Multi-voltage battery pack and electric tool

Abstract

The invention relates to a multi-voltage battery pack and an electric tool, the multi-voltage battery pack comprises a battery pack and a voltage switching mechanism, the battery pack comprises at least two battery packs, and the voltage switching mechanism comprises a first terminal seat and a second terminal which are fixed to the battery pack. The third terminal seat and the fourth terminal seat are fixed to the electric tool; wherein the first terminal seat is coupled with the fourth terminal seat to obtain an output voltage, the second terminal is matched with the third terminal seat to realize electric connection, and the third terminal seat comprises a plurality of third terminals and at least one connecting sheet; the multi-voltage battery pack is set to have different output voltages when the connecting piece is selectively connected with different third terminals; the voltage switching mechanism has the advantages of being simple in structure, convenient to disassemble, assemble and replace, high in convenience and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a multi-voltage battery pack and an electric tool. Background Art

[0002] Currently, more and more power tools use batteries as power sources, forming battery-powered power tools without power cords. Different power tools usually require different voltages and currents. In order to improve the versatility of batteries, some battery packs add a voltage switching mechanism inside the battery pack, and realize the electrical connection between different terminal groups inside the battery pack by switching the voltage switching mechanism. In this case, the internal structure of the battery pack is complex, with many parts, and most of the parts are movable connections. When the battery pack collides or falls, it is easy to cause the internal parts to be misaligned or damaged, and the switching mechanism is prone to malfunction, affecting normal use. In addition, when repairing or replacing the switching mechanism, the battery pack needs to be disassembled, which lacks convenience. Summary of the invention

[0003] The object of the present invention is to provide a multi-voltage battery pack, the voltage switching mechanism of which has the advantages of simple structure, convenient disassembly and replacement, and high convenience.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A multi-voltage battery pack, comprising:

[0006] A battery pack, the battery pack comprising a housing and a battery cell assembly, the housing having a space for accommodating the battery cell assembly, the battery cell assembly comprising at least two battery packs;

[0007] A voltage switching mechanism, the voltage switching mechanism is electrically connected to the plurality of battery packs, the voltage switching mechanism comprises a first terminal seat and a second terminal seat fixed to the battery pack, and a third terminal seat and a fourth terminal seat fixed to the power tool; wherein the first terminal seat is coupled with the fourth terminal seat to obtain an output voltage, the second terminal seat is matched with the third terminal seat to achieve electrical connection, and the third terminal seat comprises a plurality of third terminals and at least one connecting piece;

[0008] The multi-voltage battery pack is configured such that when the connecting piece is selectively connected to different third terminals, the battery pack has different output voltages.

[0009] In one embodiment, the connecting piece is non-movably connected to the third terminal.

[0010] In one embodiment, the second terminal base includes a plurality of second terminals, each of the second terminals is immovably fixed inside the housing, and each of the second terminals is in contact with one of the third terminals.

[0011] In one embodiment, the second terminal includes a second female terminal and a second male terminal, the second female terminal is immovably fixed to the battery cell assembly, the second male terminal is immovably fixed to the housing, and the second male terminal is electrically connected to the second female terminal.

[0012] In one embodiment, the second male terminal includes a second contact segment and a second extension segment, the outer side of the second contact segment is used to contact with the third terminal to achieve electrical connection, the second extension segment extends on the inner side of the second contact segment in a direction toward the second female terminal, and the second extension segment is inserted into the second female terminal.

[0013] In one embodiment, the housing is provided with a first window in a region corresponding to the second contact segment, and the second contact segment contacts the third terminal through the first window.

[0014] In one embodiment, the third terminal includes a third contact segment, and the third contact segment contacts the second contact segment.

[0015] In one embodiment, the first terminal block includes a plurality of first terminals, the fourth terminal block includes a plurality of fourth terminals, each of the first terminals is immovably fixed to the battery pack, each of the fourth terminals is immovably fixed to the power tool, and each of the first terminals is in contact with one of the fourth terminals.

[0016] In one embodiment, the first terminal and the fourth terminal are one of a male terminal and a female terminal that are matched with each other.

[0017] In one embodiment, the housing is provided with a second window in a region corresponding to the first terminal, and the first terminal contacts the fourth terminal through the second window.

[0018] In one embodiment, the first terminal includes a first terminal A, a first terminal B, a first terminal C and a first terminal C+, wherein the first terminal A and the first terminal B output a first voltage, the first terminal A and the first terminal C output a second voltage, and the first terminal B and the first terminal C+ are charging ports.

[0019] In one embodiment, the first terminal block, the second terminal block, the third terminal block and the fourth terminal block do not include movable parts.

