CN220821774U - Battery pack and electric tool - Google Patents

Abstract

The utility model relates to a battery pack and an electric tool, wherein the battery pack comprises a shell and a battery cell assembly positioned in the shell, the shell is provided with a first window, and a protective cover which is slidably mounted on the shell, the protective cover can slide along the insertion direction of the battery pack assembled into the electric tool, and the sliding of the protective cover enables the protective cover to have a first state of covering the first window and a second state of exposing the first window; the protective cover is configured to: when the battery pack is assembled into the electric tool, the protective cover can be switched from the first state to the second state when the battery pack is assembled into the electric tool, and the battery pack has the advantages of convenience in use, high safety and the like.

Description

Battery pack and electric tool

Technical Field

The utility model relates to the technical field of electric bags, in particular to a battery pack and an electric tool.

Background

Currently, more and more electric tools use batteries as power sources to form battery-type electric tools without power lines. The electrical connection between the power tool and the power supply is typically achieved by using conductive terminals, i.e., conductive terminals are provided on the housing of the power tool and the battery pack, respectively, and when the battery pack is inserted into the power tool, the conductive terminals on the power tool and the battery pack are in conductive contact to achieve the electrical connection. In order to ensure the safety of the battery pack in the states of transportation, storage and the like, the situation that the terminal is touched by mistake is avoided, the protective cover is used for covering the conductive terminal on the battery pack in the prior art, the protective cover needs to be removed before the battery pack is inserted into the electric tool, the situation that the protective cover is forgotten to be removed when the battery pack is assembled, the situation that the conductive terminal is touched by mistake is also present, and potential safety hazards exist.

Disclosure of utility model

The utility model aims to provide a battery pack, and the protective cover of the battery pack can automatically expose the conductive terminal along with the movement of the battery pack when the battery pack is packaged, so that the battery pack is convenient to use and high in safety.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

A battery pack comprising a housing and a battery cell assembly located inside the housing, the housing being provided with a first window, and a protective cover slidably mounted on the housing, the protective cover being slidable in an insertion direction of the battery pack into a power tool, the sliding of the protective cover allowing the protective cover to have a first state covering the first window and a second state exposing the first window; the protective cover is configured to: the protective cover is switchable from the first state to the second state when the battery pack is assembled into the power tool.

In one embodiment, the battery pack further includes a second elastic member, and the second elastic member acts on the protective cover and generates a force for switching the protective cover from the second state to the first state.

In one embodiment, the protective cover is provided with a sliding member at a front end in an insertion direction, the housing has a sliding groove matched with the sliding member, the sliding groove extends along the insertion direction of the battery pack, the sliding member extends into the sliding groove, and the second elastic member is located in the sliding groove and acts on the sliding member.

In one embodiment, the sliding groove includes an upper sliding groove for defining a sliding distance of the protective cover, and a lower sliding groove for accommodating the second elastic member.

In one embodiment, the bottom of the lower chute is also fixedly connected with a mounting member, the mounting member has a plate body matched with the lower chute, and the plate body and the lower chute form a limited space for accommodating the movement of the second elastic member and the sliding member.

In one embodiment, the mounting member is provided with a fixing portion at one end far away from the sliding member, one end of the second elastic member is fixed to the fixing portion, and the other end of the second elastic member is abutted against the sliding member.

In one embodiment, the middle part of the protective cover is provided with a limiting piece, the shell is provided with a limiting groove matched with the limiting piece, the limiting piece stretches into the limiting groove, the free end of the limiting piece is fixedly provided with a fixing piece, and the fixing piece enables the limiting piece to be slidably fixed in the limiting groove.

In one embodiment, the fixing member includes a screw fixed to the stopper via a washer, and the washer has a diameter larger than a width of the stopper groove.

In one embodiment, the length of the limiting groove extending along the insertion direction is greater than the length of the first window extending along the insertion direction.

The utility model also provides an electric tool, which comprises an electric tool body and a power supply, wherein the electric tool body comprises a shell, the shell is provided with a containing cavity for assembling the power supply, the power supply is any one of the battery packs, a blocking piece which is arranged corresponding to a protective cover of the battery pack is arranged in the containing cavity, and when the battery pack is assembled into the electric tool, the blocking piece is contacted with the protective cover to enable the protective cover to be switched from the first state to the second state.

