Battery pack and assembly of battery pack and electric tool

Abstract

The utility model relates to the technical field of battery packs, and particularly discloses a battery pack and an assembly of the battery pack and an electric tool, the battery pack comprises a base part and a rod part connected with the base part, the rod part is internally provided with an accommodating cavity, the accommodating cavity is internally provided with a battery cell, a circuit board and a discharge terminal installed on the circuit board, the discharge terminal is electrically connected with the battery cell, and the battery cell is electrically connected with the circuit board. The rod part is provided with an opening corresponding to the discharge terminal; a lock catch is arranged on the base part, the base part is rotationally matched with the rod part, and the base part can rotate around the central axis of the rod part relative to the rod part. After the battery pack is inserted into the main body of the electric tool, only the base part of the battery pack needs to be rotated when the battery pack is locked and fixed, and the rod part of the battery pack inserted into the main body of the electric tool does not need to be rotated, so that the design is particularly suitable for the battery pack in which the discharge terminal and the power connection terminal are matched in a plug-in manner; and meanwhile, the device is also suitable for a battery pack in which a discharge terminal and a power connection terminal are matched in a surface-surface contact manner, and the popularization and application range is relatively wide.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack and its assembly with an electric tool. Background Art

[0002] The battery pack is the power source of the power tool. Common battery packs are installed on the main body of the power tool by insertion. A discharge terminal is provided at one end of the battery pack, and a power terminal corresponding to the discharge terminal is provided on the mounting portion of the power tool main body. In order to ensure the stability and firmness of the battery pack installation, a buckle structure is generally provided at the tail of the battery pack. The common battery pack installation method is: insert the battery pack into the mounting portion of the power tool, and then rotate the battery pack. The buckle structure at the tail of the battery pack engages with the card slot on the power tool, thereby achieving the purpose of locking and installing the battery pack. At this time, the discharge terminal on the battery pack is aligned with the main body of the power tool. The power terminals are used to complete the matching. The structure of this battery pack and its installation method are only suitable for discharge terminals and power terminals with surface-to-surface contact. If the discharge terminals and power terminals are matched in a plug-in manner, the installation method of rotating and locking the battery pack as a whole will show a major disadvantage. Because when the discharge terminals and power terminals are matched in a plug-in manner, during the installation of the battery pack, the battery pack is first inserted into the mounting part of the power tool body and inserted to the bottom. At this time, the discharge terminals and power terminals are in a plug-in state, and the battery pack as a whole cannot be rotated. At this time, the battery pack cannot be locked and fixed by rotation. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a battery pack and an assembly thereof with an electric tool.

[0004] The technical solution adopted by the utility model to solve the technical problem is to provide a battery pack, including:

[0005] base;

[0006] A rod portion connected to the base portion;

[0007] The rod portion is provided with a receiving cavity, in which a battery cell, a circuit board and a discharge terminal mounted on the circuit board are provided, the discharge terminal is electrically connected to the battery cell, and an opening corresponding to the discharge terminal is provided on the rod portion;

[0008] A lock is provided on the base;

[0009] The base is rotatably matched with the rod, and the base can rotate relative to the rod around the central axis of the rod, so that the lock buckle on the base is locked with the lock key on the power tool body where the battery pack is installed;

[0010] Through the above technical solution, the base of the present application is rotatably matched with the rod, the battery cell, the circuit board and the discharge terminal are integrated in the rod, and when the battery pack is installed on the power tool body, the rod of the battery pack is inserted into the mounting portion of the power tool body. At this time, the discharge terminal on the battery pack directly matches with the power terminal on the power tool body. When the base is rotated, the rod inserted into the mounting portion of the power tool body remains stationary. After the base is rotated to a certain installation position relative to the rod, the lock buckle on the base is locked and matched with the lock key on the power tool body. In the locked state, the entire battery pack cannot be pulled out from the power tool body.

