CN220490940U - Test circuit and system - Google Patents

Abstract

The utility model relates to a test circuit and a system, wherein the test circuit comprises a battery simulation module, a selection module and a first display module, the test circuit selects a plurality of adjustable voltage sources through the selection circuit to form a combined power supply, the combined power supply can simulate the normal voltage state of a battery and also simulate the abnormal voltage state of the battery, and the battery protection board receives the output voltage of the combined power supply and sends out corresponding indication signals, so that the test circuit can test whether the battery protection board can normally work in the normal voltage state and the abnormal voltage state of the battery.

Description

Test circuit and system

Technical Field

The present utility model relates to the field of battery protection, and in particular, to a test circuit and system.

Background

Lithium batteries are used in various fields, such as electric vehicles, due to their high capacity, light weight, and the like. Generally, a battery protection board is adopted to protect a lithium battery, and when the lithium battery is in an abnormal state such as overvoltage, overdischarge and the like, the battery protection board cuts off related circuits in time so as to protect the lithium battery and ensure the safety of the battery.

Before the battery protection board is put into use, the battery protection board needs to be tested to determine whether various functions of the battery protection board are normal. The current test scheme cannot fully test the functions of the battery protection board, and the electric quantity of the lithium battery is continuously changed in the test process, so that the test is inaccurate and the error is larger.

Disclosure of Invention

The embodiment of the utility model aims to provide a test circuit and a test system, which can more comprehensively and accurately test the functions of a battery protection board.

In order to solve the technical problems, the embodiment of the utility model provides the following technical scheme:

in a first aspect, embodiments of the present utility model provide a test circuit, the test circuit comprising: the device comprises a battery simulation module, a selection module and a first display module;

the battery simulation module comprises a plurality of adjustable voltage sources, the input end of each adjustable voltage source is connected with a first power supply, the selection module is respectively connected with each adjustable voltage source and the sampling end of the battery protection plate, the selection module is used for selecting the adjustable voltage sources so that the selected adjustable voltage sources are connected in series and output as a combined power supply, and the output end of the combined power supply is connected with the sampling end of the battery protection plate through the selection module;

The first indication end of the battery protection board is connected with the first display module, and the battery protection board is used for receiving the output voltage of the combined power supply and sending a first indication signal to the first display module according to the output voltage of the combined power supply so that the first display module emits light.

In some embodiments, the number of adjustable voltage sources is 3×4, wherein the output voltages of each row of adjustable voltage sources are the same and connected in series, the output voltages of each column of adjustable voltage sources are different and connected in parallel with the first power source.

In some embodiments, the selection module includes a first switching unit and a second switching unit;

the first end of the first switch unit is connected with the positive electrode of the adjustable voltage source of the first row, the second end of the first switch unit is connected with the positive electrode of the adjustable voltage source of the second row, the third end of the first switch unit is connected with the positive electrode of the adjustable voltage source of the third row, the middle end of the first switch unit is connected with the first sampling end of the battery protection plate, and the first switch unit is used for selecting the adjustable voltage source of the corresponding row;

The first end of the second switch unit is a normally open end, the second end of the second switch unit is connected with the positive electrode of the adjustable voltage source of the second row, the third end of the second switch unit is connected with the positive electrode of the adjustable voltage source of the first row, the fourth end of the second switch unit is connected with the positive electrode of the adjustable voltage source of the third row, and the second switch unit is used for selecting the adjustable voltage source of the corresponding row.

In some embodiments, the first switching unit includes a first switch, a second switch, a third switch, and a fourth switch;

the first end of the first switch is connected with the positive electrode of the 1×1-th adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×1-th adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×1-th adjustable voltage source, and the middle end of the first switch is connected with the first sampling end of the battery protection plate;

the first end of the second switch is connected with the positive electrode of the 1×2 adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×2 adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×2 adjustable voltage source, and the middle end of the second switch is connected with the second sampling end of the battery protection plate;

The first end of the third switch is connected with the positive electrode of the 1×3 adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×3 adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×3 adjustable voltage source, and the middle end of the third switch is connected with the third sampling end of the battery protection plate;

the first end of the fourth switch is connected with the positive electrode of the 1×4 adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×4 adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×4 adjustable voltage source, and the middle end of the fourth switch is connected with the fourth sampling end of the battery protection plate.

In some embodiments, the second switching unit includes a first ripple switch group, a second ripple switch group, a third ripple switch group, and a fourth ripple switch group;

the first normal open end of the first fluctuation switch group is connected with the positive electrode of the 1 x 1-th adjustable voltage source, the second normal open end of the first fluctuation switch group is connected with the positive electrode of the 3 x 1-th adjustable voltage source, the middle end of the first fluctuation switch group is connected with the positive electrode of the 2 x 1-th adjustable voltage source, and the first fluctuation switch group is used for selecting the 1 st row or the 3 rd row of adjustable voltage sources in the 1 st column;

The first normal open end of the second fluctuation switch group is connected with the positive electrode of the 1 x 2 adjustable voltage source, the second normal open end of the second fluctuation switch group is connected with the positive electrode of the 3 x 2 adjustable voltage source, the middle end of the second fluctuation switch group is connected with the positive electrode of the 2 x 2 adjustable voltage source, and the second fluctuation switch group is used for selecting the 1 st row or the 3 rd row adjustable voltage source in the 2 nd column;

the first normal open end of the third fluctuation switch group is connected with the positive electrode of the 1×3 adjustable voltage source, the second normal open end of the third fluctuation switch group is connected with the positive electrode of the 3×3 adjustable voltage source, the middle end of the third fluctuation switch group is connected with the positive electrode of the 2×3 adjustable voltage source, and the third fluctuation switch group is used for selecting the 1 st row or the 3 rd row adjustable voltage source in the 3 rd column;

the first normal open end of the fourth fluctuation switch group is connected with the positive electrode of the 1×4 adjustable voltage source, the second normal open end of the fourth fluctuation switch group is connected with the positive electrode of the 3×4 adjustable voltage source, the middle end of the fourth fluctuation switch group is connected with the positive electrode of the 2×4 adjustable voltage source, and the fourth fluctuation switch group is used for selecting the 1 st row or the 3 rd row adjustable voltage source in the 4 th column.

