A battery pack and a power tool

Abstract

The utility model discloses a kind of battery pack and electric tool, battery pack includes shell, battery monomer, circuit board and temperature sensor, shell inside is equipped with accommodating cavity;Battery monomer is located in accommodating cavity;Circuit board is located in accommodating cavity, and is located at one end of battery monomer, and first interface, second interface, indicator, switch and controller are equipped on circuit board;Temperature sensor is located in accommodating cavity, is connected in circuit board by first lead, and temperature sensor is located at one side of battery monomer;Wherein, controller is used to receive the visual indication of at least one input signal in first interface, second interface and switch after control indicator provides.It can be realized in the case where trigger switch or first interface and external access or second interface and external access battery pack can provide temperature and power state as needed to user, any charging and / or discharging of battery pack is facilitated to plan, on the basis of not increasing circuit board, the state visual indication of battery monomer is realized.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a battery pack and a power tool. Background Technology

[0002] In single-cell batteries (low-voltage handheld tools such as 4V), due to the extremely limited internal space, the industry standard practice is to retain only the core protection circuitry (overcharge, over-discharge, and overcurrent protection) and basic interface terminals for interactive charging and discharging with the machine or charger. However, the state of the individual battery cells within the battery pack may be unknown to the user, requiring the addition of a second circuit board for setting up switches and temperature sensors, which complicates assembly and increases assembly costs.

[0003] Therefore, how to achieve visual indication of the status of individual battery cells without adding circuit boards is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack and power tool that can achieve visual indication of the status of individual battery cells without adding a circuit board.

[0005] To achieve the above objectives, this utility model provides a battery pack, comprising:

[0006] The shell has an internal cavity;

[0007] The battery cell is located inside the housing cavity;

[0008] The circuit board is located inside the receiving cavity and at one end of the battery cell. The circuit board is provided with a first interface, a second interface, an indicator, a switch and a controller. The second interface includes a positive electrode connection piece and a negative electrode connection piece.

[0009] A temperature sensor is located inside the housing cavity and is connected to the circuit board via a first lead. The temperature sensor is located on one side of the battery cell.

[0010] The controller is used to control the indicator to provide visual indication after receiving at least one input signal from the first interface, the second interface, and the switch.

[0011] In one possible implementation, the circuit board includes a first side facing the battery cell and a second side facing away from the battery cell. A first interface, an indicator, and a switch are all located on the second side, with the first interface located at the edge of the second side, the switch located in the middle of the second side, and the indicator located on the side of the switch facing away from the first interface.

[0012] In one possible implementation, the indicator includes multiple LEDs arranged in an arc around the center of the switch.

[0013] In one possible implementation, the circuit board is electrically connected to the positive terminal of the battery cell, and the circuit board is electrically connected to the negative terminal of the battery cell via a second lead. The second lead is connected to the edge of the circuit board and is disposed adjacent to the first lead.

[0014] In one possible implementation, the circuit board is also connected to a temperature signal detection terminal, which is located at the edge of the circuit board, and the first interface, the indicator, and the temperature signal detection terminal are arranged in a first straight line.

[0015] In one possible implementation, the positive electrode connector is arranged adjacent to the positive terminal, and the negative electrode connector is arranged adjacent to the second lead. Both the positive electrode connector and the negative electrode connector are located at the edge of the circuit board, and the positive electrode connector, the switch, and the negative electrode connector are arranged in a second straight line, which is perpendicular to the first straight line.

[0016] In one possible implementation, the circuit board is also connected to a charge / discharge MOSFET, a lithium battery protection center, and a charging chip. The charge / discharge MOSFET, the lithium battery protection center, and the charging chip are all located on the first side, with the charging chip located in the middle of the first side. The charge / discharge MOSFET is located between the charging chip and the negative electrode connection piece, and the lithium battery protection center is located between the charging chip and the temperature signal detection terminal.

[0017] In one possible implementation, the second side is also connected to a power display chip and a short-circuit fuse, with the power display chip disposed adjacent to the indicator and the short-circuit fuse disposed adjacent to the first interface.

[0018] In one possible implementation, a support block is provided between the first side and the battery cell.

[0019] Based on the above, this application also provides an electrical tool, including the battery pack of any of the above.

