Battery pack and power tool combination

Abstract

The application relates to a battery pack and a power tool combination, the battery pack is connected to the power tool and is configured to supply power to the power tool; the battery pack comprises a shell, a battery cell assembly installed in the shell and a terminal assembly for outputting power of the battery cell assembly; the power tool comprises a tool terminal electrically connected to the terminal assembly; a variable voltage assembly comprises a movable element movably arranged, the shell has an opening penetrating through, the power tool comprises an abutting portion corresponding to the movable element, the movable element is configured to contact the abutting portion through the opening, and the abutting portion drives the movable element to move, so that the battery pack is switched between high voltage and low voltage; when the battery pack is installed to the power tool, the abutting portion first contacts the movable element and drives the movable element to move, then the tool terminal contacts the terminal assembly and realizes electrical conduction with the terminal assembly. The application is beneficial to prolong the service life of the power tool and improve the use safety of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and in particular to a battery pack and a power tool assembly having the battery pack. Background Technology

[0002] Power tools are instruments that use a motor to drive the working head to perform operations such as grinding, cutting, polishing, and fastening on workpieces. Traditional power tools are powered by 220V AC mains power, but with the rapid development of lithium batteries, lithium-ion power tools powered by battery packs are gradually replacing traditional AC-powered power tools.

[0003] Battery packs typically contain multiple cells to output voltage. To cope with different power and operating conditions, lithium-ion power tool battery packs have evolved to offer various voltage options, such as the common 20V and 40V platform battery packs. For users, this necessitates purchasing multiple battery packs of different platforms, increasing costs. Furthermore, during operation, users must carry multiple battery packs simultaneously and switch between them, impacting work efficiency and resulting in a poor user experience.

[0004] Therefore, it is indeed necessary to provide an improved battery pack and power tool combination to overcome the shortcomings of the existing technology. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a battery pack and power tool combination capable of outputting different voltages.

[0006] The present invention addresses the problems of the prior art by adopting the following technical solution: a battery pack, which is coupled to a power tool and configured to supply power to the power tool; the battery pack includes a housing, a cell assembly installed in the housing, and a terminal assembly that outputs power from the cell assembly to the outside; the power tool includes a tool terminal electrically connected to the terminal assembly. The battery cell assembly includes a first battery cell group and a second battery cell group connected to each other. The battery pack includes a transformer assembly for switching the output voltage of the battery cell assembly. The transformer assembly is configured to change the electrical connection relationship between the first battery cell group and the second battery cell group so that the battery pack outputs high voltage and low voltage values. The transformer assembly includes a movable element, the housing has a through opening, the power tool includes an abutment corresponding to the movable element, the movable element is configured to contact the abutment via the opening, and the abutment drives the movable element to move, thereby causing the battery pack to switch between the high voltage and the low voltage; When the battery pack is installed on the power tool, the abutment portion first contacts the moving element and drives the moving element to move, and then the tool terminal contacts the terminal assembly and achieves electrical conduction with the terminal assembly.

[0007] A further improvement is as follows: when the battery pack is not installed in the power tool, the battery pack outputs a high voltage; when the battery pack is installed in the power tool, the battery pack outputs a low voltage.

[0008] A further improvement is as follows: the transformer assembly includes a first elastic element that biases the moving element. The first elastic element is configured to abut against the moving element so that when the moving element is not subjected to the force of the abutment, the battery pack outputs the high voltage; when the moving element is subjected to the force of the abutment and moves, the moving element overcomes the elastic force of the first elastic element and causes the battery pack to switch from the high voltage to the low voltage.

[0009] A further improvement is that the opening is adjacent to the terminal assembly, and the moving element is exposed to the outside of the battery pack via the opening.

[0010] A further improvement is that when the battery pack outputs the low voltage, at least part of the moving element retracts into the opening.

[0011] A further improvement is as follows: the transformer assembly includes a switching element connected to the moving element, a plurality of connecting pieces connected to the cell assembly, and a housing that at least partially houses the connecting pieces and the switching element. The moving element is movably connected to the housing, and the switching element is connected to the connecting pieces. The movement of the moving element drives the switching element to move.

[0012] A further improvement is as follows: the terminal assembly extends along the front-to-back direction, the housing is installed on the front end of the cell assembly near the terminal assembly, and the moving element moves along the up-down direction.

[0013] A further improvement is as follows: the terminal assembly extends along the front-to-back direction, the housing is located on the upper side of the cell assembly, and the moving element moves along the front-to-back direction.

[0014] A further improvement is that the housing is located behind the terminal assembly, and the upper side of the housing is not higher than the upper side of the terminal assembly.

[0015] A further improvement is that the movable element extends through the terminal assembly and extends to the front side of the terminal assembly.

[0016] A further improvement is as follows: the terminal assembly includes a terminal block, several output terminals housed in the terminal block, and a channel extending through the terminal block in a front-to-back direction, with the movable element passing through the channel.

