Battery pack and electric tool thereof

Abstract

The utility model relates to a battery pack which comprises a battery pack shell, a locking piece, a plurality of battery cells, a battery cell support and a circuit board, the battery cell support, the plurality of battery cells and the circuit board are contained in the battery pack shell, each battery cell is installed on the battery cell support, the circuit board is arranged above the battery cells, and the locking piece is used for locking and installing the battery pack into an electric tool. An elastic piece is further arranged below the locking piece and used for resetting the locking piece, the battery cell support is provided with a positioning protrusion, the circuit board is provided with a through hole, the positioning protrusion penetrates through the through hole so that the circuit board can be positioned and installed on the battery cell support, the positioning protrusion is concaved inwards to form a groove, one end of the elastic piece is installed in the groove, and the other end of the elastic piece abuts against the locking piece. The battery cell support is provided with the positioning protrusions, the effect of rapidly positioning a circuit board can be achieved during manufacturing of a battery pack, the movable position of the elastic piece can be limited, pressing failure caused by displacement of the locking piece is prevented, the positioning protrusions also have the guiding effect, and the locking piece can be smoothly pressed.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more particularly to a battery pack and its power tool. Background Technology

[0002] Battery packs typically power power tools. A battery pack includes a casing containing several battery cells mounted on a cell support. A circuit board is mounted on the cell support, and the cells are connected to the circuit board via electrical connectors. A button is also located on the casing, allowing the battery pack to be detachably installed into the power tool. Generally, a spring mechanism is located inside the casing below the button to reset it. However, because this spring mechanism is usually exposed, button operation can be unsmooth. Repeated pressing can cause the spring mechanism to shift or become misaligned, leading to button malfunction. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a battery pack that can be smoothly pressed.

[0004] The battery pack includes a battery pack shell, a locking component, several battery cells, a battery cell bracket, and a circuit board. The battery pack shell houses the battery cell bracket, several battery cells, and the circuit board. Each battery cell is mounted on the battery cell bracket, and the circuit board is positioned above the battery cells. The locking component is used to lock the battery pack into a power tool. A spring-loaded component is also provided below the locking component for resetting the locking component. The battery cell bracket has a positioning protrusion, and the circuit board has a through hole. The positioning protrusion passes through the through hole, positioning the circuit board onto the battery cell bracket. The positioning protrusion is recessed to form a groove, and one end of the spring-loaded component is installed in the groove, while the other end abuts against the locking component.

[0005] Furthermore, positioning posts are respectively provided on both sides of the battery cell bracket, and the positioning posts pass through the circuit board to further position and install the circuit board onto the battery cell bracket.

[0006] Furthermore, both the positioning protrusion and the top of the positioning post have guide surfaces, which are used to guide the circuit board to be installed onto the battery cell bracket.

[0007] Furthermore, the battery cell support is provided with at least two opposing positioning posts, and the positioning protrusions are equidistant from the two positioning posts.

[0008] Furthermore, the battery cell support has a top surface, and sidewalls extend from the top surface away from the battery cell. Two sidewalls are joined with the top surface to form the positioning protrusion. One end of the elastic member abuts against the top surface, and the sidewalls confine the elastic member within the positioning protrusion.

[0009] Furthermore, the elastic element is a spring, and the sidewall is a cylindrical sidewall.

[0010] Furthermore, a mounting post is provided on the back of the locking member, one end of the spring is sleeved on the mounting post, and the other end is installed in the groove of the positioning protrusion.

[0011] Furthermore, the cell support includes a left support and a right support, which are respectively secured at both ends of each cell. The left support and the right support each form a semi-circular sidewall from the top surface. After the left support and the right support are spliced ​​together, the two semi-circular sidewalls form the cylindrical sidewall.

[0012] Furthermore, the circuit board is fixed to the battery cell bracket by fasteners.

[0013] Furthermore, this utility model also relates to a power tool, including the battery pack described above.

[0014] Beneficial effects:

[0015] The positioning protrusions on the battery cell bracket not only facilitate rapid positioning of the circuit board during battery pack manufacturing, but also restrict the movement of the elastic components, preventing the locking components from shifting and causing pressing failure. Additionally, the positioning protrusions act as guides, limiting the deformation of the locking components along the axial direction of the protrusions, allowing for smooth pressing of the locking components. Attached Figure Description

[0016] Figure 1 This is an exploded view of the battery pack in an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the battery pack cell support and circuit board assembly in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the hidden circuit board and top cover of the battery pack in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram of the battery cell support in an embodiment of this utility model.

[0020] Figure 5 This is a cross-sectional view of the battery pack in an embodiment of this utility model.

[0021] Reference numerals: Battery pack-100; Upper casing-11; Lower casing-12; Cell-2;

[0022] Cell bracket-3; retaining wall-31; upper end face-311; slot-32; positioning protrusion-33; positioning post-34; guide surface-331, 341; irregular retaining wall-31a; L-shaped slot-32a; recess-35;

[0023] Left support - 41; Right support - 42; Side facade - 411, 421; Top surface - 412, 422; Front side wall - 413, 423; Top surface - 414, 424; Side wall - 415, 425;

[0024] Circuit board-5; Electrical terminal-51; Through hole-50; Locking element-6; Mounting post-60; Elastic element-7; Electrical connector-8. Detailed Implementation

[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0026] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper" and similar terms are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0027] This embodiment discloses a battery pack 100, which can be detachably installed in a power tool to provide power to the power tool.

