Rechargeable power supply and power tool

Abstract

The application provides a rechargeable power supply, which comprises a shell, a circuit board, a plurality of battery cells and a plurality of connection terminals, the circuit board, the plurality of battery cells and the plurality of connection terminals are arranged in the shell, the connection terminals are electrically connected with the plurality of battery cells, the series connection and / or the parallel connection of the plurality of battery cells are realized, the connection terminals comprise first soldering legs, second soldering legs, first connecting pieces and second connecting pieces, the first soldering legs are welded to the battery cells, the second soldering legs are welded to the circuit board, the first soldering legs are connected with one of the first connecting pieces and the second connecting pieces, the first connecting pieces are connected with the second connecting pieces, and the first connecting pieces are located between the battery cells and the second connecting pieces. In the application, the second connecting pieces are arranged, which is beneficial to expand the heat dissipation area of the connection terminals, and then the heat dissipation effect of the battery cells is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a rechargeable power supply and an electric tool. Background Technology

[0002] Rechargeable power supplies such as battery packs and backpack battery packs have gradually replaced AC power for powering power tools due to their advantages such as portability, high safety, and long battery life. With the development of high-power power tools, the voltage and current of the power supply have also gradually increased, resulting in a corresponding increase in heat generation. Among these, the cylindrical battery cells located in the center (such as 18650, 21700, 26650, and 32650 cells) are particularly prone to overheating due to their difficulty in effective heat dissipation, leading to especially high temperature rises and severely impacting the performance and lifespan of the power supply. Utility Model Content

[0003] This application provides a rechargeable power supply that improves the heat dissipation of the battery cell through connection terminals.

[0004] Specifically, this application provides a rechargeable power supply, including a housing, a circuit board, multiple battery cells, and multiple connection terminals. The circuit board, multiple battery cells, and multiple connection terminals are disposed inside the housing. The connection terminals are electrically connected to the multiple battery cells to realize series and / or parallel connection of the multiple battery cells. The connection terminals include a first solder foot, a second solder foot, a first connecting piece, and a second connecting piece. The first solder foot is soldered to the battery cell, the second solder foot is soldered to the circuit board, the first solder foot is connected to one of the first connecting piece and the second connecting piece, the first connecting piece is connected to the second connecting piece, and the first connecting piece is located between the battery cell and the second connecting piece.

[0005] Furthermore, the first connecting piece and the second connecting piece are integrally connected, and the second connecting piece is bent relative to the first connecting piece to form a stacked structure.

[0006] Furthermore, the first connecting piece and the second connecting piece are connected by riveting, welding or threading.

[0007] Furthermore, the connecting terminal also includes a limiting portion, which is formed from the first connecting piece and fastened to the second connecting piece, thereby restricting the second connecting piece from moving away from the first connecting piece.

[0008] Furthermore, the first solder foot is connected to the first connecting piece, and the second connecting piece is provided with a clearance space, through which the first solder foot is exposed.

[0009] Furthermore, the housing includes an outer shell and a cell support, the cell is held inside the cell support, the circuit board is mounted on the cell support, and the cell support, circuit board, cell, and connecting terminal are all located inside the outer shell; the cell support is provided with a positioning protrusion, and the connecting terminal is provided with a positioning hole that mates with the positioning protrusion, the positioning hole penetrating through the first connecting piece and the second connecting piece.

[0010] Furthermore, the size of the first connecting piece is larger than the size of the second connecting piece, so that the edge of the first connecting piece is exposed.

[0011] Furthermore, the maximum operating voltage of the rechargeable power supply is not less than 40V.

[0012] On the other hand, this application also provides an electric tool, including a tool body and a rechargeable power supply as described above, wherein the tool body includes a power element and the rechargeable power supply supplies power to the power element.

[0013] In this application, by setting a second connecting piece, it is beneficial to expand the heat dissipation area of ​​the connecting terminal, thereby improving the heat dissipation effect of the battery cell. Attached Figure Description

[0014] Figure 1 This is a perspective view of a rechargeable power supply according to an embodiment of this application.

