Resistance data acquisition circuit, device and system

Abstract

The utility model provides a resistance data acquisition circuit, resistance data acquisition equipment and a resistance data acquisition system. The resistance data acquisition circuit comprises a data acquisition module, a switching module and a processor module, the circuit switching module comprises a first terminal, a second terminal and a switchable terminal; the first terminal and the second terminal are electrically connected with a positive electrode and a negative electrode of a to-be-collected battery pack respectively; the control end of the switchable terminal is electrically connected with the output end of the data acquisition module, so that the switchable terminal is electrically connected with the first terminal or the second terminal; the switchable terminal is electrically connected with the input end of the data acquisition module; the output end of the processor module is electrically connected with the input end of the data acquisition module; the output end of the data acquisition module is electrically connected with the input end of the processor module. According to the resistance data acquisition circuit provided by the utility model, resistance data acquisition is carried out through the same data acquisition module, the circuit design is simplified, the occupied space and electromagnetic interference of the circuit are reduced, and the circuit cost is effectively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to a resistance data acquisition circuit, equipment and system. Background Art

[0002] In a battery management system (BMS), resistance insulation data is used to monitor the insulation between the battery pack and the vehicle or other components. Existing insulation monitoring circuits typically use two independent circuits to collect data from the positive PACK+ and negative PACK- electrodes of the battery pack. The purpose is to:

[0003] 1) Improve system safety. Battery packs can experience malfunctions during use, such as short circuits or insulation failures. This can lead to a high voltage differential between the positive and negative terminals of the battery pack. If PACK+ and PACK- are connected to the same circuit for data acquisition, a malfunction could short-circuit the acquisition circuit or cause other safety issues. Separating the acquisition circuits effectively reduces this risk.

[0004] 2) Improved insulation detection accuracy. The insulation condition between the positive and negative terminals of a battery pack may vary slightly, such as due to poor battery contact or contamination. Connecting PACK+ and PACK- to the same circuit for data acquisition can mask these subtle differences or lead to misinterpretations. By separating the acquisition circuits, the insulation condition of the battery pack can be more accurately monitored.

[0005] 3) Facilitates current measurement. The current between PACK+ and PACK- is the output current of the battery pack, which typically requires separate measurement and monitoring. Separating PACK+ and PACK- into two separate circuits for current acquisition facilitates current measurement and avoids interference with insulation testing.

[0006] However, separating PACK+ and PACK- into two circuits for data acquisition also has the following problems:

[0007] 1) Space occupation. Separating two circuits for acquisition takes up more space, especially when the battery pack is large. This may limit the overall size and layout of the system, especially in space-constrained applications.

[0008] 2) Increased complexity. Separating two circuits for data acquisition requires designing additional circuits and sensors and ensuring their proper connection and operation, which may also increase the risk of system failure and maintenance difficulty.

[0009] 3) Electromagnetic interference: Due to the current difference between PACK+ and PACK-, additional electromagnetic radiation or sensitivity may be introduced, requiring appropriate electromagnetic interference (EMI) and electromagnetic compatibility (EMC) design, increasing the difficulty of system design. Utility Model Content

[0010] The utility model aims to provide a resistance data acquisition circuit, device and system to solve the above technical problems. While maintaining the advantages of the original acquisition circuit, it simplifies the circuit design, reduces the circuit's occupied space and electromagnetic interference, and effectively saves circuit costs.

[0011] In order to solve the above technical problems, the present invention provides a resistance data acquisition circuit, including a data acquisition module, a circuit switching module and a processor module; wherein: the circuit switching module includes a first terminal, a second terminal and a switchable terminal; the first terminal and the second terminal are electrically connected to the positive electrode and the negative electrode of the battery pack to be collected, respectively; the control end of the switchable terminal is electrically connected to the output end of the data acquisition module to make the switchable terminal electrically connected to the first terminal or the switchable terminal electrically connected to the second terminal; the switchable terminal is electrically connected to the input end of the data acquisition module; the output end of the processor module is electrically connected to the input end of the data acquisition module; the output end of the data acquisition module is electrically connected to the input end of the processor module.

