Charging interface capacity expansion device and charging device

Abstract

The utility model discloses a charging interface capacity expansion device and a charging device. The charging interface capacity expansion device comprises a charging input end, at least two groups of charging output ends, a control module, at least two voltage detection modules and at least two charging switch modules, the charging input end is used for connecting a charger; the charging output end is used for connecting a battery pack; the voltage detection module is electrically connected with the control module and one group of charging output ends, and is used for detecting the voltage of the battery pack connected with the charging output ends under the control of the control module; the charging switch module is electrically connected with the charging input end and one group of charging output ends, and the charging switch module is also connected with the control module; the control module is used for controlling the conduction state of the charging switch module according to the voltages detected by the at least two voltage detection modules. According to the technical scheme of the embodiment of the utility model, the capacity expansion requirement of the charging interface can be realized, the charging management of a plurality of battery packs is realized, and the user satisfaction is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery charging, in particular to a charging interface expansion device and a charging device. Background Art

[0002] At present, most of the common chargers on the market can only charge one battery pack, and it is very difficult for a single charger to charge two or more battery packs simultaneously in a period of time. For users who need to use multiple battery packs during the day, they have to buy multiple chargers or manually expand the charger.

[0003] When multiple chargers need to be purchased, it increases the user's usage cost, thus reducing the user's actual usage experience and satisfaction. When manually expanding the charger, due to mechanical structure and electronic communication limitations, even if the charging capacity is manually expanded by adding external connection lines, normal charging cannot be achieved, restricting the customer's expansion needs and resulting in a decrease in user satisfaction. Summary of the Utility Model

[0004] The utility model provides a charging interface expansion device and a charging device to meet the expansion requirements of the charging interface, realize the charging management of multiple battery packs, and improve user satisfaction.

[0005] According to one aspect of the utility model, a charging interface expansion device is provided. The charging interface expansion device includes a charging input end, at least two groups of charging output ends, a control module, at least two voltage detection modules, and at least two charging switch modules. The charging input end is used to connect to a charger, and the charging output end is used to connect to a battery pack.

[0006] The voltage detection modules are respectively electrically connected to the control module and one group of the charging output ends, and are used to detect the voltage of the battery pack connected to the charging output end under the control of the control module.

[0007] The charging switch modules are respectively electrically connected to the charging input end and one group of the charging output ends, and the charging switch modules are also connected to the control module.

[0008] The control module is used to control the conduction state of the charging switch modules according to the voltages detected by at least two of the voltage detection modules.

[0009] Optionally, the charging input end includes a positive input end and a negative input end; each group of the charging output ends includes a positive output end and a negative output end.

[0010] The positive output end is used to connect to the positive pole of the battery pack, and the negative output end is used to connect to the negative pole of the battery pack.

[0011] The control terminal of the charging switch module is electrically connected to the control module. The first terminal of the charging switch module is electrically connected to the charging input terminal. The second terminal of the charging switch module is electrically connected to one of the positive output terminals;

[0012] The negative output terminal is electrically connected to the negative input terminal.

[0013] Optionally, the voltage detection module includes a first transistor and a voltage dividing unit;

[0014] The first transistor and the voltage dividing unit are connected in series between the charging output terminal and the ground. The control electrode of the first transistor is electrically connected to the control module. The output terminal of the voltage dividing unit is electrically connected to the control module; the control module is configured to determine the power of the battery connected to the charging output terminal according to the voltage at the output terminal of the voltage dividing unit, and determine the charging sequence of each battery according to the power of the battery.

[0015] Optionally, the charging switch module includes a control unit and a switch unit;

[0016] The control terminal of the control unit is electrically connected to the control module. The first terminal of the control unit is electrically connected to the control terminal of the switch unit. The second terminal of the control unit is grounded. The control unit is configured to control the conduction state of the switch unit according to the control signal output by the control module; the first terminal of the switch unit is electrically connected to the charging input terminal, and the second terminal of the switch unit is electrically connected to one group of the charging output terminals.

[0017] Optionally, the control unit includes a second transistor, and the switch unit includes a third transistor and a fourth transistor;

[0018] The control electrode of the second transistor is connected to the control module. The first electrode of the second transistor is connected to the control electrodes of the third transistor and the fourth transistor. The second electrode of the second transistor is grounded. The second electrode of the third transistor is electrically connected to the charging input terminal. The first electrode of the third transistor is electrically connected to the first electrode of the fourth transistor. The second electrode of the fourth transistor is electrically connected to the charging output terminal.

[0019] Optionally, the control unit further includes a first resistor, a second resistor and a voltage stabilizing diode;

[0020] The first end of the first resistor is electrically connected to the first pole of the second transistor. The second end of the first resistor is electrically connected to the control pole of the third transistor, the first end of the second resistor, the control pole of the fourth transistor, and the first pole of the voltage stabilizing diode. The second end of the second resistor is electrically connected to the first pole of the third transistor, the first pole of the fourth transistor, and the second pole of the voltage stabilizing diode.

[0021] Optionally, the charging interface expansion device further includes at least two communication switch modules. The charging input end further includes a first communication end, and the first communication end is communicatively connected to the second communication end of the control module. The control end of the communication switch module is electrically connected to the control module. The first end of the communication switch module is communicatively connected to the first communication end, and the second end of the communication switch module is electrically connected to the control module.

[0022] Each group of the charging output ends further includes a third communication end, and the second end of the communication switch module is also communicatively connected to the third communication end in one-to-one correspondence.