[0028] like Figure 1 As shown, the battery pack 100 includes a battery pack outer shell, which comprises an upper shell 11 and a lower shell 12. The battery pack outer shell houses several battery cells 2, a battery cell support 3, and a circuit board 5. Each battery cell 2 is mounted on the battery cell support 3. The circuit board 5 is positioned above the battery cells 2 and has electrical terminals 51. Each battery cell 2 also has an electrical connecting piece 8 on its side for connection to the circuit board 5. A locking member 6 is also provided on the upper shell 11 for locking the battery pack 100 into a power tool. An elastic member 7 is also provided between the locking member 6 and the battery cell support 3 for resetting the locking member 6. Figure 2 As shown, the cell support 3 is also provided with a positioning protrusion 33, and the circuit board 5 is provided with a through hole 50. The positioning protrusion 33 passes through the through hole 50, so that the circuit board 5 is positioned and installed onto the cell support 3. Therefore, when manufacturing the battery pack 100, the manufacturer can position the circuit board 5 by fitting the through hole 50 of the circuit board 5 onto the positioning protrusion 33 of the cell support 3. The positioning protrusion 33 plays a role in quickly positioning the circuit board 5, helping the manufacturer to quickly find the correct placement position of the circuit board 5 and improving manufacturing efficiency.

[0029] Furthermore, the positioning protrusion 33 is recessed to form a groove, one end of the elastic member 7 is installed in the groove of the positioning protrusion 33, and the other end abuts against the locking member 6. The positioning protrusion 33 restricts the movement of the elastic member 7, preventing the locking member 6 from shifting and causing the pressing to fail.

[0030] Therefore, the positioning protrusion 33 on the cell support 3 not only serves to quickly position the circuit board 5 during the manufacturing of the battery pack 100, but also restricts the movement of the elastic member 7, preventing the locking member 6 from shifting and causing pressing failure. In addition, the positioning protrusion 33 also serves as a guide, restricting the deformation of the locking member 6 along the axial direction of the positioning protrusion 33, so that the locking member 6 can be pressed smoothly.

[0031] Specifically, in this embodiment, such as Figure 4 As shown, the battery cell support 3 is assembled from a left support 41 and a right support 42. The left support 41 and right support 42 each include side facades 411 and 421, and front and rear side walls, respectively. After assembly, the front side walls 413 and 423 of the left support 41 and right support 42 are joined together, and the rear side walls are joined together. Side facades 411 and 421 are each provided with circular holes corresponding to the number of battery cells 2. The left support 41 and right support 42 respectively clamp the two ends of each battery cell 2, with the two ends of the battery cell 2 respectively secured in the circular holes of the left support 41 and right support 42.

[0032] The front sidewalls 413 and 423 of the left bracket 41 and the right bracket 42 have top surfaces 414 and 424, respectively. The left bracket 41 and the right bracket 42 extend from the top surfaces 414 and 424 in a direction away from the battery cell 2 to form sidewalls 415 and 425, respectively. These two sidewalls 415 and 425 are joined together to form a positioning protrusion 33. One end of the elastic member 7 abuts against the top surfaces 414 and 424, and the sidewalls 415 and 425 confine the elastic member 7 within the positioning protrusion 33.

[0033] In this embodiment, the elastic element 7 is a spring, so the left bracket 41 and the right bracket 42 form semi-circular sidewalls 415 and 425 from the top surfaces 414 and 424, respectively. After the left bracket 41 and the right bracket 42 are spliced ​​together, the two semi-circular sidewalls form a cylindrical sidewall.

[0034] Combination Figure 5 As shown, the locking member 6 includes a pressing part and a hook part. The pressing part is used for operation, and the hook part is used for connection with the power tool end to install the battery pack 100 onto the power tool. A mounting post 60 is provided on the back of the locking member 6. One end of the spring is sleeved on the mounting post 60, and the other end is installed in the groove of the positioning protrusion 33. The spring is constrained in the cylindrical sidewall.

[0035] Preferred, such as Figure 2 As shown, the left bracket 41 and the right bracket 42 are each provided with at least one facing positioning post 34, and the positioning protrusion 33 is equidistant from the two positioning posts 34. The positioning posts 34 pass through the circuit board 5, and the two positioning posts 34 and the positioning protrusion 33 form a three-point positioning, further positioning the circuit board 5 onto the cell bracket 3.

[0036] Combination Figure 3 As shown, the top of the positioning protrusion 33 and the positioning post 34 both have guide surfaces 331 and 341, which are used to guide the circuit board 5 to be installed onto the cell bracket 3.

[0037] Preferably, the battery cell support 3 also includes a retaining wall 31 extending away from the battery cell, the retaining wall 31 forming a recessed slot 32, in which the circuit board 5 is held.

