Lithium battery charger testing device

Abstract

The utility model discloses a lithium battery charger testing device which comprises a bottom plate, supporting legs, an adjustable resistor, an anti-reverse-connection diode, a first switch, a second switch, a diode lamp, an ampere meter, a diverter, a cooling fan, a fuse, a knob potentiometer and an operation panel. The function definition of the charger under each voltage value is tested by adjusting the voltage value of the power supply; the NTC resistance change is simulated through the knob potentiometer, and the function definition of the charger at each temperature is tested; whether the output terminal of the charger is correctly connected or not is tested according to whether the diode lamp is turned on or not. The beneficial effects are that operation is simple, usage is convenient, and a function of comprehensive testing of the lithium battery charger is realized through cooperation with the voltage-adjustable DC power supply.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy equipment testing, in particular to a lithium battery charger testing device. Background Art

[0002] The following problems exist when testing existing lithium battery chargers:

[0003] 1. Use the battery pack to test directly. If the charger output port is connected incorrectly, it is easy to damage the battery or charger.

[0004] 2. When testing with a battery pack, some functions cannot be tested, such as the charge undervoltage protection, because the discharge protection voltage of the battery pack is higher than the charge undervoltage protection voltage, so the charge undervoltage test cannot be performed with the battery pack. There are also functions such as the automatic recovery charge function after the charge undervoltage protection, the automatic recovery charge function after the overvoltage protection, and the trickle charge function;

[0005] 3. For temperature testing, a battery pack is used for testing. Since the battery cells heat up and cool down slowly, the test time is too long. In addition, since the NTC is buried on the surface of the battery cells, it is inconvenient to measure the resistance value. Summary of the Invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide a lithium battery charger testing device, which has the advantages of simple operation and easy use. In combination with an adjustable voltage DC power supply, it can comprehensively and quickly test the functions of the lithium battery charger.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0008] A lithium battery charger testing device includes a base plate, supporting feet, an adjustable resistor, an anti-reverse polarity diode, a switch 1, a switch 2, an ammeter, a shunt, a diode lamp, a cooling fan, a fuse, a knob potentiometer, and an operating panel, characterized in that: the supporting feet are mounted on the lower part of the base plate, the anti-reverse polarity diode, switch 1, ammeter, fuse, and knob potentiometer are mounted on the operating panel, the adjustable resistor, operating panel, and cooling fan are mounted on the base plate, and the cooling fan is provided with a bracket; the adjustable resistor, anti-reverse polarity diode, switch 1, and fuse are connected in series, and the two ends of the series circuit are connected to the positive and negative electrodes of an adjustable voltage DC power supply; the ammeter is connected in parallel with the shunt, and the shunt is connected in series with the non-common end of one gear of the adjustable resistor and the switch 2; the positive electrode of the diode lamp is connected to the non-common end of another gear of the switch 2; the common end of the two gears of the switch 2 is connected to the positive electrode of the battery pack under test; the negative electrode of the shunt is connected to the negative electrode of the diode lamp after it meets the negative electrode of the diode lamp, and then connected to the negative electrode of the charger under test.

[0009] Preferably, the second switch is a two-speed switch, and the positive electrode of the diode lamp and the adjustable resistor are respectively connected to two non-common poles of the second switch.

[0010] Preferably, the cooling fan is a quad-chassis cooling fan.

[0011] Preferably, the knob potentiometer is directly connected to the NTC resistor connection terminal of the charger under test.

