WO2022001953A1

WO2022001953A1 - Battery pack with self-discharge function and electric tool

Info

Publication number: WO2022001953A1
Application number: PCT/CN2021/102747
Authority: WO
Inventors: 沈海明
Original assignee: 苏州英途康医疗科技有限公司
Priority date: 2020-07-03
Filing date: 2021-06-28
Publication date: 2022-01-06

Abstract

A battery pack with a self-discharge function and an electric tool. The battery pack comprises a battery box (110), a self-discharge unit (120), and a battery cover (130). The self-discharge unit (120) comprises a self-discharge switch (121). The self-discharge switch (121) is used for controlling whether the self-discharge unit (120) performs discharge work or not. A battery cell (140) is provided in the battery box (130). The positive electrode end of the battery cell (140) is connected to one end of the self-discharge unit (120), and the negative electrode end of the battery cell (140) is connected to the other end of the self-discharge unit (120) by means of the battery cover (130). When the battery cover (130) is inserted into the battery box (110), the self-discharge switch (121) is in an off state to prohibit the self-discharge unit (120) from discharging. When the battery box (110) is pulled out of an electric tool and is not inserted with the battery cover (130), the self-discharge switch (121) is switched on, so that the self-discharge unit (120) performs discharge work. The battery pack has the beneficial effects that when the battery pack is discarded, the battery cell (140) in the battery pack can be subjected to self-discharging, so that safety accidents caused by sufficient electric quantity of the discarded battery cell (140) are avoided.

Description

Battery packs, power tools with self-discharge function

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and claims the priority of Chinese Patent Application No. 202010635825.6 filed on July 3, 2020, entitled "Battery pack with self-discharge function, electric tool", and filed on July 3, 2020, titled The priority of Chinese Patent Application No. 202021285610.8 for "Battery pack and electric tool with self-discharge function" is hereby cited in its entirety as a part of the present application.

technical field

The present disclosure relates to the technical field of batteries, and in particular, to a battery pack with a self-discharge function and an electric tool.

Background technique

Batteries are widely used in modern social life because of their characteristics of stable voltage, stable current, long-term stable power supply and stable and reliable performance. Stapler is a medical device that can replace traditional manual suture. Due to the development of modern technology and the improvement of manufacturing technology, the stapler used in clinic is of reliable quality and easy to use. It has the advantages of few side effects and surgical complications. Typically, staplers are single-use devices to avoid cross-contamination, and must be powered by batteries with full power to avoid suture interruptions due to insufficient power, or even unforeseen accidents. Therefore, in this type of power tool, the battery is a disposable product.

When the battery is used as a disposable product, most of the used batteries have residual power, for example, the residual power is 50%, and even higher than 70%. These batteries are usually discarded directly after use. However, due to the sufficient power in the batteries, when the positive and negative electrodes of these batteries are connected by conductive substances, a closed loop will be formed, which may cause the risk of accidental fire.

SUMMARY OF THE INVENTION

The present disclosure provides a battery pack and a power tool with a self-discharge function, which solve the technical problem that the risk of accidental fire may be caused when the power in the discarded battery is sufficient.

In order to achieve the above purpose, the main technical solutions adopted in the present disclosure include:

In a first aspect, an embodiment of the present disclosure provides a battery pack with a self-discharge function, including a battery box, a self-discharge unit and a battery cover, the self-discharge unit includes a self-discharge switch, and the self-discharge switch is used to control whether the self-discharge unit is discharged When working, there is a battery inside the battery box, the positive end of the battery is connected to one end of the self-discharge unit, the negative end of the battery is connected to the other end of the self-discharge unit through the battery cover, and the battery box self-discharges when the battery cover is inserted The switch is in an off state to prohibit the self-discharge unit from discharging work, and when the battery box is pulled out from the power tool and the battery cover is not inserted, the self-discharge switch is closed to enable the self-discharge unit to discharge.

