CN111816819B - Battery pack, tool system and charging system - Google Patents

Abstract

The invention provides a battery pack, a tool system and a charging system. The battery pack comprises a shell, a battery pack accommodated in the shell and a conversion assembly electrically connected with the battery pack, wherein the conversion assembly comprises a connection assembly electrically connected with the battery pack and a sliding assembly electrically connected with the connection assembly, the sliding assembly is arranged in a sliding manner relative to the connection assembly, and when the sliding assembly is positioned at a first position, the battery pack outputs a first voltage value; when the sliding component slides to a second position, the battery pack outputs a second voltage value; when the sliding assembly slides to a third position, the battery pack outputs a third voltage value; the first voltage value is greater than the second voltage value, which is greater than the third voltage value. Compared with the prior art, the battery pack realizes the serial-parallel state switching of each battery core module in the battery pack by controlling the sliding position of the sliding component, thereby realizing the change of the output voltage of the battery pack and improving the suitability of a tool system with the battery pack.

Description

Battery Packs, Tool Systems and Charging Systems

Technical Field

The present invention relates to the technical field of battery packs, and in particular to a battery pack, a tool system and a charging system.

Background Art

In the garden machinery and power tool industries, tools with different rated voltages usually need to be powered by battery packs with different rated voltages, which results in an increase in the types of battery packs and an increase in costs.

In view of this, it is indeed necessary to design an improved battery pack, tool system and charging system to solve the above problems.

Summary of the invention

The object of the present invention is to provide a battery pack, a tool system and a charging system that can achieve quick switching and three voltage outputs.

To achieve the above-mentioned object, the present invention provides a battery pack, comprising a shell, a battery pack accommodated in the shell, and a conversion component electrically connected to the battery pack, the battery pack at least comprising a first battery cell module, a second battery cell module, a third battery cell module and a fourth battery cell module, the conversion component comprising a connecting component electrically connected to the battery pack and a sliding component electrically connected to the connecting component, the sliding component being slidably arranged relative to the connecting component, and when the sliding component is located at a first position, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in series, and the battery pack outputs a first voltage value; when the sliding component slides to a second position, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in series and parallel, and the battery pack outputs a second voltage value; when the sliding component slides to a third position, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in parallel, and the battery pack outputs a third voltage value; the first voltage value is greater than the second voltage value, and the second voltage value is greater than the third voltage value.

As a further improvement of the present invention, the connecting component includes a connecting body and a connecting terminal formed on the connecting body, and the sliding component includes a sliding body and a first contact terminal, a second contact terminal and a third contact terminal formed on the sliding body and spaced apart from each other. When the sliding component is in a first position, the connecting terminal is electrically connected to the first contact terminal. When the sliding component slides to a second position, the connecting terminal is electrically connected to the second contact terminal. When the sliding component slides to a third position, the connecting terminal is electrically connected to the third contact terminal.

As a further improvement of the present invention, the first contact terminal includes a first connecting piece connecting the positive electrode of the second battery cell module with the negative electrode of the first battery cell module, a second connecting piece connecting the positive electrode of the third battery cell module with the negative electrode of the second battery cell module, and a third connecting piece connecting the positive electrode of the fourth battery cell module with the negative electrode of the third battery cell module, so as to realize the mutual series connection of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

As a further improvement of the present invention, the second contact terminal includes a first positive electrode connecting plate connecting the positive electrode of the first battery cell module with the positive electrode of the second battery cell module, a fourth connecting plate respectively connected to the positive electrode of the third battery cell module, the positive electrode of the fourth battery cell module, the negative electrode of the first battery cell module and the negative electrode of the second battery cell module, and a first negative electrode connecting plate connecting the negative electrode of the third battery cell module with the negative electrode of the fourth battery cell module.

As a further improvement of the present invention, the third contact terminal includes a second positive electrode connecting plate and a second negative electrode connecting plate, the second positive electrode connecting plate is respectively connected to the positive electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and the second negative electrode connecting plate is respectively connected to the negative electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

As a further improvement of the present invention, the sliding body includes a first body, a second body and a third body which are parallel to each other and spaced apart, the first contact terminal is formed and exposed on the first body, the second contact terminal is formed and exposed on the second body, and the third contact terminal is formed and exposed on the third body; the sliding body also includes a sliding rod arranged perpendicular to the second body and a sliding portion located at the end of the sliding rod, the sliding rod protrudes beyond the outer surface of the shell so that the sliding portion is exposed outside the shell, and the sliding portion is used to push the sliding body to switch between the first position, the second position and the third position.

As a further improvement of the present invention, the sliding body also includes a connecting column connecting the first body, the second body and the third body in the width direction thereof and an elastic member sleeved on the connecting column, one end of the elastic member is fixed to the first body, and the other end is in contact with and fixed to the connecting body, and when the sliding body is in the second position or the third position, the elastic member is elastically compressed.

As a further improvement of the present invention, the shell is provided with a slide groove and limit blocks located on both sides of the slide groove, the sliding part slides along the slide groove to switch between the first position, the second position and the third position, and the limit blocks are used to limit and fix the sliding part in the first position, the second position or the third position.

As a further improvement of the present invention, the sliding part includes a base sliding along the slide groove and a limiting part protruding outward from both sides of the base, so that the sliding part is roughly cross-shaped; two limiting blocks are respectively arranged on both sides of the slide groove, and a limited space is formed between the two limiting blocks, and when the sliding part is in the first position or the third position, the outer wall surface of the limiting part abuts against the outer wall surface of the corresponding limiting block; when the sliding part is in the second position, the limiting part is accommodated in the limiting space.

As a further improvement of the present invention, a receiving cavity is provided in the connecting body, the sliding assembly is received in the receiving cavity and is electrically connected to the connecting terminal, the connecting terminal includes a first positive terminal and a first negative terminal, four first positive terminals are provided to electrically connect to the positive poles of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, respectively, and four first negative terminals are also provided to electrically connect to the negative poles of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, respectively.

