CN114335833A

CN114335833A - Battery pack and electric tool adopting same

Info

Publication number: CN114335833A
Application number: CN202111069524.2A
Authority: CN
Inventors: 胡桂伍; 杨东; 王槐树
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-09-30
Filing date: 2021-09-13
Publication date: 2022-04-12

Abstract

The invention discloses a battery pack and an electric tool using the battery pack, comprising: the electric core assembly is arranged in the inner cavity; the battery cell assembly comprises a plurality of battery cell units; the battery pack interface is at least electrically connected with the electric core component; the circuit board is connected between the electric core assembly and the battery pack interface in series; the positive terminal of the battery core assembly is at least connected with the positive electrode of the battery cell unit; and a negative terminal of the cell assembly, connected at least to the negative electrode of the cell unit; the battery pack interface includes: the battery pack positive terminal is connected with the positive terminal of the battery core assembly; the battery pack negative terminal is connected with the negative terminal of the battery cell assembly; the first bracket is positioned on the upper side of the lower shell and used for fixing a positive terminal of the battery pack and a negative terminal of the battery pack; the second support is positioned on the upper side of the circuit board and connected with the circuit board, and the second support is detachably connected with the first support. By adopting the technical scheme, the maintenance of the battery pack can be facilitated, and the use cost of the battery pack is obviously reduced.

Description

Battery pack and electric tool adopting same

Technical Field

The invention relates to a battery pack and an electric tool adopting the battery pack.

Background

Cordless power tools and other wireless devices use rechargeable battery packs as a power source. These battery packs are typically removably connected to other tools or devices. The battery pack may be repeatedly charged and discharged to allow the user to reuse the tool without purchasing a new power source.

However, these battery packs are usually an integral unit, and when a fault occurs, they are difficult to disassemble for maintenance, and a new power supply is often purchased, which greatly increases the use cost.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a battery pack which is convenient to maintain and reduces the use cost.

In order to achieve the above object, the present invention adopts the following technical solutions:

a battery pack, comprising: a housing comprising an upper housing and a lower housing assembled at an interface to form an internal cavity; an electrical core assembly disposed within the internal cavity; the battery cell assembly comprises a plurality of battery cell units; the battery pack interface is at least electrically connected with the electric core assembly; a circuit board connected in series between the battery pack assembly and the battery pack interface; wherein, the electric core subassembly includes: a plurality of non-cylindrical cell units; the positive terminal of the battery core assembly is connected with at least the positive electrode of the battery cell unit; and a cell assembly negative terminal connected to at least the negative electrode of the cell unit; the battery pack interface includes: the battery pack positive terminal is connected with the battery core component positive terminal; the battery pack negative terminal is connected with the battery core component negative terminal; the first bracket is positioned on the upper side of the lower shell and used for fixing the positive terminal of the battery pack and the negative terminal of the battery pack; the second support is positioned on the upper side of the circuit board and connected with the circuit board, and the second support is detachably connected with the first support.

Optionally, the positive terminal of the cell assembly and the negative terminal of the cell assembly are located on the same side.

Optionally, the first bracket comprises: a guide part for guiding the second bracket to be coupled to the first bracket in a second direction.

Optionally, the circuit board is detachably connected to the second bracket.

Optionally, the second bracket comprises:

a communication terminal part for supporting the battery pack communication terminal;

a connection part detachably connected with the circuit board, the connection part forming an open area to encapsulate the circuit board.

Optionally, the circuit board is formed with a first area and a second area, and the first area accommodates a larger number of electronic components than the second area.

Optionally, the first bracket further comprises: the positive terminal part is used for accommodating the positive terminal of the battery pack; the negative terminal part is used for accommodating the negative terminal of the battery pack; the positive terminal part and the negative terminal part are positioned on two sides of the guide part.

Optionally, the method further comprises: the cover plate is connected with the lower shell; the cover plate and the lower shell form an accommodating space for accommodating the electric core assembly; the cover plate is used for fixing the first bracket.

Optionally, a receiving space is formed between the cover plate and the first bracket to receive a portion of the circuit board.

Alternatively, the positive terminal portion may accommodate a plurality of positive terminals; the negative terminal portion can accommodate a plurality of negative terminals.

A power tool, comprising: the tool comprises a tool main body, a tool interface and a tool matching part, wherein the tool interface and the tool matching part are arranged on the tool main body; the battery pack is provided with a battery pack interface and a battery pack combining part, the battery pack interface is configured to be matched with the tool interface to supply power to the electric tool, and the battery pack combining part can be detachably connected with the tool matching part; the battery pack further includes: a housing comprising an upper housing and a lower housing assembled at an interface to form an internal cavity; an electrical core assembly disposed within the internal cavity; the battery cell assembly comprises a plurality of battery cell units; the battery pack interface is at least electrically connected with the electric core assembly; a circuit board connected in series between the battery pack assembly and the battery pack interface; wherein, the electric core subassembly includes: a plurality of non-cylindrical cell units; the positive terminal of the battery core assembly is connected with at least the positive electrode of the battery cell unit; and a cell assembly negative terminal connected to at least the negative electrode of the cell unit; the battery pack interface includes: the battery pack positive terminal is connected with the battery core component positive terminal; the battery pack negative terminal is connected with the battery core component negative terminal; the first bracket is positioned on the upper side of the lower shell and used for fixing the positive terminal of the battery pack and the negative terminal of the battery pack; the second support is positioned on the upper side of the circuit board to be connected with the circuit board, and the second support is detachably connected with the first support.

