Dual voltage battery pack

Abstract

The utility model discloses a dual-voltage battery pack, which is used for being connected with a first electric tool or a second electric tool, and comprises a shell which is provided with a combination part, the combination part is provided with a voltage output part, and the voltage output part is only provided with a total positive output end and a total negative output end for outputting voltage to the outside; the first battery pack is formed by connecting a plurality of battery cells in series and is provided with a first positive electrode and a first negative electrode; the second battery pack is formed by connecting a plurality of battery cells in series and is provided with a second positive electrode and a second negative electrode; a holder housed in the case and supporting the first battery pack and the second battery pack; the switching structure is provided with a first position and a second position; when the switching structure is in the first position, the first battery pack and the second battery pack are connected in parallel, and the dual-voltage battery pack outputs a first voltage; when the switching structure is located at the second position, the first battery pack and the second battery pack are connected in series, the double-voltage battery pack outputs the second voltage, different voltages of the double-voltage battery pack can be achieved through manual switching of the switching structure, and universality is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery packs, and particularly relates to a dual-voltage battery pack. BACKGROUND

[0002] A battery pack refers to a battery system in which a plurality of battery monomers are connected in parallel or in series, and auxiliary components such as a battery management system and a cooling system are provided to meet the requirements of specific applications. In the field of electric vehicles, the battery pack serves as the power source of the electric vehicle, directly affecting the cruising range and acceleration performance of the electric vehicle; in electric tools such as electric drills and lawn mowers, the battery pack can provide a portable power source, increasing the flexibility and convenience of the electric tools.

[0003] With the increasing popularity of lithium electric tools, the demand for battery packs is also expanding. In order to meet the needs of machines in different working conditions, battery packs of different voltage platforms are generally produced in 20V and 40V platforms. However, the current 20V battery pack can only output 20V voltage, and the 40V battery pack can only output 40V voltage. When multiple voltage platforms are implemented, the platform of the battery pack needs to be different, resulting in that the battery packs of different platforms are not universal and have poor universality.

[0004] The information disclosed in this section of the background art is only intended to increase the understanding of the overall background of the application and should not be considered as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. CONTENT OF THE INVENTION

[0005] The purpose of the application is to provide a dual-voltage battery pack which can realize the switching of 20V and 40V voltages through manual switching.

[0006] In order to achieve the above purpose, the technical scheme provided by an embodiment of the application is as follows:

[0007] A dual-voltage battery pack is used to connect with a first electric tool or a second electric tool, the first electric tool and the second electric tool have a battery connecting part, and the battery connecting part is provided with a lock groove; comprising:

[0008] A housing has a combination part, the combination part has a voltage output part, and the voltage output part only has a total positive output end and a total negative output end for outputting voltage externally;

[0009] A guide rail is arranged on the combination part;

[0010] A locking member is arranged on the combination part, and when the combination part is combined with the battery connecting part, the locking member is engaged with the lock groove;

[0011] An operating member is connected to the locking member;

[0012] a biasing member, which is deformed when the operating member moves the locking member and has a tendency to return the locking member to its original position;

[0013] a first battery pack composed of a plurality of battery cells connected in series and having a first positive electrode and a first negative electrode;

[0014] a second battery pack composed of a plurality of battery cells connected in series and having a second positive electrode and a second negative electrode;

[0015] a bracket accommodated in the housing and supporting the first and second battery packs; and

[0016] a switching structure having a first position and a second position;

[0017] when the switching structure is in the first position, the first and second battery packs are connected in parallel, the dual-voltage battery pack can be connected to the first power tool and output a first voltage to the first power tool; when the switching structure is in the second position, the first and second battery packs are connected in series, the dual-voltage battery pack can be connected to the second power tool and output a second voltage to the second power tool; and the switching of the switching structure between the first and second positions is independent of the first and / or second power tool.

[0018] In one or more embodiments of the present application, the switching structure includes a first positive terminal, a first negative terminal, a second positive terminal, a second negative terminal, and a switching member, the first positive terminal is connected to the first positive electrode, the first negative terminal is connected to the first negative electrode, the second positive terminal is connected to the second positive electrode, the second negative terminal is connected to the second negative electrode, when the switching member is in the first position, the first positive terminal is electrically connected to the second positive terminal, and the first negative terminal is electrically connected to the second negative terminal, at this time, the total positive output terminal is connected to the first positive terminal or the second positive terminal, and the total negative output terminal is connected to the first negative terminal or the second negative terminal.

