TWI393319B - Automatic circuit breaker for preventing overcharge of battery and battery unit having the same - Google Patents

Description

Battery overcharge automatic power off device and battery thereof

The invention relates to an automatic power-off of a battery, in particular to a battery over-charge automatic power-off device and a battery having the overcharge automatic power-off device.

According to the popularization and high performance of mobile electronic devices, batteries with high energy density are expected. Under this background, the electrochemical doping and dedoping of carbon, which can be used as the negative active material lithium, is used. Materials, and lithium ion batteries using lithium-containing transition metal compounds as positive electrode active materials are rapidly becoming popular.

However, in such a secondary lithium battery, if the battery is overcharged, an overcharged state is formed, excess lithium ions are extracted from the positive electrode, and lithium ions are excessively inserted into the negative electrode to precipitate lithium metal, and lithium ions are lost. On the positive side, a very unstable high oxide will be formed. When the battery voltage under overcharge rises above a specific voltage value, the organic solvent of the electrolytic solution is decomposed, and a large amount of flammable gas is generated, and a rapid exothermic reaction occurs, causing abnormal heat generation of the battery. As a result, there is a problem that the safety of the battery is impaired; for the reason described above, the present inventors have made this problem and made innovations.

A protective structure for a rechargeable battery is known, such as the patents TWM292169 and TWM275625, which are hereby incorporated by reference. The abnormality detecting circuit checks the voltage of the rechargeable battery and outputs a detection signal; and the optical coupling The circuit is electrically coupled to the abnormality detecting circuit, and adjusts an impedance of the optical coupling circuit according to the detection signal to disconnect the rechargeable battery from the external circuit or discharge or charge the rechargeable battery. Another TWM275625 patent also discloses a protection structure for a rechargeable battery, which mainly includes a first protection circuit and a second protection circuit, wherein the first protection circuit includes a main current load connected to the main circuit and the battery, and is connected to a thermocouple sensing switch of the battery and the main circuit; the second protection circuit includes a protection circuit and a heater, the protection circuit is connected to the main circuit and detects a comparison battery voltage output activation signal, and the heater is connected to the protection circuit. The heating operation is initiated with respect to the aforementioned thermocouple sensing switch. Moreover, the mechanical protection device generally used for the cylindrical hard-shell lithium battery is that when the lithium battery is overcharged, the internal pressure is increased to start the pressure relief valve, and the internal pressure of the battery is broken by the action of the pressure relief valve. Conductive handle.

However, the aforementioned lithium battery overcharge protection structure can have a certain degree of protection for overcharging of the battery, but the components and circuits are inevitably damaged and lost due to long-term use. The mechanical safety protection device of the cylindrical hard-shell lithium battery cannot be used for the soft-shell lithium battery; and the various protection structures or devices described above are quite complicated and cumbersome in terms of component combination and configuration; If the above-mentioned components or circuits are damaged, the battery can be safely powered off, and the problem of high cost can be overcome with a simple structure, which is a problem to be solved by the present invention.

In view of this, the creator is trying to improve and solve the above-mentioned shortcomings, and he has devoted himself to research and cooperates with the application of theory, and finally proposed a reasonable design and Effectively improve the above-mentioned creations.

The main object of the present invention is to provide a battery overcharge automatic power-off device and a battery thereof, which utilizes a volume expansion phenomenon caused by overcharging of a battery to cut off a series or parallel conductive loop to prevent overcharging. Security. This not only simplifies the overall structure but also greatly reduces the cost, and can effectively prevent the explosion of the battery and the significant damage caused by the battery.

In order to achieve the above object, the present invention provides a battery overcharge automatic power-off device, comprising an insulating frame, a conductive sheet and two conductive electrodes; wherein the insulating frame has a surrounding space surrounded by a frame edge. The two sides of the frame are provided with two oppositely disposed grooves, and the opposite side of the frame is provided with a flexible plate extending in the surrounding space, and the flexible plate is provided at the end. Opening, and opening a blade in a side of the end of the near flexible board; the conductive sheet has two halves in a folded shape, and a folded portion connecting the two is formed between the two halves, and the conductive sheet is placed in the flexible portion Inside the opening of the plate, the two halves are placed on the end of the flexible plate, and the folded portion is opposite to the edge of the flexible plate; the two conductive electrodes each have a guiding portion, and each of them is extended by the guiding portion thereof And the connecting portion, the guiding portions of the two guiding electrodes are respectively disposed in the two grooves of the insulating frame, and the two connecting portions are respectively electrically connected to the two halves of the conductive sheet to be fixedly combined; thereby, when When the batteries are stacked and connected in series or in parallel, The electric sheet and the two conductive electrodes can form a conductive loop, and once the battery is overcharged to expand its volume, the flexible sheet can be pushed to pull the conductive sheet, and the folded portion of the conductive sheet is cut through the blade to cut off the conductive sheet and the second guide. Electrode formation Conductive loop.