The battery pack with self-discharge function proposed by the embodiments of the present disclosure includes a battery box, a self-discharge unit and a battery cover. The self-discharge unit further includes a self-discharge switch for controlling whether the self-discharge unit performs discharge work. The battery box is provided with a self-discharge switch. The positive terminal of the battery cell is connected to one end of the self-discharge unit, and the negative terminal of the battery cell is connected to the other end of the self-discharge unit through the battery cover. When the battery box is inserted with the battery cover, the self-discharge switch is in the off state. In order to prohibit the self-discharge unit from discharging, and when the battery box is pulled out from the power tool and the battery cover is not inserted, the self-discharge switch is closed, so that the self-discharge unit can discharge. Therefore, by setting the self-discharge unit, the battery box and the battery cover, and whether the self-discharge switch is disconnected or not is controlled by whether the battery box and the battery cover are plugged or not, and then control whether the self-discharge unit performs self-discharge work, so as to control whether the self-discharge switch is disconnected or not. To achieve the purpose of discharging the cells in the battery pack when the battery pack is no longer used or discarded, so as to reduce the power of the cells to a safe power range, thereby effectively avoiding the sufficient power of the discarded cells. resulting in safety incidents.

Optionally, the self-discharge switch is a normally-closed relay, and the self-discharge unit further includes a self-discharge resistor, wherein one end of the normally-closed switch in the normally-closed relay is connected to the positive terminal of the cell, and the normally-closed switch in the normally-closed relay is connected to the positive terminal of the cell. The other end is connected to the negative terminal of the battery cell through the self-discharge resistance, one end of the coil in the normally closed relay is connected to the positive terminal of the battery cell, the other end of the coil in the normally closed relay is connected to the discharge pin in the battery cover, and the battery The discharge pin in the cover is connected to the negative pin in the battery cover and then connected to the negative terminal of the cell. Therefore, the self-discharge function of the battery pack can be realized by the circuit formed by the normally closed relay and the self-discharge resistor, and the circuit structure is simple and the reliability is high.

Optionally, the battery pack with self-discharge function further includes an output control unit, one end of the output control unit is connected to the positive terminal of the battery cell, and the other end of the output control unit is connected to the battery cover, wherein the battery box is unplugged from the battery cover and When plugged into a power tool, the output control unit is closed so that the battery compartment can supply power to the power tool. Therefore, the output control unit is provided in the battery pack, and the output control unit is in a closed state when the battery pack is in use, so as to achieve the purpose of supplying power to the electric tool.

Optionally, the output control unit includes a normally open relay, one end of the normally open switch in the normally open relay is connected to the positive terminal of the battery cell, and the other end of the normally open switch in the normally open relay is connected to the positive terminal of the battery cover. , one end of the coil in the normally open relay is connected to the positive terminal of the battery cell, and the other end of the coil in the normally open relay is connected to the output control pin in the battery cover. Therefore, a power supply circuit can be formed through the normally open relay, so as to realize the power supply function of the battery pack, and the circuit structure is simple and the reliability is high.

Optionally, both the self-discharge unit and the output control unit are arranged in the battery box, and the battery box is respectively provided with a positive terminal, an output control terminal, a discharge terminal and a negative terminal, and the positive terminal is used to connect the positive pin in the battery cover, The output control terminal is used to connect to the output control pin in the battery cover, the discharge terminal is used to connect to the discharge pin in the battery cover, and the negative terminal is used to connect to the negative pin in the battery cover. Therefore, by arranging corresponding connection terminals on the battery box, it is convenient to realize the electrical connection inside the battery pack and between the inside and the outside of the battery pack, thereby facilitating the realization of the self-discharge function and power supply function of the battery pack.

Optionally, when the battery box is removed from the battery cover and plugged into the power tool, the positive terminal is connected to the positive power supply terminal of the main board in the power tool, and the output control terminal, the discharge terminal and the negative terminal are all connected to the negative power supply of the main board in the power tool. end. Therefore, when the battery pack is in use, the power supply function of the battery pack can be realized by electrically connecting the connection terminals on the battery box, and the operation is simple and convenient.

Optionally, the battery box is further provided with a data terminal and a clock terminal, the data terminal is connected with the data pin in the battery cover, and the clock terminal is connected with the clock pin in the battery cover. Therefore, by setting the data terminal and the clock terminal, etc., it is convenient to realize the data transmission between the inside and the outside of the battery pack, and then it is convenient to realize the monitoring function of the battery pack.

In a second aspect, an embodiment of the present disclosure provides a power tool, including: the above-mentioned battery pack with a self-discharge function; and a battery installation compartment, where the battery installation compartment is used for installing a battery box in the battery pack.