[0019] In one or more embodiments of the present application, the first positive terminal, the first negative terminal, the second positive terminal, and the second negative terminal are clip-type terminals, one side of the switching member has a first positive pin, a first negative pin, a second positive pin, and a second negative pin corresponding to the first positive terminal, the first negative terminal, the second positive terminal, and the second negative terminal, a first conductive sheet is arranged between the first positive pin and the second positive pin, and a second conductive sheet is arranged between the first negative pin and the second negative pin.

[0020] In one or more embodiments of the present application, the switching structure further comprises a third positive terminal and a third negative terminal, when the switching piece is in the second position, the third positive terminal and the third negative terminal are connected, the third positive terminal is connected to the first positive electrode, the third negative terminal is connected to the second negative electrode, at this time, the total positive output terminal is connected to the second positive electrode, and the total negative output terminal is connected to the first negative electrode; the switching piece is slidingly connected between the first position and the second position.

[0021] In one or more embodiments of the present application, the third positive terminal and the third negative terminal are clip terminals, one side of the switching piece has the third positive pin corresponding to the third positive terminal and the third negative pin corresponding to the third negative terminal, a third conductive sheet is arranged between the third positive pin and the third negative pin, the first positive pin, the first negative pin, the second positive pin, the second negative pin, the third positive pin and the third negative pin are insert molded in the switching piece and insulated from each other, the first positive terminal, the second positive terminal, the first negative terminal and the second negative terminal are arranged in the same direction and side by side and define a first axis, the third positive terminal and the third negative terminal are arranged in the same direction and side by side and define a second axis, and the switching piece is slidingly connected between the first axis and the second axis; the second positive pin is arranged opposite to the third positive pin.

[0022] In one or more embodiments of the present application, a dial plate is further included, an operation hole is arranged on the shell at the switching piece, the dial plate is connected to the switching piece and located in the operation hole, a dial block is arranged on the top of the dial plate, and a top wall of the dial block is below the surface of the shell or flush with the surface of the shell.

[0023] In one or more embodiments of the present application, one side of the dial plate facing the switching piece is provided with a claw arranged in the opposite direction, the switching piece is provided with a jack hole for inserting the claw, and one side of the claw away from the dial plate is provided with a guide surface.

[0024] In one or more embodiments of the present application, an embedding groove is arranged on the inner wall of the operation hole, a clamping block is arranged on the side of the embedding groove and attached to the dial plate, and a guide surface is arranged on the side of the clamping block.

[0025] In one or more embodiments of the present application, the switching piece is provided with a third positive pin and a third negative pin on one side of the first positive pin, and the third positive pin and the third negative pin are electrically connected; when the switching piece is in the second position, the third positive pin is inserted into the first positive terminal, and the third negative pin is inserted into the second negative terminal; at this time, the total positive output end is connected to the second positive pole, and the total negative output end is connected to the first negative pole; or, the third positive pin is inserted into the second positive terminal, and the third negative pin is inserted into the first negative terminal, at this time, the total positive output end is connected to the first positive pole, and the total negative output end is connected to the second negative pole.

[0026] In one or more embodiments of the present application, a third conductive sheet is provided between the third positive pin and the third negative pin; the first positive pin, the first negative pin, the second positive pin, the second negative pin, the third positive pin and the third negative pin are insert-molded in the switching piece and insulated from each other, an operation hole is formed on the shell at the position of the switching piece, the switching piece is inserted into the operation hole along the height direction of the shell, the insertion direction of the first positive terminal, the second negative terminal, the second positive terminal and the second negative terminal is towards the operation hole along the height direction of the shell, and the shell is provided with a holding groove on the side of the operation hole.