[0017] The present invention can also solve the problems of the prior art by adopting the following technical solution: a battery pack, which is connected to a power tool and configured to supply power to the power tool; the battery pack includes a housing, a cell assembly installed in the housing, a control assembly connected to the cell assembly, and a terminal assembly that outputs power from the cell assembly to the outside, the terminal assembly being connected to the control assembly, and the power tool including a tool terminal electrically connected to the terminal assembly; The battery pack includes a transformer assembly for switching the output voltage of the cell assembly, the output voltage including high voltage and low voltage of different values, the transformer assembly including a movable element, the housing having a through opening, the power tool including an abutment portion corresponding to the movable element, the movable element being configured to contact the abutment portion via the opening, and the abutment portion driving the movable element to move, thereby causing the battery pack to switch between high voltage and low voltage; When the battery pack is installed on the power tool, the transformer assembly first switches the output voltage of the cell assembly, and then the battery pack and the power tool are electrically connected.

[0018] The present invention can also solve the problems of the prior art by adopting the following technical solution: a power tool assembly, including a power tool and a battery pack connected to each other; the power tool includes a housing, a drive component installed in the housing and an output head connected to the drive component, the battery pack provides energy to the drive component, and the housing includes a battery pack mounting base for installing the battery pack; The battery pack is any of the battery packs described above, and the abutment portion is disposed on the battery pack mounting base.

[0019] A further improvement is as follows: the battery pack mounting base has a first type of mounting base and a second type of mounting base with different structures. When the power tool is assembled with the first type of mounting base, the battery pack outputs the high voltage; when the abutment part is disposed on the second type of mounting base, the battery pack outputs the low voltage.

[0020] A further improvement is as follows: the first type of mounting base has a recessed slot, the slot and the opening of the housing are positioned correspondingly, and when the battery pack is installed on the first type of mounting base, the moving element of the transformer assembly passes through the opening and extends into the slot.

[0021] A further improvement is as follows: the battery pack is installed to the battery pack mounting base along the front-to-back direction, and the moving direction of the moving element is perpendicular to the insertion direction of the battery pack, or the moving direction of the moving element is parallel to the insertion direction of the battery pack.

[0022] Compared with the prior art, the present invention has the following advantages: by first realizing the voltage switching of the transformer component and then realizing the electrical conduction of the battery pack and power tool, it is beneficial to improve the service life of the power tool and improve the safety of the battery pack. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery pack according to the first embodiment of the present invention, in which the battery pack outputs a high voltage; Figure 2 yes Figure 1 The diagram shows a complete unit with a low-voltage output from the battery pack. Figure 3 yes Figure 1 An exploded view of the battery pack shown. Figure 4 yes Figure 1 The diagram shows a first-angle structural schematic of the cell assembly, control assembly, terminal assembly, and transformer assembly in the battery pack. Figure 5 yes Figure 4 The diagram shows an exploded view of the cell assembly, control assembly, terminal assembly, and transformer assembly. Figure 6 yes Figure 4 The diagram shows a second-angle structural schematic of the cell assembly, control assembly, terminal assembly, and transformer assembly. Figure 7 yes Figure 4 The diagram shows the structure of the cell assembly, control assembly, terminal assembly, and transformer assembly from a third angle. Figure 8 yes Figure 7 The diagram shows the internal structure of the control component. Figure 9 yes Figure 1 An exploded view of the transformer assembly in the battery pack shown. Figure 10 yes Figure 1 The diagram shows the connection of the transformer assembly, cell assembly, and terminal assembly in the battery pack. At this time, the battery pack outputs a high voltage. Figure 11 yes Figure 1 The diagram shows the connection of the transformer assembly, cell assembly, and terminal assembly in the battery pack. At this time, the battery pack outputs a low voltage. Figure 12 yes Figure 9The diagram shows the internal structure of the transformer assembly. Figure 13 yes Figure 9 The diagram shows the structure of the switching element in the transformer assembly. Figure 14 This is a schematic diagram of the power tool assembly of the present invention; Figure 15 yes Figure 14 A schematic diagram of the structure of the first type of mounting base in the power tool assembly shown; Figure 16 yes Figure 14 A schematic diagram of the second type of mounting base in the power tool assembly shown; Figure 17 This is a schematic diagram of the battery pack according to the second embodiment of the present invention, in which the battery pack outputs a high voltage; Figure 18 yes Figure 17 The diagram shows a complete unit with a low-voltage output from the battery pack. Figure 19 yes Figure 17 An exploded view of the battery pack shown. Figure 20 yes Figure 19 The diagram shows a first-angle structural schematic of the cell assembly, control assembly, terminal assembly, and transformer assembly in the battery pack. Figure 21 yes Figure 19 The diagram shows a second-angle structural schematic of the cell assembly, control assembly, terminal assembly, and transformer assembly in the battery pack. Figure 22 yes Figure 19 The diagram shows a third-angle structural schematic of the cell assembly, control assembly, terminal assembly, and transformer assembly in the battery pack. Figure 23 yes Figure 19 The diagram shows a fourth-angle structural schematic of the cell assembly, control assembly, terminal assembly, and transformer assembly in the battery pack shown. Figure 24 yes Figure 19 An exploded view of the transformer assembly in the battery pack shown. Detailed Implementation

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0026] Please see Figure 1 , Figure 2 and Figures 14 to 16 As shown, a first embodiment of the present invention relates to a power tool assembly 300, including a power tool 200 and a battery pack 100 connected to each other, wherein the battery pack 100 is coupled to the power tool 200 and configured to supply power to the power tool 200. Furthermore, the power tool 200 can be a traditional power tool such as an electric drill, electric wrench, electric hammer, angle grinder, cutting machine, and sander, or a garden power tool such as a hair dryer, chainsaw, lawn mower, lawn mower, and hedge trimmer. In this embodiment, the power tool 200 is an electric wrench and includes a housing 210, a drive assembly (not shown) installed in the housing 210, an output head 230 connected to the drive assembly, and a battery pack 100 that provides power to the drive assembly. The housing 210 includes a battery pack mounting base 220 for mounting the battery pack 100. Tool terminals 2281 and 2291 corresponding to the battery pack 100 are provided on the battery pack mounting base 220, and the power of the battery pack 100 is transmitted to the drive assembly through the tool terminals 2281 and 2291, thereby driving the output head 230 to perform operations.

