[0026] The embodiments of the present invention will now be described with reference to the accompanying drawings, in which similar element numbers represent similar elements.
[0027] Reference figure 1 The test system for a battery protection board of the present invention includes an electronic load 20 and a test device 10, and the electronic load 20, the test device 10 and the battery protection board 200 are connected to form a test circuit.
[0028] Combine figure 1 , figure 2 with image 3 The test device 10 includes a power supply module 101, a voltage adjustment module 102, a test control module 103, a battery 104, a voltage display module 105 and a reset switch 106.
[0029] Specifically, the battery 104 includes battery cells B1 (B2, B3, and B4), and the battery cells B1 (B2, B3, and B4) are connected in series.
[0030] Specifically, the power module 101 includes a transformer T1, a bridge rectifier D1, and a capacitor C1. The input end of the transformer T1 is connected to mains power (AC220V), the output end of the transformer T1 is connected to the input end of the bridge rectifier D1, and the capacitor C1 is a polar capacitor and is connected to the output of the bridge rectifier D1 Terminal, wherein the output voltage of the transformer T1 is AC12V.
[0031] Specifically, the voltage adjustment module 102 includes a first voltage adjustment unit 1021, a second voltage adjustment unit 1022, and a voltage conversion unit 1023;
[0032] The first voltage regulation unit 1021 includes a regulator Q2 (LM317, adjustable 3-terminal positive voltage regulator), a capacitor C3 (C4 and C5), a resistor R1, an adjustable resistor RV1, and a diode D2. The capacitor C3 is A polar capacitor and its positive pole is connected to the positive pole of the output terminal of the bridge rectifier D1, and the negative pole of the capacitor C3 is grounded; the V of the voltage regulator Q2 in The pin is connected to the positive pole of the output end of the bridge rectifier D1, the Adj pin of the regulator Q2 is connected to one end of the capacitor C4, the other end of the capacitor C4 is grounded, and one end of the resistor R1 is connected to the V of voltage regulator Q2 out Pin, the other end of the resistor R1 is simultaneously connected to the Adj pin of the regulator Q2, one end of the adjustable resistor RV1 and the anode of the diode D2, and the other end of the adjustable resistor RV1 is grounded, The cathode of the diode D2 is connected to the V of the regulator Q2 out Pin; the capacitor C5 is a polar capacitor and its positive pole is connected to the voltage regulator Q2 V out Pin, the negative pole of the capacitor C5 is grounded;
[0033] The second voltage regulation unit 1022 includes a regulator Q3 (LM317, adjustable 3-terminal positive voltage regulator), a capacitor C6 (C7 and C8), a resistor R2, an adjustable resistor RV2, and a diode D3. The capacitor C8 is A polar capacitor and its positive pole is connected to the positive pole of the output terminal of the bridge rectifier D1, and the negative pole of the capacitor C8 is grounded; the V of the voltage regulator Q3 in The pin is connected to the positive pole of the output end of the bridge rectifier D1, the Adj pin of the regulator Q3 is connected to one end of the capacitor C7, the other end of the capacitor C7 is grounded, and one end of the resistor R2 is connected to the V of voltage regulator Q3 out Pin, the other end of the resistor R2 is simultaneously connected to the Adj pin of the regulator Q3, one end of the adjustable resistor RV2 and the anode of the diode D3, and the other end of the adjustable resistor RV2 is grounded, The cathode of the diode D3 is connected to the V of the regulator Q3 out Pin; the capacitor C6 is a polar capacitor and its positive pole is connected to the voltage regulator Q3 V out Pin, the negative pole of the capacitor C6 is grounded;
[0034] The voltage conversion unit 1023 includes a relay KA1 (8 pins, coil voltage AC12V) and a switch K1. Specifically, the switch K1 is a normally closed switch. A normally open pin of the relay KA1 is connected to the V of the voltage regulator Q2 out Pin, the other normally open pin is connected to ground; a normally closed pin of the relay KA1 is connected to the V of the voltage regulator Q3 out Pin, the other normally closed pin is connected to ground; a coil pin of the relay KA1 is connected to the normally closed contact of the switch K1, the other coil pin of the relay KA1 is grounded, and the common of the switch K1 The contact is connected to the anode of the output terminal of the bridge rectifier D1, and the normally open contact of the switch K1 is free.