In one embodiment, the battery cell assembly includes a second terminal block, the second terminal block includes a second terminal corresponding to the first window, the casing is provided with a third terminal block, the third terminal block includes a third terminal opposite to the second terminal, and the protective cover is located between the second terminal and the third terminal.

In one embodiment, the blocking member is a bump disposed on the third terminal seat, and a top surface of the bump is lower than a top surface of the third terminal.

By adopting the technical scheme, the protective cover of the battery pack has the beneficial effects that the protective cover is kept in the first state of covering the first window when the battery pack is not assembled to the electric tool, so that the protective cover can automatically cover the first window to play a protective function, and when the battery pack is assembled to the electric tool, the protective cover can automatically expose the first window to realize the electric connection between the battery pack and the electric tool, so that the electric tool has the advantages of convenience in use and high safety.

Drawings

Fig. 1 is a schematic view of a multi-cell battery pack assembled to a housing of a power tool.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a schematic view of the multi-voltage battery pack with the upper case removed.

Fig. 4 is a top view of fig. 3.

Fig. 5 is a schematic view of the front side of the upper case of the multi-voltage battery pack.

Fig. 6 is a schematic diagram of a cell assembly.

Fig. 7 is a schematic view of the left housing of the multi-voltage battery pack.

Fig. 8 is a schematic view of the right housing of the multi-voltage battery pack.

Fig. 9 is a schematic view of a first terminal.

Fig. 10 is a schematic view of a fourth terminal block.

Fig. 11 is a schematic view of the second terminal.

Fig. 12 is a schematic view of a second male terminal.

Fig. 13 is a schematic view of the third terminal block with the base removed.

Fig. 14 is a schematic view of the third terminal block from another view after the base is removed.

Fig. 15 is a schematic view of the third terminal block in a parallel state.

Fig. 16 is a schematic diagram of the third terminal in a serial state.

Fig. 17a is a circuit diagram of the battery pack in an idle state.

Fig. 17b is a circuit diagram of the battery pack in a 40V discharge state.

Fig. 17c is a circuit diagram of the battery pack in an 80V discharge state.

Fig. 17d is a circuit diagram of the battery pack in a 40V charged state.

Fig. 18 is a schematic view of the back side of the upper case of the multi-voltage battery pack.

Fig. 19 is a schematic view of a housing of the power tool.

Fig. 20 is a schematic view of a third terminal.

Fig. 21 is a schematic view of a base of the third terminal block.

Fig. 22 is a schematic view of a cover of the third terminal block.

Fig. 23 is a schematic view of the right half of the housing of the power tool.

Fig. 24 is a schematic view of a multi-voltage battery pack.

Fig. 25 is a schematic view of the protective cover on the multi-cell pack exposing the first window.

Fig. 26 is a schematic view of a protective cover over a multi-cell pack covering a first window.

Fig. 27 is a schematic partial cross-sectional view of the second terminal block and the third terminal block in contact.

Fig. 28 is a schematic view of a protective cover.

Fig. 29 is a schematic view of the mount.

Fig. 30 is a side view of a third terminal block.

Detailed Description

The preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the objects, features and advantages of the present utility model will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the utility model, but rather are merely illustrative of the true spirit of the utility model.

In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, 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.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and variations such as "comprises" and "comprising" will be understood to be open-ended, meaning of inclusion, i.e. to be interpreted to mean "including, but not limited to.

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

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.

In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present utility model, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

The utility model provides a multi-voltage battery pack, which is characterized in that a voltage switching mechanism is immovably arranged on the battery pack and an electric tool, on one hand, the arrangement of parts in the battery pack is reduced, the parts in the battery pack are fixedly connected, and when accidents occur, the parts are not easy to damage, so that the safety and stability of the battery pack are improved, and the service life of the battery pack is prolonged; on the other hand, the switching part of the voltage switching mechanism is directly and independently arranged on the electric tool, so that the electric tool is simple in structure, convenient to assemble, disassemble and replace and high in convenience.

