A charging combination, a charger and a battery pack identification method

Abstract

A charging combination, a charger and a battery pack identification method, comprising a first battery pack (100), a second battery pack (200) and a charger (300), wherein the first battery pack has a first voltage detection terminal (12), the second battery pack has a second voltage detection terminal (22), the first voltage detection terminal (12) is grounded, and the second voltage detection terminal (22) is connected between two battery cells, and the charger identifies the first and second battery packs by detecting the voltage values ​​of the first and second voltage detection terminals (12, 22). The above-mentioned charging combination, charger and battery pack identification method have the advantages of not needing to use different identification elements, not needing to store corresponding data for the charger side in advance, being able to identify the disconnection of the battery pack terminal, and improving the utilization rate of the second voltage detection terminal.

Description

[Technical field]

[0001] The present invention relates to a charging assembly, a charger and a battery pack identification method, and in particular to a charging assembly, a charger and a battery pack identification method for an electric tool. [Background Technology]

[0002] With the development of battery pack charging technology, it is becoming more and more common for one charger to charge two different battery packs. The question that follows is how the charger can identify different battery packs. The existing solution is to have an identification element on one side of the battery pack, and the charger identifies the nominal voltage of the battery pack based on the difference in the identification element. Figure 1 As shown, the 12V battery pack and the 14.4V battery pack have identification elements R1 and R2 respectively, where R1 and R2 are resistors of different resistance values. The charger pre-stores the corresponding data. When the charger is connected to the battery pack, the charger detects the voltage value of the terminal T and obtains the value of the identification element R1 or R2, thereby determining whether the battery pack connected to the charger is a 12V battery pack or a 14.4V battery pack.

[0003] In the above scheme, the values ​​of the identification elements R1 and R2 must be different, and the corresponding data needs to be stored in advance for the charger side. The detection terminal T is idle after completing the task of identifying the battery pack, and the utilization rate is not high. At the same time, when the detection terminal T has a short circuit problem, the above scheme cannot identify it.

[0004] In view of this, it is indeed necessary to provide an improved charging combination, charger and battery pack identification method to overcome the defects of the prior art. [Summary of the invention]

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a charging combination, a charger and a battery pack identification method that are easy to identify different battery packs.

[0006] The present invention solves the problems of the prior art by adopting the following technical solutions: a battery pack identification method, comprising: a first battery pack 100, having a first nominal voltage, the first battery pack having a first voltage detection terminal 12, and the first voltage detection terminal 12 being grounded; a second battery pack 200, having a second nominal voltage, the second nominal voltage being different from the first nominal voltage, the second battery pack having a second voltage detection terminal 22, and the second voltage detection terminal 22 being connected between two battery cells; a charger 300, having a voltage identification terminal 32, when the voltage identification terminal 32 respectively detects the voltage value of the first voltage detection terminal 12 of the first battery pack or the second voltage detection terminal 22 of the second battery pack and meets the preset conditions, it is used to identify that the battery pack connected to the charger is the corresponding battery pack.

[0007] A further improved solution is: when the above preset condition is the first preset condition, it is determined that the second battery pack 200 is connected to the charger, and the second battery pack is directly charged.

[0008] A further improved solution is: when the voltage value detected by the voltage identification terminal 32 does not meet the first preset condition, the charger sends a pulse from the voltage identification terminal 32 to the first voltage detection terminal 12 or the second voltage detection terminal 22. If the voltage value detected by the voltage identification terminal 32 meets the second preset condition, it is determined that the first battery pack 100 is connected to the charger, and the first battery pack is charged; if the voltage value detected by the voltage identification terminal 32 of the charger meets the third preset condition, it is determined that the first voltage detection terminal 12 or the second voltage detection terminal 22 is open-circuited, and the charger 300 reports an open-circuit error; if the voltage value detected by the voltage identification terminal 32 of the charger meets the fourth preset condition, it is determined that an abnormality occurs in the charging combination, and the charger 300 reports an abnormality error.