As a further improvement of the present invention, one end of the connecting terminal is accommodated and exposed in the accommodating cavity, and the other end is located outside the connecting body. The connecting terminal also includes a second positive terminal and a second negative terminal located outside the connecting body. The second positive terminal is formed on the first positive terminal corresponding to the positive pole of the first battery cell module to serve as a total positive output terminal; the second negative terminal is formed on the first negative terminal corresponding to the negative pole of the fourth battery cell module to serve as a total negative output terminal.

To achieve the above object, the present invention provides a tool system, comprising:

A battery pack, the battery pack comprising a housing, a battery pack contained in the housing, and a conversion assembly electrically connected to the battery pack, the conversion assembly comprising a connecting assembly electrically connected to the battery pack and a sliding assembly electrically connected to the connecting assembly, the sliding assembly being slidably arranged relative to the connecting assembly;

a first electric tool, the first electric tool being capable of operating at a first rated voltage, the first electric tool being provided with a first external plug socket;

a second electric tool capable of operating at a second rated voltage, the second electric tool being provided with a second external plug socket;

a third electric tool, the third electric tool being capable of operating at a third rated voltage and being provided with a third external plug socket;

When the battery pack is connected to the first external plug-in socket of the first electric tool, the sliding assembly is located at the first position, and the battery pack outputs a first voltage value;

When the battery pack is connected to the second external plug-in socket of the second electric tool, the sliding assembly slides to the second position, and the battery pack outputs a second voltage value;

When the battery pack is connected to the third external plug socket of the third electric tool, the sliding assembly slides to a third position, and the battery pack outputs a third voltage value; the first voltage value is greater than the second voltage value, and the second voltage value is greater than the third voltage value.

As a further improvement of the present invention, the first voltage value is "4n"V, the second voltage value is "2n"V, and the third voltage value is "n"V.

As a further improvement of the present invention, the battery pack includes at least a first battery cell module, a second battery cell module, a third battery cell module and a fourth battery cell module, the connecting component includes a connecting body and a connecting terminal formed on the connecting body, the sliding component includes a sliding body and a first contact terminal, a second contact terminal and a third contact terminal formed on the sliding body and spaced apart from each other, when the sliding component is located at a first position, the connecting terminal is electrically connected to the first contact terminal, and the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in series; when the sliding component slides to a second position, the connecting terminal is electrically connected to the second contact terminal, and the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in series and in parallel; when the sliding component slides to a third position, the connecting terminal is electrically connected to the third contact terminal, and the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in parallel.

As a further improvement of the present invention, the first contact terminal includes a first connecting piece connecting the positive electrode of the second battery cell module with the negative electrode of the first battery cell module, a second connecting piece connecting the positive electrode of the third battery cell module with the negative electrode of the second battery cell module, and a third connecting piece connecting the positive electrode of the fourth battery cell module with the negative electrode of the third battery cell module, so as to realize the mutual series connection of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

As a further improvement of the present invention, the second contact terminal includes a first positive electrode connecting plate connecting the positive electrode of the first battery cell module with the positive electrode of the second battery cell module, a fourth connecting plate respectively connected to the positive electrode of the third battery cell module, the positive electrode of the fourth battery cell module, the negative electrode of the first battery cell module and the negative electrode of the second battery cell module, and a first negative electrode connecting plate connecting the negative electrode of the third battery cell module with the negative electrode of the fourth battery cell module.

As a further improvement of the present invention, the third contact terminal includes a second positive electrode connecting plate and a second negative electrode connecting plate, the second positive electrode connecting plate is respectively connected to the positive electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and the second negative electrode connecting plate is respectively connected to the negative electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

As a further improvement of the present invention, the sliding body includes a first body, a second body and a third body which are parallel to each other and spaced apart, the first contact terminal is formed and exposed on the first body, the second contact terminal is formed and exposed on the second body, and the third contact terminal is formed and exposed on the third body; the sliding body also includes a sliding rod arranged perpendicular to the second body and a sliding portion located at the end of the sliding rod, the sliding rod protrudes beyond the outer surface of the shell so that the sliding portion is exposed outside the shell, and the sliding portion is used to push the sliding body to switch between the first position, the second position and the third position.

As a further improvement of the present invention, a slide groove and limit blocks located on both sides of the slide groove are provided on the shell, and the sliding part slides along the slide groove to switch between a first position, a second position and a third position, and the limit blocks are used to limit and fix the sliding part in the first position, the second position or the third position; the sliding part includes a base sliding along the slide groove and limit parts protruding outward from both sides of the base, so that the sliding part is roughly cross-shaped; two limit blocks are respectively arranged on both sides of the slide groove, and a limited space is formed between the two limit blocks, and when the sliding part is in the first position or the third position, the outer wall surface of the limit part abuts against the outer wall surface of the corresponding limit block; when the sliding part is in the second position, the limit part is accommodated in the limit space.

As a further improvement of the present invention, a receiving cavity is provided in the connecting body, the sliding assembly is received in the receiving cavity and is electrically connected to the connecting terminal, the connecting terminal includes a first positive terminal and a first negative terminal, four first positive terminals are provided to electrically connect to the positive poles of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, respectively, and four first negative terminals are also provided to electrically connect to the negative poles of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, respectively.

To achieve the above object, the present invention further provides a charging system, comprising:

A battery pack, the battery pack comprising a shell, a battery pack contained in the shell, and a conversion component electrically connected to the battery pack, the battery pack comprising at least a first battery cell module, a second battery cell module, a third battery cell module, and a fourth battery cell module, the conversion component comprising a connecting component electrically connected to the battery pack and a sliding component electrically connected to the connecting component, the sliding component being slidably arranged relative to the connecting component, and when the sliding component is located at a first position, the battery pack outputs a first voltage value; when the sliding component slides to a second position, the battery pack outputs a second voltage value; when the sliding component slides to a third position, the battery pack outputs a third voltage value; the first voltage value is greater than the second voltage value, and the second voltage value is greater than the third voltage value;

A charger is used to charge the battery pack. When the charger is docked with the battery pack for charging, the sliding assembly is located at a third position, and the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in parallel.