[0023] The control module is configured to determine a target battery pack according to the voltages detected by at least two of the voltage detection modules, control the communication switch module corresponding to the target battery pack to conduct, and after determining that the target battery pack is in a connected state with the charger, control the charging switch module corresponding to the target battery pack to conduct.

[0024] Optionally, the control module further includes at least two fourth communication ends, and the fourth communication ends are communicatively connected to the third communication ends in one-to-one correspondence. The communication switch module includes a fifth transistor.

[0025] The control pole of the fifth transistor is electrically connected to the control module. The first pole of the fifth transistor is electrically connected to the control module and is communicatively connected to a third communication end and a fourth communication end respectively. The second pole of the fifth transistor is communicatively connected to the first communication end and the second communication end.

[0026] Optionally, the charging interface expansion device further includes a charging current detection module.

[0027] The first end of the charging current detection module is electrically connected to the negative input end. The second end of the charging current detection module is electrically connected to the negative output end. The charging current detection module is also electrically connected to the control module.

[0028] The control module is further configured to detect the charging current of the charger for the battery pack through the charging current detection module, and control to reduce the duty cycle of the corresponding charging switch module when the charging current is greater than a preset current threshold.

[0029] According to another aspect of the present utility model, there is provided a charging device, including the charging interface expansion device and a charger provided in any of the above embodiments.

[0030] In the technical solution of the embodiment of the present utility model, by providing a control module, at least two voltage detection modules and at least two charging switch modules, when multiple battery packs are connected simultaneously, the correspondingly connected voltage detection modules can detect the voltages of the battery packs and input them to the control module. The control module controls the conduction states of the charging switch modules according to the input voltages, so as to automatically control the charging process of the battery packs. The control module can output control signals to make different charging switch modules conduct at different time periods, enabling the charger to charge different battery packs through the charging interface expansion device, thereby realizing automatic charging of multiple battery packs by a single charger, that is, realizing the charging function of expanding the charging port, and further being able to avoid the situation where users need to purchase multiple chargers to charge multiple battery packs, being able to avoid increasing the cost of users, and thus improving customer satisfaction. Moreover, the charging management of multiple battery packs is automatically controlled by the control module, precisely controlling the requirements of the battery packs, thereby realizing an efficient charging process and reducing energy waste.

[0031] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 It is a schematic structural diagram of a charging interface expansion device provided by an embodiment of the present utility model;

[0034] Figure 2 It is a schematic structural diagram of another charging interface expansion device provided by an embodiment of the present utility model;

[0035] Figure 3 It is a schematic structural diagram of another charging interface expansion device provided by an embodiment of the present utility model;

[0036] Figure 4 It is a schematic structural diagram of another charging interface expansion device provided by an embodiment of the present utility model;

[0037] Figure 5Schematic diagram of another charging interface expansion device provided by an embodiment of the present utility model;

[0038] Figure 6 Schematic diagram of another charging interface expansion device provided by an embodiment of the present utility model. Detailed implementation manners

[0039] In order to enable those skilled in the art to better understand the solutions of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and their variants are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0041] Figure 1 Schematic diagram of a charging interface expansion device provided by an embodiment of the present utility model, refer to Figure 1 , the charging interface expansion device 100 includes a charging input end 200, at least two groups of charging output ends, a control module 10, at least two voltage detection modules, and at least two charging switch modules; the charging input end 200 is used to connect to a charger, and the charging output ends are used to connect to battery packs; the voltage detection modules are electrically connected to the control module 10 and one of the groups of charging output ends respectively, and are used to detect the voltage of the battery pack connected to the charging output end under the control of the control module 10; the charging switch modules are electrically connected to the charging input end 200 and one of the groups of charging output ends respectively, and the charging switch modules are also connected to the control module 10; the control module 10 is used to control the on-off state of the charging switch modules according to the voltages detected by at least two voltage detection modules.

[0042] Among them, the control module 10 may include a first end 101, a second end 102, a third end 111, and a fourth end 112; at least two groups of charging output terminals may exemplarily include two charging output terminals, namely a first charging output terminal 300 and a second charging output terminal 301; at least two voltage detection modules may exemplarily include two voltage detection modules, namely a first voltage detection module 21 and a second voltage detection module 22. The first end of the first voltage detection module 21 is connected to the fourth end 112 of the control module 10, and the second end of the first voltage detection module 21 is connected to the first charging output terminal 300; the first end of the second voltage detection module 22 is connected to the third end 111 of the control module 10, and the second end of the second voltage detection module 22 is connected to the second charging output terminal 301; at least two charging switch modules may exemplarily include two charging switch modules, namely a first charging switch module 31 and a second charging switch module 32. The first end of the first charging switch module 31 is connected to the charging input terminal 200, the second end of the first charging switch module 31 is connected to the first charging output terminal 300, and the third end of the first charging switch module 31 is connected to the first end 101 of the control module 10; the first end of the second charging switch module 32 is connected to the charging input terminal 200, the second end of the second charging switch module 32 is connected to the second charging output terminal 301, and the third end of the second charging switch module 32 is connected to the second end 102 of the control module 10. Hereinafter, taking the example of inserting two battery packs simultaneously is used for illustration, and the battery pack connected to the first charging switch module 31 is denoted as the first battery pack, and the battery pack connected to the second charging switch module 32 is the second battery pack. It can be understood that in other embodiments, at least two groups of charging output terminals, at least two voltage detection modules, and at least two charging switch modules may be multiple (more than 2), and the number of inserted battery packs may also be multiple.