Referring to fig. 1-30, the multi-voltage battery pack includes a battery pack having at least two relatively independent battery packs and a voltage switching mechanism that realizes output of various voltages by switching the series and parallel connection of the individual battery packs.

The battery pack 1 includes a housing and a cell assembly fixedly mounted inside the housing. Specifically, referring to fig. 1 to 6, the casing 10 of the battery pack 1 is constituted by a left casing 101, a right casing 102, and an upper casing 103. The left and right cases 101 and 102 are fixed by bolts, and form a cell chamber for housing the cell assembly.

The battery cell assembly comprises a plurality of battery cells 110 and a circuit board 13, wherein the battery cells 110 are fixedly arranged on a battery cell bracket 12, and are divided into two groups of battery packs, namely a first battery pack 11a and a second battery pack 11b, and each battery pack is electrically connected with corresponding positive and negative electrodes 14 on the circuit board 13 through conductive objects such as wires. The first battery pack 11a and the second battery pack 11b generally have the same voltage and current output capability, but each battery pack within the battery pack 1 may also have different voltage and current output capability for some different requirements.

Referring to fig. 5 and 7-8, the left and right housings 101 and 102 form a clamping groove 104 around the opening of the cell cavity, the clamping groove 104 and the edge of the upper housing 103 are matched with the clamping groove 104, and the edge of the upper housing 103 can be inserted into the clamping groove 104, so that the upper housing 103 can be fixed at the opening of the cell cavity by the left and right housings 101 and 102. The left shell 101 and the right shell 102 are respectively provided with a positioning column 105 which is mutually matched and clamped, the right shell 102 can be positioned and installed on the left shell 101 through the positioning columns 105, and then the right shell 102 is fixedly connected to the left shell 101 through screws in the positioning columns of the left shell 101. Preferably, the upper housing 103 has a fixing through hole 1031 penetrating the upper housing 103 in 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 housing 101 and the right housing 102 are fixed in a matching manner, the positioning column 105 penetrates the fixing through hole 1031 to further fix the upper housing 103.

Referring to fig. 2, 7 and 8, the inner side walls of the left housing 101 and the right housing 102 are respectively provided with a limiting rib 106 matched with the battery cell support 12, and the battery cell support 12 is limited in the battery cell cavity by the limiting ribs.

The voltage switching mechanism includes a first terminal block 21 and a second terminal block 22 fixed to the battery pack 1, and a third terminal block 23 and a fourth terminal block 24 fixed to the casing 3 of the electric power tool.

Specifically, referring to fig. 2-4, the first terminal seat 21 includes a plurality of first terminals 211 fixed on the circuit board 13 of the battery pack 1, and the first terminals in this embodiment include five ports, i.e. a first terminal A, B, C, C + and a signal port, wherein the first terminal A, B, C, C + is responsible for charging and discharging of the battery pack, and the signal port is responsible for signal communication.

Referring to fig. 9, the plurality of first terminals 211 on the first terminal base 21 are all first female terminals having insertable portions, the first terminals 211 are made of metal spring materials, and the metal spring is bent to form a substantially Y-shaped insertable portion, so that the inserted male terminal portion is in stable contact with the first terminals 211.

Referring to fig. 10, the fourth terminal block 24 includes a plurality of fourth terminals 241 corresponding to the first terminals A, B, C, C + and signal ports of the first terminal block 21, each of the fourth terminals is in contact with a corresponding one of the first terminals, so as to make electrical contact between the first terminals and the fourth terminals, and finally, the voltage is output through the electrical connection between the first terminal block 21 on the battery pack 1 and the fourth terminal block 24 on the electric tool. The fourth terminal 241 of the fourth terminal holder 24 is a fourth male terminal that matches the first female terminal, the fourth male terminal has a linear insertion portion that matches the insertable portion of the first terminal 211, and 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 by elastic deformation of the metal reed itself, so that the fourth terminal 241 and the first terminal 211 form stable electrical contact.

Referring to fig. 4-6 and 11-12, the second terminal block 22 includes a plurality of second terminals 220. Wherein 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 case 103. Specifically, the second male terminal 221 includes a second contact section 2211, a second curved section 2212, a second fixed section 2213, and a second extending section 2214, the second curved section 2212 is used for connecting the second contact section 2211 with the second fixed section 2213, the outer side of the second contact section 2211 is used for making contact with the third terminal to achieve electrical connection, the second extending section 2214 longitudinally extends along the direction of the second female terminal 222 inside the second contact section 2211, and the second extending section 2214 is inserted into the second female terminal 222 to achieve electrical connection.