Optionally, the first bracket comprises:

a guide part for guiding the second bracket to be coupled to the first bracket in a second direction.

Optionally, the circuit board is detachably connected to the second bracket.

Optionally, the second bracket comprises:

The battery pack has the advantages that by adopting the technical scheme, the battery pack can be conveniently maintained, and the use cost of the battery pack is obviously reduced.

Drawings

Fig. 1 is a structural view of a battery pack;

fig. 2 is a structural view of a battery pack as one of the embodiments;

fig. 3 is a schematic view of the internal structure of the battery pack shown in fig. 1 with the case removed;

fig. 4 is a schematic view of a second bracket of the battery pack coupled to a first bracket;

FIG. 5 is a schematic view of another angled configuration of the second bracket and circuit board shown in FIG. 4;

fig. 6 is a schematic view of a second holder and a circuit board as one of the embodiments;

FIG. 7 is a schematic view of the battery pack of FIG. 1 with the housing removed from the battery pack at another angle;

FIG. 8 is a second bracket mounting schematic view of the battery pack of FIG. 3 with the first bracket removed;

fig. 9 is a schematic view of the battery pack of fig. 3 with the first bracket removed;

FIG. 10 is a plan view of a current sensor according to one embodiment in positional relationship with a positive electrode tab or a negative electrode tab;

FIG. 11 is a side view of a current sensor in positional relationship with a positive electrode connecting piece or a negative electrode connecting piece as one of the embodiments;

FIG. 12 is a schematic view of a projection of a positive electrode connecting piece, a negative electrode connecting piece, and a circuit board in the up-down direction as one of the embodiments;

fig. 13 is a structural view of a battery pack as one of the embodiments;

fig. 14 is a schematic structural view of a battery pack and an electric power tool using the battery pack;

fig. 15 is a schematic structural view of the electric power tool in fig. 14.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

As shown in fig. 1 to 2, the battery pack 100 includes a housing 10, a battery pack assembly 11, and a battery pack interface 12. The voltage of the battery pack 100 is typically 10.8V, 24V, 36V, 48V, 56V, or 80V. For convenience of explanation of the technical solution of the present invention, a front side, a rear side, a left side, a right side, an upper side and a lower side as shown in fig. 1 are also defined.

The housing 10 includes an upper housing 101 and a lower housing 102 assembled at an interface to form an internal cavity. The housing 10 is composed of a first material, specifically, a thermoplastic material, such as polyethylene plastic, polyvinyl chloride plastic, and the like. The housing 10 is assembled by an upper housing 101 and a lower housing 102 to form an inner cavity to accommodate the core assembly 11. The housing 10 is at least partially formed with a battery pack coupling portion 13 for coupling the battery pack 100 to the power tool, the battery pack 100 being connectable to the power tool in the first direction. Specifically, a battery pack coupling portion 13 is formed on the upper surface of the housing 10, and the battery pack coupling portion 13 is capable of mating with a tool fitting portion of the electric power tool, so that the battery pack 100 is detachably attached to the electric power tool in the mounting direction. In some embodiments, the battery pack engaging portion 13 is provided with a pair of guide rails.

The electric core assembly 11 is disposed in an inner cavity formed by the housing 10. The battery cell assembly 11 includes a plurality of non-cylindrical battery cell units 111, and the plurality of battery cell units 111 are connected in series, in parallel, or in combination of series connection and parallel connection to form the battery cell assembly 11. In some embodiments, the voltage of a single cell unit 111 is 4.2V. The cell assembly 11 further includes a cell assembly positive terminal 112 and a cell assembly negative terminal 113. The positive terminal 112 of the cell component is at least connected with the positive electrode of the cell unit; the cell assembly negative terminal 113 is connected to at least the cell unit negative electrode. The core assembly positive terminal 112 and the core assembly negative terminal 113 are located on the same side of the battery pack 100. Specifically, the cell unit positive electrode and the cell unit negative electrode are located on the same side of the battery pack 100. In some embodiments, the cell unit positive electrode and the cell unit negative electrode are located on a front side end face of the battery pack 100, and in other embodiments, the cell unit positive electrode and the cell unit negative electrode are located on a rear side end face of the battery pack 100. In some embodiments, the cell units 111 are in a flat bag-shaped structure, the plurality of cell units 111 are stacked and arranged in a sequence along the up-down direction, and the cell units 111 may also be bent into an arc shape, for example, a soft-package battery pack. The cell unit 111 further includes a cell casing, which is generally made of an aluminum plastic film. It is to be understood that the present application is not limited to the disclosed embodiments, and the structure of the cell is not limited thereto.

