Battery pack and electric tool

Abstract

A battery pack (100) and an electric tool. The battery pack (100) comprises: a battery case (1) having a first accommodating space; a battery module frame (15) provided in the first accommodating space, the battery module frame (15) having a second accommodating space; and a battery module (13), the battery module (13) comprising a first circuit board (14), the first circuit board (14) being mounted on one side of the battery module (13) and electrically connected to the battery module (13), and the battery module (13) and the first circuit board (14) being packaged in the second accommodating space. The battery module frame (15) is introduced into the battery case (1) of the battery pack (100), the battery module (13) and the first circuit board (14) are assembled and then packaged into the battery module frame (15) by potting, and the battery module (13) is isolated from the battery case (1) by the battery module frame (15), so that a potting space can be reduced, thereby reducing the product weight of the battery pack (100) and improving the energy density of the battery pack (100); the waterproof, dustproof and explosion-proof functions of the battery pack (100) can be effectively improved; and the structure of the entire battery pack (100) can be simplified.

Description

Battery pack and power tool TECHNICAL FIELD

[0001] The present application relates to the technical field of battery power supply, in particular to a battery pack and a power tool. BACKGROUND

[0002] Battery packs are widely used in power tools to provide power for the power tools. In the current soft-pack battery, multiple battery sheets are directly stacked into a battery pack, which is then installed together with a main board and a power board in the accommodating space of a battery shell, and then sealed by pouring glue. Since there is a large space between the battery shell and the battery pack, the main board and the power board, the pouring glue space is relatively large, and more pouring glue material needs to be filled, which increases the weight of the battery pack and limits the improvement of the energy density of the battery pack. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a battery pack and a power tool, which can reduce the pouring glue space and reduce the weight of the battery pack, thereby improving the energy density of the battery pack.

[0004] To achieve the above-mentioned purposes and other related purposes, the present application provides a battery pack, comprising:

[0005] a battery shell having a first accommodating space;

[0006] a battery pack frame arranged in the first accommodating space, the battery pack frame having a second accommodating space;

[0007] a battery pack; and

[0008] a first circuit board mounted on one side of the battery pack and electrically connected to the battery pack, and the battery pack and the first circuit board are packaged in the second accommodating space.

[0009] In an optional embodiment of the present application, the battery pack includes a plurality of soft-pack battery cells arranged in a first direction. In an optional embodiment of the present application, the first circuit board is arranged in a second direction of the plurality of soft-pack battery cells, and the second direction is perpendicular to the first direction.

[0010] In an optional embodiment of the present application, the battery pack further includes a light board mounted on the upper end of the battery pack frame and arranged in the first direction of the plurality of soft-pack battery cells, and the light board is electrically connected to the first circuit board.

[0011] In an optional embodiment of the present application, the battery shell includes a first shell and a second shell, and the second shell forms the first accommodating space with the first shell.

[0012] In an optional embodiment of the present application, the first shell is provided with a first opening, the first opening is arranged opposite to the lamp bead area of the lamp panel; the side of the first shell away from the lamp panel is provided with a transparent lampshade, and the transparent lampshade seals the first opening.

[0013] In an optional embodiment of the present application, the first shell is provided with a second opening, the second opening is arranged opposite to the touch area of the lamp panel, and a button is arranged in the second opening, the button is in contact with the touch area of the lamp panel.

[0014] In an optional embodiment of the present application, the battery pack further comprises a battery terminal assembly and a conductive strip assembly, the battery terminal assembly and the conductive strip assembly are mounted to the lower end of the battery group frame and arranged in the first direction of the plurality of soft package battery units, and the battery terminal assembly is electrically connected with the first circuit board through the conductive strip assembly.

[0015] In an optional embodiment of the present application, the battery pack further comprises a waterproof pad, the waterproof pad is arranged between the battery terminal assembly and the battery group frame.

[0016] In an optional embodiment of the present application, the battery pack further comprises a heat insulation sheet, the heat insulation sheet is arranged between the waterproof pad and the battery group frame.

[0017] In an optional embodiment of the present application, the conductive strip assembly comprises a plurality of conductive strips, and the battery terminal assembly comprises a plurality of connection terminals, the connection terminals are connected with a plurality of ports of the first circuit board through the conductive strips.

[0018] In an optional embodiment of the present application, the battery terminal assembly comprises a plurality of positive output terminals, a plurality of charging terminals, a plurality of communication terminals and a plurality of negative output terminals arranged at intervals, the center distance between the positive output terminals and the negative output terminals is between 34mm and 38mm, and the center distance between the communication terminals and the charging terminals is between 10mm and 14mm.

[0019] In an optional embodiment of the present application, the battery group frame comprises a nylon frame or a PVC frame with an opening on one side, and the opening is arranged in the second direction of the battery group frame.

[0020] In an optional embodiment of the present application, the energy density of the battery pack is greater than or equal to 170Wh / cm 3 and less than or equal to 290Wh / cm 3 .

[0021] In an optional embodiment of the present application, the energy density of the battery pack is greater than or equal to 169Wh / kg and less than or equal to 250Wh / kg.

[0022] In an optional embodiment of the present application, the battery pack further comprises a battery joint, a battery terminal assembly and a first magnetic attraction component, the battery joint is arranged in the battery housing, the battery terminal assembly is arranged in the battery joint, and the first magnetic attraction component is arranged in the battery joint, the battery pack can be assembled in the battery mounting portion of the tool body through the battery joint;

[0023] The battery mounting portion is provided with a tool terminal assembly and a second magnetic attraction component,

[0024] When the battery pack is mounted on the battery mounting portion of the tool body through the battery joint, the vibration frequency and / or gap between the tool terminal assembly and the battery terminal assembly can be reduced by the attraction force between the first magnetic attraction component and the second magnetic attraction component during tool operation.

[0025] In an optional embodiment of the present application, one of the first magnetic attraction component and the second magnetic attraction component is a permanent magnet, and the other is a permanent magnet or a metal piece that can be attracted by a permanent magnet; or

[0026] One of the first magnetic attraction component and the second magnetic attraction component is an electromagnet, and the other is a permanent magnet, an electromagnet or a metal piece that can be attracted by an electromagnet.

[0027] In an optional embodiment of the present application, the first magnetic attraction component is arranged at a position close to the battery terminal assembly of the battery joint, and the second magnetic attraction component is arranged at a position close to the tool terminal assembly of the battery mounting portion.

[0028] In an optional embodiment of the present application, the distance between the first magnetic attraction component and the second magnetic attraction component is less than or equal to 1mm.

[0029] In an optional embodiment of the present application, the battery pack further comprises a metal sacrificial piece, the metal sacrificial piece is electrically connected with the electrical connector of the battery pack, and the metal activity of the metal sacrificial piece is greater than the metal activity of the electrical connector.

[0030] To achieve the above object and other related objects, the present application further provides an electric tool comprising a tool and a battery pack;

[0031] The battery pack comprises:

[0032] A battery housing having a first accommodating space;

[0033] A battery pack frame arranged in the first accommodating space, the battery pack frame having a second accommodating space;

[0034] A battery pack; and

[0035] A first circuit board is mounted on one side of the battery pack and electrically connected to the battery pack, and the battery pack and the first circuit board are packaged in the second accommodating space.

[0036] The battery pack of the present application can reduce the space for pouring glue, thereby reducing the weight of the battery pack product and improving the energy density ratio of the battery pack, and can effectively improve the waterproof, dustproof and explosion-proof functions of the battery pack, and can also simplify the structure of the entire battery pack.

[0037] The battery pack of the present application can reduce the space for pouring glue, thereby reducing the weight of the battery pack product and improving the energy density ratio of the battery pack, and can effectively improve the waterproof, dustproof and explosion-proof functions of the battery pack, and can also simplify the structure of the entire battery pack.

[0038] The battery pack of the present application adopts the principle of sacrificial anode, and a metal sacrificial part with strong activity is added inside the battery pack and electrically connected to the electrical connector of the battery pack, and the metal activity of the metal sacrificial part is greater than that of the electrical connector. When in a humid and easily corroded environment, the metal sacrificial part will be corroded first, and the metal part in the battery pack that is electrically connected to the metal sacrificial part and has a smaller metal activity than the metal sacrificial part is protected, thereby delaying the corrosion of the battery pack, the electrical connector and other parts, improving the service life of the battery pack, and expanding the use occasions of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0039] FIG. 1 shows a perspective view of the electric tool of the present application in Example 1;

[0040] FIG. 2 shows a side view of the electric tool shown in FIG. 1;

[0041] FIG. 3 shows an exploded view of the electric tool shown in FIG. 1;

[0042] FIG. 4 shows an exploded view of the first housing of the battery pack shown in FIG. 1;

[0043] FIG. 5 shows a bottom view of the battery pack shown in FIG. 1 after removing the first housing and the second housing;

[0044] FIG. 6 shows a bottom view of the battery pack shown in FIG. 1;

[0045] FIG. 7 is a perspective view of the battery pack of the present application in Example 2;

[0046] Figure 8 is an exploded view of the battery pack shown in Figure 7;

[0047] Figure 9 is a cross-sectional view of the battery pack shown in Figure 7;

[0048] Figure 10 is a cross-sectional view of the battery pack shown in Figure 7 from another angle;

[0049] Figure 11 is a perspective view of the support frame for the battery pack shown in Figure 7;

[0050] Figure 12 is an exploded view of the structure of the first waterproof heat dissipation component of the battery pack shown in Figure 7.

[0051] Figure 13 is an exploded view of the structure of the second waterproof heat dissipation component of the battery pack shown in Figure 7;

[0052] Figure 14 is a perspective view of the heat dissipation component in the battery pack of Embodiment 3 of this application when it is in the first position;

[0053] Figure 15 is a perspective view of the heat sink in the battery pack of Embodiment 3 of this application when it is in the second position;

[0054] Figure 16 is an exploded view of the structure of Embodiment 3 of this application;

[0055] Figure 17 is a cross-sectional view of Embodiment 3 of this application;

[0056] Figure 18 is a cross-sectional view of Embodiment 3 of this application from another angle;

[0057] Figure 19 is a perspective view of the heat-conducting component of Embodiment 3 of this application;

[0058] Figure 20 is a perspective view of the heat sink of Embodiment 3 of this application;

[0059] Figure 21 is a perspective view of the charging system of Embodiment 4 of this application;

[0060] Figure 22 is an exploded view of the charging system shown in Figure 21;

[0061] Figure 23 is a schematic diagram of the battery pack structure of Embodiment 5 of this application;

[0062] Figure 24 is a schematic diagram of the structure in Embodiment 5 of this application where the electrical connector is mounted on the cell support via a metal sacrificial member.

[0063] Figure 25 is a schematic diagram of the structure in Embodiment 5 of this application, in which multiple individual battery cells are installed and integrated by a battery cell bracket.

[0064] Figure 26 is a schematic diagram of the structure of the first circuit board mounted on the cell support in Embodiment 5 of this application;

[0065] Figure 27 is a schematic diagram of the electrical connector in Embodiment 5 of this application;

[0066] Figure 28 is a structural schematic diagram of the cell holder in Embodiment 5 of the present application;

[0067] Figure 29 is a structural schematic diagram of the battery pack in Embodiment 5 of the present application;

[0068] Figure 30 shows a perspective view of the power tool in Embodiment 6 of the present application;

[0069] Figure 31 shows a perspective view of the tool body in Embodiment 6 of the present application;

[0070] Figure 32 shows a partial enlarged view of the tool body with the terminal holder removed in Embodiment 6 of the present application;

[0071] Figure 33 shows a perspective view of the terminal holder in Embodiment 6 of the present application;

[0072] Figure 34 shows a perspective view of the battery pack in Embodiment 6 of the present application and a circuit block diagram of the power supply system;

[0073] Figure 35 shows an exploded schematic diagram of the battery pack in Embodiment 6 of the present application;

[0074] Figure 36 shows a structural schematic diagram of the power tool with an electromagnet in Embodiment 6 of the present application. DETAILED DESCRIPTION

[0075] The present application is described in greater detail by the following specific examples. Other advantages and benefits of the present application will become apparent to those skilled in the art from this disclosure. The present application can be implemented or applied in other different specific embodiments, and the details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0076] It should be noted that the diagrams provided in the present embodiment only schematically illustrate the basic concept of the present application, and the diagrams only show the components related to the present application, not the number, shape and size of the components when actually implemented. The shape, number and ratio of the components when actually implemented can be arbitrarily changed, and the layout of the components can be more complex.

