Battery device

Abstract

The present invention relates to a battery device, comprising a housing and a battery pack contained in the housing; the battery device also comprises a safety mechanism that responds to the expansion amount of the battery pack, the safety mechanism having a first mechanical switch, a second mechanical switch and a third switch connected to a circuit board, the first mechanical switch and the third switch acting together to reversibly interrupt the current of the battery device when the battery pack reaches a first expansion thickness, and the second mechanical switch is used to irreversibly interrupt the current of the battery device when the battery pack reaches a second expansion thickness. The present invention provides a first mechanical switch and a second mechanical switch on a main current circuit, which respond to the expansion of the battery pack, thereby limiting the current of a charging device in stages; and a temperature sensing element can be provided on the second mechanical switch, so that the third switch on the main circuit reversibly interrupts the battery device according to the temperature detected by the temperature sensing element, so as to extend its service life.

Description

[Technical field]

[0001] The present invention relates to a battery device, in particular to a battery device for providing electric energy to equipment. [Background technology]

[0002] Based on the demand for portability, more and more devices currently use battery devices as a power source.

[0003] At present, batteries mainly have three structures: cylindrical, square, and soft pack. Existing battery devices used to power equipment mostly use cylindrical lithium batteries, and multiple cylindrical lithium batteries are connected in series and parallel to ensure sufficient power output to improve the endurance of the equipment. However, the process of cylindrical lithium batteries is complicated and the positive and negative electrodes are placed at both ends, which is extremely unfavorable for the wiring harness layout and overall design of the battery device. In addition, there are very large electrical safety hazards because the shell material is steel.

[0004] In addition, the battery device composed of square aluminum shell batteries is large in size and heavy in weight, and has low space utilization compared to battery devices with fixed size requirements, which is not conducive to the expansion of battery device capacity and the overall design of the system;

[0005] Soft-pack batteries have many advantages, such as small size, light weight, high specific energy, high safety, and flexible design. Based on these advantages, they are currently used in terminals such as mobile phones and headphones in the electronics industry, as well as electric products such as electric vehicles, electric bicycles, and electric motorcycles.

[0006] At present, the new energy power battery industry will develop towards high energy density, so assembling soft-pack batteries into battery devices will become the future development trend of power batteries.

[0007] However, soft-pack batteries will swell after being used to a certain extent. As the use time of soft-pack batteries increases, they are prone to abuse and exceeding their service life, causing the soft-pack batteries to swell. When the expansion of the soft-pack batteries exceeds the expansion threshold and continues to be used, the performance parameters of the soft-pack batteries will drop sharply, and they are prone to cause safety problems such as combustion and explosion, resulting in casualties.

[0008] Furthermore, even though the risk of using soft-pack batteries that exceed the expansion threshold is so great, the existing technology still lacks an effective method to effectively detect whether the expansion amplitude of the soft-pack batteries exceeds the expansion threshold. Even if there is a method to detect the expansion of soft-pack batteries, its structure is relatively complex and the implementation cost is relatively high, and it cannot be promoted in different industries.

[0009] For the description of the above structure, please refer to the Chinese invention patent No. CN112262497B published on January 26, 2024, which discloses a battery pack having a current interrupter for at least temporarily interrupting the current of a soft-pack battery cell. The current interrupter is configured with a predetermined breaking point through the expansion of the soft-pack battery cell, resulting in the disconnection of the current circuit. However, the current interrupter cannot utilize the expansion of the soft-pack battery itself to achieve graded current limitation of the battery pack, making it difficult to extend the service life of the battery pack.

[0010] In view of this, it is indeed necessary to provide an improved battery device to overcome the defects of the prior art. [Summary of the invention]

[0011] In view of the shortcomings of the prior art, an object of the present invention is to provide a safe and reliable battery device.

[0012] The present invention solves the problems of the prior art by adopting the following technical solutions: a battery device, comprising a shell and a battery pack accommodated in the shell; the battery device also comprises a safety mechanism responsive to the expansion amount of the battery pack, the safety mechanism comprising a first mechanical switch, a second mechanical switch, a third switch and a temperature sensing element connected to a circuit board, the first mechanical switch, the third switch and the temperature sensing element acting together to reversibly interrupt the current of the battery device when the battery pack reaches a first expansion thickness, and the second mechanical switch is used to irreversibly interrupt the current of the battery device when the battery pack reaches a second expansion thickness.

