TWI247445B - Cap assembly for nonaqueous electrolyte battery - Google Patents

Abstract

The present invention relates to a cap assembly for nonaqueous electrolyte battery, especially for a lithium ion battery. The cap assembly includes a metal case and a cap plate for covering an upper portion of the case by laser welding. The cap plate defines an electrolyte injection hole for injecting electrolyte into the case. A cover member completely covers the electrolyte injection hole at one end in the case and is welded with the cap plate. The structure of the present invention can tolerate high pressure produced in the battery and improve an air tightness of the assembly.

Description

1247445 V. Technical Field of the Invention The present invention relates to a battery package structure, and more particularly to a lithium ion battery sealing structure using a liquid electrolyte. [Prior Art] In recent years, computers, communication electronics, and consumer electronics have become more and more powerful, and their external dimensions are becoming smaller and smaller, and the quality is getting lighter. Therefore, high-capacity, small-sized battery products are subject to welcome. In particular, lithium-ion batteries have the characteristics of large capacity, high energy density, high voltage, etc., and their market share in mobile phones, notebook computers, digital cameras and other products continues to rise. Lithium-ion batteries are lithium-cobalt oxides, snail oxides (LiNi〇2) or manganese oxides (LiMriJ4), etc., as positive electrode active materials, and negative electrode active materials such as ruthenium metals, alloys or carbon materials. The electrolyte can use a liquid organic electrolyte or a solid polymer electrolyte, and the latter is a liquid electrolyte. Month J hangers 'water; gluten, such as carbon-ethyl ester, lithium salt (such as the liquid electrolyte used in the ion battery is Ethylene Carbonate, EC, Diethyl Carbonate, The mixture of DEC) is a solvent L i PF e ) is a solute and is added with a small amount of additive. The anode and the negative electrode of the ion battery need to be opened one by one to allow ions to pass through and isolate the electrons. The isolating membrane material is an organic polymer such as olefin (PE) and polypropylene (pp), and the second layer mainly comprises a polyethylene layer structure. The above positive electrode, negative electrode and separator are double or more in the day;

V. INSTRUCTIONS (2) Inject the electrolyte into the metal can, soak the positive and negative electrodes, and convert the electrical energy and chemical energy into each other. x One-up metal cans have a good sealing effect to prevent moisture from entering. Again. The metal can is made of aluminum or stainless steel with a cylindrical shape and a square opening at one end. After the positive electrode, the negative electrode and the separator of the battery are packaged in the metal can," = sealing and welding with the metal can to ensure that the battery has good waterproof and anti-gas. See the tenth figure for a schematic diagram. The lithium ion battery pack can accommodate the positive electrode, the negative electrode, and the electrolyte to form an opening ligand with the upper end of the can body 17. The square lithium-ion battery package of the technology comprises a square metal can body 17, which is inside (not shown); a cap 10 which is externally combined and welded to the can body 17 and the plate 12, When the plate 1 2 is to be formed and has a toroidal concavity thin, electric or positive solution steaming, the cap 10 includes a cover plate 12; between the first insulating sheet 1 3 positive terminal 1 1; a second insulator is insulated; a pole connector 16 is connected to an electrolyte injection tank 22, and the ring is broken or decomposed when the battery is reversely connected, and the groove 22 is cracked to weld the rivet 15 to the positive electrode end. Riveting (not shown) into the electrolyte; degree compared to the cover 1 2, for example, short circuit, rapid rise in pressure, the body can be released from the positive terminal 11; a riveted and insulating sheet 13 3, the edge piece 14 is placed Positive electrode connector 1 6-cell battery positive electrode phase liquid hole 20 is used for the irregularity of the shape of the groove 22, 'the internal temperature of the battery causes the inside of the battery' so that the internal gas is placed on the cover plate 1 2 The nail 1 5 penetrates the cover 11 fastened between the cover cover 1 2, the lower end of the nail 1 5 , . The cover plate 1 2 - the other side of the side is provided with a thicker overcharge and over discharge of other parts, so that the organic electricity has a certain limit value. 'Preventing electricity 1247445 V. Invention description (3) """"""'' The pool exploded. However, the annular groove is not easy to control its thickness, so that the ultimate pressure that the battery can withstand is difficult to control. / Chinese patent brother 01274686.x? Tiger Jielu is a chain battery package with explosion-proof membrane, which uses aluminum foil instead of the circular groove of the prior art as an explosion-proof device. Because the thickness of the aluminum foil is easy to control, the design ^ 2 Control the ultimate pressure that the explosion-proof device can withstand. U.S. Patent No. 6,1, 7, 586 discloses a lithium ion battery improvement scheme which is improved in the conventional explosion-proof structure, and a prison rupture disk is connected to the positive electrode and the positive terminal, and when the blast is y extruded, Eve seven: y: 4 mouth 也 乂 乂 乂 乂 绿 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 电池 电池 被The θ u 产生 pool generates excessive current and is damaged. When the battery cover and the tank are welded, the +, & a solution is filled with liquid. Conventional technology for electric=================================================================================================== The electrolyte leakage material enters the battery through the liquid injection hole, and at 2 o's, it is easy to cause soldering and the like, which may cause a short welding or a false hole when the gas leakage or liquid leakage is insufficient, and the welding strength car Crossover, therefore,, ", in addition, because the electrolyte injection is easy to occur due to the rupture of the weld at the injection port, the internal rise of the two pools, in view of this, provides a suspension of the second, resulting in a serious female accident. The sub-battery sealing structure is really necessary. Li and qi, sexuality and safety of lithium separation [Content]

