WO2023185473A1

WO2023185473A1 - Battery detection apparatus and battery detection system

Info

Publication number: WO2023185473A1
Application number: PCT/CN2023/081585
Authority: WO
Inventors: 陈龙强
Original assignee: 深圳市道通科技股份有限公司
Priority date: 2022-04-02
Filing date: 2023-03-15
Publication date: 2023-10-05
Also published as: CN217467117U

Abstract

A battery detection apparatus (13) and a battery detection system (100). The battery detection apparatus (13) comprises a high-voltage harness plug (131) and a detection assembly (132); the high-voltage harness plug (131) is used for plugging in an output end of a power battery (200); the high-voltage harness plug (131) comprises a positive high-voltage line (1311) and a negative high-voltage line (1312); the detection assembly (132) comprises a housing (1321), a detection circuit (1322) mounted in the housing (1321), a wireless communication circuit (1323), and a control circuit (1324); the housing (1321) is detachably connected to the high-voltage harness plug (131); the detection circuit (1322) is separately electrically connected to the positive high-voltage line (1311) and the negative high-voltage line (1312), and is used for detecting working parameters of the power battery (200); the control circuit (1324) is separately electrically connected to the detection circuit (1322) and the wireless communication circuit (1323), and is used for controlling the wireless communication circuit (1323) to transmit the working parameters to an upper computer (12).

Description

A battery detection device and battery detection system

This application claims priority to the Chinese patent application filed with the China Patent Office on April 2, 2022, with application number 202220756024X and application title "A battery detection device and battery detection system", the entire content of which is incorporated herein by reference. Applying.

Technical field

This application relates to the field of new energy technology, and in particular to a battery detection device and a battery detection system.

Background technique

Power batteries are the main components of new energy vehicles, and the safety of power batteries is related to the driving safety of the vehicle. When a power battery fails, it needs to be repaired to determine the cause of the failure.

At present, when repairing power batteries, maintenance technicians generally use testing equipment such as multimeters to detect relevant parameters of the power battery, and determine the fault of the power battery based on the test results. However, the output voltage of the power battery is relatively high. When the maintenance technician directly uses a multimeter to detect the output voltage, the personal safety of the maintenance technician may be endangered due to improper operation or quality problems of the testing equipment.

Contents of the invention

Embodiments of the present application provide a battery detection device and a battery detection system, aiming to solve the technical problem of how to improve the safety and detection efficiency of power battery detection.

In order to solve the above technical problems, the embodiments of this application provide the following technical solutions:

In a first aspect, an embodiment of the present application provides a battery detection device, including:

A high-voltage wire harness plug is used for plugging into the output end of the power battery. The high-voltage wire harness plug includes a positive high-voltage wire and a negative high-voltage wire;

The detection component includes a casing and a detection circuit, a wireless communication circuit and a control circuit installed in the casing; the casing is detachably connected to the high-voltage harness plug; the detection circuit is connected to the positive high-voltage line and the The negative high-voltage line is electrically connected to detect the working parameters of the power battery; the control circuit is electrically connected to the detection circuit and the wireless communication circuit respectively, and is used to control the wireless communication circuit to transmit the working parameters to Host computer.

Optionally, the high-voltage wiring harness plug also includes a first plug connector and a second plug connector;

One end of the first plug connector is used to be plugged into the output end of the power battery, and the other end is detachably connected to one end of the positive high-voltage line and one end of the negative high-voltage line;

One end of the second plug connector is electrically connected to the other end of the positive high-voltage line and the other end of the negative high-voltage line respectively, and the other end is detachably connected to the housing.

Optionally, the detection circuit includes:

A first voltage sampling circuit, electrically connected between the positive high-voltage line and ground, for sampling the first voltage value between the positive electrode of the power battery and ground;

The second voltage sampling circuit is electrically connected between the negative high-voltage line and the ground, and is used to sample the negative electrode and the ground of the power battery. The second voltage value between ground;

A switching circuit includes a first end, a second end and a control end. The first end of the switching circuit is electrically connected to the positive high-voltage line, and the control end of the switching circuit is electrically connected to the control circuit;

A resistor, one end of which is electrically connected to the second end of the switch circuit, and the other end of which is grounded.

