Storage battery operation parameter monitoring device and method

Abstract

The invention discloses a storage battery operation parameter monitoring device and method, and relates to the technical field of storage battery monitoring. The current acquisition module comprises a shunt and a current acquisition unit, and the shunt is connected in series to a current loop of the storage battery to be monitored; the current acquisition unit is used for acquiring voltage signals at two ends of the shunt and performing analog-to-digital conversion processing on the voltage signals to generate first digital signals; the data processing module is used for receiving the first digital signal output by the current acquisition module and carrying out calculation processing on the first digital signal based on a preset specification parameter of the shunt to obtain a second digital signal; the isolation communication module is used for receiving the second digital signal, performing signal conversion on the second digital signal, generating a target differential signal and sending the target differential signal to a preset monitor; and the power supply module is used for supplying power to the current acquisition module, the data processing module and the isolation communication module. The floating charge current of the storage battery can be accurately monitored, and the service life of the storage battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of battery monitoring, and in particular to a battery operating parameter monitoring device and method. Background Art

[0002] In the power industry, power plants, substations, and DC power supply systems used in many occasions such as steel, petrochemical, rail transit, and data centers need to collect battery and load currents. There are usually two solutions. One is to use Hall plus acquisition circuit. The advantage is that the Hall and the DC circuit are electrically isolated, and the accuracy is high when the current is close to the full scale. The disadvantage is that the zero drift is large under low current conditions, and the zero point usually needs to be adjusted through a potentiometer. The other is to use a shunt plus acquisition circuit, such as an ammeter; the shunt has a smaller zero drift than the Hall, but under low current conditions, due to the long sampling line, there is also a certain zero drift; therefore, many ammeters directly display the current as 0 under low current floating charge conditions, while the DC system battery is in floating charge state most of the time, and the current size under floating charge conditions can often reflect the health of the battery. Summary of the invention

[0003] In view of this, the present invention provides a battery operating parameter monitoring device and method, the main purpose of which is to solve the current problem of inaccurate current detection of the battery current loop when the battery is in a floating charge state.

[0004] In order to solve the above problems, the present application provides a battery operating parameter monitoring device, comprising:

[0005] A current acquisition module, comprising a shunt and a current acquisition unit, wherein the shunt is connected in series to the current loop of the battery to be monitored; the current acquisition unit is used to collect a voltage signal at both ends of the shunt, and perform analog-to-digital conversion on the voltage signal to generate a first digital signal;

[0006] a data processing module, the data processing module being electrically connected to the current acquisition module, and configured to receive the first digital signal output by the current acquisition module, and to calculate and process the first digital signal based on predetermined specification parameters of the shunt to obtain a second digital signal;

[0007] an isolation communication module, the isolation communication module being electrically connected to the data processing module, the isolation communication module being used to receive the second digital signal, perform signal conversion on the second digital signal, generate a target differential signal, and send the target differential signal to a preset monitor;

[0008] A power supply module is electrically connected to the current acquisition module, the data processing module and the isolated communication module, and is used to supply power to the current acquisition module, the data processing module and the isolated communication module.

[0009] Optionally, it is characterized in that the shunt is connected in series to the current loop of the battery to be monitored;

[0010] The current acquisition unit includes a filter circuit, a current sampling chip and a voltage stabilization circuit;

[0011] The input end of the filter circuit is electrically connected to the output end of the shunt;

[0012] The positive output terminal of the filter circuit is electrically connected to the positive input terminal of the current sampling chip; the negative output terminal of the filter circuit is electrically connected to the negative input terminal of the current sampling chip;

[0013] The output end of the current sampling chip is electrically connected to the first end of the voltage stabilizing circuit and the data processing module;

[0014] The second end of the voltage stabilizing circuit is electrically connected to the positive terminal of the first power supply of the battery operation parameter monitoring device.

[0015] Optionally, it is characterized in that the filtering circuit includes a first resistor, a second resistor, and a first capacitor;

[0016] The first end of the first resistor is electrically connected to the first output end of the shunt, the second end of the first resistor is electrically connected to the first end of the first capacitor and then electrically connected to the positive input end of the current sampling chip; the first end of the second resistor is electrically connected to the second output end of the shunt, the second end of the second resistor is electrically connected to the second end of the first capacitor and then electrically connected to the negative input end of the current sampling chip.