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IHH 1247445 V. INSTRUCTION DESCRIPTION (4) To overcome the poor, and to have a good electrolyte leakage in providing a battery sealed junction, the invention has an opening to the opening, which comprises a dense inner body of the can The upper cover edge. When the predetermined limit is reached, the sealing cover can be provided with a waterproof cover and a conventional cover, and the vertical seal can be received and insured. The conventional technology has a relatively good airtightness and a solid lithium ion structure. The upper cover ‘the upper cover opens the cover and the upper cover extends to the end of the injection. The electrode end cover is formed to prevent the inner surface of the explosion-proof cover from being snapped into the ring elastic washer. Compared with the technology, the liquid-filled hole is welded on the liquid-tight hole, and the liquid-filled hole is not properly sealed, resulting in poor airtightness. The purpose of the present invention is to prevent moisture from entering the battery and avoiding the battery. The first and the sealing structure, another object of the present invention, is a high-strength and safe lithium sealing structure, which comprises a metal can body, whose shape matches the opening, and the sealing welding δ has electrolysis. a liquid injection hole; and a sealing member, wherein the sealing cover is attached to the inner surface and completely covers the liquid injection hole; and the liquid hole is 'integrated with the upper cover. The sub-existing device between the electrode terminal and the upper cover is when the internal pressure of the can is raised to a rupturable release pressure. An annular groove is formed around the liquid injection hole, and is formed in the groove. Further, in the annular groove, the sealing member can cover the sealing hole by the sealing member to ensure good sealing of the injection hole, and the pressure inside the battery is completely protected from pressure by the sealing member to ensure battery safety.

Page 8) Page 1247445 x---- V. DESCRIPTION OF THE INVENTION (5) [Embodiment] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments - reference to the first and sixth figures, In this embodiment, a prismatic lithium ion battery is taken as an example. The lithium ion battery sealing structure of the present invention includes a can body 80' and a cover plate 110 sealed and welded to the can body 80. Wherein, the cover 11 〇 = a positive terminal 1 〇 6 is formed in the middle portion, and a main liquid hole 1 1 2 is opened on both sides of the positive electrode terminal 丨〇 6 and an explosion-proof device 1 〇 2 is sealed. The can body 8 is a main square, and the inside thereof can accommodate a battery positive electrode, a negative electrode, a separator, and an electrolyte. The can body 80 has a square opening (not shown, the f plate 1 1 〇 has a square opening In combination with the size and shape, the straw can be sealed by sealing in the opening. The cover plate 11 can be made of a metal material, generally of metal or stainless steel. Formed in the middle of the cover plate 11, the basin passes through the cover to the positive electrode (not shown) inside the can body 80, and is insulated from the cover plate 110 by an insulating medium (not shown). The device 1 0 2 can be connected to _, when the internal pressure of the battery is V, the annular groove or explosion-proof, releasing pressure. The force rises to a predetermined limit value, which can break the liquid injection hole 1 1 2 After the connection is made, the electrolysis_=% is passed, and the soldering holes 112 of the cover plate 110 and the can body 80 are sealed. The electrolysis is injected into the liquid injection hole 112. Then the night/main liquid hole 112 is close to the seesaw 110 internal table