[0043] Specifically, when the user needs to charge two battery packs, first insert the two battery packs. At this time, the first battery pack is connected to the first charging output terminal 300, and the second battery pack is connected to the second charging output terminal 301. After connecting the charger to the charging interface expansion device 100 and connecting the charger to the mains power. At this time, the first voltage detection module 21 and the second voltage detection module 22 respectively detect the voltages of the corresponding connected battery packs, and input the detected voltages to the control module 10. Then, the control module 10 automatically allocates the charging order of the battery packs according to the voltages. Exemplarily, if the voltage of the first battery pack connected to the first charging output terminal 300 is V1, the voltage detected by the first voltage detection module 21 is V11, and V11 is positively correlated with V1, and this voltage V11 is input to the control module 10; if the voltage of the second battery pack connected to the second charging output terminal 301 is V2, the voltage detected by the second voltage detection module 22 is V22, and V22 is positively correlated with V2, and this voltage V22 is input to the control module 10. Then, the control module 10 allocates the charging order of the two battery packs according to the magnitudes of the voltage V11 and the voltage V22. For example, the control module 10 can allocate the battery pack with the larger detected voltage to be charged. That is, when V11 > V22, the control module 10 outputs a first control signal to turn on the first charging switch module 31, so that the charger charges the first battery pack first through the charging input terminal 200. After the charging is completed, the control module 10 outputs a second control signal to turn off the first charging switch module 31, and outputs a third control signal to turn on the second charging switch module 32, so that the charger charges the second battery pack through the charging input terminal 200. Or, after a preset charging time, the control module 10 outputs a second control signal to turn off the first charging switch module 31, and outputs a third control signal to turn on the second charging switch module 32, so that the charger charges the second battery pack through the charging input terminal 200. It can be understood that the charging method for the second battery pack also includes charging completion or a preset charging time.

[0044] Alternatively, the control module 10 can allocate the battery pack with a smaller detected voltage for charging. That is, when V11 > V22, the control module 10 outputs a third control signal to turn on the second charging switch module 32, so that the charger charges the second battery pack first through the charging input terminal 200. After the charging is completed, the control module 10 outputs a fourth control signal to turn off the second charging switch module 32, and outputs a first control signal to turn on the first charging switch module 31, so that the charger charges the first battery pack through the charging input terminal 200. Alternatively, after a preset charging time, the control module 10 outputs a fourth control signal to turn off the second charging switch module 32, and outputs a first control signal to turn on the first charging switch module 31, so that the charger charges the first battery pack through the charging input terminal 200. It can be understood that the charging method for the first battery pack also includes charging until completion or a preset charging time. That is, the first battery pack and the second battery pack can be charged by alternately charging them for a preset time. It should be noted that the charging methods for different battery packs can also be other methods, which are not specifically limited in the embodiments of the present invention.

[0045] In the technical solution of the embodiment of the present invention, by setting a control module, at least two voltage detection modules and at least two charging switch modules, when multiple battery packs are connected at the same time, the corresponding connected voltage detection modules can detect the voltages of the battery packs and input them to the control module. The control module automatically controls the on-off states of the charging switch modules according to the input voltages, so as to automatically control the charging process of the battery packs. The control module can output control signals to turn on different charging switch modules at different times, so that the charger can charge different battery packs through the charging interface expansion device, thereby realizing automatic charging of multiple battery packs by a single charger, that is, realizing the charging function of charging port expansion, and further avoiding the situation where users need to purchase multiple chargers to charge multiple battery packs, avoiding increasing the cost of users, and thus improving customer satisfaction. Moreover, the charging management of multiple battery packs is automatically controlled by the control module, and the demand for battery packs is accurately controlled, so as to realize an efficient charging process and reduce energy waste.

[0046] Figure 2 is a schematic structural diagram of another charging interface expansion device provided by the embodiment of the present invention. Refer to Figure 2, on the basis of the above embodiments, the charging input end 200 includes a positive input end CH-BAT+ and a negative input end CH-BAT-; each group of charging output ends includes a positive output end and a negative output end; the positive output end is used to connect to the positive electrode of the battery pack, and the negative output end is used to connect to the negative electrode of the battery pack; the control end of the charging switch module is electrically connected to the control module 10, the first end of the charging switch module is electrically connected to the charging input end CH-BAT+, and the second end of the charging switch module is electrically connected to a positive output end; the negative output end is electrically connected to the negative input end CH-BAT-.

[0047] Among them, the third end of the first charging switch 31 serves as the control end of the first charging switch module 31 and is electrically connected to the first end 101 of the control module 10, and the first end of the first charging switch module 31 is electrically connected to the positive input end CH-BAT+; the third end of the second charging switch 32 serves as the control end of the second charging switch module 32 and is electrically connected to the second end 102 of the control module 10, and the first end of the second charging switch module 32 is electrically connected to the positive input end CH-BAT+; the first charging output end 300 includes a first positive output end BAT1+ and a first negative output end BAT1-; the second charging output end 301 includes a second positive output end BAT2+ and a second negative output end BAT2-; the first negative output end BAT1-, the second negative output end BAT2- are electrically connected to the negative input end CH-BAT-, and the negative input end CH-BAT- is grounded.