[0020] The present invention also provides an electric tool, comprising an electric tool body and a power source, wherein the electric tool body comprises a casing having a cavity for assembling the power source, and the power source is any of the multi-pressure battery packs described above.

[0021] In one embodiment, the third terminal seat and the fourth terminal seat are fixedly mounted on the inner wall of the cavity, and the first terminal seat and the second terminal seat are positioned on the battery pack opposite to the third terminal seat and the fourth terminal seat, respectively.

[0022] In one embodiment, the power supply is inserted into the cavity along a straight line, the first terminal seat is closer to the insertion end than the second terminal seat, the first terminal seat is plug-fitted with the fourth terminal seat, and the second terminal is in contact with the third terminal seat.

[0023] In one embodiment, the housing is provided with a first slot and a second slot matched with the third terminal seat and the fourth terminal seat, and the third terminal seat and the fourth terminal seat are respectively fixed in the first slot and the second slot in an immovable manner.

[0024] The present invention adopts the above-mentioned technical scheme, which has the beneficial effect that the multi-voltage battery pack provided by the present invention sets the voltage switching mechanism on the battery pack and the electric tool in an immovable manner. On the one hand, the arrangement of components inside the battery pack is reduced, and the components inside the battery pack are fixedly connected. When an accident occurs, the components are not easily damaged, which improves the safety and stability of the battery pack and extends the service life. On the other hand, the switching part of the voltage switching mechanism is directly and separately set on the electric tool, which has a simple structure, is convenient for disassembly and replacement, and is highly convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a multi-pressure battery pack being mounted on the housing of a power tool.

[0026] Figure 2 yes Figure 1 sectional view of .

[0027] Figure 3 This is a schematic diagram of the multi-pressure battery pack after removing the upper shell.

[0028] Figure 4 yes Figure 3 Top view of the .

[0029] Figure 5 It is a schematic diagram of the front side of the upper shell of the multi-pressure battery pack.

[0030] Figure 6 It is a schematic diagram of the battery cell assembly.

[0031] Figure 7 It is a schematic diagram of the left shell of the multi-pressure battery pack.

[0032] Figure 8 It is a schematic diagram of the right shell of the multi-pressure battery pack.

[0033] Fig. 9 is a schematic diagram of the first terminal.

[0034] Fig.10 Schematic diagram of the fourth terminal block.

[0035] Fig.11 is a schematic diagram of the second terminal.

[0036] Fig.12 is a schematic diagram of the second male terminal.

[0037] Fig.13 This is a schematic diagram of the third terminal block with the base removed.

[0038] Fig.14 This is a schematic diagram of the third terminal holder from another perspective after the base is removed.

[0039] Fig.15 This is a schematic diagram of the third terminal block in parallel state.

[0040] Fig.16 It is a schematic diagram of the third terminal block in the series state.

[0041] Fig.17a This is the circuit diagram of the battery pack in idle state.

[0042] Fig.17b This is the circuit diagram of the battery pack in the 40V discharge state.

[0043] Fig.17c This is the circuit diagram of the battery pack in the 80V discharge state.

[0044] Fig.17d This is the circuit diagram of the battery pack in the 40V charging state.

[0045] Fig.18 It is a schematic diagram of the back side of the upper shell of the multi-pressure battery pack.

[0046] Fig.19 It is a schematic diagram of the casing of the power tool.

[0047] Fig. 20 is a schematic diagram of the third terminal.

[0048] Fig.21 is a schematic diagram of a base of the third terminal holder.

[0049] Fig. 22 Schematic diagram of the cover of the third terminal seat.

[0050] Fig.23 It is a schematic diagram of the right half of the casing of the power tool.

[0051] Fig.24It is a schematic diagram of a multi-voltage battery pack.

[0052] Fig.25 This is a schematic diagram showing the protective cover on the multi-pressure battery pack exposing the first window.

[0053] Fig.26 It is a schematic diagram showing that the protective cover on the multi-pressure battery pack covers the first window.

[0054] Fig. 27 It is a partial cross-sectional schematic diagram of the contact between the second terminal seat and the third terminal seat.

[0055] Fig.28 is a schematic diagram of the protective cover.

[0056] Fig.29 is a schematic diagram of the installation parts.

[0057] Fig.30 is a side view of the third terminal block. DETAILED DESCRIPTION

[0058] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0059] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0060] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0061] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0062] As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0063] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0064] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0065] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] The present invention provides a multi-voltage battery pack, which sets a voltage switching mechanism on the battery pack and the electric tool in an immovable manner. On the one hand, the arrangement of components inside the battery pack is reduced, and the components inside the battery pack are fixedly connected. When an accident occurs, the components are not easily damaged, thereby improving the safety and stability of the battery pack and extending the service life. On the other hand, the switching part of the voltage switching mechanism is directly and separately set on the electric tool, which has a simple structure, is easy to disassemble and replace, and is highly convenient.