In some embodiments, the energy density (energy/mass of the battery pack) of the electric core assembly 11 is greater than 150 Wh/kg. Optionally, the energy density (energy/mass of the battery pack) of the electric core assembly 11 is greater than 200 Wh/kg. Optionally, the energy density (energy/mass of the battery pack) of the electric core assembly 11 ranges from 150Wh/kg to 200 Wh/kg. Optionally, the energy density (energy/mass of the battery pack) of the electric core assembly 11 ranges from 200Wh/kg to 250 Wh/kg. Optionally, the energy density (energy/mass of the battery pack) of the electric core assembly 11 ranges from 250Wh/kg to 300 Wh/kg. Optionally, the energy density (energy/mass of the battery pack) of the electric core assembly 11 ranges from 300Wh/kg to 450 Wh/kg.

In some embodiments, the internal cell resistance of the battery pack 100 is less than or equal to 10m Ω. Optionally, the internal resistance of the battery cell of the battery pack 100 is less than or equal to 6m Ω. Optionally, the internal resistance of the battery cell of the battery pack 100 is less than or equal to 3m Ω.

In some embodiments, the discharge current of the battery pack 100 is 80A or greater. Optionally, the discharge current of the battery pack 100 is greater than or equal to 100A. Optionally, the discharge current of the battery pack 100 is greater than or equal to 80A.

A battery pack interface 12 is formed on an upper surface of the housing 10 and is electrically connected to at least the electric core assembly 11 for establishing physical and electrical connection with the electric tool. The battery pack interface 12 includes a power supply positive interface, a power supply negative interface, and a power supply communication interface. The battery pack outputs electric energy through the positive power interface and the negative power interface; the battery pack communicates with an attached power tool or charger through a power communication interface. In one particular embodiment, the housing is provided with 6 battery pack interfaces 12, it being understood that the housing 10 of the battery pack 100 may be provided with more or less battery pack interfaces 12 depending on the electrical characteristics of the battery pack.

Also disposed within the battery pack interface 12 are a battery pack positive terminal 121, a battery pack negative terminal 122, and a battery pack communication terminal 123. Wherein, the battery pack positive terminal 121 is electrically connected with the electric core component positive terminal 112, which is positioned in the power supply positive interface; the negative terminal 122 of the battery pack is electrically connected to the negative terminal 113 of the battery cell assembly, which is located in the negative interface of the power supply. The battery pack positive terminal 121 and the battery pack negative terminal 122 are configured to cooperate with a tool terminal of the power tool to output the electric power of the battery pack 11 to the power tool, and specifically, the electric power of the battery pack 11 passes through the battery pack positive terminal 112, the battery pack positive terminal 121 to the power tool, and then returns to the battery pack 11 through the battery pack negative terminal 122 and the battery pack negative terminal 113, and thus, the battery pack 11, the battery pack positive terminal 112, the battery pack positive terminal 121, the battery pack negative terminal 122, the battery pack negative terminal 113, and the power tool form a current loop. In addition, a battery pack communication terminal 123, which is located in the power supply communication interface, is used for communicating with the accessed electric power tool or charger. As an embodiment of a specific structure of the battery pack positive terminal 121, the battery pack negative terminal 122, and the communication terminal 123, the battery pack positive terminal 121, the battery pack negative terminal 122, and the communication terminal 123 respectively clamp the tool terminals by elastic force from both sides in the left-right direction, and therefore, the tool terminals of the electric power tool are guided by the battery pack interface 12 of the battery pack to be inserted into the battery pack positive terminal 121 and the battery pack negative terminal 122 during the installation of the battery pack to the electric power tool, so that the tool terminals are clamped by the positive terminal and the negative terminal, thereby electrically connecting the electric power tool to the battery pack 100.

In some embodiments, the cell assembly positive terminal 112 is connected in series between at least one cell unit positive electrode and the pack positive terminal 121; the cell assembly negative terminal 113 is connected in series between at least one cell unit negative and the pack negative terminal 122. The electric core assembly 11 further includes: a positive electrode lead-out sheet 114 and a negative electrode lead-out sheet 115, wherein the positive electrode lead-out sheet 114 connects the positive electrode terminal 112 of the cell assembly with the positive electrode of the cell unit, and the negative electrode lead-out sheet 115 connects the negative electrode terminal 113 of the cell assembly with the negative electrode of the cell unit. In order to prevent the temperature of the positive electrode tab 114 from rapidly increasing when the battery pack 100 outputs a large discharge current, the positive electrode tab 114 is a metal sheet having a certain width, so that the heat dissipation effect of the positive electrode tab 114 is improved, the heat generated by the battery pack 100 during use is reduced, the safety and reliability of the battery pack 100 are improved, and the service life of the battery pack 100 is also prolonged. Specifically, the width of the positive electrode tab 114 is in the interval of 5mm to 40mm, and the thickness of the positive electrode tab 114 is in the interval of 0.3mm to 1.5 mm. Optionally, the width of the positive electrode tab 114 is in the interval of 6mm to 35 mm.