[0020] Compared with the prior art, the technical solution provided by this utility model has at least the following beneficial effects: Specifically, the circuit board is located in the housing cavity and at one end of the battery cell. The circuit board is provided with a first interface, a second interface, an indicator, and a controller. The second interface includes a positive terminal connection piece and a negative terminal connection piece. The switch is also set on the circuit board, and the temperature sensor is led out from the circuit board through a first lead. The controller is used to control the indicator to provide visual indication after receiving at least one input signal from the first interface, the second opening, and the switch. In other words, by providing visual indication of the charging status of the battery cells in the battery pack and / or the temperature and remaining charge of the batteries in the battery cells, the battery pack can provide the user with temperature and power status as needed when the switch or the first interface or the second interface is triggered and connected to the outside. This allows the user to conveniently plan any charging and / or discharging of the battery pack. With this configuration, the status visual indication of the battery cells is achieved without adding a circuit board. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the battery pack from another perspective, provided in an embodiment of the present utility model.

[0024] Figure 3 This is a top view of the battery pack provided in an embodiment of the present utility model;

[0025] Figure 4 for Figure 3 A sectional view along the middle AA;

[0026] Figure 5 for Figure 3 A sectional view along the center CC;

[0027] Figure 6 This is a schematic diagram of the structure of a battery pack without a housing provided in an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the structure of a battery pack without assembled housing and battery provided in an embodiment of the present utility model;

[0029] Figure 8 This is a schematic diagram of the battery pack without assembled casing and battery provided in an embodiment of the present utility model from another perspective.

[0030] Figure 9 This is a schematic diagram of the circuit board structure provided in an embodiment of the present utility model;

[0031] Figure 10 This is a schematic diagram of the structure of the first side of the circuit board provided in an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the second side of the circuit board provided in an embodiment of the present invention.

[0033] in:

[0034] 100 - Shell, 110 - First arcuate surface, 120 - First flat surface;

[0035] 200 - Battery cell, 210 - Positive terminal, 220 - Negative terminal, 230 - Positive electrode connector, 240 - Negative electrode connector;

[0036] 300-Circuit board, 310-First interface, 320-Indicator, 330-Switch, 340-First side, 350-Second side, 351-Power display chip, 352-Short circuit fuse, 360-Temperature signal detection terminal, 370-Charging and discharging MOSFET, 380-Lithium battery protection center, 390-Charging chip;

[0037] 400 - Temperature sensor;

[0038] 500 - First lead;

[0039] 600 - Second lead;

[0040] 700 - First straight line;

[0041] 800 - Second straight line;

[0042] 900-button;

[0043] 1000-Support Block. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0047] The purpose of this invention is to provide a battery pack and power tool that can achieve visual indication of the status of individual battery cells without adding a circuit board.

[0048] Please see Figures 1 to 11 To achieve the above objectives, this utility model provides a battery pack, including a housing 100, a battery cell 200, a circuit board 300, and a temperature sensor 400. The housing 100 has an internal cavity, comprising a bottom shell and a top cover. The bottom shell has an internal space and an opening at one end. The top cover is connected to the opening of the bottom shell to form the housing 100 with the cavity. The battery cell 200 is located within the cavity, specifically within the space of the bottom shell. The circuit board 300 is located within the cavity, at the end of the battery cell 200 facing the top cover. The circuit board 300 has a first interface 310, a second interface, and a... The device includes an indicator 320, a switch 330, and a controller. The second interface includes a positive terminal connector 230 and a negative terminal connector 240. A temperature sensor 400 is located inside the housing cavity and is connected to the circuit board 300 via a first lead 500. The temperature sensor 400 is located on one side of the battery cell 200 and is used to transmit the temperature of the battery cell 200 to the circuit board 300. The temperature sensor 400 can be a negative temperature coefficient thermistor or a positive temperature coefficient thermistor. The controller is used to control the indicator 320 to provide visual indication after receiving at least one input signal from the first interface 310, the second interface, and the switch 330.