The beneficial effect of the present invention is that the battery pack of the present invention realizes the series-parallel state switching of each battery cell module in the battery pack by controlling the sliding position of the sliding component, and then realizes the change of the output voltage of the battery pack, thereby improving the adaptability of the tool system with the battery pack.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a battery pack of the present invention.

FIG. 2 is an exploded view of the battery pack shown in FIG. 1 .

FIG. 3 is an exploded view of the housing in FIG. 2 .

FIG. 4 is an enlarged view of the limit block and the slide groove in FIG. 3 .

FIG. 5 is an exploded view of the terminal assembly of FIG. 2 .

FIG. 6 is a schematic diagram of FIG. 5 from another angle.

FIG. 7 is an exploded view of the conversion assembly of FIG. 2 .

FIG. 8 is an exploded view of the connection assembly in FIG. 7 .

FIG. 9 is a three-dimensional view of the sliding assembly in FIG. 7 from another angle.

FIG. 10 is an exploded view of the sliding assembly in FIG. 7 .

FIG. 11 is a schematic structural diagram of the first external inserting seat after being inserted and the sliding portion is in the first position.

FIG. 12 is a schematic structural diagram of the connection terminal and the first contact terminal after the first external plug-in seat is inserted.

FIG. 13 is a connection circuit diagram of the battery pack after the first external plug-in socket is inserted.

FIG. 14 is a schematic structural diagram of the sliding portion in the second position after the second external inserting seat is inserted.

FIG. 15 is a schematic structural diagram of the connection terminal and the second contact terminal after the second external plug-in seat is inserted.

FIG. 16 is a connection circuit diagram of the battery pack after the second external plug-in socket is inserted.

FIG. 17 is a schematic structural diagram of the sliding portion in the third position after the third external insert seat is inserted.

FIG. 18 is a schematic structural diagram of the connection terminal and the third contact terminal after the third external plug-in socket is inserted.

FIG. 19 is a connection circuit diagram of the battery pack after the third external plug-in socket is inserted.

DETAILED DESCRIPTION

In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, the present invention discloses a battery pack 100, including a shell 10 and a battery pack 20 housed in the shell 10, a PCB board 30, and a conversion assembly 40 and a terminal assembly 50 electrically connected to the battery pack 20. The battery pack 20 includes a plurality of battery cell modules, and the terminal assembly 50 is electrically connected to the battery cell modules. In the present invention, the terminal assembly 50 is preferably a female terminal assembly, but should not be limited to this. The battery pack 100 of the present invention is used on a tool system, which also includes an external plug-in socket (not shown) that can be inserted into the battery pack 100 to dock with the conversion assembly 40 of the battery pack 100.

The battery pack 20 at least includes a first battery module 21, a second battery module 22, a third battery module 23 and a fourth battery module 24; each battery module is provided with a plurality of battery cells, which can be connected in series or in parallel, and will not be described in detail here. Assume that the rated output voltage of each battery module is "n" V, that is, the rated output voltage u ₁ of the first battery module 21 = the rated output voltage u ₂ of the second battery module 22 = the rated output voltage u ₃ of the third battery module 23 = the rated output voltage u ₄ of the fourth battery module 24 = "n" V.

As shown in FIG3 and FIG4, the housing 10 includes an upper housing 11 and a lower housing 12 assembled with each other and a receiving space 13 formed between the upper housing 11 and the lower housing 12, and the battery pack 20, the PCB board 30, the conversion assembly 40 and the terminal assembly 50 are all received in the receiving space 13. A slide groove 111 and stop blocks 112 located at both sides of the slide groove 111 are provided on the top wall of the upper housing 11, the slide groove 111 is arranged in a rectangular shape, and two stop blocks 112 are respectively provided at both sides of the slide groove 111, and the two stop blocks 112 are spaced from each other to form a stop space 113 between the two stop blocks 112.

The limit blocks 112 located on both sides of the slide 111 are defined as a first limit block 1121, a second limit block 1122, a third limit block 1123 and a fourth limit block 1124, wherein the first limit block 1121 is adjacent to and symmetrically arranged with the second limit block 1122, the third limit block 1123 is adjacent to and symmetrically arranged with the fourth limit block 1124, the first limit block 1121 and the third limit block 1123 are symmetrically arranged with respect to the slide 111, and the second limit block 1122 and the fourth limit block 1124 are symmetrically arranged with respect to the slide 111. The limit space 113 is formed between the first limit block 1121 and the second limit block 11222 and between the third limit block 1123 and the fourth limit block 1124.

In the present invention, each limit block 112 is arranged in a spring-shaped manner so that it can undergo elastic deformation and elastic reset under certain circumstances; each limit block 112 is formed with an arc-shaped outer wall surface 114 on the side facing the slide groove 111, and the arc-shaped outer wall surface 114 can play a guiding role under certain circumstances; but it should not be limited to this.

The upper shell 11 is also provided with a socket 115 for inserting an external plug-in socket. There are two sockets 115 , corresponding to the positive output and the negative output of the battery pack 100 , respectively.

As shown in Figures 5 and 6, the terminal assembly 50 is electrically connected to the electrodes of the four battery modules through the PCB board 30. Specifically, the terminal assembly 50 includes a fixed seat 51 and a fixed terminal 52 plugged and fixed in the fixed seat 51, and the fixed terminal 52 includes a first fixed terminal 521 and a second fixed terminal 522 arranged left and right in a straight line, wherein the first fixed terminal 521 is a positive terminal for electrically connecting to the positive electrode of the corresponding battery module; the second fixed terminal 522 is a negative terminal for electrically connecting to the negative electrode of the corresponding battery module. Correspondingly, there are 4 first fixed terminals 521 and 4 second fixed terminals 522, and they are arranged from left to right in a ++++---- manner to connect to the four battery modules respectively.