Optionally, the first voltage sampling circuit includes:

A first voltage dividing circuit, electrically connected between the positive high-voltage line and the ground, for dividing the voltage between the positive electrode of the power battery and the ground;

A first operational amplifier, the first input terminal of the first operational amplifier is electrically connected to the first voltage dividing circuit, the second input terminal of the first operational amplifier is used to input the first reference voltage, the first The output terminal of the operational amplifier is electrically connected to the control circuit.

Optionally, the first voltage sampling circuit includes:

a second voltage dividing circuit, electrically connected between the negative electrode high-voltage line and the ground, for dividing the voltage between the negative electrode of the power battery and the ground;

A second operational amplifier, the first input terminal of the second operational amplifier is electrically connected to the second voltage dividing circuit, the second input terminal of the second operational amplifier is used to input a second reference voltage, the second The output terminal of the operational amplifier is electrically connected to the control circuit.

Optionally, the control circuit includes:

A controller, electrically connected to the detection circuit and the wireless communication circuit respectively;

A power supply circuit is electrically connected to the controller and the wireless communication circuit respectively.

Optionally, the wireless communication circuit is a Bluetooth communication circuit.

In a second aspect, embodiments of the present application provide a battery detection system, including:

Communication connection device, used for communication connection with the power battery;

A host computer is communicatively connected to the communication connection device, and is used to communicate with the power battery through the communication connection device; and

In the battery detection device as described above, the control circuit of the battery detection device is communicatively connected with the host computer.

Optionally, the communication connection device is a diagnostic connection box.

Optionally, the host computer is a diagnostic instrument.

Through the above technical solution, the battery detection device and battery detection system of the present application have the following beneficial effects: when testing the power battery, there is no need for manual direct charging operation, which can ensure personal safety, and there is no need to manually judge whether the power battery is faulty. Improve detection efficiency.

Description of drawings

One or more embodiments are only illustratively illustrated through the corresponding pictures in the drawings. These illustrative illustrations do not constitute limitations to the embodiments. Elements with the same reference numerals in the accompanying drawings are represented as similar elements. , unless otherwise specified It is understood that the figures in the accompanying drawings do not constitute limitations on scale.

Figure 1 is a schematic structural diagram of an application environment provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of the battery detection system and power battery shown in Figure 1;

Figure 3 is a schematic structural diagram of the battery detection device shown in Figure 2;

Figure 4 is a schematic circuit structure diagram of the battery detection device shown in Figure 2;

Figure 5 is a schematic circuit structure diagram of the detection circuit shown in Figure 4;

FIG. 6 is a schematic circuit structure diagram of the first voltage sampling circuit and the second voltage sampling circuit shown in FIG. 5 .

Detailed ways

In order to facilitate understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween. Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the technical field belonging to this application. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not used to limit this application. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this application, "communication connection" includes wired communication connections or wireless communication connections, where wired communication connections include various types of communication connections that use tangible media such as metal wires and optical fibers to transmit information. Wireless communication connections include 5G communication, 4G communication, 3G communication, 2G communication, CDMA, Zig-Bee, Bluetooth, wireless broadband (Wi-Fi), ultra-wideband (UWB) and near field communication (NFC), CDMA2000, GSM, Infrared(IR), ISM, RFID, UMTS/3GPPw/HSDPA, WiMAXWi-Fi or ZigBee, etc.

In this application, "detachable connection" includes any detachable connection method, such as snap connection, key connection, pin connection, threaded connection, etc.

The embodiment of the present application provides an application environment. Referring to Figure 1, the application environment includes a battery detection system 100 and a power battery 200.

The battery detection system 100 is communicatively connected with the power battery 200. The battery detection system 100 can detect the working parameters of the power battery 200, and detect the power battery 200 according to the working parameters.