[0048] Specifically, when the user needs to charge two battery packs, first insert the two battery packs. At this time, the first battery pack is connected to the first positive output end BAT1+ and the first negative output end BAT1-, and the second battery pack is connected to the second positive output end BAT2+ and the second negative output end BAT2-. At the same time, the positive input end CH-BAT+ and the negative input end CH-BAT- are connected to the mains. At this time, the first voltage detection module 21 and the second voltage detection module 22 respectively detect the voltages of the corresponding connected battery packs through the first positive output end BAT1+ and the second positive output end BAT2+, and input the detected voltages into the control module 10. Then, the control module 10 automatically allocates the charging sequence of the battery packs according to this voltage.

[0049] Figure 3 This is a schematic structural diagram of another charging interface expansion device provided by the embodiment of the present invention. Refer to Figure 3, based on the above embodiments, the voltage detection module includes a first transistor and a voltage dividing unit; the first transistor and the voltage dividing unit are connected in series between the charging output terminal and the ground, the control electrode of the first transistor is electrically connected to the control module, and the output terminal of the voltage dividing unit is electrically connected to the control module 10; the control module 10 is configured to determine the power of the battery connected to the charging output terminal according to the voltage at the output terminal of the voltage dividing unit, and determine the charging sequence of each battery according to the power of the battery.

[0050] Wherein, the first voltage detection module 21 may include a first transistor Q31 and a first voltage dividing unit 23, and the first voltage dividing unit 23 may include a third resistor R3 and a fourth resistor R4. Exemplarily, the connection relationship between the first transistor Q31, the third resistor R3, and the fourth resistor R4 may be: the control electrode of the first transistor Q31 is electrically connected to the fifth terminal Vpack of the control module 10, the first electrode of the first transistor Q31 is connected to the first end of the fourth resistor R4, the second electrode of the first transistor Q31 is connected to the second end of the third resistor R3, the first end of the third resistor R3 is connected to the first positive output terminal BAT1+, and the second end of the fourth resistor R4 is grounded; the second voltage detection module 22 may include a second transistor Q32 and a second voltage dividing unit 24, the second voltage dividing unit 24 may include a fifth resistor R5 and a sixth resistor R6, the control electrode of the second transistor Q32 is electrically connected to the fifth terminal Vpack of the control module 10, the first electrode of the second transistor Q32 is connected to the first end of the sixth resistor R6, the second electrode of the second transistor Q32 is connected to the second end of the fifth resistor R5, the first end of the fifth resistor R5 is connected to the first positive output terminal BAT1+, and the second end of the sixth resistor R6 is grounded.

[0051] Specifically, when multiple battery packs are inserted, there are voltages on both the first positive output terminal BAT1+ and the second positive output terminal BAT2+. For example, the voltage of the first positive output terminal BAT1+ is V1, and the voltage of the second positive output terminal BAT2+ is V2. When the fifth terminal Vpack of the control module 10 outputs a high level, the first transistor Q31 and the second transistor Q32 are turned on, and then voltage division is performed through the voltage dividing unit. The detected voltage output by the first voltage dividing unit 23 is V11, and the detected voltage output by the second voltage dividing unit 24 is V22. Then, the control module 10 automatically allocates the charging sequence of the battery packs according to the magnitudes of the detected voltages.

[0052] The technical solution of the embodiment of the present utility model can detect the voltages of the inserted battery packs simultaneously by setting transistors and voltage dividing units, and the control electrodes of the transistors are jointly controlled by a control module. The control module can automatically allocate the charging sequence according to the voltage states of each battery pack, ensuring that each battery pack is properly charged, thereby improving the overall charging efficiency, reducing energy waste, and enhancing the energy efficiency of the system. Moreover, through automated charging management, the need for manual intervention is reduced, thus lowering the maintenance cost and operation complexity.

[0053] Figure 4 FIG. is a schematic structural diagram of another charging interface expansion device provided by the embodiment of the present utility model. Refer to Figure 4 , on the basis of the above embodiments, the charging switch module includes a control unit and a switch unit; the control end of the control unit is electrically connected to the control module 10, the first end of the control unit is electrically connected to the control end of the switch unit, the second end of the control unit is grounded, and the control unit is used to control the conduction state of the switch unit according to the control signal output by the control module 10; the first end of the switch unit is electrically connected to the charging input terminal 200, and the second end of the switch unit is electrically connected to one group of charging output terminals.

[0054] Among them, the first charging switch module 31 includes a first control unit 33 and a first switch unit 34. The control end of the first control unit 33 is electrically connected to the first end 101 of the control module 10, the first end of the first control unit 33 is electrically connected to the control end of the first switch unit 34, the second end of the first control unit 33 is grounded, the first end of the first switch unit 34 is electrically connected to the positive input terminal CH-BAT+, and the second end of the first switch unit 34 is electrically connected to the first positive output terminal BAT1+; the second charging switch module 32 includes a second control unit 35 and a second switch unit 36. The control end of the second control unit 35 is electrically connected to the second end 102 of the control module 10, the first end of the second control unit 35 is electrically connected to the control end of the second switch unit 36, the second end of the second control unit 35 is grounded, the first end of the second switch unit 36 is electrically connected to the positive input terminal CH-BAT+, and the second end of the second switch unit 36 is electrically connected to the second positive output terminal BAT2+.

[0055] Specifically, when the control module 10 allocates the first battery pack for charging according to the detected voltage, the control module 10 outputs a first control signal, so that the first control unit 33 responds to the first control signal to control the first switch unit 34 to conduct, thereby charging the first battery pack. After the control module 10 determines that the first battery pack is fully charged, it outputs a second control signal. Then, the first control unit 33 responds to the second control signal to control the first switch unit 34 to turn off. At the same time, the control module 10 outputs a third control signal, and the second control unit 35 responds to the third control signal to control the second switch unit 36 to conduct, thereby charging the second battery pack.