[0077] Embodiment 1

[0078] In order to improve the energy density of the battery pack, the present embodiment provides a battery pack 100 as shown in Figures 1-6, which can be used as the power supply of a power tool, and is assembled on the tool body of the power tool to supply power to the power tool. The power tool can be a lawn mower, a trimmer, a blower, a jigsaw, a sander, a grass trimmer, a cleaning machine, a vacuum cleaner, a drill, an electric hammer, a lawn mower, an electric wrench, a cleaning device, or other garden equipment or non-garden equipment.

[0079] Please refer to FIG. 1-6, the battery pack 100 includes a battery shell 1, a battery pack frame 15, a battery pack 13 and a first circuit board 14. The battery shell 1 has a first accommodating space, the battery pack frame 15 is arranged in the first accommodating space, the battery pack frame 15 has a second accommodating space; the first circuit board 14 is installed on one side of the battery pack 13 and is electrically connected with the battery pack 13, and the battery pack 13 and the first circuit board 14 are encapsulated in the second accommodating space by glue pouring. By introducing the battery pack frame 15 into the battery shell 1 of the battery pack 100, the battery pack 13 and the first circuit board 14 are encapsulated in the battery pack frame 15 after being assembled, the battery pack 13 is isolated from the battery shell 1 by the battery pack frame 15, which not only can reduce the glue pouring space, reduce the weight of the battery pack 100, improve the energy density ratio of the battery pack 100, but also can effectively improve the waterproof, dustproof and explosion-proof functions of the battery pack 100, and can also simplify the structure of the whole battery pack 100.

[0080] The technical solutions of the present application will be described in detail below with reference to the drawings.

[0081] Please refer to FIG. 1-6, the battery shell 1 is a sealed structure similar to a cuboid, mainly including a first shell 11 and a second shell 12. The first shell 11 is used as the upper cover of the battery pack, and the second shell 12 is an integrated structure and is used as the lower shell of the battery pack. The upper end of the second shell 12 is open, and the first shell 11 is connected to the upper end of the second shell 12 to close the second shell 12, forming a first accommodating space for accommodating the battery pack 13, the battery pack frame 15, the first circuit board 14, the battery terminal assembly 17 and the conductive row assembly 141. The first shell 11 and the second shell 12 can be detachably connected by clamping or bolt connection, which can facilitate maintenance, and the height direction of the battery shell 1, i.e. the up-down direction in FIG. 1-3, is defined as the first direction Z, and the width direction of the battery shell 1, i.e. the left-right direction in FIG. 1 and FIG. 3, is defined as the second direction Y, and the first direction Z is perpendicular to the second direction Y.

[0082] In order to improve the sealing performance, the connection between the first shell 11 and the second shell 12 can be coated with silicone sealant, and the gap between the first shell 11 and the second shell 12 is filled with silicone sealant to improve the sealing performance of the battery pack 100 and improve the waterproof effect of the whole battery pack 100.

[0083] Referring to FIGS. 1-6, the first shell 11 is provided with a first opening 115 and a second opening 114, the second opening 114 is located at one side of the first opening 115, the first opening 115 is arranged opposite to the lamp bead area of the lamp panel 16 or the lampshade of the lamp bead area, and the lamp panel 16 is electrically connected with the first circuit board 14; the second opening 114 is arranged opposite to the touch area of the lamp panel 16; the side of the first shell 11 away from the lamp panel 16 can form a transparent lampshade 111 by injection molding, the transparent lampshade 111 covers and seals the first opening 115, and the area of the transparent lampshade 111 opposite to the first opening 115 can be used as a display area of the battery pack 100 information, for displaying voltage information, current information, temperature information, remaining power information, Bluetooth state information, other alarm information and the like of the battery pack 100; the transparent lampshade 111 also extends to cover the edge of the second opening 114, and the transparent lampshade 111 is provided with a third opening 1111 aligned with the second opening 114 to avoid the soft rubber button 112; the side of the first shell 11 close to the lamp panel 16 forms the soft rubber button 112 by injection molding, the soft rubber button 112 is arranged at the second opening 114 and extends to cover the edge of the first opening 115, the first pressing part of the soft rubber button 112 is exposed outside through the second opening 114 and the third opening 1111, which is convenient for user operation, and the first pressing part of the soft rubber button 112 is in contact with the touch area of the lamp panel 16, so that the corresponding information of the battery pack 100 can be displayed on the transparent lampshade 111 by pressing the first pressing part.

[0084] In addition, in order not to affect the display of the transparent lampshade 111, the soft rubber button 112 is provided with a fourth opening 1121 aligned with the first opening 115.

[0085] Specifically, the transparent lampshade 111 covering the first opening 115 can be formed on the first shell 11 by injection molding, then the first shell 11 and the transparent lampshade 111 are placed in the mold of the soft rubber button 112, and the soft rubber button 112 covering the second opening 114 is formed by injection molding, so that the first shell 11, the transparent lampshade 111 and the soft rubber button 112 of the battery pack 100 form a seamless integrated structure, thereby achieving good waterproof effect. It can be understood that in other embodiments, the transparent lampshade 111 and the soft rubber button 112 can also be formed on the first shell 11 by other means such as pasting.

[0086] Referring to FIG. 1 and FIG. 2, at least one protrusion 113 can be provided on the first shell 11, which can be in the shape of a handle, so that the user can hold the battery pack 100 through the protrusion 113. When the number of protrusions 113 is one, the protrusion 113 can be provided on either end of the first shell 11, and when the number of protrusions 113 is more than one, the plurality of protrusions 113 are symmetrically provided on both ends of the first shell 11. The design of the protrusion 113 facilitates the user to hold the battery pack 100 to prevent slipping.

[0087] Referring to FIG. 6, the bottom of the second shell 12 is also provided with a water leakage hole 1201 to release water stains or moisture. This design helps to prevent water from accumulating inside the battery pack 100, thereby protecting the battery and related electronic components from moisture and water intrusion. This is particularly important for outdoor use or devices that may be exposed to a humid environment, effectively extending the service life of the battery pack 100 and improving its stability and reliability.

[0088] Referring to FIG. 1-FIG. 6, the battery pack frame 15 is generally a rectangular frame with an open side, the opening is arranged in the second direction Y of the battery pack frame, and the opening is opposite to one side of the battery shell 1. The inside of the opening serves as a second receiving space for accommodating the combination of the battery pack 13 and the first circuit board 14. In order to reduce the overall weight of the battery pack 100 and the electrical insulation requirement, the battery pack frame 15 can be selected as a nylon frame or a PVC frame with an open side.

[0089] Referring to FIG. 3, the battery pack 13 is formed by stacking a plurality of battery pieces along the first direction X, that is, the battery pack 13 includes a plurality of battery pieces arranged along the first direction, the battery pieces are isolated by foam, and the plurality of battery pieces are connected in series by lug welding. After being connected in series, a positive power interface and a negative power interface are formed. The first circuit board 14 is provided with an independent positive power interface welding point and an independent negative power interface welding point for carrying the positive power interface and the negative power interface formed after the plurality of battery pieces are connected in series. The first circuit board 14 is also provided with a plurality of collection welding points, each of which is welded to a battery piece. Each battery piece is a soft-pack battery unit.

[0090] The first circuit board 14 is used as the control board of the battery pack 100, and is integrated with a main board and a power board. The first circuit board 14 is installed at an opening of the battery group 13, i.e., the first circuit board 14 is located in the second direction Y of the soft-pack battery cell, and is used as a battery management system (BMS). On one hand, the BMS is used to collect voltage information, current information, temperature information, and remaining capacity information of each battery sheet, realize Bluetooth and data communication, charging switch control, driving of the lamp plate 16, and other functions. On the other hand, the BMS realizes discharge control, charging control, short-circuit protection, and other functions. The integrated design can not only save a circuit board and reduce installation difficulty, but also simplify the glue pouring process, so that the main board, the power board, and the battery group 13 can be packaged together through one glue pouring process.

[0091] The battery group 13 and the first circuit board 14 are welded to form a combination, and then are placed in the second accommodating space of the battery group frame 15. Then, the conductive row assembly 141 and the battery terminal assembly 17 are installed at the lower end of the battery group frame 15. The battery terminal assembly 17 and the conductive row assembly 141 are electrically connected through laser welding, soldering, bolts, or the like. Then, the battery group 13 and the first circuit board 14 are packaged in the second accommodating space between the battery group 13 to form an integral whole. This design can effectively improve the waterproof, dustproof, and explosion-proof functions of the battery pack 100, so that the safety performance of the battery pack 100 is improved. The battery group 13 is isolated from the battery shell 1 by the battery group frame 15, and the glue pouring space is limited in the range defined by the second accommodating space. Glue is not poured between the first shell 11 and the battery group frame 15, and between the battery group frame 15 and the second shell 12. Therefore, the glue pouring space can be reduced, the weight of the battery pack 100 is reduced, and the energy density ratio of the battery pack 100 is improved.

[0092] As shown in FIG. 3, the battery group frame 15 further has an upper bearing portion at the upper end and a lower bearing portion at the lower end. The upper bearing portion is used to install the lamp plate 16. The lamp plate 16 can be installed on the upper bearing portion by bolts or buckles, i.e., the lamp plate 16 is installed at the upper end of the battery group frame 15 and is arranged in the first direction Z of the soft-pack battery cell. The lower bearing portion is used to install the battery terminal assembly 17 and the conductive row assembly 141. The battery terminal assembly 17 and the conductive row assembly 141 can be installed on the lower bearing portion by bolts or buckles, i.e., the battery terminal assembly 17 and the conductive row assembly 141 are installed at the lower end of the battery group frame 15 and are arranged in the first direction Z of the soft-pack battery cell. The battery terminal assembly 17 is electrically connected to the first circuit board 14 through the conductive row assembly 141.

[0093] Specifically, the conductive bar assembly 141 includes a plurality of conductive bars connected by high-temperature insulating glue 1415, and the battery terminal assembly 17 includes a plurality of connection terminals, which are electrically connected to the plurality of ports of the first circuit board 14 through the conductive bars. The connection terminals and the conductive bars can be connected by laser welding, soldering, or bolting. The plurality of conductive bars are connected into a whole by the high-temperature insulating glue 1415, which not only facilitates installation, but also provides good insulation. The conductive bars include copper bars, aluminum bars, copper-clad aluminum bars, etc., such as copper bars. The design of the conductive bars allows large current to pass through, and the conductive bars, as good conductors of heat, expand the heat dissipation area and increase the heat dissipation effect of the battery pack 100, thereby effectively reducing the temperature of the battery pack 100 during charging and discharging, allowing the battery pack 100 to fully release energy and achieve complete energy utilization.

[0094] Referring to FIGS. 3, 5, and 6, the battery terminal assembly 17 includes a terminal seat and a plurality of connection terminals, and the terminal assembly is installed on the lower bearing portion of the battery pack frame 15 through the terminal seat. The plurality of connection terminals are installed on the terminal seat, and the bottom of the second housing 12 can be provided with a plurality of open channels, each of which matches a connection terminal. In order to prevent water from penetrating into the second housing 12 from the outside and causing a short circuit, a waterproof pad 18 can be provided between the terminal seat of the battery terminal assembly 17 and the lower bearing portion of the battery pack frame 15.

[0095] Referring to FIG. 3, a plurality of heat insulation sheets 19 are provided between the waterproof pad 18 and the battery pack frame 15, and the heat insulation sheets 19 are opposite to the positions of the connection terminals of the battery terminal assembly 17. The heat insulation sheets 19 can prevent the connection terminals from transmitting heat to the battery pack 100 during charging and discharging, which affects the safety of the battery pack 100. As an example, the heat insulation sheets 19 can be mica sheets.

[0096] Specifically, the connecting terminals of the battery terminal assembly 17 include four, which are the positive output terminal 171, the charging terminal 172, the communication terminal 173 and the negative output terminal 174, and the positive output terminal 171, the charging terminal 172, the communication terminal 173 and the negative output terminal 174 are arranged in intervals and are installed in the terminal seat; Correspondingly, the conductive strip assembly includes four conductive strips, which are the first conductive strip 1411, the second conductive strip 1412, the third conductive strip 1413 and the fourth conductive strip 1414, the positive output terminal 171 is connected with the positive output port of the first circuit board 14 through the first conductive strip 1411, the charging terminal 172 is connected with the charging port of the first circuit board 14 through the second conductive strip 1412, the communication terminal 173 is connected with the communication port of the first circuit board 14 through the third conductive strip 4013, and the negative output terminal 174 is connected with the negative output port of the first circuit board 14 through the fourth conductive strip 1414, that is, each connecting terminal is connected with a port of the first circuit board 14 through a conductive strip. And for safety considerations, the first conductive strip 1411 between the positive output terminal 171 and the first circuit board 14 is designed in sections, including two sections, the two sections are connected through a fuse 142, and the fuse 142 and the two sections can be connected through welding or bolt connection.