[0009] A further improvement scheme is: the first battery pack 100 has a first positive terminal 11, the second battery pack 200 has a second positive terminal 21, and the charger 300 has a third positive terminal 31. The third positive terminal 31 of the charger is connected to the first positive terminal 11 or the second positive terminal 21. If the voltage value of the first positive terminal 11 or the second positive terminal 21 is less than 5V, the charger 300 activates and charges the first battery pack 100 or the second battery pack 200.

[0010] A further improvement is that the second voltage detection terminal 22 transmits a single cell voltage signal to the charger 300 during the charging process.

[0011] A further improvement is: the first preset condition is greater than 0.5V.

[0012] A further improvement is that the second preset condition is greater than 2V and less than 3V.

[0013] A further improvement is that the third preset condition is greater than or equal to 3V.

[0014] A further improvement is that the fourth preset condition is less than or equal to 2V.

[0015] The present invention can adopt another technical solution to solve the problems of the prior art: a charging combination, including: a first battery pack 100, having a first nominal voltage, and the first battery pack has a first voltage detection terminal 12; a second battery pack 200, having a second nominal voltage, the second nominal voltage is different from the first nominal voltage, and the second battery pack has a second voltage detection terminal 22; a charger 300, having a voltage identification terminal 32, the charger identifies one of the nominal voltage of the first battery pack 100 and the nominal voltage of the second battery pack 200, and charges the first and second battery packs; the first voltage detection terminal 12 is grounded, the second voltage detection terminal 22 is connected between two battery cells, the voltage identification terminal 32 of the charger is connected to the first voltage detection terminal 12 or the second voltage detection terminal 22, and the charger identifies the first and second battery packs by detecting the voltage values ​​of the first and second voltage detection terminals 12 and 22.

[0016] A further improved solution is: the first voltage detection terminal 12 is grounded via a resistor R3, and the second voltage detection terminal 22 is connected to the gap between two battery cells via a resistor R4.

[0017] A further improvement is that the resistance values ​​of the resistors R3 and R4 connected to the first and second voltage detection terminals 12 and 22 are the same.

[0018] A further improved solution is that the second voltage detection terminal 22 transmits a single cell voltage signal to the charger 300 during the charging process.

[0019] A further improvement scheme is: the first battery pack 100 has a first positive terminal 11, the second battery pack 200 has a second positive terminal 21, and the charger 300 has a third positive terminal 31. The third positive terminal 31 of the charger is connected to the first positive terminal 11 or the second positive terminal 21. If the voltage value of the first positive terminal 11 or the second positive terminal 21 is less than 5V, the charger 300 activates and charges the first battery pack 100 or the second battery pack 200.

[0020] A further improved solution is: the charger 300 has an MCU, and the MCU sends a pulse to the first voltage detection terminal 12 or the second voltage detection terminal 22 through the voltage identification terminal 32.

[0021] The present invention can adopt another technical solution to solve the problems of the prior art: a charger, comprising: an MCU; a voltage identification terminal 32, wherein the voltage identification terminal 32 corresponds to the first and second voltage detection terminals 12, 22 of the first and second battery packs 100, 200 with different nominal voltages, the first voltage detection terminal 12 is grounded, and the second voltage detection terminal 22 is connected between two battery cells; the charger identifies the first and second battery packs by detecting the voltage values ​​of the first and second voltage detection terminals 12, 22.

[0022] A further improved solution is: the MCU sends a pulse to the first voltage detection terminal 12 or the second voltage detection terminal 22 through the voltage identification terminal 32 .

[0023] A further improvement is as follows: the charger has a third positive terminal 31, and the third positive terminal 31 is connected to the first and second positive terminals 11, 12 of the first and second battery packs 100, 200 respectively. If the voltage value of the first positive terminal 11 or the second positive terminal 21 is less than 5V, the charger is activated for charging.

[0024] A further improved solution is that the voltage identification terminal 32 receives the single-cell voltage signal transmitted by the second voltage detection terminal 22 during the charging process.