In some embodiments, please refer to FIG. 2 , the power battery 200 includes a battery pack 21 , a battery management system 22 and a switch 23 .

The battery pack 21 is a unit configured to store electric power, and may include at least one battery cell (not shown). The battery pack 21 may include one battery cell or multiple battery cells. When the battery pack 21 includes multiple battery cells, the battery cells may be connected in series, in parallel, or both in series and in parallel. The number of battery cells in the battery pack 21 or the connection method of the battery cells may be determined based on the required output voltage and power storage capacity.

The battery unit may include a rechargeable secondary battery (except when the secondary battery is a primary battery such as a lead acid battery). For example, battery cells may include nickel-cadmium batteries, nickel metal hydride (NiMH) batteries, lithium-ion batteries, lithium polymer batteries, and the like.

The battery management system 22 can monitor and obtain various information about the battery pack 21, such as the current, voltage, temperature, etc. of the battery 21. Based on the obtained information, the battery management system 22 can evaluate the specific status of the battery pack 21 , such as the voltage of the battery pack 21 , the current of the battery pack 21 , the charging capacity of the battery pack 21 , whether the battery pack 21 is fully charged, whether the battery pack 21 Whether overcharging, overcurrent occurs, overvoltage occurs, the degree of deterioration of the battery pack 21, etc. Battery management system 22 may include all types of devices configured to process data, such as a processor that may analyze the status of battery pack 21 and determine whether it is necessary to protect battery pack 21 .

The switch 23 is disposed on the voltage output path of the battery pack 21 . The switch 23 can be controlled by the battery management system 22 to turn on or off the voltage output path of the battery pack 21 . The switch 23 may include any electronic switching tube or switching device, such as a field effect transistor, a contactor, a relay, etc.

In some embodiments, as shown in FIG. 2 , the battery detection system 100 includes a communication connection device 11 , a host computer 12 and a battery detection device 13 .

The communication connection device 11 can be connected in communication with the power battery 200 . The communication connection device 11 can be used as a communication connection medium and has a protocol conversion function.

The host computer 12 is communicatively connected to the communication connection device 11. The host computer 12 can communicate with the power battery 200 through the communication connection device 11. For example, the host computer 12 transmits data of a specific transmission protocol to the communication connection device 11, and the communication connection device 11 transmits the data. The data of the specific transmission protocol is converted into a protocol, and then the data conforming to the transmission protocol of the power battery 200 is transmitted to the power battery 200 to realize communication between the host computer 12 and the power battery 200 .

When the host computer 12 communicates with the power battery 200, the host computer 12 can transmit control instructions to the power battery 200 through the communication connection device 11, so that the power battery 200 performs corresponding operations according to the control instructions.

For example, the host computer 12 is communicatively connected to the battery management system 22 of the power battery 200 through the communication connection device 11. When detecting the power battery 200, the host computer 12 transmits switch control instructions to the battery management system 22 through the communication connection device 11. The battery management The system 22 controls the switch 23 to turn on according to the switch control instruction to turn on the voltage output path of the battery pack 21 .

The battery detection device 13 is communicatively connected with the host computer 12 . The battery detection device 13 can detect the working parameters of the power battery 200 and transmit the working parameters to the host computer 12. The host computer 12 can determine whether a corresponding fault occurs in the power battery 200 based on the working parameters.

As mentioned above, when the voltage output path of the battery pack 21 is turned on, the battery pack 21 can output voltage, and the battery detection device 13 can detect the output voltage, obtain the output voltage and transmit it to the host computer 12, and the host computer 12 passes the judgment Whether the output voltage is within the normal voltage range is used to detect whether the power battery 200 has an abnormal output voltage fault.

Therefore, the test results of the power battery 200 can be directly given by the host computer 12 , eliminating the need to manually determine whether the power battery 200 is faulty, which can lower the maintenance threshold for maintenance technicians and improve maintenance efficiency.