In some embodiments, the first display module includes a first LED lamp and a second LED lamp;

the positive pole of first LED lamp with the positive pole of second LED lamp respectively with battery protection board's first instruction end is connected, the negative pole of first LED lamp with the negative pole of second LED lamp is all grounded.

In some embodiments, the test circuit further comprises a load module and a first switch module;

the first end of the load module is connected with the positive electrode of the combined power supply, and the second end of the load module is connected with the negative electrode of the combined power supply;

the normal open end of the first switch module is connected with a first charging power supply, the middle end of the first switch module is connected with a first charging end of the battery protection plate, and a first charging output end of the battery protection plate is connected with the positive electrode of the combined power supply;

when the output voltage of the combined power supply is a first voltage, the first switch module is used for controlling the connection state of the first charging power supply and the first charging end so as to form a charging loop or a discharging loop, and the load module is a load of the charging loop or the discharging loop.

In some embodiments, the test circuit further comprises a second switch module;

The normal open end of the second switch module is connected with a second charging power supply, the middle end of the second switch module is connected with a second charging end of the battery protection plate, and a second charging output end of the battery protection plate is connected with the positive electrode of the combined power supply;

the second switch module is used for controlling the connection state of the second charging power supply and the second charging end.

In some embodiments, the test circuit further comprises a second display module;

the first end of the second display module is connected with the second indication end of the battery protection board, the second end of the second display module is grounded, and the second display module is used for receiving the second indication signal of the battery protection board and emitting light.

In a second aspect, embodiments of the present utility model provide a test system comprising a test circuit as described above and a battery protection board.

In various embodiments of the present utility model, the test circuit includes a battery simulation module, a selection module, and a first display module, wherein an adjustable voltage source in the battery simulation module is used to simulate the voltage of the battery, and the selection module can select the adjustable voltage source, so that the selected adjustable voltage sources are connected in series and output as a combined power source. The output end of the combined power supply is connected with the sampling end of the battery protection board through the selection module, the battery protection board receives the output voltage of the combined power supply and sends a first indication signal to the first display module according to the output voltage of the combined power supply so that the first display module emits light. Therefore, the test circuit selects a plurality of adjustable voltage sources to form the combined power supply through the selection circuit, the combined power supply can simulate the normal voltage state of the battery, the abnormal voltage state of the battery, such as an overvoltage state or an overdischarge state, the battery protection board receives the output voltage of the combined power supply and sends out corresponding indication signals, so that whether the battery protection board can normally work in the normal voltage state and the abnormal voltage state of the battery is tested, the combined power supply can simulate various states of the battery, the test is more comprehensive, meanwhile, compared with the real battery, the combined power supply can keep stable voltage in the test process and does not change electric quantity along with the test process, and the test circuit can more accurately test the function of the battery protection board.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 is a schematic diagram of one of the test systems according to the embodiments of the present utility model;

FIG. 2 is a schematic diagram of one of the test circuits according to the embodiment of the present utility model;

fig. 3 is a schematic circuit diagram of one of the test circuits according to the embodiment of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The home appliance can be any type of electric appliance with an infrared receiving function, especially electric appliances which are not required to be turned on in the sleeping process of a user, such as televisions, electric fans, air conditioners and the like. The specific type of home device may be set as desired.

Referring to fig. 1, an embodiment of the present utility model provides a schematic structure of a test system, and the test system 100 includes a test circuit 10 and a battery protection board 20.

In order to protect the safety and stability of the battery, a battery protection board 20 is generally configured for the battery, and when abnormal conditions such as overcharge and overdischarge occur in the battery, the battery protection board 20 can take measures such as cutting off a power supply loop in time to protect the battery.

Before the battery protection board 20 is formally put into use, it is necessary to test the battery protection board 20 to determine whether the function thereof is normal, for example, whether the battery protection board 20 can perform corresponding correct processing when an abnormal situation occurs in the battery.

The test circuit 10 is electrically connected to the battery protection board 20, and the test circuit 10 can simulate various working states of the battery, such as a battery overvoltage state, a battery overdischarge state, and a battery normal voltage state, so as to detect the function of the battery protection board 20.

Referring to fig. 2, fig. 2 is a schematic diagram showing a test circuit 10 applied to a battery protection board 20 according to an embodiment of the utility model, and as shown in fig. 2, the test circuit 1010 includes a battery simulation module 11, a selection module 12 and a first display module 13.

The battery simulation module 11 includes a plurality of adjustable voltage sources 111, an input end of each adjustable voltage source is connected with the first power source 200, the selection module 12 is respectively connected with each adjustable voltage source 111 and a sampling end of the battery protection board 20, and a first indication end of the battery protection board 20 is connected with the first display module 13.

The first power source 200 may be a mains supply, and a live wire and a neutral wire of the mains supply are connected to each adjustable voltage source respectively, so that the adjustable voltage source 111 can be adjusted to a required voltage. The utility power and the battery simulation module 11 may also be connected through a switch module, and when the switch module is in a conductive state, the utility power provides electric power for each adjustable voltage source of the battery simulation module 11.