[0017] Optionally, the power supply voltage pin of the current sampling chip is electrically connected to the first power supply positive terminal and the first end of the second capacitor, and the second end of the second capacitor is electrically connected to the first ground terminal; the ground pin of the current sampling chip is electrically connected to the first ground terminal; the first address pin and the second address pin of the current sampling chip are electrically connected to the first ground terminal; the serial clock pin of the current sampling chip is electrically connected to the first pin of the IIC interface of the data processing module; the data signal line pin of the current sampling chip is electrically connected to the second pin of the IIC interface of the data processing module; and the programmable pin of the current sampling chip is electrically connected to the third pin of the IIC interface of the data processing module.

[0018] Optionally, the data processing module includes: a power supply unit, a power filter unit, a module reset unit, a data processing chip and a crystal oscillator unit;

[0019] The power supply unit includes a third capacitor, a fourth capacitor and a power supply chip; the first end of the third capacitor and the first end of the fourth capacitor are electrically connected to the positive terminal of the first power supply; the second end of the third capacitor and the second end of the fourth capacitor are electrically connected to the first ground terminal; each power supply pin of the power supply chip is electrically connected to the first ground terminal; each ground pin of the power supply chip is electrically connected to the first ground terminal;

[0020] The power supply filter unit includes a fifth capacitor, a sixth capacitor and a seventh capacitor; the fifth capacitor, the sixth capacitor and the seventh capacitor are connected in parallel between the positive terminal of the first power supply and the first ground terminal;

[0021] The module reset unit includes a third resistor and an eighth capacitor; the first end of the third resistor and the first end of the eighth capacitor are electrically connected to the reset pin of the data processing chip; the second end of the third resistor is electrically connected to the positive terminal of the first power supply; the second end of the eighth capacitor is electrically connected to the first ground terminal.

[0022] Optionally, the first communication output interface of the data processing chip is electrically connected to the request sending pin of the isolated communication module; the second communication output interface of the data processing chip is electrically connected to the data receiving pin of the isolated communication module; the third communication output interface of the data processing chip is electrically connected to the data sending pin of the isolated communication module; the first crystal oscillator pin and the second crystal oscillator pin of the data processing chip are respectively connected to the two ends of the crystal oscillator element in the crystal oscillator unit; the startup mode control pin of the data processing chip is electrically connected to the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected to the first ground terminal;

[0023] The crystal oscillator unit includes a crystal oscillator element, a ninth capacitor and a tenth capacitor; the first end of the crystal oscillator element is electrically connected to the first end of the ninth capacitor; the second end of the crystal oscillator element is electrically connected to the first end of the tenth capacitor; the second end of the ninth capacitor and the second end of the tenth capacitor are electrically connected to the first ground end.

[0024] Optionally, the isolation communication module includes a first isolation capacitor, a second isolation capacitor, an isolation chip and an EMC protection unit;

[0025] The first power pin of the isolation chip is electrically connected to the first end of the first isolation capacitor and the positive end of the first power supply; the second end of the first isolation capacitor is electrically connected to the first ground end; the first ground pin and the second ground pin of the isolation chip are electrically connected to the first ground end; the second power pin of the isolation chip is electrically connected to the positive end of the second power supply and the first end of the second isolation capacitor; the second end of the second isolation capacitor is electrically connected to the second ground end; the third ground pin and the fourth ground pin of the isolation chip are electrically connected to the second ground end; the first differential signal output end of the isolation chip is electrically connected to the first end of the first transient suppression diode of the EMC protection unit and the first end of the fifth resistor of the EMC protection unit; the second differential signal output end of the isolation chip is electrically connected to the second end of the first transient suppression diode of the EMC protection unit.

[0026] Optionally, the EMC protection unit includes the first transient suppression diode, the second transient suppression diode, the third transient suppression diode, the fifth resistor and the sixth resistor; the first end of the first transient suppression diode is electrically connected to the first end of the second transient suppression diode, the first end of the fifth resistor and the second differential signal output end of the isolation chip, and the second end of the first transient suppression diode is electrically connected to the first end of the third transient suppression diode, the first end of the sixth resistor and the first differential signal output end of the isolation chip; the second end of the second transient suppression diode and the second end of the third transient suppression diode are electrically connected to the second ground terminal; the second end of the fifth resistor is electrically connected to the second ground terminal; the second end of the sixth resistor is electrically connected to the second power supply positive terminal of the battery operation parameter monitoring device.

