Automatic voltage conversion battery pack

Abstract

The application discloses a kind of voltage automatic conversion battery, when first short-circuit terminal is in short-circuit position, second short-circuit terminal is in short-circuit position simultaneously, at this time, third short-circuit terminal is in separation position, at this time, battery pack exports first voltage to outside;When first short-circuit terminal or second short-circuit terminal changes from short-circuit position to separation position, third short-circuit terminal will be switched from separation position to short-circuit position under the action of first linkage lever and second linkage lever, at this time, battery pack exports second voltage to outside.The application realizes the linkage switching of series-parallel connection two voltages in battery pack, has the advantages of automatic conversion, compact structure, simple, reliable, low cost etc..

Description

Technical Field

[0001] This invention relates to an automatic voltage conversion battery pack, belonging to the field of battery technology. Background Technology

[0002] Power tools, as electrical loads containing motors, are widely used in household and industrial applications. With the continuous development of battery manufacturing technology, more and more power tools are adopting batteries as their power source, forming cordless battery-powered power tools.

[0003] Different types of battery-powered power tools typically have different voltage and current requirements. If each type of battery-powered power tool is equipped with a single voltage level battery to provide voltage and current to the power tool, the availability and convenience of batteries for power tools produced by the same manufacturer would be lacking.

[0004] Given that different tools have different requirements for battery pack output voltage and output current, when there are two or more battery packs inside the battery pack, a larger output current or a longer working time can be obtained with a constant parallel output voltage, or a longer working time with a constant current. Conversely, a higher output voltage or a longer working time can be obtained with a constant series output current. Therefore, how to design a battery pack that can simultaneously provide both series and parallel voltage outputs and can stably cooperate with power tools of different voltages to achieve voltage output conversion is a technical problem that urgently needs to be solved by those skilled in the art. Existing technologies often use the addition of a series-parallel conversion module outside the battery pack or the addition of a conversion interface inside the tool, which results in complex structure, high cost, and low reliability. Summary of the Invention

[0005] Objective: In order to overcome the shortcomings of the existing technology, the present invention provides an automatic voltage conversion battery pack.

[0006] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A voltage-automatic conversion battery pack (2) includes: a housing (1), a battery pack connector (101), a first cell pack (10) having a positive terminal and a negative terminal output, and a second cell pack (11) having a positive terminal and a negative terminal output.

[0008] Also includes:

[0009] Positive output terminal A (6), positive output terminal B (7), negative output terminal C (8) and negative output terminal D (9). The positive output terminal or negative output terminal can be electrically connected to the plug terminal on the tool through the battery pack plug port (15) on the battery pack connector (101). The positive output terminal A (6) and positive output terminal B (7) are respectively electrically connected to the positive terminals of the first battery cell group (10) and the second battery cell group (11). The negative output terminal C (8) and negative output terminal D (9) are respectively electrically connected to the negative terminals of the first battery cell group (10) and the second battery cell group (11).

[0010] Terminal a (13) is electrically connected to the positive output terminal A (6), and terminal Nb (3) is electrically connected to the positive output terminal B (7). The opening directions of terminal a (13) and terminal Nb (3) are the same and they are arranged side by side, one above the other.

[0011] Terminal d (14) is electrically connected to the negative output terminal D (9), and terminal Nc (5) is electrically connected to the negative output terminal C (8). The opening directions of terminal d (14) and terminal Nc (5) are consistent and arranged side by side, and the opening directions of terminal d (14) and terminal Nc (5) are consistent with the opening directions of terminal a (13) and terminal Nb (3).

[0012] Terminal Mb (4) is electrically connected to the positive output terminal B (7), and terminal Mc (12) is electrically connected to the negative output terminal C (8). The opening directions of terminal Mb (4) and terminal Mc (12) are consistent and arranged side by side, and the opening directions of terminal Mb (4) and terminal Mc (12) are consistent with the opening directions of terminal a (13) and terminal Nb (3).

[0013] A first shorting terminal (18) made of conductive material is installed in a first sliding groove (23) extending along the opening direction of terminal a (13) or terminal Nb (3) and can move back and forth along the sliding groove. When the first shorting terminal (18) slides to the end close to terminal a (13) or terminal Nb (3), the first shorting terminal (18) is simultaneously inserted into terminal a (13) and terminal Nb (3) and is in a short-circuited position. At this time, terminal a (13) and terminal Nb (3) are electrically connected through the first shorting terminal (18).