[0011] The advantage of this design is that after the battery pack is inserted into the power tool body, when locking and fixing the battery pack, you only need to rotate the base of the battery pack, and the rod of the battery pack inserted into the power tool body does not need to be rotated. This design is particularly suitable for battery packs whose discharge terminals and power terminals are matched in a plug-in manner. It is also suitable for battery packs whose discharge terminals and power terminals are matched in a surface-to-surface contact manner, and has a wide range of promotion and use.

[0012] Further, the base and the rod are connected to each other through a buckle, and after the base and the rod are connected to each other through the buckle, the base and the rod are limited to each other in the direction of the central axis of the rod.

[0013] Furthermore, the buckle comprises a buckle arranged on the rod, and a slot corresponding to the buckle is arranged on the inner wall of the base. When the rod is inserted into the base, the buckle is engaged with the slot.

[0014] Furthermore, the circumferential extension length of the slot on the base is greater than the circumferential extension length of the buckle on the rod. After the buckle is engaged with the slot, the buckle and the slot are mutually limited in the direction of the central axis of the rod, and the buckle can rotate circumferentially in the slot.

[0015] Through the above technical solution, the purpose of the rod and the base being mutually matched through the buckle and the slot is to facilitate the assembly of two independent rods and the base. The base and the rod assembled by the buckle are mutually limited in the direction of the central axis of the rod. In this way, when a person holds the base, the rod of the battery pack can be pushed into the mounting part of the power tool body, or the rod can be pulled out from the mounting part of the power tool body. When the battery pack is pushed in or pulled out, the base and the rod are firmly connected and will not separate.

[0016] In addition, the circumferential extension length of the slot on the base is greater than the circumferential extension length of the buckle on the rod. The purpose of this design is that after the buckle is engaged with the slot, the rod and base that are axially limited to each other can rotate together, and when the base rotates relative to the rod, the buckle can rotate circumferentially in the slot. This can ensure that the rod and base that cooperate with each other cannot be separated, and the base can rotate within the circumferential range allowed by the slot. After the rod is inserted into the power tool body, the rod does not move, and the battery pack can be locked and fixed to the power tool body by rotating the base.

[0017] Furthermore, the slot provides a rotation space for the buckle, and when the base rotates relative to the rod, the buckle can rotate circumferentially in the slot. When the end of the buckle contacts the wall of the rotation space, the lock buckle on the base locks with the lock key on the power tool body.

[0018] Through the above technical solution, after the buckle is engaged with the slot, when the base is rotated, the slot on the inner wall of the base rotates circumferentially relative to the buckle. When the end of the buckle contacts the end wall of the slot, the lock buckle connected to the outside of the base just locks with the lock key on the power tool body. That is to say, after the base is rotated into place, the lock buckle and the lock key are just locked into place, ensuring the accuracy of locking the battery pack and the power tool body.

[0019] Furthermore, the outer side of the buckle is provided with an extrusion slope, and the extrusion slope expands radially outward relative to the center of the rod from an end close to the base to an end far away from the base.

[0020] Furthermore, there are multiple buckles on the rod, the number of the slots corresponds to the number of the buckles, and the projection surface of the multiple buckles on the base is located between the inner wall and the outer wall of the base.

[0021] By means of the above technical solution, when the rod is connected to the base, one end of the buckle installed on the rod is inserted into the cavity of the base. When the extrusion force is applied to the rod, the extrusion slope of the buckle first contacts the cavity wall of the base. When the rod is gradually pressed into the base, the extrusion slope is gradually squeezed. At this time, the buckle radially shrinks relative to the central axis of the rod or the inner cavity of the base radially expands until the buckle is squeezed into the inner cavity of the base. Then, the buckle can fall into the groove of the inner wall of the base. At this time, the extrusion force on the extrusion slope of the buckle surface disappears, the buckle is in a reset state, and the buckle cannot be pulled out of the groove. However, it is mentioned in the above technical solution that the circumferential extension length of the groove on the base is greater than the circumferential extension length of the buckle on the rod, and the groove provides a rotatable space for the buckle. At this time, the matching state of the buckle and the groove is that the buckle cannot be pulled out of the groove, but the buckle can be rotated within the space allowed by the groove. Correspondingly, at this time, the rod cannot be pulled out of the base, but the base can rotate relative to the rod.