In order to achieve the above object, the present invention provides a battery having an overcharge automatic power-off device, including two power-off devices, and at least one battery; wherein each power-off device includes components as described above, and the battery has a body disposed in the surrounding space of the second power-off device, the main body is provided with a positive electric handle and a negative electric handle, and the positive and negative electric handles respectively correspond to the guiding portion of the second power-off device, and the second breaking The flexible board of the electrical device is attached to the surface of the battery body.

In order to achieve the above object, the present invention provides a battery having an overcharge automatic power-off device, including a power-off device, at least one battery, and a box base; wherein the power-off device includes the above components, and the battery also has a body disposed in the surrounding space of the power-off device, wherein the body is provided with a positive electric handle and a negative electric handle, and the positive and negative electric handles respectively correspond to the guiding portions of the two power-off devices, and the box base An accommodating space is formed therein, and the battery is accommodated in the accommodating space, and the power-off device is pressed on the surface of the battery body.

The detailed description of the present invention and the accompanying drawings are to be understood by the accompanying claims .

Please refer to the first figure, which is an exploded perspective view of the power-off device of the present invention. The invention provides a battery overcharge automatic power-off device and a battery thereof, the power-off device 1 is used for stacking with a battery 2 (as shown in the second figure), and then making a series connection and a parallel connection for the electrical connection. Battery 2 can be reached when overcharged The function of power off. The power-off device 1 comprises an insulating frame 10, a conductive sheet 12, and two conductive electrodes 13, 14; wherein:

The insulating frame 10 is made of an insulating material such as plastic, and has a frame edge 101 slightly larger than the body 20 of the battery 2, and a surrounding space 100 is formed therein for the battery 2 to be stacked. In the insulating frame 10. The two side walls 101 of the insulating frame 10 are provided with two grooves 102 and 103. The two grooves 102 and 103 are disposed in opposite directions, and are respectively disposed on the two guiding electrodes 13 and 14 to serve as positive Negative. In addition, the insulating frame 10 is provided with a flexible plate 11 extending toward the surrounding space 100 on the opposite side frame 101. The flexible plate 11 is provided with an opening 110 at the end, and the opening 110 is near A blade portion 111 is formed in one end of the end of the flexible board 11 for cutting off the conductive circuit when the battery 2 is overcharged.

The conductive sheet 12 is formed of a copper foil and has two halves 120 and 121 in a folded shape. A folded portion 122 connecting the two is formed between the two halves 120 and 121. The conductive sheet 12 is inserted into the opening 110 of the flexible board 11, and the two halves 120, 121 are sandwiched on the end of the flexible board 11 by folding the edge to make the folded portion 122 and the edge of the flexible board 11. The part 111 is opposite.

The two lead electrodes 13 and 14 can also be formed by a copper foil, and each of the lead electrodes 13 and 14 has a guiding portion 130, 140 disposed in the recesses 102, 103 of the insulating frame 10, and The connecting portions 131 and 141 extending from the guiding portions 130 and 140 are respectively connected, and the connecting portions 131 and 141 of the two conductive electrodes 13 and 14 are electrically connected to the two halves 120 and 121 of the conductive sheet 12, respectively. And fixedly combined; when the positive electrode handle 21 and the negative electrode handle 22 on the battery 2 are respectively in contact with the guiding portions of the second conductive electrodes 13, 14 When 130, 140, it can form a conductive loop.

In addition, the insulating frame 10 is provided with a fixing plate 15 protruding toward the flexible board 11 with respect to the side frame 101 of the flexible board 11, and the two halves 120 and 121 of the conductive sheet 12 are also interposed. The fixing plate 15 is provided with a through hole 150 in the fixing plate 15 for the two halves 120 and 121 of the conductive sheet 12 to adhere to each other through the through hole 150. In addition, the frame edge 101 of the insulating frame 10 is further provided with a corresponding positioning hole 16 and a positioning post 17 for the combination of the plurality of power-off devices 1 and the battery 2 to be stacked.