[0014] A second shorting terminal (19) made of conductive material is installed in a second slide groove (30) extending along the opening direction of the terminal d (14) or the terminal Nc (5) and can move back and forth along the slide groove. When the second shorting terminal (19) slides to the end close to the terminal d (14) or the terminal Nc (5), the second shorting terminal (19) is simultaneously inserted into the terminal d (14) and the terminal Nc (5) and is in a short-circuited position. At this time, the terminal d (14) and the terminal Nc (5) are electrically connected through the second shorting terminal (19).

[0015] A third shorting terminal (20) made of conductive material is installed in a third slide groove (27) extending along the opening direction of the terminal Mc (12) or the terminal Mb (4) and can move back and forth along the slide groove. When the third shorting terminal (20) slides to the end close to the terminal Mc (12) or the terminal Mb (4), the third shorting terminal (20) is simultaneously inserted into the terminal Mc (12) and the terminal Mb (4) and is in a short-circuited position. At this time, the terminal Mc (12) and the terminal Mb (4) are electrically connected through the third shorting terminal (20).

[0016] A first linkage lever (24) is provided between the first shorting terminal (18) and the third shorting terminal (20), and a second linkage lever (26) is provided between the second shorting terminal (19) and the third shorting terminal (20). The first linkage lever (24) is mounted on a rotating shaft (25) and can rotate around the rotating shaft (25). The second linkage lever (26) is mounted on a rotating shaft (22) and can rotate around the rotating shaft (22). The two ends of the first linkage lever (24) act on the first shorting terminal (18) and the third shorting terminal (20) respectively to drive them to slide. The two ends of the second linkage lever (26) act on the second shorting terminal (19) and the third shorting terminal (20) respectively to drive them to slide.

[0017] When the first shorting terminal (18) is in the shorting position, the second shorting terminal (19) is also in the shorting position, and the third shorting terminal (20) is in the disconnected position.

[0018] When the first shorting terminal (18) or the second shorting terminal (19) changes from the shorting position to the disconnected position, the third shorting terminal (20) will switch from the disconnected position to the shorting position under the action of the first linkage lever (24) and the second linkage lever (26).

[0019] As a preferred embodiment, the two ends of the first linkage lever (24) pass through the first through hole (29) and the third through hole (32) on the first shorting terminal (18) and the third shorting terminal (20), respectively, and the two ends of the second linkage lever (26) pass through the second through hole (28) and the third through hole (32) on the second shorting terminal (19) and the third shorting terminal (20), respectively.

[0020] As a preferred embodiment, it also includes: a battery pack latch (16) and a battery pack button (17). The battery pack latch (16) locks the tool to the battery pack, and the battery pack is separated from the tool after the battery pack button (17) is pressed.

[0021] As a preferred embodiment, push blocks (31, 34) are provided on at least one end of the first shorting terminal (18) and the second shorting terminal (19), and push blocks (33) are provided on one end of the third shorting terminal (20).

[0022] As a preferred embodiment, it further includes: a first voltage tool (36) and a second voltage tool (40). The first voltage tool (36) is provided with a push rod (39), and the second voltage tool (40) is provided with at least one push rod (35, 21) corresponding to the push block (34, 31). When the first voltage tool (36) is connected to the battery pack (2), its first positive terminal insert (37) and second negative terminal insert (38) are respectively inserted into the positive output terminal B (7) and the negative output terminal C (8). At the same time, the push block (34, 31) is connected to the battery pack (2). The rod (39) pushes the push block (33) to put the third shorting terminal (20) in the disengaged position. When the second voltage tool (40) is connected to the battery pack (2), its second positive terminal plug (41) and second negative terminal plug (42) are respectively inserted into the positive output terminal A (6) and the negative output terminal D (9). At the same time, the push rod (35, 21) pushes the push block (34, 31) to change the first shorting terminal (18) and the second shorting terminal (19) from the shorting position to the disengaged position.

[0023] As a preferred embodiment, the first battery cell group (10) or the second battery cell group (11) is composed of a number of battery cells.

[0024] As a preferred embodiment, the first battery cell group (10) and the second battery cell group (11) are respectively composed of battery cells of the same number, voltage and capacity connected in series or in parallel.

[0025] As a preferred embodiment, the number of cells in the first cell group (10) and the second cell group (11) is 5-20, and the cell voltage is 3.2-4.0V.

