TW565963B - Sealed battery and its manufacturing method - Google Patents

Abstract

The present invention relates to a sealed battery and its manufacturing method, namely, the present invention provides a sealed battery positively allowing leakage inspection, its manufacturing method, and leakage inspection method of sealed battery. In the sealed battery of the present invention containing helium, after evacuating the interior of a battery can sealed expect for an electrolyte pouring hole, an electrolyte is poured in from the electrolyte pouring hole by pressurizing it with helium containing gas of a pressure equal to or more than the atmospheric pressure, and after pouring the electrolyte and injecting the helium containing gas, the electrolyte pouring hole is sealed.

Description

565963 V. Description of the invention α)-[Background of the invention] The present invention relates to a sealed battery and a method for manufacturing the same; that is, the present invention relates to a sealed battery capable of inspecting electrolyte leakage, and more particularly Lithium-ion battery with high sensitivity and reliable inspection. -In sealed batteries such as lithium-ion batteries, after storing the battery elements in the battery can, the tops with external connection terminals, safety valves, and electrolyte injection ports are soldered, except for electrolyte injection. The sealed electrolyte injection port outside the mouth is filled with the electrolyte, and then, a sealing sheet is installed at the electrolyte injection port, and sealing processing is performed by laser welding, so as to manufacture a sealed battery. . When manufacturing a sealed battery, due to poor welding at the time of sealing or poor locking of the external connection terminal portion installed through the insulating member, leakage of the electrolyte or moisture in the external air may enter the battery. This phenomenon occurs. In a sealed battery with a bad seal, problems such as deterioration of battery performance and damage to the machine due to electrolyte leakage may occur. Therefore, in order to avoid shipment of defectively sealed batteries, leak inspection is performed. However, generally, the sealed battery after charging is inspected visually, and the surface of the battery is checked for leakage by the leakage of the electrolyte. ® and other visual inspections. However, in the inspection method performed by human vision, unevenness may occur due to the personal differences of the inspectors. At the same time, the leakage of the electrolyte may be caused in the state of the finely sealed defective parts and the like. , W

89122232.ptd Page 5 565963 The invention description (2) is extremely fine. Therefore, it is not easy to find a small seal like the one mentioned above when restricting its shipment, and problems will occur. + Good battery, but it is possible, therefore, to propose the use of airtight test equipment such as the Yamaguchi-style test method, which does not use the test method Φ V and the perception of human beings. For example, the pressure inside the Japanese specialty, scholar '... after decompression, the pressure change in the closed container is closed. After a, after the reasoning, then, take a short time to measure, and benefit the rule In the method described above, in addition to the pressure change, the leakage battery is correctly detected. This type of airtight inspection 4i special: JP-A-4_25738, which records-the industry, Yu Dian, !! Ϊ p airtight inspection device, which is used to assemble the battery into the battery tank: 蕤: ladies cover "Holding" pressurized and supplied hydrogen gas after the body; but J > semiconductor gas sensor, and the sealed battery ^ 诒 inspection device that detects the leaked liquid is not explosive to perform the injection of electrolytic hydrogen π ^ product leakage inspection, and also uses so-called health. * Gas, therefore, there will be safety problems. In addition, in Japan

—A kind of airtight test Zhuangtlett Kaiping 丨 1—30 7 1 36 is published, and it is described that the cover body is joined 2 and the airtight test device is a cover on the top of the electric tank, 1 ′ Next, install the gas that covers the electric tank and the cover, and the second test * 235 235 gas is inside the electric tank to attract the air inside the cover. However, this gas ^ 12 helium gas in order to determine the Airtightness: Body bonding: two inspections are performed to check the completion of the sealed battery in the electrolyte bath and the cover during the manufacturing operation.

Page 6 565963 V. Description of the invention (3) Inspection of leakage of products. The micro-sealing problem of the subject pool of the present invention is to provide a sealed battery of the present invention. [Summary of the invention] The hermetic seal of the present invention is contained inside the sealed liquid port of the present invention, and is sealed. Atmospheric pressure is injected from the electrolyte. After the electrolyte is injected, it is then sealed in the dense structure of the present invention. In the case of extrusion, the squeezed battery can is sealed in the tight leak detection device of the present invention with the rare gas. Sealing the sealed type of the present invention, and storing the sealed type, is to provide a sealed type battery capable of reliably identifying a defective part, and a manufacturing method capable of reliably eliminating a seal. It was found that the closed type electricity and the bad battery of the present invention are out of the battery rare gas type battery type battery is filled with the liquid above the mouth and the electrolytic closed type electric mechanism, the wall surface, the type battery closed type electricity, and Test battery type battery, its special body. The pressure in the rare manufacturing tank, the injection of the system containing the dilute liquid injection tank is provided for the purpose of preventing the leakage of the manufacturing tank, which is rare, and the leakage is performed, and the sign is: The gas is helium. The gas contains a rare gas electrolyte, and the gas with gas v ° manufacturing method should contain the deformation method of the rare battery can, the rare gas leakage detection method and the gas concentration. After the treatment, the gas of the body is pressurized, and the gas injected into the body is treated with helium gas. , By the rare gas to facilitate the treatment of containing. Measured in a closed container