[0027] Please see Figure 3 As shown, the battery pack 100 includes a housing 1, a cell assembly 2 installed inside the housing 1, a control assembly 3 connected to the upper side of the cell assembly 2, a terminal assembly 4 connected to the control assembly 3, and a transformer assembly 5 for switching the output voltage of the cell assembly 2. Tool terminals 2281 and 2291 are electrically connected to the terminal assembly 4, which is used to output the power of the cell assembly 2 to the power tool 200. The housing 1 includes an upper housing 11 and a lower housing 12 connected to each other. Screws 14 pass through the upper housing 11 and the lower housing 12 to fix the upper housing 11 and the lower housing 12. Furthermore, the upper housing 11 and the lower housing 12 cover each other to form a closed space, in which the cell assembly 2, the control assembly 3, the terminal assembly 4, and the transformer assembly 5 are all housed.

[0028] Please see Figure 4 and Figure 5As shown, the aforementioned battery cell assembly 2 includes a first battery cell group 21 and a second battery cell group 22 connected to each other, and a battery cell support 24 for mounting the first battery cell group 21 and the second battery cell group 22. Both the first battery cell group 21 and the second battery cell group 22 are formed by connecting several cylindrical battery cells in series, and each battery cell in both battery cell groups has the same voltage value. In this embodiment, both the first battery cell group 21 and the second battery cell group 22 are formed by connecting five battery cells in series, and adjacent battery cells are electrically connected via conductive sheets 25. The nominal voltage of each battery cell is 4V, therefore both the first battery cell group 21 and the second battery cell group 22 have an output voltage of 20V.

[0029] In this embodiment, the first battery cell group 21 has a first positive output terminal 211 and a first negative output terminal 212, and the second battery cell group 22 has a second positive output terminal 221 and a second negative output terminal 222.

[0030] In this embodiment, the terminal assembly 4 includes a total positive output terminal 41 and a total negative output terminal 42 that output power from the battery cell assembly 2. The total positive output terminal 41 and the total negative output terminal 42 are connected to the tool terminals of the power tool 200 and transmit power from the battery cell assembly 2 to the power tool 200. Furthermore, the terminal assembly 4 is mounted on the top surface of the control assembly 3, and the upper housing 11 has an opening 111 corresponding to the total positive output terminal 41 and the total negative output terminal 42, with the total positive output terminal 41 and the total negative output terminal 42 extending into the opening 111.

[0031] Please see Figure 7 and Figure 8 As shown, the control component 3 is installed on the top surface of the cell assembly 2. The control component 3 includes a plate-shaped controller body 31, a conductive port 32 penetrating the controller body 31, and a conductive strip 33 disposed on the controller body 31. The conductive strip 33 connects the cell assembly 2 and the terminal assembly 4 and is configured to realize the conductive connection between the cell assembly 2 and the terminal assembly 4.

[0032] In this embodiment, the conductive port 32 includes a first conductive port 321 connected to the first positive output terminal 211, a second conductive port 322 connected to the first negative output terminal 212, a third conductive port 323 connected to the second positive output terminal 221, and a fourth conductive port 324 connected to the second negative output terminal 222. The conductive strip 33 includes a first conductive strip 331 connecting the first conductive port 321 and the third conductive port 323, and a second conductive strip 332 connecting the second conductive port 322 and the fourth conductive port 324. The total positive output terminal 41 is connected to the first conductive strip 331 and is located between the first conductive port 321 and the third conductive port 323. The total negative output terminal 42 is connected to the second conductive strip 332 and is located between the second conductive port 322 and the fourth conductive port 324.

[0033] Please see Figure 3 and Figure 9 As shown, the transformer assembly 5 includes a housing 50 connected to the cell assembly 2, a plurality of connecting pieces 51 respectively connected to the output terminals, a moving element 55 movably connected to the housing 50, and a switching element 52 connected to the moving element 55. The plurality of connecting pieces 51 are electrically connected to the cell assembly 2, and the switching element 52 of the transformer assembly 5 is connected to the connecting pieces 51. The switching element 52 is configured to change the electrical connection relationship between the plurality of connecting pieces 51, thereby changing the electrical connection relationship between the first cell group 21 and the second cell group 22, and causing the battery pack 100 to output high voltage and low voltage with different voltage values.

[0034] By designing a battery pack 100 with variable output voltage, users no longer need to prepare multiple battery packs, which improves user convenience and work efficiency.

[0035] Furthermore, when the battery pack 100 outputs a high voltage, the first cell group 21 and the second cell group 22 are connected in series; when the battery pack 100 outputs a low voltage, the first cell group 21 and the second cell group 22 are connected in parallel.