[0097] The terminal seat is also provided with three guide positioning grooves 175 for guiding and positioning, wherein the guide positioning groove 175 on one side is located between the positive output terminal 171 and the charging terminal 172, the guide positioning groove 175 in the middle is located between the charging terminal 172 and the communication terminal 173, and the guide positioning groove 175 on the other side is located between the communication terminal 173 and the negative output terminal 174. The center distance d3 between the positive output terminal 171 and the negative output terminal 174 is between 34mm-38mm, such as 34mm, 35mm, 36mm, 37mm, 38mm, the center distance d2 between the guide positioning grooves 175 on both sides is between 22mm-26mm, such as 22mm, 23mm, 24mm, 25mm, 26mm, and the center distance d1 between the communication terminal 173 and the charging terminal 172 is between 10mm-14mm, such as 10mm, 11mm, 12mm, 13mm, 14mm.

[0098] The battery pack 100 design of the present application can output a current of 60A or more for a battery pack 100 containing 15 strings and 20 strings of battery pieces.

[0099] For the battery pack 100 comprising 20 strings of lithium-ion battery pieces of the battery pack 13, with reference to the nominal voltage 3.6V of the lithium-ion single cell, the weight energy density (energy weight ratio) of the battery pack 100 comprising 20 strings of battery pieces can be greater than or equal to 169Wh / kg, and less than or equal to 250Wh / kg, such as 169Wh / kg, 170Wh / kg, 180Wh / kg, 190Wh / kg, 200Wh / kg, 210Wh / kg, 220Wh / kg, 230Wh / kg, 240Wh / kg, 250Wh / kg; the volume energy density (energy volume ratio) can be greater than or equal to 170Wh / cm 3 , and less than or equal to 290Wh / cm 3 , such as 170Wh / cm 3 , 180Wh / cm 3 , 190Wh / cm 3 , 200Wh / cm 3 , 210Wh / cm 3 , 220Wh / cm 3 , 230Wh / cm 3 , 240Wh / cm 3 , 250Wh / cm 3 , 260Wh / cm 3 , 270Wh / cm 3 , 280Wh / cm 3 , 290Wh / cm 3 .

[0100] The following gives several groups of measured data of the battery pack 100 of the battery pack 13 comprising 20 strings of lithium-ion battery pieces, with reference to the nominal voltage 3.60V of the lithium-ion single cell, the energy weight ratio of the 82V4AH battery pack 100 is 169.5Wh / Kg, the energy weight ratio of the 82V5.4AH battery pack 100 is 180.8Wh / Kg; the energy weight ratio of the 82V7AH battery pack 100 is 192Wh / Kg; the energy volume ratio of the 82V4AH battery pack 100 is 170Wh / cm 3 , the energy volume ratio of the 82V5.4AH battery pack 100 is 229Wh / cm 3 , and the energy volume ratio of the 82V7AH battery pack 100 is 254Wh / cm 3 . And with reference to the nominal voltage 3.69V of the lithium-ion single cell, the energy weight ratio of the 82V4AH battery pack 100 is 173.7Wh / Kg, the energy weight ratio of the 82V5.4AH battery pack 100 is 185.4Wh / Kg; the energy weight ratio of the 82V7AH battery pack 100 is 196.8Wh / Kg; the energy volume ratio of the 82V4AH battery pack 100 is 174.5Wh / cm 3The energy volume ratio of the 82V 5.4AH battery pack 100 is 235.5 Wh / cm 3 The energy volume ratio of the 82V 7AH battery pack 100 is 261.1 Wh / cm 3 Although the cell density is further improved, the energy mass ratio and the energy volume ratio of the battery pack 100 of different specifications can be further improved.

[0101] The battery pack 100 of the embodiment can also be provided with a metal sacrificial part in the battery pack 100 as in the technical solution of Embodiment 5 below, the metal sacrificial part is electrically connected with the tab, the conductive row assembly 141, the battery terminal assembly 17 and other electrical connectors of the battery pack, and the metal activity of the metal sacrificial part is greater than that of the electrical connectors, when in a humid environment, the metal sacrificial part will be corroded first, and the metal part of the battery pack which is electrically connected with the metal sacrificial part and has a smaller metal activity than the metal sacrificial part is protected, thereby delaying the corrosion of the battery pack, the battery pack, the electrical connectors and the like, prolonging the service life of the battery pack and expanding the use occasions of the battery pack.

[0102] The battery pack 100 of the embodiment can also be provided with a first magnetic attraction part at the battery joint of the battery pack 100 and a second magnetic attraction part at the battery mounting part of the tool body as in the technical solution of Embodiment 6 below, so that when the battery pack 100 is mounted on the battery mounting part of the tool body through the battery joint, the vibration frequency and / or gap between the tool terminal assembly and the battery terminal assembly is reduced by the attraction force between the first magnetic attraction part and the second magnetic attraction part during the operation of the tool, thereby reducing the probability of poor contact between the tool terminal assembly and the battery terminal assembly, avoiding the sparking between the tool terminal assembly and the battery terminal assembly, and prolonging the service life of the whole machine.

[0103] Embodiment 2

[0104] High power and fast charging and discharging are the current development direction of batteries. In order to obtain high power, a plurality of single battery modules are connected in series to form a battery pack, and high voltage direct current is generated through series connection. When the charging and discharging rate is higher, the temperature of the battery pack rises faster. However, temperature has a double effect on the battery. Specifically, as the temperature rises, the internal resistance of the battery decreases, thereby improving the efficiency of the battery. However, a higher temperature will accelerate the rate of harmful chemical reactions and cause permanent damage to the structure of the battery. Based on this, the embodiment also provides a battery pack which can simultaneously meet the waterproof and active heat dissipation functions.

[0105] Please refer to FIGS. 7 to 13, the battery pack 100 includes a battery shell 1, a first cell support 2, a cell monomer 3 and a waterproof heat dissipation assembly.

[0106] In the embodiment, the battery housing 1 is rectangular and made of plastic. The battery housing 1 is provided with an interface (not shown) for connecting with an external device (a power tool or an external power source) to charge or discharge the battery cells 3 in the battery pack 100.

[0107] The battery housing 1 includes a first housing 11 and a second housing 12, which enclose a first accommodating space. In the embodiment, the first housing 11 and the second housing 12 are fixedly connected by bolts or the like to improve the sealing performance of the battery housing 1 and prevent water, dust, and the like from entering the first accommodating space and damaging the battery cells 3. In other embodiments, the first housing 11 and the second housing 12 can be lockingly connected or detachably connected to facilitate the user to check and maintain the battery cells 3.

[0108] Referring to FIG. 11 in combination with FIGS. 8-9, the first battery cell support 2 is disposed in the first accommodating space and includes a first support 21 and a second support 22. The first support 21 and the second support 22 are symmetrically disposed and vertically arranged along a second direction perpendicular to the extending direction (defined as a first direction) of the battery cells 3. A plurality of mounting positions 23 for mounting the battery cells 3 are formed between the first support 21 and the second support 22. The battery cells 3 are mounted on the mounting positions 23 to seal the two ends of the battery cells 3 in the mounting positions 23 in the circumferential direction. By disposing the first battery cell support 2 in the first accommodating space of the battery housing 1, the battery cells 3 are sealed in the upward and downward directions, and finally sealed in the battery pack 100, so that the battery pack 100 is waterproof as a whole.

[0109] A plurality of mounting portions 24 for mounting electrical connecting pieces are provided on the side of the first support 21 and the second support 22 away from each other, and a plurality of battery cells 3 are connected by the electrical connecting pieces to form at least two battery cell groups, and a gap 33 is provided between adjacent battery cell groups, and the electrical connecting pieces are, for example, metal connecting pieces. In the embodiment, the battery pack 100 includes two battery cell groups, i.e., a first battery cell group 31 and a second battery cell group 32, and the first battery cell group 31 and the second battery cell group 32 have a gap 33 therebetween, and the gap 33 is used to mount a first waterproof heat dissipation assembly 4 of a waterproof heat dissipation assembly to transfer the heat generated by the battery cell groups through the first waterproof heat dissipation assembly 4 in the gap 33, and at the same time, the first waterproof heat dissipation assembly 4 seals and fixes the battery cells 3. Of course, in other embodiments, the battery pack 100 can include more than two battery cell groups, which is not limited in the present application.

[0110] The waterproof heat dissipation assembly includes a first waterproof heat dissipation assembly 4 and a second waterproof heat dissipation assembly 5. The first waterproof heat dissipation assembly 4 is arranged on the side of the first cell support 2 facing the cell monomer 3 and located in the gap 33, and the second waterproof heat dissipation assembly 5 is arranged on the side of the first cell support 2 facing the battery shell 1 and at least partially connected with the battery shell 1. That is, the first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 are arranged on the two sides of the first cell support 2 respectively, and the first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 are both sealingly connected with the first cell support 2, and the first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 share the same first heat dissipation channel 411. By arranging the first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 on the two sides of the first cell support 2 respectively, that is, arranging the first waterproof heat dissipation assembly 4 in the gap 33 of the cell group and arranging the second waterproof heat dissipation assembly 5 on the battery shell 1, the first waterproof heat dissipation assembly 4 is used to sealingly fix the cells in the cell group, and at the same time, the two ends of the cell monomer 3 are sealingly connected with the first cell support 2 to prevent the cell monomer 3 from entering water. The second waterproof heat dissipation assembly 5 is used to seal between the first cell support 2 and the battery shell 1 to prevent the inside of the battery shell 1 from entering water. In addition, the first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 share the same first heat dissipation channel 411, which can quickly dissipate heat, so that the battery pack 100 can simultaneously meet the functions of waterproof, dustproof and rapid active heat dissipation.

[0111] As shown in FIG. 12, the first waterproof heat dissipation assembly 4 includes a heat conduction piece 41 and two first waterproof pieces 42, the two first waterproof pieces 42 are respectively located on the two sides of the heat conduction piece 41 and respectively located on the two sides of the first heat dissipation channel 411, and each first waterproof piece 42 is sealingly connected with the heat conduction piece 41 and the first cell support 2. Optionally, the sealing connection refers to the sealing of the contact surface of the first waterproof piece 41 with the first cell support 2 and the heat conduction piece 41.

[0112] The extension direction of the heat conduction piece 41 is parallel to the extension direction of the cell monomer 3, that is, the heat conduction piece 41 extends along the first direction. Preferably, the heat conduction piece 41 can be a metal heat conduction block, or a phase change cooling material, such as a heat conduction material, etc.

[0113] The heat conducting member 41 comprises an outer surface 413 facing the electric cell group and an inner surface 412 opposite to the outer surface 413. The outer surface 413 can be a surface matching the electric cell monomer 3. For example, in the embodiment, the outer surface 413 is a plurality of connected arc surfaces matching the arc shape of the electric cell monomer 3, so that the heat conducting member 41 has a larger contact area with the electric cell monomer 3, facilitating the active heat dissipation of the electric cell monomer 3 through the heat conducting member 41. Moreover, the outer surface 413 of the heat conducting member 41 can wrap the electric cell monomer 3 in the circumferential direction, so that the heat conducting member 41 and the first electric cell support 2 cooperate to seal and fix the electric cell monomer 3 in the circumferential direction.

[0114] A first heat dissipation channel 411 is formed in the middle of the heat conducting member 41. The first heat dissipation channel 411 extends in the first direction and is used for heat dissipation of the electric cell monomer 3. A plurality of stripe protrusions 4121 are arranged on the inner surface 412 of the heat conducting member 41 facing the first heat dissipation channel 411. The stripe protrusions 4121 are arranged to increase the area of the inner surface 412 of the heat conducting member 41, thereby increasing the heat dissipation area and facilitating the heat dissipation of the battery pack 100.

