Lithium battery internal resistance tester

Abstract

The utility model discloses a lithium battery internal resistance tester. Comprising a first port assembly, a second port assembly, an MCU circuit, and a power supply circuit, a voltage internal resistance test board, a user interaction interface, a self-checking circuit, an electromagnetic interference filter, a card reader interface circuit, a warning circuit, a wireless communication assembly and an optocoupler isolation interface circuit which are respectively connected with the MCU circuit. One end of the first port assembly is connected with the voltage internal resistance test board, the other end of the first port assembly is connected with a tested battery, and the optical coupler isolation interface circuit is connected with the second port assembly. According to the lithium battery internal resistance tester provided by the embodiment of the utility model, the first port assembly is connected with the voltage internal resistance test board, so that the accuracy and stability of signals in the test process can be ensured, and meanwhile, the optocoupler isolation interface circuit is connected with the second port assembly; the electrical isolation and signal transmission characteristics of the optical coupler isolation interface circuit jointly enhance the stability of the system.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lithium battery internal resistance tester. Background Art

[0002] As the application of lithium batteries becomes more and more extensive, lithium battery internal resistance tester, as a battery performance testing equipment, has been widely used in many fields.

[0003] In existing lithium battery internal resistance testers, electromagnetic interference between the test board and other circuits can cause test interruptions and test circuit instability, leading to inaccurate measurement results. Ensuring the stability of the test circuit is crucial for accurate measurement results in lithium battery internal resistance testers, and this has become a pressing technical challenge for those skilled in the art. Utility Model Content

[0004] The utility model provides a lithium battery internal resistance tester, which solves the technical problems of test interruption and inaccurate test results by designing the internal circuit of the lithium battery internal resistance tester, so as to realize the function of stabilizing the test circuit.

[0005] In order to solve the above technical problems, the embodiment of the present utility model provides a lithium battery internal resistance tester, including a first port assembly, a second port assembly, an MCU circuit and a power supply circuit respectively connected to the MCU circuit, a voltage internal resistance test board, a user interaction interface, a self-test circuit, an electromagnetic interference filter, a card reader interface circuit, an alarm circuit, a wireless communication component and an optocoupler isolation interface circuit;

[0006] One end of the first port component is connected to the voltage internal resistance test board, and the other end of the first port component is connected to the battery under test;

[0007] The optical coupling isolation interface circuit is connected to the second port component.

[0008] As one preferred solution, the warning circuit includes a buzzer indication circuit and a light alarm circuit, and the output end of the self-test circuit is connected to the buzzer indication circuit and the light alarm circuit respectively.

[0009] As one of the preferred solutions, the lithium battery internal resistance tester further includes a disconnection protection circuit, and the control end of the disconnection protection circuit is connected to the output end of the self-test circuit.

[0010] As one preferred solution, the user interaction interface is a programmable LCD touch screen.

[0011] As one of the preferred solutions, the model of the programmable LCD touch screen is TJC483T035_011R.

[0012] As one of the preferred solutions, the model of the voltage internal resistance test board is YR1035+.

[0013] As one of the preferred solutions, the model of the wireless communication component is a 433 wireless communication module.

[0014] As one of the preferred solutions, the wireless communication component includes a cloud communication port and a local communication port.

[0015] As one of the preferred solutions, the first port component is a 4-core aviation terminal.

[0016] As one of the preferred solutions, the second port component is a 5-core aviation terminal.

[0017] Compared with the prior art, the beneficial effects of the embodiments of the present invention are at least one of the following:

[0018] (1) The 4-core aviation terminal inside the lithium battery internal resistance tester is connected to the voltage internal resistance test board. It not only has good conductivity, but also can withstand certain mechanical stress and vibration, thus ensuring the accuracy and stability of the signal during the test;

[0019] (2) The optocoupler isolation interface circuit is connected to the 5-core aviation terminal. The electrical isolation and signal transmission characteristics of the optocoupler isolation interface circuit, as well as the high reliability and stability of the 5-core aviation terminal, enhance the stability of the system.

[0020] (3) The electromagnetic interference filter ensures the stability of circuit signal transmission by suppressing electromagnetic interference, thereby ensuring the accuracy of test results;

[0021] (4) The lithium battery internal resistance tester is also designed with a self-test circuit to automatically detect internal circuit faults, ensuring the stable operation of the system and improving the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the internal structure of a lithium battery internal resistance tester in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the connection of some internal modules of a lithium battery internal resistance tester in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of an MCU circuit in one embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of a wireless communication component in one embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of a warning circuit in one embodiment of the present utility model;

[0027] Figure 6 It is a schematic diagram of an optocoupler isolation interface circuit in one embodiment of the present utility model.