[0013] A further improved solution is: the first mechanical switch and the second mechanical switch are connected to the circuit board in parallel.

[0014] A further improvement scheme is: the first mechanical switch has a first plug-in and a second plug-in respectively fixed to the circuit board, and the ends of the first plug-in and the second plug-in away from the circuit board are abutted; the second mechanical switch has a third plug-in and a fourth plug-in respectively fixed to the circuit board, and the ends of the third plug-in and the fourth plug-in away from the circuit board are abutted.

[0015] A further improved solution is that the third plug and the fourth plug are located between the first plug and the second plug, and the contact portion of the first plug and the second plug is closer to the battery pack than the contact portion of the third plug and the fourth plug.

[0016] A further improvement is that the safety mechanism has a plug-in component fixed to the battery pack, and when the battery pack is in the first expanded thickness, the plug-in component moves toward the circuit board and is inserted between the first plug-in piece and the second plug-in piece; when the battery pack is in the second expanded thickness, the plug-in component further moves toward the circuit board and is inserted between the third plug-in piece and the fourth plug-in piece.

[0017] A further improved solution is: the plug-in component is made of an insulating sheet, and the first plug-in sheet, the second plug-in sheet, the third plug-in sheet and the fourth plug-in sheet are made of a conductive material.

[0018] A further improvement is that the safety mechanism also has a temperature sensing element connected to the third switch, the temperature sensing element is installed on the second mechanical switch, and when the temperature of the second mechanical switch exceeds a preset temperature value T1, the third switch reversibly interrupts the current of the battery device.

[0019] A further improved solution is: the second mechanical switch further has a hole penetrating the third plug and a fuse area adjacent to the hole, and the temperature sensing element is located in the fuse area.

[0020] A further improvement is that: the third switch is a switch tube.

[0021] The present invention solves the problems of the prior art by adopting the following technical solutions: a battery device comprises a shell, a battery pack accommodated in the shell, a circuit board connected to the battery pack and an output terminal installed on the circuit board, wherein the battery pack, the circuit board and the output terminal constitute a current path; the battery device also comprises a safety mechanism arranged in the current path, wherein the safety mechanism and the output terminal are respectively located on both sides of the circuit board, wherein the safety mechanism comprises a first mechanical switch and a second mechanical switch connected to the circuit board and a plug-in component fixed to the battery pack, wherein the plug-in component extends toward the circuit board, wherein when the battery device is at an initial thickness, the first mechanical switch and the second mechanical switch are located together in the current path; when the battery device is at a first expanded thickness, the plug-in component is inserted into the first mechanical switch so that the first mechanical switch is disconnected and the second mechanical switch is located in the current path; when the battery device is at a second expanded thickness, the plug-in component is inserted into the first mechanical switch and the second mechanical switch so that the first mechanical switch and the second mechanical switch are disconnected and the battery device fails.

[0022] Compared with the prior art, the present invention has the following beneficial effects: by arranging a first mechanical switch and a second mechanical switch on the main current circuit, which responds to the expansion of the battery pack, the current of the charging device is limited in stages; and a temperature sensing element can be arranged on the second mechanical switch, so that the third switch on the main circuit can reversibly interrupt the battery device according to the temperature detected by the temperature sensing element, so as to extend its service life.

Brief Description of the Drawings

[0023] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the battery device of the present invention;

[0025] Figure 2 yes Figure 1 a disassembled view of the battery device shown;

[0026] Figure 3 yes Figure 2 A schematic diagram of the structure of a battery pack in the battery device shown;

[0027] Figure 4 yes Figure 2 A schematic diagram of the structure of the adapter board in the battery device shown;

[0028] Figure 5 yes Figure 1 A cross-sectional view of a battery pack in the battery device shown at an initial thickness;

[0029] Figure 6 yes Figure 5 A partial enlarged view of the safety mechanism in the battery device shown;

[0030] Figure 7 yes Figure 5 A cross-sectional view of a battery pack in the battery device shown in a first expanded thickness;