The selection module 12 may select the adjustable voltage sources 111 such that the selected adjustable voltage sources 111 are connected in series and output as a combined power source. Because each adjustable voltage source can be adjusted to different voltages, the voltage of the combined power source can also be various voltages so as to simulate different states of the battery. For example: the selection module 12 selects a plurality of adjustable voltage sources 111 to be connected in series to form a combined power supply, and the output voltage of the combined power supply is the normal voltage of the battery to simulate the normal voltage state of the battery, or the selection module 12 selects a plurality of adjustable voltage sources 111 to be connected in series to form another combined power supply, and the output voltage of the other combined power supply exceeds the normal voltage of the battery to simulate the overvoltage state of the battery, or the selection module 12 selects a plurality of adjustable voltage sources 111 to be connected in series to form another combined power supply, and the output voltage of the other combined power supply is smaller than the normal voltage of the battery to simulate the overdischarge state of the battery.

In addition, the voltage of the adjustable voltage source 111 is a stable voltage, and the electric quantity is not changed along with charge and discharge, so as to reduce the test error caused by the electric quantity change in the test process.

The sampling end of the battery protection board 20 samples the output voltage of the combined power supply, and sends a first indication signal to the first display module 13 according to the output voltage of the combined power supply, so that the first display module 13 emits light.

The output voltage of the combined power source is different, and the first indication signal sent by the battery protection board 20 is different, for example: when the output voltage of the combined power supply simulates the over-voltage state of the battery, a first signal is sent out, so that the first display module 13 emits light and is in a normally-on state, and when the output voltage of the combined power supply simulates the over-voltage state of the battery, a second signal is sent out, so that the first display module 13 emits light and is in a flickering state.

According to the state displayed by the first display module 13, it can be determined whether the battery protection board 20 is in abnormal battery condition, and a corresponding indication signal is sent out, so as to test whether the function of the battery protection board 20 is normal. If the battery protection board 20 can send out the correct first indication signal, the corresponding function of the battery protection board 20 is normal.

In summary, the test circuit 10 selects the plurality of adjustable voltage sources 111 to form the combined power source through the selection circuit, and the combined power source can simulate the normal voltage state of the battery, and also simulate the abnormal voltage state of the battery, such as the overvoltage state or the overdischarge state, the battery protection board 20 receives the output voltage of the combined power source and sends out the corresponding indication signal, so as to test whether the battery protection board 20 can normally work in the normal voltage state and the abnormal voltage state of the battery, and the combined power source can simulate various states of the battery, so that the test is more comprehensive, and meanwhile, compared with the real battery, the combined power source can keep stable voltage in the test process and does not change the electric quantity along with the test process, therefore, the test circuit 10 can more accurately test the function of the battery protection board 20.

In some embodiments, referring to fig. 3, the plurality of adjustable voltage sources 111 are 3×4 adjustable voltage sources, wherein the output voltages of each row of adjustable voltage sources are the same and connected in series, and the output voltages of each column of adjustable voltage sources are different and connected in parallel.

The adjustable voltage sources 111 in the 1 st row are respectively a first adjustable voltage source DC1 to a fourth adjustable voltage source DC4, the adjustable voltage sources 111 in the 2 nd row are respectively a fifth adjustable voltage source DC5 to an eighth adjustable voltage source DC8, and the adjustable voltage sources 111 in the 3 rd row are respectively a ninth adjustable voltage source DC9 to a twelfth adjustable voltage source DC12.

The output voltage of each adjustable voltage source of the 1 st row is 4.3V, which exceeds the normal voltage of the battery by 3.8V, and is used for simulating the overvoltage state of the battery. The output voltage of each adjustable voltage source of the 2 nd row is 3.8V and is used for simulating the normal voltage state of the battery, and the output voltage of each adjustable voltage source of the 3 rd row is 2.65V and is used for simulating the over-discharge state of the battery. Thus, the output voltage of each column of the adjustable voltage source 111 is 4.3V, 3.8V, and 2.65V, respectively.

The selection module 12 includes a first switch unit 121 and a second switch unit 122. The first end of the first switch unit 121 is connected to the positive electrode of the adjustable voltage source 111 in the first row, the second end of the first switch unit 121 is connected to the positive electrode of the adjustable voltage source 111 in the second row, the third end of the first switch unit 121 is connected to the positive electrode of the adjustable voltage source 111 in the third row, and the middle end of the first switch unit 121 is connected to the sampling end of the battery protection board 20.

The first end of the second switch unit 122 is a normally open end, the second end of the second switch unit 122 is connected to the positive electrode of the adjustable voltage source 111 in the second row, the third end of the second switch unit 122 is connected to the positive electrode of the adjustable voltage source 111 in the first row, and the fourth end of the second switch unit 122 is connected to the positive electrode of the adjustable voltage source 111 in the third row.

The first switch unit 121 is used for selecting the adjustable voltage source 111 of the corresponding row, for example: when the first end of the first switch unit 121 is connected to the middle end thereof, the adjustable voltage source 111 of the first row is selected, and the positive electrode of the adjustable voltage source 111 of the first row is connected to the first sampling end of the battery protection board 20; when the second end of the first switch unit 121 is connected to the middle end thereof, the adjustable voltage source 111 of the second row is selected, and the positive electrode of the adjustable voltage source 111 of the second row is connected to the first sampling end of the battery protection board 20; when the third terminal of the first switch unit 121 is connected to the middle terminal thereof, the third row of the adjustable voltage sources 111 is selected, and the positive electrode of the third row of the adjustable voltage sources 111 is connected to the first sampling terminal of the battery protection plate 20.

The second switching unit 122 is used for selecting the adjustable voltage source 111 of the corresponding column, for example: when the first end of the second switch unit 122 is connected to the second end thereof, the first end is a normally open end, so that the response to the adjustable voltage source 111 is not selected; when the third terminal of the second switch unit 122 is connected to the second terminal thereof, the adjustable voltage source 111 of the first row or the third row in the corresponding column is selected.