[0025] Compared with the prior art, the present invention has the following beneficial effects: by grounding the first voltage detection terminal of the first battery pack and connecting the second voltage detection terminal of the second battery pack to the battery cell, compared with the prior art, it has the advantages of not needing to use different identification elements, not needing to store corresponding data for the charger side in advance, improving the utilization rate of the second voltage detection terminal, and being able to identify battery pack terminal short circuits, etc. [Drawings]

[0026] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the prior art for identifying a battery pack;

[0028] Figure 2 is a schematic diagram of a battery pack using the present invention;

[0029] Figure 3 This is an exploded view of the first battery pack;

[0030] Figure 4 This is an exploded view of the second battery pack;

[0031] Figure 5 is with Figure 2 Schematic diagram of the charger that matches the battery pack;

[0032] Figure 6 is a schematic diagram of connecting a charger to a first battery pack;

[0033] Figure 7 is a schematic diagram of the connection between the charger and the second battery pack;

[0034] Figure 8 It is a flow chart of the battery pack identification method of the present invention.

[0035] Meaning of the reference numerals in the figures:

[0036] 100: First battery pack 200: Second battery pack 300: Charger 1: Housing 2: Battery pack terminal 4: Circuit board 5: Charger terminal 11: First positive terminal 12: First voltage detection terminal 13, 14: First connection terminal 15: First negative terminal 16: First temperature detection terminal 21: Second positive terminal 22: Second voltage detection terminal 23, 24: Second connection terminal 25: Second negative terminal 26: Second temperature detection terminal 31: Third positive terminal 32: Voltage identification terminal 33, 34: Third connection terminal 35: Third negative terminal 36: Temperature identification terminal 301: MCU port [Specific implementation method]

[0037] See also Figures 2 to 4 The figure shows a schematic diagram of the battery pack of the present invention and an exploded diagram of the battery pack. The battery pack is provided with a housing 1, a battery pack terminal 2 mounted on the housing, a plurality of battery cells and a circuit board 4; in this embodiment, different numbers of battery cells can be installed in each battery pack, which are respectively referred to as the first and second battery packs, wherein the first battery pack 100 is a 12V battery pack composed of three lithium battery cells connected in series, and the second battery pack 200 is a 14.4V battery pack composed of four lithium battery cells connected in series. The battery pack provides power to electric tools such as electric drills, angle grinders, and electric circular saws.

[0038] See also Figure 5 , which is a schematic diagram of a charger 300 of the present invention. The charger 300 is provided with a charger terminal 5, and the charger terminal 5 is connected with the battery pack terminal 2 to charge the battery pack.

[0039] See also Figure 6As shown, it is a schematic diagram of the connection between the charger 300 of the present invention and the first battery pack 100, the charger terminal 5 is cooperatively connected with the battery pack terminal 2 of the first battery pack, wherein the charger terminal 5 is sequentially referred to as the third positive terminal 31, the voltage identification terminal 32, the third connection terminals 33, 34, the third negative terminal 35, and the temperature identification terminal 36, and the battery pack terminal 2 of the first battery pack 100 is sequentially referred to as the first positive terminal 11, the first voltage detection terminal 12, the first connection terminals 13, 14, the first negative terminal 15 and the first temperature detection terminal 16, and the six terminals of the charger 300 are connected one-to-one with the six terminals of the first battery pack 100. The first battery pack 100 is composed of three battery cells Cell1, Cell2, and Cell3 connected in series, and the first positive terminal 11 is directly connected to the positive electrode of the battery cell Cell3, the first voltage detection terminal 12 is grounded via a resistor R3, the first connection terminal 13 is connected to the negative electrode of the battery cell Cell3 (i.e., the positive electrode of the battery cell Cell2) via a resistor R2, the first connection terminal 14 is connected to the negative electrode of the battery cell Cell2 (i.e., the positive electrode of the battery cell Cell1) via a resistor R1, the first negative terminal 15 is directly connected to the negative electrode of the battery cell Cell1, the first temperature detection terminal 16 is connected to the negative electrode of the battery cell Cell1 via an NTC thermistor, and at the same time, the negative electrode of the battery cell Cell1 is grounded.