Referring to fig. 5, 12 and 18, the upper housing 103 is provided with a first window 1032 in a region corresponding to the second contact section 2211 of each second male terminal 221, and each first window 1032 is configured to expose the second contact section 2211 of the corresponding second male terminal 221, so that the third terminal 231 can be in contact with the second contact section 2211 to achieve electrical connection. The outer side of the second contact segment 2211 is located substantially in the same plane as the outer side of the upper housing 103 or slightly below the upper housing plane, preferably slightly below the upper housing plane, i.e. the outer side of the second contact segment 2211 is located in the first window 1032 and does not exceed the first window 1032, so that a certain positioning effect can be achieved on the position of the third terminal 231 when the battery pack 1 is inserted into the electric tool.

The inner wall of the upper housing 103 is provided with a connection portion 1033 extending longitudinally along the direction of the battery cell at a position corresponding to the second fixing section 2213 of each second male terminal 221, the second fixing section 2213 is provided with a connection hole 2215 matched with the connection portion 1033, and the second male terminal 221 is fixed to the upper housing 103 through a fixed connection between the connection portion 1033 and the connection hole 2215. The connection portion 1033 in the present embodiment is a plastic column, and the connection portion 1033 passes through the corresponding connection hole 2215 and then fixedly installs the second male terminal 221 on the upper housing 103 by a heat riveting process. In order to secure 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.

Referring again to fig. 5-6 and 18-19, the upper housing 103 is provided with a second window 1034 at a location corresponding to each first terminal 211, and the fourth terminal 241 of the fourth terminal holder 24 can extend into contact with the corresponding first terminal 211 within the corresponding second window 1034 to make electrical contact, or the first terminal 211 can extend from the corresponding second window 1034 to outside the upper housing 103 to make electrical contact with the corresponding fourth terminal 241. Preferably, the first terminal 211 is located in the upper housing 103, and the fourth terminal 241 extends into the upper housing 103 from the second window 1034 to contact with the corresponding first terminal 211, so that the first terminal 211 is located inside the housing, avoiding the first terminal 211 from being touched by mistake during use, and improving safety.

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

1) The plurality of battery cells 110 are fixedly arranged on the battery cell bracket 12 and are connected with the circuit board 13 to form a battery cell assembly in a matching way. The plurality of first terminals 211 of the first terminal block 21 and the plurality of second female terminals 222 of the second terminal block 22 may be fixed on the circuit board 13 in advance, and the second male terminals 221 of the second terminal block 22 may be fixed on the upper case 103 in advance.

2) The second extension 2214 of the second male terminal 221 is inserted into the second female terminal 222 on the cell assembly such that the upper housing is positioned and mounted on the cell assembly.

3) The cell assembly and the upper housing 103 are mounted in the right housing 102 by the limit ribs 106 and the clamping grooves 104.

4) The right shell 102 is positioned and installed on the left shell 101 through the positioning column 105, and finally is fixedly connected to the right shell through screws in the positioning column of the left shell 101, so that the assembly of the battery pack is completed.

Referring to fig. 13 to 16, the third terminal holder 23 includes a third terminal 231 and a connection piece 232. The number of third terminals 231 corresponds to the number of second male terminals 221 on the second terminal block 22. The second male terminal 221 in the present embodiment includes a second male terminal a, b, c, d, and correspondingly, the third terminal 231 includes third terminals a, b, c, d, each of which contacts the outer side of the second contact section 2211 of a corresponding one of the second male terminals, so as to implement electrical contact between the third terminal and the second male terminal. The connecting piece 232 is connected to a different third terminal to switch the voltage of the battery pack 1.