In some embodiments, communication connection device 11 is a diagnostic connection box. The diagnostic connection box can establish a communication connection between the device to be diagnosed and the diagnostic host, such as the communication connection between the power battery 200 and the host computer 12, to realize the diagnostic function of the diagnostic host for the device to be diagnosed.

In some embodiments, the host computer 12 is a diagnostic instrument.

The diagnostic instrument is a vehicle fault self-diagnosis terminal. Users can use the diagnostic instrument to quickly read faults in the car's electronic control system, and display the fault information on the display screen to quickly identify the location and cause of the fault. In this embodiment, the diagnostic instrument can establish a communication connection with the power battery of the vehicle through the communication connection box. When the diagnostic instrument establishes a communication connection with the power battery, the user can operate the diagnostic instrument and input the vehicle VIN (Vehicle Identification Number, vehicle identification number) code or select the unique identification of the power battery provided on the diagnostic tool to determine the power battery that needs to be connected to achieve communication with the power battery. The diagnostic instrument can also process the working parameters sent by the battery detection device 13, and determine whether a fault occurs based on the working parameters.

In some embodiments, please refer to FIGS. 3 and 4 together, the battery detection device 13 includes a high-voltage harness plug 131 and a detection component 132 .

The high-voltage harness plug 131 can be plugged into the output end of the power battery 200. The high-voltage harness plug 131 includes a positive high-voltage line 1311 and a negative high-voltage line 1312. When the high-voltage harness plug 131 is plugged into the output end of the power battery 200, the positive high-voltage line 1311 can be connected to the power battery. The positive electrode of the power battery 200 is electrically connected, and the negative electrode high-voltage line 1312 can be electrically connected to the negative electrode of the power battery 200 .

The detection component 132 includes a housing 1321, a detection circuit 1322, a wireless communication circuit 1323 and a control circuit 1324. The detection circuit 1322, the wireless communication circuit 1323 and the control circuit 1324 are all installed in the housing 1321.

The housing 1321 is detachably connected to the high-voltage harness plug 131 .

When the housing 1321 is connected to the high-voltage harness plug 131, the detection circuit 1322 can be electrically connected to the positive high-voltage line 1311 and the negative high-voltage line 1312 respectively. The detection circuit 1322 can detect the operating parameters of the power battery 200, such as insulation resistance value, output voltage, etc.

The control circuit 1324 is electrically connected to the detection circuit 1322 and the wireless communication circuit 1323 respectively. The control circuit 1324 can control the wireless communication circuit 1323 to transmit the operating parameters to the host computer 12 .

In some embodiments, referring to Figure 5, the control circuit 1324 includes a controller 13241 and a power supply circuit 13242.

The controller 13241 is electrically connected to the detection circuit 1322 and the wireless communication circuit 1323 respectively. The controller 13241 can receive the working parameters of the power battery 200 detected by the detection circuit 1322 and control the wireless communication circuit 1323 to transmit the working parameters to the host computer 12 .

When detecting the power battery 200 in this embodiment, the high-voltage harness plug 131 is plugged into the output end of the power battery 200. The high-voltage harness plug 131 is then electrically connected to the detection circuit 1322. The control circuit 1324 transmits the working parameters detected by the detection circuit 1322 through wireless communication. The communication circuit 1323 transmits it to the host computer 12 for processing and analysis, without manual direct power-on operation, which can ensure personal safety.

In some embodiments, the controller 13241 can be any general-purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), microcontroller, ARM (Acorn RISC Machine) or other Programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the controller 13241 can be any conventional processor, controller, microcontroller or state machine. Controller 13241 may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP, and/or any other such configuration.

The power supply circuit 13242 is electrically connected to the controller 13241 and the wireless communication circuit 1323 respectively, and is used to provide power to the controller 13241 and the wireless communication circuit 1323. Wireless communication circuit 1323 supplies power.

