WO2008141474A1 - Method for packaging lithium cell by injecting plastic - Google Patents

Method for packaging lithium cell by injecting plastic Download PDF

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Publication number
WO2008141474A1
WO2008141474A1 PCT/CN2007/001617 CN2007001617W WO2008141474A1 WO 2008141474 A1 WO2008141474 A1 WO 2008141474A1 CN 2007001617 W CN2007001617 W CN 2007001617W WO 2008141474 A1 WO2008141474 A1 WO 2008141474A1
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WO
WIPO (PCT)
Prior art keywords
injection molding
cavity
mold
battery core
plastic
Prior art date
Application number
PCT/CN2007/001617
Other languages
French (fr)
Chinese (zh)
Inventor
Xusong Ruan
Jianyun Zeng
Original Assignee
Huizhou Desay Battery Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huizhou Desay Battery Co., Ltd filed Critical Huizhou Desay Battery Co., Ltd
Priority to PCT/CN2007/001617 priority Critical patent/WO2008141474A1/en
Priority to CN200780002008XA priority patent/CN101366131B/en
Publication of WO2008141474A1 publication Critical patent/WO2008141474A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3468—Batteries, accumulators or fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to the technical field of an injection molding method, and in particular to a method for packaging and packaging a battery core assembly.
  • lithium-ion batteries are a new generation of chemical power sources that emerged in the 1990s. Due to their excellent electrochemical performance and non-polluting properties, lithium-ion batteries are an ideal power source for a variety of advanced portable electronic products.
  • Lithium-ion batteries are divided into two types: polymer lithium-ion batteries and liquid lithium-ion batteries.
  • the biggest difference between a polymer lithium ion battery and a liquid lithium ion battery is that the electrolyte used in the two is different.
  • the liquid lithium ion battery uses an electrolyte, and the battery core needs to be placed in a steel metal shell or an aluminum metal shell.
  • the electrolyte used in the polymer lithium ion battery is a colloidal polymer, and the battery core does not need to be placed in the metal casing like the liquid lithium ion battery, but the polymer battery core is soft, and the battery core needs to be passed through the hard casing.
  • Package Because the lithium battery is usually installed through a battery case or the like, and is positioned and electrically connected by a pressing mechanism such as a spring, the battery needs to have a high rigidity.
  • the lithium battery package form of the soft battery core is mostly made of a plastic case, and is integrally molded by injection molding the battery core.
  • plastic materials for injection molding such as polystyrene
  • a very high pressure about lx 10 8 Pa
  • the thickness of the battery is increased, and the injection molding is liable to form burrs, and at the same time, when the molten resin material is in contact with the battery in the metal mold during injection, the battery in the case is damaged.
  • the technical problem to be solved by the present invention is to provide an injection molding method in which the injection pressure is relatively high without damaging the lithium battery to be injection molded, and the general injection molding equipment and process can be realized, and the requirements for the injection molding equipment are reduced. .
  • the method of injection molding a lithium battery of the present invention is achieved by using a metal mold having a cavity, and the specific steps are as follows:
  • the cell assembly having the output terminal is placed in the cavity of the mold and positioned by the positioning pin in the cavity of the mold; the molten thermoplastic resin having a melt viscosity in the range of 3400 mPa.s to 10000 mpa.s is at IMPa to The molten thermoplastic resin is injected into the cavity of the metal mold under the injection pressure in the range of 10 MPa, so that the plastic resin is filled into the cavity of the metal mold and applied to the front end surface of the battery assembly to form a plastic face cover.
  • the thermoplastic resin is a polyamide thermoplastic resin having a viscosity in the range of 3400 mPa ⁇ s to 10,000 mPa.s, and the injection molding temperature is controlled in the range of 170 to 230 ° C.
  • the mold used in the above solution is composed of an upper mold and a lower mold, and the concave upper and lower molds are combined to form an injection cavity in which the battery core assembly can be placed, and a molding block is arranged in front of the cavity, and the molding block faces the cavity.