In other embodiments, the negative connection tab 115 of the battery pack 100 is made of a metal sheet with a certain width to improve the heat dissipation effect of the negative lead-out tab 115, thereby reducing the heat accumulation of the battery pack 100 during the use process, improving the safety and reliability of the battery pack 100, and prolonging the service life of the battery pack 100. The width of the negative electrode tab 115 is within a range of 5mm to 40mm and the thickness of the negative electrode tab 115 is within a range of 0.3mm to 1.5 mm. Optionally, the width of the negative electrode tab 115 is in the interval of 6mm to 35 mm. It is understood that, in order to improve the heat dissipation effect, the positive electrode tab 114 and the negative electrode tab 115 of the battery pack 100 may simultaneously use metal sheets having a certain width. In the present embodiment, since the positive terminal 112 and the negative terminal 113 of the cell assembly are located on the same side of the battery pack 100, and the plurality of cell units 111 included in the cell assembly 11 are connected in series, the lengths of the positive lead sheet 114 and the negative lead sheet 115 are different.

Referring to fig. 3, the cell assembly 11 further includes cell connection pieces 116, and the cell connection pieces 116 connect the adjacent cell units 111. Specifically, the cell connecting pieces 116 connect one cell unit positive electrode and the other cell unit negative electrode, and the cell assembly 11 includes a plurality of cell connecting pieces 116 to realize the series connection of the cell units 111. In addition, the width of the cell connecting sheet 116 is the same as the width of the positive electrode lead-out sheet 114 and/or the width of the negative electrode lead-out sheet 115, so that the heat dissipation effect of the cell connecting sheet 116 is improved, the heat accumulation of the battery pack 100 in the use process is reduced, the safety and the reliability of the battery pack 100 are improved, and the service life of the battery pack is prolonged. In a specific embodiment, the battery cell assembly 11 includes at least a first battery cell and a second battery cell, and the first battery cell and the second battery cell are connected in series, wherein the negative electrode of the first battery cell is electrically connected to the negative lead-out sheet 115, and the positive electrode of the second battery cell is electrically connected to the positive lead-out sheet 114. Correspondingly, the cell assembly 11 further includes at least one cell connection tab 116 that connects the positive electrode of the first cell and the negative electrode of the second cell to enable series connection of the first cell and the second cell.

As shown in fig. 3 to 4, the battery pack further includes a cover plate 14, a circuit board 15, a first bracket 16, and a second bracket 17.

Wherein, the cover plate 14 is connected with the battery pack lower case 102, and forms an accommodating space with the lower case 102 to accommodate the battery pack assembly 11. In some embodiments, the cover plate 14 and the lower battery pack case 102 are detachably connected by bolts to form a receiving space to receive the battery pack assembly 11. Similarly, the cover 14 and the upper case 101 form an accommodating space for accommodating the positive terminal 121, the negative terminal 122 and the communication terminal 123 of the battery pack. Specifically, the cover plate 14 has a flat plate-like structure.

The circuit board 15 is electrically connected with the electric core assembly 11 and the battery pack interface 12. Specifically, the circuit board 15 is connected in series between the battery pack assembly 11 and the battery pack interface 12 for collecting electrical signals related to the battery pack. In this embodiment, in some embodiments, the circuit board 15 is connected in series between the battery pack assembly 11 and the battery pack communication terminal 123 for transmitting battery pack information to the power tool attached to the battery pack through the battery pack communication terminal 123. The battery pack information includes: the discharge current of the battery pack, the temperature of the cell assembly 11 and/or the cell unit 111, the voltage of the cell unit 111, the internal resistance value of the cell unit 111, and the like.

The first bracket 16 is located at an upper side of the lower case 102 for fixing the pack positive terminal 121 and the pack negative terminal 122. Specifically, the first bracket 16 is located in the accommodating space formed by the cover plate 14 and the upper case 101 of the battery pack, i.e., the first bracket 16 is located on the upper side of the cover plate 14. Therefore, the first bracket 16 serves to fix the positive and negative terminals 121 and 122 of the battery pack at predetermined positions on the upper side of the cap plate 14. The first holder 16 includes a flat plate portion fixed to the upper surface of the lid plate 14, and the battery pack positive terminal 121 and the battery pack negative terminal 122 are fixed to the flat plate portion in an exposed state. Specifically, the first bracket 16 further includes a positive terminal portion 161 and a negative terminal portion 162, the positive terminal portion 161 being configured to receive the positive terminal 121 of the battery pack, and the negative terminal portion 162 being configured to receive the negative terminal 122 of the battery pack. In some embodiments, the positive terminal portion 161 and the negative terminal portion 162 are structures having at least one end opened in the battery pack mounting direction, so that when the battery pack 100 is coupled to the power tool, the battery pack positive terminal 121 and the battery pack negative terminal 122 can receive tool terminals to electrically connect the battery pack and the power tool to output electric power of the battery pack 100 to the power tool.