As shown in fig. 3, the first switching unit 121 includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4.

The first end of the first switch S1 is connected to the positive electrode of the 1×1-th adjustable voltage source, the second end of the first switch S1 is connected to the positive electrode of the 2×1-th adjustable voltage source, the third end of the first switch S1 is connected to the positive electrode of the 3×1-th adjustable voltage source, and the middle end of the first switch S1 is connected to the first sampling end of the battery protection plate 20.

The first end of the second switch S2 is connected to the positive electrode of the 1×2-th adjustable voltage source, the second end of the first switch S1 is connected to the positive electrode of the 2×2-th adjustable voltage source, the third end of the first switch S1 is connected to the positive electrode of the 3×2-th adjustable voltage source, and the middle end of the second switch S2 is connected to the second sampling end of the battery protection plate 20.

The first end of the third switch S3 is connected to the positive electrode of the 1×3-th adjustable voltage source, the second end of the first switch S1 is connected to the positive electrode of the 2×3-th adjustable voltage source, the third end of the first switch S1 is connected to the positive electrode of the 3×3-th adjustable voltage source, and the middle end of the third switch S3 is connected to the third sampling end of the battery protection plate 20.

The first end of the fourth switch S4 is connected to the positive electrode of the 1×4-th adjustable voltage source, the second end of the first switch S1 is connected to the positive electrode of the 2×4-th adjustable voltage source, the third end of the first switch S1 is connected to the positive electrode of the 3×4-th adjustable voltage source, and the middle end of the fourth switch S4 is connected to the fourth sampling end of the battery protection plate 20.

The first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 are all three-in-one switches.

The second switching unit 122 includes a first ripple switch group 1221, a second ripple switch group 1222, a third ripple switch group 1223, and a fourth ripple switch group 1224.

The first constant end of the first ripple switch group 1221 is connected to the positive electrode of the 1×1 adjustable voltage source, the second constant end of the first ripple switch group 1221 is connected to the positive electrode of the 3×1 adjustable voltage source, the middle end of the first ripple switch group 1221 is connected to the positive electrode of the 2×1 adjustable voltage source, and the first ripple switch group 1221 is used for selecting the 1 st row or the 3 rd row of adjustable voltage sources in the 1 st column.

The first open end of the second ripple switch group 1222 is connected to the positive electrode of the 1×2 adjustable voltage source, the second open end of the second ripple switch group 1222 is connected to the positive electrode of the 3×2 adjustable voltage source, the middle end of the second ripple switch group 1222 is connected to the positive electrode of the 2×2 adjustable voltage source, and the second ripple switch group 1222 is used for selecting the 1 st row or the 3 rd row of adjustable voltage source in the 2 nd column.

The first open end of the third ripple switch group 1223 is connected to the positive electrode of the 1×3 adjustable voltage source, the second open end of the third ripple switch group 1223 is connected to the positive electrode of the 3×3 adjustable voltage source, the middle end of the third ripple switch group 1223 is connected to the positive electrode of the 2×3 adjustable voltage source, and the third ripple switch group 1223 is used for selecting the 1 st row or the 3 rd row of adjustable voltage sources in the 3 rd column.

The first constant end of the fourth ripple switch set 1224 is connected to the positive electrode of the 1×4 adjustable voltage source, the second constant end of the fourth ripple switch set 1224 is connected to the positive electrode of the 3×4 adjustable voltage source, the middle end of the fourth ripple switch set 1224 is connected to the positive electrode of the 2×4 adjustable voltage source, and the fourth ripple switch set 1224 is used for selecting the 1 st row or the 3 rd row of adjustable voltage source in the 4 th column.

While the first ripple switch set 1221 includes a tenth switch S10 and a fourteenth switch S14, the second ripple switch set 1222 includes an eleventh switch S11 and a fifteenth switch S15, the third ripple switch set 1223 includes a twelfth switch S12 and a sixteenth switch S16, and the fourth ripple switch set 1224 includes a thirteenth switch S13 and a seventeenth switch S17.

In some embodiments, the test circuit 10 further includes a load module 14 and a first switch module 15, where a first end of the load module 14 is connected to the positive pole of the combined power source, a second end of the load module 14 is connected to the negative pole of the combined power source, a normal end of the first switch module 15 is connected to a first charging power source, an intermediate end of the first switch module 15 is connected to a first charging end of the battery protection board 20, and a first charging output end of the battery protection board 20 is connected to the positive pole of the combined power source.

When the output voltage of the combined power supply is the first voltage, the first switch module 15 is configured to control the connection state of the first charging power supply and the first charging terminal, and if the first charging power supply and the first charging terminal are controlled to be in the connection state, the positive electrode of the first charging output terminal, the positive electrode of the combined power supply, the negative electrode of the combined power supply (the negative electrode of the first charging output terminal) form a charging loop, so as to charge the adjustable voltage source 111 in the combined power supply, so as to simulate the charging process of the battery.

In addition, since the output voltage of the combined power supply is the output voltage of the analog battery, which is a stable voltage, in this embodiment, the charging circuit needs to be provided with the load module 14 to consume the charging power, so that the charging circuit can work normally, and therefore, the load module 14 is connected in parallel with the combined power supply to provide a load for the charging circuit.

If the first charging power source and the first charging end are in the disconnected state, the combined power source and the load module 14 form a discharging loop, the load module 14 is used for consuming the electric quantity of the combined power source, and the positive electrode of the combined power source, the load module 14 and the negative electrode of the combined power source form the discharging loop.

In this embodiment, the first voltage is a normal voltage of the battery, which is 15.2V, and the first charging power source is a rated charging voltage of the battery, which is 5V.