[0036] Furthermore, multiple connecting pieces 51 are fixed to the housing 50, and the movement of the moving element 55 drives the switching element 52 to move, so as to switch between high voltage and low voltage.

[0037] In this embodiment, the connecting piece 51 includes a first connecting piece 511 connected to the main positive output terminal 41, a second connecting piece 512 connected to the second positive output terminal 221, a third connecting piece 513 connected to the first negative output terminal 212, a fourth connecting piece 514 connected to the main negative output terminal 42, and an intermediate connecting piece 510. Correspondingly, the switching element 52 has multiple components, and the switching element 52 includes a first set of switching elements 528 that changes the connection relationship between the first connecting piece 511, the second connecting piece 512, and the intermediate connecting piece 510, and a second set of switching elements 529 that changes the connection relationship between the fourth connecting piece 514, the third connecting piece 513, and the intermediate connecting piece 510.

[0038] The working principle of this battery pack 100 is as follows: Please see Figure 10 As shown, when the battery pack 100 outputs a high voltage, the first set of switching elements 528 is electrically connected between the second connecting piece 512 and the intermediate connecting piece 510, and the second set of switching elements 529 is electrically connected between the third connecting piece 513 and the intermediate connecting piece 510. Therefore, the second connecting piece 512 and the third connecting piece 513 are electrically connected through the common intermediate connecting piece 510, so as to connect the first negative output terminal 212 of the first cell group 21 to the second positive output terminal 221 of the second cell group 22, thereby realizing the series connection of the first cell group 21 and the second cell group 22. The first positive output terminal 211 is connected to the total positive output terminal 41, and the second negative output terminal 222 is connected to the total negative output terminal 42. At this time, the battery pack 100 outputs a high voltage of 40V.

[0039] Furthermore, when the battery pack 100 outputs a high voltage, there is no electrical conductivity between the first connecting piece 511 and the total positive output terminal 41, and there is no electrical conductivity between the fourth connecting piece 514 and the total negative output terminal 42.

[0040] Please see Figure 11 As shown, when the battery pack 100 outputs a low voltage, the first set of switching elements 528 is electrically connected between the first connecting piece 511 and the second connecting piece 512, the second set of switching elements 529 is electrically connected between the third connecting piece 513 and the fourth connecting piece 514, and the intermediate connecting piece 510 does not have a conductive function. The first positive output terminal 211 and the second positive output terminal 221 are simultaneously connected to the total positive output terminal 41, and the first negative output terminal 212 and the second negative output terminal 222 are simultaneously connected to the total negative output terminal 42, thereby realizing the parallel connection of the first cell group 21 and the second cell group 22. At this time, the battery pack 100 outputs a low voltage of 20V.

[0041] In this embodiment, both the first set of switching elements 528 and the second set of switching elements 529 have at least two switching elements 52 to achieve better conductivity.

[0042] In this embodiment, the first connecting piece 511 is located between the second connecting piece 512 and the intermediate connecting piece 510, and the fourth connecting piece 514 is located between the third connecting piece 513 and the intermediate connecting piece 510; while the intermediate connecting piece 510 spans the first connecting piece 511 and the fourth connecting piece 514, so that when the battery pack 100 outputs a high voltage, the first set of switching elements 528 and the second set of switching elements 529 can be simultaneously connected to the intermediate connecting piece 510.

[0043] Please combine Figure 9 As shown, the aforementioned housing 50 at least partially houses the connecting piece 51 and the switching element 52, while the movable element 55 extends outside the housing 50. Furthermore, the housing 50 has a first housing shell 53 and a second housing shell 54 connected to each other, and the first housing shell 53 and the second housing shell 54 are interlocked and fixed together to form an accommodating space, which houses the switching element 52 and the connecting piece 51. Further, the switching element 52 and the connecting piece 51 are respectively disposed within different housing shells; in this embodiment, the switching element 52 is movably disposed in the first housing shell 53, while the connecting piece 51 is fixedly disposed in the second housing shell 54.

[0044] In this embodiment, any one of the first connecting piece 511, the second connecting piece 512, the third connecting piece 513, and the fourth connecting piece 514 includes a first contact portion 515 housed within the housing 50, a second contact portion 516 exposed outside the housing 50, and a connection port 517 penetrating the second contact portion 516, while the intermediate connecting piece 510 is completely housed within the housing 50. The switching element 52 is connected to the first contact portion 515, and the total positive output terminal 41, the second positive output terminal 221, the first negative output terminal 212, and the total negative output terminal 42 are connected to their respective connecting pieces via the connection port 517.

[0045] Furthermore, the first contact portion 515 is located within the accommodating space, while the second contact portion 516 is exposed outside the accommodating space.

[0046] Furthermore, the aforementioned housing 50 has vents 541 in both the mounting area corresponding to the first contact portion 515 and the contact portion corresponding to the intermediate connecting piece 510. The vents 541 connect the interior and exterior of the housing 50. Since the first contact portion 515 is mounted on the second housing 54, and the first contact portion 515 generates heat during electrical conduction, the vents 541 are located in the second housing 54 to effectively dissipate heat from the first contact portion 515.

[0047] Please see Figure 5As shown, a connecting strip 23 is provided between the above-mentioned positive output terminal 41 and the first connecting piece 511, and between the positive output terminal 42 and the fourth connecting piece 514, and conductive connections are made through the connecting strip 23.