[0027] Optionally, the power supply module includes a diode, a first power supply capacitor, a second power supply capacitor, a third power supply capacitor, a fourth power supply capacitor, a fifth power supply capacitor, a sixth power supply capacitor, a first power conversion chip, a second power conversion chip and a third power conversion chip; the positive terminal of the diode is electrically connected to the target DC power input terminal; the negative terminal of the diode is electrically connected to the first end of the first power supply capacitor, the first end of the second power supply capacitor, the positive power input pin of the first power conversion chip and the positive power input pin of the second power conversion chip; the second end of the first power supply capacitor and the second end of the second power supply capacitor are electrically connected to the second ground terminal;

[0028] The first negative output terminal and the second negative output terminal of the first power conversion chip are electrically connected to the first end of the third power capacitor and the first ground terminal; the first positive output pin and the second positive output pin of the first power conversion chip are electrically connected to the second end of the third power capacitor, the input pin of the third power conversion chip and the first end of the fourth power capacitor; the first negative input pin of the first power conversion chip is electrically connected to the second ground terminal;

[0029] The output pin of the second power conversion chip is electrically connected to the positive terminal of the second power supply and the first terminal of the fifth power supply capacitor; the second terminal of the fifth power supply capacitor is electrically connected to the second ground terminal; the ground pin of the second power conversion chip is electrically connected to the second ground terminal;

[0030] The output pin of the third power conversion chip is electrically connected to the first power input terminal and the first end of the sixth capacitor; the ground pin of the third power conversion chip and the second end of the sixth capacitor are electrically connected to the first ground terminal.

[0031] In order to solve the above problems, this company provides a battery operating parameter monitoring method, including:

[0032] The current acquisition unit of the current acquisition module acquires a voltage signal at both ends of a shunt connected in series to the current loop of the battery to be monitored, and performs analog-to-digital conversion on the voltage signal to generate a first digital signal;

[0033] The data processing module receives the first digital signal output by the current acquisition module, and performs calculation and processing on the first digital signal based on the predetermined specification parameters of the shunt to obtain a second digital signal;

[0034] The isolated communication module receives the second digital signal, performs signal conversion on the second digital signal, generates a target differential signal, and sends the target differential signal to a preset monitor.

[0035] Beneficial effects of the present application: The battery operating parameter monitoring device of the present application can monitor the floating charge current of the battery, can accurately detect the magnitude of the current, and can effectively judge the health status of the battery based on the detected current value.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0038] Figure 1 A structural block diagram of a battery operating parameter monitoring device provided in an embodiment of the present application is shown;

[0039] Figure 2 The structure block diagram of the current acquisition module provided in the embodiment of the present application is shown;

[0040] Figure 3 The circuit structure diagram of the current acquisition module provided in the embodiment of the present application is shown;

[0041] Figure 4 The circuit structure diagram of the data processing module provided in the embodiment of the present application is shown;

[0042] Figure 5 A circuit structure diagram of an isolated communication module provided in an embodiment of the present application is shown;

[0043] Figure 6 The circuit structure diagram of the power module provided in the embodiment of the present application is shown;

[0044] Figure 7 A flow chart of a method for monitoring battery operating parameters provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0045] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0046] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0047] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0048] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0049] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0050] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0051] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0052] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0053] The present application embodiment provides a battery operating parameter monitoring device 10, which is installed in a battery charging and discharging circuit of a DC system of a substation, such as Figure 1 As shown, including:

[0054] The current acquisition module 20 includes a shunt 21 and a current acquisition unit 22, wherein the shunt 21 is connected in series to the current loop of the battery to be monitored; the current acquisition unit 22 is used to collect the voltage signal at both ends of the shunt 21, and perform analog-to-digital conversion on the voltage signal to generate a first digital signal;

[0055] A data processing module 30, the data processing module is electrically connected to the current acquisition module, and is used to receive the first digital signal output by the current acquisition module, and calculate and process the first digital signal based on predetermined specification parameters of the shunt to obtain a second digital signal;

[0056] An isolation communication module 40, the isolation communication module 40 is electrically connected to the data processing module 30, the isolation communication module is used to receive the second digital signal, perform signal conversion on the second digital signal, generate a target differential signal, and send the target differential signal to a preset monitor;

[0057] The power supply module 50 is electrically connected to the current acquisition module 20 , the data processing module 30 and the isolated communication module 40 , and is used to supply power to the current acquisition module, the data processing module and the isolated communication module.

[0058] The battery operating parameter monitoring device of the present application can monitor the battery float charge current. When the battery loop current is very small, the current size can be accurately detected when the battery current is in the range of [-100mA ~ 200mA]. The health status of the battery can be effectively judged based on the detected current value, thereby extending the battery life.