[0012] In the above scheme, the circuit switching module can switch the switchable terminal to the first or second terminal according to actual data collection requirements, allowing the collection of positive or negative resistance data of the battery pack through the same data acquisition module. While maintaining the advantages of the existing data acquisition circuit, this circuit can collect resistance data through the same data acquisition module, simplifying the overall circuit design, reducing circuit space and electromagnetic interference, and effectively saving circuit component costs.

[0013] Furthermore, the circuit switching module is a MOSFET switch module or a relay switch module.

[0014] In the above solution, the circuit switching module can be implemented as a switch module. By inputting a control signal into the corresponding switch module to cause the switch module to switch, the switchable terminal can be electrically connected to the first terminal or the second terminal. This achieves the electrical connection between the positive electrode or negative electrode of the battery pack to be collected and the data collection module, thereby enabling the same data collection module to collect resistance data of the positive electrode or negative electrode of the battery pack to be collected.

[0015] Furthermore, the data acquisition module includes a signal selection submodule, an isolation submodule and an analog-to-digital conversion submodule; wherein: the input end of the signal selection submodule is electrically connected to the output end of the processor module, and the output end of the signal selection submodule is electrically connected to the control end of the switchable terminal; the input end of the isolation submodule is electrically connected to the switchable terminal, and the output end of the isolation submodule is electrically connected to the input end of the analog-to-digital conversion submodule; and the output end of the analog-to-digital conversion submodule is electrically connected to the input end of the processor module.

[0016] In the above scheme, the signal selection submodule is used to select the collected signal, and its selection signal comes from the processor module; the isolation submodule is used to isolate between high and low voltages, thereby realizing circuit protection; the analog-to-digital conversion submodule is used to convert the collected analog signal into a digital signal for use by the processor module.

[0017] Among them, the specific collection principle of the data acquisition module is:

[0018] When the processor module sends the signal selection submodule a selection signal of PACK+, the acquisition module is required to collect resistance and insulation data for PACK+. Similarly, if the selection signal is PACK-, the acquisition module is required to collect resistance and insulation data for PACK-. After receiving the selection signal, the signal selection submodule issues a corresponding control signal to switch the switchable terminal to the terminal corresponding to the selection signal in order to collect data from the corresponding terminal. The collected high-voltage signal is isolated from the low-voltage signal by the isolation submodule and then output to the analog-to-digital conversion submodule for signal conversion. This converts the analog signal into a digital signal and transmits it to the processor module.

[0019] Furthermore, the processor module is a microprocessor module or other logic processing module.

[0020] In the above solution, the processor module can be implemented as a microprocessor module, while other logic processing modules such as a single-chip microcomputer can also be implemented. It is used to send selection signals to the signal selection submodule to control the switching of the circuit switching module, and is also used to receive and process collected data. The processor module can design a corresponding data processing algorithm and process the collected data to accurately determine whether the battery pack insulation is normal.

[0021] Furthermore, the resistance data acquisition circuit also includes a storage module, which is electrically connected to the processor module.

[0022] In the above solution, the storage module can store the collected data received by the processor module to facilitate subsequent data analysis and comparison.

[0023] Furthermore, the resistance data acquisition circuit also includes a display module, and an input end of the display module is electrically connected to an output end of the processor module.

[0024] In the above solution, the display module can provide an independent display page to display the collected data received by the processor module in real time, and display the relevant inputs processed by the processor module, such as abnormal insulation conditions, so that users can obtain information on the insulation status of the battery pack intuitively, quickly, accurately and promptly, thereby improving work efficiency.

[0025] The utility model also provides a resistance data acquisition device, which includes the above-mentioned resistance data acquisition circuit.