[0115] Further, along the extension direction of the first heat dissipation channel 411, two first waterproof members 42 are arranged at the two ends of the heat conducting member 41 and located on the side of the first support 21 and the second support 22 facing the heat conducting member 41. The two first waterproof members 42 can seal the two ends of the electric cell monomer 3. Meanwhile, the first waterproof members 42 and the heat conducting member 41 cooperate to seal the first support 21 and the second support 22, preventing water from entering the inside of the battery shell 1.

[0116] Further, the inner surface 412 and the outer surface 413 have a certain thickness, forming a connecting surface 414. The shape of the first waterproof member 42 is the same as that of the connecting surface 414. In this way, the first waterproof member 42 is sealingly attached to the heat conducting member 41, and the first waterproof member 42 seals the heat conducting member 41 and the first electric cell support 2. Meanwhile, the first hole 421 in the middle of the first waterproof member 42 has the same shape as the first heat dissipation channel 411, facilitating heat dissipation. In the embodiment, the first waterproof member 42 is a first waterproof foam, and in other embodiments, the first waterproof member 42 can also be other waterproof sealing members.

[0117] Please refer to Fig. 13 and combine with Figs. 7-10, in the embodiment, two second waterproof heat dissipation assemblies 5 are arranged, and the two second waterproof heat dissipation assemblies 5 are respectively arranged on two sides of the first heat dissipation channel 411, and each of the two second waterproof heat dissipation assemblies 5 comprises a heat dissipation piece 51 and a second waterproof piece 52 arranged on a side of the heat dissipation piece 51 facing the first cell support 2, and the second waterproof piece 52 sealingly connects the first cell support 2 and the heat dissipation piece 51 (the battery case 1). Optionally, the sealing connection refers to that the second waterproof piece 52 is in contact with the first cell support 2 and the heat dissipation piece 51.

[0118] The heat dissipation piece 51 is provided with a plurality of first heat dissipation holes 512, and the first heat dissipation holes 512 are in communication with the first heat dissipation channel 411, so as to facilitate heat generated by the cell monomer 3 to be dissipated through the heat dissipation channel 411 and the first heat dissipation holes 512.

[0119] Optionally, in the embodiment, the heat dissipation piece 51 is provided with a plurality of fences 511, the plurality of fences 511 are arranged in parallel along the second direction and are of different sizes, so as to be matched with the shape of the first heat dissipation channel 411. In other embodiments, the plurality of fences 511 can also be arranged in parallel along the first direction, and the like, which are not limited in the application. The adjacent fences 511 have the first heat dissipation holes 512 in communication with the first heat dissipation channel 411. That is, in the embodiment, the heat dissipation piece 51 is a protective windshield arranged on the battery case 1. The fences 511 are arranged to prevent the user from being scalded by mistake. Because the inside of the battery pack 100 is relatively hot before and after use, it can scald the skin, and the fences 511 are arranged to protect the user. At the same time, the arrangement of the first heat dissipation holes 512 also facilitates the ventilation and heat dissipation of the first heat dissipation channel 411. In addition, the strip-shaped fence 511 can also be used as an external hanging support rib, which facilitates the user to hang and store the battery pack 100 when the battery pack 100 is not used.

[0120] Further, the two heat dissipation pieces 51 are arranged on two sides of the battery case 1. The battery case 1 is provided with a fifth opening 121 corresponding to the position of the heat dissipation piece 51, and a plurality of stepped support portions 122 are arranged on the edge of the fifth opening 121, so as to be connected with the heat dissipation piece 51. At the same time, the plane where the outermost layer of the heat dissipation piece 51 is located is the same plane as the plane where the battery case 1 is located, so as to improve the appearance of the battery pack 100.

[0121] The second waterproof member 52 is arranged on the side of the heat dissipation member 51 facing the first cell holder 2. That is, the first waterproof member 42 and the second waterproof member 52 are arranged on the two sides of the first cell holder 2 respectively. Referring to Fig. 8, the first waterproof member 42 and the second waterproof member 52 are arranged on the left and right sides of the first holder 21 respectively, wherein the first waterproof member 42 is arranged on the inner side of the first holder 21 to seal and fit the connecting surface 414 of the heat conduction member 41, so as to seal and connect the heat conduction member 41 and the first holder 21. The second waterproof member 52 is arranged on the outer side of the first holder 21 to tightly fit the heat dissipation member 51, so as to seal and connect the first holder 21 and the battery case 1. Similarly, the first waterproof member 42 and the second waterproof member 52 are arranged on the two sides of the second holder 22 respectively, so as to seal and connect the second holder 22 and the heat conduction member 41 and the battery case 1.

[0122] Preferably, the middle part of the second waterproof member 52 is provided with a second channel 521, which is matched with the shape of the first heat dissipation channel 411. Preferably, the second waterproof member 52 is a second waterproof foam, and in other embodiments, the second waterproof member 52 can also be other waterproof sealing members.

[0123] Further, the first holder 21 and the second holder 22 are provided with a ventilation opening 25 corresponding to the position of the first heat dissipation channel 411, so as to facilitate heat dissipation. The first waterproof member 42 and the second waterproof member 52 are arranged on the two sides of the ventilation opening 25 respectively, and are both sealed and connected with the first cell holder 2, so as to prevent water and dust from entering the installation position 23 of the first cell holder 2 to corrode the cell monomer 3.

[0124] Further, the heat dissipation member 51, the second waterproof member 52, the first cell holder 2, the first waterproof member 42 and the heat conduction member 41 are all provided with a fixing hole 7, and a fastener 8 passes through the heat dissipation member 51, the second waterproof member 52, the first cell holder 2, the first waterproof member 42 and the heat conduction member 41 in sequence, so as to fixedly connect the heat dissipation member 51 and the heat conduction member 41, and simultaneously seal and fixedly connect the first waterproof member 42 and the second waterproof member 52 with the first cell holder 2.

[0125] Further, the cell monomer 3 is wrapped with a heat absorption member 6 on the outer side, and the cell monomer 3 is connected with the heat conduction member 41 through the heat absorption member 6. The heat absorption member 6 can be a phase change material, which is used to actively absorb the heat of the cell monomer 3, so as to actively dissipate the heat of the cell monomer 3.

[0126] The waterproof heat dissipation process of the battery pack 100 of the present application is as follows: the heat generated by the battery monomer 3 is actively absorbed by the heat absorbing member 6, the heat absorbing member 6 transmits the heat to the heat conducting member 41, and then the heat is dissipated along the first direction through the first heat dissipation channel 411. Since the first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 share the same first heat dissipation channel 411, the heat is transmitted to the heat dissipation member 51 through the first heat dissipation channel 411, and then is quickly dissipated through the first heat dissipation holes 512 on the heat dissipation member 51. At the same time, the first heat dissipation channel 411 can also be blown and cooled through the first heat dissipation holes 512 on the heat dissipation member 51. Although the battery shell 1 of the battery pack 100 is not completely sealed due to the existence of the first heat dissipation holes 512 on the heat dissipation member 51, the first waterproof member 42 and the second waterproof member 52 seal the first battery holder 2, that is, the second waterproof member 52 seals the connecting surface of the battery shell 1 and the first battery holder 2, and the first waterproof member 42 seals the first battery holder 2 and the heat conducting member 41. At the same time, the first waterproof member 42 and the heat conducting member 41 also seal the first battery holder 2 and the battery monomer 3, so that the external water vapor and dust can only contact the first heat dissipation channel 411 in the middle of the heat conducting member 41, but cannot contact the battery monomer 3, thereby improving the waterproof and dustproof effect and prolonging the service life of the battery pack 100.

[0127] The battery pack 100 of the present embodiment can quickly transmit the heat of the battery monomer 3 to the first heat dissipation channel 411 through the first waterproof heat dissipation assembly 4 and then dissipate the heat through the second waterproof heat dissipation assembly 5, and can also seal the two ends of the battery group and the first battery holder 2 through the first waterproof heat dissipation assembly 4 to prevent water from entering the battery group, and seal the battery shell 1 and the first battery holder 2 through the second waterproof heat dissipation assembly 5 to prevent water from entering the local part of the battery shell 1, so that the battery pack 100 can simultaneously meet the functions of waterproof, dustproof and quick active heat dissipation. In addition, the inner surface 412 of the heat conducting member 41 is provided with a stripe protrusion 4121 to increase the heat dissipation area and improve the heat dissipation effect. Furthermore, a plurality of fences 511 are arranged on the heat dissipation member 51 to prevent the user from being burned by the high temperature inside the battery pack 100 before and after use. At the same time, the stripe fence 511 can be used as an external suspension support rib to facilitate the user to hang and store the battery pack 100 when the battery pack 100 is not in use.

[0128] Embodiment 3

[0129] Please refer to FIG. 15 to FIG. 20, the embodiment provides another battery pack 100 which can meet the waterproof and active heat dissipation function at the same time. Similar to the embodiment 2, the battery pack 100 also includes the battery shell 1, the first cell support 2, the cell monomer 3 and the waterproof heat dissipation assembly. In the embodiment, most of the structure and working principle of the battery pack 100 are the same as the embodiment 1, the difference is the structure of the heat dissipation piece 51 and the heat conduction piece 41. The following description mainly describes the differences, and the same points are not described here.

[0130] In the embodiment, the heat dissipation piece 51 is a sealed structure, and is in sliding connection with the battery shell 1. The battery shell 1 has a first position and a second position. When the heat dissipation piece 51 is located at the first position, the first heat dissipation channel 411 is sealed by the heat dissipation piece 51 to prevent water and dust. When the heat dissipation piece 51 is located at the second position, the first heat dissipation channel 411 is in communication with the outside, at this time, ventilation and heat dissipation can be carried out, and since the first heat dissipation channel 411 of the heat conduction piece 41 instead of the cell monomer 3 contacts the outside, when the heat dissipation piece 51 is in the second position, it can also play a waterproof effect on the cell monomer 3, realizing the waterproof and heat dissipation effect of the battery pack 100.

[0131] Further, the heat dissipation piece 51 is provided with a first sliding part 5131, and the battery shell 1 is provided with a second sliding part 123, and the heat dissipation piece 51 is in sliding connection with the battery shell 1 through the first sliding part 5131 and the second sliding part 123, so that the heat dissipation piece 51 can reciprocate between the first position and the second position.

[0132] In the embodiment, the two heat dissipation pieces 51 are an integral structure, including two extension arms 513 arranged symmetrically and a connecting arm 514 for connecting the two extension arms 513. At least one side of the extension arm 513 facing the connecting arm 514 is provided with a sliding groove, and the battery shell 1 is provided with a sliding rail corresponding to the position of the sliding groove, and the heat dissipation piece 51 is in sliding connection through the sliding groove and the sliding rail. In other embodiments, the two heat dissipation pieces 51 can also be a split structure, arranged symmetrically, each including an extension arm 513 and a connecting arm 514, and each extension arm 513 is provided with a sliding groove, and correspondingly, the battery shell 1 is provided with a sliding rail. Alternatively, the extension arm 513 is provided as a sliding rail, and the battery shell 1 is provided as a sliding groove. The present application does not limit this.

[0133] Further, the height of the fifth opening 121 of the battery shell 1 is greater than the height of the extension arm 513 of the heat dissipation piece 51, so as to form a space part 124 on the battery shell 1, facilitating the switching of the heat dissipation piece 51 between the first position and the second position.

[0134] Further, the heat dissipation member 51 is located at least partially in the first heat dissipation channel 411, and a first elastic member 9 is arranged between the heat dissipation member 51 and the heat conduction member 41. The side of the heat dissipation member 51 away from the second waterproof member 52 is provided with a pushing portion 5132. Under the action of an external force, the pushing portion 5132 is pushed to switch the heat dissipation member 51 from the first position to the second position. The first elastic member 9 has a tendency to switch the heat dissipation member 51 from the second position to the first position under the action of its own elastic force.

[0135] Specifically, the connecting arm 514 of the heat dissipation member 51 passes through the first heat dissipation channel 411 of the heat conduction member 41. The heat conduction member 41 is provided with a bearing arm 415 corresponding to the position of the connecting arm 514 to bear and position the connecting arm 514. The side of the connecting arm 514 away from the bearing arm 415 is provided with a first protruding column 515. The inner surface 412 of the heat conduction member 41 extending towards the bearing arm 415 forms a second protruding column 416 in the direction of the bearing arm 415. A first elastic member 9 is arranged between the first protruding column 515 and the second protruding column 416. In this embodiment, the first elastic member 9 is a spring, and the elastic force direction of the spring is parallel to the second direction. The side of the heat dissipation member 51 away from the second waterproof member 52 (i.e., the side facing the outside) is provided with a pushing portion 5132 to facilitate user pushing, so that the heat dissipation member 51 is switched between the first position and the second position.