[0027] Compared with the prior art, the present application can realize the switching of 20V and 40V voltages by manually moving the switching piece or manually inserting the switching piece in reverse, so as to meet the needs of different working conditions of electric tools, and has high versatility and high convenience. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 It is a schematic diagram of the overall structure of the dual-voltage battery pack in Embodiment 1 of the present application;

[0030] Figure 2 It is a sectional view of the dual-voltage battery pack in Embodiment 1 of the present application;

[0031] Figure 3 It is an exploded view of the switching structure in Embodiment 1 of the present application;

[0032] Figure 4 It is Figure 1 It is an enlarged view of part A in FIG. 6;

[0033] Figure 5Figure 1 is a schematic view of the switching structure in the first position in the embodiment 1 of the present application;

[0034] Figure 6 Figure 2 is an assembly view of the switching member and the dial plate in the embodiment 1 of the present application;

[0035] Figure 7 Figure 3 is a schematic view of the switching structure in the second position in the embodiment 1 of the present application;

[0036] Figure 8 Figure 4 is an exploded view of the dual-voltage battery pack in the embodiment 2 of the present application Figure 1 ;

[0037] Figure 9 Figure 5 is an exploded view of the dual-voltage battery pack in the embodiment 2 of the present application Figure 2 ;

[0038] Figure 10 Figure 6 is an exploded view of the dual-voltage battery pack in the embodiment 2 of the present application Figure 3 .

[0039] Explanation of main reference numerals:

[0040] 1, housing; 11, joint; 111, operating member; 112, locking member; 113, guide rail; 114, total positive output socket; 115, total negative output socket; 116, biasing member; 12, total positive output end; 13, total negative output end; 14, operating hole; 141, embedding groove; 15, operating groove; 151, insertion hole; 152, holding groove; 20, bracket; 21, first battery pack; 22, second battery pack; 3, switching structure; 31, switching member; 311, insertion hole; 312, insulating column; 32, dial plate; 321, dial block; 322, clamping block; 323, guide surface; 324, hook; 325, guide surface; 33, first positive pin; 331, first conductive sheet; 34, second positive pin; 35, first negative pin; 351, second conductive sheet; 36, second negative pin; 37, third positive pin; 371, third conductive sheet; 38, third negative pin; 41, first positive terminal; 42, first negative terminal; 43, second positive terminal; 44, second negative terminal; 45, third positive terminal; 46, third negative terminal. DETAILED DESCRIPTION

[0041] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0042] The dual-voltage battery pack disclosed in the application is used in connection with a first power tool or a second power tool, wherein the working voltage of the first power tool is a first voltage, and the working voltage of the second power tool is a second voltage. Based on the working voltages required by the two power tools, the dual-voltage battery pack can meet the working needs of the two power tools through switching. Embodiments

[0043] As shown in Figure 1 and Figure 2 , the dual-voltage battery pack in an embodiment of the application includes a shell 1, a first battery pack 21, a second battery pack 22, a support 20, and a switching structure 3. The support 20 is accommodated in the shell 1 and is used to support the first battery pack 21 and the second battery pack 22. The first battery pack 21 is composed of a plurality of battery cells connected in series and has a first positive electrode and a first negative electrode. The second battery pack 22 is also composed of a plurality of battery cells connected in series and has a second positive electrode and a second negative electrode. Among them, the number of battery cells of the first battery pack 21 can be configured as 5, and the number of battery cells of the second battery pack 22 can also be configured as 5. Of course, those skilled in the art can understand that, in order to adapt to different working conditions, the number of battery cells here can be other numbers, and of course, different numbers of replacement are also within the protection scope of the application.

[0044] The shell 1 can have a combination part 11. The dual-voltage battery pack can be connected with the first power tool or the second power tool through the combination part 11. Specifically, the first power tool and the second power tool can each be provided with a battery connecting part combined with the combination part 11. The battery connecting part can be provided with a lock groove. The combination part 11 can be provided with an operating member 111. The operating member 111 can be connected with a locking member 112 that can be combined with the lock groove. The locking member 112 can be used to lock the position of the dual-voltage battery pack on the first power tool or the second power tool. The operating member 111 can drive the locking member 112 to move, so that the locking member 112 is separated from the lock groove. The shell 1 is further provided with a biasing member 116. The biasing member 116 can be a spring. The biasing member 116 can be located between the operating member 111 and the support 20. When the operating member 111 drives the locking member 112 to move, the biasing member 116 is deformed and has a tendency to reset the locking member 112, that is, has elastic potential energy to reset the locking member 112.

