An automobile storage battery static current measuring device

Abstract

The utility model discloses a kind of static current measuring devices of automobile battery, including switching circuit, the switching circuit includes the test circuit and protection circuit of parallel arrangement;The test circuit includes the test switch module S1 of series arrangement, test resistance and test coil, and the test coil includes multiple turns coil unit;The protection circuit is provided with protection switch module;The test circuit is provided with first sampling module, for detecting and outputting the basic electrical quantity of test resistance;The parallel node of both ends of the switching circuit is respectively connected with first interface and second interface, and the first interface is used to connect whole vehicle electrical apparatus, and the second interface is used to connect the electrode of battery one. The utility model passes through test coil and generates current amplification effect, uses clamp meter to carry out non-contact measurement, and static current can be accurately measured;Protection circuit is used as dredging circuit by being arranged in parallel with test circuit, and sudden large current can be coped with, and test circuit is protected.

Description

Technical Field

[0001] This utility model relates to the field of electrostatic testing technology, and more specifically, to a device for measuring the static current of an automobile battery. Background Technology

[0002] In vehicle electrostatic discharge (ESD) testing, it is often required to measure the static current of the car battery before and after discharge. The change in static current before and after discharge is used to determine whether there is a failure. Static current is the weak current output by the battery when all vehicle electrical components are in a dormant state (typically a few milliamps to tens of milliamps). Static current is obtained by the following steps: turn off the vehicle and shut down all turn-off electrical components, lock the vehicle with the key, and wait for a period of time until all vehicle electrical components are in a dormant state. The current output by the battery at this point is the static current.

[0003] The common method for measuring the static current of a car battery is to use a multimeter set to a low current range. With the car battery still powered, connect the two probes to the negative terminal of the battery and the connecting cable. Then disconnect the cable from the terminal. This way, the multimeter is successfully connected in series with the battery circuit while the vehicle is powered on. The advantage of this method is that multimeters are readily available and only require some auxiliary connectors. However, the disadvantage is that the current output from the battery fluctuates greatly during the transition from the vehicle's electrical system to the ignition key being pressed and the car being locked, and then to the point where the electrical system reaches its static current state. This fluctuating current range can take anywhere from tens of amperes to several amperes, and it can take anywhere from tens of minutes to two hours to reach the final static current of tens to several milliamperes. This large and rapid current fluctuation puts a strain on the multimeter's range-switching capabilities, which is unsustainable for models with manually adjustable ranges. Furthermore, the multimeter's testing accuracy is relatively low, resulting in inaccurate measurement results.

[0004] Specialized automotive electrostatic current testing uses specialized measuring equipment. However, electrostatic current testing is only a small part of electrostatic discharge (ESD) testing. Purchasing specialized ESD equipment for ESD testing is expensive, and the equipment is complex and inconvenient to use. Utility Model Content

[0005] To solve at least one of the above-mentioned technical problems, this utility model provides a car battery static current measuring device, which is equipped with a test coil. The static current is amplified by the test coil and then measured by a clamp meter.

[0006] The technical problem solved by this utility model is addressed by the following technical solution:

[0007] A vehicle battery static current measuring device includes a switching circuit, which comprises a test circuit and a protection circuit connected in parallel. The test circuit includes a test switch module S1, a test resistor, and a test coil connected in series, the test coil comprising a multi-turn coil unit. The protection circuit includes a protection switch module. The test circuit includes a first sampling module for detecting and outputting basic electrical parameters of the test resistor. The parallel nodes at both ends of the switching circuit are respectively connected to a first interface and a second interface. The first interface is used to connect to the vehicle's electrical system, and the second interface is used to connect to one electrode of the battery.

[0008] Furthermore, the protection circuit includes a short-circuit circuit connected in parallel with the test circuit, the short-circuit circuit including a short-circuit switch module S3; and / or,

[0009] The protection circuit includes a transition circuit connected in parallel with the test circuit, and the transition circuit includes a transition switch module and a transition resistor connected in series.