  • a convex block is disposed on the side wall, and a positioning pin is disposed on the concave wall of the upper mold and the lower mold.
  • the lithium battery cell assembly packaged by the injection molding method of the present invention may be a liquid lithium ion battery cell assembly with a hard case or a soft polymer cell assembly.
  • the liquid lithium ion battery core assembly comprises a liquid lithium ion battery core with a casing, a protective cover and a protection circuit substrate provided with an output terminal, and the protective cover is placed on the front end surface of the lithium ion battery core, in general,
  • the shape of the protective cover will be larger than the cell in the thickness direction of the cell.
  • a positioning angle is provided on the upper and lower walls of the protection circuit substrate. '
  • the soft polymer lithium ion battery cell of the soft polymer battery core assembly is packaged in a casing made of a metal sheet, and the casing surface of the casing close to the front end of the battery core is pre-molded on the metal casing.
  • the plastic surface is provided with a protective circuit substrate with an output terminal, and the electrode on the front end surface of the battery core is connected to the output terminal on the protection circuit substrate through the plastic surface.
  • the injection molding lithium battery of the invention adopts a glue injection pressure in the range of IMPa to lOMpa, and on the basis of ensuring that the packaged battery is not damaged, the injection molding process is simplified compared to the ultra-low pressure injection molding. Due to the use of less pressure for injection molding, the stability requirements of injection molding equipment are very high. When the product design such as the front end cover thickness of the battery core assembly is less than 0.50 mm, the defect rate will increase greatly.
  • the invention has low requirements for the injection molding process and the injection molding equipment, and has good stability for the products with high molding technology requirements.
  • the injection mold of the present invention has a molding block corresponding to the shape of the injection molding cover, and the injection molding yield is high, and an effective insulating member can be added to the convex block on the molding block according to the needs of the injection molded battery assembly.
  • the battery core assembly of the injection molding package of the invention is connected with a plastic surface protection cover in front of the front end of the battery core having electrodes, which can be used as a positioning for connecting the nickel sheets, and more importantly, the explosion-proof opening of the front end surface of the battery core can be protected from the injection high pressure. Damage.
  • the soft polymer battery core assembly of the injection molding cover of the present invention is protected by a metal sheet.
  • the production of the soft polymer cell assembly with the metal sheet protective packaging is stable.
  • FIG. 1 is a schematic view showing the appearance of a mold of an injection molded lithium battery of the present invention
  • FIG. 2 is a schematic structural view of an injection molded package cell assembly located in a cavity of the mold
  • Figure 3 is a partial enlarged view of the portion A of Figure 2;
  • FIG. 4 is a schematic view of a battery core assembly of the injection molded package of the present invention.
  • Figure 5 is an exploded perspective view of the battery assembly of Figure 4 after injection molding the upper cover;
  • Figure 6 is a schematic view of the appearance of Figure 5;
  • FIG. 7 is a schematic view of another battery core assembly in the present invention.
  • Figure 8 is an exploded perspective view of the battery pack of Figure 7 after injection molding the upper cover;
  • Figure 9 is a schematic view of the appearance of Figure 8.
  • the method for injecting a packaged lithium battery of the present invention will be specifically described below by way of a specific embodiment.
  • the cover of the packaged battery assembly can be formed by the method of the present invention, and the cover covers the electrode end of the battery core and the output terminal of the battery core.
  • the mold used in the method of the present invention is as shown in Figures 1-3.
  • the mold comprises an upper mold 11 and a lower mold 12.
  • the upper mold and the lower mold respectively have inner concave portions, and the inner concave portions of the upper and lower molds are combined to form an injection molded hollow.
  • the cavity, the packaged cell assembly 2 is placed in the cavity.