[0031] Figure 8 yes Figure 7 A partial enlarged view of the safety mechanism in the battery device shown;

[0032] Fig. 9 yes Figure 5 A cross-sectional view of a battery pack in the battery device shown in a second expanded thickness;

[0033] Fig.10 yes Fig. 9 A partial enlarged view of the safety mechanism in the battery device shown;

[0034] Fig.11 yes Figure 2 A schematic diagram of the structure of the safety mechanism in the battery device shown;

[0035] Fig.12 yes Figure 1 Electrical schematic of the battery arrangement shown. [Specific implementation method]

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0037] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the following words indicating orientation or positional relationship, such as "upper", "lower", "front", "back", "left", "right", etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0038] See also Figure 1 and Figure 2 As shown, the embodiment of the present invention relates to a battery device 100, whose voltage is generally 12V, 24V, 36V, 48V, 56V or 80V. In order to facilitate the description of the technical solution of the present invention, the following definitions are made: Figure 1 The battery device 100 includes a housing 1 and a battery pack 2 accommodated in the housing 1 .

[0039] Wherein, the shell 1 includes an upper shell 11 and a lower shell 12 assembled at the interface to form an inner cavity. The shell 1 is composed of a first material, specifically, the first material is a thermoplastic material, such as polyethylene plastic, polyvinyl chloride plastic, etc. The shell 1 is assembled by the upper shell 11 and the lower shell 12 to form an inner cavity to accommodate the battery pack 2. The shell 1 is at least partially formed with a coupling portion 13 for connecting the battery device 100 to the power tool, and the battery device 100 can be connected to the power tool in the front-to-back direction. Specifically, a coupling portion 13 is formed on the upper surface of the shell 1, and the coupling portion 13 can match with the adapter portion of the power tool so that the battery device 100 can be detachably attached to the power tool along the installation direction. In some embodiments, the coupling portion 13 is provided with a pair of guide rails 131.

[0040] In this embodiment, the battery pack 2 is disposed in the inner cavity formed by the housing 1. The battery pack 2 includes a plurality of soft-pack battery cells, which are connected in series, in parallel, or in series and parallel to form the battery pack 2. In some embodiments, the voltage of a single soft-pack battery cell is 4.2V.

[0041] The energy density of the battery pack 2 has a value range of greater than 150Wh / kg. Optionally, the energy density of the battery pack 2 has a value range of 150Wh / kg to 200Wh / kg. Optionally, the energy density of the battery pack 2 has a value range of greater than 200Wh / kg.

[0042] In some embodiments, the internal resistance of the battery device 100 is less than or equal to 10 mΩ. Optionally, the internal resistance of the battery device 100 is less than or equal to 6 mΩ. Optionally, the internal resistance of the battery device 100 is less than or equal to 3 mΩ.

[0043] In some embodiments, the discharge current of the battery device 100 is greater than or equal to 20A. Optionally, the discharge current of the battery device 100 is greater than or equal to 40A. Optionally, the discharge current of the battery device 100 is greater than or equal to 60A. Optionally, the discharge current of the battery device 100 is greater than or equal to 80A. Optionally, the discharge current of the battery device 100 is greater than or equal to 100A. Optionally, the discharge current of the battery device 100 is greater than or equal to 120A.

[0044] Specifically, the soft-pack battery cell is in a flat bag-shaped structure, and a plurality of soft-pack battery cells are stacked and arranged in sequence along the up-down direction. In some embodiments, the soft-pack battery cell can also be bent into an arc shape.

[0045] Combination Figure 3 and Figure 4 As shown, the battery pack 2 in this embodiment is composed of five soft-pack battery cells, namely a first soft-pack battery cell 21, a second soft-pack battery cell 22, a third soft-pack battery cell 23, a fourth soft-pack battery cell 24 and a fifth soft-pack battery cell 25, and the above soft-pack battery cells have the same shape and structure.