[0059] In the specific implementation process, Figure 2 As shown, the shunt 21 is connected in series to the current loop of the battery to be monitored. The current acquisition unit 22 includes a filter circuit 221, a current sampling chip 222 and a voltage stabilizing circuit 223; the input end of the filter circuit 221 is electrically connected to the output end of the shunt 21; the positive output end of the filter circuit 221 is electrically connected to the positive input end of the current sampling chip 222; the negative output end of the filter circuit 221 is electrically connected to the negative input end of the current sampling chip 222; the output end of the current sampling chip 222 is electrically connected to the first end of the voltage stabilizing circuit 223 and the data processing module 30; the second end of the voltage stabilizing circuit 223 is electrically connected to the positive terminal VDD3V3 of the first power supply. The present application adopts a shunt and a current sampling unit to ensure that a high sampling accuracy can be maintained even when the floating charge current is in the range of [-100mA to 200mA].

[0060] In the specific implementation process, Figure 3 As shown, the first end of the first resistor R1 is electrically connected to the first output end of the shunt 21, the second end of the first resistor R1 is electrically connected to the first end of the first capacitor C1 and then electrically connected to the positive input end of the current sampling chip 222; the first end of the second resistor is electrically connected to the second output end of the shunt, the second end of the second resistor R2 is electrically connected to the second end of the first capacitor C1 and then electrically connected to the negative input end of the current sampling chip 222. The voltage stabilizing circuit includes three resistors R9, R10, and R11 connected in parallel.

[0061] In the specific implementation process, the data processing module 30 includes: a power supply unit 310, a power filter unit 320, a module reset unit 330, a data processing chip 340 and a crystal oscillator unit 350; specifically, as Figure 4As shown, the power supply voltage pin VS of the current sampling chip 222 is electrically connected to the first power positive terminal VDD3V3 and the first end of the second capacitor C2, and the second end of the second capacitor C2 is electrically connected to the first ground terminal GND1; the model of the current sampling chip 222 can be INA228-VSSOP10, and the ground pin GND of the current sampling chip 222 is electrically connected to the first ground terminal GND1; the first address pin and the second address pin of the current sampling chip are electrically connected to the first ground terminal GND1; the serial clock pin SCL of the current sampling chip is electrically connected to the first pin PB6 of the IIC interface of the data processing module 30; the data signal line pin SDA of the current sampling chip is electrically connected to the second pin PB7 of the IIC interface of the data processing module 30; the programmable pin ALF of the current sampling chip is electrically connected to the third pin PB5 of the IIC interface of the data processing module 30. The data processing module is mainly used to dynamically record and store the sampled data collected by the data acquisition module. When an abnormality occurs, it can automatically record the sampled data values ​​before and after the fault, which is convenient for subsequent fault analysis and location. Finally, it can also upload the collected data to the upper preset monitor through the serial communication interface. It is also equipped with a USB communication interface to export the stored data. The data can be recorded and monitored in real time to provide a basis for subsequent maintenance.

[0062] In the specific implementation process, the power supply unit 310 includes a third capacitor C3, a fourth capacitor C4 and a power supply chip 311; the first end of the third capacitor C3 and the first end of the fourth capacitor C4 are electrically connected to the positive terminal VDD3V3 of the first power supply; the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are electrically connected to the first ground terminal VDD3V3; each power supply pin of the power supply chip 311 is electrically connected to the positive terminal of the first power supply respectively; the model of the power supply chip 311 can be STM32F103C8T6_B; each power supply pin of the power supply chip includes power supply pins such as VDD1, VDD2, VDD3, VDDA, VBAT, etc.; each ground pin of the power supply chip 311 is electrically connected to the first ground terminal respectively; each ground pin includes ground pins such as VSS1-2, VSS1-1, VSS3, VSSA, etc. The power filter unit includes a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor C7; the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are connected in parallel between the first power positive terminal VDD3V3 and the first ground terminal GND1.

[0063] The module reset unit 330 includes a third resistor R3 and an eighth capacitor C8; the first end of the third resistor R3 and the first end of the eighth capacitor C8 are connected to the reset pin of the data processing chip 340. The data processing chip 340 may be of the type STM32F103C8T6_A; the second end of the third resistor R3 is electrically connected to the first positive power supply terminal VDD3V3; the second end of the eighth capacitor C8 is electrically connected to the first ground terminal GND1.