In the present embodiment, when the third terminals a and B, and c and d on the third terminal base 23 are connected by the connecting pieces in pairs, the first battery 11a and the second battery 11B are in parallel, the first terminals a and B of the first terminal base 21 output the first voltage, and the output voltage is 40V. When the third terminals a and d on the third terminal base are connected through the connecting sheet, the connection sheets b and C are empty, the first battery pack 11a and the second battery pack 1 are in a series connection state, the first terminals A and C of the first terminal base 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 shown in fig. 17a, 17b and 17c, respectively. Therefore, when the multi-battery pack switching system is applied, the first terminal seat 21 and the second terminal seat 22 are immovably fixed on the circuit board 13 of the battery pack 1, the third terminal seat 23 and the fourth terminal seat 24 are immovably fixed on the electric tool, and meanwhile, corresponding connecting pieces are selected according to the voltage requirement of the electric tool to be connected with corresponding third terminals so as to realize corresponding voltage output, wherein the third terminal seat 23 and the fourth terminal seat 24 serving as the voltage switching mechanism are directly and independently arranged on the electric tool, the multi-battery pack switching system is simple in structure, convenient to assemble, disassemble and replace and high in convenience, parts inside the battery pack are reduced to be fixedly connected, and when accidents occur, the parts are not easy to damage, the safety stability of the battery pack is improved, and the service life is prolonged.

In this embodiment, the first terminal seat 21 further has a charging port c+, and when the battery pack is charged, the battery pack is charged with 40V, and the first terminals B and c+ of the first terminal seat of the battery pack are the charging ports. Referring to fig. 17d, since the port a is a discharge output port, the output current is larger, and the current is smaller when the port c+ is charged, and circuit protection components such as MOS are provided on the charging circuit, the port a and the port c+ need to be separately provided because the port a is easy to burn out when the current is too large.

Referring to fig. 1-2 and 19, the power tool has a cavity 30 therein, the complete configuration of the power tool is not shown, and only the configuration of the power tool for assembling the battery pack portion is shown. The cavity 30 is matched with the external structure of the battery pack 1, at least a part of the battery pack 1 can extend 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, and 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, so that the electric tool can acquire the working voltage through being electrically connected with the fourth terminal seat 24. In the present embodiment, the battery pack 1 is assembled into the housing 30 of the power tool while moving in the front-rear direction.

Referring to fig. 20-22, third terminal 231 includes a third contact segment 2311, a third curved segment 2312, and a third fixed segment 2313. Wherein third securing section 2313 is positioned at both ends of third contact section 2311, third curved section 2312 is used to connect third contact section 2311 contact section with third securing section 2313.

The third terminal holder 23 further includes a base 233 and a cover 234, and the base 233 and the cover 234 cooperate to form a cavity for securing 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 terminals 231, the third fixing sections 2313 of the third terminals 231 are provided with third positioning posts 2314 matched with the first mounting grooves 2331, the third positioning posts 2314 position and mount the third terminals 231 in the first mounting grooves 2331, and the plurality of third terminals 231 of the third terminal holders 23 are sequentially and transversely arranged in the cavity.

Specifically, the first mounting groove 2331 is further provided with a first elastic member 2332, the first elastic member 2332 is not compressed by an external force, and the height of the first elastic member 2332 in a natural state is greater than the depth of the first mounting groove 2331 (the compressed spring is illustrated), the first elastic member 2332 in this embodiment is a spring member, and the third positioning post 2314 is sleeved in the spring member, so that the spring member generates an elastic force to the third terminal 231, and the elastic force makes the third terminal 231 and the second male terminal 221 more tightly contact. In one embodiment, the plurality of first elastic members 2332 provided in each of the first mounting grooves 2331 are uniform in height. In another embodiment, the height of the first elastic piece on the same side in the third terminal seat is inconsistent with the height of the first elastic piece on the other side, so that the third terminal is in an inclined state when contacting with the second male terminal, and the contact is tighter when contacting with the side with larger elasticity.

In order to increase the tightness of the contact between the third terminal and the second male terminal, a plurality of bumps may be further provided on the third contact section 2311. In addition, the third contact segment 2311 of the third terminal and the second contact segment 2211 of the second male terminal can also be plated with chromium on the surface of the contact segment by using a chromium plating process, so that the hardness of the contact surface is increased, and the abrasion degree of the contact surface is reduced.