[0040] Please refer to Figure 7As shown, it is a schematic diagram of the connection between the charger 300 of the present invention and the second battery pack 200, the charger terminal 5 is cooperatively connected with the battery pack terminal 2 of the second battery pack, wherein the charger terminal 5 is sequentially referred to as the third positive terminal 31, the voltage identification terminal 32, the third connection terminals 33, 34, the third negative terminal 35, and the temperature identification terminal 36, and the battery pack terminal 2 of the second battery pack 200 is sequentially referred to as the second positive terminal 21, the second voltage detection terminal 22, the second connection terminals 23, 24, the second negative terminal 25 and the second temperature detection terminal 26, and the six terminals of the charger 300 are connected one-to-one with the six terminals of the second battery pack 200. The second battery pack 200 is composed of four battery cells Cell1, Cell2, Cell3, and Cell4 connected in series, and the second positive terminal 21 is directly connected to the positive electrode of the battery cell Cell4, the second voltage detection terminal 22 is connected to the negative electrode of the battery cell Cell4 (i.e., the positive electrode of the battery cell Cell3) via a resistor R4 (the resistance value of the resistor R4 may be the same as that of the resistor R3, or may be different from the resistance value of the resistor R3), the second connection terminal 23 is connected to the negative electrode of the battery cell Cell3 (i.e., the positive electrode of the battery cell Cell2) via a resistor R5, the second connection terminal 24 is connected to the negative electrode of the battery cell Cell2 (i.e., the positive electrode of the battery cell Cell1) via a resistor R6, the second negative terminal 25 is directly connected to the negative electrode of the battery cell Cell1, the second temperature detection terminal 26 is connected to the negative electrode of the battery cell Cell1 via an NTC thermistor, and at the same time, the negative electrode of the battery cell Cell1 is grounded.

[0041] Please refer to Figure 8The figure shows a flow chart of the battery pack identification method of the present invention. The charger first determines whether the battery pack needs to be activated, and then determines whether the second battery pack is connected to the charger. If so, the second battery pack is charged; if not, it then determines whether it is the first battery pack and whether it is a circuit break, abnormality, etc., and finally determines whether to charge the first battery pack or report a circuit break error and an abnormality error. The specific process is as follows: Step 1: Power on and determine whether the battery pack needs to be activated: The third positive terminal 31 of the charger 300 reads the voltage of the first positive terminal 11 or the second positive terminal 21, and determines whether the voltage is less than 5V. If so, the battery pack is activated. The cumulative activation time, if the activation time is greater than 5 minutes, the charger determines that the battery pack is a bad battery pack, and the charger reports an error. When the voltage of the first positive terminal 11 or the second positive terminal 21 is greater than or equal to 5V, the second step is executed; Step 2: Determine whether the battery connected to the charger is the second battery pack: The voltage identification terminal 32 of the charger 300 reads the voltage value of the first voltage detection terminal 12 or the second voltage detection terminal 22. If the voltage value meets the first preset condition, it is determined that the battery connected to the charger is the second battery pack 200, and the second battery pack is directly charged. In this embodiment, the first preset condition is greater than 0.5V. When the voltage value detected by the voltage identification terminal 32 does not meet the first preset condition, the third step is executed; the third step: send a pulse to the first voltage detection terminal 12 or the second voltage detection terminal 22. In this embodiment, the MCU of the charger 300 is configured to send a 5V pulse, that is, the MCU port 301 of the charger sends a 5V pulse, and then the fourth step is executed; the fourth step: determine whether the first battery pack is connected to the charger and whether it is disconnected, abnormal, etc.: after the charger sends the pulse, read the voltage value of the first voltage detection terminal 12 or the second voltage detection terminal 22 again. If the voltage value meets the second preset condition, it is determined that the first battery pack is connected to the charger; if the voltage value meets the third preset condition, it is determined that the first voltage detection terminal 12 or the second voltage detection terminal 22 is disconnected; if the voltage value meets the fourth preset condition, the charging combination is abnormal. In this embodiment, the second preset condition is greater than 2V and less than 3V, the third preset condition is greater than or equal to 3V, and the fourth preset condition is less than or equal to 2V. Please refer to the basis for setting the above conditions. Figure 6As shown, the MCU port 301 of the charger sends out a 5V pulse. In this embodiment, the resistance values ​​of the resistor R7 and the resistor R3 are the same. Therefore, if the first battery pack 100 is connected to the charger 300, the resistor R7 and the resistor R3 divide the above 5V voltage equally in the loop from the MCU port 301 to the resistor R7 to the resistor R3 to the ground. Then, the voltage value of the voltage identification terminal 32 of the charger is about 2.5V (that is, the voltage value of the first voltage detection terminal 12 is about 2.5V). In actual use, the second preset condition is set to be greater than 2V and less than 3V. Similarly, if the first voltage detection terminal 12 or the second voltage detection terminal 22 is disconnected, the loop from the MCU port 301 to the resistor R7 to the resistor R3 (or the resistor R4) is blocked. Therefore, the voltage value of the voltage identification terminal 32 of the charger is about 5V (that is, the voltage value of the first voltage detection terminal 12 or the second voltage detection terminal 22 is about 5V). In actual use, the third preset condition is set to be greater than or equal to 3V. It should be pointed out that the charger can only determine whether the connected battery pack is short-circuited, but cannot specifically determine whether the short-circuited battery pack is the first battery pack or the second battery pack. If the above two conditions are not met, that is, the voltage value of the voltage identification terminal 32 of the charger is less than or equal to 2V (that is, the fourth preset condition), then the charging combination is abnormal. In summary, when the second preset condition is met, it is determined that the first battery pack 100 is connected to the charger, and the charger charges the first battery pack; when the third preset condition is met, it is determined that the battery pack is short-circuited, and the charger reports a short-circuit error; when the fourth preset condition is met, the charging combination is abnormal, and the charger reports an abnormal error.