[0015] Figure 2 yes Figure 1 An exploded view of the rechargeable power supply is shown.

[0016] Figure 3 yes Figure 1 A front view of the connection terminals of the rechargeable power supply shown.

[0017] Figure 4 yes Figure 1 A side view of the connection terminals of the rechargeable power supply shown. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] Please combine Figures 1 to 4 This application provides a rechargeable power supply 100 for powering power tools such as electric drills, electric hammers, angle grinders, electric wrenches, chainsaws, and lawnmowers. For high-voltage battery packs, the cells located in the middle are surrounded by other cells, making it more difficult for them to dissipate heat. In this embodiment, the maximum operating voltage of the rechargeable power supply is, for example, not less than 40V, such as 40V, 60V, or 80V.

[0021] The rechargeable power supply 100 includes a housing 1, a circuit board 2, multiple battery cells 4, multiple connecting terminals 3, a docking seat 5, and a light guide 6. The multiple battery cells 4 are housed within the housing 1. Specifically, the housing 1 includes an outer shell 11 and a battery cell support 12. The outer shell 11 includes an upper shell 111 and a lower shell 112, which can be assembled with screws to form a receiving space. The battery cell support 12 includes a first support 121 and a second support 122, which are assembled horizontally to form a receiving cavity for the battery cells 4, specifically using a snap-fit ​​assembly method. The areas of the first support 121 and the second support 122 corresponding to both ends of the battery cells are open to facilitate welding to the connecting terminals 3.

[0022] The battery cell 4 is held within the battery cell support 12, and the circuit board 2 is mounted on the battery cell support 12. The battery cell support 12, circuit board 2, battery cell 4, and connecting terminal 3 are all located within the receiving space of the housing 11. A light guide 6 is partially exposed from the housing 11. The light guide 6 is used to transmit the light emitted by the LED light 21 of the circuit board 2 to the surface of the housing 1 to indicate the remaining power of the rechargeable power supply. The docking seat 5 is used to dock with the tool body of the power tool to achieve an electrical connection between the rechargeable power supply 100 and the tool body.

[0023] The connection terminal 3 electrically connects multiple battery cells 4 (two or four in this example) to realize the series and / or parallel connection of multiple battery cells 4. The specific connection method can depend on the actual needs. For example, if a large voltage is required, the battery cells are connected in series; if a large current is required, the battery cells are connected in parallel; if both a large voltage and a large current are required at the same time, more battery cells need to be added, and both series and parallel connections can be used.

[0024] In this embodiment, the connecting terminal 3 includes a first connecting piece 31, a second connecting piece 32, a first solder foot 33, and a second solder foot 34. There are multiple first solder feet 33, each used for soldering to a battery cell. The second solder feet 34 are soldered to the circuit board 2, used to electrically connect multiple battery cells 4 to the circuit board 2. The first connecting piece 31 is connected to the second connecting piece 32, and the first solder foot 33 is connected to one of the first and second connecting pieces. In this embodiment, the first solder foot 33 is connected to the first connecting piece 31. The second connecting piece 32 has a clearance space, through which the first solder foot 33 is exposed for soldering.

[0025] The first connecting piece 31 and the second connecting piece 32 are stacked, with the first connecting piece 31 located between the battery cell 4 and the second connecting piece 32. By setting the second connecting piece 32, the connecting terminal 4 forms a structure similar to a fin-shaped heat sink, which helps to increase the heat dissipation area of ​​the connecting terminal 4 and thus improve the heat dissipation effect of the corresponding battery cell.

[0026] Preferably, the first connecting piece 31 and the second connecting piece 32 are integrally connected, and the second connecting piece 32 is bent relative to the first connecting piece 31 to form a stacked structure. The connecting terminal 3 also includes a limiting part 35, which is formed from the first connecting piece 31 and fastened to the second connecting piece 32 to limit the second connecting piece 31 from moving away from the first connecting piece 32. Preferably, there are multiple limiting parts 35, which are arranged along the circumference of the second connecting piece 32. In other embodiments, the first connecting piece 31 and the second connecting piece 32 can also be connected by riveting, welding, or threaded parts (such as screws or bolts).