[0048] In this embodiment, the movable element 55 includes a base 551 for mounting the switching element 52, a rod 552 connected to the base 551, and a head 553 connected to the rod 552. The base 551 and the head 553 are located on both sides of the rod 552. Furthermore, the first housing 53 has a guide groove 531 for mounting the rod 552 and a channel 532 penetrating the guide groove 531. The rod 552 passes through the channel 532, and the base 551 is at least partially housed within the first housing 53.

[0049] Please see Figure 12 and Figure 13 As shown, the switching element 52 includes a main body 521, a pair of contacts 522 extending from the main body 521 toward the connecting piece 51, and a guide portion 523 and a pair of wings 524 extending from the main body 521 toward the base 551. The pair of contacts 522 are configured to connect any two of the plurality of connecting pieces 51. Correspondingly, the base 551 includes a pair of clamping arms 5511 spaced apart, a movable groove 5512 located between the pair of clamping arms 5511, and a positioning groove 5513 recessed from the end face of the clamping arms 5511. The main body 521 is received in the movable groove 5512.

[0050] Furthermore, the transformer assembly 5 includes a second elastic element 56 for the bias switching element 52. One end of the second elastic element 56 is received in the positioning groove 5513, and the other end of the second elastic element 56 is sleeved on the wing 524. The second elastic element 56 enables flexible contact between the switching element 52 and the connecting piece 51, which is beneficial to improving conductivity and extending the service life of the transformer assembly.

[0051] In this embodiment, the guide portion 523 is located between a pair of wings 524 and extends into the movable groove 5512. The length of the guide portion 523 extending toward the base 551 is greater than the length of the wings 524 extending toward the base 551, and the thickness of the guide portion 523 is slightly less than the width of the movable groove 5512. While the switching element 52 moves freely, the guide portion 523 has a guiding and limiting function.

[0052] Please see Figure 10As shown, the main body 521 has an extending axis X. The projection of the extending axis X onto the connecting piece 51 passes through the first connecting piece 511, the second connecting piece 512, and the intermediate connecting piece 510 simultaneously, or passes through the fourth connecting piece 514, the third connecting piece 513, and the intermediate connecting piece 510 simultaneously. Furthermore, the first set of switching elements 528 and the second set of switching elements 529 both move along the direction of the extending axis X, and the first set of switching elements 528 and the second set of switching elements 529 are arranged parallel to each other. The movement of the moving element 55 simultaneously drives the first set of switching elements 528 and the second set of switching elements 529 to move.

[0053] Please see Figure 9 and Figure 12 As shown, the transformer assembly 5 includes a first elastic member 58 of a bias moving element 55, a head 553 having a first positioning portion 5531 for mounting the first elastic member 58, and a first housing 53 having a second positioning portion 533 protruding from its end face. The first elastic member 58 is connected between the first positioning portion 5531 and the second positioning portion 533. Further, the first elastic member 58 is configured to abut against the moving element 55, so that the battery pack 100 outputs a high voltage when no external force is applied; when the head 553 of the moving element 55 is subjected to an external force and moves, the moving element 55 overcomes the elastic force of the first elastic member 58, causing the battery pack 100 to switch from a high voltage to a low voltage.

[0054] In this embodiment, the rod 552 includes a guide post 5522 protruding toward the first elastic member 58 and a relief groove 5523 recessed from the end face of the guide post 5522. The first elastic member 58 passes through the relief groove 5523, and the guide post 5522 plays a guiding and limiting role for the first elastic member 58.

[0055] In this embodiment, the rod 552 includes a mounting post 5521 protruding toward the head 553, and the head 553 is fitted onto the mounting post 5521. The head 553 and the rod 552 are detachably connected, and the head 553 is made of a material that is more wear-resistant than the rod 552. Optionally, the head 553 is made of a metal material. Optionally, the head 553 is made of an alloy material.

[0056] Please combine Figure 1 and Figure 2As shown, the aforementioned housing 1 has a through opening 13, which is located on the upper housing 11. The moving element 55 is configured to contact an external force through the opening 13, and the external force drives the moving element 55 to move, thereby switching the battery pack 100 between high and low voltage. Furthermore, the position of the head 553 of the moving element 55 corresponds to the position of the opening 13, and the head 553 extends through the opening 13 and is exposed to the outside of the housing 1 of the battery pack 100 through the opening 13, so that the head 553 can move under the action of an external force.

[0057] In this embodiment, when the battery pack 100 outputs a low voltage, at least part of the head 553 of the moving element 55 retracts into the opening 13.

[0058] Please see Figure 3 As shown, the opening 13 is adjacent to the terminal assembly 4, and the transformer assembly 5 is installed at the end of the cell assembly 2 near the terminal assembly 4.

[0059] Please see Figures 4 to 7 As shown, the transformer assembly 5 is connected to the cell support 24 of the cell assembly 2. The cell support 24 includes a first limiting part 241 and a second limiting part 242 supported at the upper and lower opposite ends of the housing 50, and a pair of claws 243 for fastening the housing 50. The pair of claws 243 are located between the first limiting part 241 and the second limiting part 242. The first limiting part 241 and the second limiting part 242 are used to position the housing 50, while the pair of claws 243 are used to hold the housing 50. In actual assembly, it is only necessary to align the two ends of the housing 50 of the transformer assembly 5 with the first limiting part 241 and the second limiting part 242, and press them firmly against the cell support 24. When the hooks 2431 of the pair of claws 243 hook the housing 50, the installation is completed.