[0022] Furthermore, there are multiple discharge terminals on the circuit board, one of which is connected to the positive electrode of the battery cell through a connection sheet, and another of the multiple discharge terminals is connected to the negative electrode of the battery cell through a connection sheet.

[0023] Furthermore, the lock buckle is provided with a lock opening corresponding to the lock key on the power tool body, and after the lock opening and the lock key are locked and matched, the battery pack cannot be pulled out from the power tool body;

[0024] After the battery pack is inserted into the electric tool body, the electric tool power terminals on the electric tool body are inserted into the discharge terminals of the battery pack, and the electric tool power terminals are plugged and matched with the discharge terminals.

[0025] Compared with the prior art, the beneficial technical effect of the technical solution of the utility model is that after the battery pack of the present application is inserted into the main body of the electric tool, when locking and fixing the battery pack, it is only necessary to rotate the base of the battery pack, and the rod of the battery pack inserted into the main body of the electric tool does not need to be rotated. This design is particularly suitable for battery packs whose discharge terminals and power terminals are matched in a plug-in manner, and is also suitable for battery packs whose discharge terminals and power terminals are matched in a surface-to-surface contact manner, and has a wide range of promotion and use.

[0026] In addition, the utility model provides a battery pack and an electric tool assembly, including a battery pack and an electric tool adapted to cooperate with each other; the electric tool includes:

[0027] A battery installation portion, which is suitable for receiving, installing and connecting a battery pack;

[0028] An electric tool power terminal, which is suitable for combining with a discharge terminal of a battery pack;

[0029] The battery pack is inserted into the battery installation portion along the length direction of the central axis of the battery pack, and the power terminal of the power tool is inserted into the discharge terminal of the battery pack to complete the terminal matching;

[0030] The base of the battery pack is rotated in a radial plane perpendicular to the length direction of the axis, so that the lock buckle on the base of the battery pack is driven to rotate and lock with the lock key on the power tool.

[0031] The beneficial technical effects of the technical solution of the battery pack and electric tool assembly provided by the utility model are as described above and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of the structure of Example 1 of the present application;

[0034] Figure 2 This is a partial explosion diagram of Example 1 of the present application;

[0035] Figure 3 This is an explosion diagram of Example 1 of the present application;

[0036] Figure 4 This is the front view of Example 1 of the present application;

[0037] Figure 5 for Figure 4 Schematic diagram of the cross section along line AA;

[0038] Figure 6 for Figure 4 Schematic diagram of the cross section along line BB;

[0039] Figure 7 It is a side view of Example 1 of the present application;

[0040] Figure 8 for Figure 7 Schematic diagram of the cross section along the CC line;

[0041] Fig. 9 This is a schematic diagram of the structure of Example 2 of the present application.

[0042] Explanation of reference numerals: 100, battery pack; 10, base; 101, card slot; 102, rotation space; 11, rod; 111, buckle; 112, extrusion slope; 12, accommodating cavity; 13, battery cell; 14, circuit board; 15, discharge terminal; 16, opening; 17, lock buckle; 170, lock mouth; 18, positive electrode terminal; 19, negative electrode terminal; 200, power tool; 20, battery installation part; 21, power tool power terminal; 22, lock key; 300, battery pack and power tool assembly; DETAILED DESCRIPTION

[0043] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] Example 1

[0045] Reference Figure 1 , Figure 2 , Figure 3 A battery pack 100 includes a base 10 and a rod 11 connected to the base 10, wherein a receiving cavity 12 is provided in the rod 11, a battery cell 13, a circuit board 14 and a discharge terminal 15 mounted on the circuit board 14 are provided in the receiving cavity 12, the discharge terminal 15 is electrically connected to the battery cell 13, and an opening 16 corresponding to the discharge terminal 15 is provided on the rod 11;

[0046] Furthermore, a lock buckle 17 is provided on the base 10, and the base 10 and the rod 11 are rotatably matched, and the base 10 can rotate relative to the rod 11 around the central axis of the rod 11, so that the lock buckle 17 on the base 10 is locked and matched with the lock key on the power tool body where the battery pack is installed;

[0047] In this embodiment, refer to Figure 4 , Figure 5 There are multiple discharge terminals 15 on the circuit board 14, one of which is connected to the positive electrode of the battery cell 13 through the positive electrode connection sheet 18, and another of the multiple discharge terminals 15 is connected to the negative electrode of the battery cell 13 through the negative electrode connection sheet 19.