[0067] refer to Figure 1-Figure 30 The multi-voltage battery pack includes a battery pack and a voltage switching mechanism, wherein the battery pack has at least two relatively independent battery packs, and the voltage switching mechanism realizes the output of multiple voltages by switching the series and parallel connection of these battery packs.

[0068] The battery pack 1 includes a housing and a battery cell assembly fixedly installed inside the housing. Figure 1-Figure 6 The housing 10 of the battery pack 1 is composed of a left housing 101, a right housing 102 and an upper housing 103. The left housing 101 and the right housing 102 are fixed by bolts to form a cell cavity for assembling a cell assembly.

[0069] The battery cell assembly includes a plurality of battery cells 110 and a circuit board 13. The battery cells 110 are fixedly mounted on a battery cell holder 12, and the battery cells are divided into two battery groups, namely a first battery group 11a and a second battery group 11b. Each battery group is electrically connected to the corresponding positive and negative electrodes 14 on the circuit board 13 through a conductive object such as a wire. The first battery group 11a and the second battery group 11b generally have the same voltage and current output capabilities, but for some different requirements, each battery group in the battery pack 1 may also have different voltage and current output capabilities.

[0070] refer to Figure 5 and Figure 7-Figure 8 The left shell 101 and the right shell 102 form a slot 104 around the opening of the battery cell cavity. The slot 104 is arranged in cooperation with the edge of the upper shell 103. The edge of the upper shell 103 can be inserted into the slot 104, so that the upper shell 103 can be fixed at the opening of the battery cell cavity by the left shell 101 and the right shell 102. The left shell 101 and the right shell 102 are respectively provided with positioning columns 105 that are arranged in cooperation with each other. The positioning columns 105 enable the right shell 102 to be positioned and installed on the left shell 101, and then fixedly connected to the right shell 102 by screws in the positioning columns of the left shell 101. Preferably, the upper shell 103 has a fixing through hole 1031 that penetrates the upper shell 103 along the left-right direction. The size of the fixing through hole 1031 is matched with the size of the corresponding positioning column 105, and the position of the fixing through hole 1031 is corresponding to the position of the corresponding positioning column 105. When the left shell 101 and the right shell 102 are fixed together, the positioning column 105 passes through the fixing through hole 1031 to further fix the upper shell 103.

[0071] refer to Figure 2 as well as Figure 7 and Figure 8 The inner side walls of the left shell 101 and the right shell 102 are respectively provided with limiting ribs 106 that cooperate with the battery holder 12, and the battery holder 12 is limited in the battery cavity by these limiting ribs.

[0072] The voltage switching mechanism includes a first terminal seat 21 and a second terminal seat 22 fixed on the battery pack 1 , and a third terminal seat 23 and a fourth terminal seat 24 fixed on the housing 3 of the electric tool.

[0073] Specifically, refer to Figure 2-Figure 4 The first terminal seat 21 includes a plurality of first terminals 211 fixed on the circuit board 13 of the battery pack 1. The first terminals in this embodiment include five ports, namely, first terminals A, B, C, C+, and signal ports. The first terminals A, B, C, and C+ are responsible for charging and discharging the battery pack, and the signal port is responsible for signal communication.

[0074] refer to Fig. 9 The multiple first terminals 211 on the first terminal seat 21 are all first female terminals with an insertable portion. The first terminal 211 is made of a metal spring sheet material, and the metal spring sheet is bent to form a roughly Y-shaped insertable portion, so that the inserted male terminal part can stably contact the first terminal 211.

[0075] refer to Fig.10 The fourth terminal seat 24 includes a plurality of fourth terminals 241 corresponding to the first terminals A, B, C, C+, and the signal port of the first terminal seat 21. Each fourth terminal contacts one of the corresponding first terminals to achieve electrical contact between the first terminal and the fourth terminal. Finally, the voltage is output by electrically connecting the first terminal seat 21 on the battery pack 1 with the fourth terminal seat 24 on the power tool. The fourth terminal 241 of the fourth terminal seat 24 is a fourth male terminal matching the first female terminal. The fourth male terminal has a straight-line insertion portion matching the insertable portion of the first terminal 211. When the insertion portion of the fourth terminal 241 is inserted into the insertable portion of the first terminal 211, the first terminal 211 clamps the insertion portion of the fourth terminal 241 through the elastic deformation of the metal spring sheet itself, so that the fourth terminal 241 forms a stable electrical contact with the first terminal 211.