89122232.ptd Page 7 565963 V. Description of the invention (4) Rare gas concentration, in order to carry out this leak detection treatment in a closed container. The aforementioned leak detection method of a sealed battery is a leak detection disc provided with a plurality of leak detection discs, which houses the leak-tight battery, and the combination is airtightly installed in each of the leak slots. On the leak detection device, the leak detection top is used to measure the rare gas concentration leaked from the sealed battery.彳 In the leak detection method of the sealed battery mentioned above, the rare gas is helium. [Description of preferred specific examples]

In the present invention, it was found that during the assembly operation of a sealed battery, the sealed battery can be sealed after filling with helium gas, so as to manufacture a sealed battery containing a turbulent gas. It is also possible to use a helium leak detection device to detect the concentration of $ leaked from a sealed battery so that a sealed battery lice with a bad seal can be reliably found. 1 Figure 1 is a sealed type used to illustrate the manufacture of the present invention The operation of the battery is also used to describe the wear type of injecting electrolyte and helium into the battery can. Map

In the battery can 1, the battery element 2 is housed, and the upper part of the battery can 1 is mounted with an electrolyte injection port 3, an external electrode extraction terminal 4 and a pressure inside the battery by a method such as laser welding. It is 1 = and the cover 5 for opening the valve and the like is used to prevent the pressure of the battery from rupturing; in the rising sun guarding the tank 1, the cover 5 is provided with an electrolyte injection device 6 for the electrolyte injection of the liquid injection device 6 Liquid port 3, for liquid injection provided with electrolyte injection device 6,

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When the injection nozzle 7 for the liquid injection is secured to the cover by the airtight maintaining mechanism of the airtight type = In addition, the electrolytic exhaust mechanism 9 and the valve 100 liquid injection device 6 are provided with exhaust gas in the battery tank. It is used to combine the injection of the injection nozzle 7 and the exhaust mechanism 9 to pass through the electrolyte injection valve 1 2 at the injection nozzle 7, and the electrolyte port 11 of the electrolyte solution. In addition, the electric port solution: Yebu uses the mechanism 14 as a yttrium-containing electrolyte supply mechanism 15. Should: Construct electrolyte port 11 and combine helium with pressurized 阙 18 ’

Device Γ: Act as follows: Λ cis order w thunder = S (A). The display shows the battery can 1 (inside the battery can 1) is stored in the opening of the battery can 1 by laser. Welding, etc. and the cover of the women's clothing with the electrolyte injection port 3) is airtight-clothed and the α electrolyte injection port 3, and the electrolyte injection port 3 is attached to the cover ^, A liquid injection nozzle 7 provided with an electrolyte liquid injection device 6 is provided. Next, the air mechanism 9 is activated, and the exhaust valve 10 combining the injection nozzle 7 and the exhaust mechanism g is opened, and the battery tank is exhausted, and at the same time, the electrolytic f supply valve 16 is passed through , And the electrolyte supply mechanism 15 injects a certain amount of electrolyte into the electrolyte port with the battery!! . Next, as shown in Fig. 2 (b), close the exhaust valve and the electrolyte

