TW200800558A - Manufacturing method of plastic housing for thin lithium battery - Google Patents

Abstract

A manufacturing method of plastic housing for thin lithium battery is disclosed, comprises the steps of: (a) providing a mold, the mold has a dynamic mold, a static mold, a slide unit, a first feeding inlet, a second feeding inlet, a fan-shaped first pouring inlet and a second pouring inlet, the dynamic mold can rotate 180 degree with respect to the static mold, and the first feeding inlet and the slide units respectively, at two different angles, define a first mold concave communicated with the first pouring inlet and a second mold concave communicated to the second pouring inlet, (b) engaging the molds, (c) injecting a first plastic material into the first feeding inlet, (d) cooling and solidifying the first plastic material, (e) opening the molds, and rotating the dynamic mold 180 degree with respect to the static mold, (f) engaging the molds, (g) injecting a second plastic material to the second feeding inlet, (h) cooling and solidifying the second plastic material, (i) opening the molds.

Description

200800558 IX. OBJECT DESCRIPTION OF THE INVENTION · The technical field to which the invention pertains ‘especially, the invention relates to a method of manufacturing a plastic outer casing - a method of manufacturing a plastic outer casing of a thin lithium battery. [Prior Art]. (1) H and 2 are 'existing' kind of thin plastic battery shells (10) & can be installed in the present, light, thin, short, small

On electronic products. JJ 11, the lithium-ion battery plastic case 100 has a narrow annular peripheral wall _, an outer peripheral surface 12, an inner peripheral surface 13 disposed opposite the outer peripheral surface 12, and a peripheral wall 11 surrounding and defining a plurality of μ Each of the chamber spaces 14 of the battery (not shown) and a bottom wall 15 for closing the chamber space 14 side and connected thereto. The thickness D of the peripheral wall 11, i.e., the shortest distance of the outer peripheral surface 12 and the inner peripheral surface D, is between 〇·25 and 0.5 mm. As shown in FIG. 3, the manufacturing method and the steps of the plastic case 1 of the thin lithium battery are as follows: A mold (not shown) is prepared, and the mold has a feed port and a point-like feed connecting the feed port. a gate, and a cavity that connects the gate. The shape of the hexagram is corresponding to the plastic case 100. Second, the mold is clamped. 2. A molten plastic material is injected into the cavity from the feed port. 4. Wait for the plastic material to cool. 5. Open the mold and take out the processed products. The above-mentioned Haohai mold adopts the design of the point-shaped feed washing, and adopts the one-time injection method of 200800558 to carry out the force mouth JT, sound, one-time processing, and forbearance to enter a plastic injection processing (step can complete the thin plastic g The processing of i(9), although the thin plastic case 100' can be formed, has the following drawbacks in actual operation. Since the appearance of the thin lithium battery plastic case 100 is elongated, and the thickness D of the (4) U is between 〇.25 to The ultra-thin design between 〇5 mm has N·even less than 0.25 mm, so the flow length of the cavity is relatively high, resulting in the material injected into the mold (10), before the filling of the cavity

Cooling and (4) hardening, causing the short-shot phenomenon of the cavity filling. In order to overcome this problem, the injection pressure and the injection speed of the injection molding machine must be increased, but this will cause the mold to be damaged by the impact of the molten plastic material which cannot withstand repeated high temperature and high dust, thereby shortening the life of the mold. SUMMARY OF THE INVENTION Therefore, the object of the present invention is a method for manufacturing a thin-walled battery plastic case which can avoid the short-shot phenomenon and the injection pressure and the injection speed. Therefore, the manufacturing method of the plastic outer casing of the thin lithium battery of the present invention has a peripheral wall having a narrow annular shape and a bottom wall connected to one side of the peripheral wall, the thickness of the peripheral wall being between 〇·25 and 〇5 €, the manufacturing method of the thin lithium battery plastic casing comprises the following steps: (Α), preparing a mold having a moving mold, a static mold, a sliding assembly, a 笫一祉祉哲-, " 弟进枓口,一弟一入口, a pair of first gates that should be the first inlet, and a pair of second gates that should be the second inlet, the movable mold can be opposite to the static mold A first angle is rotated by 18 degrees to a second angle. At the angle of the first angle, the movable mold, the static mold, and the sliding assembly encircle the boundary 200800558