[0076] refer to Figure 4-Figure 6 and Figure 11-Figure 12 The second terminal seat 22 includes a plurality of second terminals 220. Each of the second terminals 220 includes a second male terminal 221 and a second female terminal 222. The second female terminal 222 is fixed to the circuit board 13 of the battery pack 1, and the second male terminal 221 is fixed to the upper shell 103. Specifically, the second male terminal 221 includes a second contact section 2211, a second bending section 2212, a second fixed section 2213, and a second extension section 2214. The second bending section 2212 is used to connect the second contact section 2211 with the second fixed section 2213. The outer side of the second contact section 2211 is used to contact with the third terminal to achieve electrical connection. The second extension section 2214 extends longitudinally along the direction of the second female terminal 222 on the inner side of the second contact section 2211. The second extension section 2214 is inserted into the second female terminal 222 to achieve electrical connection.

[0077] refer to Figure 5 , Fig.12 and Fig.18The upper shell 103 has a first window 1032 in the area corresponding to the second contact section 2211 of each second male terminal 221. Each first window 1032 is used to expose the second contact section 2211 of the corresponding second male terminal 221, so that the third terminal 231 can contact the second contact section 2211 to achieve electrical connection. The outer side of the second contact section 2211 is basically located in the same plane as the outer side of the upper shell 103 or slightly lower than the plane of the upper shell, preferably slightly lower than the plane of the upper shell, that is, the outer side of the second contact section 2211 is located in the first window 1032 and does not exceed the first window 1032. When the battery pack 1 is inserted into the power tool, it can play a certain positioning effect on the position of the third terminal 231.

[0078] A connection portion 1033 extending longitudinally along the direction of the battery cell is provided on the inner wall of the upper housing 103 at a position corresponding to the second fixing section 2213 of each second male terminal 221, and a connection hole 2215 matching the connection portion 1033 is provided on the second fixing section 2213, and the second male terminal 221 is fixed to the upper housing 103 by the fixed connection between the connection portion 1033 and the connection hole 2215. The connection portion 1033 in this embodiment is a plastic column, and the second male terminal 221 is fixedly installed on the upper housing 103 by a hot riveting process after the connection portion 1033 passes through the corresponding connection hole 2215. In order to ensure the firmness of the connection between the second male terminal 221 and the upper housing 103, a plurality of connection portions 1033 and connection holes 2215 may be provided correspondingly.

[0079] Refer to Figure 5-Figure 6 as well as Figure 18-19 The upper shell 103 is provided with a second window 1034 at the position corresponding to each first terminal 211, and the fourth terminal 241 of the fourth terminal seat 24 can extend into the corresponding second window 1034 to contact the corresponding first terminal 211 to achieve electrical contact, or the first terminal 211 can extend from the corresponding second window 1034 to the outside of the upper shell 103 to make electrical contact with the corresponding fourth terminal 241. It is preferred that the first terminal 211 is located in the upper shell 103, and the fourth terminal 241 extends from the second window 1034 into the upper shell 103 to make contact with the corresponding first terminal 211, so that the first terminal 211 can be located inside the shell, avoiding accidental contact with the first terminal 211 during use, thereby improving safety.

[0080] The assembly method of the battery pack 1 is as follows:

[0081] 1) The plurality of battery cells 110 are fixedly mounted on the battery cell holder 12 and connected to the circuit board 13 to form a battery cell assembly. The plurality of first terminals 211 of the first terminal holder 21 and the plurality of second female terminals 222 of the second terminal holder 22 can be pre-fixed on the circuit board 13, and the second male terminal 221 of the second terminal holder 22 can be pre-fixed on the upper housing 103.

[0082] 2) The second extension section 2214 of the second male terminal 221 is inserted into the second female terminal 222 on the battery cell assembly, so that the upper housing is positioned and installed on the battery cell assembly.

[0083] 3) The battery cell assembly and the upper housing 103 are installed into the right housing 102 through the limiting ribs 106 and the slots 104 .

[0084] 4) The right housing 102 is positioned and installed on the left housing 101 through the positioning column 105, and finally fixed to the right housing through screws in the positioning column of the left housing 101 to complete the assembly of the battery pack.

[0085] refer to Figure 13-Figure 16 , the third terminal seat 23 includes a third terminal 231 and a connecting piece 232. The number of the third terminals 231 corresponds to the number of the second male terminals 221 on the second terminal seat 22. The second male terminal 221 in this embodiment includes second male terminals a, b, c, d, and correspondingly, the third terminal 231 includes third terminals a, b, c, d, and each third terminal contacts the outer side of the second contact section 2211 of one of the corresponding second male terminals to achieve electrical contact between the third terminal and the second male terminal. The connecting piece 232 connects different third terminals to achieve voltage switching of the battery pack 1.