[0056] Optionally, continuing to refer to Figure 4 , the control unit includes a second transistor, and the switch unit includes a third transistor and a fourth transistor; the control electrode of the second transistor is electrically connected to the control module 10, the first electrode of the second transistor is connected to the control electrodes of the third transistor and the fourth transistor, the second electrode of the second transistor is grounded, the second electrode of the third transistor is electrically connected to the charging input terminal 200, the first electrode of the third transistor is electrically connected to the first electrode of the fourth transistor, and the second electrode of the fourth transistor is electrically connected to the charging output terminal.

[0057] Among them, the first control unit 33 includes a second transistor Q1 of the first type, the first switch unit 34 includes a third transistor Q11 of the first type and a fourth transistor Q12 of the first type. The control electrode of the second transistor Q1 of the first type serves as the control terminal of the first control unit 33, the first electrode of the second transistor Q1 of the first type serves as the first terminal of the first control unit 33, and the second electrode of the second transistor Q1 of the first type serves as the second terminal of the first control unit 33. The control electrodes of the third transistor Q11 of the first type and the fourth transistor Q12 of the first type serve as the control terminal of the first switch unit 34, the second electrode of the third transistor Q11 of the first type serves as the first terminal of the first switch unit 34, and the second electrode of the fourth transistor Q12 of the first type serves as the second terminal of the first switch unit 34. The control electrode of the second transistor Q1 of the first type is electrically connected to the first terminal 101 of the control module 10. The first electrode of the second transistor Q1 of the first type is connected to the control electrodes of the third transistor Q11 of the first type and the fourth transistor Q12 of the first type, and the second electrode of the second transistor Q1 of the first type is grounded. The first electrodes of the third transistor Q11 of the first type and the fourth transistor Q12 of the first type are connected, the second electrode of the third transistor Q11 of the first type is electrically connected to the positive input terminal CH-BAT+, and the second electrode of the fourth transistor Q12 of the first type is electrically connected to the first positive output terminal BAT1+. The second control unit 35 includes a second transistor Q2 of the second type, the second switch unit 36 includes a third transistor Q21 of the second type and a fourth transistor Q22 of the second type. The control electrode of the second transistor Q2 of the second type serves as the control terminal of the second control unit 35, the first electrode of the second transistor Q2 of the second type serves as the first terminal of the second control unit 35, and the second electrode of the second transistor Q2 of the second type serves as the second terminal of the second control unit 35. The control electrodes of the third transistor Q21 of the second type and the fourth transistor Q22 of the second type serve as the control terminal of the second switch unit 36, the second electrode of the third transistor Q21 of the second type serves as the first terminal of the second switch unit 36, and the second electrode of the fourth transistor Q22 of the second type serves as the second terminal of the second switch unit 36. The control electrode of the second transistor Q2 of the second type is electrically connected to the first terminal 101 of the control module 10. The first electrode of the second transistor Q2 of the second type is connected to the control electrodes of the third transistor Q21 of the second type and the fourth transistor Q22 of the second type, and the second electrode of the second transistor Q2 of the second type is grounded. The first electrodes of the third transistor Q21 of the second type and the fourth transistor Q22 of the second type are connected, the second electrode of the third transistor Q21 of the second type is electrically connected to the positive input terminal CH-BAT+, and the second electrode of the fourth transistor Q22 of the second type is electrically connected to the second positive output terminal BAT2+.

[0058] Among them, the third transistor Q11 of the first type and the third transistor Q21 of the second type are used to prevent a battery pack from reverse charging the charger or other battery packs.

[0059] Specifically, when the control module 10 allocates the first battery pack for charging according to the detected voltage, the first terminal 101 of the control module 10 outputs a first control signal (for example, high level), and the second transistor Q1 conducts, causing the control electrodes of the third transistor Q11 and the fourth transistor Q12 to be at low level and thus conducting to charge the first battery pack. After the charging is completed, the first terminal 101 of the control module 10 outputs a second control signal (for example, low level), and the second transistor Q1 is turned off, causing the third transistor Q11 and the fourth transistor Q12 to turn off. Due to the presence of the third transistor Q11, when the second transistor Q1 is turned off, the voltage of the first battery pack cannot reverse charge the charger or the second battery pack through the third transistor Q11. At the same time, the second terminal 102 of the control module 10 outputs a third control signal (for example, high level), and the second transistor Q2 conducts, causing the control electrodes of the third transistor Q21 and the fourth transistor Q22 to be at low level and thus conducting to charge the second battery pack. Due to the presence of the third transistor Q21, when the second transistor Q2 is turned off, the voltage of the second battery pack cannot reverse charge the charger or the first battery pack through the third transistor Q21.

[0060] The technical solution of the embodiment of the present utility model can prevent a battery pack from reverse charging the charger or other battery packs by setting the third transistor Q1 and the third transistor Q2, which can prevent damage to the battery pack caused by current backflow, and can reduce the risk of short circuit, electrical fire or other safety accidents in the battery system, thereby improving the safety of the overall system.