[0046] Among them, taking the first soft-pack battery cell 21 as an example, it has a core body 211 that is roughly flat and square, an aluminum-plastic film 212 covering the core body 211, and a first positive contact tab 213 and a first negative contact tab 214 connected to the core body 211 and protruding out of the aluminum-plastic film 212. The first positive contact tab 213 and the first negative contact tab 214 are located at the end of the first soft-pack battery cell 21. The tabs are mainly composed of the first positive contact tab 213 and the first negative contact tab 214. In some embodiments, the first positive contact tab 213 and the first negative contact tab 214 are distributed on the same side of the battery device 100. Optionally, the first positive contact tab 213 and the first negative contact tab 214 are located on the front side of the battery device 100. Optionally, the first positive contact tab 213 and the first negative contact tab 214 are located on the rear side of the battery device 100. In some embodiments, the first positive contact tab 213 and the first negative contact tab 214 are distributed on opposite sides of the battery device 100. Optionally, the first positive contact tab 213 is located on the front side of the battery device 100, and the first negative contact tab 214 is located on the rear side of the battery device 100. Optionally, the first positive contact tab 213 is located on the rear side of the battery device 100, and the first negative contact tab 214 is located on the front side of the battery device 100.

[0047] In this embodiment, the second soft-pack battery cell 22 , the third soft-pack battery cell 23 , the fourth soft-pack battery cell 24 and the fifth soft-pack battery cell 25 also have the above-mentioned core body, aluminum-plastic film, positive contact tab and negative contact tab.

[0048] Among them, the second soft-pack battery cell 22 has a core, an aluminum-plastic film, a second positive contact ear 223 and a second negative contact ear 224; the third soft-pack battery cell 23 has a core, an aluminum-plastic film, a third positive contact ear 233 and a third negative contact ear 234; the fourth soft-pack battery cell 24 has a core, an aluminum-plastic film, a fourth positive contact ear 243 and a fourth negative contact ear 244; the fifth soft-pack battery cell 25 has a core, an aluminum-plastic film, a fifth positive contact ear 253 and a fifth negative contact ear 254.

[0049] Figure 4 The multiple soft-pack battery cells in the battery pack 2 shown are arranged in a flipped stack, that is, the second soft-pack battery cell 22 and the fourth soft-pack battery cell 24 are arranged by flipping the first soft-pack battery cell 21 by 180°, and the third soft-pack battery cell 23 and the fifth soft-pack battery cell 25 are replicas of the first soft-pack battery cell 21.

[0050] Specifically, ten pole tabs are arranged along the stacking direction to form a first pole tab group 2a and a second pole tab group 2b respectively. The first pole tab group 2a is mainly composed of a first positive contact pole tab 213, a second negative contact pole tab 224, a third positive contact pole tab 233, a fourth negative contact pole tab 244 and a fifth positive contact pole tab 253, and the multiple pole tabs in the first pole tab group 2a are aligned; the second pole tab group 2b is mainly composed of a first negative contact pole tab 214, a second positive contact pole tab 223, a third negative contact pole tab 234, a fourth positive contact pole tab 243 and a fifth negative contact pole tab 254, and the multiple pole tabs in the second pole tab group 2a are aligned.

[0051] In this embodiment, the battery device 100 further includes a holding bracket 3 for mounting the battery pack 2, an adapter plate 4 and a connecting piece 5 for connecting the tabs, a circuit board 7 located above the holding bracket 3, and an output terminal 8 fixed to the upper surface of the circuit board 7, and the output terminal 8 is electrically connected to the circuit board 7. The tabs are fixed on the adapter plate 4 for series connection, and the first positive contact tab 213 and the fifth negative contact tab 254 of the battery pack 2 are electrically connected to the circuit board 7 through the connecting piece 5, so that the output terminal 8 can output the electric energy of the battery pack 2.

[0052] The holding bracket 3 has a frame 31, a through slot 32 penetrating the frame 31, and a slot 33 formed on the frame 31. Optionally, the frame 31 has a front wall, an upper wall, a lower wall, a left wall, and a right wall. Optionally, the frame 31 has a front wall, an upper wall, a left wall, and a right wall. The frame 31 has a front wall, an upper wall, a lower wall, a left wall, and a right wall.

[0053] The adapter plate 4 has an insulating substrate 41, 6 metal parts 42 embedded in the insulating substrate 41, 10 tab slots 43 penetrating the insulating substrate 41, and a stopper 44 protruding from the insulating substrate 41. The metal parts 42 are at least partially exposed to the outside of the insulating substrate 41, so that the tabs are electrically connected through the metal parts 42. The stopper 44 is located between two metal parts 42 to prevent the tabs from short-circuiting.

