A battery charger

Abstract

A battery charger is disclosed, which includes an interface, a battery compartment for accommodating N charging batteries, and a switch assembly. The interface includes a positive pin for connecting a positive pole of a power source and a ground pin for grounding. The battery compartment includes N charging positions, each of which includes a battery positive connection terminal and a battery negative connection terminal; the first battery negative connection terminal is connected to the ground pin, and the Nth battery positive connection terminal is connected to the positive pin. The switch assembly is for user operation, which is connected to at least part of the N battery positive connection terminals and the N battery negative connection terminals, and includes a first state and a second state. When the switch assembly is in the first state, the N battery positive connection terminals are connected in parallel, and the N battery negative connection terminals are connected in parallel; when the switch assembly is in the second state, the battery positive connection terminal of a previous charging position is connected to the battery negative connection terminal of a subsequent charging position.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging devices, in particular to a battery charger. BACKGROUND

[0002] The current battery charger can only charge the battery, and the function is relatively single.

[0003] Therefore, there is a need for a battery charger to at least partially solve the above problems. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the detailed description section. The summary section of the present application does not mean to attempt to limit the key features and essential technical features of the claimed technical solutions, nor to determine the protection scope of the claimed technical solutions.

[0005] To at least partially solve the above problems, the present application provides a battery charger, which comprises:

[0006] an interface, the interface comprising a positive pin for connecting a positive pole of a power supply and a ground pin for grounding;

[0007] a battery compartment for accommodating N charging batteries, N being a positive integer, the battery compartment comprising N charging positions respectively corresponding to the N charging batteries, each charging position being used for removably placing one of the charging batteries, each charging position comprising a battery positive connection terminal for connecting a positive pole of the charging battery and a battery negative connection terminal for connecting a negative pole of the charging battery; and

[0008] a switch assembly for user operation, the switch assembly being connected to at least part of the N battery positive connection terminals and the N battery negative connection terminals, the switch assembly comprising a first state and a second state,

[0009] wherein,

[0010] when the switch assembly is in the first state, the N battery positive connection terminals are connected in parallel to the positive pin, and the N battery negative connection terminals are connected in parallel to the ground pin;

[0011] when the switch assembly is in the second state, the battery negative connection terminal of the first charging position is connected to the ground pin, the battery positive connection terminal of the Nth charging position is connected to the positive pin, and the battery positive connection terminal of the previous charging position is connected to the battery negative connection terminal of the next charging position.

[0012] According to the application, the battery charger is provided with a switch assembly, so that the charging batteries can be connected in parallel or in series. When connected in parallel, all the charging batteries can be charged, and when connected in series, the charging batteries can be used to charge other electrical devices (such as mobile phones). Thus, the battery charger can be used as a power bank, expanding the function of the battery charger.

[0013] Optionally,

[0014] The battery negative connection terminal of the first charging position is connected to the ground pin,

[0015] The battery positive connection terminal of the Nth charging position is connected to the positive pin,

[0016] The switch assembly includes at least 2N-2 single-pole double-throw switches, the battery positive connection terminal of the first charging position, the battery negative connection terminal of the Nth charging position, and the battery positive connection terminal and the battery negative connection terminal of each of the second to the N-1th charging positions are all connected to one of the 2N-2 single-pole double-throw switches,

[0017] Wherein,

[0018] When M is an odd number, the fixed terminal of the Mth single-pole double-throw switch is connected to the battery positive connection terminal of the (M+1) / 2th charging position, the first free terminal of the Mth single-pole double-throw switch is connected to the battery positive connection terminal of the Nth charging position, and the second free terminal of the Mth single-pole double-throw switch is connected to the second free terminal of the M+1th single-pole double-throw switch;

[0019] When M is an even number, the fixed terminal of the Mth single-pole double-throw switch is connected to the battery negative connection terminal of the (M+2) / 2th charging position, the first free terminal of the Mth single-pole double-throw switch is connected to the battery negative connection terminal of the first charging position, and the second free terminal of the Mth single-pole double-throw switch is connected to the second free terminal of the M-1th single-pole double-throw switch,

[0020] Wherein, all 2N-2 single-pole double-throw switches are configured to switch the connection state of the fixed terminal and the free terminal synchronously, in the first state, the fixed terminals and the first free terminals of all 2N-2 single-pole double-throw switches are connected, and in the second state, the fixed terminals and the second free terminals of all 2N-2 single-pole double-throw switches are connected.

[0021] According to the application, by connecting the positive and negative terminals of N charging batteries to single-pole double-throw switches, and by switching the connection state of all single-pole double-throw switches, the parallel and series switching of the charging batteries is realized.

[0022] According to the application, the battery charger is connected with external devices through a Type-C interface, so that the battery charger has better universality. Optionally,

[0023] The battery charger further comprises a first indicator light and a second indicator light.

[0024] The battery charger is configured to, in a use state of the battery charger: when the switch assembly is in the first state, the first indicator light is lit, and when the switch assembly is in the second state, the second indicator light is lit.

[0025] According to the application, the first indicator light is used to indicate that the battery is in a charging state, and the second indicator light is used to indicate that the battery is in a discharging state.

[0026] Optionally,

[0027] The switch assembly further comprises a first additional single-pole double-throw switch and a second additional single-pole double-throw switch, and the first additional single-pole double-throw switch and the second additional single-pole double-throw switch are configured to synchronously switch the connection states of the fixed terminals and the free terminals of all 2N-2 single-pole double-throw switches.

[0028] The first indicator light is electrically connected with the first additional single-pole double-throw switch and the second additional single-pole double-throw switch, and the second indicator light is electrically connected with the first additional single-pole double-throw switch and the second additional single-pole double-throw switch.

[0029] According to the application, the first indicator light and the second indicator light are also controlled by single-pole double-throw switches, so that the specifications of the components of the battery charger are the same, and the control method is more integral.

[0030] Optionally,

[0031] The fixed terminal of the first additional single-pole double-throw switch is connected to the battery negative connection terminal of the first charging potential, the first free terminal of the first additional single-pole double-throw switch is connected to the first end of the first indicator light, and the second free terminal of the first additional single-pole double-throw switch is connected to the first end of the second indicator light.

[0032] The fixed terminal of the second additional single-pole double-throw switch is connected to the battery positive connection terminal of the Nth charging potential, the first free terminal of the second additional single-pole double-throw switch is connected to the second end of the first indicator light, and the second free terminal of the second additional single-pole double-throw switch is connected to the second end of the second indicator light.

[0033] According to the application, the control method of the first indicator light and the second indicator light is simple.