  • a glue injection hole is arranged at the joint of the upper and lower molds, a thermoplastic resin is injected through the injection hole 10, and an injection molding surface cover is formed on the front end surface of the battery core assembly in the cavity, so that the injection molding of the lithium battery can be realized.
  • the cell assembly 2 placed in the cavity of the mold is illustrated by taking a liquid lithium ion battery assembly as an example.
  • the battery assembly includes a liquid lithium ion battery core 27, and the front end of the battery core is protected.
  • the cover 26, the protective cover is a pre-made plastic body, which is in the form of an open box, and the protective cover is placed at the explosion-proof opening at the front end of the battery core.
  • a protective circuit substrate 23 is attached to the front of the explosion-proof port, and a battery output terminal is disposed thereon.
  • the electrode at the front end of the battery core is connected to the output terminal through the positive nickel plate 25 and the negative nickel plate 24.
  • a raised positioning angle 231 is provided on the upper and lower walls of the protection circuit substrate.
  • a liquid lithium ion battery cell, a protective cover and a protection circuit substrate are arranged in a cavity of the mold.
  • the cavity of the mold is in a "T" shape, and the end of the protection circuit substrate of the battery component is placed in the cavity.
  • a wall of the cavity corresponding to the protection circuit substrate has a positioning pin 14 which cooperates with a positioning angle on the substrate of the protection circuit to function as a substrate for protecting the circuit.
  • the protection circuit substrate of the embodiment of the present invention has a test terminal in addition to the output terminal, and in order to expose the output terminal and the test terminal when the package cover 22 is injection molded, a molding block 13 is provided in front of the mold cavity of the present invention.
  • the forming block that is, the forming block is located at the intersection of the upper and lower molds, and the convex block 131 having the same shape as that of the test terminal and the output terminal is respectively disposed on the side wall of the forming block facing the cavity, so as to ensure the test when the injection cover is pressed. No resin is attached to the terminals and the output terminals.
  • the bumps that are mated to the test terminals as needed in the actual operation can be processed from an insulating material and have high operability.
  • the invention adopts the above-mentioned mold matched with the structure of the electric core component, and uses the specified resin material to enter Lithium battery injection molding.
  • the battery core assembly to be injection molded is first placed in the cavity of the mold, and the mold core is placed at a suitable position of the mold cavity by the positioning needle and the positioning angle;
  • a thermoplastic resin for injection molding such as a polyamide resin, is placed in a heater to be heated to melt.
  • the injection pressure is controlled within the range of l tPa to lOMPa for injection.
  • the melting temperature of the injection molding is controlled at 170 ⁇ 230" C. Considering that the temperature of each point of the injection molding system changes greatly, the melting temperature referred to in the method of the present invention refers to the injection nozzle connected to the injection hole of the mold. temperature.
  • the melting temperature is not limited to the range of 170 ⁇ 23 (TC), and the normal temperature range selected by the present invention will achieve stable production, and the temperature will be too high, which will cause carbonization of the plastic. Accelerate, the viscosity of the injection molding resin becomes small, which causes unnecessary burrs in the injection molded product. In addition, due to the size of the usual battery, there is a change of about 0.10mm, and the injection temperature of 170 ⁇ 230 °C can be lowered. Requirements for mold and battery feed.
  • the molten resin is injected into the cavity of the mold through the mold injection hole within the specified pressure and temperature range, and the cover is injection molded at the front end of the core assembly of the mold cavity by the mold forming block.
  • the protective cover is disposed on the front end explosion-proof port of the battery core, which can effectively improve the pressure resistance performance of the battery core, protect the weak portion of the battery core from the impact of the injection pressure, and protect the battery core. .
  • the requirements for injection molding equipment can be significantly reduced. Injection molding is performed using a relatively high injection pressure.
  • the packaged battery core assembly is exemplified by a liquid lithium ion battery assembly.
  • This method is also suitable for battery components composed of flexible polymer cells during actual injection molding.