a first mold cavity corresponding to the shape of the peripheral wall, and a::, a β-moving mold, a static mold, and the sliding assembly enclose a second cavity defining a shape of the bottom wall corresponding to the bottom wall, The second length of the first die, and - parallel one: side: parallel - the second direction of the base is divided into a second... the third length of the second direction, the first length is greater than the younger one has a parallel繁-古十仃The fourth length of the younger one and the fourth length 'equal to the second length and one parallel to the first direction, ^^ knife "" and /, the length of the second length of the second brother, the first length - The gate is fan-shaped and is disposed along the first length. (Β) The mold is clamped toward the static mold. (C) Shooting the first-feeding material toward the first-feeding port. The first plastic material enters the first cavity through the first gate. (D) The first plastic material is cooled and solidified. (8) After the movable mold is separated from the static mold, the movable mold is rotated 180 with respect to the static mold. Degree, the second length of the length is greater than the third length

(F) The mold is moved toward the static mold. (G) injecting a second plastic material toward the second feed port, the first plastic material entering the second cavity through the second gate. (Η) The second plastic material is cooled and solidified. (I) demoulding. By using a two-color plastic injection technique, two plastic shots are made, and the first gate shape is fanned and placed along the first length to avoid short shots. [Embodiment] The above-mentioned and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. The preferred embodiment of the method of manufacturing a plastic case for a thin lithium battery of the present invention is for manufacturing a thin lithium battery plastic case 100 which can accommodate a plurality of lithium batteries (not shown). The appearance of the plastic outer casing 100 is similar to that of the conventional figures i and 2. Referring to Figures 1 and 4, the thin plastic case 100 is a mold 20 having two feed ports, and is processed by a plastic injection molding machine (not shown) which can be used for two-color plastic injection and has two plastic injection heads. Manufacturing. The mold 20 has a movable mold 21, a static mold 22, a slider assembly 23, a first feed port 24, a second feed port 241, and a pair of first gates corresponding to the first feed port 24. 25, and a pair of second gates 251 that should be the second feed port 241. In this embodiment, in order to conveniently represent the first and second gates 25 and γι: shapes, an imaginary line is connected to a first semi-finished product % (see FIG. 8) and a second semi-finished product 40 (see FIG. 9). The first semi-finished product 3 is the peripheral wall 11'. The second semi-finished product 40 is a combination of the peripheral wall u and the bottom wall 15. The cymbal slider assembly 23 has two sliders 231 simultaneously located in the movable mold 21, and And the movable pin 21 and the static mold 22 can be driven by the injection molding machine at the same time, and are separated from each other by an injection molding machine (not shown). Gradually approaching, in the process of approaching 200800558, the two sliders 231 are pushed up by the two oblique pins 232, and finally reach a clamping state of the moving and static molds 21, 22 (see Figures 4 and 7). 4, 7 shows that in the mold opening state, the movable mold 21 can be rotated by a first angle (see FIG. 4) relative to the static mold 22 about an axis L by 18 degrees to a second angle (see FIG. 7). During the clamping state of the first angle, the movable mold 21, the static mold 22, and the two sliding blocks 231 surround a first line defining the first gate 25 a hole 26 (see Fig. 5). In the mold clamping state of the second angle, the movable mold 21, the static mold 22, and the two sliders 231 enclose a second mold that defines the second gate 251. The hole 27 (see Fig. 8). In the present embodiment, the mold technology of the movable mold 21 and the static mold 22 are relatively rotated, and the movable and static molds 21, 22 are relatively rotated and can be defined after the mold is closed. The first and second mold holes 26 and 27 are all mature technologies for the injection of the existing two-color plastic. The structure of the mold 2〇 will not be described here, and will only be shown in a schematic view. As shown in Figures 1, 4, 5 and 6. It is shown that the first cavity 26 is in the shape of a ring • $ between and corresponding to the circumference of the plastic casing _. The first cavity 26 has a first length 261 parallel to a first direction 、, parallel a first length 262 of a first direction 及, and a third length 263 parallel to a third direction 。. The first length 261 is greater than the second length 262, and the second length 262 is greater than the third length 263 The first winding 25 is in the shape of a fan and along the first length 261 and a part of the static mold and the static mold 22 The surface is disposed and located in the middle of the third length 263. As shown in Figures 1, 7, 8, and 9, the second cavity 27 is a plate-shaped 9 200800558 1 and corresponds to the bottom of the 4 plastic case 1GG 5 The second cavity 27 has a first length f 271 ' parallel to the second direction γ and equal to the second length, and a third length z parallel to the third length 263 The second length 272 is opposite to the second cavity 27: and is disposed in a fan shape and disposed along the fourth long ridge 271. In the embodiment, the f gate 251 is a fan-shaped appearance. Gate design, but because the first 杈 杈 疋 has a plate-shaped space, therefore, using submerged point-like pouring