[0026] Beneficial effects: The present invention provides an automatic voltage conversion battery pack that realizes the linkage switching of two voltages in series and parallel within the battery pack. It has the advantages of automatic conversion, compact structure, simplicity, reliability, and low cost. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the automatic voltage conversion battery pack structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the automatic voltage conversion battery pack of the present invention.

[0029] Figure 3 This is a schematic diagram showing the arrangement of the output terminals, shorting terminals, slides, and levers in an embodiment of the automatic voltage conversion battery pack of the present invention.

[0030] Figure 4 This is a schematic diagram showing the electrical connection between the conductive terminals and the internal battery cell assembly in an embodiment of the automatic voltage conversion battery pack of the present invention.

[0031] Figure 5 This is a schematic diagram of the connection method between the automatic voltage conversion battery pack embodiment of the present invention and the first voltage tool.

[0032] Figure 6 This is a schematic diagram of the battery pack with automatic voltage conversion according to an embodiment of the present invention after being connected to a first voltage tool.

[0033] Figure 7 This is a schematic diagram of the internal structure of the battery pack with automatic voltage conversion connected to the first voltage tool in an embodiment of the present invention.

[0034] Figure 8 This is a schematic diagram showing the connection of the first voltage tool state circuit in an embodiment of the automatic voltage conversion battery pack of the present invention.

[0035] Figure 9 This is a schematic diagram of the connection method between the automatic voltage conversion battery pack embodiment of the present invention and the second voltage tool.

[0036] Figure 10 This is a schematic diagram of the battery pack with automatic voltage conversion according to an embodiment of the present invention after being connected to a second voltage tool.

[0037] Figure 11 This is a schematic diagram of the internal structure of the battery pack with automatic voltage conversion connected to the second voltage tool in an embodiment of the present invention.

[0038] Figure 12 This is a schematic diagram showing the connection of the second voltage tool state circuit in an embodiment of the automatic voltage conversion battery pack of the present invention. Detailed Implementation

[0039] The present invention will be further described below with reference to specific embodiments.

[0040] like Figure 1 and Figure 2 As shown, a preferred embodiment of an automatic voltage conversion battery pack 2 includes: a housing 1, a battery pack connector 101, a battery pack latch 16, a battery pack button 17, a first cell group 10 consisting of several cells having one positive and one negative output, and a second cell group 11 consisting of several cells having one positive and one negative output. The battery pack connector 101 is part of the housing 1 and is used to connect with a tool. The battery pack latch 16 locks the tool to the battery pack. Pressing the battery pack button 17 allows the battery pack to be detached from the tool.

[0041] like Figure 1 , 2 As shown in Figures 3 and 4, a preferred embodiment of a voltage-automatic conversion battery pack 2 further includes: a positive output terminal A6, a positive output terminal B7, a negative output terminal C8, and a negative output terminal D9. The positive or negative output terminal can be electrically connected to the plug terminals on a tool via the battery pack plug-in port 15. Positive output terminals A6 and B7 are electrically connected to the positive terminals of the first cell group 10 and the second cell group 11, respectively; negative output terminals C8 and D9 are electrically connected to the negative terminals of the first cell group 10 and the second cell group 11, respectively. Terminal a13 is electrically connected to positive output terminal A6, and terminal Nb3 is electrically connected to positive output terminal B7. Terminal a13 and terminal Nb3 have the same opening direction and are arranged side by side vertically; terminal d14 is electrically connected to negative output terminal D9, terminal Nc5 is electrically connected to negative output terminal C8, terminal d14 and terminal Nc5 have the same opening direction and are arranged side by side vertically, and the opening directions of terminals d14 and Nc5 are the same as the opening directions of terminals a13 and Nb3; terminal Mb4 is electrically connected to positive output terminal B7, terminal Mc12 is electrically connected to negative output terminal C8, terminal Mb4 and terminal Mc12 have the same opening direction and are arranged side by side vertically, and the opening directions of terminals Mb4 and Mc12 are the same as the opening directions of terminals a13 and Nb3.