[0026] The utility model also provides a resistance data acquisition system, comprising the resistance data acquisition circuit and an alarm module as described above; the control end of the alarm module is electrically connected to the output end of the processor module.

[0027] In the above solution, the alarm module can be triggered according to whether the information of the insulation status obtained by the processor module is abnormal, so as to realize timely warning of abnormal conditions and facilitate further adoption of corresponding protection measures.

[0028] Furthermore, the resistance data acquisition system also includes a communication module; the communication module is data-interconnected with the processor module, and the communication module is communicatively connected with an external terminal.

[0029] In the above scheme, the system can monitor the working status of each module in the system, control the status of the circuit switching module, and process and store the collected insulation resistance data. All the acquired data can be transmitted to the external terminal through the communication module, and the information of the external terminal can also be received through the communication module. That is, the system can exchange information with the external terminal through the communication module.

[0030] Furthermore, the resistance data acquisition system also includes a data transmission module and a cloud server; the data transmission module is data-interconnected with the processor module, and the data transmission module is data-interconnected with the cloud server.

[0031] In the above solution, the data acquired by the system can be uploaded to the cloud server through the data transmission module to achieve cloud storage of data. In actual use, users only need to log in to directly access the data stored on the cloud server, making it convenient to obtain and analyze data. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A connection diagram of a resistance data acquisition circuit module provided by one embodiment of the present utility model;

[0033] Figure 2 A schematic diagram of the structure of a data acquisition module provided in one embodiment of the present utility model;

[0034] Figure 3This is a schematic diagram of the architecture of a resistance data acquisition system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See Figure 1 This embodiment provides a resistance data acquisition circuit, including a data acquisition module, a circuit switching module and a processor module; wherein: the circuit switching module includes a first terminal, a second terminal and a switchable terminal; the first terminal and the second terminal are electrically connected to the positive electrode and the negative electrode of the battery pack to be collected, respectively; the control end of the switchable terminal is electrically connected to the output end of the data acquisition module to make the switchable terminal electrically connected to the first terminal or the switchable terminal electrically connected to the second terminal; the switchable terminal is electrically connected to the input end of the data acquisition module; the output end of the processor module is electrically connected to the input end of the data acquisition module; and the output end of the data acquisition module is electrically connected to the input end of the processor module.

[0037] In this embodiment, the circuit switching module can switch the switchable terminal to the first terminal or the second terminal according to actual data collection requirements, allowing the collection of resistance data from the positive or negative electrode of the battery pack to be achieved through the same data collection module. While maintaining the advantages of the existing data collection circuit, this circuit can collect resistance data through the same data collection module, simplifying the overall circuit design, reducing circuit space and electromagnetic interference, and effectively saving circuit component costs.

[0038] It should be noted that the first terminal, the second terminal and the switchable terminal are proposed for the convenience of describing this embodiment. In actual use, the first terminal / second terminal actually refers to the terminal that is actually connected to the positive / negative pole of the battery pack to be collected by the circuit switching module.

[0039] Furthermore, the circuit switching module is a MOSFET switch module or a relay switch module.

[0040] In this embodiment, the circuit switching module can be implemented as a switch module. By inputting a control signal into the corresponding switch module to cause the switch module to switch, the switchable terminal can be electrically connected to the first terminal or the second terminal, thereby electrically connecting the positive electrode or negative electrode of the battery pack to be collected to the data collection module, thereby enabling the same data collection module to collect resistance data of the positive electrode or negative electrode of the battery pack to be collected.

[0041] It should be noted that using a switch module to implement the circuit switching module function is only one embodiment; other devices capable of circuit switching can also achieve the corresponding function. By controlling the state of the circuit switching module, the electrode corresponding to the insulation resistance value to be collected can be selected. This circuit switching module can be a reliable, high-precision selection switch circuit, ensuring that there is no signal distortion or interference during the switching process.