Referring to fig. 13 and 20, a connection post 2315 is further provided on the inner side of the third contact section 2311, a screw hole is provided on the connection post 2315, a fixing hole matched with the connection post 2315 is provided on the connection piece 232, and the connection piece 232 is fixedly connected with the third terminal 231 by a screw passing through the fixing hole and being screwed on the connection post 2315.

Referring to fig. 22, the cover 234 is provided with a plurality of through holes 2341 for exposing the third contact section 2311 at positions corresponding to the third contact section 2311 of the third terminal 231. The outer side of the third contact section 2311 serves to expose the through hole 2341 to be in contact with the second male terminal 221 for electrical connection. The inner side of the cover 234 is further provided with a plurality of limiting cavities 2342, and the limiting cavities 2342 are matched with the third fixing sections 2313 of the third terminals and are used for limiting and fixing the third terminals 231.

Referring to fig. 23, a first slot 31 for installing a third terminal block 23 and a second slot 32 for installing a fourth terminal block 24 are formed in a housing 3 of the electric tool, and the third terminal block 23 and the fourth terminal block 24 are clamped on the housing 3. Specifically, the housing 3 is composed of two left and right housings spliced in opposite directions, and the first slot 31 and the second slot 32 are formed together via corresponding slot portions 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 corresponding slots of the left casing or the right casing, and then are fixedly connected with the right casing or the left casing, and meanwhile, the left casing and the right casing clamp the third terminal seat 23 and the fourth terminal seat 24 on the casing 3.

Referring to fig. 24-29, in the present embodiment, the battery pack 1 further includes a protection cover 15, and the protection cover 15 is slidably fixed to the upper case 103 of the battery pack 1. The protection cover 15 is slidable in the insertion direction of the battery pack 1, and the protection 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, the protection cover 15 covers the first window 1032, so that the problems of short circuit prevention and personnel false triggering caused by electric shock can be avoided, and the safety is improved.

The power tool is provided with a stopper at a specific position, and when the battery pack 1 is fitted into the housing 30 of the power tool in a straight direction, the stopper acts on the protection cover 15, so that the protection cover 15 can be switched from a first state in which the first window 1032 is covered to a second state in which the first window 1032 is exposed.

Referring to fig. 14 and 27, the stopper in the present embodiment is a protrusion 2343 provided on the cover 234 side of the third terminal block 23, and the protrusion 2343 may be provided in plurality, preferably, on the side of two through holes 2341 near the outside. Referring to fig. 30, the height H1 of the bump 2343 is smaller than the height H2 of the third contact section 2311 of the third terminal 231 extending out of the through hole 2341, avoiding affecting the contact between the third terminal 231 and the second male terminal 221. And in the process of inserting the battery pack into the electric tool to realize electric connection, a gap exists between the convex block 2343 and the surface of the upper shell 103 of the battery pack, and a gap also exists between the protective cover 15 and the third terminal seat 23 and the upper shell 103, so that friction caused by contact during sliding is avoided.

In the process of inserting the battery pack into the electric tool to realize electrical connection, the front end of the side, close to the first terminal seat 21, of the protective cover 15 is firstly abutted against the protruding block 2343, after the battery pack 1 is pushed in continuously, the protective cover 15 is blocked by the protruding block 2343 and cannot move forward along with the battery pack continuously, the first window 1032 is exposed along with the movement of the battery pack 1, and then the third terminal 231 of the third terminal seat 23 is contacted with the second contact section 2211 of the second male terminal 221 to realize electrical contact.

Referring to fig. 27-29, the battery pack 1 further includes a second elastic member 16, where the second elastic member 16 acts on the protection cover 15 to generate a force for covering the first window 1032 by the protection cover 15, so that the protection cover 15 can maintain the first state of covering the first window 1032 when the battery pack 1 is not mounted on the electric tool, and the protection cover 15 automatically covers the electric tool to perform a protection function.