And a second bracket 17 positioned at an upper side of the circuit board 15 to fix the circuit board 15. Specifically, the second bracket 17 and the circuit board 15 are located on the upper side of the cover plate 14, that is, the second bracket 17 and the circuit board 15 are located in the accommodating space formed by the cover plate 14 and the battery pack upper case. The second bracket 17 is also used to fix the battery pack communication terminal 123. Therefore, the second bracket 17 includes a communication terminal portion 171 for supporting the battery pack communication terminal 123. In addition, the second bracket 17 further includes a connecting portion 172, and the connecting portion 172 is a square frame and is detachably connected to the circuit board 15, so that the second bracket 17 is detachably connected to the circuit board 15. The connection portion 172 is formed with an open area to enclose the circuit board 15, so that, as shown in fig. 5, the circuit board 15 can be divided into two areas by the square frame of the connection portion 172, defining the area of the circuit board 15 inside the connection portion 172 as a first area 151, and the area of the circuit board 15 outside the connection portion 172 as a second area 152. Therefore, in order to improve the waterproof performance of the battery pack, as many electronic components as possible are packaged in the first region 151, the number of electronic components accommodated in the first region 151 is greater than the number of electronic components accommodated in the second region 152. The connection part 172 facilitates subsequent encapsulation of electronic components inside the connection part 172, namely, electronic components in the first region 151 of the circuit board 15, by means of gluing, so that the waterproof performance of the circuit board 15 is improved, and the reliability of the battery pack is improved.

In the event of a failure of the circuit board 15, in order to facilitate maintenance to extend the life of the battery pack, thereby reducing the use cost of the battery pack, the circuit board 15 can be detached from the battery pack for repair, and therefore, the second bracket 17 is configured to be detachably connected to the first bracket 16, thereby detachably connecting the circuit board 15 to the first bracket 16. When the circuit board 15 breaks down, the second bracket 17 takes the circuit board 15 to detach from the first bracket 16, so that the circuit board 15 is separated from the battery pack, and the circuit board 15 is convenient to maintain. The following detailed description will be given with reference to the embodiments.

In some embodiments, the first bracket 16 further includes a guide portion 163 for guiding the second bracket 17 to be coupled to the first bracket 16 in the second direction. In some embodiments, the positive terminal portion 161 and the negative terminal portion 162 of the first bracket 16 are located at both sides of the guide portion 163. A band plate shape extending in the second direction is formed on both left and right sides of the guide portion 163, and stands at right angles to the cover plate 14. The left and right strip-shaped spaces of the guide portion 163 are formed to fit the communication terminal portions 171 of the second bracket 17, and specifically, the communication terminal portions 171 are slidably coupled to the first bracket 16 along the left and right strip-shaped spaces of the guide portion 163, and the guide portion 163 can accommodate the communication terminal portions 171. In other embodiments, the positive terminal portion 161 and the negative terminal portion 162 of the first bracket 16 are disposed adjacent to each other, and the guide portion 163 is disposed adjacent to the positive terminal portion 161 or the negative terminal portion 162, and accordingly, the position where the communication terminal portion 171 of the second bracket 17 is disposed is adapted to the guide portion 163 so that the guide portion 163 can be fitted to the communication terminal portion 171 when the second bracket 17 is coupled to the first bracket 16.

In some embodiments, the first bracket 16 further includes a base 164, the base 164 being a component for securing the first bracket 16 to the cover 14 in a predetermined position. The base 164 allows the first bracket 16 and the cover plate 14 to form a receiving space therebetween for receiving a portion of the circuit board 15, so that the overall structure of the first bracket 16, the second bracket 17 and the circuit board 15 is more compact, and the size of the battery pack is reduced. In addition, a plurality of limiting parts are further arranged on the cover plate 14, so that the second support 17 can be conveniently guided to be combined with the first support 16 along the second direction, meanwhile, the circuit board 15 is more stably arranged, and the anti-seismic performance of the battery pack is improved. Specifically, referring to fig. 3, the cover plate 14 is further provided with a first limiting portion 141, a second limiting portion 142 and a third limiting portion 143. Wherein, the first and second limiting

portions

141 and 142 are positioned at the left and right sides of the circuit board 15 to assist the guide portion 163 of the first bracket 16 to guide the second bracket 17 to be coupled to the first bracket 16 along the second direction. Meanwhile, the first and second

defining parts

141 and 142 assist the guide part 163 to combine the circuit board 15 to the receiving space formed by the first bracket 16 and the cover plate 14 in the second direction, so that the arrangement of the circuit board 15 is more stable without moving left and right with the vibration of the battery pack after the second bracket 17 is combined to the first bracket 16 and the circuit board 15 is combined to the receiving space between the first bracket 16 and the cover plate 14. In some embodiments, the cover plate 14 is further provided with a third limiting portion 143, and the third limiting portion 143 is located at the lower side of the circuit board 15, so that the circuit board 15 can be stably arranged without moving up and down with the vibration of the battery pack after the second bracket 17 is coupled to the first bracket 16 and the circuit board 15 is coupled to the accommodating space between the first bracket 16 and the cover plate 14.

Referring to fig. 6, which is a schematic view of the second bracket 17 and the circuit board 15, the second bracket 17 further includes a plurality of latches 173, specifically, a plurality of protrusions extend downward from the second bracket 17 to form the latches 173, and a plurality of slots 153 are disposed on the circuit board 15 corresponding to the latches 173. Therefore, the second bracket 17 and the circuit board 15 are detachably connected by the cooperation of the snap 173 and the card slot 153. In some embodiments, the height of the catch 173 is the same as the thickness of the circuit board 15; in other embodiments, the height of the latch 173 is greater than the thickness of the circuit board 15, and after the second bracket 17 is connected to the circuit board 15, the latch 173 protrudes from the lower surface of the circuit board 15 and abuts against the cover plate 14, so that the latch 173 corresponds to the third limiting portion 143, and after the second bracket 17 is combined to the first bracket 16 and the circuit board 15 is combined to the accommodating space between the first bracket 16 and the cover plate 14, the circuit board 15 is more stably arranged and cannot move up and down with the vibration of the battery pack.