[0028] Reference numerals:

[0029] Among them, 1. MCU circuit; 2. Power supply circuit; 3. Voltage and internal resistance test board; 4. User interaction interface; 5. Self-test circuit; 6. Electromagnetic interference filter; 7. Card reader interface circuit; 8. Warning circuit; 9. Wireless communication component; 10. Optocoupler isolation interface circuit; 11. First port component; 12. Second port component. DETAILED DESCRIPTION

[0030] The following will be combined with the 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.

[0031] In the description of this application, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this utility model have the same meanings as those commonly understood by those skilled in the art. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. For those skilled in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.

[0033] This utility model provides a lithium battery internal resistance tester. Figure 1 and Figure 2 , Figure 1 The figure shows the internal structure of a lithium battery internal resistance tester in one embodiment of the present invention. Figure 2The figure shows a schematic diagram of the connection of some internal modules of the lithium battery internal resistance tester in one embodiment of the present invention, including a first port component 11, a second port component 12, an MCU circuit 1 and a power supply circuit 2 connected to the MCU circuit 1, a voltage internal resistance test board 3, a user interaction interface 4, a self-test circuit 5, an electromagnetic interference filter 6, a card reader interface circuit 7, an alarm circuit 8, a wireless communication component 9 and an optocoupler isolation interface circuit 10.

[0034] Specifically, the MCU circuit 1, namely the microcontroller unit (MCU) circuit, is a highly integrated circuit that includes a central processing unit (CPU), memory (RAM, ROM), and other multiple functions.

[0035] The MCU circuit 1 is also provided with a USART interface, and the MCU circuit 1 is connected to the voltage internal resistance test board 3, the card reader interface circuit 7, the wireless communication component 9 and the user interaction interface 3 respectively through the USART interface.

[0036] The voltage internal resistance test board 3 injects a certain current into the power supply or battery to be tested, and then measures the difference between the injected current and the output voltage of the power supply or battery to be tested, thereby calculating the internal resistance of the power supply or battery according to Ohm's law.

[0037] One end of the first port component 11 is connected to the voltage internal resistance test board 3, and the other end of the first port component 11 is connected to the battery under test. The first port component 11 is preferably a 4-core aviation terminal. The aviation terminal connected to the voltage internal resistance test board not only has good conductivity, but also can withstand certain mechanical stress and vibration, thereby ensuring the accuracy and stability of the signal during the test. The design of aviation terminals is usually easy to plug and unplug and lock, which makes them very suitable for test scenarios that require frequent connection and disconnection. In the internal resistance test, the use of aviation terminals can easily connect the power supply or battery to be tested, as well as the test instrument or equipment. This connection method not only simplifies the test process, but also improves the test efficiency.

[0038] The user interface 3 is the channel for information exchange between humans and computers. Users input information and perform operations on the computer through the interface, and the computer, in turn, provides information to the user through the interface for reading, analysis, and judgment. In this embodiment, the user interface 3 is a programmable LCD touchscreen, preferably model TJC483T035_011R. Alternatively, a natural language interface, a virtual reality interface, or a gesture interface may be used, but these are not specifically limited in this embodiment.

[0039] The lithium battery internal resistance tester also includes a self-test circuit 5 and an electromagnetic interference filter 6. The self-test circuit 5 can utilize a digital signal processing (DSP) chip, a microprocessor, or a microcontroller. The output of the self-test circuit 5 is connected not only to the control terminal of the warning circuit 8 but also to the control terminal of the disconnect protection circuit. The self-test circuit 5 automatically detects the circuit status and performance to ensure the normal operation and reliability of the internal circuitry of the internal resistance tester.

[0040] Electromagnetic interference between the test board and other circuits inside the lithium battery internal resistance tester may cause test interruption and test circuit instability, thereby leading to inaccurate measurement results. In order to reduce electromagnetic interference, differential signal transmission, low-pass filter and other technologies can be used to reduce electromagnetic interference. In this embodiment, electromagnetic interference is reduced by electromagnetic interference filter 6. Of course, a metal shielding box can also be used to surround the sensitive circuit or interference source with a metal box, which can effectively isolate the influence of the external electromagnetic field on the internal circuit.

[0041] This utility model provides a lithium battery internal resistance tester. Figures 3 to 6 , Figure 3 FIG. 1 is a schematic diagram of an MCU circuit in one embodiment of the present invention. Figure 4 FIG. 1 is a schematic diagram of a wireless communication component in one embodiment of the present invention. Figure 5 FIG. 1 is a schematic diagram of a warning circuit in one embodiment of the present invention. Figure 6 Shown is a schematic diagram of an optocoupler isolation interface circuit in one embodiment of the present utility model.