[0136] When there is no external force, the heat dissipation member 51 remains in the first position under the action of the elastic force of the first elastic member 9. Under the action of the heat dissipation member 51, the first waterproof member 42, the second waterproof member 52, and the heat conduction member 41, the waterproof and dustproof effect of the battery pack 100 is achieved. Under the action of an external force, the pushing portion 5132 is pushed, and the connecting arm 514 is moved away from the bearing arm 415 under the action of the external force, thereby compressing the first elastic member 9. At this time, the heat dissipation member 51 is switched from the first position to the second position, thereby achieving the effects of ventilation, heat dissipation, and waterproofing. When the external force disappears, the connecting arm 514 moves towards the bearing arm 415 under the action of the elastic force of the first elastic member 9, and is positioned by the bearing arm 415.

[0137] Further, a stop portion (not shown) can also be arranged on the heat dissipation member 51 or the heat conduction member 41. When the external force disappears, the heat dissipation member 51 can be kept in the second position under the action of the stop portion, i.e., the battery pack 100 is always in the state of ventilation and heat dissipation. When only waterproofing and dustproofing are needed without heat dissipation, the heat dissipation member 51 can be separated from the stop portion, thereby returning to the first position under the action of the elastic force of the first elastic member 9.

[0138] In this embodiment, the heat dissipation member 51 has the first position and the second position, so that the first position and the second position can be switched according to the use scenario of the battery pack 100, thereby meeting the waterproof and dustproof functions of the battery pack 100, and also achieving the active heat dissipation function.

[0139] The battery pack 100 of the present embodiment can quickly transfer the heat of the battery monomer 3 through the first waterproof heat dissipation assembly 4 to the first heat dissipation channel 411 and then through the second waterproof heat dissipation assembly 5 to dissipate the heat, and can prevent the battery monomer group from being waterlogged by sealing the two ends of the battery monomer group with the first battery holder 2 through the first waterproof heat dissipation assembly 4 and can prevent the battery housing 1 from being waterlogged by sealing the battery housing 1 and the first battery holder 2 through the second waterproof heat dissipation assembly 5, so that the battery pack 100 can simultaneously satisfy the functions of waterproofing, dustproofing, and fast active heat dissipation. In addition, the inner surface 412 of the heat conduction member 41 is provided with a stripe protrusion 4121 to increase the heat dissipation area and improve the heat dissipation effect. Furthermore, the heat dissipation member 51 is provided with a plurality of fences 511 to prevent the skin from being burned by the high temperature inside the battery pack 100 before and after use. At the same time, the stripe fence 511 can be used as an external suspension support rib to facilitate the user to suspend and store the battery pack 100 when the battery pack 100 is not in use.

[0140] Embodiment 4

[0141] Please refer to FIGS. 21-22, the present embodiment provides a charging system 200, which includes a base 20 and a battery pack 100. The battery pack 100 can be the battery pack 100 of embodiment 2 or the battery pack 100 of embodiment 3. For the sake of clarity, the following description takes the battery pack 100 of embodiment 2 as an example for detailed description, but it should not be limited thereto.

[0142] The base 20 is provided with a plurality of accommodating grooves 201, and the plurality of accommodating grooves 201 are arranged side by side in the interior of the base 20 and are configured to accommodate the battery pack 100. An electrical connection part 202 is arranged in each accommodating groove 201 and is configured to electrically connect with the battery pack 100 to charge the battery pack 100 or facilitate the discharge of the battery pack 100. The charging system 200 further includes a heat dissipation structure, which includes a fan (not shown) arranged in the base 20 and located between adjacent accommodating grooves 201, and an air inlet (not numbered) and an air outlet 203 of the fan arranged on the base 20.

[0143] The battery pack 100 is arranged in the accommodating groove 201, and is electrically connected with the charging system 200 through the electrical connection part 202 to perform charging or discharging. The battery pack 100 comprises a battery shell 1, a first cell support 2, cell monomers 3 and a waterproof heat dissipation assembly. The battery shell 1 has a first accommodating space, the first cell support 2 is arranged in the first accommodating space and has a plurality of mounting positions 23. The cell monomers 3 are arranged in the mounting positions 23 and comprise at least two cell groups. A gap 33 is arranged between adjacent cell groups. The waterproof heat dissipation assembly comprises a first waterproof heat dissipation assembly 4 and a second waterproof heat dissipation assembly 5. The first waterproof heat dissipation assembly 4 is arranged on a side of the first cell support 2 facing the cell monomers 3 and is located in the gap 33. The second waterproof heat dissipation assembly 5 is arranged on a side of the first cell support 2 facing the battery shell 1 and is at least partially connected with the battery shell 1. The first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 are both sealingly connected with the first cell support 2, and the first waterproof heat dissipation assembly 4 and the second waterproof heat dissipation assembly 5 share the same first heat dissipation channel 411.

[0144] When the battery pack 100 is placed in the accommodating groove 201 on the base 20, the first heat dissipation channel 411 of the battery pack 100 is opposite to the air outlet 203 of the fan. Thus, when the battery pack 100 is charging or discharging, the fan can blow or suck air to the battery pack 100 to quickly transfer the heat generated by the battery pack 100 to the heat conducting member 41 through the heat absorbing member 6, and then quickly dissipate the heat to the outside through the first heat dissipation channel 411 of the heat conducting member 41 and the first heat dissipation holes 512 on the heat dissipation member 51, so as to realize the quick heat dissipation function of the battery pack 100 and reduce the temperature of the battery pack 100.

[0145] Embodiment 5

[0146] During the welding process of the electrical connection part, the cell protection layer is inevitably damaged. During use and storage, the battery pack is often placed in a humid environment, which is easy to cause corrosion of the shell, electrode and electrical connection part of the cell, reduce the sealing performance and insulation performance of the battery, and may cause safety problems such as short circuit and liquid leakage, reduce the service life of the battery, and even cause the battery to overheat, catch fire or explode.

[0147] In order to delay the corrosion inside the battery pack, as shown in FIGS. 23-29, the embodiment provides a battery pack comprising cell monomers 3, electrical connection parts 26 and metal sacrificial parts 29. The cell monomers 3 are provided in plurality. The electrical connection parts 26 are connected in series and / or parallel with the plurality of cell monomers 3. The metal sacrificial parts 29 are electrically connected with at least one of the electrical connection parts 26 or the metal shell of the cell monomers 3. The metal activity of the metal sacrificial parts 29 is greater than the metal activity of the electrical connection parts 26, and the metal activity of the metal sacrificial parts 29 is greater than the metal activity of the metal shell.

[0148] The application adopts the principle of sacrificial anode, and a metal (or alloy) part with strong activity is added in the battery pack and connected to the electrical connector 26 or the metal shell, so that the metal sacrificial part 29 and the electrical connector 26 and the metal shell of the battery cell 3 are conductive and serve as a sacrificial anode. For example, in the battery pack, a more active metal such as zinc or a more active alloy such as zinc-aluminum alloy can be used as the metal sacrificial part 29, which is connected to the electrical connector 26, the metal shell of the battery cell 3, etc. When in a humid or easily corroded environment, the metal sacrificial part 29 will preferentially lose electrons and undergo oxidation due to its stronger activity, and the metal sacrificial part 29 will be corroded first, while the metal parts in the battery pack that are electrically connected to the metal sacrificial part 29 and have a lower metal activity than the metal sacrificial part 29 are protected, thereby delaying the corrosion of the battery cell 3, the electrical connector 26, the first circuit board 14, the battery terminal assembly 17, etc. in the battery pack, thereby improving the service life of the battery pack, expanding the use of the battery pack, improving the safety of the battery pack, facilitating assembly, improving assembly efficiency, and avoiding more new problems. This technology can also be used for corrosion protection of metal parts such as the metal shell of the electric tool, the garden tool, the vehicle, and the motor.

[0149] Referring to FIGS. 23-24, in the present embodiment, the metal sacrificial part 29 is detachably connected to the electrical connector 26 or the metal shell. It should be noted that the metal sacrificial part 29 can be directly connected to the electrical connector 26 or the metal shell, and the metal sacrificial part 29 is detachably connected to the electrical connector 26 or the metal shell. When the metal sacrificial part 29 is completely corroded, it can be easily replaced, thereby improving the convenience of use. It can be understood that in other embodiments, the metal sacrificial part 29 can be fixedly connected to the electrical connector 26 or the metal shell by welding or the like.

[0150] Referring to FIGS. 23-25, in the present embodiment, the battery pack further comprises a second battery cell support 27, and each battery cell 3 is installed and integrated by the second battery cell support 27 and / or arranged with a gap between each battery cell 3. It should be noted that the second battery cell support 27 is generally made of insulating material, such as plastic material or wood; the second battery cell support 27 is provided to facilitate the integration of the numerous scattered battery cells 3 into a whole; the battery cells 3 are arranged with a gap therebetween, so that the second battery cell support 27 can effectively isolate the battery cells 3 and prevent accidental contact between adjacent battery cells 3, thereby reducing the risk of short circuit. Furthermore, the battery cells 3 are installed with a gap therebetween by the second battery cell support 27, which can facilitate heat dissipation between the battery cells 3 and prevent local overheating, thereby improving the safety performance of the battery.

[0151] Please refer to FIG. 23-FIG. 24, at least one electrical connector 26 is fixed to the second battery cell support 27 by a metal sacrificial part 29, and the electrical connector 26 is detachably connected with the second battery cell support 27. It should be noted that the metal sacrificial part 29 can be provided with one or more, and the metal sacrificial part 29 is a threaded connector or a clamping connector, and the threaded connector is a screw or a bolt. By installing the electrical connector 26 through the threaded connector, it can prevent the electrical connector 26 from loosening under vibration or impact, maintain the stability of the electrical connection, so that the metal sacrificial part 29 can not only be used for corrosion prevention, but also has the function of connection, thereby making the metal sacrificial part 29 diversified in function.

[0152] In the battery pack, the battery cell monomer 3 can be multiple, and the multiple battery cell monomers 3 can be connected in series or parallel or mixed connection. The mixed connection means that there are series connection and parallel connection among the multiple battery cell monomers 3, as long as it can meet the normal use of the battery pack. In this embodiment, the multiple battery cell monomers 3 can be connected in series or parallel or mixed connection as multiple battery cell groups first, and the multiple battery cell groups are connected in series or parallel or mixed connection as a battery cell module.

[0153] Please refer to FIG. 23, FIG. 27, the electrical connector 26 is a conductive sheet, which is usually made of metal or carbon material and has good electrical conductivity. Compared with traditional wires, the conductive sheet exhibits lower resistance and less power loss during current transmission, thereby improving the electrical conductivity efficiency. Its design simplifies the installation process and eliminates the need for complex wiring and wiring steps. In particular, when the metal sacrificial part 29 is installed on the conductive sheet, compared with the use of metal wires, this connection method is more convenient and effectively avoids the problem of easy breakage of wires. In addition, the conductive sheet usually has better wear resistance and corrosion resistance. Since the metal wire is usually fixed only at the connection point, the rest part may be loose with the metal sacrificial part 29 due to shaking, which will affect the protection effect of the metal sacrificial part 29 on the metal wire and the metal shell of the battery cell monomer 3. In contrast, the conductive sheet has stable electrical conductivity and structural stability, so that the metal sacrificial part 29 can be stably connected through the hole on the conductive sheet, thereby maintaining a low maintenance cost in long-term use.

[0154] Referring to FIG. 23, the length direction of the battery pack 100 is defined as the X direction, the width direction of the battery pack 100 is defined as the Y direction, and the thickness direction of the battery pack 100 is defined as the Z direction; that is, the battery pack 100 is generally cuboid-shaped, and in the case where the battery pack 100 is in a flat state, that is, the case where the large face of the battery pack 100 is parallel to the horizontal plane, the extension direction of the edge with the longest length in the large face of the battery pack 100 is the length direction, and the height direction of the battery pack is the thickness direction. Along the length and / or thickness direction of the battery pack, the projection of the metal sacrificial part 29 at least partially coincides with the projection of the battery cell 3, so as to ensure that the metal sacrificial part 29 does not exceed the arrangement range of the battery cell 3, which improves the space utilization and reduces the structural size of the battery pack 100, and is conducive to the miniaturization design of the battery pack 100.