The power tool proposed by the embodiments of the present disclosure is provided with a self-discharge unit, a battery box and a battery cover, and whether the self-discharge switch is disconnected or not is controlled by whether the battery box and the battery cover are plugged or not, and then whether the self-discharge unit is controlled. Carry out self-discharge work to achieve the purpose of discharging the cells in the battery pack when the battery pack is no longer used or discarded, so as to reduce the power of the cells to a safe power range, thereby effectively avoiding the discarded The power of the battery is sufficient to cause a safety accident.

Optionally, the battery installation compartment is provided on the handle of the power tool. Therefore, not only the design is beautiful, but also the position is eye-catching, which is convenient for users to disassemble and assemble.

Optionally, the power tool is an electric stapler.

The beneficial effects of the present disclosure are: the battery pack and electric tool with self-discharge function of the present disclosure control whether the self-discharge switch is disconnected or not by using whether the battery cover and the battery box are plugged in or not, and then control whether the self-discharge unit is disconnected or not. Compared with the prior art, it can discharge the cells in the battery pack when the battery pack is no longer used, that is, discarded, so as to reduce the power of the cells to a safe power range, which achieves the The purpose of effectively avoiding the occurrence of situations that may cause the risk of accidental fire due to sufficient battery power.

Description of drawings

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limit the present disclosure. .

1-6 are schematic structural diagrams of a battery pack with a self-discharge function according to an embodiment of the present disclosure.

detailed description

In order to better explain the present disclosure and facilitate understanding, the present disclosure will be described in detail below with reference to the accompanying drawings and through specific embodiments.

The battery pack and power tool with self-discharge function proposed by the embodiments of the present disclosure include a battery box, a self-discharge unit, and a battery cover. The self-discharge unit includes a self-discharge switch for controlling whether the self-discharge unit performs discharge work. Inside the battery box There is a battery, the positive terminal of the battery is connected to one end of the self-discharge unit, and the negative terminal of the battery is connected to the other end of the self-discharge unit through the battery cover. When the battery box is inserted with the battery cover, the self-discharge switch is disconnected. In order to prohibit the self-discharge unit from discharging, and when the battery box is pulled out from the power tool and the battery cover is not inserted, the self-discharge switch is closed to enable the self-discharge unit to discharge. Therefore, whether the self-discharge switch is disconnected or not is controlled by whether the battery box and the battery cover are plugged or not, and then whether the self-discharge unit is discharged or not is controlled, so that when the battery pack is no longer used or discarded, it can be The purpose of discharging the cells in the battery pack is to reduce the power of the cells to a safe power range, thus effectively solving the technical problem that may cause an accidental fire risk when the power in the discarded battery pack is sufficient. the safety of discarded battery packs.

For a better understanding of the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more clearly and thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

FIG. 1 is a schematic structural diagram of a battery pack with self-discharge function according to an embodiment of the disclosure. Referring to FIG. 1 , the battery pack with self-discharge function includes a battery box 110 , a self-discharge unit 120 and a battery cover 130 . The self-discharge unit 120 includes a self-discharge switch 121, and the self-discharge switch 121 is used to control whether the self-discharge unit 120 performs a discharge operation. The battery box 110 is provided with a battery cell 140 , the positive end of the battery cell 140 is connected to one end of the self-discharge unit 120 , and the negative end of the battery cell 140 is connected to the other end of the self-discharge unit 120 through the battery cover 130 . When the battery case 110 is plugged with the battery cover 130, the self-discharge switch 121 is in an off state to prohibit the self-discharge unit 120 from discharging. When the battery case 110 is pulled out from the power tool and the battery cover 130 is not inserted, the self-discharge switch 121 Closed to make the self-discharge unit 120 perform a discharge operation.

Specifically, referring to FIG. 1 , the battery pack may include battery cells 140 , a self-discharge unit 120 , a battery case 110 and a battery cover 130 . Wherein, the battery cell 140 may be a single-cell battery, or composed of multiple single-cell batteries in series, parallel, or series-parallel, etc., and the single-cell battery may be a lead-acid battery or a lithium battery. The self-discharge unit 120 includes a self-discharge switch 121 , and the self-discharge switch 121 is mainly used to control whether the self-discharge unit 120 performs a discharge operation. For example, when the self-discharge switch 121 is in an off state, the self-discharge unit 120 is prohibited from discharging the battery cells 140 . ; When the self-discharge switch 121 is in the closed state, the battery cell 140 is discharged through the self-discharge unit 120 to reduce the power of the battery cell 140 to a safe power range, such as a range close to zero.