[0042] The wireless communication component 9 includes an antenna, a receiver and a transmitter. The transmitter converts the information to be sent into a signal form suitable for wireless transmission; the receiver is responsible for receiving the wireless signal received from the transmission medium and converting it into a usable information form; the antenna is responsible for converting the electromagnetic waves generated by the transmitter into wireless signals and radiating them into space. At the same time, it is also responsible for receiving the wireless signals received from space and converting them into signals that can be processed by the receiver.

[0043] In this embodiment, the wireless communication component 9 includes a cloud communication port and a local communication port. The cloud communication port uploads the measured battery data to a cloud database, while the local communication port transmits the battery data to a local database.

[0044] The lithium battery internal resistance tester also includes an alarm circuit 8, which includes a buzzer indicator circuit and a light alarm circuit. Specifically, the alarm unit refers to a device that can transmit alarm information, which is not specifically defined here. When an abnormal situation occurs, the buzzer indicator circuit and the light alarm circuit automatically generate sound and light, and different sounds and colors indicate different alarm levels or types.

[0045] The optocoupler isolation interface circuit 10 is primarily composed of a light-emitting diode (LED), a phototransistor (or photodiode), and related circuit components. One end of the optocoupler isolation interface circuit 10 is connected to the MCU circuit 1, and the other end is connected to the second port assembly 12. When the optocoupler isolation interface circuit 10 is connected to a 5-pin aviation terminal block, the electrical isolation characteristics of the optocoupler isolation interface circuit 10 effectively block the effects of external electrical noise and interference on the circuit, improving the system's anti-interference capability. Furthermore, the electrical isolation and signal transmission characteristics of the optocoupler isolation interface circuit 10, along with the high reliability and stability of the 5-pin aviation terminal block, enhance the stability of the system.

[0046] Compared with the prior art, the beneficial effects of the embodiments of the present invention are at least one of the following:

[0047] (1) The 4-core aviation terminal inside the lithium battery internal resistance tester is connected to the voltage internal resistance test board. It not only has good conductivity, but also can withstand certain mechanical stress and vibration, thus ensuring the accuracy and stability of the signal during the test;

[0048] (2) The optocoupler isolation interface circuit is connected to the 5-core aviation terminal. The electrical isolation and signal transmission characteristics of the optocoupler isolation interface circuit, as well as the high reliability and stability of the 5-core aviation terminal, enhance the stability of the system.

[0049] (3) The electromagnetic interference filter ensures the stability of circuit signal transmission by suppressing electromagnetic interference, thereby ensuring the accuracy of test results;

[0050] (4) The lithium battery internal resistance tester is also designed with a self-test circuit to automatically detect internal circuit faults, ensuring the stable operation of the system and improving the reliability of the equipment.

[0051] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A lithium battery internal resistance tester, characterized in that: It includes a first port component, a second port component, an MCU circuit, and a power supply circuit, a voltage and internal resistance test board, a user interaction interface, a self-test circuit, an electromagnetic interference filter, a card reader interface circuit, an alarm circuit, a wireless communication component, and an optocoupler isolation interface circuit respectively connected to the MCU circuit; One end of the first port component is connected to the voltage internal resistance test board, and the other end of the first port component is connected to the battery under test; The optical coupling isolation interface circuit is connected to the second port component.

2. The lithium battery internal resistance tester according to claim 1, characterized in that: The warning circuit includes a buzzer indication circuit and a light alarm circuit, and the output end of the self-test circuit is connected to the buzzer indication circuit and the light alarm circuit respectively.

3. The lithium battery internal resistance tester according to claim 1, wherein: The lithium battery internal resistance tester further comprises a disconnection protection circuit, wherein a control end of the disconnection protection circuit is connected to an output end of the self-test circuit.

4. The lithium battery internal resistance tester according to claim 1, wherein: The user interaction interface is a programmable LCD touch screen.

5. The lithium battery internal resistance tester according to claim 4, characterized in that: The model of the programmable LCD touch screen is TJC483T035_011R.

6. The lithium battery internal resistance tester according to claim 1, wherein: The model of the voltage internal resistance test board is YR1035+.

7. The lithium battery internal resistance tester according to claim 1, wherein: The model of the wireless communication component is 433 wireless communication module.

8. The lithium battery internal resistance tester according to claim 1, wherein: The wireless communication component includes a cloud communication port and a local communication port.

9. The lithium battery internal resistance tester according to claim 1, wherein: The first port component is a 4-core aviation terminal.

10. The lithium battery internal resistance tester according to claim 1, wherein: The second port component is a 5-core aviation terminal.

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