[0049] It should be noted that the outer side of the bottom shell includes a first arcuate surface 110 and a first flat surface 120, and the outer side of the top cover includes a second arcuate surface and a second flat surface. The first arcuate surface 110 and the second arcuate surface correspond to each other in the length direction of the battery pack, and the first flat surface 120 and the second flat surface correspond to each other in the length direction of the battery pack. A first through hole is provided on the second flat surface for external devices to connect to the first interface 310 through the first through hole for charging or discharging. The top cover also includes a third flat surface 120, which is located on the side of the top cover away from the bottom shell. A button 900 is provided on the third flat surface 120. When it is necessary to know the temperature and / or charge of the battery cell 200, the button 900 is pressed to trigger the switch 330 or to connect to the outside through the first interface 310 or the second interface, so that the indicator 320 provides visual indication.

[0050] The circuit board 300 is located within the housing cavity of the housing 100 and at one end of the battery cell 200. The circuit board 300 is provided with a first interface 310, a second interface, an indicator 320, and a controller. The second interface includes a positive terminal connection piece 230 and a negative terminal connection piece 240. The switch 330 is also located on the circuit board 300, and the temperature sensor 400 is led out from the circuit board 300 through a first lead 500. The controller is used to control the indicator 320 to provide visual indication after receiving at least one input signal from the first interface 310, the second interface, and the switch 330. In other words, by providing visual indication of the charging status of the battery cell 200 and / or the temperature and remaining charge of the battery in the battery cell 200, the battery pack can provide temperature and power status to the user as needed when the switch 330 or the first interface 310 or the second interface is connected to the outside, thereby allowing the user to conveniently plan any charging and / or discharging of the battery pack. In this way, the status visual indication of the battery cell 200 is achieved without adding a circuit board 300. This reduces the complexity of the assembly process; it also reduces the number of redundant circuit boards 300, saving raw material costs and reducing the space occupied inside the housing 100.

[0051] In one possible implementation, the circuit board 300 includes a first side 340 facing the battery cell 200 and a second side 350 facing away from the battery cell 200. A first interface 310, an indicator 320, and a switch 330 are all located on the second side 350, with the first interface 310 located at the edge of the second side 350, the switch 330 located in the center of the second side 350, and the indicator 320 located on the side of the switch 330 facing away from the first interface 310. The indicator 320 includes multiple LEDs arranged in an arc around the center of the switch 330. It should be noted that the circuit board 300 includes a first side 340 and a second side 350. A support block 1000 is provided between the first side 340 of the battery board and the battery cell 200. The support block 1000 is made of insulating material and is used to support the circuit board 300. The first interface 310, indicator 320 and switch 330 are all located on the second side 350, that is, the first interface 310, indicator 320 and switch 330 are located further away from the battery cell 200 to improve the heat dissipation effect of the first interface 310, indicator 320 and switch 330. At the same time, the first interface 310 is located further away from the battery cell 200. The first interface 310 and the indicator 320 are located on different sides of the switch 330, so that there is a large gap between the first interface 310 and the indicator 320, which facilitates the heat dissipation when the first interface 310 and the indicator 320 are working. The first interface 310 can be, but is not limited to, a Type-C interface. The Type-C interface is used for charging and discharging the battery cell 200. The indicator 320 includes multiple LEDs. The number of LEDs can be increased or decreased according to actual needs. The LEDs are located on the side of the switch 330 away from the first interface 310 and are arranged in an arc around the center of the switch 330.

[0052] In one possible implementation, the circuit board 300 is electrically connected to the positive terminal 210 of the battery cell 200, and the circuit board 300 is electrically connected to the negative terminal 220 of the battery cell 200 via a second lead 600. The positive terminal 210 of the battery cell 200 includes a first terminal component located on a first side 340 of the circuit board 300, and a second terminal component bent relative to the first terminal component toward a second side 350 of the circuit board 300 away from the battery cell 200. The second lead 600 is connected to the edge of the circuit board 300 and is arranged adjacent to the first lead 500. The circuit board 300 acquires the voltage of the positive terminal 210 and the negative terminal 220 of the battery cell 200 to further acquire the power information of the battery cell 200 based on the voltage. The adjacent arrangement of the second lead 600 and the first lead 500 facilitates the arrangement of the first lead 500 and the second lead 600 in the same area, avoiding the occupation of too much internal space.