The battery box 110 is matched with the battery cover 130, wherein the battery box 110 is mainly used for placing the battery cell 140, the self-discharge unit 120 and other components to protect the battery cell 140, the self-discharge unit 120 and other components. The battery cover 130 is detachably arranged on the battery box 110, for example, is arranged on the battery box 110 in a plug-in manner, and is mainly used for plugging the battery pack on the battery box 110 when the battery pack is not in use, so as to make the The discharge switch 121 is in an off state, at this time, the self-discharge unit 120 is prohibited from discharging the battery cells 140, so as to ensure the safety of the battery pack and the adequacy of power when it is not used; and the battery pack needs to be discarded after it is used At this time, it is no longer plugged into the battery box 110 so that the self-discharge switch 121 is in a closed state. At this time, the battery cells 140 are discharged through the self-discharge unit 120 to reduce the power of the battery cells 140 to a safe power range. , in order to avoid safety accidents caused by the sufficient power of discarded battery packs.

For example, when the battery pack leaves the factory, the battery cover 130 is plugged on the battery box 110, so that the self-discharge switch 121 is in an off state, and the self-discharge unit 120 does not discharge at this time, that is, the battery cell 140 is not discharged; When the battery pack is used, the battery case 110 can be installed in a power tool (such as a stapler), so that the battery cells 140 can supply power to the power tool; when the battery pack is used and needs to be discarded, the battery case 110 Pull out the power tool, and no longer plug the battery cover 130 on the battery box 110 , so that the self-discharge switch 121 is in a closed state. At this time, the self-discharge unit 120 discharges to discharge the battery cells 140 .

In this embodiment, a self-discharge unit, a battery box and a battery cover are provided, and whether the self-discharge switch is disconnected or not is controlled by whether the battery box and the battery cover are plugged in or not, thereby controlling whether the self-discharge unit performs self-discharge work. , in order to achieve the purpose of discharging the cells in the battery pack when the battery pack is no longer used or discarded, so as to reduce the power of the cells to a safe power range, thereby effectively avoiding the discarded battery pack. A safety accident occurs due to sufficient power.

Optionally, in one embodiment, as shown in FIG. 2 , the self-discharge switch 121 is a normally closed relay J1 , and the self-discharge unit 120 further includes a self-discharge resistor R. As shown in FIG. Among them, one end of the normally closed switch in the normally closed relay J1 is connected to the positive terminal of the battery cell 140, and the other end of the normally closed switch in the normally closed relay J1 is connected to the negative terminal of the battery cell 140 through the self-discharge resistance R, and the normally closed One end of the coil in the closed relay J1 is connected to the positive terminal of the battery cell 140, the other end of the coil in the normally closed relay J1 is connected to the discharge pin TH in the battery cover 130, and the discharge pin TH in the battery cover 130 is connected to the battery The negative pin P- in the cover 130 is connected to the negative terminal of the battery cell 140 after being connected.

That is to say, the self-discharge unit 120 may be composed of a normally closed relay J1 and a self-discharge resistor R, wherein the positive terminal of the battery cell 140 is connected to one end of the coil in the normally closed relay J1 and one end of the normally closed switch in the normally closed relay J1 respectively. connected, the other end of the normally closed switch in the normally closed relay J1 is connected to the negative terminal of the battery cell 140 through the self-discharge resistance R, and when the battery cover 130 is inserted into the battery box 110, the coil in the normally closed relay J1 The other end and the negative terminal of the battery cell 140 are correspondingly connected to the pins in the battery cover 130, so that under the action of the battery cover 130, the normally closed relay J1 is controlled on and off, so as to determine whether to pass the self-discharge resistance R to the battery cell. 140 to discharge. The self-discharge resistor R can be a single resistor or a plurality of resistors connected in series. The power of the battery cell 140 is consumed through the self-discharge resistor R to achieve the purpose of discharging the battery cell 140 , and the resistance value of the self-discharge resistor R It can be set according to the discharge time, which is not limited here.