In some embodiments, the power supply circuit 13242 includes a power chip, and the power chip can convert the input voltage into a voltage suitable for the operation of the controller 13241 or the wireless communication circuit 1323, such as a DC voltage of 5V or a DC voltage of 3.3V. Among them, the power chip can be a commonly used conversion chip on the market, for example, the conversion chip is the LM1117 chip.

The wireless communication circuit 1323 is any circuit that can implement wireless communication functions, such as a Bluetooth circuit, a wireless broadband (Wi-Fi) circuit, an ultra-wideband (UWB) circuit, a near field communication (NFC) circuit, a ZigBee circuit, etc. , in some embodiments, the wireless communication circuit 1323 is a Bluetooth communication circuit.

In some embodiments, please continue to refer to FIG. 3 . The high-voltage harness plug 131 further includes a first plug connector 1313 and a second plug connector 1314 .

One end of the first connector 1313 can be plugged into the output end of the power battery 200 , and the other end is detachably connected to one end of the positive high-voltage line 1311 and one end of the negative high-voltage line 1312 respectively.

One end of the second connector 1314 is electrically connected to the other end of the positive high-voltage line 1311 and the other end of the negative high-voltage line 1312 respectively, and the other end is detachably connected to the housing 1321 .

In some embodiments, detection circuit 1322 is an insulation detection circuit. The detection circuit 1322 is electrically connected to the positive high-voltage line 1311, the negative high-voltage line 1312 and the controller 13241 respectively. The detection circuit 1322 can obtain the insulation detection parameters of the power battery 200 and output them to the controller 13241. The controller 13241 obtains the insulation resistance by processing the insulation detection parameters. value, the controller 13241 can control the wireless communication circuit 1323 to transmit the insulation resistance value to the host computer 12. The host computer 12 can determine whether the insulation resistance value is within the normal resistance range to detect whether there is a leakage fault in the power battery 200.

In some embodiments, please refer to FIG. 5 , the detection circuit 1322 includes a first voltage sampling circuit 13221, a second voltage sampling circuit 13222, a switch circuit 13223 and a resistor R1.

The first voltage sampling circuit 13221 is electrically connected between the positive high-voltage line 1311 and the ground, and can sample the first voltage value between the positive electrode of the power battery 200 and the ground.

The second voltage sampling circuit 13222 is electrically connected between the negative high-voltage line 1312 and the ground, and can sample the second voltage value between the negative electrode of the power battery 200 and the ground.

In some embodiments, the controller 13241 can perform a difference processing between the first voltage value and the second voltage value to obtain the output voltage of the power battery 200, and then transmit the output voltage to the host computer 12 by controlling the wireless communication circuit 1323. 12 can determine whether the output voltage is within the normal voltage range to detect whether the power battery 200 has an abnormal output voltage fault.

The switch circuit 13223 includes a first terminal 5a, a second terminal 5b and a control terminal 5c. The first terminal 5a of the switch circuit 13223 is electrically connected to the positive high-voltage line 1311, and the control terminal 5c of the switch circuit 13223 is electrically connected to the controller 13241.

One end of the resistor R1 is electrically connected to the second end 5b of the switching circuit 13223, and the other end of the resistor R1 is grounded.

The switch circuit 13223 can be turned on or off under the controller 13241. When the switch circuit 13223 is turned on, the positive electrode of the power battery 200 is grounded through the resistor R1. When the switch circuit 13223 is turned off, the positive electrode of the power battery 200 is not connected through the resistor R1. Ground.

The first voltage sampling circuit 13221 can respectively sample the first voltage value corresponding to the switch circuit 13223 in the on and off states, and the second voltage sampling circuit 13222 can respectively sample the corresponding first voltage value of the switch circuit 13223 in the on and off states. Two voltage values, The controller 13241 can calculate the insulation resistance value through the corresponding first voltage value, the second voltage value, the resistance of the resistor R1 and the internal resistance of the first voltage sampling circuit 13221 or the second voltage sampling circuit 13222.