[0034] Optionally,

[0035] The first indicator light is configured as a first light-emitting diode, a first end of the first indicator light is a negative terminal of the first light-emitting diode, and a second end of the first indicator light is a positive terminal of the first light-emitting diode; and / or

[0036] The second indicator light is configured as a second light-emitting diode, a first end of the second indicator light is a negative terminal of the second light-emitting diode, and a second end of the second indicator light is a positive terminal of the second light-emitting diode.

[0037] According to the present application, the first indicator light and the second indicator light are low in cost and stable in performance.

[0038] Optionally, the battery charger further comprises a control chip, a first free end of the first additional single-pole double-throw switch is connected to a communication pin of the control chip, a second free end of the first additional single-pole double-throw switch is connected to a ground pin of the control chip, and a second free end of the second additional single-pole double-throw switch is connected to a power supply pin of the control chip.

[0039] According to the present application, the control chip functions in the discharging state of the battery charger. When the battery charger is used as a power bank, the N batteries in series can supply power to the control chip.

[0040] Optionally, the interface is configured as a Type-C interface, and the battery charger further comprises a control chip, a CC1 pin and a CC2 pin of the Type-C interface are connected to the control chip.

[0041] According to the present application, the battery charger communicates with external devices through the control chip.

[0042] Optionally, the battery charger further comprises a first additional single-pole double-throw switch, a fixed end of the first additional single-pole double-throw switch is connected to the control chip, one of a first free end and a second free end of the first additional single-pole double-throw switch is connected to the negative electrode connection terminal of the first charging potential, and the other of the first free end and the second free end of the first additional single-pole double-throw switch is connected to the positive electrode connection terminal of the Nth charging potential, and the first additional single-pole double-throw switch is configured to synchronously switch the connection state of the fixed end and the free end with all 2N-2 single-pole double-throw switches.

[0043] According to the present application, the control chip determines the charging or discharging state of the battery charger according to the signal of the fixed end of the first additional single-pole double-throw switch.

[0044] Optionally, the battery charger further comprises a second additional single-pole double-throw switch, a fixed terminal of the second additional single-pole double-throw switch is connected to the control chip, one of a first free terminal and a second free terminal of the second additional single-pole double-throw switch is connected to the battery positive connection terminal of the Nth charging potential, the other of the first free terminal and the second free terminal of the second additional single-pole double-throw switch is connected to the battery negative connection terminal of the first charging potential, and the second additional single-pole double-throw switch is configured to synchronously switch the connection state of the fixed terminal and the free terminal with all the 2N-2 single-pole double-throw switches.

[0045] According to the present application, the second additional single-pole double-throw switch is also used to assist the control chip to determine the working state of the charger.

[0046] Optionally,

[0047] a first terminal of the first indicator lamp is connected to the control chip, and a second terminal of the first indicator lamp is used to be connected to the positive pin and the battery positive connection terminal of the Nth charging potential; and

[0048] a first terminal of the second indicator lamp is connected to the control chip, and a second terminal of the second indicator lamp is used to be connected to the positive pin and the battery positive connection terminal of the Nth charging potential.

[0049] According to the present application, the control chip determines the charging or discharging state of the battery charger according to the signal of the fixed terminal of the first additional single-pole double-throw switch, and then controls the voltage of the voltage output pin, and correspondingly lights up the first indicator lamp or the second indicator lamp. The first indicator lamp and the second indicator lamp are powered by the positive pin of the interface and the battery positive connection terminal of the Nth charging potential.

[0050] Optionally,

[0051] the first indicator lamp is configured as a first light-emitting diode, a first terminal of the first indicator lamp is a negative terminal of the first light-emitting diode, and a second terminal of the first indicator lamp is a positive terminal of the first light-emitting diode; and / or

[0052] the second indicator lamp is configured as a second light-emitting diode, a first terminal of the second indicator lamp is a negative terminal of the second light-emitting diode, and a second terminal of the second indicator lamp is a positive terminal of the second light-emitting diode.

[0053] According to the present application, the first indicator lamp and the second indicator lamp are low in cost and stable in performance.

[0054] Optionally,

[0055] a PTC thermistor or power resistor is connected in series between the first free end of the first of the 2N-2 single-pole double-throw switches and the positive terminal of the battery of the first charging potential;

[0056] a PTC thermistor or power resistor is connected in series between the first free end of the 2N-2 single-pole double-throw switch and the negative terminal of the battery of the first charging potential;

[0057] a PTC thermistor or power resistor is connected in series between the first free end of the Mth single-pole double-throw switch of the 2N-2 single-pole double-throw switches and the negative terminal of the battery of the first charging potential, or between the first free end of the M+1 single-pole double-throw switch and the positive terminal of the battery of the Nth charging potential, where M is an even number less than 2N-2.

[0058] According to the present application, by connecting each of the charging batteries in series with a PTC thermistor or power resistor, the battery charger can control the charging current when charging the charging batteries, thereby protecting the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0059] The following drawings for the present application are hereby incorporated into this application as part of the present application for the purpose of understanding the present application. The embodiments of the present application and their description shown in the drawings are used to explain the principles of the present application.

[0060] In the drawings:

[0061] Figure 1 is a perspective exploded schematic view of a battery charger according to a preferred embodiment of the present application;

[0062] Figure 2 is Figure 1 is a partial circuit schematic view of the battery charger shown in FIG. 1, where the switch assembly is in a first state;

[0063] Figure 3 is Figure 1 is a partial circuit schematic view of the battery charger shown in FIG. 1, where the switch assembly is in a second state;

[0064] Figure 4 is Figure 1 is an exemplary circuit schematic view of the battery charger shown in FIG. 1, where the switch assembly is in a first state;

[0065] Figure 5 is Figure 1 is another exemplary circuit schematic view of the battery charger shown in FIG. 1, where the switch assembly is in a second state.

[0066] REFERENCE NUMERALS:

[0067] 10: upper cover

[0068] 20: battery compartment

[0069] 21 / 21A / 21B / 21C / 21D: charging position

[0070] 23 / 23A / 23B / 23C / 23D: positive electrode connection terminal of battery

[0071] 24 / 24A / 24B / 24C / 24D: negative electrode connection terminal of battery

[0072] 24P / 24Q: negative electrode sub-terminal

[0073] 25 / 25A / 25B / 25C / 25D: charging battery

[0074] 30: circuit board

[0075] 31: circuit

[0076] 35: button

[0077] 36: VBUS pin

[0078] 37: PTC thermistor

[0079] 371: ground pin

[0080] 38: Type-C interface

[0081] 39: control chip

[0082] 40: bottom cover

[0083] 45: button hole

[0084] 50: indicator light

[0085] 51: first indicator light

[0086] 52: second indicator light

[0087] 60: switch assembly

[0088] 62 / 62A / 62B / 62C / 62D / 62E / 62F: single-pole double-throw switch

[0089] 63 / 66C / 67C: fixed end

[0090] 64 / 66A / 67A: first free end

[0091] 65 / 66B / 67B: second free end

[0092] 66: first additional single-pole double-throw switch

[0093] 67: second additional single-pole double-throw switch

[0094] 100: battery charger DETAILED DESCRIPTION

[0095] In the following description, numerous specific details are set forth to provide a more thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present application.