[0054] Specifically, the metal part 42 has a first metal part 421, a second metal part 422, a third metal part 423, a fourth metal part 424, a fifth metal part 425 and a sixth metal part 426; the pole lug slot 43 has a first pole lug slot 431, a second pole lug slot 432, a third pole lug slot 433, a fourth pole lug slot 434, a fifth pole lug slot 435, a sixth pole lug slot 436, a seventh pole lug slot 437, an eighth pole lug slot 438, a ninth pole lug slot 439 and a tenth pole lug slot 440.

[0055] Further, the first positive contact pole ear 213 passes through the first pole ear slot 431 and is folded upward and welded to the first metal part 421; the first negative contact pole ear 214 passes through the second pole ear slot 432 and is folded downward and welded to the second metal part 422, and the second positive contact pole ear 223 passes through the third pole ear slot 433 and is folded upward and welded to the second metal part 422; the second negative contact pole ear 224 passes through the fourth pole ear slot 434 and is folded upward and welded to the third metal part 423, and the third positive contact pole ear 233 passes through the fifth pole ear slot 435 and is folded upward and welded to the third metal part 423; the third negative contact pole ear 234 passes through the sixth pole ear slot 436 and is folded downward and welded to the fourth The fourth positive contact pole ear 243 passes through the seventh pole ear slot 437 and is folded upward and welded to the fourth metal part 424; the fourth negative contact pole ear 244 passes through the eighth pole ear slot 438 and is folded upward and welded to the fifth metal part 425, and the fifth positive contact pole ear 253 passes through the ninth pole ear slot 439 and is folded upward and welded to the fifth metal part 425; the fifth negative contact pole ear 254 passes through the tenth pole ear slot 440 and is folded downward and welded to the tenth pole ear slot 440, so that the first soft-pack battery cell 21, the second soft-pack battery cell 22, the third soft-pack battery cell 23, the fourth soft-pack battery cell 24 and the fifth soft-pack battery cell 25 are connected in series. Optionally, the welding of the two pole ears and the metal part adopts stack welding. Optionally, the two pole ears are respectively welded to a part of the metal part.

[0056] In this embodiment, the connecting piece 5 is a copper connecting piece, which has a positive connecting piece 51 and a negative connecting piece 52, wherein one end of the positive connecting piece 51 is electrically connected to the first metal member 421, and the other end is electrically connected to the circuit board 7, so that the first positive contact tab 213 is connected to the circuit board 7 via the positive connecting piece 51; one end of the negative connecting piece 52 is electrically connected to the sixth metal member 426, and the other end is electrically connected to the circuit board 7, so that the fifth negative contact tab 254 is connected to the circuit board 7 via the negative connecting piece 52. In some embodiments, the connecting piece 5 can be a conductor element such as a wire.

[0057] Combination Figures 5 to 12 As shown, the battery pack 2, the circuit board 7 and the conductive terminal 8 constitute a current path. In order to protect the safety of the battery pack 2, a safety mechanism 6 is set on the main loop of the current path, so that the safety mechanism 6 responds to the expansion amount of the battery pack 2 and limits the current of the battery pack 2 in stages. Specifically, the safety mechanism 6 is located on the lower end surface of the circuit board 7, and the safety mechanism 6 and the output terminal 8 are respectively located on both sides of the circuit board 7. The safety mechanism 6 is set on the lower end surface, which is advantageous for providing feedback according to the expansion state of the battery pack 2.

[0058] Since the battery pack 2 will expand after being used to a certain extent, the battery pack 2 is set to have an initial thickness, a first expansion thickness and a second expansion thickness. The second expansion thickness is a critical state of the battery pack 2, that is, beyond the critical state, the battery pack 2 has a higher safety risk and is not suitable for continued use; the expansion amount of the first expansion thickness is 50% to 80% of the expansion amount of the second expansion thickness; the expansion amount of the initial thickness is 0.