[0042] Please refer to Figure 6 and Figure 7 As shown, the charger 300 has a temperature identification terminal 36. When no battery pack is connected to the charger 300, the level of the temperature identification terminal 36 is high. When a battery pack is connected to the charger 300, the level of the temperature identification terminal 36 is pulled low. That is, when the first temperature detection terminal 16 or the second temperature detection terminal 26 is connected to the temperature identification terminal 36 of the charger, the level of the temperature identification terminal 36 is pulled low, and the charger 300 determines that a battery pack is inserted. At the same time, during the charging process, the first temperature detection terminal 16 or the second temperature detection terminal 26 transmits a temperature signal to the temperature identification terminal 36 of the charger 300 to prevent safety accidents caused by excessive temperature during the charging process.

[0043] Please refer to Figure 7 As shown, the second voltage detection terminal 22 of the second battery pack 200 transmits a single-cell voltage signal to the charger 300 during the charging process. That is, the second voltage detection terminal 22 can be used as an identification terminal when determining which battery pack is connected to the charger, and can transmit a single-cell voltage signal to the charger during the charging process, thereby greatly improving the utilization rate of the terminal.

[0044] The present invention is not limited to the above specific embodiments. A person skilled in the art can easily understand that there are many other alternatives to the battery pack charging system of the present invention without departing from the principle and scope of the present invention. The scope of protection of the present invention shall be subject to the content of the claims.