[0042] like Figure 2 , 3As shown in Figures 7 and 11, a preferred embodiment of a voltage-converting battery pack 2 further includes: a first shorting terminal 18 made of conductive material, a second shorting terminal 19 made of conductive material, and a third shorting terminal 20 made of conductive material; the first shorting terminal 18 is installed in a first sliding groove 23 extending along the opening direction of terminal a13 or terminal Nb3 and can move back and forth along the sliding groove; when the first shorting terminal 18 slides to the end near terminal a13 or terminal Nb3, the first shorting terminal 18 is simultaneously inserted into terminal a13 and terminal Nb3, the first shorting terminal 18 is in a short-circuited position, at which time terminal a13 and terminal Nb3 are electrically connected through the first shorting terminal 18; the second shorting terminal 19 is installed in a second sliding groove 23 extending along the opening direction of terminal d14 or terminal Nc5. The second shorting terminal 19 is installed in the groove 30 and can move back and forth along the slide. When the second shorting terminal 19 slides to the end near the terminal d14 or the terminal Nc5, the second shorting terminal 19 is simultaneously inserted into the terminal d14 and the terminal Nc5. The second shorting terminal 19 is in the short-circuited position. At this time, the terminal d14 and the terminal Nc5 are electrically connected through the second shorting terminal 19. The third shorting terminal 20 is installed in the third slide 27 that extends along the opening direction of the terminal Mc12 or the terminal Mb4 and can move back and forth along the slide. When the third shorting terminal 20 slides to the end near the terminal Mc12 or the terminal Mb4, the third shorting terminal 20 is simultaneously inserted into the terminal Mc12 and the terminal Mb4. The third shorting terminal 20 is in the short-circuited position. At this time, the terminal Mc12 and the terminal Mb4 are electrically connected through the third shorting terminal 20.

[0043] like Figure 2 , 3 As shown in Figures 7 and 11, in a preferred embodiment of an automatic voltage conversion battery pack 2, a first linkage lever 24 is provided between the first shorting terminal 18 and the third shorting terminal 20, and a second linkage lever 26 is provided between the second shorting terminal 19 and the third shorting terminal 20. The first linkage lever 24 is mounted on a rotating shaft 25 and can rotate around the rotating shaft 25. The second linkage lever 26 is mounted on a rotating shaft 22 and can rotate around the rotating shaft 22. The two ends of the first linkage lever 24 pass through the first through hole 29 and the third through hole 32 on the first shorting terminal 18 and the third shorting terminal 20, respectively. The two ends of the second linkage lever 26 pass through the second through hole 28 and the third through hole 32 on the second shorting terminal 19 and the third shorting terminal 20, respectively. When the first shorting terminal 18 is in the shorting position, the second shorting terminal 19 is also in the shorting position, and the third shorting terminal 20 is in the disconnected position. At this time, the battery pack 2 outputs the first voltage. When the first shorting terminal 18 or the second shorting terminal 19 changes from the shorting position to the disconnected position, the third shorting terminal 20 will switch from the disconnected position to the shorting position under the action of the first linkage lever 24 and the second linkage lever 26. At this time, the battery pack 2 outputs the second voltage.

[0044] like Figure 1 , 2 As shown in any of 1, 2, 3, 5, 6, 7, 9, 10, and 11, at least one front end of the first shorting terminal 18 and the second shorting terminal 19 can contact the push rod. To better push the shorting terminal, at least one push block is provided on the first shorting terminal 18 and the second shorting terminal 19. In this embodiment, the first shorting terminal 18 is provided with a push block 34, and the second shorting terminal 19 is provided with a push block 31. The front end of the third shorting terminal 20 can contact the push rod. To better push the shorting terminal, in this embodiment, the third shorting terminal 20 is provided with a push block 33. The first voltage tool 36 is provided with a push rod 39, and the second voltage tool 40 is provided with at least one push rod 35 and a push rod 21 corresponding to the push block 34 or the push block 31. When the first voltage tool 36 is connected to the battery pack 2, its first positive terminal insert 37 and first negative terminal insert 38 are respectively inserted into the positive output terminal B7 and the negative output terminal C8, and at the same time, the push rod 39... Pushing push block 33 causes the third shorting terminal 20 to be in the disengaged position. When the second voltage tool 40 is connected to the battery pack 2, its second positive terminal plug 41 and second negative terminal plug 42 are respectively inserted into the positive output terminal A6 and the negative output terminal D9. At the same time, the first push rod 35 and the second push rod 21 push the first push block 34 and the second push block 31 respectively, causing the first shorting terminal 18 and the second shorting terminal 19 to change from the shorting position to the disengaged position. Under the action of the lever, the third shorting terminal 20 changes from the disengaged position to the shorting position.