[0155] Referring to FIG. 23 and FIG. 27, in the embodiment, the electrical connecting part 26 includes a main body part 261 and a first extension part 264, the main body part 261 is electrically connected with the battery cell 3, the first extension part 264 is connected with the edge of the main body part 261, and the metal sacrificial part 29 is connected with the first extension part 264.

[0156] It should be noted that the electrical connecting part 26 has a dual structure of the main body part 261 and the first extension part 264. The main body part 261 is the core area of the electrical connecting part 26, and is specially responsible for realizing the stable electrical connection between adjacent battery cells 3 and ensuring the smooth transmission of current, and is the key to the continuity of the internal circuit of the battery pack. The first extension part 264 is arranged to place the metal sacrificial part 29, which is an important element for protecting the electrical connecting part 26 from corrosion, in a relatively independent position, that is, on the first extension part 264. Such a layout strategy has multiple advantages: first, by placing the metal sacrificial part 29 on the first extension part 264, direct physical or electromagnetic interference of the metal sacrificial part 29 on the main body part 261 of the electrical connecting part 26 is effectively avoided, and it is ensured that the main body part 261 can focus on its core electrical connection function. Second, the existence of the first extension part 264 makes the arrangement of the metal sacrificial part 29 more flexible, which can be adjusted according to the specific space conditions inside the battery pack, is helpful for further compact design, and improves the overall space utilization, which is particularly important for the battery pack design pursuing miniaturization and light weight. Third, the metal sacrificial part 29 is located on the first extension part 264, which not only protects the main body part 261 of the electrical connecting part 26 from corrosion, but also provides a safer and more stable working environment for itself, which is conducive to prolonging the service life of the metal sacrificial part 29; fourth, since the metal sacrificial part 29 is arranged independently from the main body part 261, it is more convenient and faster to operate when checking or replacing.

[0157] Please refer to FIG. 23-FIG. 24, in the embodiment, the battery cells 3 are arranged in a rectangular array in the length direction and the width direction in the battery pack and are spaced apart, so as to balance the temperature distribution of the battery pack, disperse the risk and stress concentration of the battery cells 3, and improve the use safety of the battery pack.

[0158] Please refer to FIG. 23-FIG. 24, in the embodiment, the extension direction of the main body part 261 and the extension direction of the first extension part 264 are crossed, and the extension direction of the main body part 261 and the extension direction of the first extension part 264 are respectively arranged obliquely relative to the length direction of the battery pack, it should be understood that the extension direction of the main body part 261 and the extension direction of the first extension part 264 can also be respectively arranged obliquely relative to the width direction of the battery pack, or the extension direction of the main body part 261 and the extension direction of the first extension part 264 can also be respectively arranged obliquely relative to the height direction of the battery pack; when the main body part 261 is parallel to the plane defined by the length and width directions of the battery pack, the main body part 261 and the first extension part 264 are respectively inclined relative to the length direction and the width direction; when the main body part 261 is parallel to the plane defined by the length and height directions of the battery pack, the main body part 261 and the first extension part 264 are respectively inclined relative to the length direction and the height direction; when the main body part 261 is parallel to the plane defined by the width and height directions of the battery pack, the main body part 261 and the first extension part 264 are respectively inclined relative to the width direction and the height direction.

[0159] The optimized arrangement of the main body part 261 and the first extension part 264, on the one hand, helps to optimize the current transmission path between the battery cells 3, reduces the resistance, and improves the overall conductivity efficiency, on the other hand, the main body part 261 and the first extension part 264 are arranged obliquely relative to one of the faces of the battery pack, so that the electrical connector 26 can better adapt to the space structure inside the battery pack, for example, the first extension part 264 is located at the sharp corner of the second battery cell support 27, thereby reasonably utilizing the sharp corner area of the second battery cell support 27, improving the space utilization of the battery pack, and thereby facilitating the optimization and adjustment of the overall battery pack structure.

[0160] Please refer to FIG. 24, in the present embodiment, the main body 261 and the metal sacrificial member 29 are located on the same surface of the second cell holder 27, or the main body 261 is located on the first surface of the second cell holder 27, and the metal sacrificial member 29 is located on the second surface of the second cell holder 27, and the first surface and the second surface are adjacent. It should be noted that, for example, the first surface is located on the side of the electrode direction of the cell monomer 3, and the second surface is located on the side of the side direction of the cell monomer 3. At the same time, the same surface includes the case where a groove is provided on the surface, for example, one of the main body 261 and the metal sacrificial member 29 is located on the outer surface of the second cell holder 27, and the other is located in the groove on the outer surface, or both are located in the groove on the outer surface, which can be considered as being located on the same surface; and when the first surface and the second surface are connected by a chamfered surface, they should be considered as adjacent surfaces.

[0161] By limiting the relative positions of the main body 261 and the metal sacrificial member 29, when the plurality of cell monomers 3 are arranged in a rectangular array in the battery pack, the main body 261 and the metal sacrificial member 29 can be completely in different spatial positions, so that the area of the first surface does not need to be increased for the arrangement of the metal sacrificial member 29, which is beneficial to improve the space utilization of the entire battery pack.

[0162] Please refer to FIGS. 23-24, in the present embodiment, the metal sacrificial member 29 is located on the side away from other cell monomers 3 of the outermost cell monomer 3 among the plurality of cell monomers 3, because the side away from other cell monomers 3 of the outermost cell monomer 3 usually has a larger vacant area, and the space is used to arrange the metal sacrificial member 29, which not only effectively fills the space that may be wasted, but also ensures that the function of the metal sacrificial member 29 is effectively exerted. Thus, the space utilization inside the battery pack is improved, the entire battery pack is more compact, and the miniaturization design of the battery pack is facilitated. In addition, placing the metal sacrificial member 29 in such a relatively independent position also helps to reduce its potential interference with other cell monomers 3, and ensures the stability and reliability of the battery pack.

[0163] In the present embodiment, the cell monomer 3 is a primary battery or a secondary battery, and / or the cell monomer 3 does not have a pole; it should be noted that the primary battery refers to a disposable battery that cannot be charged, and the secondary battery refers to a battery that can be charged, and the pole here refers to not having the traditional "pole" structure, such as 18650 lithium battery, button cell, etc. These single-section batteries do not have the traditional "pole" structure, but are connected to the external circuit through the end face (also known as the electrode).

[0164] Referring to FIG. 26, in the present embodiment, the battery pack further comprises a first circuit board 14 and a battery terminal assembly 17 of a metal material, the first circuit board 14 comprises a metal conductive layer; the metal activity of the battery terminal assembly 17 and the metal conductive layer is less than the metal activity of the metal sacrificial part 29; the battery terminal assembly 17 is electrically connected with the first circuit board 14, and at least part of the electrical connecting part 26 is electrically connected with the first circuit board 14.

[0165] It should be noted that the metal material activity of the battery terminal assembly 17 is less than the activity of the metal sacrificial part 29, so that the corrosion protection of the battery terminal assembly 17 is also within the protection; by the setting of the battery terminal assembly 17, the charging and discharging of the battery pack is facilitated. The first circuit board 14 generally comprises an insulating substrate, a metal conductive layer, a soldering element, a surface treatment layer and an interface; the insulating substrate is usually made of glass fiber reinforced epoxy resin or other materials, used to support and protect the circuit; the metal conductive layer is mainly copper foil, which forms a circuit pattern through etching process; the soldering element such as solder pad is used to connect electronic components; the surface treatment layer such as solder mask, silk screen layer, etc. is used to protect the circuit and provide identification; the interface such as gold finger, connector, etc. is used to connect with external devices. The metal activity of the metal conductive layer is less than the metal activity of the metal sacrificial part 29, so that the main structure of the first circuit board 14 is also within the corrosion protection range.

[0166] Referring to FIGS. 24-28, in the present embodiment, the electrical connecting part 26 comprises a main body part 261, and an elastic part 262 for electrically connecting with the electrode of the battery cell monomer 3 is integrally formed on the main body part 261; the second battery cell support 27 is provided with a through hole 2721 for exposing the electrode of the battery cell monomer 3, and the elastic part 262 protrudes into the through hole 2721 and is positioned with the through hole 2721.

[0167] It should be noted that the design of the elastic part 262 enables it to adapt to the slight displacement of the electrode of the battery cell monomer 3, ensuring good contact under conditions such as vibration or temperature change, and reducing contact resistance. The elastic part 262 protrudes into the through hole 2721 and is positioned with the through hole 2721, which can prevent the electrical connecting part 26 from being detached due to external force during use, thereby enhancing the stability of the connection. The elastic part 262 not only provides electrical connection, but also provides additional structural support for the main body part 261, reducing the movement of the main body part 261 after being stressed, thereby improving the structural stability of the main body part 261. Due to the existence of the elastic part 262, even when subjected to a certain degree of impact or vibration, the stable connection between the electrical connecting part 26 and the battery cell monomer 3 can be maintained, thereby enhancing the impact resistance of the battery. The design of the elastic part 262 enables the electrical connecting part 26 to be easily installed into the second battery cell support 27 without the need for complex alignment and fixing steps, greatly simplifying the assembly process.

[0168] Please refer to Figure 28, in this embodiment, the second cell support 27 is also provided with a limiting part 273, the limiting part 273 is used for limiting the main body part 261, so as to facilitate the fixation of the main body part 261.

[0169] Please refer to Figure 27, in this embodiment, the bending part of the main body part 261 is also provided with a reinforcing rib 265.

[0170] Please refer to Figure 27, in this embodiment, the electric connecting part 26 further comprises a second extension part 263 which is integrally formed and electrically connected with the first circuit board 14; the second cell support 27 is provided with a limiting structure 271 which limits the second extension part 263.

[0171] Please refer to Figure 27, in this embodiment, the limiting structure 271 is provided with a plurality of limiting structures, at least part of the limiting structure 271 protrudes from the second cell support 27 to the first circuit board 14 and supports the first circuit board 14, so that there is at least a gap between the side of the second cell support 27 facing the first circuit board 14 and the first circuit board 14.

[0172] It should be noted that the second extension part 263 on the main body part 261 is electrically connected with the first circuit board 14, so as to facilitate the first circuit board 14 to detect the voltage of each cell monomer 3 through the electric connecting part 26, by monitoring the voltage of each cell monomer 3, it can ensure that all cell monomers 3 are uniformly charged and discharged, avoid overcharging or overdischarging of some cell monomers 3, thereby prolonging the service life of the battery. Through the guiding and limiting of the limiting structure 271, the connection stability of the second extension part 263 and the first circuit board 14 can be ensured; the main body part 261 comprises a positioning part 2611 for positioning connection with the second cell support 27; the positioning part 2611 is arranged to accurately fix the main body part 261 on the second cell support 27, and reduce the loosening of the connection caused by vibration or other external forces during use, thereby maintaining the stability of the electrical connection; the design of the limiting structure 271 can effectively limit the movement of the main body part 261, enhance the stability of the electric connecting part 26 in the vibrating environment, and reduce the failure caused by vibration. At the same time, by arranging the limiting structure 271 on the second cell support 27 and protruding and supporting the first circuit board 14 towards the first circuit board 14, at least part of the region of the first circuit board 14 can be in a suspended state, on the one hand, a certain heat dissipation gap can be formed between the first circuit board 14 and the second cell support 27, which is helpful for air circulation, thereby improving the heat dissipation performance of the whole battery system, and good heat dissipation can prolong the service life of the battery and improve its working efficiency. On the other hand, it can prevent the first circuit board 14 from directly contacting the second cell support 27 in a large area, thereby reducing the risk of damage to the first circuit board 14 caused by friction or vibration.

[0173] Please refer to FIG. 29, in the embodiment, the battery pack further comprises a battery shell 1, the battery shell 1 comprises a cavity, the battery cell monomer 3, the electrical connecting piece 26, the metal sacrificial piece 29 and / or the second battery cell support 27 are all accommodated in the cavity, the second heat dissipation hole 101 is further arranged on the battery shell 1, the battery shell 1 is provided with an opening, and the battery terminal assembly 17 is exposed to the opening. By the arrangement of the battery shell 1, the protection of the internal structure of the whole battery pack is realized, and the service life is improved.