Specifically, as shown in FIG. 2 , the battery cover 130 includes a discharge pin TH and a negative electrode pin P-, and the discharge pin TH is communicated with the negative electrode pin P- (eg, communicated through a metal wire). When the battery cover 130 is inserted into the battery box 110 , the other end of the coil in the normally closed relay J1 is connected to the discharge pin TH in the battery cover 130 , and the negative terminal of the battery cell 140 is connected to the negative terminal of the battery cover 130 . Pin P- is connected, and at the same time, because the discharge pin TH is connected with the negative pin P-, the battery cell 140, the coil in the normally closed relay J1, the discharge pin TH in the battery cover 130 and the negative electrode in the battery cover 130 are connected. Pin P- forms a closed loop, the coil in the normally closed relay J1 is energized, and the normally closed switch in the normally closed relay J1 is disconnected. At this time, it is forbidden to discharge the battery cell 140 through the self-discharge resistor R; When connected to the battery box 110, the other end of the coil in the normally closed relay J1 is in a disconnected state from the negative terminal of the battery cell 140, the coil in the normally closed relay J1 has no electricity, and the normally closed circuit in the normally closed relay J1 is in a disconnected state. The switch is in the closed state. At this time, the battery cell 140, the normally closed switch in the normally closed relay J1, and the self-discharge resistor R form a closed loop. When discarded, it can self-discharge to avoid safety accidents caused by the sufficient power of the discarded battery pack.

In this embodiment, a self-discharge circuit is formed by a normally closed relay and a self-discharge resistor, so as to realize the self-discharge function of the battery pack, and the circuit structure is simple and the reliability is high. Of course, the self-discharge unit may also adopt other circuit structures, which are not specifically limited here.

Optionally, in one embodiment, as shown in FIG. 3 , the battery pack with self-discharge function further includes an output control unit 150 , one end of the output control unit 150 is connected to the positive end of the battery cell 140 , and the output control unit 150 The other end is connected to the battery cover 130, wherein the output control unit 150 is in a closed state when the battery box 110 is unplugged from the battery cover 130 and plugged into the power tool, so that the battery box 110 supplies power to the power tool.

That is to say, the output control unit 150 can be arranged in the battery box 110, and when the battery pack is used, the battery cover 130 on the battery box 110 can be pulled out and installed on the power tool, for example, plugged into the power tool ( In the battery installation compartment of the stapler), the output control unit 150 is in a closed state at this time, and the battery cell 140 starts to supply power to the power tool.

Specifically, as shown in FIG. 3 , the battery pack may include a battery cell 140 , a self-discharge unit 120 , an output control unit 150 , a battery box 110 and a battery cover 130 , wherein the battery cell 140 , the self-discharge unit 120 and the output control unit 150 Both are arranged in the battery box 110 , and the battery cover 130 is detachably arranged on the battery box 110 and has a connection circuit inside. When the battery pack leaves the factory, the battery cover 130 is plugged on the battery box 110 so that the self-discharge switch 121 is in an off state. At this time, the self-discharge unit 120 does not discharge, that is, does not discharge the battery cell 140; When the pack is in use, unplug the battery cover 130 on the battery box 110 and plug it into the power tool. At this time, the output control unit 150 is in a closed state, and the battery cell 140 supplies power to the power tool; after the battery pack is used and When it needs to be discarded, the battery box 110 is pulled out of the power tool and the battery cover 130 is no longer plugged into the battery box 110, so that the self-discharge switch 121 is in a closed state, and the self-discharge unit 120 discharges at this time. , to discharge the battery cell 140 .

In this embodiment, by providing a self-discharge unit, an output control unit, a battery box and a battery cover, not only can the battery cover be inserted into the battery box to protect the battery pack when the battery pack is not in use, but also The ability to power the power tool by inserting the battery case into the power tool when the battery pack is in use, and to be able to remove the battery case from the power tool and unplug it when the battery pack is discarded The battery cover is used to discharge the battery cells to avoid safety accidents caused by sufficient battery power when the battery pack is discarded.

Optionally, in one embodiment, as shown in FIG. 4 , the output control unit 150 includes a normally open relay J2, one end of the normally open switch in the normally open relay J2 is connected to the positive terminal of the cell 140, and the normally open relay J2 The other end of the normally open switch is connected to the positive pin P+ in the battery cover 130, one end of the coil in the normally open relay J2 is connected to the positive terminal of the battery cell 140, and the other end of the coil in the normally open relay J2 is connected to the battery The output control pin SD in the cover 130 is connected.