[0045] like Figure 5-8 As shown, this is the first voltage output state of a preferred embodiment of the voltage-automatic conversion battery pack 2 of the present invention. The battery pack 2 includes a first cell group 10 and a second cell group 11. The first cell group 10 and the second cell group 11 are each composed of 5 cells with a voltage of 3.6V connected in series. That is, the positive and negative voltages of the first cell group 10 are 5*3.6=18V, and similarly, the positive and negative voltages of the second cell group 11 are 5*3.6=18V. The positive output terminal A6 and the positive output terminal B7 are respectively electrically connected to the positive terminals of the first cell group 10 and the second cell group 11, and the negative output terminal C8 and the negative output terminal D9 are respectively electrically connected to the negative terminals of the first cell group 10 and the second cell group 11. Figure 5 This is a schematic diagram showing the connection between battery pack 2 and the first voltage tool 36. Figure 6 , Figure 7 This is a schematic diagram after the first voltage tool 36 is inserted into the battery pack 2. When the first positive terminal insert 37 and the first negative terminal insert 38 are inserted into the positive output terminal B7 and the negative output terminal C8 respectively on the first voltage tool 36, the push rod 39 will push the push block 33 to the position where the third shorting terminal 20 is separated from the terminal. Under the action of the lever 24 and the lever 26, the first shorting terminal 18 and the second shorting terminal 19 will change from the separated position to the shorting position. Figure 8This is a circuit diagram showing the connection of battery pack 2 to the first voltage tool 36. At this time, the first shorting terminal 18 shorts terminal a13 and terminal Nb3, the second shorting terminal 19 shorts terminal d14 and terminal Nc5, the connecting part A601 of the positive output terminal A6 is connected to the positive terminal of the first cell group 10, the positive output terminal A6 has the same potential as terminal a13 and terminal Nb3, the connecting part Nb301 of terminal Nb3 is connected to the second connecting part B702 of the positive output terminal B7, the second connecting part B702 is connected to the positive terminal of the first cell group 10; the first connecting part B701 of the positive output terminal B7 is connected to the positive terminal of the second cell group 10. In this way, the positive output terminal B7 is connected to the positive terminals of the first cell group 10 and the second cell group 10, and is connected to the first positive plug 37 on the first voltage tool 36. Since the first connection part C801 of the negative output terminal C8 is connected to the negative terminal of the first battery cell group 10; the negative terminal of the second battery cell group 11 is connected to the connection part D901 of the negative output terminal D9, the negative output terminal D9 has the same potential as the terminal d14 and the terminal Nc5, and the connection part Nc501 of the terminal Nc5 is connected to the second connection part C802 of the negative output terminal C8, the negative output terminal C8 is thus connected to the negative terminals of the first battery cell group 10 and the second battery cell group 10, and is connected to the first negative plug 38 on the first voltage tool 36.

[0046] The positive output terminal B7 and the negative output terminal C8 on the battery pack 2 are respectively connected to the positive and negative terminals of the first cell group 10 and the second cell group 11. The first cell group 10 and the second cell group 11 are connected in parallel with an 18V output. At this time, the battery pack 2 has a high discharge current capability and a long working time.

[0047] like Figure 9-12 As shown, this is the second voltage output state of a preferred embodiment of the automatic voltage conversion battery pack 2 of the present invention. The battery pack 2 includes a first cell group 10 and a second cell group 11. The first cell group 10 and the second cell group 11 are each composed of 5 cells with a voltage of 3.6V connected in series. That is, the positive and negative voltages of the first cell group 10 are 5*3.6=18V, and similarly, the positive and negative voltages of the second cell group 11 are 5*3.6=18V. The positive output terminal A6 and the positive output terminal B7 are respectively electrically connected to the positive terminals of the first cell group 10 and the second cell group 11, and the negative output terminal C8 and the negative output terminal D9 are respectively electrically connected to the negative terminals of the first cell group 10 and the second cell group 11. Figure 9 This is a schematic diagram showing the connection between battery pack 2 and the second voltage tool 40. Figure 10 , Figure 11This is a schematic diagram showing the second voltage tool 40 after it is inserted into the battery pack 2. Simultaneously, as the second positive terminal insert 41 and the second negative terminal insert 42 are inserted into the positive output terminal A6 and the negative output terminal D9 respectively, push rods 35 and 21 push push blocks 34 and 31 to the position where the first shorting terminal 18 and the second shorting terminal 19 are separated from the terminals. Under the action of levers 24 and 26, the third shorting terminal 20 changes from the separated position to the shorted position. Figure 12 This is a circuit diagram showing the connection of battery pack 2 to the second voltage tool 40. At this time, the third shorting terminal 20 shorts terminals Mc12 and Mb4. The connecting part Mc1201 of terminal Mc12 is connected to the first connecting part C801 of the negative output terminal C8, and the connecting part Mb401 of terminal Mb4 is connected to the second connecting part B702 of the positive output terminal B7. The positive terminal of the first cell group 10 is connected to the second positive terminal insert 41 on the second voltage tool 40 via the connecting part A601 of the positive output terminal A6, and the negative terminal of the first cell group 10 is connected to the negative output terminal C801. The first connecting part C801 is connected to the connecting part Mc1201 of terminal Mc12, and then terminal Mc12 is short-circuited with terminal Mb4. It is connected to the second connecting part B702 of positive output terminal B7 via the connecting part Mb401 of terminal Mb4. Then, the first connecting part B701 of positive output terminal B7 is connected in series with the positive terminal of the second cell group 11. The negative terminal of the second cell group 11 is connected to the connecting part D901 of negative output terminal D9. The negative terminal of the second cell group 11 is connected to the second negative terminal plug 42 on the second voltage tool 40 through the negative terminal D9.

