201133986 六、發明說明： 【發明所屬之技術領域】 本發明係-種製造链電池蓋體之錢安全間的方法。 【先前技術】 由於鐘電池具有大的電容量、高能量密度、高功率密 度、放電平穩以及無記憶效應、儲存壽命長等優點，所以 廣泛應用於日常生活以及各種產業中，尤其是講求輕薄短 小的電子產品（如手機、PDA、筆記型電腦#)， φ 用鋰電池作為電源。 然而，若在異常條件下進行充放電的操作，則在電池 内會因電解液的快速蒸發或因副反應而產生大量的氣體， 使得電池内部壓力升高，而產生爆炸或起火等意外，所以， 目前鋰電池於蓋體會加工形成一洩壓安全閥，以使得在氣 體大量產生時能夠衝破該洩壓安全閥，而達到洩壓的目 的。 6月參看第四圖所示，既有的製造經電池蓋體（21)之、、兔 _ Μ女全閥（22)的方法包括直接於該經電池之蓋體（21)沖^^ —環形凹槽（221)。然而，這種沖設的方式必須精準控制該 環形凹槽（221)的底部（222)與該蓋體底部（2 ’彳）之間的厚度 並使其達很薄的狀態（0_02毫米（mm)至〇〇3mm)，才能確 保安全閥於1 5~25kg/cm2的壓力範圍内開閥，該厚度若太 厚則無法開閥洩壓，造成電池模組損壞，若沖設深度過深， 則易損壞链電池蓋體’導致良率下降，或者在電池尚未異 常使用之前就有爆開的疑慮。 201133986 【發明内容】 本發明人有鐘於既有製造鋰電池蓋體之洩壓安全閥的 方法不易控制環形凹槽的底部與該蓋體底部之間的厚度， 而衫響該’冷壓安全閥的正常使用，因此經過長期的研究以 及重複的试驗之後’終於發明出此鋰電池蓋體之洩壓安全 閥的製造方法。 本發明之目的係提供一種藉由退火的方式改變鋁合金 链電池蓋體機械性質使得安全閥能於不改開閥壓力下亦能 Φ 調整防爆溝沖壓深度的製造方法。 為達上述目的，本發明鋰電池蓋體之洩壓安全閥的製 造方法，包括： 於該鐘電池蓋體沖設一環形四槽，且該鋰電池蓋體係 由鋁合金所製成； 加熱該壤形凹槽内部，使該環形凹槽内部的溫度達200 °C~500°C ； 冷卻該環形凹槽，以於該銀電池蓋體形成洩壓安全 • 閥。 較佳的是，於該鐘電池蓋體沖歷一環形凹槽係包括令 該環形凹槽之底部與該蓋體之底部之間的厚度為 〇 〇5〜0.07毫米（mm卜 較佳的是，上述加熱該環形凹槽内部以及冷卻該環形 凹槽的步驟係以退火處理進行。 本發明又關於一種鋰電池蓋體之洩壓安全閥，其係由 上述製造方法所製成者。 本發明也關於一種鋰電池蓋體，其係包括上述洩壓安 201133986 全閥。 由於鋁合金藉由加熱至特定溫度會使得材料之強度與 硬度降低，而能承受1 8~22kg/cm2的壓力，使得大量氣體 在達到較既有集中之壓力範圍時才會使該洩壓安全破裂， 而達到在準確的壓力下才進行釋壓的效果，而且本發明之 環形凹槽與蓋體之底部之間的厚度無須精準控制或達到非 常薄的狀態，故能避免先前技術所產生的缺點，而提升產 品良率。 • 【實施方式】 請參看第一至三圖所示，本發明鋰電池蓋體（彳彳）之沒 壓安全閥的製造方法，包括： 環形凹槽形成步驟（a) ’其係於該蓋體（彳彳）沖設一環形 凹槽（121)，令該環形凹槽（121)之底部（122)與該蓋體（11) 之底部（111)之間的厚度為0_05〜〇_〇7毫米（mm)，且該蓋 體（11)係由鋁合金所製成； 退火步驟（b)，其係包括加熱該環形凹槽（121)内部（b_ _ ，使該環形凹槽（121)内部的溫度達2〇(rc〜5〇〇〇c，之後 再將該環形凹槽（121)自然冷卻（b_2); 以於該鋰電池蓋體（1彳）形成洩壓安全閥（12)(c)。 明參看第一及二圖，其係顯示一鋰電池的外殼〇 〇)， 該外殼（10)係由銘合金所製成，且包括一蓋體⑴），該蓋 體⑴）可為-體成形於該外殼⑽或者是單獨成形後再與 該外殼之本體相連接，該蓋體（11)具有一沒壓安全閥（12)， 其係由上述製造方法所製成者，該㈣安全間（12)包括一 環形凹槽（121)以及形成於該環形凹槽（121)中央的凸部， 201133986 該環形凹槽（121)具有經退火處理之底部（122)，且該環形 凹槽（121)之底部（122)與該蓋體⑴）之底部⑴^之間的厚 度為0.05〜0.07毫米（mm)。 本發明能夠在該環形凹槽（121)之底部（122)與該蓋體 (1)之底。卩（11 1)之間的厚度為既有的兩倍之情況下，使得 氣體在18〜22kg/cm2的麼力下將其衝破，而達到釋壓的效 果，因此無須深入沖設並精準控制，即可在蓋體〇彳）形成 洩壓安全閥（12)，故能提高鋰電池外殼（1〇)的良率，並確 φ 保鋰電池使用時的安全性。 【圖式簡單說明】 第一圖係本發明之流程圖。 第二圖係本發明鋰電池蓋體之立體圖。 第三圖係本發明鐘電池蓋體之㈣安全間的側面别視 圖。 第四圖係既有鋰電池蓋體之洩壓安全閥的側面剖視 圖。 • 【主要元件符號說明】 (a)環形凹槽形成步驟（b)退火步驟 (b-1)加熱該環形凹槽内部 (b-2)將該環形凹槽自然冷卻（c)形成洩壓安全閥 (10)外殼 （11)蓋體 (111)底部 （12)洩壓安全閥 (121)環形凹槽 （122)底部 (21)蓋體 （211)蓋體底部 201133986 (22)洩壓安全閥 （221)環形凹槽 (222)底部201133986 6. DISCLOSURE OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention is a method for manufacturing a money safe room for a battery cover. [Prior Art] Because the battery has the advantages of large capacity, high energy density, high power density, stable discharge, no memory effect, long storage life, etc., it is widely used in daily life and various industries, especially for light and thin. Electronic products (such as mobile phones, PDAs, notebooks #), φ use lithium batteries as a power source. However, if the charging and discharging operation is performed under abnormal conditions, a large amount of gas is generated in the battery due to rapid evaporation of the electrolyte or side reaction, so that the internal pressure of the battery rises, and an accident such as an explosion or a fire occurs, so At present, the lithium battery is processed in the cover body to form a pressure relief safety valve, so that the pressure relief safety valve can be