As shown in fig. 3, the first switch module 15 includes a fifth switch S5, a normally open end of the fifth switch S5 is connected to the first charging power DC13, a middle end of the fifth switch S5 is connected to the first charging end of the battery protection board 20, and the first charging output end of the battery protection board 20 is connected to the positive electrode of the combined power (not shown in the drawing).

The load module 14 includes a first resistor R1 and a second resistor R2, where the first resistor R1 and the second resistor R2 are connected in parallel, the first common connection point is connected to the positive electrode of the combined power supply, and the second common connection point is grounded (i.e., the negative electrode of the combined power supply).

The load module 14 may be further connected to the positive electrode of the combined power supply through a sixth switch S6, where a normal end of the sixth switch S6 is connected to the first common connection point, and an intermediate end of the sixth switch S6 is connected to the positive electrode of the combined power supply, that is, a fourth sampling end of the battery protection board 20.

The ground terminal of the battery protection plate 20 may be connected to the ground through a seventh switch S7, the normal terminal of the seventh switch S7 is connected to the ground, and the intermediate terminal of the seventh switch S7 is connected to the ground terminal of the battery protection plate 20.

The ammeter VP1 may be connected in series in the charging loop or the discharging loop, the voltmeter VP2 may be connected in parallel to detect the charging or discharging current, and detect the charging voltage or discharging voltage, if the values of the voltmeter VP2 and the ammeter VP1 are both within the set range, the battery protection board 20 sends a first display signal to the first display module 13, so that the first display module 13 emits light in a preset manner, for example, in a normally-on state, so as to indicate that the charging function and the discharging function of the battery protection board 20 are normal, and if the display manner of the first display module 13 does not conform to the preset manner, so as to indicate that the charging function or the discharging function of the battery protection board 20 is abnormal, so as to detect the charging function and the discharging function of the battery protection board 20.

In some embodiments, to more intuitively observe the charging function and the discharging function, the test circuit 10 further includes a second display module 16, where a first end of the second display module 16 is connected to a second indication end of the battery protection board 20, and a second end of the second display module 16 is grounded.

When the combined power supply is charged, the battery protection board 20 sends out a first indication signal to the first display module 13, so that the first display module 13 receives the first indication signal and emits light. When the combined power supply is discharged, the battery protection board 20 sends a first indication signal to the first display module 13 and also sends a second indication signal to the second display module 16, so that the second display module 16 receives the second indication signal and emits light.

Through the first display module 13 and the second display module 16, the charging function and the discharging function of the battery protection board 20 can be observed more intuitively, if the battery protection board 20 is charged, the first display module 13 emits light according to a preset mode, if the battery protection board 20 is normally charged, the charging function is normal, and if the battery protection board 20 is discharged, the first display module 13 and the second display module 16 emit light according to a preset mode, if the two modules are normally charged, the discharging function is normal.

The second display module 16 may be controlled to be started by a physical key, and if the physical key is pressed, the second display module 16 is started, and the second display module 16 can normally receive the second indication signal.

As shown in fig. 3, the first display module 13 includes an LED1 and an LED2, the anode of the LED1 and the anode of the LED2 are respectively connected with the first indication end of the battery protection board 20, and the cathode of the LED1 and the cathode of the LED2 are grounded. The anode of the LED1 and the anode of the LED2 may be connected to the same port of the battery protection plate 20, for example: as shown in fig. 3, LED1 is connected to the CN2 port, and LED2 is also connected to the CN2 port.

The second display module 16 comprises LEDs 3, 4. The positive electrode of the LED3 and the positive electrode of the LED4 are respectively connected with the second indication end of the battery protection board 20, and the negative electrode of the LED3 and the negative electrode of the LED4 are grounded. The anode of the LED3 and the anode of the LED4 may be connected to different ports of the battery protection plate 20, for example: as shown in fig. 3, LED3 is connected to the P1 port and LED4 is connected to the CN4 port.

In some embodiments, the test circuit 10 further includes a second switch module 17, wherein a normal end of the second switch module 17 is connected to a second charging power source, an intermediate end of the second switch module 17 is connected to a second charging end of the battery protection board 20, and a second charging output end of the battery protection board 20 is connected to a positive electrode of the combined power source.

The second switch module 17 is configured to control a connection state of the second charging power source and the second charging terminal, and if the second charging power source and the second charging terminal are controlled to be in a connection state, the battery protection board 20 may receive a voltage of the second charging power source.

The voltage of the second charging power source exceeds a voltage preset threshold value, so that the overcharge function of the battery protection plate 20 is simulated when the battery is charged by using a charging voltage exceeding the rated voltage of the battery. If the battery protection board 20 stops charging the combined power supply to protect the battery, the overcharge function of the battery protection board 20 is indicated to be normal.

In this embodiment, the voltage of the second charging power source exceeds the rated charging voltage of the battery, which is greater than or equal to 9V.

As shown in fig. 3, the second switch module 17 includes an eighth switch S8, a normal-open end of the eighth switch S8 is connected to the second charging power source DC14, and a middle end of the eighth switch S8 is connected to the second charging end of the battery protection plate 20.

In some embodiments, the test circuit 10 further includes a temperature detection module, where the temperature detection module is connected to the temperature sampling end of the battery protection board 20, and is configured to detect the temperature of the battery protection board 20, and output a temperature signal, so that the battery protection board 20 sends a third indication signal to the first display module 13 according to the temperature signal.

If the temperature of the battery protection plate 20 is normal, the battery protection plate 20 instructs the first display module 13 to emit light in a preset manner through the third instruction signal, and if the temperature of the battery protection plate 20 is abnormal, the battery protection plate 20 instructs the first display module 13 to emit light in another preset manner through the third instruction signal.