[0060] Furthermore, the aforementioned first limiting part 241 is supported at the corner of the housing 50, and the shape of the first limiting part 241 matches the shape of the corner of the housing 50. In this embodiment, the corner shape of the housing 50 and the shape of the first limiting part 241 are arranged in an L-shape.

[0061] Please combine Figure 10As shown, the cell support 24 of the aforementioned cell assembly 2 further includes two partitions 244 protruding from its end face. These two partitions 244 are located vertically between two adjacent connecting pieces. Specifically, one partition 244 is located between the first connecting piece 511 and the second connecting piece 512, and between the first connecting piece 511 and the second positive output terminal 221. The other partition 244 is located between the fourth connecting piece 514 and the third connecting piece 513, and between the fourth connecting piece 514 and the first negative output terminal 212. The partitions 244 serve to separate the first connecting piece 511 from the second positive output terminal 221 and the second connecting piece 512, and to separate the fourth connecting piece 514 from the third connecting piece 513 and the first negative output terminal 212, thus providing insulation.

[0062] Please see Figures 14 to 16 As shown, the battery pack mounting base 220 has a first type of mounting base 228 and a second type of mounting base 229 with different structures. When the power tool 200 is equipped with the first type of mounting base 228, the battery pack 100 outputs a high voltage; when the power tool 200 is equipped with the second type of mounting base 229, the battery pack 100 outputs a low voltage. Furthermore, the power tool 200 equipped with the first type of mounting base 228 is a high-voltage powered tool, while the power tool 200 equipped with the second type of mounting base 229 is a low-voltage powered tool.

[0063] Specifically, the battery pack 100 is installed in the battery pack mounting base 220 along the front-to-back direction. The first type of mounting base 228 has a recessed slot 2280, which corresponds to the position of the opening 13 of the housing 1. When the battery pack 100 is installed in the first type of mounting base 228, the head 553 of the moving element 55 of the transformer assembly 5 passes through the opening 13 and extends into the slot 2280. At this time, the transformer assembly 5 does not cause the voltage of the battery pack 100 to switch, and the battery pack 100 outputs a high voltage. The second type of mounting base 229 has an abutment part 2290 at the position corresponding to the opening 13. When the battery pack 100 is installed in the second type of mounting base 229, the abutment part 2290 drives the head 553 of the moving element 55 to move, and drives the switching element 52 to move, so that the battery pack 100 automatically switches from high voltage to low voltage during the process of being plugged into the power tool 200.

[0064] It should be noted that the present invention does not limit the shape or structure of the abutment portion 2290, as long as the abutment portion 2290 can contact the moving element 55 of the transformer assembly 5 and drive the moving element 55 to move when the battery pack 100 is installed on the power tool 200 equipped with the second type of mounting base 229, thereby causing the voltage of the battery pack 100 to switch.

[0065] Please see Figure 16As shown, in this embodiment, the abutment portion 2290 is a flat structure on the second type of mounting base 229 corresponding to the position of the opening 13.

[0066] By differentiating the design of the battery pack mounting bracket 220 of the power tool 200, and by allowing the power tool 200 to select either high-voltage or low-voltage input according to the needs of the application, and thus selecting either the first type mounting bracket 228 or the second type mounting bracket 229, the battery pack 100 can be installed in either the first type mounting bracket 228 or the second type mounting bracket 229 without restriction. This effectively constructs a low-cost power tool combination 300 with a good user experience. In addition, when the battery pack 100 is installed in the power tool 200, the output voltage of the battery pack 100 is automatically switched, requiring no additional action from the user, making operation simpler.

[0067] Please see Figure 4 , Figure 6 and Figure 9 As shown, the terminal assembly 4 extends along the front-rear direction and is located in the area near the front. The battery pack 100 is also inserted into the power tool 200 along the front-rear direction. The housing 50 is mounted on the front end of the cell support 24 near the terminal assembly 4, and the moving element 55 moves along the vertical direction. Therefore, the moving direction of the moving element 55 is perpendicular to the insertion direction of the battery pack 100. Furthermore, the insertion direction of the second type of mounting base 229 is also perpendicular to the movement direction of the head 553.

[0068] Please combine Figure 9 As shown, the head 553 has a guide portion 5531 that is inclined relative to the front-back direction. When an external force is applied to the head 553 in the front-back direction, the moving element 55 is driven to move in the up-down direction via the guide portion 5531. Furthermore, when the battery pack 100 is installed in the front-back direction onto the power tool 200 equipped with the second type of mounting base 229, the abutment portion 2290 drives the head 553 to move in the up-down direction along the guide portion 5531, thereby causing the battery pack 100 to switch from high voltage to low voltage.

[0069] In this embodiment, when the battery pack 100 is installed on the power tool 200, the transformer assembly 5 prioritizes switching the output voltage of the cell assembly 2 before the battery pack 100 and the power tool 200 are electrically connected, and the battery pack 100 then supplies power to the power tool 200. This is because, especially when the battery pack 100 is plugged into the power tool 200 equipped with the second type mounting base 229, the battery pack 100 defaults to outputting a high voltage. If the battery pack 100 and the power tool 200 were electrically connected first, the high voltage output of the battery pack 100 would inevitably damage the electronic components of the power tool 200, posing a significant safety hazard. This invention, by prioritizing the voltage switching of the transformer assembly 5 before establishing electrical connection between the battery pack 100 and the power tool 200, helps to extend the lifespan of the power tool 200 and improve the safety of the battery pack 100.