[0059] Specifically, the thickness of the battery pack 2 at the initial thickness is D, corresponding to a healthy state; the thickness of the battery pack 2 at the first expanded thickness is 1.05D, and the expansion amount is 5%, corresponding to a sub-healthy state; the thickness of the battery pack 2 at the second expanded thickness is 1.1D, and the expansion amount is 10%, corresponding to a failure state. Figure 5 and Figure 6 The battery pack 2 shown is the initial thickness, Figure 7 and Figure 8 The battery pack 2 shown is a first expanded thickness. Fig. 9 and Fig.10 The battery pack 2 is shown in a second expanded thickness.

[0060] In this embodiment, the safety mechanism 6 comprises a first mechanical switch 61, a second mechanical switch 62 and a third switch 64 connected to the circuit board 7, a temperature sensing element 63 connected to the third switch 64 and a plug-in member 65 fixed to the battery pack 2. The first mechanical switch 61 and the second mechanical switch 62 are switched on and off in response to the expansion amount of the battery pack 2. In this embodiment, the first mechanical switch 61 and the third switch 64 work together to reversibly interrupt the current of the battery device 100 when the battery pack 2 reaches the first expansion thickness; the second mechanical switch 62 is used to irreversibly interrupt the current of the battery device 100 when the battery pack 2 reaches the second expansion thickness.

[0061] The first mechanical switch 61 and the second mechanical switch 62 are made of conductive material. Optionally, the conductive material is a metal material such as copper alloy, silver alloy, nickel alloy, etc. The plug-in component 65 is made of insulating material. Optionally, the insulating material is plastic.

[0062] The temperature sensing element 63 is fixed on the second mechanical switch 62, and is configured to detect the temperature of the second mechanical switch 62 and transmit the temperature information to the third switch 64. Optionally, the third switch 64 is a switch tube.

[0063] The plug-in component 65 has a fitting surface 651 connected to the battery pack 2 and a plug-in piece 652 extending vertically upward from the plug-in component 65. The fitting surface 651 is fixed to the upper end surface of the battery pack 2 through the card slot 33. The fitting surface 651 is directly attached to the battery pack 2, so that the plug-in component 65 can move synchronously with the battery pack 2. The plug-in piece 652 is arranged corresponding to the position of the first mechanical switch 61 and the second mechanical switch 62. In the up-down direction, the plug-in piece 652, the first mechanical switch 61 and the second mechanical switch 62 are aligned.

[0064] The first mechanical switch 61 and the second mechanical switch 63 are connected in parallel to the main circuit of the circuit board 7 to control the on and off of the main circuit of the battery device 100. The third switch 64 controls the on and off of the main circuit of the battery device 100 according to the temperature information of the temperature sensing element. The plug-in piece 652 controls the on and off of the first mechanical switch 61 and the second mechanical switch 63.

[0065] When the battery pack 2 is in Figure 6 At the initial thickness shown, the connector 652 is not displaced, and no operation is performed on the first mechanical switch 61. The first mechanical switch 61 and the second mechanical switch 62 are both connected to the main circuit, and current can flow on the path of the first mechanical switch 61 and the second mechanical switch 62. At this time, the battery pack 2 is in a healthy state and can be used for processing operations of high-power power tools for a long time.

[0066] When the battery pack 2 is in Figure 8 When the first expansion thickness is shown, the plug-in piece 652 moves upward and is inserted into the first mechanical switch 61, and the first mechanical switch 61 is turned off, so that the circuit where the first mechanical switch 61 is located is disconnected, and the current flows only on the path of the second mechanical switch 62. At this time, the battery pack 2 is in a sub-healthy state, which is suitable for use in low-power power tools and short-time high-power power tools.

[0067] Further, a third switch 64 is provided on the main circuit of the circuit board 7 to prevent the sub-healthy battery pack 2 from being used for a high-power electric tool for a long time. The third switch 64 is connected to the temperature sensing element 63 by a wire. The temperature sensing element 63 detects the temperature of the second mechanical switch 62. When the temperature of the second mechanical switch 62 exceeds the preset temperature value T1, the third switch 64 reversibly interrupts the current of the battery device 100, and when the temperature of the second mechanical switch 62 is lower than the preset temperature value T1, the battery device 100 resumes use. The high-power application scenario of the battery device 100 is limited by the temperature sensing element 63 and the second mechanical switch 62 to prevent the malignant situation of further rapid increase in the expansion amount caused by the excessive temperature of the battery pack 2, thereby extending the service life of the battery device 100. Optionally, the preset temperature value T1 is 60°C to 100°C. Optionally, the preset temperature value T1 is 70°C to 90°C. Optionally, the preset temperature value T1 is 70°C. Optionally, the preset temperature value T1 is 80°C. Optionally, the preset temperature value T1 is 85°C.