[0096] For a thorough understanding of the present application, reference is made to the following detailed description. It is appreciated that the embodiments are provided for the purpose of disclosing the present application fully and completely, and to convey the full scope of the concepts of the exemplary embodiments to those skilled in the art. It is apparent that the implementation of the present application is not limited to the particular details described, since various alterations, modifications, and improvements of the particular embodiments will occur to those skilled in the art. The preferred embodiments of the present application are described in detail below.

[0097] The ordinal numbers such as "first" and "second" used in the present application are merely identifiers rather than any other meaning, for example, a particular order. Also, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". The use of the ordinal numbers "first", "second", and "third" does not indicate any order, and the ordinal numbers can be interpreted as names.

[0098] It is to be understood that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer", and similar terms are used for explanation purposes only and are not limiting.

[0099] The present application provides a battery charger.

[0100] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings.

[0101] As Figure 1 shown, in a preferred embodiment, the battery charger 100 according to the present application includes an upper cover 10, a battery compartment 20, a circuit board 30, and a bottom cover 40.

[0102] The battery compartment 20 is used to accommodate N (N is a positive integer) number of rechargeable batteries. In the illustrated embodiment, N = 4. Of course, N can also be other values, for example, 6, 8, etc. The battery compartment 20 includes N number of charging sites 21 corresponding to the N number of rechargeable batteries, respectively, each of which is used to removably place a rechargeable battery 25 (see FIG. 2).Figure 2 Each charging position 21 includes a battery positive terminal 23 for connecting the positive pole of a charging battery 25 and a battery negative terminal 24 for connecting the negative pole of the charging battery 25. It is understood that the battery positive terminal 23 is equivalent to the positive terminal of the battery 25 and the battery negative terminal 24 is equivalent to the negative terminal of the battery 25.

[0103] The charging batteries 25 are dry batteries, such as lithium rechargeable batteries.

[0104] For example, when N=4, the battery compartment 20 is provided with charging positions 21A, 21B, 21C and 21D for respectively accommodating charging batteries 25A, 25B, 25C and 25D. The charging position 21A includes a battery positive terminal 23A for connecting the positive pole of the charging battery 25A and a battery negative terminal 24A for connecting the negative pole of the charging battery 25A. The charging position 21B includes a battery positive terminal 23B for connecting the positive pole of the charging battery 25B and a battery negative terminal 24B for connecting the negative pole of the charging battery 25B. The charging position 21C includes a battery positive terminal 23C for connecting the positive pole of the charging battery 25C and a battery negative terminal 24C for connecting the negative pole of the charging battery 25C. The charging position 21D includes a battery positive terminal 23D for connecting the positive pole of the charging battery 25D and a battery negative terminal 24D for connecting the negative pole of the charging battery 25D.

[0105] Preferably, the charging positions 21 are configured to be compatible with different models of charging batteries, such as 5# batteries and 7# batteries. Since different models of batteries have different sizes, such as different lengths, the battery negative terminal 24 includes a plurality of equally-potential negative sub-terminals for respectively contacting the negative poles of different models of charging batteries, and different models of batteries share the battery positive terminal 23. As shown in Fig. 2, for example, the battery negative terminal 24A of the charging position 21A includes a first negative sub-terminal 24P and a second negative sub-terminal 24Q. The 5# batteries and the 7# batteries share the battery positive terminal 23A, the 5# batteries use the first negative sub-terminal 24P, and the 7# batteries use the second negative sub-terminal 24Q. The battery negative terminals 24B, 24C and 24D are configured in the same manner as 24A. Figure 1

[0106] The bottom cover 40 is connected to the bottom of the battery compartment 20 to form part of the housing of the battery charger 100. The circuit board 30 is located between the bottom cover 40 and the battery compartment 20 and is supported by the bottom cover 40. The circuit board 30 is provided with a circuit 31 (as shown in Fig. 3) and a plurality of charging circuits 32 (as shown in Fig. 4) for respectively charging the charging batteries 25 accommodated in the charging positions 21. Figures 2 to 5 ​The N battery positive connection terminals 23 and the N battery negative connection terminals 24 are electrically connected to or arranged on the circuit board 30, so that the N battery positive connection terminals 23 and the N battery negative connection terminals 24 also become part of the circuit 31. The upper cover 10 is used to fasten the battery compartment 20. Preferably, the upper cover 10 is detachably connected to the bottom cover 40, or the upper cover 10 is pivotally connected to the bottom cover 40, so that the upper cover 10 can be opened or closed to the charging position 21.

[0107] As shown in FIG. 1, the battery charger 100 further comprises a switch assembly 60. The switch assembly 60 is part of the circuit 31. The switch assembly 60 is used for user operation. The switch assembly 60 is connected to at least part of the N battery positive connection terminals 23 and the N battery negative connection terminals 24. The switch assembly 60 has a first state and a second state. When the switch assembly 60 is in the first state, the N battery positive connection terminals 23 are connected in parallel, and the N battery negative connection terminals 24 are connected in parallel. When the switch assembly 60 is in the second state, the battery positive connection terminal 23 of the former charging position 21 is connected to the battery negative connection terminal 24 of the latter charging position 21. Figure 2 Therefore, when the N charging batteries 25 are placed in the battery compartment 20, in the first state, the N charging batteries 25 are connected in parallel with each other, so that the battery charger 100 can charge the N charging batteries 25. In the second state, the N charging batteries 25 are connected in series, so that the battery charger 100 can charge other electrical equipment and provide a charging voltage of 1.5N volts (for example, the voltage of each battery 25 is 1.5V). That is, in the second state, the charger 100 becomes a power bank 100. Therefore, according to the technical solution of the present application, the battery charger 100 has the function of a power bank, and each charging battery 25 can be taken out from the battery compartment 20 after being fully charged to be installed on other electrical equipment to provide power for the equipment. The N charging batteries 25 can also be used to supply power to other equipment (such as a mobile phone) at the same time. Therefore, the function of the charger 100 is expanded, and the user experience is improved.

[0108] The charger 100 can be understood as a charger with the function of a power bank, or as a power bank with the function of a battery charger.

[0109] Preferably, as shown in FIG. 1, the N battery positive connection terminals 23 and the N battery negative connection terminals 24 are arranged on the circuit board 30.