[0086] In this embodiment, when the third terminals a and b, c and d on the third terminal seat 23 are connected in pairs through the connecting piece, the first battery pack 11a and the second battery pack 11b are in parallel state, and the first terminals A and B of the first terminal seat 21 output the first voltage, and the output voltage is 40V. When the third terminals a and d on the third terminal seat are connected through the connecting piece, and b and c are left vacant, the first battery pack 11a and the second battery pack 1 are in series state, and the first terminals A and C of the first terminal seat of the battery pack output the second voltage, and the output voltage is 80V. The circuit diagrams of the battery pack in the idle state, 40V discharge state and 80V discharge state are respectively shown in Fig.17a , Fig.17b and Fig.17cTherefore, when the multi-voltage battery pack switching system is used, the first terminal seat 21 and the second terminal seat 22 are fixed on the circuit board 13 of the battery pack 1 in an immovable manner, and the third terminal seat 23 and the fourth terminal seat 24 are fixed on the power tool in an immovable manner. At the same time, the corresponding connecting piece is selected according to the voltage requirement of the power tool to connect with the corresponding third terminal to realize the corresponding voltage output, wherein the third terminal seat 23 and the fourth terminal seat 24 as the voltage switching mechanism are directly and separately arranged on the power tool, with a simple structure, convenient disassembly and replacement, and high convenience. In addition, the multi-voltage battery pack switching system reduces the arrangement of components inside the battery pack, and the components inside the battery pack are fixedly connected. When an accident occurs, the components are not easily damaged, which improves the safety and stability of the battery pack and extends the service life.

[0087] In this embodiment, the first terminal seat 21 also has a charging port C+. When the battery pack is charged, a 40V voltage is used for charging. At this time, the first terminals B and C+ of the first terminal seat of the battery pack are charging ports. Fig.17d Since port A is the discharge output port with a large output current, and port C+ has a small current when charging, the charging circuit is equipped with circuit protection components such as MOS, which are easy to burn when the current is too large. Therefore, ports A and C+ need to be set separately.

[0088] refer to Figure 1-Figure 2 as well as Fig.19 The electric tool has a cavity 30. The figure does not show the complete external structure of the electric tool, but only shows the external structure of the electric tool for assembling the battery pack. The cavity 30 matches the external structure of the battery pack 1. At least a portion of the battery pack 1 can be inserted into the cavity 30, and the first terminal 211 of the first terminal seat 21 on the battery pack 1 is electrically contacted with the fourth terminal 241 of the fourth terminal seat 24 on the electric tool. At the same time, the second terminal 220 of the second terminal seat 22 on the battery pack 1 is electrically contacted with the third terminal 231 of the third terminal seat 23 on the electric tool. The electric tool can obtain the working voltage by electrically connecting with the fourth terminal seat 24. In this embodiment, the battery pack 1 moves in the front-to-back direction and is assembled into the cavity 30 of the electric tool.

[0089] refer to Figure 20-Figure 22 The third terminal 231 includes a third contact segment 2311, a third curved segment 2312 and a third fixed segment 2313. The third fixed segment 2313 is located at both ends of the third contact segment 2311, and the third curved segment 2312 is used to connect the third contact segment 2311 and the third fixed segment 2313.

[0090] The third terminal seat 23 also includes a base 233 and a cover 234, and the base 233 and the cover 234 cooperate to form a cavity for fixing the third terminal 231. The base 233 and the cover 234 are fixedly connected by screws. The base 233 is provided with a plurality of first mounting grooves 2331 for mounting the third terminal 231, and the third fixing section 2313 of the third terminal 231 is provided with a third positioning column 2314 matching the first mounting groove 2331. The third positioning column 2314 positions and mounts the third terminal 231 in the first mounting groove 2331, and the plurality of third terminals 231 of the third terminal seat 23 are arranged in the cavity in sequence.

[0091] Specifically, first elastic members 2332 are also placed in the first mounting grooves 2331. The height of the first elastic members 2332 in the natural state without external compression is greater than the depth of the first mounting grooves 2331 (the figure shows a compressed spring). The first elastic member 2332 in this embodiment is a spring member, and the third positioning column 2314 is sleeved in the spring member, so that the spring member generates elastic force on the third terminal 231, and the elastic force makes the third terminal 231 and the second male terminal 221 contact more tightly. In one embodiment, the heights of the multiple first elastic members 2332 arranged in each first mounting groove 2331 are consistent. In another embodiment, the height of the first elastic member on the same side of the third terminal seat is inconsistent with the height of the first elastic member on the other side, so that the third terminal is in an inclined state when in contact with the second male terminal, and the side with greater elastic force fits more tightly when in contact.

[0092] In order to increase the tightness of the contact between the third terminal and the second male terminal, a plurality of protrusions may be provided on the third contact segment 2311. In addition, the third contact segment 2311 of the third terminal and the second contact segment 2211 of the second male terminal may be plated with a chrome layer on the surface of the contact segment by a chrome plating process to increase the hardness of the contact surface and reduce the degree of wear of the contact surface.