In some embodiments, the controller 13241 calculates the insulation resistance value according to the following Equation 1 and Equation 2:

Wherein, _Ri is the insulation resistance value, r is the internal resistance of the first voltage sampling circuit 13221 or the second voltage sampling circuit 13222 (assuming that the internal resistance of the first voltage sampling circuit 13221 is equal to the internal resistance of the second voltage sampling circuit 13222) , R ₁ is the resistance value of resistor R1, U ₁ is the first voltage value between the positive electrode of the power battery 200 and the ground when the switch circuit 13223 is turned off, U ₂ is the negative electrode of the power battery 200 and the ground when the switch circuit 13223 is turned off. The second voltage value between, U ₁ ' is the first voltage value between the positive electrode of the power battery 200 and the ground when the switch circuit 13223 is turned on, and U ₂ ' is the negative electrode of the power battery 200 and the ground when the switch circuit 13223 is turned on. the second voltage value between.

In some embodiments, the switching circuit 13223 may include any electronic switching tube or switching device, such as a triode, a field effect transistor, etc.

In some embodiments, please refer to FIG. 6 , the first voltage sampling circuit 13221 includes a first voltage dividing circuit 61 and a first operational amplifier 62 .

The first voltage dividing circuit 61 is electrically connected between the positive high-voltage line 1311 and the ground. The first voltage dividing circuit 61 can divide the voltage between the positive electrode of the power battery 200 and the ground.

The first input terminal of the first operational amplifier 62 is electrically connected to the first voltage dividing circuit 61 , the second input terminal of the first operational amplifier 62 can input the first reference voltage VR1 , and the output terminal of the first operational amplifier 62 is connected to the controller 13241 Electrical connection.

Specifically, the first voltage dividing circuit 61 includes a resistor R2 and a resistor R3. One end of the resistor R2 is electrically connected to the positive high-voltage line 1311. The other end of the resistor R2 is electrically connected to the first input end of the first operational amplifier 62 and one end of the resistor R3 respectively. connection, the other end of resistor R3 is connected to ground.

It can be understood that the first input terminal of the second operational amplifier 62 can be a non-inverting input terminal or an inverting input terminal. The first input terminal of the second operational amplifier 62 can be a non-inverting input terminal. Correspondingly, the second operational amplifier 62 can be a non-inverting input terminal. The second input terminal of the amplifier 62 is an inverting input terminal, and the first input terminal of the second operational amplifier 62 is an inverting input terminal. Correspondingly, the second input terminal of the second operational amplifier 62 is a non-inverting input terminal.

As shown in FIG. 6 , the second voltage sampling circuit 13222 includes a second voltage dividing circuit 63 and a second operational amplifier 64 .

The second voltage dividing circuit 63 is electrically connected between the negative electrode high voltage line 1312 and the ground. The second voltage dividing circuit 63 can divide the voltage between the negative electrode of the power battery 200 and the ground.

The first input terminal of the second operational amplifier 64 is electrically connected to the second voltage dividing circuit 63, and the second input terminal of the second operational amplifier 64 The input terminal can input the second reference voltage VR2, and the output terminal of the second operational amplifier 64 is electrically connected to the controller 13241.

Specifically, the second voltage dividing circuit 63 includes a resistor R4 and a resistor R5. One end of the resistor R4 is electrically connected to the negative high-voltage line 1312, and the other end of the resistor R4 is electrically connected to the first input end of the second operational amplifier 64 and one end of the resistor R5 respectively. connection, the other end of resistor R5 is connected to ground.

It can be understood that the first input terminal of the second operational amplifier 64 can be a non-inverting input terminal or an inverting input terminal. The first input terminal of the second operational amplifier 64 can be a non-inverting input terminal. Correspondingly, the second operational amplifier 64 can be a non-inverting input terminal. The second input terminal of the amplifier 64 is an inverting input terminal, and the first input terminal of the second operational amplifier 64 is an inverting input terminal. Correspondingly, the second input terminal of the second operational amplifier 64 is a non-inverting input terminal.