[0110] Figure 1 ​As shown, a button 35 for user operation is connected to the circuit board 30. The button 35 is exposed through a button hole 45 in the bottom cover 40, making it accessible to the user. The button 35 is connected to a switch assembly 60 to control the state of the switch assembly 60. The button 35 is, for example, a self-locking button, having a first locked state and a second locked state. When the button 35 is in the first locked state, the switch assembly 60 is in the first state; when the button 35 is in the second locked state, the switch assembly 60 is in the second state. For example, when the user presses the button 35, each press switches the button 35 between the first and second locked states, and the switch assembly 60 switches between the first and second states. Thus, by pressing the button 35, the user changes the operating state of the charger 100, switching the charger 100 between charger function and power bank function.

[0111] Preferably, the charger 100 is provided with an indicator light 50 to indicate the operating status of the charger 100. The indicator light 50 is also part of the circuit 31. For example, the indicator light 50 includes a first indicator light 51 and a second indicator light 52. The charger 100 is configured such that when the switching component 60 is in a first state, the first indicator light 51 is lit and the second indicator light 52 is off, thereby the first indicator light 51 indicates that the charger 100 is in a battery charging state. The charger 100 is configured such that when the switching component 60 is in a second state, the first indicator light 51 is off and the second indicator light 52 is lit, thereby the second indicator light 52 indicates that the charger 100 is in a battery discharging (power bank) state. Preferably, the first indicator light 51 and the second indicator light 52 are different colors, making it easier for the user to distinguish them.

[0112] To achieve the parallel-to-series conversion of the aforementioned N rechargeable batteries 25, specifically, as follows: Figure 2 As shown, in circuit 31, the switching assembly 60 includes at least 2N-2 single-pole double-throw switches 62. Each single-pole double-throw switch 62 includes a stationary terminal 63, a first free terminal 64, and a second free terminal 65. The stationary terminal 63 is either connected to the first free terminal 64 or to the second free terminal 65, thus the single-pole double-throw switch 62 has two conducting states.

[0113] For example, in the illustrated embodiment, N = 4. The switching assembly 60 includes six single-pole double-throw switches 62, 62A, 62B, 62C, 62D, 62E, and 62F. The stationary end 63 of the single-pole double-throw switch 62 is the lower connection point in the figure, the first free end 64 is the upper left connection point, and the second free end 65 is the upper right connection point.

[0114] The negative terminal 24 of the first battery 21 is connected to ground, and the positive terminal 23 of the Nth battery 21 (for example, 21D) is connected to the positive pole of the power supply. The positive terminal 23 and the negative terminal 24 of the first battery 21, the positive terminal 23 and the negative terminal 24 of the Nth battery 21, and the positive terminal 23 and the negative terminal 24 of each of the second to the (N-1)th batteries 21 are connected to one of the 2N-2 single-pole double-throw switches 62.

[0115] For example, the negative terminal 24A of the first battery 25A is connected to ground. The positive terminal 23D of the fourth battery 25D is connected to the positive pole of the power supply. The positive terminal 24A of the first battery 25A, the negative terminal 213D of the fourth battery 25D, the negative terminal 24B and the positive terminal 23B of the second battery 25B, and the negative terminal 24C and the positive terminal 23C of the third battery 25C are sequentially connected to one of the 6 single-pole double-throw switches 62A, 62B, 62C, 62D, 62E, and 62F. Specifically, the positive terminal 23A of the first battery 25A is connected to the first single-pole double-throw switch 62A, the negative terminal 24B of the second battery 25B is connected to the second single-pole double-throw switch 62B, the positive terminal 23B of the second battery 25B is connected to the third single-pole double-throw switch 62C, the negative terminal 24C of the third battery 25C is connected to the fourth single-pole double-throw switch 62D, the positive terminal 23C of the third battery 25C is connected to the fifth single-pole double-throw switch 62E, and the negative terminal 24D of the fourth battery 25D is connected to the sixth single-pole double-throw switch 62F.

[0116] wherein, when M is an odd number, the fixed terminal 63 of the Mth single-pole double-throw switch 62 is connected to the positive terminal 23 of the (M+1) / 2th battery 21, the first free terminal 64 of the Mth single-pole double-throw switch 62 is connected to the positive terminal 23 of the Nth battery 21 (i.e., for connection to the positive pole of the power supply), and the second free terminal 65 of the Mth single-pole double-throw switch 62 is connected to the second free terminal 65 of the (M+1)th single-pole double-throw switch 62; when M is an even number, the fixed terminal 63 of the Mth single-pole double-throw switch 62 is connected to the negative terminal 24 of the (M+2) / 2th battery 21, the first free terminal 64 of the Mth single-pole double-throw switch 62 is connected to ground, and the second free terminal 65 of the Mth single-pole double-throw switch 62 is connected to the second free terminal 65 of the (M-1)th single-pole double-throw switch 62.

[0117] For example, when M is 1, the fixed terminal of the first single-pole double-throw switch 62A is connected to the positive terminal 23A of the first battery 25A, the first free terminal of the first single-pole double-throw switch 62A is connected to the battery positive connection terminal 23 of the Nth charging level 21, and the second free terminal of the first single-pole double-throw switch 62A is connected to the second free terminal of the second single-pole double-throw switch 62B.

[0118] When M is 2, the fixed terminal of the second single-pole double-throw switch 62B is connected to the negative terminal 24B of the second battery 25B, the first free terminal of the second single-pole double-throw switch 62B is connected to ground, and the second free terminal of the second single-pole double-throw switch 62B is connected to the second free terminal of the first single-pole double-throw switch 62A.

[0119] When M is 3, the fixed terminal of the third single-pole double-throw switch 62C is connected to the positive terminal 23B of the second battery 25B, the first free terminal of the third single-pole double-throw switch 62C is connected to the battery positive connection terminal 23 of the Nth charging level 21, and the second free terminal of the third single-pole double-throw switch 62C is connected to the second free terminal of the fourth single-pole double-throw switch 62D.

[0120] When M is 4, the fixed terminal of the fourth single-pole double-throw switch 62D is connected to the negative terminal 24C of the third battery 25C, the first free terminal of the fourth single-pole double-throw switch 62D is connected to ground, and the second free terminal of the fourth single-pole double-throw switch 62D is connected to the second free terminal of the third single-pole double-throw switch 62C.

[0121] When M is 5, the fixed terminal of the fifth single-pole double-throw switch 62E is connected to the positive terminal 23C of the third battery 25C, the first free terminal of the fifth single-pole double-throw switch 62E is connected to the battery positive connection terminal 23 of the Nth charging level 21, and the second free terminal of the fifth single-pole double-throw switch 62E is connected to the second free terminal of the sixth single-pole double-throw switch 62F.

[0122] When M is 6, the fixed terminal of the sixth single-pole double-throw switch 62F is connected to the negative terminal 24C of the fourth battery 25C, the first free terminal of the sixth single-pole double-throw switch 62F is connected to ground, and the second free terminal of the sixth single-pole double-throw switch 62F is connected to the second free terminal of the fifth single-pole double-throw switch 62E.

