Battery pack and electric tool thereof

Abstract

The utility model discloses a battery pack which comprises a battery pack shell, a plurality of battery cells, a battery cell support and a circuit board are contained in the battery pack shell, the battery cells are installed on the battery cell support, the circuit board is arranged above the battery cells, and electrical terminals are arranged on the circuit board. The battery cell support comprises a retaining wall extending away from the battery cell, the retaining wall forms a concave clamping groove, and the circuit board is kept in the clamping groove. The retaining wall of the battery cell support forms the clamping groove used for containing the circuit board, and the retaining wall limits the moving space of the circuit board, so that the electrical terminals arranged on the circuit board are limited, and the situation that the electrical terminals of the circuit board are seriously abraded due to high-frequency vibration in the working process of the electric tool is avoided; therefore, the opening of the electric terminal is enlarged, and finally the electric connection is invalid.

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] In power tools, a battery pack provides power, and the battery pack is connected to the power tool via electrical terminals. High-power power tools experience high-frequency and high-volume vibration during operation. During high-frequency vibration, the electrical terminals of the battery pack wear out severely, causing the openings to widen and resulting in poor contact with the power tool. Simultaneously, the electrical connections between the battery cells and the circuit board can break due to high-frequency vibration, or the connections between the electrical connections and the battery cells may detach, leading to battery pack failure. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a battery pack that can stabilize the circuit board and prevent electrical terminal failure.

[0004] The battery pack includes a battery pack shell, which houses a plurality of battery cells, a battery cell support, and a circuit board. The battery cells are mounted on the battery cell support, and the circuit board is disposed above the battery cells. Electrical terminals are disposed on the circuit board. The battery cell support includes a retaining wall extending away from the battery cells, and the retaining wall forms a recessed slot in which the circuit board is held.

[0005] Furthermore, the barrier has an upper surface that is away from the battery cell, and the circuit board does not protrude from the upper surface of the barrier.

[0006] Furthermore, the battery cell support is provided with several of the baffles, and the slot formed by the baffles has a bottom surface. The upper surface of the baffle is more prominent than the bottom surface of the slot in the direction away from the battery cell. The bottom surfaces of each baffle are connected, and the circuit board is placed on the bottom surface.

[0007] Furthermore, the battery cell support includes at least one irregularly shaped baffle, which is recessed inward to form an L-shaped slot, and one corner of the circuit board is received in the L-shaped slot.

[0008] Furthermore, the slot has a sidewall that connects the upper surface of the retaining wall and the bottom surface of the slot, and there is a gap between the circuit board and the sidewall.

[0009] Furthermore, the gap between the circuit board and the sidewall of the card slot is 0.1mm-0.5mm.

[0010] Furthermore, the cell support includes a left support and a right support, which are respectively clamped at both ends of the cell, and each of the left and right supports is provided with at least one retaining wall.

[0011] Furthermore, the circuit board and the battery cell bracket are fixedly connected by fasteners.

[0012] Furthermore, the battery pack housing includes an upper housing and a lower housing. The inner wall of the upper housing is provided with at least one rib. When the upper housing is installed onto the lower housing, the rib is located above the upper end face of the retaining wall of the cell support.

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

[0014] Beneficial effects:

[0015] The retaining wall of the battery cell bracket forms a slot for accommodating the circuit board. The retaining wall restricts the movement space of the circuit board, and therefore the electrical terminals set on the circuit board are also restricted. This avoids the situation where the electrical terminals of the circuit board are severely worn due to high-frequency vibration during the operation of power tools, which would cause the opening of the electrical terminals to become larger and eventually lead to electrical connection failure. 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 schematic diagram of the upper cover in an embodiment of this utility model.

[0021] Figure 6 This is a cross-sectional view of the battery pack in an embodiment of this utility model.

[0022] Attached reference numerals: Battery pack-100; Upper casing-11; Rib-112; Lower casing-12; Cell-2;

[0023] Cell bracket-3; retaining wall-31; upper end face-311; slot-32; side wall-321; positioning protrusion-33; positioning post-34; guide surface-331, 341; irregular retaining wall-31a; L-shaped slot-32a; recess-35;

[0024] 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;

[0025] Circuit board-5; Electrical terminal-51; Through hole-50; Locking element-6; Elastic element-7; Electrical connector-8. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] This embodiment discloses a battery pack 100, which can be detachably installed in a power tool to provide power to the power tool.

[0029] like Figure 1 As shown, the battery pack 100 includes a battery pack outer shell, which includes an upper shell 11 and a lower shell 12. The battery pack 100 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 electrical terminals 51 are provided on the circuit board 5. The battery cells 2 also have electrical connecting pieces 8 on their sides that connect to the circuit board 5.

[0030] like Figure 2 As shown, the battery cell support 3 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.

[0031] 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.