1247445 V. INSTRUCTION DESCRIPTION (6) The end 113 is sealed by a sealing member 〇2〇, and the sealing member 12 has an arc-shaped main body 1 2 1 and a tie rod 相连 2 connected to the main body 丨 2 1 4, the curved body 121 seals the injection hole 12 end, and the pull rod 124 extends from the inner surface of the main body 1 2 - 1 through the liquid injection hole 2, and is welded to the tie rod 124 and the crucible The plate 11 is sealed and welded into one body, and a welding layer 132 is formed by welding to fill the sealing hole 11 2 , thereby tightly fastening the sealing member 〇 2 于 to the cover plate 110 and the sealing liquid hole 112 has a good sealing effect. In addition, the inner surface i 13 of the cover plate 10 may be further formed with an annular groove 1 1 4 surrounding the liquid injection hole 12, and the shape thereof is matched with the shape of the edge 1 22 of the sealing member ,2 ,. Tightly fastened to further enhance the sealing effect. 9 The design of the present invention utilizes the sealing member 20 to close one end of the liquid injection hole 丨丨2, and the pressure formed inside the battery is entirely received by the main body 丨2 1 of the sealing member ,2 ,, and the welding layer 132 is protected from the inside. The pressure is broken to ensure the safety of the battery; the sealing member 120 is fastened to the cover plate 110 by the tie rods 124, so that the edge 122 and the cover 11 岔 form a kneading fit, and the sealing welding process ensures the liquid injection. Hole 11 2 has a good seal. Referring to FIG. 2 to FIG. 6 together, the method for preparing the dense structure of the lithium ion battery of the present invention comprises the following steps: Step 1: As shown in the second figure, a sealing member 120 with a tie rod 124 is provided, and the cover plate 110 is provided. The inner surface 113 forms an annular groove 114 that matches the seal 12'. The sealing member 120 has a main body 121 having a hemispherical or curved shape, and the edge 12 2 is circular, and the diameter of the edge 12 2 is larger than the diameter of the liquid injection hole 112 . The pull rod 1 24 is from the inside of the main body 21