[0070] Therefore, when the battery pack 100 is not installed on the power tool 200 equipped with the second type of mounting base 229, the battery pack 100 outputs a high voltage; when the battery pack 100 is installed on the power tool 200 equipped with the second type of mounting base 229, the battery pack 100 outputs a low voltage. Furthermore, the abutment portion 2290 first contacts the moving element 55 and drives the moving element 55 to move, thereby achieving voltage switching of the battery pack 100; subsequently, the tool terminal 2291 contacts the terminal assembly 4 and achieves electrical conduction with the terminal assembly 4, thereby achieving electrical conduction between the battery pack 100 and the power tool 200, which helps to extend the service life of the power tool 200.

[0071] Please see Figures 17 to 24 As shown, in the second embodiment of the present invention, the overall structure of the battery pack 100' is substantially the same as that of the battery pack 100 in the first embodiment.

[0072] Furthermore, the battery pack 100' also includes a housing 1', a cell assembly 2' installed within the housing 1', a control assembly 3' connected to the cell assembly 2', a terminal assembly 4' connected to the control assembly 3', and a transformer assembly 5' for switching the output voltage of the cell assembly 2'. The terminal assembly 4' extends in the front-rear direction and is located on the upper side of the cell assembly 2', while the transformer assembly 5' is also located on the upper side of the cell assembly 2'. Furthermore, the control assembly 3' is installed on the upper side of the cell assembly 2', and both the terminal assembly 4' and the transformer assembly 5' are installed on the upper side of the control assembly 3'.

[0073] Please see Figure 20As shown, the transformer assembly 5' includes a housing 50' disposed on the upper side of the cell assembly 2' and a moving element 55' movably connected to the housing 50'. An opening 13' is provided on the housing 1', through which the moving element 55' extends and is exposed to the outside of the housing 1'. In this embodiment, the moving direction of the moving element 55' is parallel to the insertion direction of the battery pack 100', that is, the moving element 55' moves along the front-back direction. This is advantageous for triggering the transformer assembly 5', because when the battery pack 100' is inserted into the power tool along the front-back direction, the contact portion of the battery pack 100' moves along the front-back direction, and the force exerted by the contact portion along the front-back direction directly drives the moving element 55' to move along the front-back direction, resulting in a more stable and reliable structure.

[0074] Please combine Figure 21 and Figure 22 As shown, the housing 50' is located behind the terminal assembly 4', and the moving element 55' extends through the terminal assembly 4' in the front-rear direction and extends to the front of the terminal assembly 4'. Furthermore, the length of the battery pack 100' in the front-rear direction depends on the length of the cell assembly 2' in the front-rear direction, while the height of the battery pack 100' in the vertical direction depends on the height of the terminal assembly 4' in the vertical direction, particularly the top height of the terminal assembly 4'. Therefore, by configuring the transformer assembly 5' in the front-rear direction between the front and rear ends of the cell assembly 2', and configuring the upper side of the transformer assembly 5' to be no higher than the upper side of the terminal assembly 4', it is beneficial to the miniaturization and compactness of the battery pack 100'.

[0075] In this embodiment, the upper side of the housing 50' and the moving element 55' is not higher than the upper side of the terminal assembly 4', the housing 50' is located between the rear end of the cell assembly 2' and the rear end of the terminal assembly 4' in the front-rear direction, and the front side of the moving element 55' does not exceed the front side of the cell assembly 2'.

[0076] Please see Figure 23 As shown, the projections of the housing 50' and the terminal assembly 4' onto the control assembly 3' are within the projection range of the control assembly 3', in order to further achieve miniaturization and compactness of the battery pack 100'.

[0077] Please combine Figure 21 and Figure 24 As shown, the terminal assembly 4' includes a terminal base 40', several output terminals housed in the terminal base 40', and a channel 43' extending through the terminal base 40' in the front-rear direction. The moving element 55' passes through the channel 43', thereby facilitating the normal movement of the moving element 55'. Furthermore, the channel 43' is formed by removing material from the terminal base 40'.

[0078] In this embodiment, the moving element 55' includes a base 551' connected to the housing 50', a first rod 554' connected to the base 551', a second rod 555' connected to the first rod 554', and a contact surface 556' formed at the joint position of the first rod 554' and the second rod 555'. The second rod 555' passes through the channel 43', and the first rod 554' and the contact surface 556' are located on the rear side of the terminal block 40'.

[0079] In this embodiment, several output terminals include a total positive output terminal 41' and a total negative output terminal 42' that output the power of the battery cell assembly 2' to the outside. The second rod body 555' is made of insulating material. The total positive output terminal 41' and the total negative output terminal 42' are located on both sides of the second rod body 555', thereby enabling the battery pack 100' to have good insulation performance.

[0080] Please combine Figure 23 and Figure 24 As shown, the housing 50' has a first housing 53' and a second housing 54' connected to each other. The first housing 53' includes a connector 535' for mounting to the control component 3' and a mounting hole 536' through the connector 535'. A screw 59' passes through the mounting hole 536', the control component 3' and the battery cell assembly 2' in sequence, thereby better fixing the housing 50'.