[0045] Further, guide rails 113 can be provided on both sides of the combination part 11. The first power tool and the second power tool can each be provided with a sliding groove adapted to the guide rails 113 at the joint with the combination part 11. Through the cooperation of the guide rails 113 and the sliding groove, the first power tool or the second power tool can be smoothly connected with the combination part 11 of the dual-voltage battery pack.

[0046] In combination Figure 3The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115.

[0047] The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115. Figure 3 The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115. Figure 4 The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115. The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115.

[0048] The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115. The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115.

[0049] The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115. The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115.

[0050] The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115. Figure 3 The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115. Figure 5 The combination part 11 can be provided with a voltage output part, which only has a total positive output end 12 and a total negative output end 13 for outputting voltage, and the combination part 11 can be provided with a total positive output socket 114 and a total negative output socket 115, the total positive output end 12 can be electrically connected with the blade terminal of the electric tool through the total positive output socket 114, and the total negative output end 13 can be electrically connected with the blade terminal of the electric tool through the total negative output socket 115.

[0051] In combination Figure 6 Correspondingly, the side of the switching piece 31 away from the dial plate 32 can be provided with the first positive pin 33, the first negative pin 35, the second positive pin 34, the second negative pin 36, the third positive pin 37 and the third negative pin 38 corresponding to the first positive terminal 41, the first negative terminal 42, the second positive terminal 43, the second negative terminal 44, the third positive terminal 45 and the third negative terminal 46 respectively, the first positive pin 33, the first negative pin 35, the second positive pin 34, the second negative pin 36, the third positive pin 37 and the third negative pin 38 can be insert-molded in the switching piece 31 and insulated from each other, of course, it can be understood that other installation methods can also be adopted. In addition, the first positive pin 33 and the second positive pin 34 are connected by the first conductive sheet 331, the first negative pin 35 and the second negative pin 36 are connected by the second conductive sheet 351, and the third positive pin 37 and the third negative pin 38 are connected by the third conductive sheet 371 to realize electrical connection.

[0052] Further, in order to prevent conduction between the second positive pin 34 and the third positive pin 37 and conduction between the first negative pin 35 and the third negative pin 38, the switching piece 31 can be provided with an insulating column 312 between the second positive pin 34 and the third positive pin 37 and between the first negative pin 35 and the third negative pin 38.

[0053] Further, in terms of specific position setting, the first positive terminal 41, the second positive terminal 43, the first negative terminal 42 and the second negative terminal 44 can be arranged in the same direction along the width direction of the shell 1 and define a first axis, the third positive terminal 45 and the third negative terminal 46 can also be arranged in the same direction along the width direction of the shell 1 and define a second axis, the second positive terminal 43 and the third positive terminal 45 are arranged opposite to each other, and the first negative terminal 42 and the third negative terminal 46 are arranged opposite to each other. Correspondingly, the first positive pin 33, the second positive pin 34, the first negative pin 35 and the second negative pin 36 can be arranged in the same direction along the width direction of the shell 1, the third positive pin 37 and the third negative pin 38 can be arranged in the same direction along the width direction of the shell 1, the second positive pin 34 and the third positive pin 37 are arranged opposite to each other, and the first negative pin 35 and the third negative pin 38 are arranged opposite to each other. The switching piece 31 slides between the first axis and the second axis, so that the switching structure 3 is in the first position or the second position.

[0054] Specifically, referring to Figure 5When the switching structure 3 is located at the first position, the first positive pin 33 is inserted into the first positive terminal 41, the second positive pin 34 is inserted into the second positive terminal 43, the first negative pin 35 is inserted into the first negative terminal 42, and the second negative pin 36 is inserted into the second negative terminal 44, at this time, the first battery pack 21 and the second battery pack 22 form a parallel structure. The total positive output end 12 is connected to the second positive terminal 43, the total negative output end 13 is connected to the first negative terminal 42, and the dual-voltage battery pack is connected to the first electric tool and outputs 20V voltage to the first electric tool.