[0053] In one possible implementation, the circuit board 300 is also connected to a temperature signal detection terminal 360. The temperature signal detection terminal 360 is located at the edge of the circuit board 300 and is electrically connected to the circuit board 300. The second arc-shaped surface of the top cover is provided with a second through hole, which is used to connect the external electrical device to the temperature signal detection terminal 360 at the second through hole to display the temperature information of the battery cell 200 when the battery pack is connected to an external electrical device. The first interface 310, the indicator 320, and the temperature signal detection terminal 360 are arranged in a first straight line 700, that is, the temperature signal detection terminal 360 is located at the end of the circuit board 300 away from the first interface 310, so that there is a large gap between the temperature signal detection terminal 360 and the first interface 310, which facilitates the dissipation of heat when the first interface 310 and the temperature signal detection terminal 360 are working. The straight line arrangement is one of the ways to make efficient use of space in a small space, avoiding the problem of heat concentration caused by the small distance between the first interface 310, the indicator 320, and the temperature signal detection terminal 360.

[0054] In one possible implementation, the positive electrode connector 230 is electrically connected to the circuit board 300, and is adjacent to the positive terminal 210, which simplifies the wiring between the positive electrode connector 230 and the positive terminal 210. The negative electrode connector 240 is electrically connected to the circuit board 300, and is adjacent to the second lead 600, which simplifies the wiring between the negative electrode connector 240 and the second lead 600. Both the positive electrode connector 230 and the negative electrode connector 240 are located at the edge of the circuit board 300. The second arc-shaped surface of the top cover has a third through hole and a fourth through hole. External electrical components connect to the positive electrode connector 230 at the third through hole to electrically connect to the positive terminal 210 of the battery cell 200. The electrical component is connected to the negative terminal 240 at the fourth through hole to electrically connect to the negative terminal 220 of the battery cell 200, so that the battery cell 200 supplies power to the electrical component. The positive terminal 230, the switch 330 and the negative terminal 240 are arranged in a second straight line 800, which is perpendicular to the first straight line 700. That is, the positive terminal 230, the negative terminal 240, the first interface 310 and the temperature signal detection terminal 360 are evenly arranged in the circumferential direction of the circuit board 300, which facilitates the connection with external electrical components. At the same time, the positive terminal 230 and the negative terminal 240 are arranged opposite each other, which effectively avoids the short circuit problem that may be caused when the positive terminal 230 and the negative terminal 240 are arranged adjacent to each other.

[0055] In one possible implementation, the circuit board 300 is also connected to a charge / discharge MOSFET 370, a lithium battery protection center 380, and a charging chip 390. The charge / discharge MOSFET 370, the lithium battery protection center 380, and the charging chip 390 are all located on the first side 340, with the charging chip 390 located in the middle of the first side 340. The charge / discharge MOSFET 370 is located between the charging chip 390 and the negative electrode connection piece 240, and the lithium battery protection center 380 is located between the charging chip 390 and the temperature signal detection terminal 360. The charge / discharge MOSFET 370 is used to control the current flowing into the battery cell 200 and the current flowing out of the battery cell 200. The lithium battery protection center 380 is used to monitor the voltage and charge / discharge current of the battery cell 200 to prevent damage caused by overcharging, over-discharging, short circuits, etc. The charging chip 390 and the charge / discharge MOSFET 370 are the main heat sources on the circuit board 300. Placing the charging chip 390 in the middle facilitates the dispersion of the heat source of the charging chip 390. To prevent heat from accumulating in a corner, which could cause localized overheating and trigger protection mechanisms or damage components.

[0056] In one possible implementation, the second side 350 is also connected to a power display chip 351 and a short-circuit fuse 352. That is, the power display chip 351 and the short-circuit fuse 352 are arranged on the side of the circuit board 300 that is farther away from the battery cell 200, so as to avoid the power display chip 351 and the short-circuit fuse 352 from getting too hot and to easily maintain the stable state of the power display chip 351 and the short-circuit fuse 352. The power display chip 351 is arranged adjacent to the indicator 320 and arranged on the same side, which makes it easier to shorten the electrical signal transmission path. The short-circuit fuse 352 is arranged adjacent to the first interface 310.