[0123] All 2N-2 single-pole double-throw switches 62 are configured to synchronously switch the connection state of the fixed terminal 63 and the free terminals (the first free terminal 64 and the second free terminal 65). In a first state, the fixed terminals 63 of all 2N-2 single-pole double-throw switches 62 are connected to the first free terminals 64, and in a second state, the fixed terminals 63 of all 2N-2 single-pole double-throw switches 62 are connected to the second free terminals 65.

[0124] For example, all the 6 single-pole double-throw switches 62 are configured to synchronously switch the connection state of the fixed terminal 63 and the free terminal (the first free terminal 64 and the second free terminal 65). As shown in FIG. 6, in the first state, the fixed terminals 63 of all the 6 single-pole double-throw switches 62 are connected with the first free terminals 64 (the connection points of the lower parts of all the single-pole double-throw switches 62 are connected with the connection points in the upper left), so that the four batteries 25A, 25B, 25C and 25D are connected in parallel with each other (the negative poles of all the four batteries are grounded, and the positive poles are connected with the positive pole of the power supply); as shown in FIG. 7, in the second state, the fixed terminals 63 of all the 2N-2 single-pole double-throw switches 62 are connected with the second free terminals 65 (the connection points of the lower parts of all the single-pole double-throw switches 62 are connected with the connection points in the upper right), so that the four batteries are connected in series (the negative pole of the first battery 25A is grounded, and the positive pole of the fourth battery 25D is connected with the positive pole of the power supply). Figure 2 Figure 3

[0125] Preferably, the battery charger 100 further comprises a Type-C interface 38, which is an interface for the battery charger 100 to connect with external devices (a charging power supply or a power consumption device). The VBUS pin 36 of the Type-C interface 38 is used to connect with the positive pole of the power supply. When the battery charger 100 is used as a charger, the VBUS pin 36 is connected with the positive pole of the external power supply to introduce charging current into the charger 100. When the battery charger 100 is used as a power bank, the four batteries connected in series become the power supply, and the VBUS pin 36 is connected with the positive pole of the fourth battery 25D to output charging current to the external power consumption device, so the VBUS pin 36 is also connected with the positive pole of the power supply. The VBUS pin 36 is also called the positive pole pin.

[0126] The battery positive pole connection terminal 23 of the Nth charging position 21 is used to connect with the VBUS pin 36. In the present application, connecting with the positive pole of the power supply means connecting with the VBUS pin 36, or connecting with the battery positive pole connection terminal 23 of the Nth charging position 21.

[0127] The Type-C interface 38 also has a ground pin 371, which is used for grounding. The battery negative pole connection terminal 24A of the first charging position 21A is connected with the ground pin 371. In the present application, grounding means connecting with the ground pin 371, or connecting with the battery negative pole connection terminal 24A of the first charging position 21A.

[0128] As shown in FIG. 6 and FIG. 7, the battery charger 100 is connected with the external power supply through the Type-C interface 38. The battery charger 100 is connected with the external power consumption device through the Type-C interface 38. Figure 4 Figure 5 ​​​As shown, in order to control the charging or discharging mode of the Type-C interface 38, that is, to make the battery charger 100 stably in the slave position or the host position, the circuit 31 is provided with a control chip 39, which controls the state of each pin of the Type-C interface 38 according to the state of the switch assembly 60.

[0129] In order to control the first indicator light 51 and the second indicator light 52 accordingly, as shown in Figure 4 and Figure 5 As shown, the switch assembly 60 further includes a first additional single-pole double-throw switch 66 and a second additional single-pole double-throw switch 67. The first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67 are configured to synchronously switch the connection state of the fixed terminal and the free terminal with all 2N-2 single-pole double-throw switches 62. That is, when the fixed terminal 63 of the single-pole double-throw switch 62 is connected with the first free terminal 64, the fixed terminal 66C of the first additional single-pole double-throw switch 66 is connected with the first free terminal 66A thereof, and the fixed terminal 67C of the second additional single-pole double-throw switch 67 is connected with the first free terminal 67A thereof; when the fixed terminal 63 of the single-pole double-throw switch 62 is connected with the second free terminal 65, the fixed terminal 66C of the first additional single-pole double-throw switch 66 is connected with the second free terminal 66B thereof, and the fixed terminal 67C of the second additional single-pole double-throw switch 67 is connected with the second free terminal 67B thereof. The first indicator light 51 is electrically connected with both the first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67, and the second indicator light 52 is also electrically connected with both the first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67, so that in the use state of the battery charger 100: when the switch assembly 60 is in the first state, the first indicator light 51 is lit and the second indicator light 52 is extinguished; when the switch assembly 60 is in the second state, the second indicator light 52 is lit and the first indicator light 51 is extinguished.

[0130] Preferably, the first indicator light 51 is configured as a first light-emitting diode. The first end of the first indicator light 51 is the negative terminal of the first light-emitting diode, and the second end of the first indicator light 51 is the positive terminal of the first light-emitting diode. Preferably, the second indicator light 52 is configured as a second light-emitting diode. The first end of the second indicator light 52 is the negative terminal of the second light-emitting diode, and the second end of the second indicator light 52 is the positive terminal of the second light-emitting diode.

[0131] In Figure 4In the illustrated embodiment, the control chip 39 is, for example, a single-chip microcomputer. The fixed terminal 66C of the first additional single-pole double-throw switch 66 is connected to the control chip 39 (for example, one I / O pin of the control chip 39, specifically, a voltage input pin, see the electrical position C in the figure). One of the first free terminal 66A and the second free terminal 66B of the first additional single-pole double-throw switch 66 is used for grounding. The other of the first free terminal 66A and the second free terminal 66B of the first additional single-pole double-throw switch 66 is connected to the battery positive connection terminal 23 of the Nth charging level 21, that is, the positive terminal of the Nth battery, for example, the positive terminal of the fourth battery 25D, that is, the power supply positive, for example, the VBUS pin 36. The fixed terminal 67C of the second additional single-pole double-throw switch 67 is connected to the control chip 39 (for example, one I / O pin of the control chip 39, specifically, a voltage input pin, see the electrical position D in the figure). One of the first free terminal 67A and the second free terminal 67B of the second additional single-pole double-throw switch 67 is used for grounding. The other of the first free terminal 67A and the second free terminal 67B of the second additional single-pole double-throw switch 67 is connected to the battery positive connection terminal 23 of the Nth charging level 21.