[0055] With reference to Figure 7 When the moving switching piece 31 moves the switching structure 3 to the second position, the third positive pin 37 is inserted into the third positive terminal 45, and the third negative pin 38 is inserted into the third negative terminal 46, at this time, the first battery pack 21 and the second battery pack 22 form a series structure. The total positive output end 12 is connected to the second positive terminal 43, the total negative output end 13 is connected to the first negative terminal 42, and the dual-voltage battery pack is connected to the second electric tool and outputs 40V voltage to the second electric tool.

[0056] The embodiment realizes that the dual-voltage battery pack outputs 20V voltage or 40V voltage to the outside by moving the switching piece 31 to move the switching structure 3 to the first position or the second position, which meets the use of electric tools in different working conditions. Embodiment

[0057] With reference to Figure 8-10 In the embodiment, the third positive pin 37 and the third negative pin 38 can be located on one side of the first positive pin 33 on the switching piece 31, the third positive pin 37 and the third negative pin 38 can be insert-molded in the switching piece 31 and insulated from each other, and the third positive pin 37 and the third negative pin 38 are electrically connected through the third conductive sheet 371. The housing 1 located at the switching piece 31 can be provided with an operation slot 15, and the bottom of the operation slot 15 can be provided with an insertion hole 151 for inserting the first positive pin 33, the first negative pin 35, the second positive pin 34, the second negative pin 36, the third positive pin 37 and the third negative pin 38. The side of the housing 1 located in the operation slot 15 can be provided with a holding slot 152, the switching piece 31 can be taken out through the holding slot 152 and inserted into the operation slot 15 along the height direction of the housing 1, and correspondingly, the first positive terminal 41, the second positive terminal 43, the first negative terminal 42 and the second negative terminal 44 are directed to the operation hole 14 along the height direction of the housing 1.

[0058] When it is needed to switch the switch structure 3 from the first position to the second position, the switch member 31 is pulled out, and then the switch member 31 is inserted into the operation slot 15 after being turned over, so that the third positive pin 37 is inserted into the second positive terminal 43 and the third negative pin 38 is inserted into the first negative terminal 42. At this time, the first battery pack 21 and the second battery pack 22 form a series structure. The total positive output end 12 is connected to the first positive terminal 41, and the total negative output end 13 is connected to the second negative terminal 44. The dual-voltage battery pack is connected to the second power tool and outputs 40V voltage to the second power tool.

[0059] Further, in other embodiments, the third positive pin 37 can be inserted into the first positive terminal 41, and the third negative pin 38 can be inserted into the second negative terminal 44, so that the first battery pack 21 and the second battery pack 22 form a series structure. The total positive output end 12 is connected to the second positive terminal 43, and the total negative output end 13 is connected to the first negative terminal 42. The dual-voltage battery pack is connected to the second power tool and outputs 40V voltage to the second power tool.

[0060] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0061] Further, it should be understood that although the present specification describes only one independent technical solution for each embodiment, the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A dual-voltage battery pack for connection with a first power tool or a second power tool, the first power tool and the second power tool having a battery connection portion on which a lock groove is provided; characterized in that, The application relates to a double-voltage battery pack, which comprises the following components: a housing with a connecting part, wherein the connecting part has a voltage output part with a total positive output end and a total negative output end for outputting voltage externally; a guide rail arranged on the connecting part; a locking part arranged on the connecting part, which is engaged with a locking groove when the connecting part is combined with a battery connecting part; an operating part connected to the locking part; a biasing part which is deformed when the operating part drives the locking part to move and has a tendency to reset the locking part; a first battery pack composed of a plurality of battery cells connected in series and having a first positive electrode and a first negative electrode; a second battery pack composed of a plurality of battery cells connected in series and having a second positive electrode and a second negative electrode; a support accommodated in the housing and supporting the first battery pack and the second battery pack; and a switching structure having a first position and a second position. When the switching structure is in the first position, the first battery pack and the second battery pack are connected in parallel, the double-voltage battery pack can be connected to a first electric tool and output a first voltage to the first electric tool; when the switching structure is in the second position, the first battery pack and the second battery pack are connected in series, the double-voltage battery pack can be connected to a second electric tool and output a second voltage to the second electric tool; and the switching of the switching structure between the first position and the second position is independent of the first electric tool and / or the second electric tool.