[0048] The positive output terminal A6 of battery pack 2 is connected to the positive terminal of the first cell group 10. The negative terminal of the first cell group 10 is connected to the positive terminal of the second cell group 11 via the negative output terminal C8, terminal Mc12, terminal Mb4 and terminal B7. The second cell group 11 is connected to the positive and negative terminals of the first cell group 10 and the second cell group 11 respectively. The first cell group 10 and the negative output terminal D9, i.e. the positive output terminal A6 and the negative output terminal D9, connect the first cell group 10 and the second cell group 11 in series, and the output voltage is 36V. At this time, battery pack 2 has a high discharge voltage, high discharge power and discharge efficiency, and is more suitable for powering high-power tools.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A voltage-automatic conversion battery pack (2), characterized in that, include: The casing (1), the battery pack connector (101), the first cell pack (10) with a positive and a negative output, and the second cell pack (11) with a positive and a negative output. Also includes: Positive output terminal A (6), positive output terminal B (7), negative output terminal C (8) and negative output terminal D (9). The positive output terminal or negative output terminal can be electrically connected to the plug terminal on the tool through the battery pack plug port (15) on the battery pack connector (101). The positive output terminal A (6) and positive output terminal B (7) are respectively electrically connected to the positive terminals of the first battery cell group (10) and the second battery cell group (11). The negative output terminal C (8) and negative output terminal D (9) are respectively electrically connected to the negative terminals of the first battery cell group (10) and the second battery cell group (11). Terminal a (13) is electrically connected to the positive output terminal A (6), and terminal Nb (3) is electrically connected to the positive output terminal B (7). The opening directions of terminal a (13) and terminal Nb (3) are the same and they are arranged side by side, one above the other. Terminal d (14) is electrically connected to the negative output terminal D (9), and terminal Nc (5) is electrically connected to the negative output terminal C (8). The opening directions of terminal d (14) and terminal Nc (5) are consistent and arranged side by side, and the opening directions of terminal d (14) and terminal Nc (5) are consistent with the opening directions of terminal a (13) and terminal Nb (3). Terminal Mb (4) is electrically connected to the positive output terminal B (7), and terminal Mc (12) is electrically connected to the negative output terminal C (8). The opening directions of terminal Mb (4) and terminal Mc (12) are consistent and arranged side by side, and the opening directions of terminal Mb (4) and terminal Mc (12) are consistent with the opening directions of terminal a (13) and terminal Nb (3). A first shorting terminal (18) made of conductive material is installed in a first sliding groove (23) extending along the opening direction of terminal a (13) or terminal Nb (3) and can move back and forth along the sliding groove. When the first shorting terminal (18) slides to the end close to terminal a (13) or terminal Nb (3), the first shorting terminal (18) is simultaneously inserted into terminal a (13) and terminal Nb (3) and is in a short-circuited position. At this time, terminal a (13) and terminal Nb (3) are electrically connected through the first shorting terminal (18). A second shorting terminal (19) made of conductive material is installed in a second slide groove (30) extending along the opening direction of the terminal d (14) or the terminal Nc (5) and can move back and forth along the slide groove. When the second shorting terminal (19) slides to the end close to the terminal d (14) or the terminal Nc (5), the second shorting terminal (19) is simultaneously inserted into the terminal d (14) and the terminal Nc (5) and is in a short-circuited position. At this time, the terminal d (14) and the terminal Nc (5) are electrically connected through the second shorting terminal (19). A third shorting terminal (20) made of conductive material is installed in a third slide groove (27) extending along the opening direction of the terminal Mc (12) or the terminal Mb (4) and can move back and forth along the slide groove. When the third shorting terminal (20) slides to the end close to the terminal Mc (12) or the terminal Mb (4), the third shorting terminal (20) is simultaneously inserted into the terminal Mc (12) and the terminal Mb (4) and is in a short-circuited position. At this time, the terminal Mc (12) and the terminal Mb (4) are electrically connected through the third shorting terminal (20). A first linkage lever (24) is provided between the first shorting terminal (18) and the third shorting terminal (20), and a second linkage lever (26) is provided between the second shorting terminal (19) and the third shorting terminal (20). The first linkage lever (24) is mounted on a rotating shaft (25) and can rotate around the rotating shaft (25). The second linkage lever (26) is mounted on a rotating shaft (22) and can rotate around the rotating shaft (22). The two ends of the first linkage lever (24) act on the first shorting terminal (18) and the third shorting terminal (20) respectively to drive them to slide. The two ends of the second linkage lever (26) act on the second shorting terminal (19) and the third shorting terminal (20) respectively to drive them to slide. When the first shorting terminal (18) is in the shorting position, the second shorting terminal (19) is also in the shorting position, and the third shorting terminal (20) is in the disconnected position. When the first shorting terminal (18) or the second shorting terminal (19) changes from the shorting position to the disconnected position, the third shorting terminal (20) will switch from the disconnected position to the shorting position under the action of the first linkage lever (24) and the second linkage lever (26).