[0048] Furthermore, the lock buckle 17 is provided with a lock opening 170 corresponding to the lock key on the power tool body. After the lock opening 170 is locked with the lock key, the battery pack 100 cannot be pulled out from the power tool body.

[0049] Specifically, the base 10 of the present application is rotatably matched with the rod 11, the battery cell 13, the circuit board 14 and the discharge terminal 15 are integrated in the rod 11, when the battery pack 100 is installed on the power tool body, the rod 11 of the battery pack 100 is inserted into the mounting portion of the power tool body, the power tool connection terminal on the power tool body is inserted into the discharge terminal 15 of the battery pack 100, and the power tool connection terminal is plugged and matched with the discharge terminal 15. When the base 10 is rotated, the rod 11 inserted into the mounting portion of the power tool body remains stationary. After the base 10 is rotated to a certain installation position relative to the rod 11, the lock buckle 17 on the base 10 is locked and matched with the lock key on the power tool body. In the locked state, the entire battery pack 100 cannot be pulled out from the power tool body.

[0050] The advantage of this design is that after the battery pack 100 is inserted into the main body of the power tool, when locking and fixing the battery pack 100, it is only necessary to rotate the base 10 of the battery pack 100, and the rod 11 of the battery pack inserted into the main body of the power tool does not need to be rotated. This design is particularly suitable for battery packs whose discharge terminals and power terminals are matched in a plug-in manner, and is also suitable for battery packs whose discharge terminals and power terminals are matched in a surface-to-surface contact manner, and has a wide range of promotion and use.

[0051] Furthermore, in order to ensure that the rotationally matched base 10 and rod 11 do not loosen, the base 10 and rod 11 are connected to each other by a fastener, and the fastener includes a buckle 111 arranged on the rod 11, and a groove 101 corresponding to the buckle 111 is arranged on the inner wall of the base 10. When the rod 11 is inserted into the base 10, the buckle 111 is engaged with the groove 101. After the base 10 and rod 11 are connected to each other by the fastener, the base 10 and rod 11 limit each other in the direction of the central axis of the rod 11.

[0052] In addition, in order to ensure that the connected base 10 and rod 11 can rotate relative to each other, the circumferential extension length of the slot 101 on the base 10 is greater than the circumferential extension length of the buckle 111 on the rod 11, and the slot 101 provides a rotation space 102 for the buckle 111. After the buckle 111 is engaged with the slot 101, the buckle 111 and the slot 101 are mutually limited in the direction of the central axis of the rod 11. When the base 10 rotates relative to the rod 11, the buckle 111 can rotate circumferentially in the slot 101. When the end of the buckle 111 contacts the wall of the rotation space 102, the lock buckle 17 on the base 10 is locked with the lock key on the power tool body. That is to say, after the base 10 is rotated into place, the lock buckle 17 and the lock key are just locked into place, ensuring the accuracy of the locking of the battery pack 100 and the power tool body.

[0053] In addition, refer to Figure 6 , Figure 7 , Figure 8 The outer side of the buckle 111 has an extrusion slope 112, and the extrusion slope 112 expands radially outward relative to the center of the rod 11 from the end close to the base 10 to the end away from the base 10. Moreover, there are multiple buckles 111 on the rod 11, and the number of the slots 101 corresponds to the number of the buckles 111. The projection surface of the multiple buckles 111 on the base 10 is located between the inner wall and the outer wall of the base 10.