[0010] Furthermore, the transition circuit includes a transition switch module and a transition resistor connected in series, wherein the resistance value of the transition resistor is less than the resistance value of the test resistor; or,

[0011] The transition circuit includes multiple circuits connected in parallel. Each transition circuit includes a transition switch module and a transition resistor connected in series. The resistance value of each transition resistor is less than the resistance value of the test resistor, and the resistance values ​​of each transition resistor decrease sequentially.

[0012] Furthermore, each of the transition circuits is provided with a second sampling module corresponding to each transition resistor, which is used to detect and output the basic electrical parameters of the transition resistor, and can monitor the voltage drop or current of the transition resistor; preferably, the test resistor and the first sampling module are set as the first sampling resistor, and each of the transition resistors and the corresponding second sampling module are set as the corresponding second sampling resistor, and each resistor and the corresponding sampling module are modularly integrated.

[0013] Furthermore, the measuring device also includes a controller, and the test switch module S1 and the first sampling module are electrically connected to the controller; when the protection circuit includes a transition circuit, the transition switch module is electrically connected to the controller; when the transition circuit includes a second sampling module, the second sampling module is electrically connected to the controller.

[0014] Furthermore, the controller includes multiple microcontrollers corresponding to the test circuit and / or transition circuit. Each microcontroller includes a signal receiving module, a comparison module, and a signal output module. The signal receiving module of each microcontroller is connected to the corresponding first sampling module and second sampling module, and the signal output module of each microcontroller is connected to the corresponding test switch module S1 and transition switch module, making the control more flexible.

[0015] Furthermore, the controller includes a power supply module, which includes a power supply interface for connecting a power source to supply power to the controller.

[0016] Furthermore, the measuring device includes a housing, with the switching circuit and controller located inside the housing, and the test coil located outside the housing to protect the circuit and facilitate the measurement of the test coil current using a clamp meter.

[0017] Furthermore, the measuring device also includes a display device, with the first sampling module and the second sampling module electrically connected to the display device; preferably, the display device includes a touch screen, with the signal output modules of each microcontroller electrically connected to the touch screen.

[0018] Furthermore, the switching circuit also includes a capacitor C connected in parallel with the test circuit to filter pulsating current.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] (1) The measuring device generates current amplification effect through the test coil, and the static current can be accurately measured by non-contact measurement using a clamp meter; in order to cope with the large current of the vehicle electrical system when it is not dormant, a protection circuit is set in parallel with the test circuit as a conduction-clearing circuit, which can protect the test circuit and cope with the small current measurement of sudden large current.

[0021] (2) The measuring device has a simple structure and low cost. During measurement, the measuring device is connected in series in the battery circuit at once. The battery does not need to be disconnected again during the entire static current measurement process, making the operation simple and convenient.

[0022] (3) The measuring device controls the switch module to disconnect via the controller, which disconnects more quickly, further improving the safety of the circuit and preventing the circuit from being overloaded and damaging electronic components. Attached Figure Description

[0023] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.

[0024] Figure 1 This is a schematic diagram of one embodiment of the electrostatic current measuring device for automobile batteries according to this utility model.

[0025] Figure 2 This is a schematic diagram of another embodiment of the electrostatic current measuring device for automobile batteries according to this utility model.

[0026] Figure 3 This is a schematic diagram of another embodiment of the electrostatic current measuring device for automobile batteries according to this utility model.

[0027] Figure 4 This is a schematic diagram illustrating an embodiment of the electrostatic current measuring device for automotive batteries according to this utility model.

[0028] Figure 5 This is a schematic diagram illustrating another embodiment of the electrostatic current measuring device for automotive batteries according to this utility model.

[0029] Figure 6 This is a structural block diagram of the controller for the electrostatic current measuring device for automobile batteries of this utility model.