[0093] refer to Fig.13 and Fig. 20 A connecting column 2315 is also provided on the inner side of the third contact section 2311. The connecting column 2315 has a screw hole. The connecting piece 232 has a fixing hole matching the connecting column 2315. The connecting piece 232 is fixedly connected to the third terminal 231 by a screw that passes through the fixing hole and is screwed to the connecting column 2315.

[0094] refer to Fig. 22The cover body 234 is provided with a plurality of through holes 2341 for exposing the third contact segment 2311 at a position corresponding to the third contact segment 2311 of the third terminal 231. The outer side of the third contact segment 2311 is used to expose the through hole 2341 to contact the second male terminal 221 to achieve electrical connection. The inner side of the cover body 234 is also provided with a plurality of limiting cavities 2342, which are matched with the third fixing segment 2313 of the third terminal and are used to limit and fix the third terminal 231.

[0095] refer to Fig.23 The housing 3 of the electric tool is provided with a first slot 31 for installing the third terminal seat 23 and a second slot 32 for installing the fourth terminal seat 24, and the third terminal seat 23 and the fourth terminal seat 24 are clamped on the housing 3. Specifically, the housing 3 is composed of a left housing and a right housing that are spliced ​​together facing each other, and the first slot 31 and the second slot 32 are jointly formed by corresponding slot parts on the left and right housings. During assembly, the third terminal seat 23 and the fourth terminal seat 24 are respectively positioned and inserted into the corresponding slots of the left housing or the right housing, and then fixedly connected to the right housing or the left housing, and at the same time, the left and right housings clamp the third terminal seat 23 and the fourth terminal seat 24 on the housing 3.

[0096] refer to Figure 24-Figure 29 In this embodiment, the battery pack 1 further includes a protective cover 15, which is slidably fixed to the upper shell 103 of the battery pack 1. The protective cover 15 can slide along the insertion direction of the battery pack 1, so that the protective cover 15 has a first state in which the first window 1032 is covered and a second state in which the first window 1032 is exposed. In the first state, since the protective cover 15 covers the first window 1032, short circuits and electric shocks caused by accidental touches can be avoided during use, thereby improving safety.

[0097] The electric tool is provided with a blocking member at a specific position. When the battery pack 1 is assembled into the cavity 30 of the electric tool in a straight direction, the blocking member acts on the protective cover 15, so that the protective cover 15 can be switched from a first state covering the first window 1032 to a second state exposing the first window 1032.

[0098] refer to Fig.14 and Fig. 27 The blocking member in this embodiment is a protrusion 2343 disposed on one side of the cover 234 of the third terminal seat 23. The protrusion 2343 may be provided in plurality, preferably disposed on one side of the two through holes 2341 close to the outside. Fig.30The height H1 of the protrusion 2343 is smaller than the height H2 of the third contact section 2311 of the third terminal 231 extending outside the through hole 2341, so as to avoid affecting the contact between the third terminal 231 and the second male terminal 221. In addition, when the battery pack is inserted into the power tool to achieve electrical connection, there is a gap between the protrusion 2343 and the surface of the upper shell 103 of the battery pack, and there is also a gap between the protective cover 15 and the third terminal seat 23 and the upper shell 103, so as to avoid friction caused by contact during sliding.

[0099] When the battery pack is inserted into the power tool to achieve electrical connection, the front end of the protective cover 15 close to the first terminal seat 21 first stops with the protrusion 2343. After the battery pack 1 is pushed in further, the protective cover 15 is blocked by the protrusion 2343 and cannot continue to move forward with the battery pack. The first window 1032 is exposed with the movement of the battery pack 1, and then the third terminal 231 of the third terminal seat 23 is in contact with the second contact segment 2211 of the second male terminal 221 to achieve electrical contact.

[0100] refer to Figure 27-Figure 29 The battery pack 1 also includes a second elastic member 16, which acts on the protective cover 15 to generate a force that allows the protective cover 15 to cover the first window 1032, so that when the battery pack 1 is not installed on the power tool, the protective cover 15 can maintain the first state of covering the first window 1032, allowing the protective cover 15 to automatically cover and perform a protective function.