[0061] Optionally, continue to refer to Figure 4 , the charging switch module further includes a first resistor, a second resistor and a voltage stabilizing diode; the first end of the first resistor is electrically connected to the first electrode of the second transistor, and the second end of the first resistor is electrically connected to the control electrode of the third transistor, the first end of the second resistor, the control electrode of the fourth transistor, and the first electrode of the voltage stabilizing diode. The second end of the second resistor is electrically connected to the first electrode of the third transistor, the first electrode of the fourth transistor, and the second electrode of the voltage stabilizing diode.

[0062] Among them, the first charging switch module 31 further includes a first resistor R1, a second resistor R2, and a voltage regulator diode ZD1. The first end of the first resistor R1 is electrically connected to the first pole of the second transistor Q1. The second end of the first resistor R1 is electrically connected to the control pole of the third transistor Q11, the first end of the second resistor R2, the control pole of the fourth transistor Q12, and the first pole of the voltage regulator diode ZD1. The second end of the second resistor R2 is electrically connected to the first pole of the third transistor Q11, the first pole of the fourth transistor Q12, and the second pole of the voltage regulator diode ZD1. The second charging switch module 32 further includes a first resistor R7, a second resistor R8, and a voltage regulator diode ZD2. The first end of the first resistor R7 is electrically connected to the first pole of the second transistor Q2. The second end of the first resistor R7 is electrically connected to the control pole of the third transistor Q21, the first end of the second resistor R8, the control pole of the third transistor Q22, and the first pole of the voltage regulator diode ZD2. The second end of the second resistor R8 is electrically connected to the first pole of the third transistor Q21, the first pole of the fourth transistor Q22, and the second pole of the voltage regulator diode ZD2.

[0063] Among them, the first resistor R1 and the second resistor R2 are used for voltage division to ensure the reliable conduction of the third transistor Q11 and the fourth transistor Q12. The first resistor R7 and the second resistor R8 are used for voltage division to ensure the reliable conduction of the third transistor Q21 and the fourth transistor Q22. The voltage regulator diodes ZD1 and ZD2 are used for voltage stabilization.

[0064] Figure 5 is a schematic structural diagram of another charging interface expansion device provided by an embodiment of the present invention. Refer to Figure 5 , on the basis of the above embodiments, the charging interface expansion device further includes at least two communication switch modules. The charging input end 200 further includes a first communication end CH-COM, and the first communication end CH-COM is communicatively connected to the second communication end 120 of the control module 10. The control end of the communication switch module is electrically connected to the control module 10. The first end of the communication switch module is communicatively connected to the first communication end CH-COM. The second end of the communication switch module is electrically connected to the control module 10. Each group of charging output ends further includes a third communication end, and the second end of the communication switch module is also communicatively connected to the third communication end in a one-to-one correspondence. The control module 10 is configured to determine a target battery pack according to the voltages detected by at least two voltage detection modules, control the communication switch module corresponding to the target battery pack to conduct, and after determining that the target battery pack is in a connected state with the charger, control the charging switch module corresponding to the target battery pack to conduct.

[0065] Among them, at least two communication switch modules may exemplarily include two communication switch modules, a first communication switch module 41 and a second communication switch module 42. The control end of the first communication switch module 41 is electrically connected to the sixth terminal K1 of the control module 10. The first end of the first communication switch module 41 is communicatively connected to the first communication terminal CH-COM. The second end of the first communication switch module 41 is electrically connected to the seventh terminal 121 of the control module 10 and is communicatively connected to the third communication terminal A COM1 of the first battery pack. The control end of the second communication switch module 42 is electrically connected to the eighth terminal K2 of the control module 10. The first end of the second communication switch module 42 is communicatively connected to the first communication terminal CH-COM. The second end of the second communication switch module 42 is electrically connected to the ninth terminal 122 of the control module 10 and is communicatively connected to the third communication terminal B COM2 of the second battery pack.

[0066] Specifically, when the control module 10 distributes the first battery pack for charging according to the detected voltage, the sixth terminal K1 of the control module 10 outputs a fifth control signal. Then, after the first communication switch module 41 responds to the fifth control signal and conducts, the third communication terminal A COM1 and the first communication terminal CH-COM are in a connected state. The access state of the first battery pack is judged. Then, the control module 10 outputs a first control signal to make the first charging switch module 31 conduct to charge the first battery pack. After the charging is completed, the sixth terminal K1 of the control module 10 outputs a sixth control signal. Then, after the first communication switch module 41 responds to the sixth control signal and turns off, at the same time, the eighth terminal K2 of the control module 10 outputs a seventh control signal. Then, after the second communication switch module 42 responds to the seventh control signal and conducts, the third communication terminal B COM2 and the first communication terminal CH-COM are in a connected state. The access state of the second battery pack is judged. Then, the control module 10 outputs a third control signal to make the second charging switch module 32 conduct to charge the second battery pack.

[0067] Optionally, continue to refer to Figure 5 , the control module 10 further includes at least two fourth communication terminals, and the fourth communication terminals are communicatively connected to the third communication terminals one by one. The communication switch module includes a fifth transistor; the control electrode of the fifth transistor is electrically connected to the control module. The first electrode of the fifth transistor is electrically connected to the control module and is communicatively connected to a third communication terminal and a fourth communication terminal respectively. The second electrode of the fifth transistor is communicatively connected to the first communication terminal CH-COM and the second communication terminal 120.