[0012] The beneficial effects are: the utility model is simple to operate and easy to use, and can realize the function of comprehensive testing of lithium battery chargers in conjunction with an adjustable voltage DC power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a circuit principle diagram of the utility model;

[0014] Figure 2 It is a structural diagram of the utility model;

[0015] Explanation of the serial numbers in the attached figure: 1. Diode lamp; 2. Switch 2; 3. Switch 1; 4. Operation panel; 5. Shunt; 6. Support foot; 7. Anti-reverse polarity diode; 8. Bottom plate; 9. Cooling fan; 10. Adjustable resistor; 11. Ammeter; 12. Fuse; 13. Knob potentiometer; 14. Adjustable DC power supply; 15. Lithium battery charger test device; 16. Lithium battery charger. DETAILED DESCRIPTION

[0016] It should be noted that the directional nouns that may be involved in the following paragraphs, including but not limited to "up, down, left, right, front, back, inside, outside", etc., are based on the view orientations shown in the corresponding drawings of the specification. Their purpose is only to facilitate those skilled in the art to better understand the technical solution of the utility model, and they should not be regarded as limiting the scope of protection or technical solution of the utility model.

[0017] It should also be noted that, unless otherwise specified or limited, the terms "install," "assemble," "connect," and "connect" should be understood broadly. For example, they can refer to fixed or removable connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figures 1 and 2As shown, a lithium battery charger test device includes a base plate 8, a support leg 6, an adjustable resistor 10, an anti-reverse polarity diode 7, a switch 3, a switch 2, an ammeter 11, a shunt 5, a diode lamp 1, a cooling fan 9, a fuse 12, a knob potentiometer 13, and an operation panel 4, characterized in that: the support leg 6 is mounted on the lower part of the base plate 8, the anti-reverse polarity diode 7, the switch 3, the ammeter 11, the fuse 12, and the knob potentiometer 13 are mounted on the operation panel 4, the adjustable resistor 10, the operation panel 4, the cooling fan 9 Mounted on base plate 8; the adjustable resistor 10, anti-reverse polarity diode 7, switch 1 3, and fuse 12 are connected in series, with the positive and negative terminals of the adjustable DC power supply connected at both ends. The ammeter 11 is connected in parallel with the shunt 5. The shunt 5 is connected in series with the adjustable resistor 10 and the non-common terminal of switch 2 2 in one gear. The positive terminal of diode lamp 1 is connected to the non-common terminal of the other gear of switch 2 2. The common terminal of switch 2 2 in both gears is connected to the positive terminal of the battery pack under test. The negative terminal of shunt 5, after meeting the negative terminal of diode lamp 1, is connected to the negative terminal of the charger under test. Switch 2 2 is a two-speed switch. The positive terminal of diode lamp 1 and the adjustable resistor 10 are connected to the two non-common terminals of switch 2 2, respectively. The cooling fan 9 is a four-unit chassis cooling fan. The knob potentiometer 13 is directly connected to the NTC resistor connection terminal of the charger under test.

[0020] The specific working process, taking a 60V charger as an example, its function settings are shown in Table 1:

[0021] Table 1

[0022] Functional Description Parameter value Undervoltage charging protection 30V Automatically restore charging voltage after undervoltage 34.5V Overvoltage charging protection 63V Automatically restore charging voltage after overvoltage 61.5V Charging high temperature protection value 50℃ (corresponding resistance value 4.16kΩ) Automatically restore charging temperature after charging high temperature protection 44°C (corresponding resistance value 5.09kΩ) Charging low temperature protection value 0℃ (corresponding resistance value 26.729kΩ) Automatically restore charging temperature after charging low temperature protection 5°C (corresponding resistance value 21.761kΩ) Trickle charge voltage / current 30V~37.5V / 250mA Constant current charging voltage / current 37.5V-~61.5V / 2A Constant voltage charging voltage / current limit 61.5V / >150mA

[0023] First Example: Switch 2 is set to position 0. At this point, the diode light 1 circuit is connected. When the lithium battery charger 16 is connected to AC input, its T and C- terminals output 5V. After the +, C-, and T terminals are properly connected, T and C- discharge through the knob potentiometer 13. The charger then recognizes that a battery is connected. Then, the + and C- terminals release a 62V charging voltage, and the diode light illuminates. If the +, C-, and T terminals in the lithium battery charger 16 are incorrectly wired, the diode light 1 will not illuminate. This tests whether the output terminal wiring of the lithium battery charger 16 is correct.