1247445 V. INSTRUCTIONS (7) The surface is extended, and its shape can be cylindrical, the diameter of the liquid injection hole H2 is smaller than the diameter of the cover hole, and the length is larger than the thickness of the cover plate = the shape of the straight body 124 and the main body 121 can be cast from metal. It can also pass the second. The drawbar U4 is formed around the injection hole 112 and is shaped to match the shape of the grooved edge 122. Step 2 of the side of the mountain seal 120, as shown in the third figure, the inner surface 11 3 of the pull plate 110 of the sealing member 12 is passed through the liquid injection hole J 2 4 so that the cover plate 11 is exposed. The upper surface, and the main body of the sealing member 120 ΐ 2 ι: a certain gap is left between the ends of the one. /, the inner surface 1 1 3 B Shimiao ί, the 胄 cover 11G and the can 80 are sealed and welded into a body. The keeper should make the inner surface 113 of the raft 11 facing the inside of the can body 80 so that the main body 1 21 of the sealing member 20 is located at the can body 8 (), and the sealing property is good and the liquid is not leaked. The liquid hole is injected into the electrolyte from the liquid injection hole 112. The diameter of the pull rod 124 is smaller than that of the liquid injection hole 112, so there is still a gap for the electrolyte to be injected. After the cover plate 110 and the second cover are formed, the electrolyte can be injected. The only thing is as shown in the fourth figure. As shown in the fourth figure, the sealing member 120 is fastened to one end of the hole 112 by the pull rod 124. Thereafter, because the pull rod m extends I = 10 outside, a force can be applied to the pull rod m, through which the pull: two: the edge 122 of the plate is fastened into the groove 114, thereby the liquid injection hole 112 step As shown in the fifth figure, the tie rod 124 and the cover plate 11 are sealed and welded 1247445. 5. The invention description (8) ----- is fixed. After the sealing member 20 seals one end of the liquid injection hole 112, the solder is filled. In the gap of the night hole 112, the tie rod 124 is welded to the cover 11〇2 by spot welding. Since the main body 121 of the sealing member 12 blocks the injection hole 112> one end, the solder can be prevented. The liquid is leaked into the battery through the liquid injection hole 112. After the welding is completed, a soldering layer 132 is formed, thereby fastening the sealing member 12 to the seventh step. As shown in the sixth figure, the removing rod 124 is exposed to expose the cover 11 The pull rod 124 is exposed to remove the portion of the upper surface of the cover plate 110 for the purpose of packaging and use. The lithium ion battery sealing structure of the present invention is prepared by the steps of the method, and the Z liquid 'main liquid hole 112 is sealed at one end. The main body 121 of the piece 120 covers the cover: the seal is sealed; ί, the seal 12° and the cover u〇 seal 2 are connected to -胄 by welding, which ensures the good airtightness of the liquid injection hole 112, and the battery is withstand Internal pressure, therefore, can protect the welding layer 132 from fork pressure damage and improve safety. Figure 7 'The invention can also be placed in the recess of the main body 121 of the seal body m carbon, lithiated molecular sieve, active oxidation, Shi Xijiao, sulfuric acid mother dehydration agent, the pot can be placed in the front of the 124 and the cover plate 110 After the liquid solution, sealing the welding rod n / = 4 second figure, the present invention can also proceed to the cover plate (1) formed / 2 1 2; ^ 114 = set a waterproof rubber gasket 142, when the seal 12 is tight 120^ i ml The rubber ring "2 has elasticity, which is pressed by the buckle of the seal 5 to form a better seal with the seal 120. 1247445 V. INSTRUCTIONS (9) The above Sit:; 丄 The present invention can also use a square seal KG instead of a hemispherical or curved sealant]? n _ ^ ^ ... Aberdeen 1Ζϋ. The square seal 150 is generally square with an opening, and the tie rod 154 extends outwardly from the middle of the seal 150 and has a flat sidewall 152. i put, of course, the seals 120 and 150 used in the present invention may be converted into other shapes, and are not limited to the embodiments of the present embodiment, as described in the following paragraphs, as long as they can fasten the cover plate 11 0 = inner surface The U4 sub-injection hole 112 is covered with a cover to form a seal. The invention can also be applied to lithium ion batteries of other shapes, such as a cylindrical lithium ion battery, a corpse, a tank 8 〇 and a cover 11 〇 The shape can be. In summary, the present invention has indeed met the requirements of the invention patent, and is legally patented. However, the above description is only a preferred embodiment of the present invention. If you are familiar with the case, the equivalent modifications made by the person in accordance with the spirit of this S-Sun and the Moon shall be covered by the following patent application. 1247445 BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a schematic diagram of the sealing structure of the lithium ion battery of the present invention. The second figure is a schematic view of a sealing member and a cover plate used in the first embodiment of the present invention. The third figure is a schematic view of the first embodiment of the present invention in which a tie rod of a sealing member is inserted into a liquid injection hole. An embodiment shows a schematic view of a sealing member with a sealing hole. The fifth drawing is a schematic view of a welding rod according to a first embodiment of the present invention.