[0027] The size of the first connecting piece 31 is larger than that of the second connecting piece 32, so that the edge of the first connecting piece 31 is exposed, and the edge of the first connecting piece 31 is easy to dissipate heat directly.

[0028] The connecting terminal 3 is also provided with a positioning hole 36, which penetrates the first connecting piece 31 and the second connecting piece 32, wherein the opening area of ​​the second connecting piece corresponding to the positioning hole is larger. The side of the cell support 12 is provided with a positioning protrusion 120 that mates with the positioning hole 36 to assist in the alignment of the connecting terminal 3, making it easier to weld the first solder foot 33 to the corresponding cell 4.

[0029] The rechargeable power supply also includes an unlocking component 7 and a spring 8. The unlocking component 7 includes a latching part 71 that is connected to the tool body or charger and an unlocking part 72 that drives the latching part. The spring 8 is used to provide a latching retaining force for the latching part.

[0030] On the other hand, this application also provides a power tool, including a tool body (not shown) and a rechargeable power supply 100 as described above. The tool body includes a power element, such as a motor or heater, and the rechargeable power supply 100 supplies power to the power element. The power tool may be, for example, any one of the following: an electric drill, a hammer drill, an angle grinder, an electric wrench, a sander, a heat gun, a jigsaw, a reciprocating saw, a chainsaw, a lawnmower, a blower, etc.

[0031] In this application, by setting a second connecting piece, it is beneficial to expand the heat dissipation area of ​​the connecting terminal, thereby improving the heat dissipation effect of the battery cell and thus enhancing the heat dissipation performance of the entire rechargeable power supply.

[0032] 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 rechargeable power supply, comprising a housing, a circuit board, multiple battery cells, and multiple connecting terminals, wherein the circuit board, multiple battery cells, and multiple connecting terminals are disposed within the housing, and the connecting terminals are electrically connected to the multiple battery cells to realize series and / or parallel connection of the multiple battery cells, characterized in that, The connection terminal includes a first solder foot, a second solder foot, a first connecting piece, and a second connecting piece. The first solder foot is soldered to the battery cell, and the second solder foot is soldered to the circuit board. The first solder foot is connected to one of the first connecting piece and the second connecting piece. The first connecting piece is connected to the second connecting piece, and the first connecting piece is located between the battery cell and the second connecting piece.

2. The rechargeable power supply according to claim 1, characterized in that, The first connecting piece and the second connecting piece are integrally connected, and the second connecting piece is bent relative to the first connecting piece to form a stacked structure.

3. The rechargeable power supply according to claim 1, characterized in that, The first connecting piece and the second connecting piece are connected by riveting, welding or threaded parts.

4. The rechargeable power supply according to claim 2 or 3, characterized in that, The connecting terminal also includes a limiting part, which is formed from the first connecting piece and fastened to the second connecting piece, thereby restricting the second connecting piece from moving away from the first connecting piece.

5. The rechargeable power supply according to claim 4, characterized in that, The first solder foot is connected to the first connecting piece, and the second connecting piece is provided with a clearance space, through which the first solder foot is exposed.

6. The rechargeable power supply according to claim 1, characterized in that, The housing includes an outer shell and a cell support, the cell is held inside the cell support, the circuit board is mounted on the cell support, and the cell support, circuit board, cell, and connection terminals are all located inside the outer shell; The battery cell support is provided with a positioning protrusion, and the connecting terminal is provided with a positioning hole that cooperates with the positioning protrusion. The positioning hole passes through the first connecting piece and the second connecting piece.

7. The rechargeable power supply according to claim 6, characterized in that, The size of the first connecting piece is larger than the size of the second connecting piece, so that the edge of the first connecting piece is exposed.

8. The rechargeable power supply according to claim 1, characterized in that, The maximum operating voltage of the rechargeable power supply is not less than 40V.

9. A power tool, characterized in that, The tool includes a tool body and a rechargeable power supply as described in any one of claims 1 to 8, wherein the tool body includes a power element and the rechargeable power supply supplies power to the power element.

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