[0042] Further, see Figure 2 The data acquisition module includes a signal selection submodule, an isolation submodule and an analog-to-digital conversion submodule; wherein: the input end of the signal selection submodule is electrically connected to the output end of the processor module, and the output end of the signal selection submodule is electrically connected to the control end of the switchable terminal; the input end of the isolation submodule is electrically connected to the switchable terminal, and the output end of the isolation submodule is electrically connected to the input end of the analog-to-digital conversion submodule; and the output end of the analog-to-digital conversion submodule is electrically connected to the input end of the processor module.

[0043] In this embodiment, the signal selection submodule is used to select the collected signal, and its selection signal comes from the processor module; the isolation submodule is used to isolate between high and low voltages, thereby realizing protection of the circuit; the analog-to-digital conversion submodule is used to convert the collected analog signal into a digital signal for use by the processor module.

[0044] Among them, the specific collection principle of the data acquisition module is:

[0045] When the processor module sends the signal selection submodule a selection signal of PACK+, the acquisition module is required to collect resistance and insulation data for PACK+. Similarly, if the selection signal is PACK-, the acquisition module is required to collect resistance and insulation data for PACK-. After receiving the selection signal, the signal selection submodule issues a corresponding control signal to switch the switchable terminal to the terminal corresponding to the selection signal in order to collect data from the corresponding terminal. The collected high-voltage signal is isolated from the low-voltage signal by the isolation submodule and then output to the analog-to-digital conversion submodule for signal conversion. This converts the analog signal into a digital signal and transmits it to the processor module.

[0046] It should be noted that the data acquisition module can be a high-precision, stable insulation resistance measurement circuit to ensure the accuracy and reliability of the measurement results. The data acquisition module can accurately measure the insulation resistance between the selected electrodes and convert it into a digital signal for use by the processor module.

[0047] Furthermore, the processor module is a microprocessor module or other logic processing module.

[0048] In this embodiment, the processor module can be implemented as a microprocessor module, or other logic processing modules such as a single-chip microcomputer. It is used to send selection signals to the signal selection submodule to control the switching of the circuit switching module, and to receive and process collected data. The processor module can design corresponding data processing algorithms and process the collected data, for example, setting thresholds to determine whether the insulation condition is normal, thereby accurately determining whether the battery pack insulation condition is normal.

[0049] Furthermore, the resistance data acquisition circuit also includes a storage module, which is electrically connected to the processor module.

[0050] In this embodiment, the storage module can store the collected data received by the processor module to facilitate subsequent data analysis and comparison.

[0051] Furthermore, the resistance data acquisition circuit also includes a display module, and an input end of the display module is electrically connected to an output end of the processor module.

[0052] In this embodiment, the display module can provide an independent display page to display the collected data received by the processor module in real time, and display the relevant inputs processed by the processor module, such as abnormal insulation conditions, so that users can obtain information on the insulation status of the battery pack intuitively, quickly, accurately and promptly, thereby improving work efficiency.

[0053] The resistance data acquisition circuit proposed in this embodiment utilizes only a single shared data acquisition module, significantly reducing the overall circuit structure and cost. This effectively reduces the size of the circuit board and the overall footprint, making the circuit more convenient to use and install. Furthermore, the shared data acquisition module for both PACK+ and PACK- effectively simplifies circuit design and maintenance, requiring only the design and debugging of a single data acquisition module and the processing of a single input signal, thus reducing circuit complexity and the risk of failure. Because only a single data acquisition module is used for data acquisition, current differences are minimized, reducing electromagnetic radiation and sensitivity, and improving data acquisition accuracy.

[0054] This embodiment further provides a resistance data acquisition device, which includes the above-mentioned resistance data acquisition circuit.

[0055] It should be noted that, in actual application, the resistance data acquisition device is a carrier that includes a resistance data acquisition circuit. The carrier may have an external protection object and may also be able to realize other circuit functions.

[0056] See Figure 3This embodiment further provides a resistance data acquisition system, comprising the resistance data acquisition circuit and an alarm module as described above; the control end of the alarm module is electrically connected to the output end of the processor module.