[0054] In summary, the purpose of the rod 11 and the base 10 cooperating with each other through the buckle 111 and the slot 101 is to facilitate the assembly of two independent rods 11 and the base 10. The base 10 and the rod 11 assembled by the buckle are mutually limited in the direction of the central axis of the rod 11. In this way, when a person holds the base 10, the rod 11 of the battery pack 100 can be pushed into the mounting portion of the power tool body, or the rod 11 can be pulled out from the mounting portion of the power tool body. When the battery pack 100 is pushed in or pulled out, the base 10 and the rod 11 are firmly connected and will not separate.

[0055] In addition, the circumferential extension length of the slot 101 on the base 10 is greater than the circumferential extension length of the buckle 111 on the rod 11. The purpose of this design is that after the buckle 111 is engaged with the slot 101, the rod 11 and the base 10 that are axially limited to each other can rotate together. When the base 10 rotates relative to the rod 11, the buckle 111 can rotate circumferentially in the slot 101. In this way, it can be ensured that the rod 11 and the base 10 that cooperate with each other cannot be separated, and the base 10 can rotate within the circumferential range allowed by the slot 101. After the rod 11 is inserted into the power tool body, the rod 11 does not move, and the battery pack 100 can be locked and fixed to the power tool body by rotating the base 10.

[0056] When the battery pack 100 is actually assembled, one end of the buckle 111 installed on the rod 11 is inserted into the cavity of the base 10. When the extrusion force is applied to the rod 11, the extrusion slope 112 of the buckle 111 first contacts the cavity wall of the base 10. When the rod 11 is gradually pressed into the base 10, the extrusion slope 112 is gradually squeezed. At this time, the buckle 111 is radially retracted relative to the central axis of the rod 11 or the inner cavity of the base 10 is radially expanded. After the buckle 111 is squeezed into the inner cavity of the base 10, the buckle 111 can fall into the slot 101 on the inner wall of the base 10. At this time, the extrusion slope 112 on the surface of the buckle 111 is The extrusion force disappears, and the buckle 111 is in a reset state. The buckle 111 cannot be pulled out of the slot 101. However, the above technical solution mentions that the circumferential extension length of the slot 101 on the base is greater than the circumferential extension length of the buckle 111 on the rod 11. The slot 101 provides a rotatable space for the buckle 111. At this time, the matching state of the buckle 111 and the slot 101 is that the buckle 111 cannot be pulled out of the slot 101, but the buckle 111 can be rotated within the space allowed by the slot 101. Correspondingly, the rod 11 cannot be pulled out of the base 10 at this time, but the base 10 can rotate relative to the rod 11.

[0057] Example 2

[0058] Reference Figure 5 , Fig. 9, the present application provides a battery pack and electric tool assembly 300, including a battery pack 100 and an electric tool 200 suitable for cooperating with each other, the battery pack 100 used is the battery pack mentioned in the above embodiment 1;

[0059] In this embodiment, the power tool 200 includes a battery installation portion 20 for accommodating and installing a battery pack 100, a power tool power terminal 21 combined with the discharge terminal 15 of the battery pack 100, and a lock key 22 corresponding to the lock buckle 17 on the above-mentioned battery pack 100 is provided on the power tool 200.

[0060] When installing the battery pack 100, the battery pack 100 is inserted into the battery installation portion 20 along the length direction of the central axis of the battery pack, and the power tool power terminal 21 is inserted into the discharge terminal 15 of the battery pack 100 to complete the terminal matching;

[0061] Then, the base 10 of the battery pack 100 is rotated in a radial plane perpendicular to the length direction of the central axis of the battery pack 100 , driving the lock buckle 17 on the base 10 of the battery pack to rotate and lock with the lock key 22 on the power tool 200 .