Claims

1. A battery pack identification method, comprising: A first battery pack (100) having a first nominal voltage, the first battery pack having a first voltage detection terminal (12), the first voltage detection terminal (12) being grounded; A second battery pack (200) having a second nominal voltage, the second nominal voltage being different from the first nominal voltage, the second battery pack having a second voltage detection terminal (22), the second voltage detection terminal (22) being connected between two battery cells; A charger (300) having a voltage identification terminal (32), wherein when the voltage identification terminal (32) detects a voltage value of a first voltage detection terminal (12) of the first battery pack or a second voltage detection terminal (22) of the second battery pack respectively and the voltage value meets a preset condition, the charger is identified as a corresponding battery pack; The step of identifying that the battery pack connected to the charger is a corresponding battery pack includes: When the preset condition is the first preset condition, it is determined that the battery pack (200) connected to the charger is the second battery pack, and the second battery pack is directly charged; When the voltage value detected by the voltage identification terminal (32) does not meet the first preset condition, the charger sends a pulse from the voltage identification terminal (32) to the first voltage detection terminal (12) or the second voltage detection terminal (22); if the voltage value detected by the voltage identification terminal (32) meets the second preset condition, it is determined that the first battery pack (100) is connected to the charger, and the first battery pack is charged; If the voltage value detected by the voltage identification terminal (32) of the charger meets a third preset condition, it is determined that the first voltage detection terminal (12) or the second voltage detection terminal (22) is disconnected, and the charger (300) issues a disconnection error report; If the voltage value detected by the voltage identification terminal (32) of the charger meets a fourth preset condition, it is determined that an abnormality occurs in the charging combination of the charger and the battery pack, and the charger (300) issues an abnormality error report; The starting point threshold of the first preset condition is smaller than the starting point threshold of the second preset condition; The starting point threshold of the second preset condition is smaller than the starting point threshold of the third preset condition; The end threshold of the fourth preset condition is smaller than the start threshold of the second preset condition.

2. The battery pack identification method according to claim 1, characterized in that: The first battery pack (100) has a first positive terminal (11), the second battery pack (200) has a second positive terminal (21), and the charger (300) has a third positive terminal (31). The third positive terminal (31) of the charger is connected to the first positive terminal (11) or the second positive terminal (21). If the voltage value of the first positive terminal (11) or the second positive terminal (21) is less than 5V, the charger (300) activates and charges the first battery pack (100) or the second battery pack (200).

3. The battery pack identification method according to claim 1, characterized in that: The second voltage detection terminal (22) transmits a single cell voltage signal to the charger (300) during the charging process.

4. The battery pack identification method according to claim 1, characterized in that: The first preset condition is greater than 0.5V.

5. The battery pack identification method according to claim 1, characterized in that: The second preset condition is greater than 2V and less than 3V.

6. The battery pack identification method according to claim 1, characterized in that: The third preset condition is greater than or equal to 3V.

7. The battery pack identification method according to claim 1, characterized in that: The fourth preset condition is less than or equal to 2V.

8. A charging combination, comprising: A first battery pack (100) having a first nominal voltage, the first battery pack having a first voltage detection terminal (12); A second battery pack (200) having a second nominal voltage, the second nominal voltage being different from the first nominal voltage, the second battery pack having a second voltage detection terminal (22); A charger (300) having a voltage identification terminal (32), wherein the charger identifies one of the nominal voltage of the first battery pack (100) and the nominal voltage of the second battery pack (200), and charging the first and second battery packs; The invention is characterized in that: the first voltage detection terminal (12) is grounded, the second voltage detection terminal (22) is connected between two battery cells, the voltage identification terminal (32) of the charger is connected to the first voltage detection terminal (12) or the second voltage detection terminal (22), and the charger identifies the first battery pack and the second battery pack by detecting the voltage values ​​of the first voltage detection terminal (12) and the second voltage detection terminal (22); The charger detects the voltage values ​​of the first voltage detection terminal (12) and the second voltage detection terminal (22) to identify the first battery pack and the second battery pack, comprising: When the preset condition is the first preset condition, it is determined that the battery pack (200) connected to the charger is the second battery pack, and the second battery pack is directly charged; When the voltage value detected by the voltage identification terminal (32) does not meet the first preset condition, the charger sends a pulse from the voltage identification terminal (32) to the first voltage detection terminal (12) or the second voltage detection terminal (22); if the voltage value detected by the voltage identification terminal (32) meets the second preset condition, it is determined that the first battery pack (100) is connected to the charger, and the first battery pack is charged; If the voltage value detected by the voltage identification terminal (32) of the charger meets a third preset condition, it is determined that the first voltage detection terminal (12) or the second voltage detection terminal (22) is disconnected, and the charger (300) issues a disconnection error report; If the voltage value detected by the voltage identification terminal (32) of the charger meets a fourth preset condition, it is determined that an abnormality occurs in the charging combination of the charger and the battery pack, and the charger (300) issues an abnormality error report; The starting point threshold of the first preset condition is smaller than the starting point threshold of the second preset condition; The starting point threshold of the second preset condition is smaller than the starting point threshold of the third preset condition; The end threshold of the fourth preset condition is smaller than the start threshold of the second preset condition.