[0038] The retaining wall 31 of the battery cell bracket 3 forms a slot 32 for accommodating the circuit board 5. The retaining wall 31 restricts the movement space of the circuit board 5, so the electrical terminals 51 set on the circuit board 5 are also restricted, avoiding the situation where the electrical terminals 51 of the circuit board 5 are severely worn due to high-frequency vibration during the operation of the power tool, resulting in the opening of the electrical terminals 51 becoming larger and ultimately the electrical connection failing.

[0039] Specifically, such as Figure 4As shown, the left support 41 and the right support 42 are each provided with at least one baffle 31. The side surfaces 411 and 412 of the left support 41 and the right support 42 have upper surfaces 412 and 422 respectively. The baffle 31 extends from the upper surfaces 412 and 422 in a direction away from the battery cell 2 and forms an upper end surface 311 parallel to the upper surfaces 412 and 422. The groove 32 formed by the recess of the baffle 31 has a bottom surface, which is the upper surface 412 and 422 of the left support 41 and the right support 42. The upper end surface 311 of the baffle 31 protrudes more in the direction away from the battery cell 2 than the bottom surface of the groove 32. Preferably, the upper end surfaces 311 of the several baffles 31 of the left support 41 and the right support 42 are spaced apart, but the corresponding bottom surfaces of each baffle 31 are connected. The circuit board 5 is placed on the bottom surface of the slot 32 and does not protrude from the upper end surface 311 of the retaining wall 31.

[0040] Preferred, such as Figure 3 As shown, one of the left support 41 and the right support 42 includes at least one irregularly shaped baffle 31a. The irregularly shaped baffle 31a is recessed inward to form an L-shaped slot 32a, in which one corner of the circuit board 5 is received. The L-shaped slot 32a, in conjunction with other slots 32, can further define the movement space of the circuit board 5, thus restricting both the long and short sides of the circuit board 5 and positioning the circuit board 5 within this movement space.

[0041] The card slot 32 has a side wall 321, which connects the upper end face 311 of the retaining wall 31 and the bottom surface of the card slot 32. There is a gap between the circuit board 5 and the side wall 321. The gap between the circuit board 5 and the side wall 321 of the card slot 32 is 0.1mm-0.5mm. This gap facilitates the placement of the circuit board 5 in the card slot 32.

[0042] Preferably, a recess 35 is also provided between adjacent retaining walls 31, which is used to accommodate the electrical connecting piece 8. One end of the electrical connecting piece 8 is welded to the end face of the battery cell 2, and the other end is welded to the circuit board 5.

[0043] In this embodiment, the circuit board 5 is fixedly connected to the battery cell bracket 3 by fasteners in order to secure the circuit board 5.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pack, comprising a battery pack housing, a locking member, a plurality of battery cells, a battery cell support, and a circuit board, wherein the battery pack housing houses the battery cell support, the plurality of battery cells, and the circuit board, each battery cell is mounted on the battery cell support, the circuit board is disposed above the battery cells, the locking member is used to lock the battery pack into a power tool, and an elastic member is further disposed below the locking member for resetting the locking member, characterized in that... The battery cell bracket is provided with a positioning protrusion, and the circuit board is provided with a through hole. The positioning protrusion passes through the through hole, so that the circuit board is positioned and installed on the battery cell bracket. The positioning protrusion is recessed to form a groove. One end of the elastic member is installed in the groove, and the other end abuts against the locking member.

2. The battery pack according to claim 1, characterized in that, Positioning posts are provided on both sides of the battery cell bracket. The positioning posts pass through the circuit board to further position and install the circuit board onto the battery cell bracket.

3. The battery pack according to claim 2, characterized in that, The top of both the positioning protrusion and the positioning post has a guide surface, which is used to guide the circuit board to be installed onto the cell bracket.

4. The battery pack according to claim 2, characterized in that, The battery cell bracket is provided with at least two opposing positioning posts, and the positioning protrusions are equidistant from the two positioning posts.

5. The battery pack according to claim 1, characterized in that, The battery cell support has a top surface, and sidewalls extend from the top surface away from the battery cell. Two sidewalls are joined together with the top surface to form the positioning protrusion. One end of the elastic member abuts against the top surface, and the sidewalls confine the elastic member in the positioning protrusion.

6. The battery pack according to claim 5, characterized in that, The elastic element is a spring, and the sidewall is a cylindrical sidewall.

7. The battery pack according to claim 6, characterized in that, The back of the locking element is provided with a safety feature. The column, the spring One end of the spring is sleeved on the mounting post, and the other end is installed into the recess of the positioning protrusion. In the trough.

8. The battery pack according to claim 6, characterized in that, The cell support includes a left support and a right support, which are respectively secured at both ends of each cell. The left support and the right support each form a semi-circular sidewall from the top surface. After the left support and the right support are spliced ​​together, the two semi-circular sidewalls form the cylindrical sidewall.

9. The battery pack according to claim 1, characterized in that, The circuit board is fixed to the battery cell bracket by fasteners.

10. A power tool, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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