[0057] In this embodiment, the alarm module can be triggered according to whether the information of the insulation status obtained by the processor module is abnormal, so as to realize timely warning of abnormal conditions and facilitate further adoption of corresponding protective measures.

[0058] In this embodiment, the resistance data acquisition system can be a reliable and efficient system that can ensure the correct selection and processing of acquired data and can perform necessary judgments and protective measures.

[0059] Furthermore, the resistance data acquisition system also includes a communication module; the communication module is data-interconnected with the processor module, and the communication module is communicatively connected with an external terminal.

[0060] In this embodiment, the system can monitor the working status of each module in the system, control the status of the circuit switching module, and process and store the collected insulation resistance data. All the acquired data can be transmitted to the external terminal through the communication module, and the information of the external terminal can also be received through the communication module. That is, the system can exchange information with the external terminal through the communication module.

[0061] Furthermore, the resistance data acquisition system also includes a data transmission module and a cloud server; the data transmission module is data-interconnected with the processor module, and the data transmission module is data-interconnected with the cloud server.

[0062] In this embodiment, the data acquired by the system can be uploaded to the cloud server through the data transmission module to realize cloud storage of data. When actually using it, users only need to log in to directly access the data stored on the cloud server, which is convenient for data acquisition and analysis.

[0063] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A resistance data acquisition circuit, comprising a data acquisition module; characterized in that: It also includes a circuit switching module and a processor module; wherein: The circuit switching module includes a first terminal, a second terminal and a switchable terminal; The first terminal and the second terminal are electrically connected to the positive electrode and the negative electrode of the battery pack to be collected, respectively; The control end of the switchable terminal is electrically connected to the output end of the data acquisition module, so that the switchable terminal is electrically connected to the first terminal or the switchable terminal is electrically connected to the second terminal; The switchable terminal is electrically connected to the input end of the data acquisition module; The output end of the processor module is electrically connected to the input end of the data acquisition module; The output end of the data acquisition module is electrically connected to the input end of the processor module.

2. The resistance data acquisition circuit according to claim 1, characterized in that: The circuit switching module is a MOSFET switch module or a relay switch module.

3. The resistance data acquisition circuit according to claim 1, characterized in that: The data acquisition module includes a signal selection submodule, an isolation submodule and an analog-to-digital conversion submodule; wherein: The input end of the signal selection submodule is electrically connected to the output end of the processor module, and the output end of the signal selection submodule is electrically connected to the control end of the switchable terminal; The input end of the isolation submodule is electrically connected to the switchable terminal, and the output end of the isolation submodule is electrically connected to the input end of the analog-to-digital conversion submodule; The output end of the analog-to-digital conversion submodule is electrically connected to the input end of the processor module.

4. The resistance data acquisition circuit according to claim 3, characterized in that: The processor module is a microprocessor module or other logic processing module.

5. The resistance data acquisition circuit according to claim 1, characterized in that: It also includes a storage module, which is electrically connected to the processor module.

6. The resistance data acquisition circuit according to claim 1, characterized in that: It also includes a display module, wherein the input end of the display module is electrically connected to the output end of the processor module.

7. Resistance data acquisition device, characterized in that, The resistance data acquisition device comprises the resistance data acquisition circuit according to any one of claims 1 to 6.

8. Resistance data acquisition system, characterized in that, The resistance data acquisition circuit according to any one of claims 1 to 6 further comprises an alarm module; the control end of the alarm module is electrically connected to the output end of the processor module.

9. The resistance data acquisition system according to claim 8, characterized in that: It also includes a communication module; the communication module is data-interconnected with the processor module, and the communication module is communicatively connected with an external terminal.

10. The resistance data acquisition system according to claim 9, characterized in that: It also includes a data transmission module and a cloud server; the data transmission module is data-interconnected with the processor module, and the data transmission module is data-interconnected with the cloud server.

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