[0062] After the electric tool 200 adopts the battery pack 100 in Example 1, after the battery pack 100 is inserted into the main body of the electric tool, when locking and fixing the battery pack 100, it is only necessary to rotate the base 10 of the battery pack 100, and the rod of the battery pack inserted into the main body of the electric tool does not need to be rotated. This design is particularly suitable for battery packs whose discharge terminals and power terminals are matched in a plug-in manner, and is also suitable for battery packs whose discharge terminals and power terminals are matched in a surface-to-surface contact manner, and has a wide range of promotion and use.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A battery pack, comprising: base (10); A rod portion (11) connected to the base portion (10); The rod portion (11) is provided with a receiving cavity (12), the receiving cavity (12) is provided with a battery cell (13), a circuit board (14) and a discharge terminal (15) mounted on the circuit board (14), the discharge terminal (15) is electrically connected to the battery cell (13), and the rod portion (11) is provided with an opening (16) corresponding to the discharge terminal (15); Characterized in that a lock buckle (17) is provided on the base (10); The base (10) is rotationally matched with the rod (11), and the base (10) can be rotated relative to the rod (11) around the central axis of the rod (11) so that the lock buckle (17) on the base (10) is locked with the lock key on the power tool body on which the battery pack is installed.

2. The battery pack according to claim 1, characterized in that: The base (10) and the rod (11) are connected to each other via a fastener. After the base (10) and the rod (11) are connected to each other via the fastener, the base (10) and the rod (11) are mutually limited in the direction of the central axis of the rod (11).

3. The battery pack according to claim 2, characterized in that: The buckle comprises a buckle (111) arranged on the rod (11); a slot (101) corresponding to the buckle (111) is arranged on the inner wall of the base (10); when the rod (11) is inserted into the base (10), the buckle (111) is engaged with the slot (101).

4. The battery pack according to claim 3, characterized in that: The circumferential extension length of the slot (101) on the base (10) is greater than the circumferential extension length of the buckle (111) on the rod (11); after the buckle (111) is engaged with the slot (101), the buckle (111) and the slot (101) are mutually limited in the direction of the central axis of the rod (11); and the buckle (111) can rotate circumferentially within the slot (101).

5. The battery pack according to claim 4, characterized in that: The slot (101) provides a rotation space (102) for the buckle (111); when the base (10) rotates relative to the rod (11), the buckle (111) can rotate circumferentially within the slot (101); when the end of the buckle (111) contacts the wall of the rotation space (102), the lock buckle (17) on the base (10) is locked with the lock key on the power tool body.

6. The battery pack according to claim 4, characterized in that: The outer side of the buckle (111) is provided with an extrusion slope (112), and the extrusion slope (112) expands radially outward relative to the center of the rod (11) from an end close to the base (10) to an end away from the base (10).

7. The battery pack according to claim 4, characterized in that: The number of the buckles (111) on the rod (11) is multiple, the number of the slots (101) corresponds to the number of the buckles (111), and the projection surface of the multiple buckles (111) on the base (10) is located between the inner wall and the outer wall of the base (10).

8. The battery pack according to claim 1, characterized in that: There are multiple discharge terminals (15) on the circuit board (14), one of the discharge terminals (15) is connected to the positive electrode of the battery cell (13) via a connection sheet, and another of the multiple discharge terminals (15) is connected to the negative electrode of the battery cell (13) via a connection sheet.

9. The battery pack according to claim 5, characterized in that: The lock buckle (17) is provided with a lock opening (170) corresponding to a lock key on the electric tool body, and after the lock opening (170) is locked with the lock key, the battery pack cannot be pulled out from the electric tool body; After the battery pack is inserted into the electric tool body, the electric tool power connection terminal on the electric tool body is inserted into the discharge terminal (15) of the battery pack, and the electric tool power connection terminal is plugged into and matched with the discharge terminal (15).

10. A battery pack and electric tool assembly, characterized in that: It comprises a battery pack (100) and an electric tool (200) adapted to cooperate with each other; the electric tool (200) comprises: A battery installation portion (20), which is suitable for receiving, installing and connecting the battery pack (100); An electric tool power terminal (21), which is suitable for combining with a discharge terminal (15) of the battery pack (100); The battery pack (100) is inserted into the battery mounting portion (20) along the length direction of the central axis of the battery pack, and the electric tool power terminal (21) is inserted into the discharge terminal (15) of the battery pack (100), thereby completing terminal matching; The base (10) of the battery pack is rotated in a radial plane perpendicular to the length direction of the axis, so that the lock buckle (17) on the base (10) of the battery pack (100) is driven to rotate and lock with the lock key (22) on the electric tool (200).

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