[0064] In the specific implementation process, Figure 5 As shown, the first communication output interface PA11 of the data processing chip 340 is electrically connected to the request sending pin RTS of the isolated communication module; the second communication output interface PA10 of the data processing chip 340 is electrically connected to the data receiving pin RXD of the isolated communication module 40; the third communication output interface PA9 of the data processing chip is electrically connected to the data sending pin TXD of the isolated communication module 40; the first crystal oscillator pin and the second crystal oscillator pin of the data processing chip 340 are respectively connected to the two ends of the crystal oscillator element in the crystal oscillator unit; the startup mode control pin POOT0 of the data processing chip is electrically connected to the first end of the fourth resistor R4, and the second end of the fourth resistor is electrically connected to the first ground terminal GND1;

[0065] The crystal oscillator unit 350 includes a crystal oscillator element Y1, a ninth capacitor C9 and a tenth capacitor C10; the first end of the crystal oscillator element Y1 is electrically connected to the first end of the ninth capacitor C9; the second end of the crystal oscillator element Y1 is electrically connected to the first end GND1 of the tenth capacitor C10; the second end of the ninth capacitor C9 and the second end of the tenth capacitor C10 are electrically connected to the first ground GND1 end.

[0066] In the specific implementation process, Figure 5As shown, the isolation communication module 40 includes a first isolation capacitor C11, a second isolation capacitor C12, an isolation chip 401 and an EMC protection unit 402; the first power pin VDD1 of the isolation chip 401 is electrically connected to the first end of the first isolation capacitor C11 and the first power positive terminal VDD3V3; the second end of the first isolation capacitor C11 is electrically connected to the first ground terminal GND1; the first ground pin GND1 and the second ground pin GND2 of the isolation chip 401 are electrically connected to the first ground terminal GND1; the model of the data processing chip 340 can be ADM2483BRWZ-RS485; the second power pin VDD2 of the isolation chip 401 is electrically connected to The second power positive terminal VCCTX2 is electrically connected to the first end of the second isolation capacitor C12; the second end of the second isolation capacitor C12 is electrically connected to the second ground terminal GNDTX2; the third ground pin GND3 and the fourth ground pin GND4 of the isolation chip 401 are electrically connected to the second ground terminal GNDTX2; the first differential signal output terminal A of the isolation chip 401 is electrically connected to the first end of the first transient suppression diode D9 of the EMC protection unit 402 and the first end of the fifth resistor of the EMC protection unit 402; the second differential signal output terminal B of the isolation chip 401 is electrically connected to the second end of the first transient suppression diode D9 of the EMC protection unit 402. The user can obtain the target differential signal output by the first differential signal output terminal A and the second differential signal output terminal B to obtain the target current value of the current battery. To achieve monitoring of the battery loop current.

[0067] In a specific implementation process, the EMC protection unit 402 includes the first transient suppression diode D9, the second transient suppression diode D8, the third transient suppression diode D7, the fifth resistor R5 and the sixth resistor R6; the first end of the first transient suppression diode D9 is electrically connected to the first end of the second transient suppression diode D8, the first end of the fifth resistor R5 and the second differential signal output terminal B of the isolation chip 401, and the second end of the first transient suppression diode D9 is electrically connected to the first end of the third transient suppression diode D7, the first end of the sixth resistor R6 and the first differential signal output terminal A of the isolation chip 401; the second end of the second transient suppression diode D9 and the second end of the third transient suppression diode D7 are electrically connected to the second ground terminal GNDTX2; the second end of the fifth resistor R5 is electrically connected to the second ground terminal GNDTX2; the second end of the sixth resistor R6 is electrically connected to the second power supply positive terminal VCCTX2 of the battery operation parameter monitoring device.

[0068] In the specific implementation process, Figure 6As shown, the power module 50 includes a diode D1, a first power capacitor C13, a second power capacitor C14, a third power capacitor C15, a fourth power capacitor C16, a fifth power capacitor C17, a sixth power capacitor C18, a first power conversion chip 501, a second power conversion chip 502 and a third power conversion chip 503; the model of the first power conversion chip 501 can be F1205S_1WR2; the model of the second power conversion chip 502 can be LM1117-5V; the model of the third power conversion chip 503 can be The number can be LM1117-3.3V; the positive terminal of the diode D1 is electrically connected to the target DC power input terminal DC12V2; the negative terminal of the diode is electrically connected to the first end of the first power capacitor C13, the first end of the second power capacitor C14, the positive power input pin Vin+ of the first power conversion chip 501, and the positive power input pin IN of the second power conversion chip 502; the second end of the first power capacitor C13 and the second end of the second power capacitor C14 are electrically connected to the second ground terminal DC12V2;

[0069] The first negative output terminal Vout-1 and the second negative output terminal Vout-2 of the first power conversion chip 501 are electrically connected to the first end of the third power capacitor C15 and the first ground terminal GND1; the first positive output pin Vout+1 and the second positive output pin Vout+2 of the first power conversion chip 501 are electrically connected to the second end of the third power capacitor C15, the input pin of the third power conversion chip 503 and the first end of the fourth power capacitor C16; the first negative input pin Vin- of the first power conversion chip 501 is electrically connected to the second ground terminal GNDTX2;