[0030] In the diagram: 100, switching circuit; 11, first interface; 12, second interface; 13, third interface; 14, test coil; 200, controller; 21, microcontroller; 211, signal receiving module; 212, comparison module; 213, signal output module; 300, housing; 400, display device; 500, vehicle electrical components; 600, battery; 700, clamp meter. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments of this disclosure to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0032] In the description of this utility model, it should be noted that the term "comprising" and its variations indicate an open-ended inclusion, i.e., "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "and / or" when used to list two or more items means that it may include any one of the listed items, or any combination of two or more of the listed items. Furthermore, in the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] This utility model provides a device for measuring the static current of a car battery, referenced. Figures 1-3 As shown, the circuit includes a switching circuit 100, which comprises a test circuit and a protection circuit connected in parallel. The test circuit includes a test switch module S1, a test resistor, and a test coil 14 connected in series, with the test coil 14 comprising a multi-turn coil unit. The protection circuit includes a protection switch module. The test circuit also includes a first sampling module for detecting and outputting the basic electrical parameters of the test resistor. The parallel nodes at both ends of the switching circuit 100 are respectively connected to a first interface 11 and a second interface 12. The first interface 11 is used to connect to the vehicle electrical system 500, and the second interface 12 is used to connect to one electrode of the battery 600.

[0034] refer to Figure 4 As shown, when using this measuring device, the vehicle is turned off and all switchable electrical components 500 are shut off. After locking the vehicle with the key, the electrical components 500 are disconnected from the battery 600. Then, the measuring device is connected between the electrical components 500 and the battery 600. For example, the first interface 11 is connected to the electrical component 500, and the second interface 12 is connected to the negative terminal of the battery 600, thus connecting the measuring device between the electrical components 500 and the negative terminal of the battery 600. Alternatively, the measuring device can be connected between the electrical components 500 and the positive terminal of the battery 600.

[0035] The basic electrical parameters of the test circuit can be set to the voltage drop across the test resistor or the current flowing through the test resistor, i.e., the voltage or current of the test circuit. After connecting the measuring device between the vehicle electrical system 500 and the battery 600, the operator activates the protection circuit. After waiting for a period of time, the operator can close the test switch module S1. The first sampling module collects the voltage drop or current of the test resistor and outputs it to the display device 400, such as the instrument panel or display screen. The display device 400 can be set separately or integrated into the first sampling module. When the collected voltage drop or current is greater than or equal to the preset threshold, it indicates that the current flowing through the test circuit is too large. The operator immediately disconnects the test switch module S1 and then reconnects the protection circuit. The protection circuit has a greater current carrying capacity than the test circuit, which can maintain the continuity of the battery 600 circuit, conduct current, and simultaneously protect the test coil 14. Repeat the above operation until the test switch module S1 is closed. If the voltage drop or current collected is less than the preset threshold, the test switch module S1 can be kept closed. The operator can use a DC current clamp meter 700 (hereinafter referred to as clamp meter 700) to measure the current of the test coil 14. When the test current reaches the stable current I within a certain period of time, the static current i can be calculated by the formula i=I / N, where N is the number of turns of the coil unit of the test coil 14.

[0036] The test coil 14 can be made by winding a wire into a multi-turn coil. The test coil 14 amplifies the weak static current to the level that the clamp meter 700 can accurately measure. For example, a static current of a few milliamps can be amplified to hundreds of milliamps by passing a coil bundle of one hundred turns, and then the static current can be accurately measured by the clamp meter 700.

[0037] The number of turns N in the coil unit of test coil 14 can be set from 20 to 200 turns. For example, it can be set to 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200 turns, etc., as needed. Because test coil 14 has a large number of turns, it generally uses a thinner wire with a lower current-carrying capacity. The protection circuit is connected with a thicker wire, which has a greater current-carrying capacity than test coil 14. When the vehicle electrical system 500 is not in sleep mode and the vehicle current is high, a protection circuit with a larger current capacity can be activated to divert the current until the vehicle electrical system 500 enters sleep mode and the current drops to a certain level. Then, switch back to the test circuit and use a clamp meter 700 to measure the static current, thereby preventing excessive current in the test circuit from damaging test coil 14.