The fixing seat 51 is provided with a receiving groove 511 for receiving the fixing terminal 52. Each fixing terminal 52 has a first plug-in portion 523, a second plug-in portion 524, and a connecting portion 525 connecting the first plug-in portion 523 and the second plug-in portion 524. The connecting portion 525 is assembled and fixed in the receiving groove 511. The first plug-in portion 523 and the second plug-in portion 524 are perpendicular to each other, and the first plug-in portion 523 protrudes from the receiving groove 511 in the horizontal direction beyond the front end of the fixing seat 51 to be electrically connected to the conversion assembly 40; the second plug-in portion 524 protrudes from the receiving groove 511 in the vertical direction beyond the bottom of the fixing seat 51, so that the second plug-in portion 524 is plugged and fixed with the PCB board 30 in the vertical direction and electrically connected, thereby realizing the electrical connection between the second plug-in portion 524 and the positive and negative electrodes of the four battery modules.

As shown in Figures 7 to 10, the conversion component 40 includes a connecting component 41 electrically connected to the battery pack 20 and a sliding component 42 electrically connected to the connecting component 41, the sliding component 42 is slidably arranged relative to the connecting component 41, and when the sliding component 42 is located at the first position, the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24 are connected in series, and the battery pack 100 outputs a first voltage value; when the sliding component 42 slides to the second position, the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24 are connected in series and parallel, and the battery pack 100 outputs a second voltage value; when the sliding component 42 slides to the third position, the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24 are connected in parallel, and the battery pack 100 outputs a third voltage value. The first voltage value is greater than the second voltage value, and the second voltage value is greater than the third voltage value.

The connecting assembly 41 is electrically connected to the terminal assembly 50, and includes a connecting body 410 and a connecting terminal 411 formed on the connecting body 410. The connecting body 410 is recessed with a receiving cavity 4101, one end of the connecting terminal 411 is received and exposed in the receiving cavity 4101, and the other end is located outside the connecting body 410. The sliding assembly 42 is received in the receiving cavity 4101 and is electrically connected to the connecting terminal 411 in the receiving cavity 4101. The connecting terminal 411 includes a first positive terminal 412 and a first negative terminal 413. The first positive terminal 412 is provided in four pieces to be electrically connected to the positive poles of the first cell module 21, the second cell module 22, the third cell module 23 and the fourth cell module 24, respectively. The first negative terminal 413 is also provided in four pieces to be electrically connected to the negative poles of the first cell module 21, the second cell module 22, the third cell module 23 and the fourth cell module 24, respectively.

In this embodiment, the connection terminal 411 is detachably assembled and fixed on the connection body 410. Since the connection terminal 411 is easily worn after multiple sliding frictions, which leads to poor electrical connection stability between the connection terminal 411 and the sliding assembly 42, the connection terminal 411 is designed to be detachable, and the connection terminal 411 can be directly replaced after the connection terminal 411 is worn, without replacing the entire connection assembly 41, thereby reducing costs.

It should be noted that: in the present invention, the connection assembly 41 is not directly connected to the four battery modules, but the connection assembly 41 is indirectly connected to the four battery modules through the current transmission of the terminal assembly 50. Specifically, the first positive terminal 412 of the connection assembly 41 is connected to the first fixed terminal 521 of the terminal assembly 50 in FIG. 5, and the first negative terminal 413 of the connection assembly 41 is connected to the second fixed terminal 522 of the terminal assembly 50.

In the present invention, the first positive terminal 412 and the first negative terminal 413 are arranged in the shape of connecting sheets, so as to be assembled and fixed with the connecting body 410 and one end is exposed in the accommodating cavity 4101. In addition, the other ends of the first positive terminal 412 and the first negative terminal 413 are also conveniently plugged into the first plug-in portion 523 of the first fixed terminal 521 and the second fixed terminal 522 to realize the electrical connection between the connecting terminal 411 and the fixed terminal 52; of course, this should not be limited to this.

The bottom inner wall of the connection body 410 is provided with eight openings 4102, which correspond to the four first positive terminals 412 and the four first negative terminals 413, respectively, so that one end of the four first positive terminals 412 and the four first negative terminals 413 are received and exposed in the corresponding openings 4102. The first positive terminal 412 and the first negative terminal 413 each include a contact portion 416, a mounting portion 417 extending backward from the contact portion 416, and a docking portion 418 extending backward from the mounting portion 417, and the thickness of the contact portion 416 is greater than the thickness of the mounting portion 417, so that after the connection body 410 and the connection terminal 411 are assembled, the contact portions 416 of the first positive terminal 412 and the first negative terminal 413 protrude and are received in the openings 4102, so that the sliding assembly 42 is directly electrically connected to the contact portion 416 in the opening 4102. The mounting portion 417 is assembled and fixed in the connecting body 410 , and the docking portion 418 is used to dock with the first plug-in portion 523 of the first fixed terminal 521 and the second fixed terminal 522 of the terminal assembly 50 to achieve electrical connection between the terminal assembly 50 and the conversion assembly 40 .

The connection terminal 411 also includes a second positive terminal 414 and a second negative terminal 415 located outside the connection body 410. The second positive terminal 414 is formed on the first positive terminal 412 corresponding to the positive pole of the first battery module 21, so as to be connected to the external plug-in seat as a total positive output terminal; the second negative terminal 415 is formed on the first negative terminal 413 corresponding to the negative pole of the fourth battery module 24, so as to be connected to the external plug-in seat as a total negative output terminal, so as to achieve the output of the voltage in the battery pack 100. The second positive terminal 414 and the second negative terminal 415 are both arranged near the jack 115 so as to be connected to the external plug-in seat.