[0057] Based on the above, this application also provides a battery pack operation method, which includes: receiving an input signal from at least one of a first interface 310, a second interface, and a switch 330; controlling an indicator 320 to provide visual indication based on the input signal; wherein the first interface 310, the second interface, and the switch 330 are disposed on the same circuit board 300. Specifically, after receiving an input signal from at least one of the first interface 310, the second interface, and the switch 330 through a controller on the circuit board 300, the indicator 320 is controlled to provide visual indication, so that when the switch 330 or the first interface 310 or the second interface is connected to an external source is triggered, the battery pack can provide temperature and power status to the user as needed, thereby allowing the user to conveniently plan any charging and / or discharging of the battery pack.

[0058] Based on the above, this application also provides an electrical tool, including the battery pack of any of the above-mentioned items. The electrical tool also has all the beneficial effects of the battery pack. The electrical tool includes, but is not limited to, electric drills, circular saws, angle grinders, straight grinders, impact wrenches, etc. The remaining structure of the electrical tool can be referred to the prior art, and will not be described in detail here.

[0059] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing (100) has an internal cavity; The battery cell (200) is located within the receiving cavity; A circuit board (300) is located inside the receiving cavity and at one end of the battery cell (200). The circuit board (300) is provided with a first interface (310), a second interface, an indicator (320), a switch (330) and a controller. The second interface includes a positive electrode connecting piece (230) and a negative electrode connecting piece (240). A temperature sensor (400) is located inside the receiving cavity and is connected to the circuit board (300) via a first lead (500), and the temperature sensor (400) is located on one side of the battery cell (200); The controller is used to control the indicator (320) to provide visual indication after receiving at least one input signal from the first interface (310), the second interface and the switch (330).

2. The battery pack according to claim 1, characterized in that, The circuit board (300) includes a first side (340) facing the battery cell (200) and a second side (350) away from the battery cell (200). The first interface (310), the indicator (320) and the switch (330) are all located on the second side (350), with the first interface (310) located at the edge of the second side (350), the switch (330) located in the middle of the second side (350), and the indicator (320) located on the side of the switch (330) away from the first interface (310).

3. The battery pack according to claim 1, characterized in that, The indicator (320) includes a plurality of LEDs arranged in an arc around the center of the switch (330).

4. The battery pack according to claim 2, characterized in that, The circuit board (300) is electrically connected to the positive terminal (210) of the battery cell (200), and the circuit board (300) is electrically connected to the negative terminal (220) of the battery cell (200) through a second lead (600). The second lead (600) is connected to the edge of the circuit board (300), and the second lead (600) is arranged adjacent to the first lead (500).

5. The battery pack according to claim 4, characterized in that, The circuit board (300) is also connected to a temperature signal detection terminal (360), which is located at the edge of the circuit board (300), and the first interface (310), the indicator (320), and the temperature signal detection terminal (360) are arranged in a first straight line (700).

6. The battery pack according to claim 5, characterized in that, The positive electrode connector (230) is arranged adjacent to the positive terminal (210), and the negative electrode connector (240) is arranged adjacent to the second lead (600). The positive electrode connector (230) and the negative electrode connector (240) are both located at the edge of the circuit board (300), and the positive electrode connector (230), the switch (330) and the negative electrode connector (240) are arranged in a second straight line (800). The second straight line (800) is perpendicular to the first straight line (700).

7. The battery pack according to claim 6, characterized in that, The circuit board (300) is also connected to a charge / discharge MOSFET (370), a lithium battery protection center (380), and a charging chip (390). The charge / discharge MOSFET (370), the lithium battery protection center (380), and the charging chip (390) are all located on the first side (340), and the charging chip (390) is located in the middle of the first side (340). The charge / discharge MOSFET (370) is located between the charging chip (390) and the negative electrode connecting piece (240), and the lithium battery protection center (380) is located between the charging chip (390) and the temperature signal detection terminal (360).

8. The battery pack according to claim 2, characterized in that, The second side (350) is also connected to a power display chip (351) and a short-circuit fuse (352). The power display chip (351) is disposed adjacent to the indicator (320), and the short-circuit fuse (352) is disposed adjacent to the first interface (310).

9. The battery pack according to claim 2, characterized in that, A support block (1000) is provided between the first side (340) and the battery cell (200).

10. An electric tool, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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