That is to say, the output control unit 150 may be constituted by the normally open relay J2, wherein the positive terminal of the battery cell 140 is connected to one end of the coil in the normally open relay J2 and one end of the normally open switch in the normally open relay J2, respectively, and when the battery When the box 110 is plugged into the power tool, the coil in the normally open relay J2 is energized through the corresponding connection line in the power tool, and the normally open switch in the normally open relay J2 is in a closed state, so that the battery core 140 is powered by the electric power tool. Tool power supply.

In this embodiment, a power supply circuit is formed by a normally open relay, so as to realize the power supply function of the battery pack, and the circuit structure is simple and the reliability is high. At the same time, when the battery cover is inserted into the battery box, the other end of the coil in the normally open relay and the other end of the normally open switch in the normally open relay are also protected by the battery cover to ensure that the battery pack is not in use. security. Of course, the output control unit may also adopt other circuit structures, which are not specifically limited here.

Optionally, as shown in FIG. 4 , both the self-discharge unit 120 and the output control unit 150 are arranged in the battery box 110 , and the battery box 110 is respectively provided with a positive terminal P0+, an output control terminal SD0, a discharge terminal TH0 and a negative terminal. P0-, the positive terminal P0+ is used to connect to the positive pin P+ in the battery cover 130 , the output control terminal SD0 is used to connect to the output control pin SD in the battery cover 130 , the discharge terminal TH0 is used to connect the discharge pin in the battery cover 130 . The pin TH, the negative terminal P0- is used to connect to the negative pin P- in the battery cover 130. Therefore, by arranging corresponding connection terminals on the battery box, it is convenient to realize the electrical connection inside the battery pack and between the inside and the outside of the battery pack, thereby facilitating the realization of the self-discharge function and power supply function of the battery pack.

Further, as shown in FIG. 5 , when the battery box 110 is unplugged from the battery cover 130 and plugged into the power tool, the positive terminal P0+ is connected to the positive power supply terminal P1+ of the main board 210 in the power tool, and the output control terminal SD0 and the discharge terminal TH0 and the negative terminal P0- are both connected to the negative power supply terminal P1- of the main board 210 in the power tool.

Specifically, when the battery pack is in use, the battery cover 130 on the battery box 110 can be unplugged and inserted into the battery installation compartment of the power tool. At this time, the positive terminal P0+ on the battery box 110 is connected to the power tool. The positive power supply terminal P1+ of the main board 210 is connected, and the output control terminal SD0, the discharge terminal TH0 and the negative terminal P0- are connected with the negative power supply terminal P1- of the main board 210 in the power tool through the connecting line on the main board 210 in the power tool. At this time, the coil in the normally closed relay J1 is energized, the normally closed switch in the normally closed relay J1 is disconnected, and the self-discharge resistor R is prohibited from discharging the battery cell 140, and at the same time, the coil in the normally open relay J2 is energized and normally open The normally open switch in the relay J2 is in a closed state, and the battery cell 140 supplies power to the power tool.

In this embodiment, when the battery pack is used, the power supply function of the battery pack can be realized by electrically connecting the terminals on the battery box, and the operation is simple and convenient.

Optionally, in one embodiment, the battery box 110 is further provided with a data terminal and a clock terminal (not shown in the figure), the data terminal and the data pin in the battery cover 130 (not shown in the figure). ) is connected, and the clock terminal is connected with the clock pin (not shown in the figure) in the battery cover 130 . By setting the data terminal and the clock terminal, it is convenient to realize the data transmission between the inside and the outside of the battery pack, so as to facilitate the realization of the monitoring function of the battery pack.

For example, a battery management unit is provided in the battery box 110, and the data output terminal of the battery management unit is connected to the data terminal on the battery box 110, and the clock signal terminal is connected to the clock terminal on the battery box 110. When in use, the battery cover 130 on the battery box 110 is unplugged and inserted into the power tool. The data terminal on the battery box 110 is connected with the data acquisition terminal of the main board 210 in the power tool, and the clock terminal on the battery box 110 is connected to the power tool. In the power tool, the clock signal terminal of the main board 210 is connected, and the battery management unit transmits the relevant information of the battery pack, such as cell power information, voltage information, etc., to the power tool through the data terminal of the battery box 110, and synchronizes through the clock terminal. In order to realize the synchronous transmission of the signal, prevent data loss, etc., and then realize the effective monitoring of the battery pack. In this way, it is not only possible to determine whether the battery pack is in a normal working state according to the power and voltage of the battery pack, but also to determine whether the battery pack meets the actual needs according to the power of the battery pack before it is officially used. The remaining power is used to determine whether the battery pack can be used again, so as to reduce the waste and pollution problems caused by the one-time use of the battery pack.