  • the soft polymer battery core assembly for injection molding the face cover of the present invention is pre-wrapped with a thin metal sheet, and the metal sheet encapsulating the packaged soft battery core is thinner than the injection molded package, thereby increasing the battery capacity.
  • the soft cell 36 of the flexible polymer cell assembly 3 is wrapped in a metal sheet.
  • the plastic surface is similar to the protective cover in the liquid lithium ion battery assembly, and can protect the battery core when the electrode assembly is molded into the cover 32
  • the role The housing made of the above metal sheet is composed of a box-shaped upper metal piece 37 and a lower metal piece 33.
  • the front end surface of the upper metal piece is connected with a plastic surface 371 by injection molding, and the front end of the lower metal piece is open.
  • the tail end is also connected to the tail plastic surface 34 by injection molding.
  • the plastic surface of the upper metal piece is aligned with the front end opening of the lower metal piece, and the electrode of the soft battery core can be extended at the matching gap so that the battery core electrode can be
  • a protective plate 35 having an output terminal connected to the front of the housing is electrically coupled.
  • the plastic surface of the metal sheet on the casing is a toothed surface
  • the toothed plastic surface can be used for protecting the battery core
  • the plastic injection molding is used for the injection molding.
  • the strength of the cover, filling the gap between the protection plate and the battery core, can effectively protect the thermal shock and pressure shock of the polymer battery during the injection molding process.
  • the soft polymer batteries packaged with metal sheets have the appearance requirements.
  • the surface of the metal sheets can be processed by laser or silk screen on the surface of the metal sheets. The effect of this, in order to increase the capacity of the battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

A method for packaging lithium cell by injecting plastic. A face cover of a electric core assembly can be formed by this method. The electric core assembly may be a lithium ion electric core assembly or a polymer electric core assembly, wherein the polymer electric core assembly was packaged by a metal flake in advance. The method for packaging a lithium cell includes: providing the electric core assembly with a output terminal into a cavity of a mould and locating therein with a location pin; melting thermoplastic polyamide resin desired to be inject at 170 to 230 degrees Centigrade, to make the viscosity of the thermoplastic polyamide resin in the range of 340OmPa •s to 10,000 mPa •s; injecting the said molten thermoplastic polyamide resin into the cavity of the metal mould at the pressure of the injecting plastic in the range of 1 MPa to 10MPa, so as to inject the said thermoplastic polyamide resin into the cavity of the metal mould and coat onto the front face of the electric core assembly to form a plastic face cover.

Description

注塑封装锂电池的方法 技术领域  Method for injection molding lithium battery
本发明涉及一种注塑方法技术领域， 具体涉及一种将电芯组件进行包 塑封装的方法。  The invention relates to the technical field of an injection molding method, and in particular to a method for packaging and packaging a battery core assembly.
背景技术 Background technique
随着人们环保意识的日益增加， 铅、 镉等有毒金属的使用曰益 受到限制， 研究开发锂离子电池已是大势所趋。 锂离子电池是 90年代脱 颖而出的新一代化学类电源， 由于其具有优良的电化学性能和无污染的特 性， 成为多种先进的便携式电子产品的理想配套电源。  With the increasing awareness of environmental protection, the use of toxic metals such as lead and cadmium is limited. Research and development of lithium-ion batteries is the trend of the times. Lithium-ion batteries are a new generation of chemical power sources that emerged in the 1990s. Due to their excellent electrochemical performance and non-polluting properties, lithium-ion batteries are an ideal power source for a variety of advanced portable electronic products.