89122232.ptd Page 9 565963 V. Description of the Invention (6) ^ Valve 16 and open electrolyte injection valve 12. As for the electrolytic solution, since the pressure reduction is performed on the basis of three radicals, the electrolytic solution is started to be injected into the battery can due to the difference in force between the battery can and the electrolytic solution. When starting to inject the electrolyte in the electrolyte port u, it is as shown in the following figure)-2 No, open the pressure valve that is combined with the electrolyte supply mechanism 7, ^ helium gas in the electrolytic material η The electrolyte should be relocated because 1 or 2? The electrolyte is injected into the battery can. At the same time, the helium gas is also injected into the solution. At the same time, the electrolyte injection port is filled and injected into the electrolyte. This causes the gas atmosphere to fill the battery. internal. In addition, when the electrolyte and helium gas are injected, the battery can is pressurized from the inside. Therefore, depending on the size and type of the battery can, the wall surface of the battery can expands and deforms. Occurs, and as a result, it is preferable to suppress deformation due to expansion of the battery can when pressurized. FIG. 3 is a diagram for explaining a mechanism for preventing deformation of a battery can. After the electrolyte is injected from the nozzle 7 for electricity and liquid injection, the pressure valve 18 is opened, and the electrolyte in the electrolyte port is pressurized by helium. The pressing mechanism 20 presses the wall surface 21 of the battery can 1 from both sides to prevent the wall surface 21 of the battery can} from being deformed. The pressure on the wall of the battery can is to match the pressure of the electrolyte in the can, and it is best to use a battery for extrusion. Take the same pressure as the housing force, the electrolyte and helium injection device of the present invention can be arbitrarily set according to the type of battery active material and the battery; within one pay \\ 312 \ 2d-code \ 90- 01 \ B9122232.ptd Page 10 565963 V. Description of the invention (7) The exhaust of part (7) is maintained for 2 seconds under the condition of exhausting from 1.07kPa to 1.33kPa for 5 to 7 seconds. After the pressure is reduced to about 10 minutes, and the vacuum is stable, and after confirming that there are no leaks, etc., the exhaust valve is closed and the electrolyte is injected, and 4 to 10 seconds after the electrolyte is injected. Then, the pressure valve is opened to facilitate pressurization with helium. 08MPa 至 0. 20MPa。 The pressure of helium, preferably the standard pressure of 0. 08MPa to 0. 20MPa. For example, if the liquid injection device of the electrolytic solution of the present invention is used, even if it is a viscous non-aqueous electrolytic solution, it can be installed in a battery with a length of 48 mm, a width of 30 mm, and a thickness of 6 mm in 60 seconds. Inject the electrolyte at the electrolyte injection port with a diameter of 1 mm. In addition, helium can be mixed with other rare gases, or nitrogen and carbon dioxide. However, when the content of gases other than rare gases is increased, the leak detection capability will be reduced. The content of rare gas such as helium is better, and even in rare gas, helium with a small molecule is preferred, and it is easy to pass through the fine leak. In this state, a method of injecting helium gas into the electrolyte from the liquid injection port 'can be performed by the following method; and,

In addition, in the above description, the method of injecting the pressurizing gas into the battery can and performing the electrolyte injection and helium injection are performed. It is explained that helium is introduced at the same time by using helium as the electrolyte solution injection. However, the injection can also be carried out separately: the completed battery can is filled with the electrolyte. Confined room

565963 V. Description of the invention (8) In a closed room, exhaust and decompress ... You must fill the closed room with helium. Then, the lice gas is injected to make the helium-enclosed mine and ^ + method of the present invention as an example. Figure 4 shows the leak detection method of the mountain closed battery. Figure 4 is a diagram for explaining the example shown in Figure 4 (A). And the seal of this setting ^ 'can be used to manufacture the electrolyte of the sealed battery 31 days by the laser connection mechanism 30> the main liquid port 3 so that it can be shown in 4: 31' Asian 'in the initial stage After charging, it is as shown in the battery 31. With [], two leaks: the detection chamber 32, the exhaustion in the closed chamber 32 and the tick detection detector 33 are installed to attract the leakage detection leak. I to measure the helium concentration in order to detect the presence or absence of a battery leak chamber. As shown by Wai Yuan (C), you can read the Ashikari for leak detection. 3 Within 2, perform 2 to facilitate the increase of the air pressure difference between the inside and outside of the battery of the test object, and a treatment like Heshu will increase the leakage rate from the fine leak-free parts and promote its leakage inspection. FIG. 5 is a diagram for explaining another example of the leak inspection method. A plurality of sealed batteries 31 can be accommodated and installed in the battery disc 35 in the leak detection chamber 32, and a helium leak detector provided in the leak detection chamber 32 can also be provided. 3 3. The helium concentration is measured by attracting the gas in the leak detection chamber 3 ^, and the state of helium is detected, which is the same as the state shown in FIG. 4 above. Inside 2, set up each of the detected battery disks and hermetically closed batteries 89122232.ptd Page 12 565963 V. Description of the invention (9) The cell, by means of helium; ^ Leak detector 3 3, attracts the drain The gas in the detection chamber 32 is measured, and the helium concentration is measured to identify the leaked battery. FIG. 6 is a diagram for explaining another example of the leak inspection method. This leak check method is to check the leak head sensor 3 6 of the helium gas leak detector 3 3 on the leaky parts around the sealed battery 31 where welding may occur, and confirm whether a leak occurs. The method can be confirmed by the method as described above. FIG. 7 is a diagram for explaining other examples of the leak inspection method, that is, a perspective view for explaining other examples of the leak inspection method. In a plurality of detection grooves 38 provided in the detection disc member 37, the sealed battery 31 for leak detection is received. The leak detection probe 39 can be installed in the test tank individually and hermetically. The top 40 can be used to measure the helium concentration in each test tank to facilitate the detection of leaks. Alternatively, after the detection top is installed, the measurement can be performed by depressurizing the inside of the detection tank. The detection top can also be installed by a transport mechanism that can move freely to any of the three axes of X, Y, and Z. At the same time, it can also be used to remove the battery that detects the leak. Mechanism to facilitate the automatic detection of leaks. In addition, the sealed battery containing helium of the present invention can also be applied to non-aqueous electrolyte batteries such as lithium ion batteries, batteries using polymer electrolytes, nickel-metal hydride batteries, and sealed lead batteries, and other aqueous electrolyte batteries. on. The helium-containing sealed battery of the present invention can be used for transmission measurement.