2. The voltage automatic conversion battery pack (2) according to claim 1, characterized in that: The two ends of the first linkage lever (24) pass through the first through hole (29) and the third through hole (32) on the first shorting terminal (18) and the third shorting terminal (20), respectively. The two ends of the second linkage lever (26) pass through the second through hole (28) and the third through hole (32) on the second shorting terminal (19) and the third shorting terminal (20), respectively.

3. The voltage automatic conversion battery pack (2) according to claim 1, characterized in that: Also includes: Battery pack latch (16) and battery pack button (17). The battery pack latch (16) locks the tool and the battery pack together. Pressing the battery pack button (17) separates the battery pack from the tool.

4. The voltage automatic conversion battery pack (2) according to claim 1, characterized in that: A first push block (31, 34) is provided on at least one of the first shorting terminal (18) and the second shorting terminal (19), and a second push block (33) is provided on the third shorting terminal (20).

5. The voltage-automatic conversion battery pack (2) according to claim 4, characterized in that: Also includes: A first voltage tool (36) and a second voltage tool (40) are provided. The first voltage tool (36) is provided with a second push rod (39), and the second voltage tool (40) is provided with at least one first push rod (35, 21) corresponding to the first push block (34, 31). When the first voltage tool (36) is connected to the battery pack (2), its first positive terminal plug (37) and second negative terminal plug (38) are respectively inserted into the positive output terminal B (7) and the negative output terminal C (8), and at the same time, the second push rod (39) pushes... The second push block (33) is moved so that the third short-circuit terminal (20) is in the disengaged position. When the second voltage tool (40) is connected to the battery pack (2), its second positive terminal plug (41) and second negative terminal plug (42) are respectively inserted into the positive output terminal A (6) and the negative output terminal D (9). At the same time, the first push rod (35, 21) pushes the first push block (34, 31) so that the first short-circuit terminal (18) and the second short-circuit terminal (19) change from the short-circuit position to the disengaged position.

6. The voltage automatic conversion battery pack (2) according to claim 1, characterized in that: The first battery cell group (10) or the second battery cell group (11) is composed of several battery cells.

7. The voltage-automatic conversion battery pack (2) according to claim 5, characterized in that: The first battery cell group (10) and the second battery cell group (11) are respectively composed of battery cells of the same number, voltage and capacity connected in series or in parallel.

8. The voltage automatic conversion battery pack (2) according to claim 6, characterized in that: The number of cells in the first cell group (10) and the second cell group (11) is 5-20, and the cell voltage is 3.2-4.0V.

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