The sliding component 42 includes a sliding body 421 and a first contact terminal 43, a second contact terminal 44 and a third contact terminal 45 formed on the sliding body 421 and spaced apart from each other. The first contact terminal 43, the second contact terminal 44 and the third contact terminal 45 are used to electrically connect with the contact portion 416 of the connecting terminal 411, and when the sliding component 42 is located at the first position, the contact portion 416 of the connecting terminal 411 is only electrically connected with the first contact terminal 43, when the sliding component 42 slides to the second position, the contact portion 416 of the connecting terminal 411 is only electrically connected with the second contact terminal 44, and when the sliding component 42 slides to the third position, the contact portion 416 of the connecting terminal 411 is only electrically connected with the third contact terminal 45.

The first contact terminal 43, the second contact terminal 44 and the third contact terminal 45 are arranged at intervals along the sliding direction (up and down direction) of the sliding component 42. When the contact portion 416 of the connecting terminal 411 is electrically connected to the first contact terminal 43, the first battery module 21, the second battery module 22, the third battery module 23 and the fourth battery module 24 are connected in series. At this time, the first voltage value output by the battery pack 100 is "4n" V; when the contact portion 416 of the connecting terminal 411 is electrically connected to the second contact terminal 44, the first battery module 21, the second battery module 22, the third battery module 23 and the fourth battery module 24 are connected in series. When the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24 are connected in series and parallel (i.e., first connected in parallel and then in series), the second voltage value output by the battery pack 100 is "2n" V; when the contact portion 416 of the connecting terminal 411 is electrically connected to the third contact terminal 45, the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24 are connected in parallel with each other, and the third voltage value output by the battery pack 100 is "n" V.

Specifically, the first contact terminal 43 includes a first connecting piece 431 connecting the positive electrode of the second battery cell module 22 with the negative electrode of the first battery cell module 21, a second connecting piece 432 connecting the positive electrode of the third battery cell module 23 with the negative electrode of the second battery cell module 22, and a third connecting piece 433 connecting the positive electrode of the fourth battery cell module 24 with the negative electrode of the third battery cell module 23, so as to realize the series connection of the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24. At this time, the first voltage value "4n" V is equal to the sum of the rated output voltages of the four battery cell modules.

The second contact terminal 44 includes a first positive electrode connecting piece 441 connecting the positive electrode of the first battery cell module 21 with the positive electrode of the second battery cell module 22, a fourth connecting piece 442 connected to the positive electrode of the third battery cell module 23, the positive electrode of the fourth battery cell module 24, the negative electrode of the first battery cell module 21 and the negative electrode of the second battery cell module 22, and a first negative electrode connecting piece 443 connecting the negative electrode of the third battery cell module 23 with the negative electrode of the fourth battery cell module 24. With such a design, a connection mode can be formed in which the first battery cell module 21 is connected in parallel with the second battery cell module 22, the third battery cell module 23 is connected in parallel with the fourth battery cell module 24, and then connected in series (i.e., first in parallel and then in series), at which time the second voltage value "2n" V is equal to the sum of the rated output voltages of the two battery cell modules.

The third contact terminal 45 includes a second positive electrode connecting piece 451 and a second negative electrode connecting piece 452, wherein the second positive electrode connecting piece 451 is respectively connected to the positive electrodes of the first battery module 21, the second battery module 22, the third battery module 23 and the fourth battery module 24, and the second negative electrode connecting piece 452 is respectively connected to the negative electrodes of the first battery module 21, the second battery module 22, the third battery module 23 and the fourth battery module 24. With such a design, the first battery module 21, the second battery module 22, the third battery module 23 and the fourth battery module 24 are connected in parallel with each other, and at this time, the third voltage value "n" V is equal to the rated output voltage of each battery module.

The sliding body 421 includes a first body 422, a second body 423 and a third body 424 which are arranged parallel to each other and spaced apart, and a connecting column 425 connecting the first body 422, the second body 423 and the third body 424 in the width direction thereof, the first contact terminal 43 is formed and exposed on the first body 422, the second contact terminal 44 is formed and exposed on the second body 423, and the third contact terminal 45 is formed and exposed on the third body 424. Two connecting columns 425 are provided, and two elastic members 46 are respectively sleeved on the corresponding connecting columns 425, so as to drive the sliding assembly 42 to reset after the sliding of the sliding assembly 42 is completed.

The sliding body 421 further includes a sliding rod 426 arranged perpendicular to the second body 423 and a sliding portion 427 located at the end of the sliding rod 426. The sliding rod 426 protrudes beyond the outer surface of the upper shell 11 and is limitedly received in the slide groove 111, so that the sliding portion 427 is exposed outside the upper shell 11. The sliding portion 427 is used to push the sliding body 421 to slide along the slide groove 111, and then switch between the first position, the second position and the third position. One end of the elastic member 46 is fixed to the first body 422, and the other end is in contact with and fixed to the inner wall surface of the receiving cavity 4101 of the connecting body 410 (i.e., abutting each other), so that when the sliding assembly 42 slides, the elastic member 46 is elastically compressed or released, so that the contact portion 416 of the connecting terminal 411 is switchably connected between the first contact terminal 43, the second contact terminal 44 and the third contact terminal 45.

As shown in FIG. 4 , the four limiting blocks 112 on the upper housing 11 are used to limit and fix the sliding portion 427 at the first position, the second position, or the third position. Specifically, the sliding portion 427 includes a base 4271 that slides along the slide groove 111 and a limiting portion 4272 that protrudes outward from both sides of the base 4271, so that the sliding portion 427 is roughly cross-shaped; when the sliding portion 427 is located at the first position, the outer wall surface of the limiting portion 4272 abuts against the outer wall surfaces 114 of the second limiting block 1122 and the fourth limiting block 1124; when the sliding portion 427 is located at the second position, the limiting portion 4272 is accommodated in the limiting space 113; when the sliding portion 427 is located at the third position, the outer wall surface of the limiting portion 4272 abuts against the outer wall surfaces 114 of the first limiting block 1121 and the third limiting block 1123; in this way, the sliding portion 427 can be fixed at the corresponding position.