The sixth figure is a schematic view of the first embodiment of the present invention for removing excess tie rods. The seventh drawing is a schematic view of the second embodiment of the present invention for filling the water absorbing material to the sealing member. Fig. 8 is a schematic view showing the arrangement of a gasket in a groove according to a third embodiment of the present invention. The ninth drawing is a schematic view showing a fourth embodiment of the present invention using a square sealing member. The tenth drawing is a schematic view of a conventional lithium ion battery package structure. Main component symbol description]

Tank 80 Explosion proof 102 Positive pole terminal 106 Cover plate 110 Injection hole 112 Inner surface 113 Groove 114 Sealing member 120, Main body 121 Edge 122 Pull rod 124, 154 Welding layer 132 Water absorbing material 136 Pad 142 150

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Claims (1)

1247445 VI. Patent Application No. 1 · A lithium ion battery sealing structure, comprising: a can body having an opening; the upper cover of the mouth 7 having a shape matching the opening, and sealingly welded to the opening 1 The upper cover 'and penetrates the inner and outer seals of the upper cover, and includes a sealing cover that fastens the inner surface of the upper cover and covers the inner portion of the upper cover and the upper cover to float together. In the seal, the upper cymbal is formed with an electrode end seal, and the structure is insulated therebetween. The a-electrode and the upper cover are as follows: 3. The ion-electricity of the cover is formed in the patent scope: The device is pressed inside the tank. The force is configured as follows. If the explosion-proof device can be broken, the force can be released. The outer seal = the seal structure I such as Shenzhong == [:?, the: 镛:: from such as I = 2 = — 7. For example, please refer to the metal mentioned in the sixth paragraph of the patent scope, including Ming, stainless steel.: ,,,,. The lithium-ion battery sealing structure described in item 1 of the monthly patent range is the other. Page 15 1247445 VI. The sealed spoon note in the scope of patent application And ^, I include an operating rod extending from the sealing cover to the same as the upper cover, such as 申明n丨》. τ明专利范图洁 φ _ , σ _ _ _ 8 of the ion Battery sealing structure, Υ 刼 之 >>> If applying for a direct brake # silly than the aperture of the injection hole is small ° dry circumference of the lithium ion battery seal structure described in item 1 of the seal, such as the mouth The diameter of the liquid injection hole is larger than the diameter of the liquid injection hole. The inner surface of the upper surface of the lithium ion pool in the lithium ion pool of the patented dry square is the annular groove formed around the liquid injection hole. The cover can be fastened into the annular groove. For example, the battery ion sealing structure described in Item 11 of the special scope, 'the annular groove is further provided with a waterproof elastic gasket. A lithium ion battery seal The structure comprises: a tank body having an opening, the tank body can accommodate a battery positive electrode, a negative electrode, a separator and an electrolyte; and 10 11 thereof has a 12 13 upper jaw, the shape of which matches the opening And sealingly welding the opening, the upper cover is formed with a positive terminal and an explosion-proof device And an electrolyte injection hole is opened, the liquid injection hole penetrates the inner surface of the upper cover; and the sealing device comprises a sealing cover and an operation rod connected thereto; wherein the sealing cover is attached to the can body The inner surface of the upper storage is tightly closed, and the liquid injection hole is completely covered; the operation rod is extended; the liquid is inserted into the liquid hole, and is welded integrally with the upper cover. The bell ion battery sealing structure, wherein the can body and the upper cover are made of metal. 1247445 6. Patent application scope 1. 5. The lithium ion battery sealing structure according to claim 14, wherein the metal Includes aluminum and stainless steel. The lithium ion battery sealing structure according to claim 13 wherein the positive electrode comprises lithium cobalt oxide, lithium nickel oxide or lithium manganese oxide. The lithium ion battery sealing structure according to claim 13 wherein the negative electrode comprises a lithium metal, a lithium metal alloy, or a graphite carbon material. 1 . The lithium ion battery sealing structure according to claim 13 , wherein the electrolyte is a non-aqueous organic electrolyte. A lithium ion battery sealing structure according to claim 13 wherein the explosion-proof device comprises an aluminum foil which is rupturable and relieves pressure when the internal pressure of the battery reaches a predetermined limit. Page 17