Specifically, the middle part of the protection cover 15 has a limiting member 151, and two sides of the front end of the protection cover 15, which is close to the first terminal seat 21, have a sliding member 152 respectively. The casing 10 of the battery pack 1 is provided with a limit groove 17 and a slide groove 18 which are respectively matched with the limit piece 151 and the slide piece 152, and the limit groove 17 and the slide groove 18 extend along the insertion direction of the battery pack. The limiting piece 151 stretches into the limiting groove 17, and the limiting piece 151 is slidably fixed in the limiting groove 17 through the screw and the gasket. The limiting piece 151 is a cylinder extending into the limiting groove 17, the cylinder is provided with internal threads, the free end of the cylinder penetrates through the first sliding groove 161 to be connected with the screw 153, the screw 153 is fixed on the limiting piece 151 through the gasket 154 in a threaded mode, and the diameter of the gasket 154 is larger than the width of the limiting groove 17 so as to prevent the limiting piece 151 from falling out of the limiting groove 17. And, the washer 154 slides in contact with the limit groove 17, thereby reducing friction between the head of the screw 153 and the limit groove 17, and enabling the sliding to be smoother. When the protection cover 15 is opened or closed, the limiting piece 151 moves along the limiting groove 17, so that the protection cover 15 can maintain balance in the moving process, and shaking unbalance is prevented.

The two sliding members 152 extend into the corresponding sliding grooves 18, and a second elastic member 16 is installed in each sliding groove 18, and the second elastic member 16 acts on the sliding member 152 extending into the sliding groove 18 to generate elastic force on the sliding member 152, and further generates acting force on the protection cover 15 to cover the first window 1032. Wherein, the length of the limiting groove 17 extending along the inserting direction is longer than the length of the first window 1032 extending along the inserting direction, so as to ensure that the first window 1032 can be completely exposed.

Referring to fig. 27, the chute 18 includes an upper chute 181 and a lower chute 182, the upper chute 181 is used to define a sliding distance of the protection cover 15, and the lower chute 182 is used to accommodate the second elastic member 16. Referring to fig. 27 and 29, the side of the lower chute 182 is also fixedly connected with the mounting member 19. The mounting member 19 has a plate body 191 mated with the lower chute 182, the plate body 191 and the lower chute 182 forming a defined space for accommodating movement of the second elastic member 16 and the slider 152. The edge of the plate body 191 extends a plurality of wings 192, and the wings 192 are fixed to the housing 10 by screws.

Referring to fig. 29, the mounting member 19 has a fixing portion 193 at an end far from the first terminal seat 21, and one end of the second elastic member 16 is sleeved on the fixing portion 193, and the other end abuts against the slider 152 of the protection cover 15. The fixing portion 193 has a cross-shaped columnar structure, so that the second elastic member 16 is sleeved more firmly and is not easy to fall off.

In this embodiment, the first terminal block 21, the second terminal block 22, the third terminal block 23 and the fourth terminal block 24 preferably do not include movable members, where the movable members refer to the respective components in the respective terminal blocks being immovably fixed to the corresponding objects, and the respective components being immovable after being fixed, such as translational, rotational, etc., relative to the fixed objects.

For example, referring to fig. 6, each first terminal 211 of the first terminal holder 21 is immovably fixed to the first insulating holder 212, such as fixing each first terminal 211 while the first insulating holder 212 is injection-molded, or each first terminal 211 is fixed to the first insulating holder 212 by a screw, each first terminal 211 is then welded and fixed to the circuit board 13, thereby achieving the immovably fixing of the first terminal holder 21 to the battery pack.

Referring to fig. 10 and 19, each fourth terminal 241 of the fourth terminal holder 24 is also immovably fixed to the fourth insulating holder 242, such as by fixing each fourth terminal 241 while the fourth insulating holder 242 is injection-molded, or each fourth terminal 241 is fixed to the fourth insulating holder 242 by a screw, and the fourth insulating holder 242 is immovably fixed to the housing 3 of the electric tool, such as the above-described clamping groove or by a screw.

Referring to fig. 6 and 18, each of the second female terminals 222 of the second terminal block 22 is immovably fixed to the second insulating block 2221, such as fixing each of the second female terminals 222 while the second insulating block 2221 is injection-molded, or each of the second female terminals 222 is fixed to the second insulating block 2221 by screws, and each of the second female terminals 222 is welded to the circuit board 13, thereby achieving the immovable fixation of the second female terminals 222 to the battery pack. And each of the second male terminals 221 of each of the second terminal holders 22 may be immovably fixed to the upper case 103 by the above-mentioned heat staking, or immovably fixed to the upper case 103 by screw fixation.