[0035] The voltage display module 105 includes a voltage display unit, a unidirectional thyristor Q1 and a capacitor C2. The capacitor C2 is a polar capacitor. The cathode K of the unidirectional thyristor Q1 is connected to the output of the bridge rectifier D1. The anode A of the unidirectional thyristor Q1 is grounded, the control electrode G of the unidirectional thyristor Q1 is connected to the anode of the capacitor C2, the cathode of the capacitor is grounded, and the voltage display unit is driven The positive pole of the terminal is connected to the control pole G of the one-way thyristor Q1, the negative pole of the driving terminal of the voltage display unit is grounded, and the detection terminal of the voltage display unit is connected to the common pin of the relay KA1.
[0036] The test control module 103 includes a relay KA11 (KA12, KA13, and KA14) and a switch K11 (K12, K13, and K14).
[0037] Specifically, one normally closed pin of the relay KA11 is connected to the positive electrode of the battery cell B1, and the other normally closed pin is connected to the negative electrode of the battery cell B1, and a normally open pin of the relay KA11 is connected to one of the relay KA1. The common pin and the other normally open pin are connected to the other common pin of the relay KA1, a coil pin of the relay KA11 is connected to the normally closed contact of the switch K11, and the other coil of the relay KA11 The pin is grounded, the common pin of the relay KA11 is connected to the signal line interface of the battery protection board 200, the common contact of the switch K11 is connected to the positive pole of the output terminal of the bridge rectifier D1, and the normal of the switch K11 Open contacts are free;
[0038] Specifically, a normally closed pin of the relay KA12 is connected to the positive electrode of the battery cell B2, and the other normally closed pin is connected to the negative electrode of the battery cell B2, and a normally open pin of the relay KA12 is connected to one of the relay KA1. The common pin and the other normally open pin are connected to the other common pin of the relay KA1, a coil pin of the relay KA12 is connected to the normally closed contact of the switch K12, and the other coil of the relay KA12 The pin is grounded, the common pin of the relay KA12 is connected to the signal line interface of the battery protection board 200, the common contact of the switch K12 is connected to the positive pole of the output terminal of the bridge rectifier D1, and the normal of the switch K12 Open contacts are free;
[0039] Specifically, one normally closed pin of the relay KA13 is connected to the positive electrode of the battery cell B3, and the other normally closed pin is connected to the negative electrode of the battery cell B3, and a normally open pin of the relay KA13 is connected to one of the relay KA1. The common pin and the other normally open pin are connected to the other common pin of the relay KA1, a coil pin of the relay KA13 is connected to the normally closed contact of the switch K13, and the other coil of the relay KA13 The pin is grounded, the common pin of the relay KA13 is connected to the signal line interface of the battery protection board 200, the common contact of the switch K13 is connected to the positive pole of the output terminal of the bridge rectifier D1, and the normal of the switch K13 Open contacts are free;
[0040] Specifically, a normally closed pin of the relay KA14 is connected to the positive electrode of the battery cell B4, and the other normally closed pin is connected to the negative electrode of the battery cell B4, and a normally open pin of the relay KA14 is connected to one of the relay KA1. The common pin and the other normally open pin are connected to the other common pin of the relay KA1, a coil pin of the relay KA14 is connected to the normally closed contact of the switch K14, and the other coil of the relay KA14 The pin is grounded, the common pin of the relay KA14 is connected to the signal line interface of the battery protection board 200, the common contact of the switch K14 is connected to the positive pole of the output terminal of the bridge rectifier D1, and the normal of the switch K14 The open contact is free.
[0041] The normally closed contact of the reset switch 106 is connected to the positive interface P+ of the electronic load 20, and the common contact of the reset switch 106 is connected to the positive pole of the battery cells B1 (B2, B3, and B4) in series. The normally open contact of the switch 106 is empty, the negative electrode of the battery cell B1 (B2, B3, and B4) connected in series is connected to the battery interface B- of the battery protection board 200, and the negative interface P- of the electronic load 20 Connect to the discharge interface P′ of the battery protection board 200 to test the over-discharge protection function of the battery protection board 200. It is worth noting that when testing the overcharge protection function of the battery protection board 200, the negative interface P- of the electronic load 20 needs to be connected to the charging interface C- of the battery protection board 200.