[0032] Specifically, in this embodiment, combined with Figure 3 and 4 As shown, the battery cell support 3 includes a left support 41 and a right support 42. The left support 41 and right support 42 each include side facades 411 and 412, and front and rear side walls, respectively. The left support 41 and right support 42 can be spliced ​​together, so that 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. The side facades 411 and 412 are respectively 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, and the two ends of the battery cell 2 are respectively engaged in the circular holes of the left support 41 and right support 42.

[0033] The left support 41 and the right support 42 are each equipped with at least one retaining wall 31. For example... Figure 4 As shown, the side surfaces 411 and 412 of the left bracket 41 and the right bracket 42 have upper surfaces 412 and 422 respectively. A retaining wall 31 extends from the upper surfaces 412 and 422 in a direction away from the battery cell 2, forming an upper end surface 311 parallel to the upper surfaces 412 and 422. A recessed slot 32 formed by the retaining wall 31 has a bottom surface, which is the upper surface 412 and 422 of the left bracket 41 and the right bracket 42. The upper end surface 311 of the retaining wall 31 protrudes further from the bottom surface of the slot 32 in a direction away from the battery cell 2. Preferably, the upper end surfaces 311 of the several retaining walls 31 of the left bracket 41 and the right bracket 42 are spaced apart, but the corresponding bottom surfaces of each retaining wall 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.

[0034] 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.

[0035] 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.

[0036] Preferably, a recess 35 is 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.

[0037] Preferably, in this embodiment, combined with Figure 1 and 2 As shown, a locking member 6 is also provided on the upper housing 11 for locking the battery pack 100 into the power tool. An elastic member 7 is also provided between the locking member 6 and the cell support 3, for resetting the locking member 6. The cell support 3 is also provided with a positioning protrusion 33, and the circuit board 5 has a through hole 50. The positioning protrusion 33 passes through the through hole 50, allowing the circuit board 5 to be 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 serves to quickly locate the position of the circuit board 5, helping the manufacturer quickly find the correct placement position of the circuit board 5 and improving manufacturing efficiency.

[0038] 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.

[0039] Specifically, such as Figure 4As shown, 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. 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 groove of the positioning protrusion 33, and the sidewalls 415 and 425 restrict the elastic member 7 within the positioning protrusion 33.

[0040] 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.

[0041] The left bracket 41 and 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 system. Figure 3 As shown, the circuit board 5 is further positioned and installed onto the cell bracket 3.

[0042] 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.

[0043] To secure the circuit board 5, the circuit board 5 is fixedly connected to the cell support 3 by fasteners.

[0044] Combination Figure 5 and 6 As shown, at least one rib 112 is provided on the inner wall of the upper housing 11. When the upper housing 11 is installed onto the lower housing 12, the rib 112 is located above the upper end face 311 of the retaining wall 31. The rib 112 preferably corresponds one-to-one with the retaining wall 31. These ribs 112 can press down on the cell support 3, preventing the cell 2 from vibrating in the cell support 3, making the entire battery pack 100 structure more stable and robust.

[0045] 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, wherein the battery pack housing contains a plurality of battery cells, a battery cell support, and a circuit board, the battery cells are mounted on the battery cell support, the circuit board is disposed above the battery cells, and the circuit board is provided with electrical terminals, characterized in that, The battery cell support includes a retaining wall extending away from the battery cell, the retaining wall forming a recessed slot in which the circuit board is held.

2. The battery pack according to claim 1, characterized in that, The barrier wall has an upper surface that is away from the battery cell, and the circuit board does not protrude from the upper surface of the barrier wall.

3. The battery pack according to claim 2, characterized in that, The battery cell support is provided with several baffles, and the slot formed by the baffles has a bottom surface. The upper surface of the baffle is more prominent than the bottom surface of the slot in the direction away from the battery cell. The bottom surfaces of each baffle are connected, and the circuit board is placed on the bottom surface.

4. The battery pack according to claim 3, characterized in that, The battery cell support includes at least one irregularly shaped retaining wall, which is recessed inward to form an L-shaped slot, and one corner of the circuit board is received in the L-shaped slot.

5. The battery pack according to claim 3, characterized in that, The slot has a sidewall that connects the upper surface of the retaining wall and the bottom surface of the slot, and there is a gap between the circuit board and the sidewall.

6. The battery pack according to claim 5, characterized in that, The gap between the circuit board and the side wall of the card slot is 0.1mm-0.5mm.

7. The battery pack according to claim 1, characterized in that, The cell support includes a left support and a right support, which are respectively clamped at both ends of the cell. Each of the left and right supports is provided with at least one retaining wall.

8. The battery pack according to claim 1, characterized in that, The circuit board and the battery cell bracket are fixedly connected by fasteners.

9. The battery pack according to claim 2, characterized in that, The battery pack housing includes an upper housing and a lower housing. The inner wall of the upper housing is provided with at least one rib. When the upper housing is installed on the lower housing, the rib is located above the upper end face of the retaining wall of the cell support.

10. A power tool, characterized in that, The battery pack includes any one of claims 1 to 9.

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