By the display mode of the first display module 13, it is possible to determine whether the temperature protection function of the battery protection plate 20 is normal, thereby detecting the temperature protection function of the battery protection plate 20.

In some embodiments, the first power source 200 may be connected to the input terminal of each of the adjustable voltage sources through a ninth switch, the first intermediate terminal of the ninth switch is connected to the first input terminal of each of the adjustable voltage sources, and the second intermediate terminal of the ninth switch is connected to the second input terminal of each of the adjustable voltage sources. The first power supply 200 is 220V mains supply, when the ninth switch is turned on, the live wire of the mains supply is connected to the first input end of each adjustable voltage source, and the neutral wire of the mains supply is connected to the second input end of each adjustable voltage source.

The principle of operation of the test circuit 10 can be described as follows in connection with fig. 3:

and closing the ninth switch to enable the commercial power to be connected into each adjustable voltage source, 220V commercial power is connected from the CON1 end to the CON12 end of the 12 adjustable voltage sources 111, the output terminals are CON13 to CON24, and the output voltage is direct current voltage, wherein the voltage of the adjustable voltage source 111 in the 1 st row is 4.3V, the voltage of the adjustable voltage source 111 in the 2 nd row is 3.8V, and the voltage of the adjustable voltage source 111 in the 3 rd row is 2.65V. Each adjustable voltage source is used for simulating a battery, the rated voltage of the simulated battery is 3.8V, then 4.3V simulates the overcharge voltage of the battery, and 2.65V simulates the overdischarge voltage of the battery.

1. Testing the overvoltage function: all of the first to fourth switches S1 to S4 are turned on to 2 (i.e., the middle end is connected to the second end), the tenth to seventeenth switches S10 to S17 are turned off, i.e., are not turned on, and the seventh switch is turned on, so that the ground line is connected to the adjustable voltage source 111, and therefore, the four adjustable voltage sources 111 of the 2 nd row respectively obtain 3.8V voltages, and the total voltage of the series connection is 15.2V. Then, the first switch S1 is shifted to 1 (i.e., the middle end thereof is connected to the first end), the tenth switch S10 is shifted to 3 (i.e., the 2 pins and 3 pins of the tenth switch S10 are connected, the tenth switch S10 is in the on state), and the other switches are kept unchanged, so that the first adjustable voltage source DC1, the sixth adjustable voltage source 111, the seventh adjustable voltage source 111 and the eighth adjustable voltage source 111 are connected in series to form a combined power source, and the output voltage of the combined power source is 4.30v+3.80v+3.80v+3.80v+3.80v=15.70V, at this time, the voltage sampled by the first sampling end of the battery protection plate 20 is 4.3V, and the voltages sampled by the second sampling end to the fourth sampling end are 4.30v+3.80v=8.1v, 4.30v+3.80v+3.80v+3.80v+80v=15.70V, respectively. Therefore, the battery protection board 20 detects that the total voltage is 15.7V, exceeds the rated voltage by 15.2V, and the first adjustable voltage source DC1 is over-voltage (i.e. simulates the first battery over-voltage), which indicates that the battery is in an overcharged state, and stops charging, and sends a first indication signal to the LED2 to make it send out blue normally-on light.

If the LED2 is in a blue normally-on state, the overvoltage protection function of the battery protection board 20 is normal, and if the LED2 displays other abnormal states, the overvoltage protection function of the battery protection board 20 is abnormal, so that the overvoltage protection function of the battery protection board 20 is tested.

2. Testing the over-discharge function: the first switch S1 to the fourth switch S4 are all turned on to 2 stages to select the 2 nd row of adjustable voltage sources 111 to adjust, so that each adjustable voltage source in the 2 nd row obtains 3.8V voltage, then the first switch S1 is turned on to 3 stages, the tenth switch S10 is turned on to 3 stages, and the other switches remain unchanged, so that the ninth adjustable voltage source 111, the sixth adjustable voltage source 111, the seventh adjustable voltage source 111 and the eighth adjustable voltage source 111 are connected in series to form a combined power source, and the output voltage of the combined power source is 2.65v+3.80v+3.80v+3.80v=14.05V, at this time, the voltage sampled by the first sampling end of the battery protection plate 20 is 2.65V, and the voltages sampled by the second sampling end to the fourth sampling end are 2.65v+3.80v=6.65v, 2.65v+3.80v=10.25v, 2.80v+3.80v+3.80v+3.80v+14.05v. Therefore, the battery protection board 20 detects that the total voltage is 14.05V and less than 15.2V, and the first adjustable voltage source DC1 is overdischarged (i.e. simulates the overvoltage of the first battery), which indicates that the battery is in an overdischarge state, i.e. the battery is in an overdischarge state, and then overdischarge protection is performed on the ninth adjustable voltage source 111, and a first indication signal is sent to the LED2, so that blue blinking light is sent.

If the LED2 is in a blue blinking state, the over-discharge protection function of the battery protection board 20 is normal, and if the LED2 displays other abnormal states, the over-discharge protection function of the battery protection board 20 is abnormal, so that the over-discharge protection function of the battery protection board 20 is tested.

3. Testing normal voltage protection function: all of the first to fourth switches S1 to S4 are turned on to 2 (i.e., the middle end is connected to the second end), the tenth to seventeenth switches S10 to S17 are turned off, i.e., are not turned on, and the seventh switch is turned on, so that the ground line is connected to the adjustable voltage source 111, and therefore, the four adjustable voltage sources 111 of the 2 nd row respectively obtain 3.8V voltages, and the total voltage of the series connection is 15.2V. Therefore, the battery protection board 20 detects that the total voltage is 15.2V and is equal to the rated voltage of 15.2V, and indicates that the battery is in a normal voltage state, that is, the battery is in a normal voltage state, and then sends a first indication signal to the LED1 to send out red normally-on light.