As shown in the second and third figures, the present invention is an embodiment in which the battery 2 is placed on the power-off device 1 by the second embodiment. The battery system has a body 20 of a flat plate. The top edge of the body 20 is provided with a positive electric handle 21 and a negative electric handle 22. The positive and negative electric handles 21 and 22 respectively correspond to the guide of the second power-off device 1. The joints 130, 140 (as shown in the third figure), so the two grooves 102, 103 for the guide portions 130, 140 must be arranged in the reverse direction. Referring to the fourth and fifth figures, the arrangement of the conductive sheet 12, the two conductive electrodes 13, 14 and the flexible board 11 can be clearly seen, and at the same time, the second power-off device The flexible board 11 is attached to the surface of the body 20 of the battery 2.

Therefore, the battery overcharge automatic power-off device and the battery thereof can be obtained by the above-described structural composition.

Accordingly, as shown in the sixth figure, when the battery 2 is overcharged and the volume of the body 20 is expanded, the flexible plate 11 can be pushed outward by the deformation caused by the volume expansion thereof to make the flexibility. The plate 11 pulls the conductive sheet 12; at this time, since the folded portion 122 of the conductive sheet 12 is attached to the edge of the flexible board 11 When the flexible plate 11 pulls the conductive sheet 12, the blade portion 111 cuts the folded portion 122, and the conductive loop formed by the conductive sheet 12 and the two conductive electrodes 13 and 14 is cut off. In this way, the power can be cut off and the dangers caused by overcharging can be avoided, thereby providing the safety of automatic power-off in overcharge.

Furthermore, as shown in FIG. 7 , when the plurality of batteries 2 are used in series or in parallel, the present invention can further extend the plurality of covers 3 outside the plurality of power-off devices 1 The power-off device 1 is interposed to increase the bonding strength between the power-off devices 1. And the hollow cover portion 30 opposite to the flexible plate 11 is formed on the two cover bodies 3, and the plurality of batteries 2 sandwiched by the power-off devices 1 can be provided to expand and deform the body 2 of the battery 2 after being overcharged and expanded. The space of the person.

FIG. 8 is a perspective exploded view and a perspective assembled view of another embodiment of the battery and power-off device of the present invention. The invention can also utilize a single power-off device 1 and cooperate with a box base 4 to integrate one or a plurality of batteries 2 connected in series or in parallel; wherein, this embodiment discloses another type of power-off device 1, the main difference The flexible board 11 and the fixing board 15 are disposed at opposite diagonal positions in the insulating frame 10, and the cutting edges of the flexible board 11 and the fixing board 15 are inclined, and the batteries 2 are permeable. They are stacked in series or in parallel to be loaded in the cassette holder 4. An accommodating space 40 is formed in the casing 4, and the height of the accommodating space 40 is exactly the same as the thickness of each of the batteries 2, so that the batteries 2 are accommodated therein, and the power-off device 1 is further disposed. It is assembled on the accommodating space 40 of the cassette holder 4 to be pressed over the respective batteries 2; since each battery 2 is pressed into the accommodating space 40 of the power-off device 1 and the cassette holder 4, when each battery 2 is over When filling and expanding, the flexible board 11 can be Pushing the conductive sheet 12 outward to cut the conductive sheet 12, so that the battery 2 can be automatically powered off when overcharged.

In summary, the present invention can achieve the intended use purpose, and solve the lack of the conventional, and because of the novelty and progress, fully meet the requirements of the invention patent application, and apply according to the patent law, please check and The patent in this case is granted to protect the rights of the inventor.

However, the above description is only a preferred embodiment of the present invention, and thus the scope of the present invention is not limited thereto, and the equivalent techniques and means, etc., which are used in the description of the present invention and the contents of the drawings, are the same. It is included in the scope of the present invention and is combined with Chen Ming.