[0038] It is important to note that a clamp meter 700 with an appropriate range can be selected based on the product of the carrying current I0 of the test coil 14 and the number of turns N of the coil unit. During electrostatic discharge (ESD) testing, a clamp meter 700 with an appropriate resolution also needs to be selected based on the required rate of change of the electrostatic current before and after the ESD test.

[0039] It is important to understand that closing the switch module of any branch of the switching circuit 100 means closing the switch module of that branch, while the switch modules of other branches are all open.

[0040] In some embodiments, such as Figures 1-3 As shown, the protection circuit may include a short-circuit circuit connected in parallel with the test circuit, the short-circuit circuit including a short-circuit switch module S3. The protection circuit may also include a transition circuit connected in parallel with the test circuit, the transition circuit including a transition switch module and a transition resistor connected in series. The protection circuit may also simultaneously include a short-circuit circuit and a transition circuit connected in parallel with the test circuit. The test switch module S1 can be set to a normally open state. When the protection circuit includes a short-circuit circuit, the short-circuit switch module S3 can be set to a normally closed state. When the measuring device is connected to the battery 600 circuit, the test circuit is disconnected, and the short-circuit circuit is closed, thus protecting the test circuit and preventing excessive current flowing through the test coil 14 when the measuring device is initially connected to the battery 600 circuit, which could cause coil overload damage.

[0041] In some embodiments, such as Figure 1 As shown, the transition circuit includes one, which comprises a transition switch module and a transition resistor arranged in series; or, as... Figure 3 As shown, the transition circuit includes multiple circuits connected in parallel, each transition circuit including a transition switch module and a transition resistor connected in series. When the protection circuit has only one transition circuit, the transition switch module can be set to a normally closed state. When the protection circuit has both a short-circuit circuit and a transition circuit, the short-circuit switch module S3 can be set to a normally closed state, and the transition switch module can be set to a normally open state. Of course, all switch modules can also be set to a normally open state. During operation, if the current flowing through the test circuit is too large after closing the test switch module S1, the short-circuit switch module S3 can be closed first, then the transition switch module can be closed, and then the test switch module S1 can be closed again.

[0042] The test resistor can be selected according to the current carrying capacity of the test coil 14, ensuring that the current carrying capacity of the test resistor is greater than that of the test coil 14. Under the same voltage, the smaller the resistance value of the transition resistor, the larger the current in the transition circuit. When the transition circuit includes one resistor, the resistance value of the transition resistor is less than that of the test resistor. When the transition circuit includes multiple resistors connected in parallel, the resistance values ​​of each transition resistor are less than that of the test resistor, and the resistance values ​​of each transition resistor decrease sequentially. For example, the test resistor can be set to 100Ω, and the transition resistors can be set to 10Ω, 5Ω, 1Ω, 0.5Ω, 0.1Ω, etc. During operation, the transition switch modules of the transition circuit with decreasing current carrying capacity can be closed sequentially at certain intervals to improve circuit safety.

[0043] In some embodiments, each transition circuit is provided with a second sampling module corresponding to each transition resistor, used to detect and output the basic electrical parameters of the transition resistor. When the transition switch module is closed, the second sampling module collects the voltage drop or current of the transition resistor and outputs it to a display device 400 such as an instrument panel or display screen. When the protection circuit includes only one transition circuit, the second sampling module can monitor the voltage drop or current of the transition resistor to roughly determine whether the test switch module S1 can be closed. When the protection circuit also includes a short-circuit circuit or includes multiple transition circuits, when the collected voltage drop or current is greater than or equal to a preset threshold, it indicates that the current flowing through the transition circuit is too large. The operator can immediately disconnect the transition switch module and then connect the short-circuit circuit or other transition circuits with stronger current carrying capacity.