The battery pack further includes a detection sensor for detecting an operating parameter of the core assembly 11 or the cell unit 111 and transmitting the operating parameter to the circuit board 15. The number of detection sensors may be one or more. In some embodiments, the detection sensor may be a temperature sensor disposed on a surface of the cell assembly 11 or a surface of the cell unit 111, and the temperature sensor is connected to the circuit board 15 to transmit temperature information of the cell assembly 11 to the circuit board 15. In some embodiments, the detection sensor may be a voltage sensor for detecting the voltage of the cell unit 111, and the voltage sensor is connected to the circuit board 15 to transmit the temperature information of the cell assembly 11 to the circuit board 15. In some embodiments, the battery pack includes a temperature sensor, a voltage sensor and a detection circuit board 18, and the temperature sensor and the voltage sensor are integrated on the detection circuit board 18, and the detection circuit board 18 is disposed at one side of the positive terminal of the electric core assembly 11 and the negative terminal of the electric core assembly 11 for the convenience of detection. Meanwhile, in order to save space and improve reliability of the battery pack, the detection circuit board 18 may also be a flexible circuit board (FPC) that is bendable. It will be appreciated that the battery pack may also include other types of sensors such that the circuit board 15 may collect information from the battery pack via various sensors and transmit it to an attached power tool or charger via the battery pack communication terminals 123.

Referring to fig. 7, the battery pack 100 further includes a sensing line output socket 181, the sensing line output socket 181 is connected with a sensor connection line 182, and the sensor connection line 182 is electrically connected to the circuit board 15 through the sensing line output socket 181. The sensor connection line 182 is connected to the detection sensor on the detection circuit board 18 to output a sensor signal to the circuit board 15. To facilitate the detachable connection of the circuit board 15 and the battery pack, the sensing wire output socket 181 is detachably connected to the circuit board 15, thereby allowing the sensor connection wire 182 to be detachably connected to the circuit board 15. Accordingly, in some embodiments, the sensing wire output socket 181 and the second bracket 17 are detachably connected. Specifically, the sensor connecting line 182 adopts the wiring harness to arrange to insert and connect at detection line output socket 181, is provided with socket adaptation structure on the second support 17 for detection line output socket 181 and second support 17 can dismantle the connection. In other embodiments, the number of the test line output sockets 181 may be multiple, and the second bracket 17 is provided with socket adapting structures matching the number of the test line output sockets 181. In this embodiment, the battery pack includes a first detection line output socket and a second detection line output socket, the first detection line output socket and the second detection line output socket are located at two sides of the power display switch, and are respectively connected with 6 sensor connection lines 182 in an inserting manner, it can be understood that the number of the detection line output sockets 181 can be 1, and the sensor connection lines 182 with different numbers can be connected in an inserting manner, wherein the number of the sensor connection lines 182 can be set according to the number of the detection sensors, and there is no limitation here.

As shown in fig. 7, a plurality of sensor connecting wires 182 are inserted into the detection line output socket 181 in a wire harness arrangement manner, and since the respective sensor connecting wires are arranged relatively close to each other, when the sensor connecting wires are plugged in and pulled out, the two adjacent sensor connecting wires are easy to contact with each other to cause short circuit, so that the detection circuit board or even the battery cell is damaged, and therefore, the series resistor is connected to each sensor connecting wire, so that the current generated when the two adjacent sensor connecting wires are short-circuited can be limited, and the detection circuit board and the battery cell are protected.

Referring to fig. 3, 8 and 9, the battery pack further includes a connecting piece 19. Specifically, the battery pack 100 includes a positive electrode connecting piece 19A and a negative electrode connecting piece 19B. The positive connecting piece 19A is connected in series between the positive terminal 121 of the battery pack and the positive terminal 112 of the electric core assembly, and the negative connecting piece 19B is connected in series between the negative terminal 122 of the battery pack and the negative terminal 113 of the electric core assembly. In one particular embodiment, the negative connector tab 19B is disposed on the underside of the negative terminal 122 of the battery pack, with a portion of the negative connector tab 19B being positioned between the circuit board 15 and the negative terminal 122 of the battery pack. Specifically, the negative connecting piece 19B is located in the accommodating space formed between the negative terminal 122 of the battery pack and the lid plate 14, and similarly, the positive connecting piece 19A is located in the accommodating space formed between the positive terminal 121 of the battery pack and the lid plate 14.

The battery pack 100 further includes a current sensor 193 provided on the circuit board 15 at a position where a current flowing through the positive electrode tab 19A or the negative electrode tab 19B can be sensed to detect an input current or an output current of the battery pack. The current sensor 193 is usually disposed on a side close to the positive electrode connection piece 19A or the negative electrode connection piece 19B and at a position where it can sense the magnetic field of the positive electrode connection piece 19A or the negative electrode connection piece 19B. Specifically, the current sensor 193 is disposed below the positive electrode connection piece 19A or the negative electrode connection piece 19B, and the current sensor 193 is disposed at a spatial interval from the positive electrode connection piece 19A or the negative electrode connection piece 19B.