For the convenience of description, the tool system is defined to include a first electric tool (not shown), a second electric tool (not shown) and a third electric tool (not shown). The first electric tool is provided with a first external plug-in socket, which can be operated at a first rated voltage; the second electric tool is provided with a second external plug-in socket, which can be operated at a second rated voltage; the third electric tool is provided with a third external plug-in socket, which can be operated at a third rated voltage. The following will take these three external plug-in sockets as an example to explain in detail the voltage switching principle of the battery pack 100 of the present invention. It is defined that each battery cell module is composed of 5 battery cells connected in series, and the voltage of each battery cell module is 20V.

As shown in FIGS. 11 to 13 , when the battery pack 100 is connected to the first external plug-in socket of the first electric tool, the sliding assembly 42 is located at the first position, at which time the two elastic members 46 are both in the initial state, the base 4271 of the sliding portion 427 is located at the bottom end of the slide slot 111, the upper side surfaces of the two limiting portions 4272 are respectively in contact with the outer wall surfaces 114 of the corresponding second limiting blocks 1122 and the fourth limiting blocks 1124, the contact portion 416 of the connecting terminal 411 is electrically connected to the first contact terminal 43, and the first battery module 21, the second battery module 22, the third battery module 23 and the fourth battery module 24 are connected in series. According to the principle of "parallel voltage division and series current division", at this time, the first voltage value output by the battery pack 100 is equal to the sum of the rated output voltages of the four battery modules, that is, U=u ₁ +u ₂ +u ₃ +u ₄ =80V.

As shown in FIGS. 14 to 16 , when the battery pack 100 is connected to the second external plug-in socket of the second electric tool, the sliding assembly 42 slides upward to the second position, at which time the two elastic members 46 are compressed, the base 4271 of the sliding portion 427 is located at the middle position of the slide groove 111, and the two limiting portions 4272 are both limited and accommodated in the limiting space 113, and the contact portion 416 of the connecting terminal 411 is electrically connected to the second contact terminal 44, realizing the connection mode of the first battery cell module 21 and the second battery cell module 22 in parallel, the third battery cell module 23 and the fourth battery cell module 24 in parallel, and then connected in series with each other (i.e., first in parallel and then in series). According to the principle of "parallel voltage division, series current division", at this time, the second voltage value output by the battery pack 100 is equal to the sum of the rated output voltages of the two battery cell modules, i.e., U=u ₁ +u ₂ =u ₃ +u ₄ =40V.

As shown in FIGS. 17 to 19, when the battery pack 100 is connected to the third external plug-in socket of the third electric tool, the sliding assembly 42 slides upward to the third position, at which time the two elastic members 46 are compressed, the base 4271 of the sliding portion 427 is located at the top of the slide slot 111, the lower side surfaces of the two limiting portions 4272 are respectively in contact with the outer wall surfaces 114 of the corresponding first limiting block 1121 and the third limiting block 1123, and the contact portion 416 of the connecting terminal 411 is electrically connected to the third contact terminal 45, thus realizing the parallel connection of the first battery module 21, the second battery module 22, the third battery module 23 and the fourth battery module 24. According to the principle of "parallel voltage division and series current division", the third voltage value output by the battery pack 100 is equal to the rated output voltage of each battery module, that is, U=u ₁ =u ₂ =u ₃ =u ₄ =20V.

Based on the above, it can be seen that: after selecting different external plug-in sockets, different voltage outputs of the battery pack 100 can be achieved to meet the voltage requirements of three different power tools, and the switching between the three voltages is fast and convenient.

In this embodiment, the sliding of the sliding part 427 is manually adjusted. When adjusting, the sliding part 427 is directly pushed or pulled toward the first position, the second position, or the third position, so that the elastic member 46 is compressed or released, and the corresponding limit block 112 is elastically deformed, which facilitates the movement of the sliding part 427. After the sliding part 427 reaches the target position, the limit block 112 automatically resets, further playing the role of limiting the sliding part 427.

Of course, in other embodiments, the sliding of the sliding portion 427 can also be designed to be non-manual push-pull. In this case, the connecting body 410 and the external plug-in seat need to be designed accordingly to achieve the effect of "when the external plug-in seat is inserted, the external plug-in seat synchronously pushes the sliding portion 427 to slide". A detailed description is not given here.

The battery pack 100 of the present invention can also be applied to a charging system (not shown), which includes the aforementioned battery pack 100 and a charger for charging the battery pack 100. When the charger is docked with the battery pack 100 for charging, the sliding component 42 slides to the third position. At this time, the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24 are connected in parallel with each other, and the charging voltage output by the charger is equal to the rated output voltage of a single battery cell module, which is a low voltage. Of course, when charging, the sliding component 42 can also be located in the first position. At this time, the first battery cell module 21, the second battery cell module 22, the third battery cell module 23 and the fourth battery cell module 24 are connected in series with each other, and the charging voltage output by the charger is equal to the sum of the rated output voltages of the four battery cell modules.

To summarize, the battery pack 100 of the present invention sets the first contact terminal 43, the second contact terminal 44 and the third contact terminal 45 at different positions of the sliding body 421, so that when the sliding component 42 slides and switches between the first position, the second position and the third position, the selective electrical connection between the connecting terminal 411 and the first contact terminal 43 or the second contact terminal 44 or the third contact terminal 45 can be utilized to realize the series-parallel state switching of the battery cell modules in the battery pack 100, and then realize the change of the output voltage of the battery pack 100, thereby improving the adaptability of the tool system having the battery pack 100.