[0044] Each resistor and its corresponding sampling module can be integrated as a sampling resistor. The test resistor and the first sampling module can be integrated as the first sampling resistor R1. Each transition resistor and its corresponding second sampling module can be integrated as the corresponding second sampling resistor. When there is one transition circuit, the transition resistor and the second sampling module are set as one, and the transition resistor and the second sampling module can be integrated as the second sampling resistor R2. When there are n transition circuits, the transition resistors and the second sampling modules are set as n respectively. Each transition resistor and its corresponding second sampling module can be integrated as the second sampling resistors R21, R22, ..., R2i, ..., R2n, and each transition switch module is set as S21, S22, ..., S2i, ..., S2n respectively, where n≥2, i≤n, and n and i are positive integers.

[0045] In some embodiments, reference Figure 2 and Figure 3As shown, the measuring device also includes a controller 200, and the test switch module S1 and the first sampling module are electrically connected to the controller 200; when the protection circuit includes a transition circuit, the transition switch module is electrically connected to the controller 200; when the transition circuit includes a second sampling module, the second sampling module is electrically connected to the controller 200.

[0046] Each switching module can use electromagnetic switches, or transistor switches such as BJT, MOSFET, IGBT, and FET, and can be controlled to disconnect by the controller 200.

[0047] like Figure 5 As shown, when using this measuring device, connect it to the circuit of the vehicle's electrical system 500 and battery 600, and turn on the controller 200. After waiting for a period of time, the operator closes the test switch module S1. When the controller 200 controls the test switch module S1 to open, it indicates that the test circuit current is too high. The operator can then repeatedly close the short-circuit switch module S3 or the transition switch module, and after a certain interval, close the test switch module S1 again until the controller 200 no longer controls the test switch module S1 to open. At this time, the clamp meter 700 can be used to measure the current of the test coil 14. When the test current reaches a stable current I within a certain period of time, the static current i can be calculated using the formula i=I / N, where N is the number of turns of the coil unit of the test coil 14.

[0048] In some embodiments, reference Figure 6 As shown, the controller 200 includes a plurality of microcontrollers 21 corresponding to the test circuit and / or transition circuit. Each microcontroller 21 includes a signal receiving module 211, a comparison module 212, and a signal output module 213. The signal receiving module 211 of each microcontroller 21 is connected to the corresponding first sampling module and second sampling module, and the signal output module 213 of each microcontroller 21 is connected to the corresponding test switch module S1 and transition switch module.

[0049] When the operator closes the switch module and connects the circuit, the sampling module sends the collected voltage or current signal of the corresponding circuit to the signal receiving module 211 of the corresponding microcontroller 21, and then to the corresponding comparison module 212. The comparison module 212 compares the received signal with the preset signal threshold and outputs the comparison result to the corresponding signal output module 213. The signal output module 213 outputs a level signal to the corresponding switch module. For example, after closing the test switch module S1, the test resistor of the test circuit collects the current of the circuit and sends the collected current signal to the corresponding signal receiving module 211. The signal receiving module 211 then sends the received current signal to the corresponding comparison module 212. The comparison module 212 compares the received current signal with a preset current threshold. When the received current signal is greater than or equal to the preset current threshold, the comparison module 212 outputs a high level to the corresponding signal output module 213, which then outputs a high level to the test switch module S1 to control the test switch module S1 to open. When the received current signal is less than the preset current threshold, the comparison module 212 outputs a low level to the corresponding signal output module 213, which then outputs a low level to the test switch module S1 to control the test switch module S1 to close. In this way, when the current passing through the test circuit is large, the controller 200 can automatically control the test switch module S1 to open immediately. Compared to the operator disconnecting the switch, the controller 200 controls the switch module to open more quickly, further improving the safety of the circuit and preventing overload damage to electronic components. Moreover, each switch module is controlled by a corresponding microcontroller 21, making control more flexible.