broken when the gas is generated in a large amount, and the pressure relief is achieved. As shown in the fourth figure in June, the existing method of manufacturing the battery cover (21) and the rabbit _ female full valve (22) includes directly punching the battery cover (21). Annular groove (221). However, this manner of punching must precisely control the thickness between the bottom (222) of the annular groove (221) and the bottom of the cover (2 '彳) and bring it to a very thin state (0_02 mm (mm) ) to 3mm), to ensure that the safety valve is opened within the pressure range of 15~25kg/cm2. If the thickness is too thick, the valve cannot be opened and the pressure is broken, resulting in damage to the battery module. If the depth is too deep, The damage to the chain battery cover' causes a drop in yield, or there is a concern that the battery will burst before the battery has been used abnormally. 201133986 SUMMARY OF THE INVENTION The present inventors have a method of manufacturing a pressure relief valve for a lithium battery cover that is difficult to control the thickness between the bottom of the annular groove and the bottom of the cover, and the shirt sounds cool. The normal use of the valve, after a long period of research and repeated tests, 'finally invented the method of manufacturing the pressure relief valve of the lithium battery cover. SUMMARY OF THE INVENTION The object of the present invention is to provide a manufacturing method for changing the mechanical properties of an aluminum alloy chain battery cover by means of annealing so that the safety valve can adjust the punching depth of the explosion-proof groove without changing the valve pressure. In order to achieve the above object, a method for manufacturing a pressure relief safety valve for a lithium battery cover of the present invention comprises: forming an annular four-slot in the battery cover of the clock, and the lithium battery cover system is made of an aluminum alloy; The inside of the groove is such that the temperature inside the annular groove reaches 200 ° C ~ 500 ° C; the annular groove is cooled to form a pressure relief safety valve for the silver battery cover. Preferably, the battery cover covers the annular groove, and the thickness between the bottom of the annular groove and the bottom of the cover is 〇〇5 to 0.07 mm (mm is preferably The step of heating the inside of the annular groove and cooling the annular groove is performed by an annealing process. The invention further relates to a pressure relief valve for a lithium battery cover, which is manufactured by the above manufacturing method. Also relates to a lithium battery cover, which comprises the above-mentioned pressure relief safety 201133986 full valve. Since the aluminum alloy is heated to a specific temperature, the strength and hardness of the material are lowered, and the pressure of 18 to 22 kg/cm 2 can be withstood. When a large amount of gas reaches a pressure range which is more concentrated, the pressure relief is safely broken, and the effect of releasing pressure under an accurate pressure is achieved, and between the annular groove of the present invention