<present invention>

1‧‧‧Power-off device

10‧‧‧Insulated frame

100‧‧‧Encircled space

101‧‧‧ frame side

102‧‧‧ Groove

103‧‧‧ Groove

11‧‧‧Flexible board

110‧‧‧ openings

111‧‧‧blade

12‧‧‧Conductive foil

120‧‧‧Half

121‧‧‧Half

122‧‧‧Folding

13‧‧‧Guide electrode

130‧‧‧Guidance

131‧‧‧Connecting Department

14‧‧‧conductive electrode

140‧‧‧Guidance

141‧‧‧Connecting Department

15‧‧‧ fixed board

150‧‧‧through hole

16‧‧‧Positioning holes

17‧‧‧Positioning column

2‧‧‧Battery

20‧‧‧ body

21‧‧‧ positive electric handle

22‧‧‧Negative electric handle

3‧‧‧ cover

30‧‧‧镂空部

4‧‧‧Box holder

40‧‧‧ accommodating space

The first figure is an exploded perspective view of the power-off device of the present invention.

The second figure is an exploded perspective view of the battery and power-off device of the present invention.

The third figure is a three-dimensional combination diagram of the battery and the power-off device of the present invention.

Figure 4 is a cross-sectional view taken along line 3-3 of the third figure.

The fifth figure is a partial enlarged view according to the fourth figure.

The sixth figure is a schematic diagram of automatic power-off after overcharging according to the fourth figure.

Figure 7 is a perspective exploded view of the present invention applied to serial/parallel connection.

Figure 8 is a perspective exploded view of another embodiment of the battery and power-off device of the present invention.

Figure 9 is a perspective assembled view of another embodiment of the battery and power-off device of the present invention.

1‧‧‧Power-off device

10‧‧‧Insulated frame

100‧‧‧Encircled space

101‧‧‧ frame side

102‧‧‧ Groove

103‧‧‧ Groove

11‧‧‧Flexible board

110‧‧‧ openings

111‧‧‧blade

12‧‧‧Conductive foil

120‧‧‧Half

121‧‧‧Half

122‧‧‧Folding

13‧‧‧Guide electrode

130‧‧‧Guidance

131‧‧‧Connecting Department

14‧‧‧conductive electrode

140‧‧‧Guidance

141‧‧‧Connecting Department

15‧‧‧ fixed board

150‧‧‧through hole

Claims (20)