[0050] In some embodiments, the controller 200 includes a power supply module, which includes a power supply interface for connecting a power source to supply power to the controller 200.

[0051] The power supply can be a battery, AC power, or a 600-cell battery. The power supply powers the controller 200, which in turn powers the various switching modules and sampling modules. Depending on the controller 200 specifications, it can provide either 5V or 12V power. For example, when the controller 200 requires 5V, it can be directly powered by a battery, with a positive and negative contact for connecting to the battery. Alternatively, the power supply interface can be a USB interface, connected to 220V AC power via a USB cable and power adapter. When the controller 200 requires 12V, it can also be directly powered by the 600-cell battery. The power supply interface includes a second interface 12 and a third interface 13. The two power supply terminals of the power supply module are connected to the second interface 12 and the third interface 13, respectively. The third interface 13 is used to connect to the other electrode of the 600-cell battery. The third interface 13 can be directly connected to the other electrode of the 600-cell battery, or it can be connected to the other electrode of the battery 600-cell battery via a tee connector from the vehicle wiring harness.

[0052] When the controller 200 is powered by a battery or mains power, the first interface 11 can be connected to the vehicle electrical unit 500, and the second interface 12 can be connected to the negative terminal of the battery 600, thereby connecting the measuring device to the circuit of the vehicle electrical unit 500 and the battery 600. When the controller 200 is powered by the battery 600, the first interface 11 can be connected to the vehicle electrical unit 500, the second interface 12 can be connected to the negative terminal of the battery 600, and the third interface 13 can be connected to the positive terminal of the battery 600, thereby connecting the measuring device to the circuit of the vehicle electrical unit 500 and the battery 600, and powering the controller 200 through the battery 600.

[0053] In some embodiments, the measuring device includes a housing 300. The switching circuit 100 and controller 200 are disposed inside the housing 300 to protect the wiring. The test coil 14 is disposed outside the housing 300, allowing for convenient measurement of the current of the test coil 14 using a clamp meter 700. The test switch module S1, each transition switch module, and the short-circuit switch module S3 can also be disposed outside the housing 300 for convenient operation of the switch modules. The first interface 11, the second interface 12, and the third interface 13 are disposed on the housing 300 for convenient connection to the vehicle electrical system 500 and the battery 600.

[0054] In some embodiments, the measuring device further includes a display device 400, with the first sampling module and the second sampling module electrically connected to the display device 400. The display device 400 can display the voltage or current of the corresponding circuit acquired by each sampling module. Preferably, the display device 400 includes a touch screen, with the signal output modules 213 of each microcontroller 21 electrically connected to the touch screen. The operator can send opening and closing commands for each switch module to the signal output modules 213 of the controller 200 via the touch screen, enabling human-machine interaction control of the opening and closing of each switch module. The touch screen can also display the opening and closing status of each switch module, thereby reminding the operator of the current channel status through the human-machine interface.

[0055] Indicator lights can also be connected in series in each branch. The on / off state of the indicator lights can be used to observe which branch is in the conducting state. The indicator lights can be set on the box 300, and branch marks can be set next to the indicator lights. For example, the marks of each switch module, such as S1, S2, S3, etc., can be used as the marks of the branch.

[0056] In some embodiments, the switching circuit further includes a capacitor C connected in parallel with the test circuit. After the measuring device is connected to the battery 600 circuit, a pulsating current will be generated when the current reaches the static current level. By setting the capacitor C, the pulsating current can be filtered out, making it convenient to accurately measure the DC static current.