If the LED1 is in a red normally-on state, the normal voltage protection function of the battery protection board 20 is indicated to be normal, and if the LED1 displays other abnormal states, the normal voltage protection function of the battery protection board 20 is indicated to be abnormal, so that the normal voltage protection function of the battery protection board 20 is tested.

4. And (3) testing a charging protection function: all the first to fourth switches S1 to S4 are turned on to 2 (i.e., the middle end is connected to the second end), the tenth to seventeenth switches S10 to S17 are turned off, i.e., are not turned on, and the seventh switch S7 is turned on, so that the ground line is connected to the adjustable voltage source 111, and therefore, the four adjustable voltage sources 111 of the 2 nd row respectively obtain 3.8V voltages, and the output voltage of the combined power supply formed by connecting the four adjustable voltage sources in series is 15.2V. On the basis, the seventh switch S7 is closed, so that the grounding end of the battery protection board 20 is grounded, and the sixth switch S6 is opened to 3 stages, so that the positive electrode of the combined power supply, the first resistor R1 and the second resistor R2 which are connected in parallel and the ground (namely the negative electrode or the grounding end of the combined power supply) form a discharge loop;

the fifth switch S5 is switched to 3 stages to be closed, the first charging power supply DC13 is connected to the interface CN1 of the battery protection plate 20, after the first charging power supply DC13 is boosted by the booster circuit in the battery protection plate 20, the first charging power supply DC13 is connected with the positive electrode of the combined power supply through the first charging output end, so that the first charging output end, the positive electrode of the combined power supply, the first resistor R1 and the second resistor R2 which are connected in parallel form a charging loop to charge the combined power supply;

In the charging process, the voltmeter VP2 is adopted to measure the charging voltage, the ammeter VP1 is adopted to measure the charging current, and if the charging voltage and the charging current are both within a preset range, the battery protection board 20 sends a first indication signal to both the LED1 and the LED2, so that the two lamps are in a normally-on state;

if both lamps are in a normally-on state, the charge protection function of the battery protection board 20 is normal, and if both lamps display other abnormal states, the charge protection function of the battery protection board 20 is abnormal, so that the charge protection function of the battery protection board 20 is tested.

5. Testing the discharge protection function: on the basis of testing the charge protection function, when discharging is needed, the fifth switch S5 is switched to 2 gear, so that the fifth switch S is disconnected to disconnect the access of the first charging power supply DC13, and at the moment, only a discharge loop is left;

in the discharging process, the voltmeter VP2 is adopted to measure the discharging voltage, the ammeter VP1 is adopted to measure the discharging current, and if the voltmeter VP1 and the voltmeter are both in a preset range, the battery protection board 20 sends a first indication signal to the LED1 and the LED2, so that the two lamps are in a normally-on state, and sends a second indication signal to the LED3 and the LED4, so that the two lamps are in a normally-on state;

if the four lamps are in a normally-on state, the discharge protection function of the battery protection plate 20 is normal, and if the four lamps display other abnormal states, the discharge protection function of the battery protection plate 20 is abnormal, so that the discharge protection function of the battery protection plate 20 is tested.

6. Testing the overvoltage protection function of the charging voltage: on the basis of testing the discharge protection function, the eighth switch S8 is switched on to the 3 rd gear, so that the eighth switch S8 is closed, the second charging power supply DC14 is connected, the voltage of the second charging power supply DC14 exceeds the rated charging voltage, the battery protection board 20 stops charging the combined power supply, and a first indication signal is sent to the LEDs 1 and 2, so that the LEDs are in a flickering state;

if the two lamps are in a blinking state, the charge voltage overvoltage protection function of the battery protection board 20 is normal, and if the two lamps display other abnormal states, the charge voltage overvoltage protection function of the battery protection board 20 is abnormal, so that the charge voltage overvoltage protection function of the battery protection board 20 is tested.

7. Testing temperature protection function: in the charge and discharge state, the temperature of the battery protection board 20 is measured by the temperature sensor, when the temperature does not exceed a preset temperature threshold, a first indication signal is sent to the LED1 to enable the battery protection board to emit light in a breathing lamp mode, and when the temperature exceeds the preset temperature threshold, a first indication signal is sent to both the LED1 and the LED2 to enable both the lamps to emit light in the breathing lamp mode;

if both lamps conform to the above state, the temperature protection function of the battery protection plate 20 is indicated to be normal, and if both lamps display other abnormal states, the temperature protection function of the battery protection plate 20 is indicated to be abnormal, so that the temperature protection function of the battery protection plate 20 is tested.

In summary, the test circuit 10 selects a plurality of adjustable voltage sources 111 through the selection circuit to form a combined power source, the combined power source can simulate various states of the battery, the test is more comprehensive, meanwhile, compared with the real battery, the combined power source can keep stable voltage in the test process and can not change electric quantity along with the test process, so that the test circuit 10 can test the functions of the battery protection board 20 more accurately.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the utility model, the steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A test circuit for use with a battery protection plate, the test circuit comprising: the device comprises a battery simulation module, a selection module and a first display module;

the battery simulation module comprises a plurality of adjustable voltage sources, the input end of each adjustable voltage source is connected with a first power supply, the selection module is respectively connected with each adjustable voltage source and the sampling end of the battery protection plate, the selection module is used for selecting the adjustable voltage sources so that the selected adjustable voltage sources are connected in series and output as a combined power supply, and the output end of the combined power supply is connected with the sampling end of the battery protection plate through the selection module;

the first indication end of the battery protection board is connected with the first display module, and the battery protection board is used for receiving the output voltage of the combined power supply and sending a first indication signal to the first display module according to the output voltage of the combined power supply so that the first display module emits light.