[0068] When the battery pack 2 is in Fig.10 When the second expansion thickness is reached, the plug-in piece 652 continues to move upward and is inserted into the second mechanical switch 62, and the first mechanical switch 61 and the second mechanical switch 62 are both turned off. The current of the battery device 100 is interrupted, and the battery device 100 fails. The battery pack 2 that has reached the second expansion thickness is no longer suitable for continued use, and the current loop of the battery device 100 is disconnected to protect the personal safety of the operator.

[0069] In this embodiment, the first mechanical switch 61 comprises a first plug-in sheet 611 and a second plug-in sheet 612 respectively fixed to the circuit board 7, a first isolation portion 613 located at the upper end, a first opening portion 615 located at the lower end, and a first contact portion 614 located between the first isolation portion 613 and the first opening portion 615. Specifically, the first isolation portion 613 is the upper end portion of the first plug-in sheet 611 and the second plug-in sheet 612, and the two maintain a certain distance; the first contact portion 614 is the middle portion of the first plug-in sheet 611 and the second plug-in sheet 612, and the two are in contact with each other; the first opening portion 615 is the lower end portion of the first plug-in sheet 611 and the second plug-in sheet 612, and the two are at a certain angle.

[0070] The second mechanical switch 62 comprises a third plug-in piece 621 and a fourth plug-in piece 622 respectively fixed to the circuit board 7, a second isolation portion 625 at the upper end, a second opening portion 627 at the lower end, a second contact portion 626 between the second isolation portion 625 and the second opening portion 627, and a hole 623 penetrating the third plug-in piece 621 and a fuse region 624 adjacent to the hole 623. Specifically, the second isolation portion 625 is the upper end of the third plug-in piece 621 and the fourth plug-in piece 622, and the two keep a certain distance; the second contact portion 626 is the middle portion of the third plug-in piece 621 and the fourth plug-in piece 622, and the two are in contact with each other; the second opening portion 627 is the lower end of the third plug-in piece 621 and the fourth plug-in piece 622, and the two are at a certain angle.

[0071] The third plug-in sheet 621 and the fourth plug-in sheet 622 are both located between the first plug-in sheet 611 and the second plug-in sheet 612, and the second contact portion 626 is located at the upper end of the first contact portion 614, so that the plug-in sheet 652 can first move upward and be inserted between the first plug-in sheet 611 and the second plug-in sheet 612, and then continue to move upward and be inserted between the third plug-in sheet 621 and the fourth plug-in sheet 622. Specifically, when the battery pack 2 is at the first expanded thickness, the plug-in sheet 652 can first move upward and be inserted between the first plug-in sheet 611 and the second plug-in sheet 612; when the battery pack 2 is at the second expanded thickness, it continues to move upward and be inserted between the third plug-in sheet 621 and the fourth plug-in sheet 622.

[0072] Optionally, the temperature sensing element 63 is located in the fuse area 624. The hole 623 is used to concentrate heat so that the temperature of the fuse area 624 is higher than the temperature of other areas of the third plug 621. On the other hand, the hole 623 can prevent the charging device 100 from short-circuiting and directly fuse to disconnect the circuit.

[0073] The present invention provides a first mechanical switch 61 and a second mechanical switch 62 on the main current circuit, which respond to the expansion of the battery pack 2, thereby limiting the current of the charging device 100 in stages; and a temperature sensing element 63 can be provided on the second mechanical switch 62, so that the third switch 64 on the main circuit can reversibly interrupt the battery device 100 according to the temperature detected by the temperature sensing element 63, so as to extend its service life.