89122232.ptd Page 13 565963 V. Description of the invention (ίο) The device measures the leaked parts such as the sealing part of the sealed battery or the part for taking out the conductive connection terminal very evenly and reliably, so as to eliminate the accidental Poorly leaking batteries are likely to be shipped, and the reliability of the batteries they ship can also be improved. [Description of component number] # Battery tank battery element electrolyte injection port external electrode take-out terminal cover body electrolyte injection device injection nozzle 8: 0 ring 9: exhaust mechanism 10 exhaust valve 11 electrolyte Port 12 Electrolyte injection valve 13 Electrolyte 14 Storage mechanism 15 Electrolyte supply mechanism 16 Electrolyte supply valve 17 Helium supply mechanism 18 Pressure valve 20 Extrusion mechanism

89122232.ptd Page 14 565963 V. Description of the invention (π) 21 Wall surface 30 Laser welding mechanism 31 Sealed battery 32 Leak detection chamber 33 Helium leak detector 34 Decompression device 35 Battery plate and dish 36 Leak detection head feel Detector 37 Detector Disk 38 Detector 39 Leak Detection Probe 40 Detector Top

89122232.ptd Page 15 565963 Brief description of the drawings Figure 1 is a diagram for explaining the operation of manufacturing the sealed battery of the present invention, and a device for injecting electrolyte and helium into the battery can. Fig. 2 is a diagram illustrating the operation of the electrolytic solution and helium injection device of the present invention in order. FIG. 3 is a diagram for explaining a mechanism for preventing deformation of a battery can. FIG. 4 is a diagram for explaining an example of the leak inspection method. FIG. 5 is a diagram for explaining another example of the leak inspection method. FIG. 6 is a diagram for explaining another example of the leak inspection method. FIG. 7 is a diagram for explaining another example of the leak inspection method. ««

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Claims (1)

565963 Case No. 89122232 Revised German U Γ Replacement of the present patent application scope 1. A method of manufacturing a sealed battery 5 It is characterized in that in a battery can that is closed except for the electrolyte injection D After the exhaust treatment is performed, the electrolyte solution injected from the electrolyte solution V is pressurized with a gas containing helium gas at a pressure above atmospheric pressure, and the electrolyte solution injection and the gas containing helium gas are performed. After the injection treatment, the electrolyte injection liquid V ° is sealed: / ί 2. The method for manufacturing a sealed battery as described in item 1 of the patent: wherein, a squeezing mechanism is provided, and the squeezing mechanism is provided, When the gas containing helium is supplied, the wall surface 1 of the battery can is pressed to prevent the battery can from deforming. 3. A leak detection method for a sealed battery, which is characterized by: • Measuring the helium concentration by a helium leak detection device, so that the leak detection process can be performed on a sealed battery containing nitrogen. Leak detection method for sealed batteries in the third item (V method, in which a sealed battery is housed in a sealed container, and the concentration of helium is measured under reduced pressure by tf ·, Λ. ^ 5 In order to carry out the leak detection processing on the sealed container: "5. For example, please apply the leak detection method of the sealed battery in item 3 of the patent, in which? A leak detection disk provided with a plurality of detection slots The detection tank 5 of the dish accommodates the sealed battery 5 and 5 the leak detection top 5 combined with the leak detection device is air-tightly installed in each of the detection tanks, and the sealed battery is measured by The drain of the bubble of helium concentration. C: \ master file \ 89 \ 89122232 \ 89] 22232 (replace) -2.ptc page 17