[0068] Among them, the first communication switch module 41 includes a fifth transistor Q41. The control electrode of the fifth transistor Q41 is electrically connected to the sixth terminal K1 of the control module 10. The first electrode of the fifth transistor Q41 is electrically connected to the seventh terminal 121 of the control module 10 and is communicatively connected to the third communication terminal COM1 of the first battery pack. The second electrode of the fifth transistor Q41 is communicatively connected to the first communication terminal CH-COM. The second communication switch module 42 includes a fifth transistor Q42. The control electrode of the fifth transistor Q42 is electrically connected to the eighth terminal K2 of the control module 10. The first electrode of the fifth transistor Q42 is electrically connected to the ninth terminal 122 of the control module 10 and is communicatively connected to the third communication terminal COM2 of the second battery pack. The second electrode of the fifth transistor Q42 is communicatively connected to the first communication terminal CH-COM. By providing the fifth transistor Q41 and the fifth transistor Q42, and the fifth transistor Q41 and the fifth transistor Q42 having a low on-resistance, the power consumption in the switched state is low, and energy loss can be reduced. And because the static power consumption of the transistor is very low, the power consumption can be reduced.

[0069] Optionally, continuing to refer to Figure 5 , the charging interface expansion device further includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. The first end of the ninth resistor R9 and the first end of the eleventh resistor R11 are communicatively connected to the first communication terminal CH-COM. The second end of the ninth resistor R9 is electrically connected to the sixth terminal K1 of the control module 10. The second end of the eleventh resistor R11 is electrically connected to the eighth terminal K2 of the control module 10. The first end of the tenth resistor R10 is electrically connected to the seventh terminal 121 of the control module 10. The second end of the tenth resistor R10 and the second end of the twelfth resistor R12 are grounded. The first end of the twelfth resistor R12 is electrically connected to the ninth terminal 122 of the control module 10.

[0070] Among them, the ninth resistor R9 and the eleventh resistor R11 are used for current limiting and protecting the circuit, and the tenth resistor R10 and the twelfth resistor R12 are used to prevent malfunction caused by noise or interference.

[0071] It can be understood that the charging interface expansion device may include N voltage detection modules, N charging switch modules, N communication switch modules, and N groups of charging output terminals. The N voltage detection modules, N charging switch modules, and N groups of charging output terminals are in a one-to-one correspondence relationship. Exemplarily, the Nth voltage detection module 3N includes transistors QN, Q1N, Q2N, resistors R7N, R8N, and a voltage stabilizing diode ZDN. The second end of the Nth voltage detection module 3N is electrically connected to the Nth positive output terminal BATN+. The Nth voltage detection module includes transistors Q3N, resistors R2N, and R3N. The first end of the Nth voltage detection module is electrically connected to the Nth positive output terminal BATN+. The Nth communication switch module includes transistors Q4N, resistors R4N, and R5N. The first end of resistor R5N is electrically connected to the tenth terminal 12N of the control module 10 and is communicatively connected to the communication terminal COMN of the battery pack. The Nth charging output terminal includes the Nth positive output terminal BATN+ and the Nth negative output terminal BATN-.

[0072] Figure 6 It is a schematic structural diagram of another charging interface expansion device provided by an embodiment of the present invention. Refer to Figure 6 , on the basis of the above embodiments, the charging interface expansion device further includes a charging current detection module 50; the first end of the charging current detection module 50 is electrically connected to the negative input terminal CH-BAT-, the second end of the charging current detection module 50 is electrically connected to the negative output terminal, and the charging current detection module 50 is also electrically connected to the control module 10; the control module 10 is further configured to detect the charging current of the charger for the battery pack through the current detection module and control the duty cycle of the corresponding charging switch module to be reduced when the charging current is greater than a preset current threshold value.

[0073] Wherein, the preset current threshold value is the rated current for charging the battery pack. The control module 10 detects the charging current of the charger for the battery pack through the charging current detection module 50 and controls the duty cycle of the corresponding charging switch module to be reduced when the charging current is greater than the preset current threshold value, which may mean that the control module 10 detects the charging current of the charger for the battery pack through the charging current detection module 50 and controls the duty cycle of the charging switch module connected to the battery pack being charged to be reduced when the charging current is greater than the preset current threshold value.

[0074] Specifically, the charging current detection module 50 detects the magnitude of the current of the charger in real time, and converts the current into a corresponding voltage division value through the charging current detection module 50 and inputs it to the eleventh terminal 131 of the control module 10 for electrical connection. When the eleventh terminal 131 of the control module 10 determines that the magnitude of the current of the current charger is greater than the rated current of the charging battery pack through the voltage division value, a control signal is output to the control end of the charging switch module, and by adjusting the control end of the corresponding charging switch module, that is, the duty cycle of the conduction of the corresponding second transistor, current limiting is performed, thereby ensuring the normal charging of the battery pack.

[0075] In the technical solution of the embodiment of the present invention, by providing a charging current detection module, when a too high current is detected, the charging current detection module can trigger a protection mechanism, which can prevent the battery pack from having potential safety hazards due to overcurrent and then damage the battery pack or cause the battery pack to overheat during charging.

[0076] Optionally, continue to refer to Figure 6 , the charging interface expansion device further includes a power supply module 60, a first diode D1, a second diode D2, and a third diode D3. The input end of the power supply module 60 is electrically connected to the second pole of the first diode D1, the second pole of the second diode D2, and the second pole of the third diode D3. The input end of the power supply module 60 is electrically connected to the tenth terminal VDD of the control module 10. The first pole of the first diode D1 is electrically connected to the positive input terminal CH-BAT+. The second pole of the second diode D2 is electrically connected to the first positive output terminal BAT1+. The first pole of the third diode D3 is electrically connected to the Nth positive output terminal BATN+.