[0070] The output pin OUT of the second power conversion chip 502 is electrically connected to the second power positive terminal VCCTX2 and the first end of the fifth power capacitor C17; the second end of the fifth power capacitor C17 is electrically connected to the second ground terminal GNDTX2; the ground pin OUT of the second power conversion chip 502 is electrically connected to the second ground terminal GNDTX2;

[0071] The output pin OUT of the third power conversion chip 503 is electrically connected to the first power input terminal VDD3V3 and the first end of the sixth capacitor C18; the ground pin GND of the third power conversion chip 503 and the second end of the sixth capacitor C18 are electrically connected to the first ground terminal GND1.

[0072] The present application collects the current signal of the current loop of the battery to be monitored through the shunt of the current acquisition module; receives the current signal through the current acquisition unit and performs analog-to-digital conversion processing on the current signal to generate a first digital signal; the data processing module receives the first digital signal output by the current acquisition module, and calculates and processes the first digital signal based on the predetermined specification parameters of the shunt to obtain a second digital signal; the isolation communication module receives the second digital signal, performs signal conversion on the second digital signal, generates a target differential signal, and sends the target differential signal to a preset monitor; the communication interface of the isolation communication module of the battery operation parameter monitoring device 10 is connected to the preset monitor, and the user can restore the floating current value of the battery to be monitored collected by the shunt by obtaining the target differential signal output by the first differential signal output terminal A and the second differential signal output terminal B. In this way, the floating current of the battery to be monitored can be monitored. The present application solves the problem that the current battery current cannot be accurately measured when it is very small (±100mA~200mA) and the measurement data cannot be saved under extreme conditions, increases the accuracy of battery maintenance, improves the service life of the battery pack, and also improves the convenience of locating problems after a fault.

[0073] Another embodiment of the present application provides a method for monitoring battery operating parameters, such as Figure 7 As shown, including:

[0074] Step S701: the current acquisition unit of the current acquisition module acquires a voltage signal at both ends of a shunt connected in series to the current loop of the battery to be monitored, and performs analog-to-digital conversion on the voltage signal to generate a first digital signal;

[0075] In the specific implementation process of this step, the shunt is connected in series in the current loop of the battery to be monitored. The battery current passes through the shunt and generates a maximum voltage signal of 75mV. The current acquisition unit uses the INA228 chip, which can accurately collect and measure sensing elements such as the shunt, and can measure a maximum voltage signal of ±163.84mV. The current acquisition unit converts the voltage signal data into a first digital signal and sends the first digital signal to the data processing module through the IIC interface.

[0076] Step S702: the data processing module receives the first digital signal output by the current acquisition module, and performs calculation processing on the first digital signal based on the predetermined specification parameters of the shunt to obtain a second digital signal;

[0077] In the specific implementation of this step, the predetermined specification of the shunt can be 50A / 75mV, 200A / 75mV, etc., and the second digital signal is obtained by performing calculation processing based on the first digital signal and the predetermined specification parameters. For example: the shunt specification is 100A / 75mV, assuming that the first digital signal measured at this time is 75mV, then the current second digital signal is calculated to be a current value of 100A.

[0078] Step S703: the isolation communication module receives the second digital signal, performs signal conversion on the second digital signal, generates a target differential signal, and sends the target differential signal to a preset monitor.

[0079] During the specific implementation of this step, the second digital signal processed by the data processing module is transmitted to the RS485 interface of the isolation communication module through the UART interface pin of the data processing chip. The user can read the real-time current value of the shunt through the target differential signal output by the first differential signal output terminal A and the second differential signal output terminal B of the isolation communication module. The use of the battery operating parameter monitoring device of the present application can save costs.

[0080] The present application collects the voltage signal at both ends of the shunt connected in series in the current loop of the battery to be monitored through the current acquisition unit of the current acquisition module, and performs analog-to-digital conversion processing on the voltage signal to generate a first digital signal; the data processing module receives the first digital signal output by the current acquisition module, and calculates and processes the first digital signal based on the predetermined specification parameters of the shunt to obtain a second digital signal; the isolation communication module receives the second digital signal, performs signal conversion on the second digital signal, generates a target differential signal, and sends the target differential signal to a preset monitor. The communication interface of the isolation communication module of the battery operation parameter monitoring device 10 is connected to the preset monitor, and the user can restore the floating current value of the battery to be monitored collected by the shunt by obtaining the target differential signal output by the first differential signal output terminal A and the second differential signal output terminal B. In this way, the floating current of the battery to be monitored can be monitored. The present application solves the problem that the current battery current cannot be accurately measured when it is very small (±100mA~200mA) and the measurement data cannot be saved under extreme conditions, increases the accuracy of battery maintenance, improves the service life of the battery pack, and also improves the convenience of locating problems after a fault.