[0101] Specifically, the middle part of the protective cover 15 has a limiter 151, and the two sides of the front end of the protective cover 15 close to the first terminal seat 21 are respectively provided with a sliding member 152. The outer shell 10 of the battery pack 1 has a limiter groove 17 and a slide groove 18 that match the limiter 151 and the slide groove 152 respectively, and the limiter groove 17 and the slide groove 18 extend along the insertion direction of the battery pack. The limiter 151 extends into the limiter groove 17, and the limiter 151 is slidably fixed in the limiter groove 17 by screws and washers. The limiter 151 is a column extending into the limiter groove 17, and the column is provided with an internal thread. The free end of the column passes through the first slide groove 161 and is connected to the screw 153. The screw 153 is threadedly fixed on the limiter 151 via a washer 154. The diameter of the washer 154 is larger than the width of the limiter groove 17 to prevent the limiter 151 from falling out of the limiter groove 17. Furthermore, the washer 154 slides in contact with the limiting groove 17, thereby reducing the friction between the head of the screw 153 and the limiting groove 17, making the sliding smoother. When the protective cover 15 is opened or closed, the limiting member 151 moves along the limiting groove 17, so that the protective cover 15 can maintain balance during the movement to prevent shaking and imbalance.

[0102] The two sliding members 152 extend into the corresponding slide grooves 18, and a second elastic member 16 is installed in each slide groove 18. The second elastic member 16 acts on the sliding member 152 extending into the slide groove 18, generating elastic force on the sliding member 152, thereby generating a force on the protective cover 15 to cover the first window 1032. The length of the limit groove 17 extending along the insertion direction is greater than the length of the first window 1032 extending along the insertion direction, so as to ensure that the first window 1032 can be fully exposed.

[0103] refer to Fig. 27 The slide groove 18 includes an upper slide groove 181 and a lower slide groove 182. The upper slide groove 181 is used to limit the sliding distance of the protective cover 15, and the lower slide groove 182 is used to accommodate the second elastic member 16. Fig. 27 and Fig.29 The side of the lower slide groove 182 is also fixedly connected with a mounting member 19. The mounting member 19 has a plate body 191 matching the lower slide groove 182, and the plate body 191 and the lower slide groove 182 form a limited space for accommodating the movement of the second elastic member 16 and the sliding member 152. A plurality of wing plates 192 extend from the edge of the plate body 191, and the wing plates 192 are fixed to the housing 10 by screws.

[0104] refer to Fig.29 The mounting member 19 is provided with a fixing portion 193 at one end away from the first terminal seat 21, one end of the second elastic member 16 is sleeved on the fixing portion 193, and the other end is in conflict with the sliding member 152 of the protective cover 15. The fixing portion 193 is a cross-column structure, so that the sleeve of the second elastic member 16 is more secure and not easy to fall off.

[0105] In this embodiment, the first terminal seat 21, the second terminal seat 22, the third terminal seat 23 and the fourth terminal seat 24 preferably do not include any movable parts. The movable parts mentioned here refer to that each component in each terminal seat is fixed to the corresponding object in a non-movable manner, and each component cannot move relative to the fixed object, such as translation, rotation and other movements.

[0106] For example, refer to Figure 6 , each first terminal 211 of the first terminal seat 21 is fixed to the first insulating seat 212 in a non-movable manner, such as fixing each first terminal 211 while the first insulating seat 212 is injection molded, or each first terminal 211 is fixed to the first insulating seat 212 by screws, and each first terminal 211 is then welded and fixed to the circuit board 13, so that the first terminal seat 21 is non-movably fixed to the battery pack.

[0107] refer to Fig.10 and Fig.19, each fourth terminal 241 of the fourth terminal seat 24 is also fixed to the fourth insulating seat 242 in a non-movable manner, such as fixing each fourth terminal 241 while the fourth insulating seat 242 is injection molded, or each fourth terminal 241 is fixed to the fourth insulating seat 242 by screws, and the fourth insulating seat 242 is then non-movably fixed to the housing 3 of the power tool, such as the above-mentioned slot fixation or screw fixation.

[0108] refer to Figure 6 and Fig.18 , each second female terminal 222 of the second terminal seat 22 is fixed to the second insulating seat 2221 in an immovable manner, such as fixing each second female terminal 222 while the second insulating seat 2221 is being injection molded, or each second female terminal 222 is fixed to the second insulating seat 2221 by screws, and each second female terminal 222 is then welded and fixed to the circuit board 13, so that the second female terminal 222 is immovably fixed to the battery pack. Each second male terminal 221 of each second terminal seat 22 can be immovably fixed to the upper shell 103 by the above-mentioned thermal riveting, or immovably fixed to the upper shell 103 by screws.

[0109] refer to Figure 19-Figure 23 The third terminal 231 of the third terminal seat 23 is fixedly connected to the connecting piece 232 in an immovable manner. To fix the third terminal 231 to the base 233 in an immovable manner, the third terminal 231 can be fixed by bolts or the like. When the third terminal 231 is fixed to the base 233 in an immovable manner, the first elastic member 2332 can be omitted. At this time, the third terminal 231 is preferably made of a reed with elasticity, and the third contact section 2311 of the third terminal 231 is better in contact with the second male terminal 221 by the elastic deformation of the reed itself.