[0174] Please refer to FIG. 26 and FIG. 29, in the embodiment, the second heat dissipation channel 2761 is arranged on the side support 276, one end of the second heat dissipation channel 2761 passes through the first circuit board 14 and communicates with the second heat dissipation hole 101, and the other end passes to the battery cell monomer 3, so as to facilitate the rapid heat dissipation of the battery cell monomer 3, and the second heat dissipation channel 2761 is limitingly arranged with the first circuit board 14.

[0175] Please refer to FIG. 28, in the embodiment, the second battery cell support 27 comprises a third support 274, a fourth support 275 and a side support 276; the third support 274 and the fourth support 275 both comprise a limiting groove 272 for limiting the battery cell monomer 3, and a through hole 2721 is arranged at the limiting groove 272; the third support 274 and / or the fourth support 275 are detachably connected with the side support 276.

[0176] It should be noted that the third support 274 and the fourth support 275 both comprise a limiting groove 272 for limiting the battery cell monomer 3, when the third support 274, the fourth support 275 and the side support 276 are installed to form the second battery cell support 27, the limiting grooves 272 of the third support 274 and the fourth support 275 are arranged in alignment, which helps to ensure that the battery cell monomer 3 can be accurately positioned during installation, and reduces the risk of poor contact or short circuit caused by position deviation. The third support 274 and the fourth support 275 are detachably connected by the side support 276, which can form a stable overall structure, thereby improving the stability of the whole second battery cell support 27. The side support 276 is not only used for connecting the third support 274 and the fourth support 275, but also serves as a base for installing the first circuit board 14, that is, the side support 276 is provided with a structure for positioning and installing the first circuit board 14, and at the same time, the side support 276 is also used for installing the battery terminal assembly 17 and the clamping and limiting assembly 28, therefore, the side support 276 has multiple functions.

[0177] Please refer to FIG. 26, FIG. 29, in the embodiment, the battery pack further comprises a clamping limiting assembly 28, the clamping limiting assembly 28 comprises a second elastic member 281 and a clamping button, the clamping button comprises a second pressing portion 282 and a limiting member 283 for clamping and limiting with the tool body to be installed; the clamping button is movably limited in the battery shell 1, and the second pressing portion 282 and the limiting member 283 are exposed outside the battery shell 1, and the second elastic member 281 is arranged between the second battery cell support 27 and the clamping button and supports the limiting member 283 to protrude outside the battery shell 1.

[0178] It should be noted that the battery shell 1 is provided with a hole for exposing the second pressing portion 282 and the limiting member 283, and the limiting member 283 protrudes outside the battery shell 1 under the elastic force of the second elastic member 281 such as a spring, and when the battery pack is installed with the tool body, the limiting member 283 is limited with the tool body, thereby avoiding or reducing the looseness between the battery pack and the tool body, so as to ensure that the battery pack can stably supply power for the tool body.

[0179] Please refer to FIG. 29, in the embodiment, the battery shell 1 is provided with an opening for exposing the battery terminal assembly 17, and a guide portion for installing with the tool body is arranged at the opening, thereby facilitating the smooth fitting and installation of the battery pack and the tool body.

[0180] It should be noted that the battery cell monomer 3 is a square battery or a cylindrical battery, and the specific shape is not limited. The battery cell monomer 3 at least comprises a metal shell, a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the negative electrode is generally connected with the metal shell. In addition, it can also comprise a safety valve, an air hole, an insulating plate and the like. The metal shell is not only a protective cover for the battery cell monomer 3, but also provides firm protection for the internal core components to prevent external physical impact from damaging the battery. Moreover, the metal shell plays a role in moisture-proof and dust-proof to a certain extent. More importantly, the metal shell as the negative electrode of the battery cell monomer 3 participates in the charging and discharging process of the battery together with the positive electrode. For example, the model of the lithium battery is 18650 and 21700.

[0181] It can be understood that the principle of delaying the internal corrosion of the battery pack by using the metal sacrificial member 29 can also be applied to the battery packs of the above-mentioned embodiments 1-3.

[0182] Embodiment 6

[0183] In order to solve the problem that after the battery pack is matched with the electric tool, the electric tool will vibrate during use, the tool terminal assembly of the electric tool and the battery terminal assembly of the battery pack will be in poor contact due to vibration, the terminal part will be blackened by sparking or even in a molten state, sparking between the terminals will damage the control panel of the electric tool or the battery pack, and finally the electric tool cannot be used. The embodiment provides an electric tool as shown in FIG. 30, which comprises a tool body 300, a battery pack 100 and a magnetic attraction assembly which are matched with each other.

[0184] Please refer to FIG. 30-35, the tool body 300 includes a tool housing 301, a battery mounting portion 303 and a tool terminal assembly 3051; the battery mounting portion 303 is arranged on the tool housing 301, and the tool terminal assembly 3051 is arranged on the battery mounting portion 303. The battery pack 100 includes a battery housing, a battery combination portion 210 and a battery terminal assembly 260; the battery combination portion 210 is arranged on the battery housing, and the battery terminal assembly 260 is arranged on the battery combination portion 210, and the battery pack 100 is mounted on the battery mounting portion 303 of the tool body 300 through the battery combination portion 210; a magnetic attraction assembly includes a second magnetic attraction component 306 and a first magnetic attraction component 250 matched with each other, the second magnetic attraction component 306 is arranged on the battery mounting portion 303, and the first magnetic attraction component 250 is arranged on the battery combination portion 210; the magnetic attraction assembly is configured to reduce the vibration frequency and / or gap between the tool terminal assembly 3051 and the battery terminal assembly 260 by the attraction force between the second magnetic attraction component 306 and the first magnetic attraction component 250 when the power tool is working.

[0185] By arranging the magnetic attraction assembly at the matching position of the tool body 300 and the battery pack 100, the fixing and shockproof effects can be achieved by the attraction force between the two magnetic attraction components when the power tool is working, so as to reduce the vibration frequency and / or gap between the tool terminal assembly 3051 and the battery terminal assembly 260, thereby reducing the probability of poor contact between the tool terminal assembly 3051 and the battery terminal assembly 260, avoiding the sparking between the tool terminal assembly 3051 and the battery terminal assembly 260, and prolonging the service life of the whole machine.

[0186] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings.

[0187] Please refer to FIG. 30-35, the power tool is a handheld power tool, which includes a tool body 300 and a battery pack 100 matched with each other, and the tool body 300 and the battery pack 100 are detachably connected.

[0188] Please refer to FIG. 30-33, the power tool includes a tool housing 301, a holding portion 302, a battery mounting portion 303 and a tool terminal assembly 3051. The tool housing 301 is used for mounting the functional modules of the power tool; the holding portion 302 is arranged on one side of the tool housing 301 and is used for being held by a person, and a control switch 14 is arranged on the holding portion 302; the battery mounting portion 303 is arranged on the end of the holding portion 302 away from the tool housing 301, and is used for mounting the battery pack 100; and the tool terminal assembly 3051 is arranged on the battery mounting portion 303. The tool housing 301, the holding portion 302 and the battery mounting portion 303 can be integrally formed or separately formed and then assembled together.

[0189] It can be understood that the battery mounting portion 303 can also not be connected with the holding portion 302, but is directly arranged on the tool housing 301.

[0190] It can be understood that in some non-handheld power tools, the holding portion 302 can also not be arranged, and the battery mounting portion 303 is directly arranged on the tool housing 301.

[0191] Please refer to FIG. 34 and FIG. 35, the battery pack 100 includes a battery housing, a battery combination portion 210 and a battery terminal assembly 260. The battery housing includes a third housing 220 and a fourth housing 230, the third housing 220 and the fourth housing 230 are fixedly connected, and the third housing 220 and the fourth housing 230 are assembled to form a receiving cavity, the cell assembly and the first circuit board of the battery pack 100 are received in the receiving cavity, and the battery combination portion 210 is arranged on the top surface of the third housing 220.

[0192] The battery combination portion 210 of the battery pack 100 is inserted into the battery pack slot 3031 of the battery mounting portion 303 from one end of the socket of the battery mounting portion 303, and is limited by the limiting piece 283 arranged on the top surface of the third housing 220 of the battery pack 100 and the limiting groove 3034 arranged on the front end bottom surface of the battery pack slot 3031, to prevent the battery combination portion 210 and the battery mounting portion 303 from sliding along the insertion direction. At the same time, the battery mounting portion 303 is arranged to at least partially include the battery combination portion 210, thereby preventing the battery combination portion 210 from being detached from the battery mounting portion 303 from a position other than the socket of the battery mounting portion 303, to ensure the stability of the battery pack 100.

[0193] Of course, the battery combination portion 210 can also be arranged on the bottom or side wall of the battery pack 100 housing, and can be adaptively adjusted according to the assembly mode of the battery pack 100 and the tool main body 300.

[0194] Please refer to FIG. 30-FIG. 35, the magnetic attraction assembly includes a second magnetic attraction component 306 and a first magnetic attraction component 250 which cooperate with each other, the second magnetic attraction component 306 is arranged on the battery mounting portion 303, and the first magnetic attraction component 250 is arranged on the battery combination portion 210. One of the second magnetic attraction component 306 and the first magnetic attraction component 250 is a permanent magnet, and the other is a permanent magnet or a metal piece which can be attracted by a permanent magnet, wherein the permanent magnet can be, for example, a neodymium iron boron magnet, a ferrite magnet, an alnico magnet, a samarium cobalt magnet, an iron-chromium-cobalt magnet, etc., and the material of the magnetic attraction metal piece can be, for example, iron, cobalt, nickel, manganese or a combination thereof.

[0195] When the battery pack 100 is assembled on the tool body 300, the attraction force between the second magnetic attraction component 306 and the first magnetic attraction component 250 plays a fixing and shockproof effect to reduce the vibration frequency and / or gap between the tool terminal assembly 3051 and the battery terminal assembly 260 during the operation of the power tool, thereby reducing the probability of poor contact between the tool terminal assembly 3051 and the battery terminal assembly 260, avoiding the situation of sparking between the tool terminal assembly 3051 and the battery terminal assembly 260, and prolonging the service life of the whole machine.

[0196] It should be noted that in order to meet the stronger attraction force between the second magnetic attraction component 306 and the first magnetic attraction component 250, the gap between the second magnetic attraction component 306 and the first magnetic attraction component 250 needs to be as small as possible. As an example, the distance between the second magnetic attraction component 306 and the first magnetic attraction component 250 is less than or equal to 1 mm, such as 0 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm.

[0197] Please refer to FIGS. 30-35, in order to better achieve the reduction of the vibration frequency and / or gap between the tool terminal assembly 3051 and the battery terminal assembly 260 during the operation of the power tool, the second magnetic attraction component 306 can be arranged at the position of the battery mounting portion 303 close to the tool terminal assembly 3051, and the first magnetic attraction component 250 can be arranged at the position of the battery combination portion 210 close to the tool terminal assembly 3051, so that the position of the attraction force between the second magnetic attraction component 306 and the first magnetic attraction component 250 is closer to the tool terminal assembly 3051 and the battery terminal assembly 260, further reducing the probability of poor contact between the tool terminal assembly 3051 and the battery terminal assembly 260, avoiding the situation of sparking between the tool terminal assembly 3051 and the battery terminal assembly 260, and prolonging the service life of the whole machine.

[0198] Please refer to FIGS. 30-32, in a specific embodiment, the battery mounting portion 303 is provided with a battery pack slot 3031 and a pair of guide rails 3033. The pair of guide rails 3033 are arranged on the two side walls of the battery pack slot 3031, and the tool terminal assembly 3051 is arranged at the rear end of the battery pack slot 3031 and located between the pair of guide rails 3033. The second magnetic attraction component 306 is selected from a permanent magnet, and the second magnetic attraction component 306 can be arranged at one end of the guide rail 3033 close to the tool terminal assembly 3051 according to the position of the first magnetic attraction component 250, for example, the first magnetic attraction component mounting portion 3033a or 3033b in the dashed circle in FIG. 32, wherein the first magnetic attraction component mounting portion 3033a is located at the side of the guide rail 3033, and the first magnetic attraction component mounting portion 3033b is located at the end of the guide rail 3033.