[0081] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A battery operating parameter monitoring device, characterized in that: include: A current collection module, comprising a shunt and a current collection unit, wherein the shunt is connected in series to the current loop of the battery to be monitored; The current acquisition unit is used to acquire the voltage signal at both ends of the shunt, and perform analog-to-digital conversion on the voltage signal to generate a first digital signal; a data processing module, the data processing module being electrically connected to the current acquisition module, and configured to receive the first digital signal output by the current acquisition module, and to calculate and process the first digital signal based on predetermined specification parameters of the shunt to obtain a second digital signal; an isolation communication module, the isolation communication module being electrically connected to the data processing module, the isolation communication module being used to receive the second digital signal, perform signal conversion on the second digital signal, generate a target differential signal, and send the target differential signal to a preset monitor; A power supply module is electrically connected to the current acquisition module, the data processing module and the isolated communication module, and is used to supply power to the current acquisition module, the data processing module and the isolated communication module.

2. The battery operating parameter monitoring device according to claim 1, characterized in that: The shunt is connected in series to the current loop of the battery to be monitored; The current acquisition unit includes a filter circuit, a current sampling chip and a voltage stabilization circuit; The input end of the filter circuit is electrically connected to the output end of the shunt; The positive output terminal of the filter circuit is electrically connected to the positive input terminal of the current sampling chip; the negative output terminal of the filter circuit is electrically connected to the negative input terminal of the current sampling chip; The output end of the current sampling chip is electrically connected to the first end of the voltage stabilizing circuit and the data processing module; The second end of the voltage stabilizing circuit is electrically connected to the positive terminal of the first power supply of the battery operation parameter monitoring device.

3. The battery operating parameter monitoring device according to claim 2, characterized in that: The filter circuit includes a first resistor, a second resistor, and a first capacitor; The first end of the first resistor is electrically connected to the first output end of the shunt, the second end of the first resistor is electrically connected to the first end of the first capacitor and then electrically connected to the positive input end of the current sampling chip; the first end of the second resistor is electrically connected to the second output end of the shunt, the second end of the second resistor is electrically connected to the second end of the first capacitor and then electrically connected to the negative input end of the current sampling chip.

4. The battery operating parameter monitoring device according to claim 2, characterized in that: The power supply voltage pin of the current sampling chip is electrically connected to the first power positive terminal and the first end of the second capacitor, and the second end of the second capacitor is electrically connected to the first ground terminal; the ground pin of the current sampling chip is electrically connected to the first ground terminal; the first address pin and the second address pin of the current sampling chip are electrically connected to the first ground terminal; the serial clock pin of the current sampling chip is electrically connected to the first pin of the IIC interface of the data processing module; the data signal line pin of the current sampling chip is electrically connected to the second pin of the IIC interface of the data processing module; and the programmable pin of the current sampling chip is electrically connected to the third pin of the IIC interface of the data processing module.

5. The battery operating parameter monitoring device according to claim 1, characterized in that: The data processing module includes: a power supply unit, a power filter unit, a module reset unit, a data processing chip and a crystal oscillator unit; The power supply unit includes a third capacitor, a fourth capacitor and a power supply chip; the first end of the third capacitor and the first end of the fourth capacitor are electrically connected to the positive terminal of the first power supply; the second end of the third capacitor and the second end of the fourth capacitor are electrically connected to the first ground terminal; each power supply pin of the power supply chip is electrically connected to the first ground terminal; each ground pin of the power supply chip is electrically connected to the first ground terminal; The power supply filter unit includes a fifth capacitor, a sixth capacitor and a seventh capacitor; the fifth capacitor, the sixth capacitor and the seventh capacitor are connected in parallel between the positive terminal of the first power supply and the first ground terminal; The module reset unit includes a third resistor and an eighth capacitor; the first end of the third resistor and the first end of the eighth capacitor are electrically connected to the reset pin of the data processing chip; the second end of the third resistor is electrically connected to the positive terminal of the first power supply; the second end of the eighth capacitor is electrically connected to the first ground terminal.