mouth. The juice (see Fig. 10) can also quickly fill the second cavity 27 with the molten plastic material to have the same effect. Referring to Figures 4 and 11', the manufacturing method of the thin lithium battery plastic casing comprises the following steps: Step 70 is to prepare the above-mentioned mold 2, and the mold 2 is mounted on the molding machine which can be used for two-color plastic injection. Referring to Figures 4, 5, 6, and 11, step 71 is the act of clamping. In the mouth, the two sliders 231 are pushed by the two oblique pins 232, so that the moving and static pulling 21, 22, and the two sliders 231 jointly define the first cavity % (see FIG. 5). ). Step 72 is to cause the first plastic injection head of the injection molding machine to inject a molten first plastic material 5 忒 toward the first feeding port 24, so that the first plastic material 50 passes through the first rinsing port. 25 enters the first cavity (10). Since the first gate 25 is disposed along the first length 261, and the first length 261 is longer than the second and third lengths 262, 263, compared to the second and third lengths 262, 263 shots, the first plastic material can be injected into the first cavity 26 in a larger amount, and the first gate 25 is 10 200800558 and the third length 263 is located in the third The length of the first and second lengths 26 of the length 263 is shorter, so the (4)_plastic_%% enters the interior of the hole 26 more quickly and is filled before the first plastic material % is cooled. In the first cavity 26, step 73 is to wait for the first plastic injection material 5 () to be solidified and then become the first semi-finished product 30 to be subjected to the second plastic injection.

a second step 74, after the movable mold 21 is opened relative to the static mold 22, and the movable mold 21 is rotated relative to the static mold 22 about the axis L in a state where the first half opening port 30 is not demolded. Ι80 degrees. And, referring to Figs. 7, 8, 9, and 11 'step 75, the movable mold 21 is moved toward the same. During the clamping process, the two sliders are pushed up by the two oblique pins 232, so that the moving and static modules 2 and 22, and the two sliders 231 jointly define the second cavity 27 (see FIG. 8). . 〃 v, 76 疋 远 远 远 远 疋 疋 疋 疋 疋 疋 疋 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第The port 251 is incident on the second cavity 27, and the first semi-finished product 30 is integrally connected with the second plastic material 60 to become the second semi-finished product 40. ..., ^ 7 waiting for the younger plastic material 60 to cool and solidify, that is, become the second semi-finished product 40. ·, ''~ Steps Semi-finished products 40 finished products. After the second semi-finished product 40 is demolded, the second trimming work is performed, that is, the thin plastic outer casing 100 is completed. Through the above description, the advantages of the present invention can be summarized as follows: 200800558 #-, 参_1 2, 4, the two-color plastic material injection technology is applied to the thin plastic shell with a thin thickness D, and the injection processing is performed for the thinner, longer length, short-shooting part, and melting of the processed object. The part of the plastic material with poor fluidity, the second plastic injection and the day is divided into two steps of step 72 and step 76 as shown in Fig. 11, and the thin plastic can be completed without lifting the injection pressure and the injection speed. Injection processing of the outer casing 1〇〇 The mold 2G does not shorten the service life due to excessively high (four) force and speed. • The second sigma 6 is not disposed, the first gate 25 is disposed in the middle of the third length 263, and adopts a fan-shaped design, so that the first plastic material 50 can enter the first and second batches. - The first cavity 26 is filled in the cavity %. In the above, the manufacturing method of the plastic case of the thin lithium battery of the present invention uses a secondary injection processing method, and the first gate 25 is designed as a single appearance and is located in the middle of the third length 263. Therefore, the first plastic 原料 raw material 5G can be injected into the first mold cavity 26 in a large amount of wire speed, which not only can change the phenomenon of σ short shot, but also can avoid the damage caused by the high injection pressure and the injection speed to the mold 20 . Therefore, it is indeed possible to achieve the purpose of the invention. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent change and modification of the patent scope and the description of the invention according to the invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a plastic outer casing of a thin lithium battery; 12 200800558 FIG. 2 is a side cross-sectional view of the thin plastic battery casing; FIG. 3 is a conventional manufacturing method of the plastic battery casing of the thin battery A flow chart 4 is a cross-sectional view of a mold at a first angle of a method for manufacturing a plastic outer casing of a thin dragon battery of the present invention; and FIG. 5 is a perspective view showing the mold of the preferred embodiment. One of the first cavities;