[0132] For example, as shown in the figure, the first free terminal 66A of the first additional single-pole double-throw switch 66 is used for grounding. The second free terminal 66B of the first additional single-pole double-throw switch 66 is connected to the battery positive connection terminal 23 of the Nth charging level 21. The first free terminal 67A of the second additional single-pole double-throw switch 67 is used for connection to the power supply positive. The second free terminal 67B of the second additional single-pole double-throw switch 67 is used for grounding. Figure 4 The first end (negative) of the first indicator light 51 (first light-emitting diode) is connected to the control chip 39 (for example, one I / O pin of the control chip 39, specifically, a voltage output pin), and the second end (positive) of the first indicator light 51 is used for connection to the power supply positive. The first end (negative) of the second indicator light 52 (second light-emitting diode) is connected to the control chip 39 (for example, one I / O pin of the control chip 39, specifically, a voltage output pin), and the second end (positive) of the second indicator light 52 is used for connection to the power supply positive.

[0133] When the fixed terminals of all the single-pole double-throw switches 62 are connected with the first free terminals, the first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67 are also in the state that the fixed terminals are connected with the first free terminals; when the fixed terminals of all the single-pole double-throw switches 62 are connected with the second free terminals, the first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67 are also in the state that the fixed terminals are connected with the second free terminals. That is, the first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67 follow the switch state of the switch assembly 60.

[0134]

[0135] ​Thus, when the switch assembly 60 is in the first state, the first additional single-pole double-throw switch 66 is connected to the ground, transmitting a low-level signal to the control chip 39, and the second additional single-pole double-throw switch 67 is connected to the positive pole of the power supply, transmitting a high-level signal to the control chip 39. This makes the control chip 39 determine that the switch assembly 60 is in the first state, and the charger 100 is in the charging (slave) state, so that a low voltage is output to the negative pole of the first indicator lamp 51 to make the first indicator lamp 51 light up, and a high voltage is output to the negative pole of the second indicator lamp 52 to make the second indicator lamp 52 unable to light up. When the switch assembly 60 is in the second state, the first additional single-pole double-throw switch 66 is connected to the positive pole of the power supply, transmitting a high-level signal to the control chip 39, and the second additional single-pole double-throw switch 67 is connected to the ground, transmitting a low-level signal to the control chip 39. This makes the control chip 39 determine that the switch assembly 60 is in the second state, and the charger 100 is in the discharging (master) state, so that a high voltage is output to the negative pole of the first indicator lamp 51 to make the first indicator lamp 51 unable to light up, and a low voltage is output to the negative pole of the second indicator lamp 52 to make the second indicator lamp 52 light up.

[0136] It can be understood that, in the embodiment shown, Figure 4 In the embodiment shown, only one of the first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67 can be used to send the working state signal of the charger 100 to the control chip 39. Preferably, both the first additional single-pole double-throw switch 66 and the second additional single-pole double-throw switch 67 are used to ensure that the control chip 39 can correctly identify the working state (first state or second state) of the charger 100 when one of them fails.

[0137] In the embodiment shown, Figure 4 The control chip 39 is configured as a single-chip microcomputer, for example. The control chip 39 is powered by the positive pole of the power supply. In the first state, the control chip 39, the first indicator lamp 51 and the second indicator lamp 52 are all powered by the VBUS pin 36. In the second state, the control chip 39, the first indicator lamp 51 and the second indicator lamp 52 are all powered by the positive pole connection terminal 23 of the Nth charging position 21. The control chip 39 works in both the first state and the second state.

[0138] In the embodiment shown, Figure 4In the shown embodiment, the first free end 66A of the first additional single pole double throw switch 66 is connected to the negative pole of the first battery 25A, so that the negative pole connection terminal 24A of the first charging position 21A is connected to the first additional single pole double throw switch 66, i.e. to the switch assembly 60. The first free end 67A of the second additional single pole double throw switch 67 is connected to the positive pole of the Nth battery, so that the positive pole connection terminal 23 of the Nth charging position 21 is connected to the second additional single pole double throw switch 67, i.e. to the switch assembly 60. Thus, the switch assembly 60 is connected to all N battery positive pole connection terminals 23 and N battery negative pole connection terminals 24.

[0139] In Figure 5 In the shown embodiment, the control chip 39 is configured as a UC2606 chip, for example. The fixed end 66C of the first additional single pole double throw switch 66 is connected to ground, the first free end 66A of the first additional single pole double throw switch 66 is connected to a first end of the first indicator light 51, and the second free end 66B of the first additional single pole double throw switch 66 is connected to a first end of the second indicator light 52. The fixed end 67C of the second additional single pole double throw switch 67 is connected to the positive pole of the power supply (i.e. the positive pole of the Nth battery, e.g. the VBUS pin 36), the first free end 67A of the second additional single pole double throw switch 67 is connected to a second end of the first indicator light 51 (see the electrical position A in the figure), and the second free end 67B of the second additional single pole double throw switch 67 is connected to a second end of the second indicator light 52 (see the electrical position B in the figure).

[0140] When the switch assembly 60 is in the first state, the negative pole of the first indicator light 51 is connected to ground through the first additional single pole double throw switch 66, and the positive pole of the first indicator light 51 is connected to the positive pole of the power supply through the second additional single pole double throw switch 67, so that the first indicator light 51 is lit. At this time, the circuit connected to the second indicator light 52 is open (the second free end 67B of the second additional single pole double throw switch 67 is open), and the second indicator light 52 cannot be lit. When the switch assembly 60 is in the second state, the negative pole of the second indicator light 52 is connected to ground through the first additional single pole double throw switch 66, and the positive pole of the second indicator light 52 is connected to the positive pole of the power supply through the second additional single pole double throw switch 67, so that the second indicator light 52 is lit. At this time, the circuit connected to the first indicator light 51 is open (the first free end 67A of the second additional single pole double throw switch 67 is open), and the first indicator light 51 cannot be lit.

[0141] In Figure 5In the illustrated embodiment, the first free end 66A of the first additional single pole double throw switch 66 is also connected to the CC1 pin and the CC2 pin of the control chip 39. The CC1 pin and the CC2 pin are communication pins of the control chip 39. The second free end 66B of the first additional single pole double throw switch is connected to the ground pin of the control chip 39. The second free end 67B of the second additional single pole double throw switch 67 is connected to the VCC power pin of the control chip 39. Thus, when the charger 100 is used as a power bank, the N series of batteries can supply power to the control chip 39. That is, in the second state, the control chip 39 is powered, so the control chip 39 only works in the second state and does not work in the first state.

[0142] In Figure 5 In the illustrated embodiment, the fixed end 66C of the first additional single pole double throw switch 66 is connected to the negative electrode of the first battery 25A, so that the negative electrode connection terminal 24A of the first charging position 21A is connected to the first additional single pole double throw switch 66, that is, to the switch assembly 60. The fixed end 67C of the second additional single pole double throw switch 67 is connected to the positive electrode of the Nth battery, so that the positive electrode connection terminal 23 of the Nth charging position 21 is connected to the second additional single pole double throw switch 67, that is, to the switch assembly 60. Thus, the switch assembly 60 is connected to all N positive electrode connection terminals 23 and N negative electrode connection terminals 24.