6. The battery operating parameter monitoring device according to claim 5, characterized in that: The first communication output interface of the data processing chip is electrically connected to the request sending pin of the isolated communication module; the second communication output interface of the data processing chip is electrically connected to the data receiving pin of the isolated communication module; the third communication output interface of the data processing chip is electrically connected to the data sending pin of the isolated communication module; the first crystal oscillator pin and the second crystal oscillator pin of the data processing chip are respectively connected to the two ends of the crystal oscillator element in the crystal oscillator unit; the startup mode control pin of the data processing chip is electrically connected to the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected to the first ground terminal; The crystal oscillator unit includes a crystal oscillator element, a ninth capacitor and a tenth capacitor; the first end of the crystal oscillator element is electrically connected to the first end of the ninth capacitor; the second end of the crystal oscillator element is electrically connected to the first end of the tenth capacitor; the second end of the ninth capacitor and the second end of the tenth capacitor are electrically connected to the first ground end.

7. The battery operating parameter monitoring device according to claim 1, characterized in that: The isolated communication module includes a first isolation capacitor, a second isolation capacitor, an isolation chip and an EMC protection unit; The first power pin of the isolation chip is electrically connected to the first end of the first isolation capacitor and the positive end of the first power supply; the second end of the first isolation capacitor is electrically connected to the first ground end; the first ground pin and the second ground pin of the isolation chip are electrically connected to the first ground end; the second power pin of the isolation chip is electrically connected to the positive end of the second power supply and the first end of the second isolation capacitor; the second end of the second isolation capacitor is electrically connected to the second ground end; the third ground pin and the fourth ground pin of the isolation chip are electrically connected to the second ground end; the first differential signal output end of the isolation chip is electrically connected to the first end of the first transient suppression diode of the EMC protection unit and the first end of the fifth resistor of the EMC protection unit; the second differential signal output end of the isolation chip is electrically connected to the second end of the first transient suppression diode of the EMC protection unit.

8. The battery operating parameter monitoring device according to claim 7, characterized in that: The EMC protection unit includes the first transient suppression diode, the second transient suppression diode, the third transient suppression diode, the fifth resistor and the sixth resistor; the first end of the first transient suppression diode is electrically connected to the first end of the second transient suppression diode, the first end of the fifth resistor and the second differential signal output end of the isolation chip, the second end of the first transient suppression diode is electrically connected to the first end of the third transient suppression diode, the first end of the sixth resistor and the first differential signal output end of the isolation chip; the second end of the second transient suppression diode and the second end of the third transient suppression diode are electrically connected to the second ground terminal; the second end of the fifth resistor is electrically connected to the second ground terminal; the second end of the sixth resistor is electrically connected to the second power supply positive terminal of the battery operation parameter monitoring device.

9. The battery operating parameter monitoring device according to claim 1, characterized in that: The power module includes a diode, a first power capacitor, a second power capacitor, a third power capacitor, a fourth power capacitor, a fifth power capacitor, a sixth power capacitor, a first power conversion chip, a second power conversion chip and a third power conversion chip; the positive terminal of the diode is electrically connected to the target DC power input terminal; the negative terminal of the diode is electrically connected to the first end of the first power capacitor, the first end of the second power capacitor, the positive power input pin of the first power conversion chip and the positive power input pin of the second power conversion chip; the second end of the first power capacitor and the second end of the second power capacitor are electrically connected to the second ground terminal; The first negative output terminal and the second negative output terminal of the first power conversion chip are electrically connected to the first end of the third power capacitor and the first ground terminal; the first positive output pin and the second positive output pin of the first power conversion chip are electrically connected to the second end of the third power capacitor, the input pin of the third power conversion chip and the first end of the fourth power capacitor; the first negative input pin of the first power conversion chip is electrically connected to the second ground terminal; The output pin of the second power conversion chip is electrically connected to the positive terminal of the second power supply and the first terminal of the fifth power supply capacitor; the second terminal of the fifth power supply capacitor is electrically connected to the second ground terminal; the ground pin of the second power conversion chip is electrically connected to the second ground terminal; The output pin of the third power conversion chip is electrically connected to the first power input terminal and the first end of the sixth capacitor; the ground pin of the third power conversion chip and the second end of the sixth capacitor are electrically connected to the first ground terminal.

10. A method for monitoring battery operating parameters, characterized in that: include: The current acquisition unit of the current acquisition module acquires a voltage signal at both ends of a shunt connected in series to the current loop of the battery to be monitored, and performs analog-to-digital conversion on the voltage signal to generate a first digital signal; The data processing module receives the first digital signal output by the current acquisition module, and performs calculation and processing on the first digital signal based on the predetermined specification parameters of the shunt to obtain a second digital signal; The isolated communication module receives the second digital signal, performs signal conversion on the second digital signal, generates a target differential signal, and sends the target differential signal to a preset monitor.

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