As a specific embodiment of the present disclosure, referring to FIG. 6 , a battery pack may include a battery cell 140 , a self-discharge unit 120 , an output control unit 150 , a battery management unit, a battery box 110 and a battery cover 130 , wherein the battery cells 140 , The self-discharge unit 120, the output control unit 150, the battery management unit, etc. are arranged in the battery case 110, and the battery case 110 is provided with a positive terminal P0+, an output control terminal SD0, a discharge terminal TH0, a negative terminal P0-, a data terminal and a clock At the same time, set 10 pins (Pin) on the battery cover 130 as shown in Table 1, and among these 10 pins, the positive pin P+, the output control pin SD, the clock pin CLK, and the data pin The DATA and the negative pin P- are both floating, and the discharge pin TH is connected to at least one negative pin P-; at the same time, a connector corresponding to the pins of the battery cover 130 is set on the main board 210 of the power tool. And the connector is connected to the output control pin SD, the discharge pin TH and the terminal corresponding to at least one negative pin P- in the battery cover 130 (refer to FIG. 5).

Table 1

引脚号pin number	定义definition	用法usage
11	P+P+	空null
22	P+P+	空null
33	P+P+	空null
44	SDSD	空null
55	THTH	连至P-端connected to the P-terminal
66	CLKCLK	空null
77	DATADATA	空null
88	P-P-	连到TH端Connect to TH terminal
99	P-P-	空null
1010	P-P-	空null

When the battery pack is not in use, for example, when the battery pack leaves the factory, the battery cover 130 is inserted into the battery box 110. Since the discharge pin TH of the battery cover 130 is connected to at least one negative pin P-, the normally closed The coil in the relay J1 is energized, the normally closed switch in the normally closed relay J1 is disconnected, the self-discharge resistance R is disconnected, and no self-discharge is performed at this time; when the battery pack is used, for example, to supply power to a power tool, at this time Unplug the battery cover 130 from the battery box 110, and plug the battery box 110 into the power tool, because the main board 210 of the power tool is connected to the output control pin SD, the discharge pin TH and at least one of the output control pins SD in the battery cover 130. The terminals corresponding to the negative pin P- are connected, so that the output control terminal SD0, the discharge terminal TH0 and the negative terminal P0- of the battery box 110 are connected, so that the coil in the normally closed relay J1 and the coil in the normally open relay J2 are connected. Both are powered on, the normally closed switch in the normally closed relay J1 is disconnected, and the normally open switch in the normally open relay J2 is closed, while the self-discharge function is disabled, power is supplied to the power tool, and the battery management unit also passes the clock terminal and The data terminal sends the relevant data of the battery pack, such as the power of the battery cells, to the power tool by serial synchronous transmission (such as SMBUS, IIC and other communication methods); when the battery pack is used and needs to be discarded, the battery box 110 Unplug the power tool and no longer plug the battery cover 130. Since all the terminals of the battery box 110 are floating, the coil in the normally closed relay J1 has no electricity, the normally closed switch in the normally closed relay J1 is closed, and the self-discharge resistance R is turned on, and self-discharge is performed at this time, so as to discharge the power of the battery cell 140 to a safe power range within a specified time, so as to avoid accidents such as fire.

To sum up, the battery pack with the self-discharge function proposed by the embodiments of the present disclosure can self-discharge the battery pack when it is discarded, so as to prevent the occurrence of safety accidents.

An embodiment of the present disclosure further provides a power tool, which includes the above-mentioned battery pack with a self-discharge function and a battery installation compartment, where the battery installation compartment is used for installing a battery box in the battery pack.

Optionally, in one embodiment, the battery mounting compartment is provided on the handle of the power tool. Therefore, not only the design is beautiful, but also the position is eye-catching, which is convenient for users to disassemble and assemble.

Optionally, in one embodiment, the power tool is a power stapler.

It should be noted that, for the specific description of the power tool in the embodiment of the present disclosure, reference may be made to the description of the battery pack with the self-discharge function in the embodiment of the present disclosure, and details are not repeated here. In addition, the battery pack with the self-discharge function of the embodiments of the present disclosure can be used not only in staplers, but also in other electric tools or other electrical equipment, which is not specifically limited here.