[0077] Among them, the first diode D1, the second diode D2, and the third diode D3 are used to make the input voltages at the input end of the power supply module 60 in an "OR" relationship. At the same time, the voltage with a larger input voltage is input to the input end of the power supply module 60.

[0078] Optionally, the embodiment of the present invention further provides a charging device, including the charging interface expansion device and the charger provided in any of the above embodiments. Therefore, the charging device also has the beneficial effects provided in any of the above embodiments.

[0079] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, which is not limited herein.

[0080] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A charging interface expansion device, characterized in that, The charging interface expansion device includes a charging input end, at least two groups of charging output ends, a control module, at least two voltage detection modules, and at least two charging switch modules; the charging input end is used to connect to a charger, and the charging output end is used to connect to a battery pack; The voltage detection module is electrically connected to the control module and one of the groups of charging output ends respectively, and is used to detect the voltage of the battery pack connected to the charging output end under the control of the control module; The charging switch module is electrically connected to the charging input end and one of the groups of charging output ends respectively, and the charging switch module is also connected to the control module; The control module is used to control the on-off state of the charging switch module according to the voltages detected by at least two of the voltage detection modules.

2. The charging interface expansion device according to claim 1, wherein The charging input end includes a positive input end and a negative input end; each group of charging output ends includes a positive output end and a negative output end; The positive output end is used to connect to the positive pole of the battery pack, and the negative output end is used to connect to the negative pole of the battery pack; The control end of the charging switch module is electrically connected to the control module, the first end of the charging switch module is electrically connected to the charging input end, and the second end of the charging switch module is electrically connected to a positive output end; The negative output end is electrically connected to the negative input end.

3. The charging interface expansion device according to claim 1 or 2, characterized in that The voltage detection module includes a first transistor and a voltage dividing unit; The first transistor and the voltage dividing unit are connected in series between the charging output end and the ground. The control electrode of the first transistor is electrically connected to the control module, and the output end of the voltage dividing unit is electrically connected to the control module; the control module is used to determine the power of the battery connected to the charging output end according to the voltage at the output end of the voltage dividing unit, and determine the charging sequence of each battery according to the power of the battery.

4. The charging interface expansion device according to claim 1, characterized in that The charging switch module includes a control unit and a switch unit; The control end of the control unit is electrically connected to the control module, the first end of the control unit is electrically connected to the control end of the switch unit, the second end of the control unit is grounded, and the control unit is used to control the on-off state of the switch unit according to the control signal output by the control module; the first end of the switch unit is electrically connected to the charging input end, and the second end of the switch unit is electrically connected to one of the groups of charging output ends.

5. The charging interface expansion device according to claim 4, characterized in that, The control unit includes a second transistor, and the switch unit includes a third transistor and a fourth transistor; The control electrode of the second transistor is connected to the control module, the first electrode of the second transistor is connected to the control electrodes of the third transistor and the fourth transistor, the second electrode of the second transistor is grounded, the second electrode of the third transistor is electrically connected to the charging input end, the first electrode of the third transistor is electrically connected to the first electrode of the fourth transistor, and the second electrode of the fourth transistor is electrically connected to the charging output end.

6. The charging interface expansion device according to claim 5, wherein It also includes a first resistor, a second resistor and a voltage stabilizing diode; The first end of the first resistor is electrically connected to the first pole of the second transistor, and the second end of the first resistor is electrically connected to the control pole of the third transistor, the first end of the second resistor, the control pole of the fourth transistor, and the first pole of the voltage regulator diode. The second end of the second resistor is electrically connected to the first pole of the third transistor, the first pole of the fourth transistor, and the second pole of the voltage regulator diode.

7. The charging interface expansion device according to claim 1 or 2, characterized in that, It further includes at least two communication switch modules. The charging input end further includes a first communication end, and the first communication end is communicatively connected to the second communication end of the control module. The control end of the communication switch module is electrically connected to the control module. The first end of the communication switch module is communicatively connected to the first communication end, and the second end of the communication switch module is electrically connected to the control module. Each set of the charging output ends further includes a third communication end, and the second end of the communication switch module is also communicatively connected to the third communication end in a one-to-one correspondence. The control module is configured to determine a target battery pack according to the voltages detected by at least two of the voltage detection modules, control the communication switch module corresponding to the target battery pack to conduct, and after determining that the target battery pack is in a connected state with the charger, control the charging switch module corresponding to the target battery pack to conduct.

8. The charging interface expansion device according to claim 7, wherein The control module further includes at least two fourth communication ends, and the fourth communication ends are communicatively connected to the third communication ends in a one-to-one correspondence. The communication switch module includes a fifth transistor. The control pole of the fifth transistor is electrically connected to the control module. The first pole of the fifth transistor is electrically connected to the control module and is respectively communicatively connected to one of the third communication ends and one of the fourth communication ends. The second pole of the fifth transistor is communicatively connected to the first communication end and the second communication end.

9. The charging interface expansion device according to claim 2, wherein It further includes a charging current detection module. The first end of the charging current detection module is electrically connected to the negative input end, the second end of the charging current detection module is electrically connected to the negative output end, and the charging current detection module is also electrically connected to the control module. The control module is further configured to detect the charging current of the charger to the battery pack through the charging current detection module, and control to reduce the duty cycle of the corresponding charging switch module when the charging current is greater than a preset current threshold.

10. A charging device, characterized in that, It includes the charging interface expansion device and the charger according to any one of claims 1-9.

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