[0143] In this application, the key 35 realizes the synchronous switching of the switching states of all 2N-2 single pole double throw switches 62, the first additional single pole double throw switch 66 and the second additional single pole double throw switch 67.

[0144] In order to make the charging battery 25 safe during charging, the charger 100 also has a charging safety guarantee measure for limiting the charging current. Specifically, the charger 100 uses a PTC (Positive Temperature Coefficient) thermistor 37 to limit the charging current. The resistance value of the PTC thermistor 37 increases with the increase of temperature, and when the charging current increases, the PTC thermistor 37 generates more heat, the temperature rises, and the resistance value increases. When the external charging voltage is constant, the charging current is reduced.

[0145] As mentioned above, when the switch assembly 60 is in the first state, the charger 100 is used as a battery charger. In the charging state, the fixed end 63 of the single pole double throw switch 62 is connected to the first free end 64. Therefore, the PTC thermistor 37 is connected to the first free end 64 of the single pole double throw switch 62 to be connected in the circuit 31 in the charging state.

[0146] Preferably, the circuit 31 is configured with N PTC thermistors 37 corresponding to the N battery cells 25 respectively, so that each battery cell 25 is connected in series with a PTC thermistor 37 to form a loop during charging.

[0147] Among them, the first battery cell 25 and the Nth battery cell 25 are only connected with one single-pole double-throw switch 62, so the first free end of the first single-pole double-throw switch 62 (the single-pole double-throw switch 62A connected to the first battery cell 25A) is provided (in series) with a PTC thermistor 37 between the positive electrode of the power supply and the ground, and the first free end of the 2N-2 single-pole double-throw switch 62 (the single-pole double-throw switch 62 connected to the Nth battery cell 25) is provided (in series) with a PTC thermistor 37 between the ground and the ground.

[0148] The positive and negative electrodes of the second to N-1 battery cells 25 are connected with single-pole double-throw switches 62, so for the second to N-1 battery cells 25, the PTC thermistor 37 can be connected to the single-pole double-throw switch 62 of the positive electrode or the single-pole double-throw switch 62 of the negative electrode. Therefore, the first free end of the Mth single-pole double-throw switch 62 among all 2N-2 single-pole double-throw switches 62 is provided (in series) with a PTC thermistor 37 between the ground and the ground; or the first free end of the M+1 single-pole double-throw switch 62 is provided (in series) with a PTC thermistor 37 between the positive electrode of the power supply and the ground. Wherein M is an even number less than 2N-2.

[0149] In the illustrated embodiment, see Figure 4 and Figure 5 When M = 2, the 2nd single-pole double-throw switch 62B is connected to the negative electrode of the second battery cell 25B, and the 3rd single-pole double-throw switch 62C is connected to the positive electrode of the second battery cell 25B. The PTC thermistor 37 can be provided (as shown in Figure 4 ) between the first free end of the 2nd single-pole double-throw switch 62B and the ground, or the PTC thermistor 37 can be provided (as shown in Figure 5 ) between the first free end of the 3rd single-pole double-throw switch 62C and the positive electrode of the power supply. When M = 4, the 4th single-pole double-throw switch 62D is connected to the negative electrode of the third battery cell 25C, and the 5th single-pole double-throw switch 62E is connected to the positive electrode of the third battery cell 25C. The PTC thermistor 37 can be provided (as shown in Figure 4 ) between the first free end of the 4th single-pole double-throw switch 62D and the ground, or the PTC thermistor 37 can be provided (as shown in Figure 5 ) between the first free end of the 5th single-pole double-throw switch 62E and the positive electrode of the power supply.

[0150] Each of the above-mentioned PTC thermistors 37 can also be replaced by a power resistor, which also functions to limit the current to the battery 25 and the circuit 31.

[0151] The battery charger according to the present application can be used as a power bank, which increases the function of the battery charger and improves the user experience.

[0152] The processes and steps described in all the preferred embodiments above are merely examples. Unless an adverse effect occurs, various processing operations can be performed in a different order from the above-described processes. The order of the steps of the above-described processes can also be added, combined, or deleted as needed.

[0153] In understanding the scope of the present application, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of the stated features, elements, components, groups, integers, and / or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and / or steps. The foregoing also applies to words having similar meanings, such as the terms "including," "having" and "containing" and their derivatives.

[0154] The term "attached" or "attach" as used herein includes a configuration in which an element is directly fixed to another element by fixing the element to the other element, a configuration in which an element is indirectly fixed to another element by fixing the element to an intermediate member which is in turn fixed to the other element, and a configuration in which one element is integral with another element, i.e., one element is essentially a part of the other element. The definition also applies to words having similar meanings, such as "connected," "coupled," "joined," "adhered," "fixed," and their derivatives. Finally, degree terms such as "substantially," "approximately," and "about" as used herein mean an amount that does not significantly change the end result.

[0155] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The features described herein in one embodiment can be applied to another embodiment, either singly or in combination, unless the features are not applicable or are otherwise contraindicated. Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The features described herein in one embodiment can be applied to another embodiment, either singly or in combination, unless the features are not applicable or are otherwise contraindicated.

[0156] The present application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the described embodiments. Furthermore, those skilled in the art can understand that the present application is not limited to the above embodiments, and that more various modifications and changes can be made according to the teachings of the present application, which all fall within the scope of the present application.