[0199] Please refer to FIG. 34 and FIG. 35, the two sides of the battery combination part 210 are provided with slide rails 211 which are in sliding cooperation with the guide rails 3033, and the battery terminal assembly 260 is arranged at the insertion end 212 of the battery combination part 210. The first magnetic attraction part 250, for example, can be a long strip-shaped metal piece which can be attracted by a permanent magnet, and is embedded in the slide rail 211 at the end close to the battery terminal assembly 260 in parallel to the insertion direction (i.e. the front-rear direction in FIG. 30), so that when the battery pack 100 is assembled on the tool body 300, the metal piece can interact with the permanent magnet arranged at the position of the first magnetic attraction part mounting part 3033a or the first magnetic attraction part mounting part 3033b to generate an attractive force to achieve the effects of fixation and shock absorption, so as to reduce the vibration frequency and / or gap between the tool terminal assembly 3051 and the battery terminal assembly 260 during the operation of the power tool, thereby reducing the probability of poor contact between the tool terminal assembly 3051 and the battery terminal assembly 260, avoiding the situation of sparking between the tool terminal assembly 3051 and the battery terminal assembly 260, and prolonging the service life of the whole machine. Of course, the second magnetic attraction part 306 can also be a metal piece, and the first magnetic attraction part 250 can be a permanent magnet.

[0200] Please refer to FIG. 34 and FIG. 35, the slide rail 211 is also provided with an opening which exposes at least part of the second magnetic attraction part 306, i.e. the second magnetic attraction part 306 can expose part or all of the second magnetic attraction part 306. The opening not only can increase the attractive force of the second magnetic attraction part 306 and the first magnetic attraction part 250, but also can serve as a positioning hole for the battery shell and the battery combination part 210 during injection molding to achieve the positioning effect. The opening includes a plurality of first openings 214 which are arranged at the side wall of the slide rail 211 in the insertion direction, and a second opening 215 which is arranged at the end of the slide rail 211 close to the insertion end 212. The first opening 214 exposes part of the side wall of the metal piece, and the second opening 215 exposes the end of the metal piece.

[0201] Please refer to FIG. 30-35, the tool body 300 further comprises a terminal seat 305, which is installed in the terminal seat installation part 3032 at the rear end of the battery pack slot 3031, and the tool terminal assembly 3051 is fixedly installed on the terminal seat 305. For this purpose, the second magnetic attraction part 306 can also be arranged on the side of the terminal seat 305 away from the tool terminal assembly 3051; the first magnetic attraction part 250 is arranged on the corresponding position of the insertion end 212 of the battery combination part 210, and the second magnetic attraction part 306 and the first magnetic attraction part 250 can also generate an attractive force when the battery pack 100 is assembled on the tool body 300, thereby achieving the functions of fixation and shock absorption, reducing the vibration frequency and / or gap between the tool terminal assembly 3051 and the battery terminal assembly 260 during the operation of the power tool, thereby reducing the probability of poor contact between the tool terminal assembly 3051 and the battery terminal assembly 260, avoiding the situation of sparking between the tool terminal assembly 3051 and the battery terminal assembly 260, and prolonging the service life of the whole machine.

[0202] Specifically, please refer to FIG. 30-35, the side of the terminal seat 305 away from the tool terminal assembly 3051 is provided with a second magnetic attraction part installation part 3052a, 3052b in the shape of a groove, the second magnetic attraction part installation part 3052a is arranged in the middle, and the second magnetic attraction part installation part 3052b comprises two parts, which are arranged on both sides of the second magnetic attraction part installation part 3052a. Correspondingly, the insertion end 212 of the battery combination part 210 can also be provided with a third magnetic attraction part installation part 212a, 212b corresponding to the positions of the second magnetic attraction part installation part 3052a, 3052b, the third magnetic attraction part installation part 212a is arranged in the middle of the insertion end 212, and the third magnetic attraction part installation part 212b comprises two parts, which are arranged on both sides of the third magnetic attraction part installation part 212a. When the second magnetic attraction part 306 is arranged in the second magnetic attraction part installation part 3052a or 3052b, the first magnetic attraction part 250 can be arranged in the third magnetic attraction part installation part 212a or 212b of the insertion end 212 of the battery combination part 210; when the second magnetic attraction part 306 is arranged in the second magnetic attraction part installation part 3052a and 3052b at the same time, the first magnetic attraction part 250 can also be arranged in the third magnetic attraction part installation part 212a and 212b at the same time.

[0203] The embodiment also discloses another electric tool as shown in FIG. 36, which is different from the electric tools shown in FIGS. 30-35 in that one of the second magnetic attraction component 306 and the first magnetic attraction component 250 is an electromagnet, and the other is a permanent magnet, an electromagnet or a metal piece capable of being attracted by the electromagnet, and the other structures are the same, and thus will not be repeated. In FIG. 36, the second magnetic attraction component 306 is an electromagnet, which is electrically connected with the battery pack 100 through the second circuit board 307 of the tool body 300. The second circuit board 307 is provided with a magnet power supply circuit for supplying power to the electromagnet, and the magnet power supply circuit can supply power to the electromagnet by using the output of the battery pack 100.

[0204] The tool body 300 can control the circuit on-off of the magnet power supply circuit and the electromagnet through the operation switch 304 on the tool body 300, that is, the operation switch 304 can be used as the start-stop switch of the electric tool and the control switch of the electromagnet, and the electric tool and the electromagnet can be started and stopped synchronously through the operation switch 304, so that the electromagnet can be in the power-on state when the electric tool works, and in the power-off state at other times, so that the disassembly of the battery pack 100 will not be affected.

[0205] The operation switch 304 includes but is not limited to a trigger, a knob, a sliding mechanism and the like. In FIG. 36, the operation switch 304 is a trigger, which is arranged on the holding part 302. The trigger has two functions, one of which is to control the start and stop of the electric tool as the start-stop switch of the electric tool, and the other of which is to supply power to the electromagnet or cut off the power supply as the control switch of the electromagnet.

[0206] It should be noted that the current of the electromagnet can also be automatically or manually adjusted according to the working gear of the electric tool, so as to adjust the magnetic field strength of the electromagnet and change the magnetic attraction force between the magnetic attraction assemblies. For example, when the electric tool works at a high gear, the vibration is more intense, and at this time, the current of the electromagnet can be increased to increase the magnetic field strength of the electromagnet, so as to increase the magnetic attraction force between the magnetic attraction assemblies; when the electric tool works at a low gear, the vibration is relatively weak, and at this time, the current of the electromagnet can be appropriately reduced to weaken the magnetic field strength of the electromagnet, so as to reduce the magnetic attraction force between the magnetic attraction assemblies, thereby saving electric energy.

[0207] Of course, in other embodiments, the control of the power supply circuit of the control magnet and the on-off of the circuit of the electromagnet can also be controlled by a separately arranged switch. Furthermore, the switch can also be set in stages to adjust the magnetic field strength of the electromagnet, thereby changing the magnetic attraction force between the magnetic attraction assemblies. For example, when the power tool works at a high gear, the vibration is more intense, at this time, the current of the electromagnet can be increased to increase the magnetic field strength of the electromagnet, thereby increasing the magnetic attraction force between the magnetic attraction assemblies; while when the power tool works at a low gear, the vibration is relatively weak, at this time, the current of the electromagnet can be appropriately reduced to weaken the magnetic field strength of the electromagnet, thereby reducing the magnetic attraction force between the magnetic attraction assemblies to save electric energy.

[0208] It can be understood that the embodiments can also be applied to the battery pack and the tool body of embodiments 1-3 and 5 by setting the magnetic attraction assemblies at the matching position of the tool body and the battery pack 100, so that the fixing and shockproof effect can be achieved by the attraction force between the two magnetic attraction assemblies when the power tool works, to reduce the vibration frequency and / or the gap between the tool terminal assembly and the battery terminal assembly 17.

[0209] The above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a battery housing having a first accommodating space; a battery pack frame arranged in the first accommodating space, the battery pack frame having a second accommodating space; a battery pack; and a first circuit board mounted on one side of the battery pack and electrically connected with the battery pack, and the battery pack and the first circuit board are packaged in the second accommodating space. The battery pack comprises a plurality of soft-pack battery cells arranged in a first direction.

2. The battery pack of claim 1, wherein, The first circuit board is arranged in a second direction of the plurality of soft-pack battery cells, and the second direction is perpendicular to the first direction.

3. The battery pack of claim 2, wherein, The battery pack further comprises a lamp plate mounted on an upper end of the battery pack frame and arranged in the first direction of the plurality of soft-pack battery cells, and the lamp plate is electrically connected with the first circuit board.

4. The battery pack of claim 2, wherein, The battery housing comprises a first housing and a second housing, and the second housing forms the first accommodating space with the first housing.

5. The battery pack of claim 4, wherein, The first housing is provided with a first opening opposite to a lamp bead area of the lamp plate, and a transparent lampshade is arranged on a side of the first housing away from the lamp plate, and the transparent lampshade seals the first opening.

6. The battery pack of claim 5, wherein, The first housing is provided with a second opening opposite to a touch area of the lamp plate, and a button is arranged in the second opening and in contact with the touch area of the lamp plate.

7. The battery pack of claim 5, wherein, The battery pack further comprises a battery terminal assembly and a conductive strip assembly, the battery terminal assembly and the conductive strip assembly are mounted on a lower end of the battery pack frame and arranged in the first direction of the plurality of soft-pack battery cells, and the battery terminal assembly is electrically connected with the first circuit board through the conductive strip assembly.

8. The battery pack of claim 2, wherein, The battery pack further comprises a waterproof pad arranged between the battery terminal assembly and the battery pack frame, and a heat insulation sheet arranged between the waterproof pad and the battery pack frame.

9. The battery pack of claim 8, wherein, The conductive strip assembly comprises a plurality of conductive strips, the battery terminal assembly comprises a plurality of connection terminals, and the connection terminals are connected with a plurality of ports of the first circuit board through the conductive strips.

10. The battery pack of claim 8, wherein, The battery terminal assembly comprises a plurality of positive output terminals, a plurality of charging terminals, a plurality of communication terminals and a plurality of negative output terminals arranged at intervals, the center distance between the positive output terminals and the negative output terminals is between 34mm and 38mm, and the center distance between the communication terminals and the charging terminals is between 10mm and 14mm.

11. The battery pack of claim 8, wherein, The battery pack frame comprises a nylon frame or a PVC frame with an opening on one side, and the opening is arranged in the second direction of the battery pack frame.

12. The battery pack of claim 2, wherein, The energy density of the battery pack is greater than or equal to 169Wh / kg and less than or equal to 250Wh / kg.

13. The battery pack of claim 1, wherein, The energy density of the battery pack is greater than or equal to 170 Wh / cm 3 and less than or equal to 290 Wh / cm 3 .

14. The battery pack of claim 1, wherein, The battery pack further comprises a battery combining part, a battery terminal assembly and a first magnetic attraction part, the battery combining part is arranged in the battery housing, the battery terminal assembly is arranged in the battery combining part, and the first magnetic attraction part is arranged in the battery combining part, and the battery pack can be assembled in a battery mounting part of a tool main body through the battery combining part; 15. The battery pack of claim 1, wherein, wherein the battery mounting part is provided with a tool terminal assembly and a second magnetic attraction part. ​ When the battery pack is mounted on the battery mounting portion of the tool body through the battery joint portion, the vibration frequency and / or the gap between the tool terminal assembly and the battery terminal assembly are reduced by the attraction force between the first magnetic attraction component and the second magnetic attraction component during the operation of the tool.

16. The battery pack of claim 15, wherein, One of the first magnetic attraction component and the second magnetic attraction component is a permanent magnet, and the other is a permanent magnet or a metal piece that can be attracted by a permanent magnet; or One of the first magnetic attraction component and the second magnetic attraction component is an electromagnet, and the other is a permanent magnet, an electromagnet, or a metal piece that can be attracted by an electromagnet.

17. The battery pack of claim 15, wherein, The first magnetic attraction component is arranged at a position close to the battery terminal assembly of the battery joint portion, and the second magnetic attraction component is arranged at a position close to the tool terminal assembly of the battery mounting portion.

18. The battery pack of claim 15, wherein, The distance between the first magnetic attraction component and the second magnetic attraction component is less than or equal to 1 mm.

19. The battery pack of claim 1, wherein, The battery pack further comprises a metal sacrificial piece, which is electrically connected to the electrical connector of the battery pack, and the metal activity of the metal sacrificial piece is greater than that of the electrical connector.

20. A power tool, characterized by The tool and the battery pack are included; The battery pack comprises: a battery housing having a first accommodating space; a battery pack frame arranged in the first accommodating space, the battery pack frame having a second accommodating space; a battery pack; and a first circuit board electrically connected to one side of the battery pack and arranged in the second accommodating space.

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