The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (13)

1. The utility model provides a battery package, includes the casing, holds the group battery and with group battery electric connection's conversion component in the casing, the group battery includes first electric core module, second electric core module, third electric core module and fourth electric core module, its characterized in that: the conversion assembly comprises a connection assembly electrically connected with the battery pack and a sliding assembly electrically connected with the connection assembly, the sliding assembly is arranged in a sliding manner relative to the connection assembly, the connection assembly comprises a connection body and a connection terminal formed on the connection body, the sliding assembly comprises a sliding body, a first contact terminal, a second contact terminal and a third contact terminal which are formed on the sliding body and are arranged at intervals, when the sliding assembly is positioned at a first position, the connection terminal is electrically connected with the first contact terminal, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in series, and the battery pack outputs a first voltage value; when the sliding component slides to a second position, the connecting terminal is electrically connected with the second contact terminal, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are combined in series-parallel, and the battery pack outputs a second voltage value; when the sliding component slides to a third position, the connecting terminal is electrically connected with the third contact terminal, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in parallel, and the battery pack outputs a third voltage value; the first voltage value is larger than the second voltage value, and the second voltage value is larger than the third voltage value;

The first contact terminal comprises a first connecting piece for connecting the positive electrode of the second battery cell module with the negative electrode of the first battery cell module, a second connecting piece for connecting the positive electrode of the third battery cell module with the negative electrode of the second battery cell module, and a third connecting piece for connecting the positive electrode of the fourth battery cell module with the negative electrode of the third battery cell module, so that the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are mutually connected in series;

The second contact terminal comprises a first positive electrode connecting sheet for connecting the positive electrode of the first electric core module with the positive electrode of the second electric core module, a fourth connecting sheet for connecting the positive electrode of the third electric core module, the positive electrode of the fourth electric core module, the negative electrode of the first electric core module and the negative electrode of the second electric core module respectively, and a first negative electrode connecting sheet for connecting the negative electrode of the third electric core module with the negative electrode of the fourth electric core module;

The third contact terminal comprises a second positive electrode connecting sheet and a second negative electrode connecting sheet, the second positive electrode connecting sheet is respectively connected with the positive electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and the second negative electrode connecting sheet is respectively connected with the negative electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

2. The battery pack according to claim 1, wherein: the sliding body comprises a first body, a second body and a third body which are mutually parallel and are arranged at intervals, the first contact terminal is formed and exposed to the first body, the second contact terminal is formed and exposed to the second body, and the third contact terminal is formed and exposed to the third body; the sliding body further comprises a sliding rod perpendicular to the second body and a sliding part located at the tail end of the sliding rod, the sliding rod protrudes out of the outer surface of the shell, so that the sliding part is exposed out of the shell, and the sliding part is used for pushing the sliding body to switch among a first position, a second position and a third position.

3. The battery pack according to claim 2, wherein: the sliding body further comprises a connecting column and an elastic piece, wherein the connecting column is connected with the first body, the second body and the third body in the width direction of the connecting column, the elastic piece is sleeved on the connecting column, one end of the elastic piece is fixed to the first body, the other end of the elastic piece is in contact with the connecting body and is fixed, and when the sliding body is located at the second position or the third position, the elastic piece is elastically compressed.

4. The battery pack according to claim 2, wherein: the shell is provided with a chute and limiting blocks positioned on two sides of the chute, the sliding part slides along the chute so as to switch among a first position, a second position and a third position, and the limiting blocks are used for limiting and fixing the sliding part at the first position or the second position or the third position.

5. The battery pack according to claim 4, wherein: the sliding part comprises a base part sliding along the sliding groove and limiting parts protruding outwards from two sides of the base part, so that the sliding part is approximately cross-shaped; two limiting blocks are respectively arranged on two sides of the sliding groove, a limiting space is formed between the two limiting blocks, and when the sliding part is positioned at the first position or the third position, the outer wall surface of the limiting part is in mutual abutting connection with the outer wall surface of the corresponding limiting block; when the sliding part is positioned at the second position, the limiting part is accommodated in the limiting space.

6. The battery pack according to claim 1, wherein: the connecting body is internally provided with an accommodating cavity, the sliding component is accommodated in the accommodating cavity and electrically connected with the connecting terminal, the connecting terminal comprises a first positive electrode terminal and a first negative electrode terminal, the first positive electrode terminal is provided with 4 connecting terminals respectively electrically connected with positive electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and the first negative electrode terminal is also provided with 4 connecting terminals respectively electrically connected with negative electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

7. The battery pack according to claim 6, wherein: one end of the connecting terminal is accommodated in the accommodating cavity, the other end of the connecting terminal is positioned outside the connecting body, the connecting terminal further comprises a second positive terminal and a second negative terminal which are positioned outside the connecting body, and the second positive terminal is formed on the first positive terminal corresponding to the positive electrode of the first cell module to serve as a total positive output terminal; the second negative terminal is formed on the first negative terminal corresponding to the negative electrode of the fourth cell module as a total negative output terminal.

8. A tool system, comprising:

The battery pack comprises a shell, a battery pack accommodated in the shell and a conversion assembly electrically connected with the battery pack, wherein the battery pack at least comprises a first battery cell module, a second battery cell module, a third battery cell module and a fourth battery cell module, the conversion assembly comprises a connection assembly electrically connected with the battery pack and a sliding assembly electrically connected with the connection assembly, the sliding assembly is arranged in a sliding manner relative to the connection assembly, the connection assembly comprises a connection body and a connection terminal formed on the connection body, and the sliding assembly comprises a sliding body, a first contact terminal, a second contact terminal and a third contact terminal which are formed on the sliding body and are arranged at intervals;

a first power tool operable at a first rated voltage, the first power tool provided with a first external blade seat;

a second power tool operable at a second rated voltage, the second power tool provided with a second external insert seat;

A third power tool operable at a third rated voltage, the third power tool provided with a third external blade seat;

When the battery pack is connected with a first external inserting piece seat of a first electric tool, the sliding component is positioned at a first position, the connecting terminal is electrically connected with the first contact terminal at the moment, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are mutually connected in series, and the battery pack outputs a first voltage value; the first contact terminal comprises a first connecting piece for connecting the positive electrode of the second battery cell module with the negative electrode of the first battery cell module, a second connecting piece for connecting the positive electrode of the third battery cell module with the negative electrode of the second battery cell module, and a third connecting piece for connecting the positive electrode of the fourth battery cell module with the negative electrode of the third battery cell module, so that the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are mutually connected in series;