Claims

1. A battery charger characterized by comprising: comprises: an interface comprising a positive terminal for connecting a positive pole of a power supply and a ground terminal for grounding; a battery compartment for accommodating N rechargeable batteries, N being a positive integer, the battery compartment comprising N battery positions corresponding to the N rechargeable batteries respectively, each battery position for removably placing one of the rechargeable batteries, each battery position comprising a battery positive terminal for connecting a positive pole of the rechargeable battery and a battery negative terminal for connecting a negative pole of the rechargeable battery; and a switch assembly for user operation, the switch assembly being connected to at least part of the N battery positive terminals and the N battery negative terminals, the switch assembly comprising a first state and a second state, wherein, when the switch assembly is in the first state, the N battery positive terminals are connected in parallel to the positive terminal and the N battery negative terminals are connected in parallel to the ground terminal; when the switch assembly is in the second state, the battery negative terminal of the first battery position is connected to the ground terminal, the battery positive terminal of the Nth battery position is connected to the positive terminal, and the battery positive terminal of a previous battery position is connected to the battery negative terminal of a next battery position; wherein, the battery negative terminal of the first battery position is connected to the ground terminal, the battery positive terminal of the Nth battery position is connected to the positive terminal, the switch assembly comprises at least 2N-2 single-pole double-throw switches, the battery positive terminal of the first battery position, the battery negative terminal of the Nth battery position, and the battery positive terminal and the battery negative terminal of each of the second to the N-1th battery positions are connected to one of the 2N-2 single-pole double-throw switches, wherein, when M is odd, the fixed terminal of the Mth single-pole double-throw switch is connected to the battery positive terminal of the (M+1) / 2th battery position, the first free terminal of the Mth single-pole double-throw switch is connected to the battery positive terminal of the Nth battery position, and the second free terminal of the Mth single-pole double-throw switch is connected to the second free terminal of the M+1th single-pole double-throw switch; when M is even, the fixed terminal of the Mth single-pole double-throw switch is connected to the battery negative terminal of the (M+2) / 2th battery position, the first free terminal of the Mth single-pole double-throw switch is connected to the battery negative terminal of the first battery position, and the second free terminal of the Mth single-pole double-throw switch is connected to the second free terminal of the M-1th single-pole double-throw switch, wherein, all the 2N-2 single-pole double-throw switches are configured to synchronously switch the connection state of the fixed terminal and the free terminal, in the first state, the fixed terminals and the first free terminals of all the 2N-2 single-pole double-throw switches are connected, and in the second state, the fixed terminals and the second free terminals of all the 2N-2 single-pole double-throw switches are connected.

2. The battery charger according to claim 1, wherein, The battery charger further comprises a first indicator light and a second indicator light; The battery charger is configured to, in a use state of the battery charger: when the switch assembly is in the first state, the first indicator light is lit, and when the switch assembly is in the second state, the second indicator light is lit.

3. The battery charger of claim 2, wherein, The switch assembly further comprises a first additional single-pole double-throw switch and a second additional single-pole double-throw switch, and the first additional single-pole double-throw switch and the second additional single-pole double-throw switch are configured to synchronously switch the connection states of the fixed terminals and the free terminals of all 2N-2 single-pole double-throw switches; The first indicator light is electrically connected to the first additional single-pole double-throw switch and the second additional single-pole double-throw switch, and the second indicator light is electrically connected to the first additional single-pole double-throw switch and the second additional single-pole double-throw switch.

4. The battery charger of claim 3, wherein, The fixed terminal of the first additional single-pole double-throw switch is connected to the battery negative connection terminal of the first charging position, the first free terminal of the first additional single-pole double-throw switch is connected to the first end of the first indicator light, and the second free terminal of the first additional single-pole double-throw switch is connected to the first end of the second indicator light, The fixed terminal of the second additional single-pole double-throw switch is connected to the battery positive connection terminal of the Nth charging position, the first free terminal of the second additional single-pole double-throw switch is connected to the second end of the first indicator light, and the second free terminal of the second additional single-pole double-throw switch is connected to the second end of the second indicator light.

5. The battery charger of claim 4, wherein, The first indicator light is configured as a first light-emitting diode, the first end of the first indicator light is a negative terminal of the first light-emitting diode, and the second end of the first indicator light is a positive terminal of the first light-emitting diode; and / or The second indicator light is configured as a second light-emitting diode, the first end of the second indicator light is a negative terminal of the second light-emitting diode, and the second end of the second indicator light is a positive terminal of the second light-emitting diode.

6. The battery charger of claim 4, wherein, The battery charger further comprises a control chip, the first free terminal of the first additional single-pole double-throw switch is connected to a communication pin of the control chip, the second free terminal of the first additional single-pole double-throw switch is connected to a ground pin of the control chip, and the second free terminal of the second additional single-pole double-throw switch is connected to a power supply pin of the control chip.

7. The battery charger of claim 2, wherein, The interface is configured as a Type-C interface, The battery charger further comprises a control chip, and the CC1 pin and the CC2 pin of the Type-C interface are connected to the control chip.

8. The battery charger of claim 7, wherein, The battery charger further comprises a first additional single-pole double-throw switch, a fixed terminal of the first additional single-pole double-throw switch is connected to the control chip, one of first and second free terminals of the first additional single-pole double-throw switch is connected to the battery negative connection terminal of the first charging potential, and the other of the first and second free terminals of the first additional single-pole double-throw switch is connected to the battery positive connection terminal of the Nth charging potential, and the first additional single-pole double-throw switch is configured to synchronously switch the connection state of the fixed terminal and the free terminal with all 2N-2 single-pole double-throw switches.

9. The battery charger of claim 8, wherein, The battery charger further comprises a second additional single-pole double-throw switch, a fixed terminal of the second additional single-pole double-throw switch is connected to the control chip, one of first and second free terminals of the second additional single-pole double-throw switch is connected to the battery positive connection terminal of the Nth charging potential, and the other of the first and second free terminals of the second additional single-pole double-throw switch is connected to the battery negative connection terminal of the first charging potential, and the second additional single-pole double-throw switch is configured to synchronously switch the connection state of the fixed terminal and the free terminal with all 2N-2 single-pole double-throw switches.

10. The battery charger according to claim 9, wherein a first end of the first indicator lamp is connected to the control chip, and a second end of the first indicator lamp is used to be connected to the positive pin and the battery positive connection terminal of the Nth charging potential; and a first end of the second indicator lamp is connected to the control chip, and a second end of the second indicator lamp is used to be connected to the positive pin and the battery positive connection terminal of the Nth charging potential.

11. The battery charger according to claim 10, wherein the first indicator lamp is configured as a first light-emitting diode, the first end of the first indicator lamp is a negative terminal of the first light-emitting diode, and the second end of the first indicator lamp is a positive terminal of the first light-emitting diode; and / or the second indicator lamp is configured as a second light-emitting diode, the first end of the second indicator lamp is a negative terminal of the second light-emitting diode, and the second end of the second indicator lamp is a positive terminal of the second light-emitting diode.

12. The battery charger of any one of claims 1 to 11, wherein, a PTC thermistor or a power resistor is connected in series between the first free terminal of the first single-pole double-throw switch of the 2N-2 single-pole double-throw switches and the battery positive connection terminal of the Nth charging potential; a PTC thermistor or a power resistor is connected in series between the first free terminal of the 2N-2 single-pole double-throw switch of the 2N-2 single-pole double-throw switches and the battery negative connection terminal of the first charging potential; A PTC thermistor or power resistor is connected in series between the first free end of the Mth single-pole double-throw switch of the total 2N-2 single-pole double-throw switches and the negative electrode connecting terminal of the first charging potential, or a PTC thermistor or power resistor is connected in series between the first free end of the M+1th single-pole double-throw switch and the positive electrode connecting terminal of the Nth charging potential, wherein M is an even number less than 2N-2.

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