In some embodiments, referring to the top view of fig. 10 showing the positional relationship between the current sensor 193 and the positive tab 19A or the negative tab 19B, the current sensor 193 is disposed near the edge of the positive tab 19A or the negative tab 19B to sense the current flowing through the positive tab 19A or the negative tab 19B. The size and shape of the circuit board on which the current sensor 193 is located may be set accordingly according to the location of the current sensor 193, and in addition, the battery pack may also include a plurality of circuit boards accordingly such that the current sensor 193 is located near the edge of the positive electrode tab 19A or the negative electrode tab 19B.

In other embodiments, referring to the side view of fig. 11 showing the positional relationship between the current sensor 193 and the positive connecting piece 19A or the negative connecting piece 19B, the current sensor 193 is disposed near the outer surface of the positive connecting piece 19A or the negative connecting piece 19B, and further, the current sensor 193 is disposed near the lower surface of the positive connecting piece 19A or the negative connecting piece 19B so as to sense the current flowing through the positive connecting piece 19A or the negative connecting piece 19B. Referring to fig. 12, in the present embodiment, the circuit board 15 is defined to have the third area 154 formed, and a projection plane of the third area 154 in the vertical direction coincides with a projection plane of the positive connection piece 19A and/or the negative connection piece 19B in the vertical direction. The current sensor 193 is disposed in the second region 152 on the circuit board 15, further the current sensor 193 is disposed in the third region 154 on the circuit board 15, and further the current sensor 193 is disposed in the third region 154 on the circuit board 15 near the center of the third region 154 to receive more magnetic field around the positive or negative connecting

tab

19A or 19B to more accurately sense the current flowing through the positive or negative connecting

tab

19A or 19B. In the present embodiment, the positive electrode tab 19A includes a positive electrode current detector 191, the negative electrode tab 19B includes a negative electrode current detector 192, the positive electrode current detector 191 and the negative electrode current detector 192 are disposed in parallel with the circuit board 15, and the current sensor 193 is disposed below the positive electrode current detector 191 or the negative electrode current detector 192.

The current sensor 193 is a chip-type current sensor, and can perform non-contact current sampling, so that the discharging current or the charging current of the battery pack 100 is directly output to the electric tool through the battery pack positive terminal 121 and the battery pack negative terminal 122 without passing through the circuit board 15. Thus, a large amount of heat generated by the positive terminal 121 and the negative terminal 122 of the battery pack can be prevented from being conducted to the circuit board 15, and the heat generation of the circuit board 15 is reduced, so that the heat generation of the battery pack 100 is reduced, the safety of the circuit board 15 is improved, and the reliability of the battery pack 100 is improved. The positive connecting piece 19A and the negative connecting piece 19B are made of metal, and the current sensor 193 may be a hall sensor.

The battery pack 100 also includes a cell support 117, the cell support 117 configured to support the cell assembly 11, the cell support 117 having a second material that is different from the first material, in some embodiments, the second material is a thermoset material, and the housing 11 has a first material that is a thermoplastic material. Further, the hardness of the second material is different from the hardness of the first material, and in some embodiments, the hardness of the second material is less than the hardness of the first material, so that a housing with a higher hardness can better protect the electrical core assembly 11. Cell support members 117 are disposed at least at two ends of the cell assembly 11, and at least a portion of the cell support members 117 encapsulate the cell unit positive electrode and the cell unit negative electrode. Thus, the second material may be an insulating material that is capable of insulating when the cell support 117 encapsulates the cell unit positive electrode and the cell unit negative electrode, preventing electrical leakage.

In some embodiments, the cell support 117 includes a first support and a second support, the first support is located on a front end surface of the cell assembly 11, and the front end surface is a surface on which the positive pole of the cell core unit 111 and the negative pole of the cell unit are arranged on the cell assembly 11. The second supporting member is located on the rear end face of the electric core assembly 11, and the rear end face and the front end face are opposite to each other. Further, the cell support 117 fixes and covers the cell unit positive electrode, the cell unit negative electrode, the positive electrode tab 114, and the negative electrode tab 115. In the present embodiment, referring to fig. 13, the cell supports 117 extend from the front end surface and the rear end surface of the cell assembly 11 to the left side surface, the right side surface and the lower surface of the cell assembly 11, and are disposed around the front end surface, the rear end surface, the left side surface, the right side surface and the lower bottom surface of the cell assembly 11 to form an upper open accommodation space for accommodating the cell assembly 11. Specifically, the cell assembly 11 is placed in a mold, supporting members are formed on the front end face, the rear end face, the left side face, the right side face and the lower surface of the cell assembly 11 in a glue injection manner, and then the cell assembly 11 and the molded cell supporting members 117 are taken out as a whole.

In this way, the cell support member 117 is used to support the cell assembly 11, so as to prevent the cell units 111 from being displaced relative to each other due to bumping or vibration, thereby preventing the cell from being squeezed or twisted. Therefore, the cell support 117 can improve the anti-falling and shock-absorbing performance of the battery pack, thereby improving the reliability of the battery pack.