2. The test circuit of claim 1, wherein the number of adjustable voltage sources is 3 x 4, wherein the output voltages of each row of adjustable voltage sources are the same and are connected in series, and wherein the output voltages of each column of adjustable voltage sources are different and are connected in parallel with the first power source.

3. The test circuit of claim 2, wherein the selection module comprises a first switching unit and a second switching unit;

the first end of the first switch unit is connected with the positive electrode of the adjustable voltage source of the first row, the second end of the first switch unit is connected with the positive electrode of the adjustable voltage source of the second row, the third end of the first switch unit is connected with the positive electrode of the adjustable voltage source of the third row, the middle end of the first switch unit is connected with the first sampling end of the battery protection plate, and the first switch unit is used for selecting the adjustable voltage source of the corresponding row;

the first end of the second switch unit is a normally open end, the second end of the second switch unit is connected with the positive electrode of the adjustable voltage source of the second row, the third end of the second switch unit is connected with the positive electrode of the adjustable voltage source of the first row, the fourth end of the second switch unit is connected with the positive electrode of the adjustable voltage source of the third row, and the second switch unit is used for selecting the adjustable voltage source of the corresponding row.

4. A test circuit according to claim 3, wherein the first switching unit comprises a first switch, a second switch, a third switch and a fourth switch;

The first end of the first switch is connected with the positive electrode of the 1×1-th adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×1-th adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×1-th adjustable voltage source, and the middle end of the first switch is connected with the first sampling end of the battery protection plate;

the first end of the second switch is connected with the positive electrode of the 1×2 adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×2 adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×2 adjustable voltage source, and the middle end of the second switch is connected with the second sampling end of the battery protection plate;

the first end of the third switch is connected with the positive electrode of the 1×3 adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×3 adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×3 adjustable voltage source, and the middle end of the third switch is connected with the third sampling end of the battery protection plate;

the first end of the fourth switch is connected with the positive electrode of the 1×4 adjustable voltage source, the second end of the first switch is connected with the positive electrode of the 2×4 adjustable voltage source, the third end of the first switch is connected with the positive electrode of the 3×4 adjustable voltage source, and the middle end of the fourth switch is connected with the fourth sampling end of the battery protection plate.

5. A test circuit according to claim 3, wherein the second switching unit comprises a first set of ripple switches, a second set of ripple switches, a third set of ripple switches, and a fourth set of ripple switches;

the first normal open end of the first fluctuation switch group is connected with the positive electrode of the 1 x 1-th adjustable voltage source, the second normal open end of the first fluctuation switch group is connected with the positive electrode of the 3 x 1-th adjustable voltage source, the middle end of the first fluctuation switch group is connected with the positive electrode of the 2 x 1-th adjustable voltage source, and the first fluctuation switch group is used for selecting the 1 st row or the 3 rd row of adjustable voltage sources in the 1 st column;

the first normal open end of the second fluctuation switch group is connected with the positive electrode of the 1 x 2 adjustable voltage source, the second normal open end of the second fluctuation switch group is connected with the positive electrode of the 3 x 2 adjustable voltage source, the middle end of the second fluctuation switch group is connected with the positive electrode of the 2 x 2 adjustable voltage source, and the second fluctuation switch group is used for selecting the 1 st row or the 3 rd row adjustable voltage source in the 2 nd column;

the first normal open end of the third fluctuation switch group is connected with the positive electrode of the 1×3 adjustable voltage source, the second normal open end of the third fluctuation switch group is connected with the positive electrode of the 3×3 adjustable voltage source, the middle end of the third fluctuation switch group is connected with the positive electrode of the 2×3 adjustable voltage source, and the third fluctuation switch group is used for selecting the 1 st row or the 3 rd row adjustable voltage source in the 3 rd column;

The first normal open end of the fourth fluctuation switch group is connected with the positive electrode of the 1×4 adjustable voltage source, the second normal open end of the fourth fluctuation switch group is connected with the positive electrode of the 3×4 adjustable voltage source, the middle end of the fourth fluctuation switch group is connected with the positive electrode of the 2×4 adjustable voltage source, and the fourth fluctuation switch group is used for selecting the 1 st row or the 3 rd row adjustable voltage source in the 4 th column.

6. The test circuit of claim 1, wherein the first display module comprises a first LED lamp and a second LED lamp;

the positive pole of first LED lamp with the positive pole of second LED lamp respectively with battery protection board's first instruction end is connected, the negative pole of first LED lamp with the negative pole of second LED lamp is all grounded.

7. The test circuit of claim 1, further comprising a load module and a first switch module;

the first end of the load module is connected with the positive electrode of the combined power supply, and the second end of the load module is connected with the negative electrode of the combined power supply;

the normal open end of the first switch module is connected with a first charging power supply, the middle end of the first switch module is connected with a first charging end of the battery protection plate, and a first charging output end of the battery protection plate is connected with the positive electrode of the combined power supply;

When the output voltage of the combined power supply is a first voltage, the first switch module is used for controlling the connection state of the first charging power supply and the first charging end so as to form a charging loop or a discharging loop, and the load module is a load of the charging loop or the discharging loop.

8. The test circuit of claim 7, further comprising a second switch module;

the normal open end of the second switch module is connected with a second charging power supply, the middle end of the second switch module is connected with a second charging end of the battery protection plate, and a second charging output end of the battery protection plate is connected with the positive electrode of the combined power supply;

the second switch module is used for controlling the connection state of the second charging power supply and the second charging end.

9. The test circuit of claim 7 or 8, further comprising a second display module;

the first end of the second display module is connected with the second indication end of the battery protection board, the second end of the second display module is grounded, and the second display module is used for receiving the second indication signal of the battery protection board and emitting light.

10. A test system comprising a test circuit according to any one of claims 1-9 and a battery protection plate.