: A power conversion module, including a connected power conversion chip U1 and a power conversion circuit; The photoelectric isolation module includes a photoelectric isolation chip U2 and a photoelectric isolation output circuit connected to each other; The main control module includes a connected control chip U3 and a control circuit; A communication module, including a connected communication chip U4 and a communication circuit; The detection module includes a gas-sensitive detection circuit and a temperature detection circuit, wherein the gas-sensitive detection circuit is connected to the control chip U3, and the temperature detection circuit is connected to the control chip U3; The alarm module includes a buzzer alarm circuit, an indicator light alarm circuit and a self-test signal output circuit, wherein the buzzer alarm circuit is connected to the control chip U3, the indicator light alarm circuit is connected to the control chip U3, and the self-test signal output circuit is connected to the control chip U3; An alarm selection module, which is used to set an alarm mode and an alarm value, and the alarm selection module includes an operation panel, an alarm output mode selection circuit connected to the operation panel, an alarm trigger concentration selection circuit connected to the operation panel, an alarm trigger temperature selection circuit connected to the operation panel, and an alarm detection duration selection circuit connected to the operation panel; the operation panel, which is used to set and display the alarm value, includes a display, a plurality of buttons, and a display / button circuit; The main control module is a single-chip microcomputer, the control chip U3 is an atmega88pa chip, the control chip U3 performs self-test, the control chip U3 transmits the self-test signal to the self-test signal output circuit, and the self-test signal is transmitted to the external device through the self-test signal output circuit; The control chip U3 includes pins 4, 6, 18 and 20, all of which are connected to the power conversion circuit; The control chip U3 includes a pin 13 connected to a photoelectric isolation output circuit; The control chip U3 includes a pin 14 connected to a buzzer alarm circuit; The control chip U3 includes a pin 7 connected to the indicator light alarm circuit; The control chip U3 includes a pin 8 connected to the self-test signal output circuit; The control chip U3 includes a pin 25 connected to the gas-sensitive detection circuit; The control chip U3 includes a pin 24 connected to a temperature detection circuit; The control chip U3 includes a pin 32 connected to the alarm output mode selection circuit; The control chip U3 includes a pin 1 connected to the alarm trigger temperature selection circuit; The control chip U3 includes a pin 9 connected to the alarm trigger concentration selection circuit; The control chip U3 includes a pin 10 connected to the alarm detection duration selection circuit; The alarm output mode selection circuit is connected to the control chip U3 and is used to select the alarm output mode; The alarm trigger concentration selection circuit is connected to the control chip U3 and is used to set the alarm critical value of the gas concentration detection signal of the control chip U3. If the alarm value is higher than the alarm value, the control chip U3 will send out an alarm signal; The alarm trigger temperature selection circuit is connected to the control chip U3 and is used to set the alarm critical value of the temperature detection signal of the control chip U3. When the alarm value is higher than the alarm value, the control chip U3 will send out an alarm signal; The alarm detection time length selection circuit is connected to the control chip U3 and is used to set the alarm delay value, that is, the time during which the detection signal is continuously higher than the alarm value. If the instantaneous detection value is higher than the alarm value, it is considered to be a detection error or a short-term environmental fluctuation. The alarm delay is set to reduce the false alarm rate. Select the alarm value and alarm mode through the buttons on the operation panel, and the current alarm value and alarm mode are displayed on the display of the operation panel; Wherein, the power conversion module is used to convert the external input power into the working power of the power battery detection alarm system; The photoelectric isolation module is used to perform photoelectric isolation on the working power supply and communication signal of the communication module, the photoelectric isolation module is connected to the main control module, and the photoelectric isolation module is connected to the power conversion module; The main control module is used to control the operation and self-check of the power battery detection alarm system, and the main control module is connected to the power conversion module; The communication module is used to transmit the alarm signal to the external device, and the communication module is connected to the photoelectric isolation module; The detection module is used to detect the temperature value and the gas concentration values ​​of CO2, CO, H2, C2H4, CH4, C2H6 and C3H6. The detection module is connected to the main control module, and the detection module is connected to the power conversion module; The alarm module is used to convert the alarm signal received from the main control module into an audible and visual alarm and output a self-test signal. The alarm module is connected to the main control module and is connected to the power conversion module; The alarm selection module is used to set the alarm value and alarm mode of the power battery detection alarm system, and the alarm selection module is connected to the main control module; The self-test signal output circuit includes a composite diode D6, a resistor R10, a pull-down resistor R20, a capacitor C6, a relay K1 and an NPN transistor Q2; The relay K1 includes a coil K1A, a switch K1B and a switch K1C; The positive electrode of the coil K1A is connected to the external input power supply, the negative electrode of the coil K1A is connected to the collector of the NPN transistor Q2, one end of the composite diode D6 is connected to the collector of Q2, the other end of the composite diode D6 is connected to the positive electrode of the coil K1A, the base of the NPN transistor Q2 is connected to the pin 8 of the control chip U3 through the resistor R10, and the emitter of the NPN transistor Q2 is grounded; One end of the pull-down resistor R20 is connected to the base of the NPN transistor Q2, and the