In the description of the present disclosure, it should be understood that the terms "first" and "second" are only used for description purposes, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present disclosure, "plurality" means two or more, unless expressly and specifically defined otherwise.

In the present disclosure, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

In the present disclosure, unless expressly stated and defined otherwise, a first feature is "above" or "under" a second feature, either in direct contact with the first and second features, or through an intermediary between the first and second features indirect contact. Also, the first feature is "above", "above" and "above" the second feature, which may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature . The first feature is "below", "below" and "below" the second feature, which can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is level below the second feature.

In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "example", "specific example" or "some examples" and the like are described in conjunction with the embodiment or example A particular feature, structure, material, or characteristic described is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limitations of the present disclosure, and those of ordinary skill in the art may interpret the above-described embodiments within the scope of the present disclosure. Embodiments are subject to alterations, modifications, substitutions and variations.

Claims

A battery pack with self-discharge function, comprising a battery box, a self-discharge unit and a battery cover, the self-discharge unit includes a self-discharge switch, and the self-discharge switch is used to control whether the self-discharge unit performs discharge work, so the self-discharge unit includes a self-discharge switch. The battery box is provided with a cell, the positive terminal of the cell is connected to one end of the self-discharge unit, and the negative terminal of the cell is connected to the other end of the self-discharge unit through the battery cover, so When the battery box is plugged with the battery cover, the self-discharge switch is in an off state to prohibit the self-discharge unit from discharging, and when the battery box is pulled out from the power tool and the battery cover is not inserted , the self-discharge switch is closed to make the self-discharge unit discharge.
The battery pack with self-discharge function according to claim 1, wherein the self-discharge switch is a normally closed relay, the self-discharge unit further comprises a self-discharge resistor, wherein the normally closed switch in the normally closed relay One end is connected to the positive terminal of the battery cell, the other end of the normally closed switch in the normally closed relay is connected to the negative terminal of the battery cell through the self-discharge resistance, and the coil in the normally closed relay is connected to the negative terminal of the battery core. One end is connected with the positive terminal of the battery cell, and the other end of the coil in the normally closed relay is connected with the discharge pin in the battery cover, and the discharge pin in the battery cover is connected with the discharge pin in the battery cover. The negative pin is connected to the negative terminal of the battery cell.
The battery pack with self-discharge function according to claim 1 or 2, further comprising an output control unit, one end of the output control unit is connected to the positive terminal of the battery cell, and the other end of the output control unit is connected to the positive terminal of the battery cell. The battery cover is connected, wherein the output control unit is in a closed state when the battery box is removed from the battery cover and inserted into the power tool, so that the battery box supplies power to the power tool.
The battery pack with self-discharge function according to claim 3, wherein the output control unit comprises a normally open relay, and one end of the normally open switch in the normally open relay is connected to the positive terminal of the battery cell, so The other end of the normally open switch in the normally open relay is connected to the positive pin in the battery cover, one end of the coil in the normally open relay is connected to the positive terminal of the battery cell, and the normally open relay is connected to the positive terminal of the battery. The other end of the coil is connected to the output control pin in the battery cover.
The battery pack with self-discharge function according to claim 4, wherein the self-discharge unit and the output control unit are both arranged in the battery box, and the battery box is respectively provided with a positive terminal, an output control unit terminal, discharge terminal and negative terminal, the positive terminal is used for connecting the positive pin in the battery cover, the output control terminal is used for connecting the output control pin in the battery cover, the discharging terminal is used for The discharge pin in the battery cover is connected, and the negative terminal is used for connecting with the negative pin in the battery cover.
The battery pack with self-discharge function according to claim 5, wherein when the battery box is unplugged from the battery cover and plugged into the power tool, the positive terminal is connected to the main board of the power tool. The positive power supply terminal, the output control terminal, the discharge terminal and the negative terminal are all connected to the negative power supply terminal of the main board in the power tool.
The battery pack with self-discharge function according to claim 5, wherein the battery box is further provided with a data terminal and a clock terminal, the data terminal is connected to a data pin in the battery cover, and the clock terminal is The terminals are connected to the clock pins in the battery cover.
A power tool comprising:

The battery pack with self-discharge function according to any one of claims 1-7;

The battery installation compartment is used for installing the battery box in the battery pack.
The power tool of claim 8, wherein the battery mounting compartment is provided on a handle of the power tool.
The power tool according to claim 8 or 9, wherein the power tool is an electric stapler.