A battery overcharge automatic power-off device comprises: an insulating frame body having a surrounding space surrounded by a frame edge, and two recessed grooves are arranged on one side of the frame side, and a flexible plate extending in the surrounding space is disposed on the opposite side of the frame, the flexible plate is provided with an opening at the end, and the opening is formed with a blade near the end of the flexible plate a conductive sheet having two halves in a folded shape, and a folded portion connecting the two halves to each other, the conductive sheet being inserted into the opening of the flexible board, and the two halves are a portion is disposed on the end of the flexible board, and the folded portion is opposite to the blade portion of the flexible board; and the two conductive electrodes each have a guiding portion, and each of the guiding portions extends therefrom a connecting portion, wherein the guiding portions of the two guiding electrodes are respectively disposed in the two grooves of the insulating frame, and the two connecting portions are respectively electrically connected to the two halves of the conductive sheet to be fixedly coupled; thereby, The conductive sheet and the two conductive electrodes are electrically connected in series or in parallel when stacked with the battery Forming a conductive loop, and once the battery is overcharged to expand its volume, the flexible board can be pushed to pull the conductive sheet, and the folded portion of the conductive sheet is cut through the blade portion to cut off the conductive sheet and the two conductive electrodes. The resulting conductive loop. The battery overcharge automatic power-off device according to the first aspect of the invention, wherein the insulating frame is provided with a fixing plate protruding toward the flexible plate with respect to a side frame side of the flexible plate, and The two halves of the conductive sheet are sandwiched on the fixing plate. The battery overcharge automatic power-off device according to item 2 of the patent application scope, The fixing plate is provided with a through hole, and the two halves of the conductive sheet are adhered to each other through the through hole. The battery overcharge automatic power-off device according to claim 1, wherein a corresponding positioning hole and a positioning post are disposed on a frame edge of the insulating frame. The battery overcharge automatic power-off device according to claim 1, wherein the conductive sheet is composed of a copper foil. The battery overcharge automatic power-off device according to claim 1 or 5, wherein the two conductive electrodes are respectively composed of a copper foil. A battery with an overcharge automatic power-off device, comprising: two power-off devices, each comprising: an insulating frame body having a surrounding space surrounded by a frame edge and provided on a side frame side thereof a recessed groove is disposed in the opposite direction, and a flexible plate extending in the surrounding space is disposed on the opposite side of the frame, the flexible plate is provided with an opening at the end, and the opening is adjacent thereto a blade portion is formed in a side of the end of the flexible plate; a conductive sheet having two halves in a folded shape, and a folded portion connecting the two half portions is formed, and the conductive sheet is inserted into the flexible portion Inside the opening of the board, the two halves are placed on the end of the flexible board, and the folded portion is opposite to the edge of the flexible board; and the two conductive electrodes each have a guiding portion, and Each of the guiding portions of the two conductive electrodes is respectively disposed in two recesses of the insulating frame, and the two connecting portions are respectively electrically connected to the conductive foil a fixed combination on the half piece; and a battery having a ring disposed on the second power-off device Between the inner body, the handle is provided with a positive electrode and a negative electrode on the handle body, the positive and negative electrical contact lever respectively corresponding to the guide portion of the two breaker device; Wherein, the flexible board of the two power-off devices is attached to the surface of the battery body. The battery having an overcharge automatic power-off device according to claim 7, wherein the insulating frame is provided with a fixing plate protruding toward the flexible plate with respect to a side frame side of the flexible plate. And the two halves of the conductive sheet are sandwiched on the fixing plate. The battery having the overcharge automatic power-off device according to the seventh aspect of the invention, wherein the fixing plate is provided with a through hole, and the two halves of the conductive sheet are adhered to each other through the through hole. The battery with an overcharge automatic power-off device according to the seventh aspect of the invention, wherein the frame of the insulating frame is provided with a corresponding positioning hole and a positioning post. A battery having an overcharge automatic power-off device according to claim 7, wherein the conductive sheet is composed of a copper foil. A battery having an overcharge automatic power-off device according to claim 7 or 11, wherein the two conductive electrodes are each formed of a copper foil. The battery with an overcharge automatic power-off device according to claim 7, further comprising two covers sandwiched by the power-off devices, and the two covers are formed with the two-off The opposite hollow portion of the flexible plate of the electrical device. A battery with an overcharge automatic power-off device, comprising: a power-off device, further comprising: an insulating frame having a surrounding space surrounded by a frame edge and provided on a side of the frame a recessed groove is disposed in the opposite direction, and a flexible plate extending in the surrounding space is disposed on the opposite side of the frame, the flexible plate is provided with an opening at the end, and the opening is adjacent thereto a blade portion is formed in one end side of the flexible plate; a conductive sheet having two halves in a folded shape, and a folded portion connecting each other is formed between the two halves, the conductive sheet is inserted into the opening of the flexible board, and the two half clips are sandwiched And being disposed on the end of the flexible board, and the folded portion is opposite to the edge of the flexible board; and the two conductive electrodes each have a guiding portion and a connecting portion extending from the guiding portion thereof The guiding portions of the two guiding electrodes are respectively disposed in the two grooves of the insulating frame, and the two connecting portions are respectively electrically connected to the two halves of the conductive sheet to be fixedly coupled; a body disposed in the surrounding space of the power-off device, wherein the body is provided with a positive electric handle and a negative electric handle, and the positive and negative electric handles respectively correspond to the two guiding portions of the power-off device; a box seat having an accommodating space therein, wherein the battery is housed in the accommodating space; wherein the power-off device is pressed on the surface of the battery body. The battery with an overcharge automatic power-off device according to claim 14, wherein the insulating frame is provided with a fixing plate protruding toward the flexible plate with respect to a side frame side of the flexible plate. And the two halves of the conductive sheet are sandwiched on the fixing plate. A battery having an overcharge automatic power-off device according to claim 14, wherein the fixing plate is provided with a through hole, and the two halves of the conductive sheet are adhered to each other through the through hole. The battery with an overcharge automatic power-off device according to claim 14, wherein the insulating frame has corresponding positioning holes and positioning posts on the frame side. A battery having an overcharge automatic power-off device according to claim 14, wherein the conductive sheet is composed of a copper foil. A battery having an overcharge automatic power-off device according to claim 14 or 18, wherein the two conductive electrodes are each formed of a copper foil. The battery with an overcharge automatic power-off device according to claim 14, further comprising two covers sandwiched by the power-off device, and the two covers are formed with the power-off device The opposite hollow portion of the flexible plate.