Referring to fig. 19-23, the third terminal 231 of the third terminal holder 23 is fixedly connected with the connecting piece 232 in an immovable manner, so that the third terminal 231 is fixed with the base 233 in an immovable manner, and the third terminal 231 can be implemented by bolting or the like. When the third terminal 231 is immovably fixed with the base 233, the first elastic member 2332 may be omitted, and at this time, the third terminal 231 is preferably made of a spring plate having elasticity, so that the third contact section 2311 of the third terminal 231 is better contacted with the second male terminal 221 by the elastic deformation of the spring plate itself.

Since the first terminal block 21, the second terminal block 22, the third terminal block 23 and the fourth terminal block 24 preferably do not include movable members, the respective components of the switching mechanism are not easily released when the battery pack or the electric tool collides or falls, and thus the normal use of the tool is not easily affected by the failure of the switching mechanism.

While the preferred embodiments of the present utility model have been described in detail, it will be appreciated that those skilled in the art, upon reading the above teachings, may make various changes and modifications to the utility model. Such equivalents are also intended to fall within the scope of the utility model as defined by the following claims.

Claims (12)

1. A battery pack comprising a housing and a battery cell assembly located inside the housing, wherein the housing is provided with a first window, and a protective cover slidably mounted on the housing, the protective cover being capable of sliding in an insertion direction in which the battery pack is assembled into a power tool, the sliding of the protective cover allowing the protective cover to have a first state covering the first window and a second state exposing the first window; the protective cover is configured to: the protective cover is switchable from the first state to the second state when the battery pack is assembled into the power tool.

2. The battery pack of claim 1, further comprising a second resilient member that acts on the protective cover and exerts a force on the protective cover that switches from the second state to the first state.

3. The battery pack according to claim 2, wherein the protective cover is provided with a slider at a front end in an insertion direction, the housing has a slide groove that mates with the slider, the slide groove extends in the insertion direction of the battery pack, the slider extends into the slide groove, and the second elastic member is located in the slide groove and acts on the slider.

4. A battery pack as claimed in claim 3, wherein the slide groove includes an upper slide groove for defining a sliding distance of the protective cover and a lower slide groove for accommodating the second elastic member.

5. The battery pack of claim 4, wherein a mounting member is fixedly connected to the bottom of the lower chute, the mounting member having a plate body matched with the lower chute, the plate body and the lower chute forming a defined space for accommodating movement of the second elastic member and the sliding member.

6. The battery pack as claimed in claim 5, wherein the mounting member is provided at one end remote from the sliding member with a fixing portion, one end of the second elastic member is fixed to the fixing portion, and the other end thereof abuts against the sliding member.

7. The battery pack according to claim 1, wherein the middle part of the protective cover is provided with a limiting piece, the shell is provided with a limiting groove matched with the limiting piece, the limiting piece stretches into the limiting groove, the free end of the limiting piece is fixedly provided with a fixing piece, and the limiting piece is slidably fixed in the limiting groove.

8. The battery pack of claim 7, wherein the fixing member includes a screw and a washer, the screw is fixed to the limiting member via the washer, and a diameter of the washer is greater than a width of the limiting groove.

9. The battery pack of claim 7, wherein the limit slot extends in the insertion direction for a length greater than a length of the first window extending in the insertion direction.

10. An electric tool comprising an electric tool body and a power source, the electric tool body comprising a housing having a cavity for mounting the power source, wherein the power source is a battery pack according to any one of claims 1 to 9, a blocking member is provided in the cavity corresponding to a protective cover of the battery pack, and when the battery pack is mounted in the electric tool, the blocking member contacts with the protective cover to switch the protective cover from the first state to the second state.

11. The power tool of claim 10, wherein the battery cell assembly includes a second terminal block including a second terminal disposed corresponding to the first window, the housing is provided with a third terminal block including a third terminal disposed opposite to the second terminal, and the protective cover is disposed between the second terminal and the third terminal.

12. The power tool of claim 11, wherein the stopper is a bump provided on the third terminal seat, and a top surface of the bump is lower than a top surface of the third terminal.