9. The charging assembly according to claim 8, characterized in that: The first voltage detection terminal (12) is grounded via a first resistor (R3), and the second voltage detection terminal (22) is connected between two battery cells via a second resistor (R4).

10. The charging assembly according to claim 9, characterized in that: The resistance value of the first resistor (R3) and the resistance value of the second resistor (R4) respectively connected to the first voltage detection terminal (12) and the second voltage detection terminal (22) are the same.

11. The charging assembly according to claim 10, characterized in that: The second voltage detection terminal (22) transmits a single cell voltage signal to the charger (300) during the charging process.

12. The charging assembly according to claim 10, characterized in that: The first battery pack (100) has a first positive terminal (11), the second battery pack (200) has a second positive terminal (21), and the charger (300) has a third positive terminal (31). The third positive terminal (31) of the charger is connected to the first positive terminal (11) or the second positive terminal (21). If the voltage value of the first positive terminal (11) or the second positive terminal (21) is less than 5V, the charger (300) activates and charges the first battery pack (100) or the second battery pack (200).

13. The charging assembly according to claim 10, characterized in that: The charger (300) has an MCU, and the MCU sends a pulse to the first voltage detection terminal (12) or the second voltage detection terminal (22) through a voltage identification terminal (32).

14. A charger, comprising: MCU; A voltage identification terminal (32), wherein the voltage identification terminal (32) is connected to a first voltage detection terminal (12) and a second voltage detection terminal (22) of a first battery pack (100) and a second battery pack (200) having different nominal voltages, The first voltage detection terminal (12) is grounded, and the second voltage detection terminal (22) is connected between two battery cells; The charger identifies the first battery pack and the second battery pack by detecting the voltage values ​​of the first voltage detection terminal (12) and the second voltage detection terminal (22); The charger detects the voltage values ​​of the first voltage detection terminal (12) and the second voltage detection terminal (22) to identify the first battery pack and the second battery pack, comprising: When the preset condition is the first preset condition, it is determined that the battery pack (200) connected to the charger is the second battery pack, and the second battery pack is directly charged; When the voltage value detected by the voltage identification terminal (32) does not meet the first preset condition, the charger sends a pulse from the voltage identification terminal (32) to the first voltage detection terminal (12) or the second voltage detection terminal (22); if the voltage value detected by the voltage identification terminal (32) meets the second preset condition, it is determined that the first battery pack (100) is connected to the charger, and the first battery pack is charged; If the voltage value detected by the voltage identification terminal (32) of the charger meets a third preset condition, it is determined that the first voltage detection terminal (12) or the second voltage detection terminal (22) is disconnected, and the charger (300) issues a disconnection error report; If the voltage value detected by the voltage identification terminal (32) of the charger meets a fourth preset condition, it is determined that an abnormality occurs in the charging combination of the charger and the battery pack, and the charger (300) issues an abnormality error report; The starting point threshold of the first preset condition is smaller than the starting point threshold of the second preset condition; The starting point threshold of the second preset condition is smaller than the starting point threshold of the third preset condition; The end threshold of the fourth preset condition is smaller than the start threshold of the second preset condition.

15. The charger according to claim 14, characterized in that: The MCU sends a pulse to the first voltage detection terminal (12) or the second voltage detection terminal (22) through a voltage identification terminal (32).

16. The charger according to claim 14, characterized in that: The charger has a third positive terminal (31), and the third positive terminal (31) is connected to the first positive terminal (11) and the second positive terminal (21) of the first battery pack (100) and the second battery pack (200) respectively. If the voltage value of the first positive terminal (11) or the second positive terminal (21) is less than 5V, the charger is activated for charging.

17. The charger according to claim 14, characterized in that: The voltage identification terminal (32) receives the single-cell voltage signal transmitted by the second voltage detection terminal (22) during the charging process.

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