[0081] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

1. A battery pack, coupled to a power tool and configured to supply power to the power tool; the battery pack includes a housing, a cell assembly mounted within the housing, and a terminal assembly for outputting power from the cell assembly to the outside, the power tool including a tool terminal electrically connected to the terminal assembly; characterized in that: The battery cell assembly includes a first battery cell group and a second battery cell group connected to each other. The battery pack includes a transformer assembly for switching the output voltage of the battery cell assembly. The transformer assembly is configured to change the electrical connection relationship between the first battery cell group and the second battery cell group so that the battery pack outputs high voltage and low voltage values. The transformer assembly includes a movable element, the housing has a through opening, the power tool includes an abutment corresponding to the movable element, the movable element is configured to contact the abutment via the opening, and the abutment drives the movable element to move, thereby causing the battery pack to switch between the high voltage and the low voltage; When the battery pack is installed on the power tool, the abutment portion first contacts the moving element and drives the moving element to move, and then the tool terminal contacts the terminal assembly and achieves electrical conduction with the terminal assembly.

2. The battery pack according to claim 1, characterized in that: When the battery pack is not installed in the power tool, the battery pack outputs a high voltage; when the battery pack is installed in the power tool, the battery pack outputs a low voltage.

3. The battery pack according to claim 1 or 2, characterized in that: The transformer assembly includes a first elastic element that biases the moving element, the first elastic element being configured to abut against the moving element such that the battery pack outputs the high voltage when the moving element is not subjected to the force of the abutment. When the moving element is subjected to the force of the abutment and moves, the moving element overcomes the elastic force of the first elastic member and causes the battery pack to switch from the high voltage to the low voltage.

4. The battery pack according to claim 1 or 2, characterized in that: The opening is adjacent to the terminal assembly, and the movable element is exposed to the outside of the battery pack via the opening.

5. The battery pack according to claim 4, characterized in that: When the battery pack outputs the low voltage, at least a portion of the moving element retracts into the opening.

6. The battery pack according to claim 1, characterized in that: The transformer assembly includes a switching element connected to the moving element, a plurality of connecting pieces connected to the cell assembly, and a housing that at least partially houses the connecting pieces and the switching element. The moving element is movably connected to the housing, and the switching element is connected to the connecting pieces. The movement of the moving element drives the switching element to move.

7. The battery pack according to claim 6, characterized in that: The terminal assembly extends in the front-to-back direction, the housing is mounted on the front end of the cell assembly near the terminal assembly, and the moving element moves in the up-down direction.

8. The battery pack according to claim 6, characterized in that: The terminal assembly extends in the front-to-back direction, the housing is located on top of the cell assembly, and the movable element moves in the front-to-back direction.

9. The battery pack according to claim 8, characterized in that: The housing is located behind the terminal assembly, and the upper side of the housing is not higher than the upper side of the terminal assembly.

10. The battery pack according to claim 9, characterized in that: The movable element extends through the terminal assembly and extends to the front side of the terminal assembly.

11. The battery pack according to claim 10, characterized in that: The terminal assembly includes a terminal block, a plurality of output terminals housed in the terminal block, and a channel extending through the terminal block in a front-to-back direction, wherein the movable element passes through the channel.

12. A battery pack, coupled to a power tool and configured to supply power to the power tool; the battery pack includes a housing, a cell assembly mounted within the housing, a control assembly connected to the cell assembly, and a terminal assembly for outputting power from the cell assembly to the outside, the terminal assembly being connected to the control assembly, and the power tool including a tool terminal electrically connected to the terminal assembly; characterized in that: The battery pack includes a transformer assembly for switching the output voltage of the cell assembly, the output voltage including high voltage and low voltage of different values, the transformer assembly including a movable element, the housing having a through opening, the power tool including an abutment portion corresponding to the movable element, the movable element being configured to contact the abutment portion via the opening, and the abutment portion driving the movable element to move, thereby causing the battery pack to switch between high voltage and low voltage; When the battery pack is installed on the power tool, the transformer assembly first switches the output voltage of the cell assembly, and then the battery pack and the power tool are electrically connected.

13. A power tool assembly comprising a power tool and a battery pack interconnected; the power tool including a housing, a drive assembly mounted within the housing, and an output head connected to the drive assembly, the battery pack providing power to the drive assembly, and the housing including a battery pack mounting base for mounting the battery pack; characterized in that: The battery pack is the battery pack described in any one of claims 1-12 above, and the abutting portion is disposed on the battery pack mounting base.

14. The power tool assembly according to claim 13, characterized in that: The battery pack mounting base has a first type of mounting base and a second type of mounting base with different structures. When the power tool is mounted on the first type of mounting base, the battery pack outputs the high voltage; when the abutment part is provided on the second type of mounting base, the battery pack outputs the low voltage.

15. The power tool assembly according to claim 14, characterized in that: The first type of mounting base has a recessed slot that corresponds to the opening of the housing. When the battery pack is installed in the first type of mounting base, the moving element of the transformer assembly passes through the opening and extends into the slot.

16. The power tool assembly according to claim 15, characterized in that: The battery pack is installed in the battery pack mounting base along the front-to-back direction. The moving direction of the moving element is perpendicular to the insertion direction of the battery pack, or the moving direction of the moving element is parallel to the insertion direction of the battery pack.

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