[0024] Second embodiment: Switch 1 3 and switch 2 2 are set to position 0, the adjustable DC power supply 14 is turned on, and the voltage is adjusted to 31V. After the lithium battery charger 16 is tested and confirmed to have the output terminal wiring correct, the AC power is reconnected. Switch 1 3 and switch 2 2 are set to position 1. At this time, the adjustable DC power supply 14-lithium battery charger test device 15 circuit and the lithium battery charger 16-lithium battery charger test device 15 circuit are both connected. The ammeter 11 displays the charging voltage and current. By adjusting the voltage value of the adjustable DC power supply 14, the charger operation is tested to see whether it meets the parameter requirements of the functional definition. For example, if the voltage is adjusted to less than 30V, the lithium battery charger 16 should stop charging and flash the corresponding warning light. After undervoltage protection, the voltage of the adjustable DC power supply 14 is increased to 34.5V to test whether the lithium battery charger 16 automatically resumes charging and the charging current is in trickle charging mode. The voltage is adjusted between 30V and 37.5V, and the current value is read using an ammeter to determine whether the charger is functioning properly. Similarly, by adjusting the DC power supply voltage value, functions such as voltage protection, protection release, and charging voltage and current can be tested. During this time, the cooling fan 9 is turned on to dissipate heat from the adjustable resistor 10.

[0025] Third Example: Switch 1 (3) and Switch 2 (2) are set to position 0, the adjustable DC power supply (14) is turned on, and the voltage is adjusted to 54V. After testing and confirming that the output terminals of the lithium battery charger (16) are correctly wired, the AC power supply is reconnected. Switch 1 (3) and Switch 2 (2) are set to position 1. The circuits from the adjustable DC power supply (14) to the lithium battery charger test device (15) and the circuits from the lithium battery charger (16) to the lithium battery charger test device (15) are both connected, and the lithium battery charger (16) is in a constant current charging state. The resistance value of the potentiometer (13) is adjusted to the various characteristic values specified in Table 1 to test the lithium battery charger (16) for proper temperature protection and automatic charging resumption after temperature protection is released. During this time, the cooling fan (9) is turned on to dissipate heat from the adjustable resistor (10).

[0026] Although the above describes in detail the structure and method for implementing the present invention, the present invention is not limited thereto. Without departing from the technical concept and purpose of the present invention, technicians in this field can modify the described implementation method in terms of shape, size, and other detailed structures, and the modifications made are still included in the present invention.

Claims

1. A lithium battery charger test device, comprising a base plate, support legs, an adjustable resistor, an anti-reverse polarity diode, a first switch, a second switch, a diode lamp, an ammeter, a shunt, a cooling fan, a fuse, a knob potentiometer, and an operation panel, characterized in that: Support feet are installed at the lower part of the base plate, the anti-reverse polarity diode, diode lamp, switch 1, switch 2, ammeter, fuse, and knob potentiometer are installed on the operation panel, the adjustable resistor, operation panel, and cooling fan are installed on the base plate, the adjustable resistor, anti-reverse polarity diode, switch 1, and fuse are connected in series, and the two ends of the series circuit are connected to the positive and negative electrodes of the adjustable voltage DC power supply, the ammeter is connected in parallel with the shunt, and the shunt is connected in series with the adjustable resistor and a group of switch 2 positions, the positive electrode of the diode lamp is connected in series with another group of switch 2 positions, the common pole of the two pins of switch 2 is connected to the positive pole of the charger under test, and the negative pole of the diode lamp is connected to the negative pole of the charger under test after it is combined with the negative pole of the adjustable resistor and the negative pole of the shunt.

2. The lithium battery charger testing device according to claim 1, characterized in that: The switch 2 is a two-speed switch, and the positive electrode of the diode lamp and the adjustable resistor are respectively connected to two non-common electrodes of the switch 2.

3. The lithium battery charger testing device according to claim 1, characterized in that: The cooling fan is a quad-chassis cooling fan.

4. The lithium battery charger testing device according to claim 1, characterized in that: The knob potentiometer is directly connected to the NTC resistor connection terminal of the charger under test.

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