and the bottom of the cover body. The thickness does not need to be precisely controlled or reaches a very thin state, so that the disadvantages of the prior art can be avoided and the product yield can be improved. [Embodiment] Please refer to the first to third figures, the lithium battery of the present invention The manufacturing method of the pressureless safety valve of the cover body comprises: an annular groove forming step (a) 'which is formed by punching an annular groove (121) on the cover body to make the annular concave The thickness between the bottom (122) of the groove (121) and the bottom (111) of the cover (11) is 0_05~〇_〇7 mm (mm), and the cover (11) is made of aluminum alloy. Annealing step (b), comprising heating the inside of the annular groove (121) (b_ _ such that the temperature inside the annular groove (121) reaches 2 〇 (rc~5〇〇〇c, and then The annular groove (121) is naturally cooled (b_2); a pressure relief valve (12) (c) is formed on the lithium battery cover (1). Referring to the first and second figures, the lithium battery is shown. The outer casing (10) is made of an alloy and includes a cover (1)) which can be formed into the outer casing (10) or separately formed and then combined with the outer casing The body is connected, and the cover body (11) has a pressureless safety valve (12) which is manufactured by the above manufacturing method. The (4) safety room (12) includes an annular groove (121) and a shape. a convex portion formed in the center of the annular groove (121), 201133986, the annular groove (121) has an annealed bottom portion (122), and a bottom portion (122) of the annular groove (121) and the cover body (1) The thickness between the bottom (1) and the bottom is 0.05 to 0.07 mm (mm). The invention can be at the bottom (122) of the annular groove (121) and the bottom of the cover (1). When the thickness between 卩(11 1) is twice as large, the gas is broken under the force of 18~22kg/cm2, and the effect of pressure release is achieved, so there is no need to deepen the punching and precise control. The pressure relief valve (12) can be formed in the cover body, so that the yield of the lithium battery case (1〇) can be improved, and the safety of the lithium battery can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS The first drawing is a flow chart of the present invention. The second drawing is a perspective view of the lithium battery cover of the present invention. The third figure is a side view of the (4) safety room of the clock battery cover of the present invention. The fourth figure is a side cross-sectional view of a pressure relief safety valve having both a lithium battery cover. • [Main component symbol description] (a) Annular groove forming step (b) Annealing step (b-1) Heating the inside of the annular groove (b-2) Naturally cooling the annular groove (c) Forming pressure relief safety Valve (10) Housing (11) Cover (111) Bottom (12) Pressure relief valve (121) Annular groove (122) Bottom (21) Cover (211) Cover bottom 201133986 (22) Pressure relief valve (221) the bottom of the annular groove (222)
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