Finally, it should be noted that this application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not used as additional restrictions on the content of this application. The purpose of providing these embodiments is to make the application A more thorough and comprehensive understanding of the disclosed content. And under the idea of this application, the above-mentioned technical features continue to be combined with each other, and there are many other changes in different aspects of the application as mentioned above, which are all deemed to be within the scope of the description of this application; further, for those of ordinary skill in the art, It can be said that improvements or changes can be made based on the above description, and all these improvements and changes should fall within the protection scope of the appended claims of this application.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A battery testing device including:

A high-voltage wire harness plug is used for plugging into the output end of the power battery. The high-voltage wire harness plug includes a positive high-voltage wire and a negative high-voltage wire;

The detection component includes a casing and a detection circuit, a wireless communication circuit and a control circuit installed in the casing; the casing is detachably connected to the high-voltage harness plug; the detection circuit is connected to the positive high-voltage line and the The negative high-voltage line is electrically connected to detect the working parameters of the power battery; the control circuit is electrically connected to the detection circuit and the wireless communication circuit respectively, and is used to control the wireless communication circuit to transmit the working parameters to Host computer.
The battery testing device according to claim 1,

The high-voltage wiring harness plug also includes a first plug connector and a second plug connector;

One end of the first plug connector is used to be plugged into the output end of the power battery, and the other end is detachably connected to one end of the positive high-voltage line and one end of the negative high-voltage line;

One end of the second plug connector is electrically connected to the other end of the positive high-voltage line and the other end of the negative high-voltage line respectively, and the other end is detachably connected to the housing.
The battery detection device according to claim 1, the detection circuit includes:

A first voltage sampling circuit, electrically connected between the positive high-voltage line and ground, for sampling the first voltage value between the positive electrode of the power battery and ground;

A second voltage sampling circuit, electrically connected between the negative high-voltage line and ground, for sampling the second voltage value between the negative electrode of the power battery and ground;

A switching circuit includes a first end, a second end and a control end. The first end of the switching circuit is electrically connected to the positive high-voltage line, and the control end of the switching circuit is electrically connected to the control circuit;

A resistor, one end of which is electrically connected to the second end of the switch circuit, and the other end of which is grounded.
The battery detection device according to claim 3, the first voltage sampling circuit includes:

A first voltage dividing circuit, electrically connected between the positive high-voltage line and the ground, for dividing the voltage between the positive electrode of the power battery and the ground;

A first operational amplifier, the first input terminal of the first operational amplifier is electrically connected to the first voltage dividing circuit, the second input terminal of the first operational amplifier is used to input the first reference voltage, the first The output terminal of the operational amplifier is electrically connected to the control circuit.
The battery detection device according to claim 3, the first voltage sampling circuit includes:

a second voltage dividing circuit, electrically connected between the negative electrode high-voltage line and the ground, for dividing the voltage between the negative electrode of the power battery and the ground;

A second operational amplifier, the first input terminal of the second operational amplifier is electrically connected to the second voltage dividing circuit, the second input terminal of the second operational amplifier is used to input a second reference voltage, the second The output of the op amp is connected to the control Circuit electrical connection.
The battery detection device according to claim 1, the control circuit includes:

A controller, electrically connected to the detection circuit and the wireless communication circuit respectively;

A power supply circuit is electrically connected to the controller and the wireless communication circuit respectively.
The battery detection device according to any one of claims 1 to 6, wherein the wireless communication circuit is a Bluetooth communication circuit.
A battery detection system including:

Communication connection device, used for communication connection with the power battery;

A host computer is communicatively connected to the communication connection device, and is used to communicate with the power battery through the communication connection device; and

The battery detection device according to any one of claims 1 to 7, wherein the control circuit of the battery detection device is communicatively connected with the host computer.
The battery testing system according to claim 8, wherein the communication connection device is a diagnostic connection box.
The battery detection system according to claim 8, wherein the host computer is a diagnostic instrument.