2. The dual voltage battery pack of claim 1, wherein, The switching structure comprises a first positive terminal, a first negative terminal, a second positive terminal, a second negative terminal and a switching part, the first positive terminal is connected to the first positive electrode, the first negative terminal is connected to the first negative electrode, the second positive terminal is connected to the second positive electrode, the second negative terminal is connected to the second negative electrode, when the switching part is in the first position, the first positive terminal is electrically connected to the second positive terminal, and the first negative terminal is electrically connected to the second negative terminal, at this time, the total positive output end is connected to the first positive terminal or the second positive terminal, and the total negative output end is connected to the first negative terminal or the second negative terminal.

3. The dual voltage battery pack of claim 2, wherein, The first positive terminal, the first negative terminal, the second positive terminal and the second negative terminal are clip-pin type terminals, one side of the switching part has a first positive pin, a first negative pin, a second positive pin and a second negative pin corresponding to the first positive terminal, the first negative terminal, the second positive terminal and the second negative terminal, a first conductive sheet is arranged between the first positive pin and the second positive pin, and a second conductive sheet is arranged between the first negative pin and the second negative pin.

4. The dual voltage battery pack of claim 3, wherein, The switching structure further comprises a third positive terminal and a third negative terminal, when the switching part is in the second position, the third positive terminal is connected to the third negative terminal, the third positive terminal is connected to the first positive electrode, the third negative terminal is connected to the second negative electrode, at this time, the total positive output end is connected to the second positive electrode, and the total negative output end is connected to the first negative electrode; and the switching part is slidably connected between the first position and the second position.

5. The dual voltage battery pack of claim 4, wherein, The third positive terminal and the third negative terminal are clip foot type terminals, the switching piece has a third positive pin corresponding to the third positive terminal and a third negative pin corresponding to the third negative terminal on one side, a third conductive sheet is arranged between the third positive pin and the third negative pin, the first positive pin, the first negative pin, the second positive pin, the second negative pin, the third positive pin and the third negative pin are insert-molded in the switching piece and insulated from each other, the first positive terminal, the second positive terminal, the first negative terminal and the second negative terminal are arranged in parallel and define a first axis, the third positive terminal and the third negative terminal are arranged in parallel and define a second axis, and the switching piece is connected between the first axis and the second axis in a sliding manner; the second positive pin is arranged opposite to the third positive pin.

6. The dual voltage battery pack of claim 5, wherein, Further comprising a dial plate, an operation hole is arranged on the shell at the switching piece, the dial plate is connected to the switching piece and located in the operation hole, a dial block is arranged on the top of the dial plate, and the top wall of the dial block is below the surface of the shell or flush with the surface of the shell.

7. The dual voltage battery pack of claim 6, wherein, The side of the dial plate facing the switching piece is provided with a hook arranged in a reverse direction, the switching piece is provided with a insertion hole for the hook, and the side of the hook away from the dial plate is provided with a guide surface.

8. The dual voltage battery pack of claim 6, wherein, The inner wall of the operation hole is provided with a embedding groove, the dial plate is provided with a clamping block on the side edge of the embedding groove, and the side edge of the clamping block is provided with a guide surface.

9. The dual voltage battery pack of claim 3, wherein, The switching piece is provided with a third positive pin and a third negative pin on one side of the first positive pin, and the third positive pin and the third negative pin are electrically connected; when the switching piece is in the second position, the third positive pin is inserted into the first positive terminal, and the third negative pin is inserted into the second negative terminal; at this time, the total positive output end is connected to the second positive electrode, and the total negative output end is connected to the first negative electrode; or, the third positive pin is inserted into the second positive terminal, and the third negative pin is inserted into the first negative terminal, at this time, the total positive output end is connected to the first positive electrode, and the total negative output end is connected to the second negative electrode.

10. The dual voltage battery pack of claim 9, wherein, The third positive pin and the third negative pin are provided with a third conductive sheet; the first positive pin, the first negative pin, the second positive pin, the second negative pin, the third positive pin and the third negative pin are insert-molded in the switching piece and insulated from each other, an operation hole is arranged on the shell at the switching piece, the switching piece is inserted into the operation hole along the height direction of the shell, the insertion direction of the first positive terminal, the second negative terminal, the second positive terminal and the second negative terminal is towards the operation hole along the height direction of the shell, and a holding groove is arranged on the side of the shell at the operation hole.

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