[0057] This measuring device has a simple structure and low cost, significantly saving money compared to purchasing specialized industrial equipment. During measurement, the device is connected in series in the battery 600 circuit once, and the battery 600 does not need to be disconnected again during the entire static current measurement process, making operation simple and convenient. The current amplification effect is generated by the test coil 14, and the static current is measured using a clamp meter 700, resulting in accurate and reliable measurements. To handle the large current in the vehicle's electrical system 500 when it is not in sleep mode, a protection circuit connected in parallel with the test circuit is used as a conduction-diverting circuit. This protects the test circuit and effectively copes with the sudden large current caused by the vehicle's electrical system waking up, preventing damage to electronic components due to excessive current.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automotive battery static current measuring device, characterized by, The switching circuit comprises a test circuit and a protection circuit arranged in parallel; the test circuit comprises a test switch module S1, a test resistor and a test coil arranged in series; the test coil comprises a multi-turn coil unit; the protection circuit is provided with a protection switch module; The test circuit is provided with a first sampling module for detecting and outputting basic electrical parameters of the test resistor; the parallel nodes at both ends of the switching circuit are respectively connected with a first interface and a second interface; the first interface is used for connecting a whole vehicle electrical appliance; and the second interface is used for connecting one electrode of a storage battery.

2. The automotive battery static flow measuring device according to claim 1, wherein The protection circuit comprises a short circuit arranged in parallel with the test circuit, and the short circuit comprises a short circuit switch module S3; and / or, The protection circuit comprises a transition circuit arranged in parallel with the test circuit, and the transition circuit comprises a transition switch module and a transition resistor arranged in series.

3. The automotive battery static flow measuring device of claim 2, wherein, The transition circuit comprises one, and the transition circuit comprises a transition switch module and a transition resistor arranged in series, and the resistance value of the transition resistor is smaller than that of the test resistor; or, The transition circuit comprises a plurality of parallel arrangements, each transition circuit comprises a transition switch module and a transition resistor arranged in series, the resistance value of each transition resistor is smaller than that of the test resistor, and the resistance value of each transition resistor decreases in turn.

4. The automotive battery static flow measuring device of claim 3, wherein, Each of the transition circuits is provided with a second sampling module corresponding to each transition resistor for detecting and outputting basic electrical parameters of the transition resistor.

5. The automotive battery static flow measuring device of claim 4, wherein, The test resistor and the first sampling module are arranged as a first sampling resistor, and each of the transition resistors and the corresponding second sampling module is arranged as a corresponding second sampling resistor.

6. The automotive battery static flow measuring device according to claim 4 or 5, characterized by The measuring device further comprises a controller, the test switch module S1 and the first sampling module are electrically connected with the controller; when the protection circuit comprises the transition circuit, the transition switch module is electrically connected with the controller; when the transition circuit comprises the second sampling module, the second sampling module is electrically connected with the controller.

7. The automotive battery static flow measuring device of claim 6, wherein, The controller comprises a plurality of microcontrollers corresponding to the test circuit and / or the transition circuit, the microcontrollers comprise a signal receiving module, a comparison module and a signal output module, the signal receiving module of each microcontroller is connected to the corresponding first sampling module and second sampling module, and the signal output module of each microcontroller is connected to the corresponding test switch module S1 and transition switch module.

8. The automotive battery static flow measuring device of claim 6, wherein, The controller comprises a power supply module, and the power supply module comprises a power supply interface for connecting a power supply to supply power to the controller.

9. The automotive battery static flow measuring device of claim 6, wherein, The measuring device comprises a box body, the switching circuit and the controller are arranged inside the box body, and the test coil is arranged outside the box body.

10. The automotive battery static flow measuring device of claim 7, wherein, The measuring device further comprises a display device, and the first sampling module and the second sampling module are electrically connected with the display device.

11. The automotive battery electrostatic flow measuring device according to claim 10, wherein The display device comprises a touch display screen, and the signal output module of each microcontroller is electrically connected with the touch display screen.

12. The automotive battery static flow measuring device of claim 1, wherein, The switching circuit further comprises a capacitor C arranged in parallel with the test circuit.

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