When the battery pack is connected with a second external inserting piece seat of a second electric tool, the sliding component slides to a second position, the connecting terminal is electrically connected with the second contact terminal at the moment, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are combined in series-parallel, and the battery pack outputs a second voltage value; the second contact terminal comprises a first positive electrode connecting sheet for connecting the positive electrode of the first electric core module with the positive electrode of the second electric core module, a fourth connecting sheet for connecting the positive electrode of the third electric core module, the positive electrode of the fourth electric core module, the negative electrode of the first electric core module and the negative electrode of the second electric core module respectively, and a first negative electrode connecting sheet for connecting the negative electrode of the third electric core module with the negative electrode of the fourth electric core module;

When the battery pack is connected with a third external inserting piece seat of a third electric tool, the sliding component slides to a third position, the connecting terminal is electrically connected with the third contact terminal at the moment, the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in parallel, and the battery pack outputs a third voltage value; the first voltage value is larger than the second voltage value, and the second voltage value is larger than the third voltage value; the third contact terminal comprises a second positive electrode connecting sheet and a second negative electrode connecting sheet, the second positive electrode connecting sheet is respectively connected with the positive electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and the second negative electrode connecting sheet is respectively connected with the negative electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

9. The tool system according to claim 8, wherein: the first voltage value is "4n" V, the second voltage value is "2n" V, and the third voltage value is "n" V.

10. The tool system according to claim 8, wherein: the sliding body comprises a first body, a second body and a third body which are mutually parallel and are arranged at intervals, the first contact terminal is formed and exposed to the first body, the second contact terminal is formed and exposed to the second body, and the third contact terminal is formed and exposed to the third body; the sliding body further comprises a sliding rod perpendicular to the second body and a sliding part located at the tail end of the sliding rod, the sliding rod protrudes out of the outer surface of the shell, so that the sliding part is exposed out of the shell, and the sliding part is used for pushing the sliding body to switch among a first position, a second position and a third position.

11. The tool system according to claim 10, wherein: the shell is provided with a chute and limiting blocks positioned at two sides of the chute, the sliding part slides along the chute to switch among a first position, a second position and a third position, and the limiting blocks are used for limiting and fixing the sliding part at the first position or the second position or the third position; the sliding part comprises a base part sliding along the sliding groove and limiting parts protruding outwards from two sides of the base part, so that the sliding part is approximately cross-shaped; two limiting blocks are respectively arranged on two sides of the sliding groove, a limiting space is formed between the two limiting blocks, and when the sliding part is positioned at the first position or the third position, the outer wall surface of the limiting part is in mutual abutting connection with the outer wall surface of the corresponding limiting block; when the sliding part is positioned at the second position, the limiting part is accommodated in the limiting space.

12. The tool system according to claim 8, wherein: the connecting body is internally provided with an accommodating cavity, the sliding component is accommodated in the accommodating cavity and electrically connected with the connecting terminal, the connecting terminal comprises a first positive electrode terminal and a first negative electrode terminal, the first positive electrode terminal is provided with 4 connecting terminals respectively electrically connected with positive electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and the first negative electrode terminal is also provided with 4 connecting terminals respectively electrically connected with negative electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module.

13. A charging system, comprising:

the battery pack comprises a shell, a battery pack and a conversion assembly, wherein the battery pack is accommodated in the shell, the conversion assembly is electrically connected with the battery pack, the battery pack at least comprises a first battery cell module, a second battery cell module, a third battery cell module and a fourth battery cell module, the conversion assembly comprises a connection assembly electrically connected with the battery pack and a sliding assembly electrically connected with the connection assembly, the sliding assembly is arranged in a sliding manner relative to the connection assembly, the connection assembly comprises a connection body and a connection terminal formed on the connection body, the sliding assembly comprises a sliding body, a first contact terminal, a second contact terminal and a third contact terminal which are formed on the sliding body and are arranged at intervals, when the sliding assembly is positioned at a first position, the connection terminal is electrically connected with the first contact terminal, the first contact terminal comprises a first connection tab which connects the positive electrode of the second battery cell module with the negative electrode of the first battery cell module, a second connection piece which connects the positive electrode of the third battery cell module with the negative electrode of the second battery cell module, and a third battery cell module and a fourth battery cell module which connects the positive electrode of the third battery cell module with the negative electrode of the second battery cell module at the moment with the fourth battery cell module in series, and the first battery pack and the fourth battery cell module are connected with each other; when the sliding component slides to a second position, the connecting terminal is electrically connected with the second contact terminal, the second contact terminal comprises a first positive electrode connecting sheet for connecting the positive electrode of the first battery cell module with the positive electrode of the second battery cell module, a fourth connecting sheet for respectively connecting the positive electrode of the third battery cell module, the positive electrode of the fourth battery cell module, the negative electrode of the first battery cell module and the negative electrode of the second battery cell module, and a first negative electrode connecting sheet for connecting the negative electrode of the third battery cell module with the negative electrode of the fourth battery cell module, and the battery pack outputs a second voltage value at the moment; when the sliding component slides to a third position, the connecting terminal is electrically connected with the third contact terminal, the third contact terminal comprises a second positive electrode connecting piece and a second negative electrode connecting piece, the second positive electrode connecting piece is respectively connected with the positive electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and the second negative electrode connecting piece is respectively connected with the negative electrodes of the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module, and at the moment, the battery pack outputs a third voltage value; the first voltage value is larger than the second voltage value, and the second voltage value is larger than the third voltage value;

the charger is used for charging the battery pack, when the charger charges in butt joint with the battery pack, the sliding assembly is located at a third position, and the first battery cell module, the second battery cell module, the third battery cell module and the fourth battery cell module are connected in parallel.