[0074] The present invention is not limited to the above specific embodiments. A person skilled in the art can easily understand that there are many other alternatives to the battery device of the present invention without departing from the principle and scope of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. A battery device, comprising a housing and a battery pack received in the housing; characterized in that: The battery device also includes a safety mechanism responsive to the amount of expansion of the battery pack, the safety mechanism having a first mechanical switch connected to a circuit board, a second mechanical switch, a third switch and a temperature sensing element, and a plug-in component fixed to the battery pack, the first mechanical switch, the third switch and the temperature sensing element working together to reversibly interrupt the current of the battery device when the battery pack reaches a first expansion thickness, the plug-in component moves and inserts the first mechanical switch, the first mechanical switch is turned off, and the temperature sensing element detects the temperature of the second mechanical switch, when the temperature of the second mechanical switch exceeds a preset temperature value, the third switch interrupts the current of the battery device, and when the temperature of the second mechanical switch is lower than the preset temperature value, the battery device resumes use; the second mechanical switch is used to irreversibly interrupt the current of the battery device when the battery pack reaches a second expansion thickness, the plug-in component moves and inserts the second mechanical switch, and the second mechanical switch is turned off.

2. The battery device according to claim 1, characterized in that: The first mechanical switch and the second mechanical switch are connected to the circuit board in parallel.

3. The battery device according to claim 2, characterized in that: The first mechanical switch has a first plug-in and a second plug-in respectively fixed to the circuit board, and the ends of the first plug-in and the second plug-in away from the circuit board are abutted; the second mechanical switch has a third plug-in and a fourth plug-in respectively fixed to the circuit board, and the ends of the third plug-in and the fourth plug-in away from the circuit board are abutted.

4. The battery device according to claim 3, characterized in that: The third plug-in sheet and the fourth plug-in sheet are located between the first plug-in sheet and the second plug-in sheet, and the contact portions of the first plug-in sheet and the second plug-in sheet are closer to the battery pack than the contact portions of the third plug-in sheet and the fourth plug-in sheet.

5. The battery device according to claim 3, characterized in that: When the battery pack is at the first expanded thickness, the plug-in member moves toward the circuit board and is inserted between the first plug-in sheet and the second plug-in sheet; when the battery pack is at the second expanded thickness, the plug-in member further moves toward the circuit board and is inserted between the third plug-in sheet and the fourth plug-in sheet.

6. The battery device according to claim 5, characterized in that: The plug-in component is made of an insulating sheet, and the first plug-in sheet, the second plug-in sheet, the third plug-in sheet and the fourth plug-in sheet are made of a conductive material.

7. The battery device according to claim 6, characterized in that: The temperature sensing element is connected to the third switch, and the temperature sensing element is mounted on the second mechanical switch. When the temperature of the second mechanical switch exceeds a preset temperature value T1, the third switch reversibly interrupts the current of the battery device.

8. The battery device according to claim 7, characterized in that: The second mechanical switch also has a hole penetrating the third plug and a fuse area adjacent to the hole, and the temperature sensing element is located in the fuse area.

9. The battery device according to claim 1, characterized in that: The third switch is a switch tube.

10. A battery device, comprising a housing, a battery pack housed in the housing, a circuit board connected to the battery pack, and an output terminal mounted on the circuit board, wherein the battery pack, the circuit board, and the output terminal constitute a current path; characterized in that: The battery device also includes a safety mechanism arranged in the main loop of the current path, the safety mechanism and the output terminal are respectively located on both sides of the circuit board, the safety mechanism has a first mechanical switch and a second mechanical switch connected to the circuit board and a plug-in component fixed to the battery pack, the plug-in component extends toward the circuit board, and the plug-in component has a fitting surface connected to the battery pack and a plug-in piece extending upward from the fitting surface, when the battery device is at an initial thickness, the first mechanical switch and the second mechanical switch are jointly located in the current path; when the battery device is at a first expanded thickness, the plug-in piece moves toward the circuit board and is inserted into the first mechanical switch so that the first mechanical switch is disconnected and the second mechanical switch is located in the current path; when the battery device is at a second expanded thickness, the plug-in piece moves toward the circuit board and is inserted into the first mechanical switch and the second mechanical switch so that the first mechanical switch and the second mechanical switch are disconnected, and the battery device fails.

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