[0110] Since the first terminal seat 21, the second terminal seat 22, the third terminal seat 23 and the fourth terminal seat 24 preferably do not include movable parts, when the battery pack or the power tool collides or falls, the components of the switching mechanism are not prone to loosening, and therefore the switching mechanism is not prone to failure to affect the normal use of the tool.

[0111] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A multi-voltage battery pack, characterized in that: include: A battery pack, the battery pack comprising a housing and a battery cell assembly, the housing having a space for accommodating the battery cell assembly, the battery cell assembly comprising at least two battery packs; A voltage switching mechanism, the voltage switching mechanism is electrically connected to the plurality of battery packs, the voltage switching mechanism comprises a first terminal seat and a second terminal seat fixed to the battery pack, and a third terminal seat and a fourth terminal seat fixed to the power tool; wherein the first terminal seat is coupled with the fourth terminal seat to obtain an output voltage, the second terminal seat is matched with the third terminal seat to achieve electrical connection, and the third terminal seat comprises a plurality of third terminals and at least one connecting piece; The multi-voltage battery pack is configured such that when the connecting piece is selectively connected to different third terminals, the battery pack has different output voltages.

2. The multi-voltage battery pack according to claim 1, characterized in that: The connecting piece is non-movably connected to the third terminal.

3. The multi-voltage battery pack according to claim 1, characterized in that: The second terminal seat includes a plurality of second terminals, each of which is immovably fixed inside the housing, and each of which is in contact with one of the third terminals.

4. The multi-voltage battery pack according to claim 3, characterized in that: The second terminal includes a second female terminal and a second male terminal, the second female terminal is immovably fixed to the battery cell assembly, the second male terminal is immovably fixed to the housing, and the second male terminal is electrically connected to the second female terminal.

5. The multi-voltage battery pack according to claim 4, characterized in that: The second male terminal includes a second contact segment and a second extension segment. The outer side of the second contact segment is used to contact with the third terminal to achieve electrical connection. The second extension segment extends on the inner side of the second contact segment in a direction toward the second female terminal. The second extension segment is inserted into the second female terminal.

6. The multi-voltage battery pack according to claim 5, characterized in that: The housing is provided with a first window in a region corresponding to the second contact section, and the second contact section contacts the third terminal through the first window.

7. The multi-voltage battery pack according to claim 6, characterized in that: The third terminal includes a third contact segment, and the third contact segment contacts the second contact segment.

8. The multi-voltage battery pack according to claim 1, characterized in that: The first terminal seat includes a plurality of first terminals, and the fourth terminal seat includes a plurality of fourth terminals. Each of the first terminals is immovably fixed to the battery pack, each of the fourth terminals is immovably fixed to the power tool, and each of the first terminals is in contact with one of the fourth terminals.

9. The multi-voltage battery pack according to claim 8, characterized in that: The first terminal and the fourth terminal are one of a male terminal and a female terminal that are matched with each other.

10. The multi-voltage battery pack according to claim 8, characterized in that: The housing is provided with a second window in a region corresponding to the first terminal, and the first terminal contacts the fourth terminal through the second window.

11. The multi-voltage battery pack according to claim 8, characterized in that: The first terminal includes a first terminal A, a first terminal B, a first terminal C and a first terminal C+, wherein the first terminal A and the first terminal B output a first voltage, the first terminal A and the first terminal C output a second voltage, and the first terminal B and the first terminal C+ are charging ports.

12. The multi-voltage battery pack according to claim 1, characterized in that: The first terminal seat, the second terminal seat, the third terminal seat and the fourth terminal seat do not include movable parts.

13. An electric tool, comprising an electric tool body and a power source, wherein the electric tool body comprises a housing, and the housing has a cavity for assembling the power source, wherein: The power source is a multi-voltage battery pack as described in any one of claims 1 to 12.

14. The electric tool according to claim 13, wherein: The third terminal seat and the fourth terminal seat are fixedly mounted on the inner wall of the cavity, and the first terminal seat and the second terminal seat are positioned on the battery pack to face the third terminal seat and the fourth terminal seat respectively.

15. The electric tool according to claim 14, characterized in that: The power supply is inserted into the cavity along a straight line, the first terminal seat is closer to the insertion end than the second terminal seat, the first terminal seat is plug-fitted with the fourth terminal seat, and the second terminal is in contact with the third terminal seat.

16. The electric tool according to claim 14, wherein: The housing is provided with a first slot and a second slot matched with the third terminal seat and the fourth terminal seat, and the third terminal seat and the fourth terminal seat are respectively fixed in the first slot and the second slot in an immovable manner.

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