[0042] In summary, the working principle of the battery protection board test system of the present invention is as follows:
[0043] During the test, the voltage input to the test control module 103 is adjusted by the voltage adjustment module 102 to make the voltage greater than the overcharge threshold voltage of the battery 104 or less than the overdischarge threshold voltage of the battery 104, and then the voltage is input to the battery through the test control module 103 The signal line interface of the protection board 200 is used to simulate the overcharge or overdischarge status of the battery 104. Finally, the electronic load 20 detects and displays the current value and/or voltage value of the test circuit. If the battery protection board 200 is overcharged or overdischarged If the protection function is normal, the battery protection board 200 will cut off the test circuit when the above-mentioned voltage is detected, so that the current value and/or voltage value detected and displayed by the electronic load 20 becomes zero, and vice versa. /Or the voltage value will not change, the test of the battery protection board 200 is realized, the test process of the battery protection board 200 is simplified, and the test efficiency is improved.
[0044] Reference Figure 4 In the battery protection board test method of the present invention, the battery protection board is connected with an electronic load and a test device to form a test loop, the test device includes a voltage regulation module, a test control module and a battery, and the test method includes the following steps:
[0045] Step S101: Adjust the input voltage input to the test control module through the voltage adjustment module so that the voltage value of the input voltage is greater than the overcharge protection threshold of the battery protection board or less than the overcharge protection threshold of the battery protection board. Discharge protection threshold; for example, the overdischarge protection threshold of the battery protection board is 2.8V, and the overcharge protection threshold of the battery protection board is 4.2V; for example, when testing the overdischarge of the battery protection board, the pass voltage The adjustment module adjusts the input voltage of the test control module to 2.7V; another example: when testing the overcharge of the battery protection board, adjust the input voltage of the input test control module to 4.3V through the voltage adjustment module;
[0046] In step S102, the voltage input to the signal line interface of the battery protection board is switched from the voltage of the battery to the input voltage through the test control module; for example: the signal line interface input to the battery protection board is made through the test control module Switch the voltage value of 2.7V; or, for example, switch the voltage value of the signal line interface input to the battery protection board to 4.3V through the test control module;
[0047] Step S103, detecting and displaying the current value and/or voltage value of the test circuit through the electronic load; for example, when the voltage value of the signal line interface input to the battery protection board is switched to 2.7V through the test control module, the electronic load detects And the current value of the test loop displayed is zero; another example: when the voltage value of the signal line interface input to the battery protection board is switched to 4.3V through the test control module, the voltage value of the test loop detected and displayed by the electronic load is zero ; Another example: when the voltage value of the signal line interface input to the battery protection board is switched to 4.3V through the test control module, the current value of the test loop detected and displayed by the electronic load is 0.1A;
[0048] Step S104: Determine whether the overcharge or overdischarge protection function of the battery protection board is normal according to the detection result. Specifically, if the detection result is zero, it is determined that the overcharge or overdischarge protection function of the battery protection board is normal; otherwise, it is determined that the overcharge or overdischarge protection function of the battery protection board is abnormal. For example: When the voltage value of the signal line interface input to the battery protection board is switched to 2.7V through the test control module, the current value of the test circuit detected and displayed by the electronic load is zero, so it is judged that the battery protection board is over-discharged The function is normal; another example: when the voltage value of the signal line interface input to the battery protection board is switched to 4.3V through the test control module, the voltage value of the test circuit detected and displayed by the electronic load is zero, so it is judged that the battery protection The overcharge function of the board is normal; another example: when the voltage value of the signal line interface input to the battery protection board is switched to 4.3V through the test control module, the current value of the test loop detected and displayed by the electronic load is 0.1A, so It is judged that the overcharge function of the battery protection board is abnormal.
[0049] The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made according to the essence of the present invention.