In some embodiments, a buffer layer is disposed between the cell units 111, and the buffer layer is made of the second material. A buffer layer is provided between the adjacent cell units 111. Set up the buffer layer between electric core unit 111 and help improving the anti-falling shock attenuation performance of battery package, and then improve the reliability of battery package.

The battery pack 100 of the present invention is adapted to the electric power tool 200, and the battery pack 100 is detachably attached to the electric power tool 200. As shown in fig. 14 to 15, the power tool 200 is an impact wrench. While the present embodiment relates to an impact wrench, it should be understood that the present application is not limited to the disclosed embodiments, but may be applied to other types of power tools, such as garden-type tools like lawn mowers, pruners, blowers, chain saws; the tool may be a torque output tool such as an electric drill or an electric hammer, a saw cutting tool such as an electric circular saw, a jig saw or a reciprocating saw, or a grinding tool such as an angle grinder or a sander.

The electric power tool 200 includes a tool body 21, and a tool interface 22 and a tool engagement portion 23 provided on the tool body 21. The tool main body 21 includes a motor 211, an output shaft 212, and an impact mechanism 213. The output shaft 212 is driven by the motor 211, the impact mechanism 213 connects the motor 211 and the output shaft 212, and the impact mechanism 213 is driven by the motor 211 and applies an impact force to the output shaft 212. The power tool 200 also includes a handle 214, which handle 214 may be held by a user to operate the power tool. A trigger switch 215 is also provided on the handle 214, the trigger switch 215 being adapted to be actuated by a user to start or stop operation of the motor 211. The tool interface 22 is configured to adapt the battery pack interface 12 to access the battery pack 100 to power the power tool 200. In addition, a tool engaging portion 23 is detachably connected to the battery pack coupling portion 13, and in some embodiments, the tool engaging portion 23 is disposed at a lower end of the power tool handle 214 for detachably connecting to the battery pack 100. Generally, the battery pack coupling portion 13 is provided with a pair of sliding portions having an inverted L-shaped cross section. Accordingly, the slide portion can slide along the tool fitting portion 23 of the handle bottom portion to be mounted to the tool main body 21 through the tool fitting portion 23, and the tool fitting portion 23 may be provided as a pair of guide rails. Specifically, when the user slides the battery pack toward the front of the tool main body 21, the battery pack 100 may be connected thereto.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above-described embodiments are not intended to limit the present invention in any way, and that the basic principles, essential features and advantages of the invention have been shown and described above with the aid of equivalents or equivalent arrangements.

Claims

1. A battery pack, comprising:

a housing comprising an upper housing and a lower housing assembled at an interface to form an internal cavity;

an electrical core assembly disposed within the internal cavity;

the battery pack interface is at least electrically connected with the electric core assembly;

a circuit board electrically connected with at least the battery pack assembly and the battery pack interface;

wherein, the electric core subassembly includes:

a plurality of cell units;

the positive terminal of the battery core assembly is connected with at least the positive electrode of the battery cell unit; and

the battery core assembly negative terminal is connected with at least the negative electrode of the battery cell unit;

the battery pack interface includes:

the battery pack positive terminal is connected with the battery core component positive terminal;

the battery pack negative terminal is connected with the battery core component negative terminal; and

a communication terminal of the battery pack,

the first bracket is positioned on the upper side of the lower shell and used for fixing the positive terminal of the battery pack and the negative terminal of the battery pack;

the second support is positioned on the upper side of the circuit board and connected with the circuit board, and the second support is detachably connected with the first support.

2. The battery pack according to claim 1,

the positive terminal of the battery pack and the negative terminal of the battery pack are positioned on the same side.

3. The battery pack according to claim 1,

the first bracket includes:

4. The battery pack according to claim 1,

the circuit board is detachably connected with the second support.

5. The battery pack according to claim 1,

the second bracket includes:

6. The battery pack according to claim 1,

the circuit board is provided with a first area and a second area, and the number of electronic components contained in the first area is larger than that of the electronic components in the second area.

7. The battery pack according to claim 3,

the first bracket further includes:

the positive terminal part is used for accommodating the positive terminal of the battery pack;

the negative terminal part is used for accommodating the negative terminal of the battery pack;

the positive terminal part and the negative terminal part are positioned on two sides of the guide part.

8. The battery pack according to claim 1,

further comprising: the cover plate is connected with the lower shell;

the cover plate and the lower shell form an accommodating space for accommodating the electric core assembly;

the cover plate is used for fixing the first bracket.

9. The battery pack according to claim 8,

an accommodating space is formed between the cover plate and the first bracket to accommodate part of the circuit board.

10. The battery pack according to claim 7,

the positive terminal part can accommodate a plurality of positive terminals;

the negative terminal portion can accommodate a plurality of negative terminals.

11. A power tool, comprising:

the tool comprises a tool main body, a tool interface and a tool matching part, wherein the tool interface and the tool matching part are arranged on the tool main body;

the battery pack is provided with a battery pack interface and a battery pack combining part, the battery pack interface is configured to be matched with the tool interface to supply power to the electric tool, and the battery pack combining part can be detachably connected with the tool matching part; the battery pack further includes: