TW471196B - Safety device of closed type battery - Google Patents

Abstract

Disclosed is to provide prevention from rupture caused by the sudden internal pressure elevation of overcharge or short circuit, and manufacture of safety device of closed type battery at low cost. Positive electrode pole cap 16 located at one side of its outer case 11 is composed of pressure sustaining plate, which is to be connected to the positive electrode 13 of electrode 12 by positive electrode lead 17 at the same time to form the most inner cap, shielding plate 20, which is to be electrically connected to the shielding plate 20 of the pressure sustaining plate 18 at the same time to form the intermediate cap and sealing plate 21, which is to be electrically connected to the sealing plate 21. Therefore, central junction portion 19 is formed by protrusion 28 of first flat junction face 27 having pressure sustaining plate 18 and second flat junction face 29 of shielding plate 20. The first flat junction face 27 and the second flat junction face 29 is adhered to form a C-shaped gash 31 on the surroundings of the second flat junction face 29, preferably to form a gash 32 for decreasing strength which is bent to the opposite direction of C-shaped gash 31 at the internal side of C-shaped gash 31, and form a bending provisional portion 33 having narrow width between the two sides 32a of a gash 32 for decreasing strength and the portion 31a which is recessed from the two sides of C-shaped gash 31a specified distance.

Description

471196 each: r, < ’-. ·;: ...

This month is related to the safe installation of sealed batteries with explosion-proof function-case number · 891156 ^ 7 V. Description of the invention (1) The technology to which the invention belongs is the conventional technology liquid in lithium ion batteries, etc. m :::] Use of non-aqueous electrolytic equipment. The animal battery system of the temple is being widely used in portable electronics. This type of battery system has a high electric capacity and is contained in the outer life of the grandfather u ^ ^. The surface of the Chinese surface is changed and the internal pressure is changed ::: positive And the electrode body of the negative electrode will cause non-hydropower of chemical storage batteries; liquid == situation occurs. For example, if the non-aqueous electrolyte solution caused by incorrect use is caused to be decomposed;: i 2, when the electrode is moved, the electrode body is gradually filled with external & ^ βM two gases. This gas system will rupture from cell to cell. Bu | If the internal pressure rises, then at the end the electricity will be: to stop the rupture of this battery, for a long time ...: Closed battery 'as for its-shape' state, so that it can be installed while forming the innermost cover The positive end of the can end of the tank is connected to the pressure plate, and at the same time the metal cap is formed while the middle cap is formed, the electrical connection plate is connected to the metal cap sleeve forming the outermost, gas shield plate.

89115647-91048-1576TW.ptc Page 6

IEH W1196

Made up. With the above structure, when the internal pressure of the battery rises, the center melts the clothes to block the electrical distance of the metal pressure plate and the metal shielding plate. At the same time, the company finds L 3¾, As a result, the processing of the engraving of the masking board made of mongolian genus suffers from the inside of the battery. 5 ^ The milk is discharged to the outside, which can prevent the battery from breaking. By solving the problem, the central ministry wants to give, so for each. As a result, the internal pressure of the battery is blocked and the pressure reaches the set electrical connection. The safety of the battery rises if the internal pressure rises. Electrically sealed batteries between boards. Purpose 0. The above-mentioned conventional sealed battery still has the following applications: The central welding part is tied to the metal shielding plate. The second part: Do not weld the central part of the metal pressure plate to form a closed door. ::: Welding: It is extremely difficult to break the spot-welded part: ^ ^ Electricity>, the welding strength will become uneven ^ belongs to ^ the electrical connection of the pressure plate and the metal shielding plate κ; Γ, ? Airtight batteries vary. Although inside / outside of the battery, metal pressure plates and metal shields are unobstructed, significantly impairing the reliability of airtightness. The present invention was completed to solve such a problem. When the battery reaches a fixed value or more, the pressure bearing plate and the shielding connection can be reliably blocked, so as to provide a safety device that can sufficiently ensure the safety of the sealed battery and have the safety device. The sealed battery is

In order to achieve the above purpose, the book is used in Mingyou M, and the sealed battery is known.

471196 V. Description of the invention (3) '---;: 2 i set' system, while forming the innermost cover, the positive cover through one end of the mt 1 2 outer can is connected to the electrode body through the positive lead. The positive electrode bearing tf forms a middle 盍 while making electrical connection through the central joint part. The shield plate is composed of a shield plate and the sealing plate which is electrically connected to the shield plate while forming the outermost cover. The gas communicates with the internal space of the exterior tank and the joint portion operation space formed between the pressure receiving plate and the shielding plate, and the central joint portion protrudes from the central portion of the pressure bearing plate toward the shielding plate and has a first The protrusion of the flat joint surface is formed with the second flat joint surface provided on the central portion of the shield plate, and the first flat joint surface of the protrusion is elastically abutted, and 1 is formed around the second flat joint surface of the shield plate. 8 0. The above-mentioned arc angle is provided with a c-shaped groove in a concentric circle, and a groove for reducing strength is formed at a position inside the C-shaped groove that becomes the opaque plate. At the same time, both ends of the groove for reducing strength and the c-shaped groove are formed. Both ends of the sulcus are set back to a predetermined distance to form a narrow-bend bent portion. 'The metal foil is joined to the side of the pressure plate of the shielding plate. The 0-shaped sulcus and the strength-reducing sulcus each form a valve film. If the pressure in the outer tank exceeds the set current blocking pressure, the shielding plate is bent upward along the predetermined bending portion, and the second flat joint surface of the shielding plate is passed through the pressure bearing plate. The location of the film around the first flat joint will be broken, which will block the electrical connection between the pressure bearing plate and the shielding plate, and make a current block. If the pressure inside the tank exceeds the set film breaking pressure, it will The valve film is broken like this. Therefore, in a closed space, the electrical connection between the pressure bearing plate and the shielding plate is usually performed by spot welding or the like to make the first flat joint surface on the protrusion of the pressure bearing plate and The second year the tan joint surface of the mask can be joined Indeed

91048-TYJP-1576TW. Ptd Page 8 471196 V. Description of the invention (4) On the other hand, the flow blocking of the shielding plate on the other side of the face is conducted and the gas on the side of the degassing shape rises. Pressure-bearing plate shape, closed surface. When the pressure is equal to the second circumference, it is thin to prevent it from being diverted to the outside. When the strength is low, it becomes narrower than the device, which makes it easy to bend. Therefore, by means of shielding, the dust in the cavity will rise sharply. The pressure of the second decomposed gas in the battery is especially in the shielding plate. Due to the above, because the first flat joint of the pressure bearing plate is flat and flat, the location of the electrical film that blocks the pressure bearing plate and the shielding plate will be the above. The above conditions at the same time prevent the outflow of degassing inflammation. The inside of the C-shaped groove on the second junction surface of the circle has been set in the bag and the specified distance after the C-shaped groove is retracted. The rain of the groove = predetermined portion, so the internal pressure inside the battery sharply increases the width. When the force is applied, the material around the joining part that will bend the current-storage joining surface along the formation of the bent portion will float away from the A-side surface, and it can quickly leave the 22-second flat pressure. And the exact blocking is set by the power = on. At this time, the shielding board will be plastic = the electrical between the boards; the tan joint surface is again abutted with the first it-changing shielding board to prevent the ditch, using a scoring force to make such a C-shaped / blade part, so that It is also possible to use the bottom of the groove in the bottom film portion as a valve film. Fluorine is broken, in case the chemistry in the outer tank is next, although the pressure of the above two electric parts rises again and exceeds the setting it should be performed and the gas film is decomposed. When the pressure of the gas jacket is decomposed, Installed in the cover? It is exhausted to the outside through the gas flow holes, joint operation space, and film exhaust holes that have been installed in the pressure plate, which can prevent the sealed battery from exploding. , And here, it is suitable to set the current blocking pressure at the time of setting the membrane breaking pressure.

91048-TYJP-1576TW.ptd Page 9 471196 V. Description of the invention (5) 1/2 is preferred. The film breaking pressure is set to 10 to 30 kg / cm2. The above-mentioned sealed battery safety device according to the first aspect of the present invention is also characterized by the following points. (1) The 5 melon-shaped grooves bent in a direction opposite to the C-shaped grooves are formed into p low-intensity grooves, and both ends of the reduced-strength grooves are in a polymerized state. On the end. (2) It can also be formed by a straight line i which is arranged between the grooves for reducing the strength and the portions of the c-shaped groove that have been retracted a specified distance from each other. '(3) Most connection assemblies (t a b) can be connected by arranging the inside and outside of the C-shaped groove in an arc. (4) The shield plate is made of a metal plate that has been coated with both a metal foil and a metal plate, and the valve film is formed by covering the inner foil groove and the outer foil ^. Preferably, the thickness of the metal plate is about ^ 5mm, and the thickness of the metal foil is about 20 to 100 // m. 'In addition, such a clad metal plate' is disclosed, for example, by the applicant's previously published Kaipingbu No. 224 1 84, and the extremely low-pressure inert gas surrounding r is 1 X 1 0-1 to 1 X i 〇-4. In the example, a metal substrate and a metal box with a joint surface are used as the electrodes A on the grounded side, and an alternating current of 50 MHz is applied between 1 sen of the insulation support and a glow discharge is performed. # The electrode in the plasma generated by the aforementioned glow discharge, whose area is less than 1/3 of the area of the electric + electrode ^, can be prepared by the sputtering bell etching process. (5) Because the first of the pressure plate The position of the wide film where the flat peripheral surface joins the surrounding area will be broken, blocking the electrical conduction of the pressure bearing plate and the shielding plate, °, binding, and preventing

91048-TYJP-1576TW. Ptd page 10 The above-mentioned canal outflow occurred. At the same time, the joint surface of the pressure plate can prevent the decomposition gas from outward to the material, and it can be produced from A 丨 foil and A1 alloy for about 20 ~ 150. Steel foil or electrolytic iron foil to Nl can be: white not: Xiu steel foil, nickel foil, Cii plated or round, drawing processing is used / the joint surface is a flat joint surface with a diameter of about 2_ The thickness of the side wall can be extended, or as shown in Fig. 5 to protrude outward (expand) ^, the ironing processing method is as shown in Fig. 6 *, for non-joint ^ Frank. In addition, the flat joint surface may be formed with a step difference upward, or may be processed from the thickness side to the thickness reduction as in the first notch processing method. The fracture location is no longer swollen in the central part and is shown in Figure 6 as the scored processing part = Figure 5 is the side wall part, and the second flat man on the masking board is on the face: "is the expansion part. The first flat joint surface between the mouth surface and the pressure-bearing plate is to use a method such as welding, etc. (6) The installation can be done with a concave cut / point connection. Membrane. The bottom wall of the groove It can also form a valve (7) between the shield plate and the seal. The #M 2 person a, T plate is interposed between the c (positive temperature coefficient) thermistor element by a ring plate. pTc thermistor element =, as the temperature of the safety device of the sealed battery rises, at the same time, it is difficult for the current to flow, so it is also made up, put, and ^ made to prevent explosion due to overcurrent. ^ is The sealed battery related to the present invention adopted to achieve the above object is characterized by a safety device including the sealed battery described above.

91048-TYJP-1576TW. Ptd

471196 V. Description of the invention (7) Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings. First, referring to Figs. 1 to 4, a description will be given of the airtightness related to an embodiment of the present invention. The structure of the safety device of the battery. As shown in Figs. 1 to 4, the electrode body 12 is housed in an outer can n which also has a negative electrode terminal. The electrode body 12 has a structure in which a laminate of a positive electrode 13 / separator 14 and a negative electrode 15 is rolled in a spiral shape. Therefore, a safety device of a sealed battery having both explosion-proof function and connection is provided on the opening of the upper end of the exterior tank 11. The safety device is substantially sealed and sealed with an insulation gasket through a gasket 6a and has the following structure The positive electrode cover 16 is formed at an opening at the upper end of the exterior can. As shown in FIGS. 1 to 4, the positive electrode cover 16 substantially includes a pressure receiving plate 18 that is connected to the positive electrode 13 of the electrode body 12 through the positive electrode lead 17 while forming the innermost cover, and is formed in the middle. At the same time as the cover, the shielding plate 20 electrically connected to the pressure receiving plate 18 and the sealing plate 21 electrically connected to the shielding plate 20 are formed while the outermost cover is formed through the central joint portion 1-9. In addition, the positive electrode cover 16 is a ring-shaped insulating plate 22 interposed between the pressure receiving plate 18 and the shielding plate 20, and a PTC made of a ring-shaped plate is interposed between the shielding plate 20 and the sealing plate 21. Thermistor element 23. Next, the configuration of each part of the positive electrode cover 6 having the above-mentioned configuration will be described. As shown in FIGS. 1 to 4, a body flow hole 24 is formed in the pressure receiving plate 18, and the inner space 25 of the outer tank, the pressure receiving plate 18 and the shielding plate 20 are formed through the gas flow hole 24. The joint action space ^ formed between them communicates.

91048-TYJP-1576TW. Ptd Page 12 471196 V. Description of the invention (8) As shown in Fig. 1 to Fig. 4, the central joint 19 of the pressure receiving plate 18 and the shielding plate 20 is electrically connected by the bearing. While the central portion of the pressure plate protrudes toward the shield plate 20, the protrusion 28 having the first flat joint surface 27 and the first flat joint surface 27 provided on the central portion of the shield plate 20 and the protrusion 28 are projected. The second flat joint surface 2 9 is welded. As shown in Figs. 1 to 4, around the second flat joint surface 29 of the shielding plate 20, except for the connection assembly portion 30, the C-shaped groove 31 is in a circle of 180 ° or more. The arc angle β is formed by concentric circles. Further, on the inner side of the C-shaped groove 31, there is formed a groove 32 for reducing strength, which is formed by an arc-shaped groove flexed in a direction opposite to the C-shaped groove 31. Both ends of the strength-reducing groove 32 are arranged in a polymerized state at both ends of the C-shaped groove 31. Therefore, between the two ends 32a of the groove 32 for reducing strength and the portion 31a receded from the both ends of the C-shaped groove 31 by a predetermined distance, a narrow-bend bent portion 33 is formed. In FIG. 2, 3 3 a indicates a planned bending line. In this embodiment, as shown in FIGS. 1 to 4, a metal foil 3 4 ′ is bonded to the side surface of the pressure-receiving plate of the shielding plate 20, and the metal foil 3 4 is covered with a C shape. The grooves 3 1 and the grooves 3 2 for reducing strength can each form the valve films 3 5 and 36. Therefore, the thickness of these valve films 35, 36 is set to be set to a predetermined breaking pressure (e.g., 20 kg / cm2) or more, and the valves are broken. Specifically, in the case where the metal foil 34 is clad and formed into a clad metal plate on an opaque plate made of a thick-walled (for example, 50 em) metal substrate, as for the metal foil 34, for example, 1 〇 " m of copper foil. As for the shielding plate, a metal plate having a thin wall portion at the bottom of the groove may be used by a method such as scoring. For example, from aluminum with a thickness of 0.3mm,

91048-TYJP-1576TW.ptd Page 13 471196 V. Description of the invention (9) A metal plate made of nickel or stainless steel can be used as a shielding plate to make the thickness of the thin-walled part to about 3 〇 M m. The type, thickness, or thickness of the thin-walled part of the metal may be appropriately selected according to the set fracture pressure. By making the above-mentioned configuration of the central joint portion 19 and the shielding plate 20, the pressure in the exterior tank 11 is increased. If the pressure exceeds the set current blocking pressure, as shown in FIG. 3, the valve membrane 3 5 3 and 3 6 are plastically deformed, and meanwhile, the shielding plate 20 is bent in a state of being convex upward along the bend planned portion 3 3 of the weakest part. As a result, the second flat joint surface 29 is broken around the welded portion, and the second flat joint surface 29 is separated from the first flat joint surface 27 provided on the projection 28 of the pressure receiving plate 18. The first flat joint surface 27 may be made of a thin material having a thickness of 20 to 150 / z m. In this way, if the pressure of the decomposed gas becomes the set current blocking pressure, the C-shaped groove 31 and the strength-reducing groove 32 have been installed, and the shielding plate 20 can be quickly separated from the pressure receiving plate 18, so the shielding plate 20 Even if the central part rises only a little, the shielding plate 20 can be completely separated from the pressure receiving plate 18, and the electrical conduction of the pressure receiving plate 18 and the shielding plate 20 can be reliably and quickly blocked. The operation of the safety device of the sealed battery having the above-mentioned structure will be described with reference to Figs. 1 to 4 of the figure. In the above-mentioned sealed battery, for example, if a current flows due to an overcharged state, the large current causes corrosiveness in the outer can 11, and the gas is decomposed, and the pressure in the outer can 11 increases. If this state is maintained, the sealed battery will explode. However, in this embodiment, if the pressure of the decomposed gas in the external tank 11 exceeds the set current blocking pressure, as shown in FIG. 1, the decomposed gas will flow into the joint operation space 2 6

91048-TYJP-15T6TW. Ptd

471196 V. Description of the invention (10) The above-mentioned internal pressure on the projection 28 of the pressure plate 18 of the inner shield plate 20 to block the pressure plate 18 and the shielding gas will rise and be destroyed again, so it can prevent environmental protection. Furthermore, in the event of chemical fixed film cracking or both, the plate 20 and the sealing and rapid frying are performed. In this way, the emission of the whole device, the suppression of the body's electrical efficiency, and the temperature of the plate 20 and the blocking element 23, due to the over-electric reaction, will break when the pressure is re-pressed, and the mouth plate 21 is discharged. It is possible to prevent the external discharge of the dense pond to the human body or as shown in Figure 1 ~ mouth plate 21, so the two flat joints 2 and 9 caused by the flow when the degree rises will be broken. P 仏 U ^ was formed in 7 moxibustion The first flat joint surface 27 quickly leaves the shield plate 2. Between electrical continuity. uThis prevents: The above conditions can reliably prevent the explosion of the outer tank 1 丨, and at the same time the valve membranes 35, 36 have not yet decomposed the harmful gases to the human body to the outside. Conduction, decomposition gas occurs in the outer tank, and the internal pressure rises. If it exceeds the setting, as shown in Figure 4, any decomposition gas of the valve membranes 3, 5 and 3 6 is shielded by the joint operation space 26. The space and the outside of the exhaust hole 37 provided in the sealing plate 21 can reliably prevent the explosion of the sealed battery. The sealed battery related to this embodiment can be used to block the current and decompose the gas toward the outside of the battery. The rupture of the closed battery has not happened before. Furthermore, decomposition of gas ^ may only have an adverse effect on the environment as it is carried out only in case. As shown in the figure, in the present embodiment, in the shielding, the pTC thermosensitive pyrolysis gas formed by a ring plate is interposed. If the sealed battery is safe, the current is difficult to flow. This aspect also prevents explosions.

471196 V. Description of the invention (11) The top view and the 'figure 5 to 7' show the section of the expansion processing section of the pressure plate as shown in Figure 5, and the pressure plate 18 is deep-drawn to the protruding earth material. Cut it so that the second flat part and the first flat phase part of the shielding plate are joined with one point. When the internal pressure of the decomposed gas rises, the side wall of the protrusion will be broken ', and the pressure bearing plate is shielded to prevent the dispersed gas from occurring as described above. As shown in Figure 6, Dentsu Asia Defense, the pressure bearing plate 18 is made on the second flat portion to make a step difference. The second flat portion is covered by fish and pulled in fi fi # ^ V, One flat part is one. "When the internal pressure of the degassing gas rises, the thinner part will break, shielding the pressure-bearing plate and the shield plate: Electric lice V Tongya prevents the decomposition of the gas from occurring above. Fr: Figure: Jinbu 'pressure-bearing plate The 18 series further expands the second flat portion and reduces the thickness of the swollen portion to the same level as the first flat portion of the shielding plate. When the internal pressure of the decomposed gas rises, pre-cut Thin expansion ° As soon as it is connected to the surrounding area, it will break the electrical connection between the pressure-bearing plate and the shield plate and prevent the gas from being decomposed by the knife. The thickness of the pressure-bearing plate can decompose the gas by 2 ~ 1 5 〇1 When the internal pressure rises, the thickness of the material at the fracture location should be determined appropriately according to the internal pressure that should shield the electrical conduction of the pressure-bearing plate and the shield plate. For example, when the thickness of the fracture location is 80 ^ ⑴, the operating pressure 2 becomes 9.5 kg / Cm2, at 100, the operating pressure becomes su 〇kg / cm 2, and at 115 / zm, the operating pressure becomes 丨 丨刈 "Eight to eight. T Ming-effect

471196 V. Description of the invention (12) As described in the above "safety device for sealed battery in item 1 of the scope of patent application" in the case of normal current flow, the joint between the pressure-bearing plate and the shielding part is air-tight. Joining in a confined space, and allowing the sealed battery to operate normally. At the same time when an excessive current flows, the pressure of the decomposed gas is used. The C-shaped groove and the groove for reducing the strength cooperate to operate along the bend above the predetermined portion. The shield plate is bent in a square convex state, and because the first flat joint surface that has been provided on the protrusion of the central portion of the pressure plate is broken, it quickly leaves the second flat joint that has been provided on the central portion of the shield plate. The electrical connection between the pressure-bearing plate and the shielding plate is quickly blocked from the surface, and the battery is quickly discharged to the outside of the battery, so that the current can be reliably blocked and the gas released to the outside of the decomposition gas can be prevented. Yu Weiran. In addition, the discharge of the decomposed gas to the outside of the battery can only be performed in the event of an accident, which can effectively control the bad impact on the human body or the environment. 5 — The safety device of the sealed battery in the second scope of the patent application, It is formed by the arc-shaped groove buckling in the direction opposite to the C-shaped groove. The groove for reducing strength = yak low-strength groove. Both ends of the groove are arranged in a polymerized state. It is easy to form a bent portion with a narrow width. The safety device of the sealed battery of item 3 of the Ming patent, because 绖 = is configured to connect the two ends of the C-shaped groove with a fixed distance between the pitcher and the fruit-shaped linear groove to form a groove for reducing strength. Alternatively: i is formed, and the degree of bending is planned. The error is caused by the safety device of the sealed battery of item 4 in the scope of the patent, which is made by mistake. The internal and external parts of the C-shaped makeup and fan assembly are inspected and arranged in a fox shape. For most companies, it is possible to reduce

471196 V. Description of the invention (13) The strength of the shielding plate can reliably block the electrical connection between the pressure bearing plate and the shielding plate. The safety device of a sealed battery in the scope of patent application No. 5 is a metal foil with a C-shaped groove and a groove for reducing the strength. The metal foil is clad and can be manufactured inexpensively by setting the film breaking pressure. A shielding plate for a valve membrane that can be operated reliably. The safety device of a sealed battery with the scope of patent application No. 6 is made of a bottomed trench with a concave cross-section, which can form a C-shaped trench and a groove for reducing strength. Therefore, it can be formed inexpensively without using a cladding structure. Valve membrane. The aforementioned pressure-receiving plate in item 7 of the scope of patent application is made of a metal plate having a cylindrical protrusion. If the decomposed gas can be broken within a fixed pressure range, the safety is high. Please refer to the aforementioned cylindrical protrusion of item 8 in the range, which is the first level of pressure, and it can be set to a fixed height. The position of the gate of the gate country will be broken, and the safety is better than the 9th scope of the patent application. +, The same deep processing method sideways the protrusion, which is a cylindrical protrusion, which is formed by drawing to decompose the gas. The metal plate that can be thinned at a fixed thickness can be partially broken and has high safety. When the pressure is within the range, the side wall is thinner. The cylindrical protrusion in the thickness direction of a flat joint surface is due to the difference in pressure at the first stage. If the decomposition gas can be used to make a notch in the solid publication, the thinner part of the step joint surface will be broken. When it is inside, in the first flat ground, the safety is higher. ~

91048-TYJP-1576TW.ptd 471196-Year, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month, month The first flat joint surface has a flattened portion with a more expanded thickness, and if the decomposed gas can be in a fixed pressure range, the expanded portion of the first flat joint surface will be broken and the safety is high. The safety device of sealed battery of item 12 of the scope of patent application is a PTC thermistor element formed by an annular plate between the shielding plate and the sealing plate. Because the PTC element makes it difficult for the current to flow, This also prevents explosions caused by overcurrents. Brief Description of the Drawings Fig. 1 is an explanatory diagram of the structure of a safety device of a sealed battery related to one embodiment of the present invention in a normal use state. Fig. 2 is a plan sectional view taken along line I-I in Fig. 1. Fig. 3 is an explanatory diagram of the structure of a safety device of a sealed battery related to one embodiment of the present invention in a state where the electrical connection between the pressure receiving plate and the shielding plate is blocked. Fig. 4 is an explanatory diagram of the structure of a safety device of a sealed battery related to an embodiment of the present invention in a state where a valve film is broken. Fig. 5 is a cross-sectional view of a pressure-receiving plate of a safety device for a sealed battery according to an embodiment of the present invention. FIG. 6 is a diagram of a sealed battery according to an embodiment of the present invention.

89115647-91048-1576TW.ptc Page 19 471196 V. Description of the invention (15) Sectional view of pressure bearing plate of safety device. Fig. 7 is a cross-sectional view of a pressure-receiving plate of a safety device for a sealed battery according to an embodiment of the present invention. Description of the number 11 Outer can 12 Electrode body 13 Positive electrode 14 Separator 15 Negative electrode 16 Positive cover 16a Insulating washer 17 Positive lead 18 Pressure bearing plate 19 Central joint 20 Masking plate 21 Sealing plate 22 Insulating plate 23 PTC thermistor element 24 Gas flow hole 25 Internal space 26 Joint operation space 27 First flat joint surface 28 Cylindrical protrusion

91048-TYJP-1576TW.ptd Page 20 471196 V. Description of the invention (16) 29 Second flat joint surface 30 Connection assembly part 31 C-shaped groove 31a Part 32 Groove for reducing strength 32a End 33 Bending planned part 3 3a Bending plan line 34 Metal foil 35 Valve film 36 Valve film 37 Vent hole 40 Joint portion 41 Scoring portion 42 Expansion portion

91048-TYJP-1576TW.ptd Page 21 471196 Case No. 89115647 Revised

89115647-91048-1576TW.ptc Page 22

Claims (1)

1 Called Zhuo Shou --- ^^ 89115647 One year said 'China Patent Patent No.'; At the same time as the safety device of the sealed battery, > {V 山 γ ^ will be levied on A criminal _L, cover far from 5 ^ The positive electrode connected to the '" end of the tank's inner end where the innermost lid of the outer tank is connected to the positive electrode body is connected by a wire, and the electrical connection between the disk and the outermost cover is simultaneously formed. ^ The cover plate of the calendar plate is connected to the cover of the above-mentioned cover plate. I, in ,, J plate is empty = flow hole 'connects the internal action space of the aforementioned outer skirt tank, The central part of the connection between the shield plates protrudes toward the shield plate and protrudes from the middle A and the stele; i has a cylindrical protrusion with a first flat joint surface, and the joint is the center of the plate. Part is formed by the second flat joint surface of the twelfth cylindrical protrusion that is elastically abutted in front. The arc surface angle of the joint surface around the second flat joint surface of the shielding plate is concentric. There is a c-shaped groove, which is 180 or more inside the C-shaped groove that becomes the aforementioned shielding plate The 3 degree groove is used to form a narrow = 5 sub-shaped fixed part between the two ends of the two grooves of the strength reduction groove, which are retracted by a predetermined distance. The swing of ^ degree pre-joins the metal foil to the aforementioned shielding plate. A valve 犋 is formed on the side of the pressure-bearing plate and on the C-shaped groove and the groove for reducing strength. If the pressure in the external tank exceeds a set current to block the ink, the first flatness of the pressure-bearing plate is first. The joint will be broken, so that the electrical connection between the aforementioned pressure-bearing plate and the front 2 shielding plates is blocked, and a current block is created to block the pressure in the outer tank. 89ll5647-91048-1576TW.ptc Page 23 471196 _Case No. 89115647_Year Month Amendment_ VI. Patent Application Scope If the force exceeds the set diaphragm breaking pressure, the aforementioned valve diaphragm will be broken. 2. If the safety device of a sealed battery according to item 1 of the scope of the patent application, the arc-shaped groove flexed in a direction opposite to the C-shaped groove forms a groove for reducing strength, and the two ends of the aforementioned groove for reducing strength are It is arranged on the both ends of the C-shaped groove in the aggregated state. 3. For the safety device of a sealed battery such as the scope of the patent application, the strength-reducing groove is pre-arranged to connect the strength-reducing groove and the C-shaped groove at both ends. Straight linear grooves are formed between the parts of each other. 4. For the safety device of a sealed battery such as the one in the scope of patent application, the inside and outside of the aforementioned C-shaped groove are connected by a plurality of connecting assembly parts arranged in an arc shape. 5. The safety device of a sealed battery according to any one of claims 1 to 4, wherein the aforementioned shielding plate is formed of a metal foil and a clad metal plate of a metal plate. 6. —A safety device for a sealed battery, which is characterized in that, while forming the innermost cover, the positive electrode cover, which is installed at one end of the outer can, is connected to the positive pressure plate of the electrode body through the positive electrode lead, And a shield plate that is electrically connected to the aforementioned pressure-bearing plate through a central joint while forming an intermediate cover, and 89115647-91048-1576TW.ptc Page 24 471196 _Case No. 89115647_ Modification of the month of the year _6. The scope of the patent application is formed by the sealing plate which is electrically connected to the aforementioned shielding plate while under pressure. A gas flow hole is provided on the plate, so that the internal space of the exterior tank communicates with the operation space of the joint portion formed between the pressure receiving plate and the shielding plate, and the center portion of the pressure receiving plate faces the shielding plate. A cylindrical protrusion protruding from the central joint portion and having a first flat joint surface, and a second flat joint surface elastically abutting the first flat joint surface of the cylindrical protrusion provided at the central portion of the shielding plate; The aforementioned central joint is formed, and a C-shaped groove formed by a bottom groove having a concave cross section is formed concentrically at an arc angle of 180 ° or more on the periphery of the second flat joint surface of the shielding plate, and simultaneously borrowed A thin film portion at the bottom of the C-shaped groove is used to form a valve film, and a groove for reducing strength is formed by a bottom groove having a concave cross-section at a position inside the C-shaped groove that becomes the shielding plate. A valve film is formed at the thin wall portion of the bottom of the strength-reducing groove, and a narrow-width bend is formed between the two ends of the strength-reducing groove and both ends of the C-shaped groove. The predetermined portion breaks the joint portion of the first flat joint surface of the pressure-bearing plate, blocks the electrical connection between the pressure-bearing plate and the shielding plate, and creates a current to block the pressure in the outer tank if the pressure exceeds the set film crack. When the pressure is cut, the valve membrane is cracked. 7. The safety device of a sealed battery according to item 1 or item 6 of the scope of patent application, wherein the pressure-receiving plate is made of a metal plate having a cylindrical protrusion. 89115647-91048-1576TW.ptc Page 25 471196 _Case No. 89115647_Year__ Sixth, the scope of patent application 8. If the patented scope of the seventh category of the safety device of the sealed battery, the aforementioned cylindrical protrusion The first flat joint surface is formed by a thickness of 20 to 150 // m. 9. The safety device of a sealed battery according to item 7 of the scope of patent application, wherein the cylindrical protrusion is a one obtained by drawing to a thickness of a side wall of the protrusion. 10. The safety device of a sealed battery according to item 7 of the scope of patent application, wherein the cylindrical protrusion has a step difference in thickness of the first flat joint surface. 11. The safety device of a sealed battery according to item 7 of the scope of patent application, wherein the first flat joint surface of the cylindrical protrusion is provided with a flat portion having a reduced thickness and an expanded portion. 1 2. If the safety device of the sealed battery of item 1 or item 6 of the scope of patent application, a PTC thermistor element made of a ring plate is interposed between the aforementioned shielding plate and the aforementioned sealing plate. 89115647-91048-1576TW.ptc Page 26