FIG. 6 is a perspective view showing a first semi-finished product of the preferred embodiment and a first gate having a fan shape; FIG. 7 is a cross-sectional view of the mold at a second angle according to the preferred embodiment. Figure 8 is a perspective view showing a second cavity of the mold of the preferred embodiment; Figure 9 is a perspective view showing a second semi-finished product of the preferred embodiment, and a fan-shaped pouring a second gate of the mouth design;

Figure 10 is a perspective view showing the appearance of the second gate using a submersible point-like pouring design; and Figure 11 is a flow chart of the preferred embodiment. 13 200800558 [Description of main component symbols] X...•...·...first direction Y·.........second direction Z ·.........third direction D.........·thickness 1〇.........thin plastic case 1 1 · ································································································ 22.........static die 2 3.........sliding assembly 2 3 1...·slider 2 3 2...·inclined lock 24.........first feed port 241.........second feed port 25·... ...the first gate 251...the second gate 26...the first cavity 261...the first length 262 ·••...the second length 263 ····...the third length 27... ...the second cavity 271......·the fourth length 272·...the fifth length 30.........the first semi-finished product 40*........the second semi-finished product 50···......the first plastic material 60*...··...the second plastic material 14

Claims (1)

200800558 X. Patent application scope 1. 1. A method for manufacturing a plastic battery case of a thin-type clock battery, the plastic case having a peripheral wall having a narrow % shape and a bottom wall connected to one side of the peripheral wall. The thickness of the soil around the sea is between 0 25 and 〇 5 mm. The manufacturing method of the plastic peripheral of the thin lithium battery comprises the following steps: (Α) preparing a mold having a moving mold, a static mold, and a sliding The component ' _ 筮 隹 隹 隹 η η 斤 弟 弟 弟 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科 科The movable mold is rotatable by 18 degrees to a second angle with respect to the first angle of the static mold. At the first angle, the movable mold, the static mold, the sliding, and the surrounding of the member are connected to each other. a first gate and a third hole corresponding to the shape of the peripheral wall. At the second angle, the movable mold, the static mold, and the sliding assembly surround define a first shape corresponding to the second gate and corresponding to the shape of the bottom wall a cavity having a first length parallel to a first direction, a second length parallel to a second direction, and a third length parallel to a third direction, the first length being greater than the a second length, the second length being greater than the third length, the second cavity having a parallel a fourth length that is oriented in the same length as the second length, and a fifth length that is parallel to the third direction and is equal to the third length, the first gate is fan-shaped and disposed along the first length; The feather mold is moved toward the static mold; (C) a first plastic material is injected into the first feed port, so that the first plastic material enters the first plastic material through the first opening (D) the first plastic material is cooled and solidified; 15 200800558 / + (E) After the movable mold is separated from the static mold, the moving mold is rotated 180 degrees with respect to the static mold; μ (F ) will The movable mold is subjected to a mold clamping operation toward the static mold; ^ (G) injecting a second plastic material into the second feed port, so that the second plastic material enters the second mold hole through the second washing port; ~ (Η) the second plastic material is cooled and solidified; and (I) demolded. 2. The method according to the first aspect of the invention, wherein the sliding assembly of the step (Α) has two sliders located on the movable mold, and two The oblique pin on the static mold, when the mold is clamped, the oblique pins can respectively push the sliders to move toward each other. When the mold is opened, the material obliquely pushes the special blocks to move away from each other. 3. The method of manufacturing a thin lithium battery plastic case according to claim 1, wherein in the step (A), the second gate is a fan-shaped wash design. 4. The method of manufacturing a thin lithium battery plastic case according to claim 1, wherein in the step (A), the first gate is located in the middle of the third length. 5. The method of manufacturing a thin lithium battery plastic case according to claim 4, wherein in the step (A), the first gate is disposed along a part of the mold surface. 16