other end of the pull-down resistor R20 is grounded; One end of the capacitor C6 is connected to the base of the NPN transistor Q2, and the other end of the capacitor C6 is grounded; The power conversion chip U1 is a LM2596 chip; The power conversion circuit includes polar capacitor C1 and polar capacitor C2, capacitor C3 and capacitor C4, indicator light LED1, inductor L1, pull-up resistor R1, diode D1, diode D2, diode D3, diode D4 and diode D5; pin 1 of the power conversion chip U1 is used to connect to an external input power supply, the positive electrode of the polar capacitor C2 is connected to pin 1 of the power conversion chip U1, and the negative electrode of the polar capacitor C2 is grounded; Pin 4 of the power conversion chip U1 is connected to the control chip U3; One end of the inductor L1 is connected to pin 2 of the power conversion chip U1, the other end of the inductor L1 is connected to the positive electrode of the polarity capacitor C1, the negative electrode of the polarity capacitor C1 is grounded, the negative electrode of the diode D3 is connected to pin 2 of the power conversion chip U1, and the positive electrode of the diode D3 is grounded; Pin 3 of the power conversion chip U1 is grounded; Pin 5 of the power conversion chip U1 is grounded; The positive electrode of the indicator LED1 is connected to the No. 4 pin of the power conversion chip U1 through the pull-up resistor R1, the negative electrode of the indicator LED1 is grounded, one end of the capacitor C4 is connected to the indicator LED1, and the other end of the capacitor C4 is connected to the pull-up resistor R1; The photoelectric isolation chip U2 is a TLP521-1 chip; The photoelectric isolation output circuit includes a resistor R9, a capacitor C5, a composite diode D7 and a composite diode D8; Pin 1 of the photoelectric isolation chip U2 is connected to the control chip U3 via a resistor R9; One end of the capacitor C5 is connected to pin 1 of the photoelectric isolation chip U2, and the other end of the capacitor C5 is connected to pin 2 of the photoelectric isolation chip U2; Pin 2 of the photoelectric isolation chip U2 is grounded; One end of the composite diode D7 is connected to pin 3 of the photoelectric isolation chip U2, the other end of the composite diode D7 is connected to pin 4 of the photoelectric isolation chip U2, and the other end of the composite diode D7 is also connected to a composite diode D8; One end of the composite diode D8 is connected to pin 4 of the photoelectric isolation chip U2, and the other end of the composite diode D8 is connected to pin 3 of the photoelectric isolation chip U2. The other end of the composite diode D8 is also connected to the composite diode D7. The buzzer alarm circuit includes a buzzer BUZI, an NPN transistor Q1, a resistor R8, a resistor R7, a resistor R31 and a capacitor C13; One end of the resistor R31 is connected to pin 1 of the buzzer BUZI, and the other end of the resistor R31 is connected to pin 2 of the buzzer BUZI; Pin 2 of the buzzer BUZI is connected to the power conversion module, pin 1 of the buzzer BUZI is connected to the collector of the NPN transistor Q1, and the base of the NPN transistor Q1 is connected to pin 14 of the control chip U3 through a resistor R7; One end of the resistor R8 is connected to the base of the NPN transistor Q1, and the other end of the resistor R8 is grounded; One end of the capacitor C13 is connected to the base of the NPN transistor Q1, the other end of the capacitor C13 is grounded, and the emitter of the NPN transistor Q1 is grounded; The indicator light alarm circuit includes an indicator light LED2 and a pull-up resistor R19; The positive electrode of the indicator LED2 is connected to the power conversion module through the pull-up resistor R19. The pull-up resistor R19 makes the indicator LED2 at a normal voltage. The negative electrode of the indicator LED2 is connected to the pin 7 of the control chip U3. The gas sensing detection circuit includes a gas sensing sensor SE1, a resistor R4, a resistor R5 and a capacitor C15; Pin 2 of the gas sensor SE1 is connected to the power conversion module, pin 5 of the gas sensor SE1 is grounded through a pull-down resistor R5, pin 6 of the gas sensor SE1 is connected to pin 4 of the gas sensor SE1, pin 4 of the gas sensor SE1 is connected to pin 25 of the control chip U3, and pin 4 of the gas sensor SE1 is grounded through a pull-down resistor R4; The gas sensor SE1 of the gas detection circuit detects CO2, CO, H2, C2H4, CH4, C2H6 and C3H6 gases in the environment in real time, and outputs the detection results to the control chip U3 through the gas detection circuit in the form of voltage changes; One end of the capacitor C15 is connected to pin 4, and the other end of the capacitor C15 is grounded; Pin 1 of the gas sensor SE1 is connected to pin 3 of the gas sensor SE1, and pin 3 of the gas sensor SE1 is connected to the power conversion module; The temperature detection circuit includes a temperature sensor RT1, a resistor R3, a resistor R6 and a capacitor C14; One end of the temperature sensor RT1 is connected to the power conversion module, the other end of the temperature sensor RT1 is connected to the pin 24 of the control chip U3, and the other end of the temperature sensor RT1 is grounded through a pull-down resistor R6; One end of the resistor R3 is connected to one end of the temperature sensor RT1, and the other end of the resistor R3 is connected to the other end of the temperature sensor RT1; One end of the capacitor C14 is connected to the temperature sensor RT1, and the other end of the capacitor C14 is grounded; The temperature sensor RT1 in the temperature detection circuit detects the ambient temperature in real time, and outputs the detection signal in the form of voltage change through the temperature detection circuit to the control chip U3. The control chip U3 combines the detection signal of the temperature detection circuit with the detection signal of the gas-sensitive detection circuit to determine whether to alarm; The alarm selection module also includes a resistor R22, a resistor R23, a resistor R24 ​​and a resistor R25; The alarm output mode selection circuit is connected to pin 32 of the control chip U3 via resistor R22; The alarm trigger temperature selection circuit is connected to pin 1 of the control chip U3 via resistor R23; The alarm trigger concentration selection circuit is connected to pin 9 of the control chip U3 via resistor R24; The alarm detection duration selection circuit is connected to pin No. 10 of the control chip U3 via a resistor R25.

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