锂离子电池分聚合物锂离子电池和液态锂离子电池两种。 聚合物锂离 子电池和液态锂离子电池的最大区别在于二者所釆用的电解质不同， 液态 锂离子电池釆用电解液， 其电芯需要置于钢质金属壳或铝质金属壳中。 而 聚合物锂离子电池采用的电解质是胶体聚合物， 其电芯不需要象液态锂离 子电芯那样置于金属壳体内， 但是聚合物电芯较软， 还是需要通过硬质壳 体对电芯进行封装。 因为锂电池使用时通常要通过电池盒或类似的安装位 进行安装， 并借助弹簧等压紧机构进行定位和电连接， 这就需电池具有较 高的刚度。  Lithium-ion batteries are divided into two types: polymer lithium-ion batteries and liquid lithium-ion batteries. The biggest difference between a polymer lithium ion battery and a liquid lithium ion battery is that the electrolyte used in the two is different. The liquid lithium ion battery uses an electrolyte, and the battery core needs to be placed in a steel metal shell or an aluminum metal shell. The electrolyte used in the polymer lithium ion battery is a colloidal polymer, and the battery core does not need to be placed in the metal casing like the liquid lithium ion battery, but the polymer battery core is soft, and the battery core needs to be passed through the hard casing. Package. Because the lithium battery is usually installed through a battery case or the like, and is positioned and electrically connected by a pressing mechanism such as a spring, the battery needs to have a high rigidity.
目前， 软质电芯的锂电池封装形式多釆用塑胶外壳， 并通过对电芯整 体进行注塑成型封装的。 通常注塑时把用于注塑的塑胶材料， 如聚苯乙烯 加热至熔融状态， 并在非常高的压力 （约 l x l08 Pa )下注入到金属模具的 空腔内， 从而形成注塑外壳。 这种注塑封装的胶壳电池， 电池厚度增加， 而且注塑容易形成毛刺， 同时注塑时熔融树脂材料与金属模具内的电池接 触时， 会损坏壳体内的电池。 对于封装锂电池注塑方法， 也有采用较低压 力注塑的约 0. 3-0. 6MPa, 这种低压注塑尽管可以避免损坏减少注塑产生的 毛刺， 但是该数量级的低压注塑， 对注塑设备的精度及其工艺要求都很高, 一般设备难以满足要求。 发明内容 At present, the lithium battery package form of the soft battery core is mostly made of a plastic case, and is integrally molded by injection molding the battery core. Usually, plastic materials for injection molding, such as polystyrene, are heated to a molten state during injection molding, and are injected into a cavity of a metal mold under a very high pressure (about lx 10 8 Pa) to form an injection molded casing. In this injection-molded plastic case battery, the thickness of the battery is increased, and the injection molding is liable to form burrs, and at the same time, when the molten resin material is in contact with the battery in the metal mold during injection, the battery in the case is damaged. For the injection molding method of the packaged lithium battery, there is also a lower pressure injection molding of about 0. 3-0. 6MPa, although the low pressure injection molding can avoid damage and reduce the burrs generated by the injection molding, but the order of magnitude of the low pressure injection molding, the precision of the injection molding equipment and The process requirements are very high, and the general equipment is difficult to meet the requirements. Summary of the invention
本发明所要解决的技术问题是提供一种注塑压力相对高而不至于损坏 被注塑封装的锂电池的注塑方法， 这种封装方法一般的注塑设备以及工艺 都能够实现， 降低了对注塑设备的要求。  The technical problem to be solved by the present invention is to provide an injection molding method in which the injection pressure is relatively high without damaging the lithium battery to be injection molded, and the general injection molding equipment and process can be realized, and the requirements for the injection molding equipment are reduced. .
本发明是通过以下技术方案实现的：  The invention is achieved by the following technical solutions:
本发明的注塑封装锂电池的方法是通过使用具有空腔的金属模具得 以实现的， 具体的步骤如下： .  The method of injection molding a lithium battery of the present invention is achieved by using a metal mold having a cavity, and the specific steps are as follows:
把具有输出端子的电芯组件放置于模具的空腔内并由模具的空腔内的 定位针定位； 把熔融黏度在 3400mPa.s至 10000 mpa.s范围内的熔融热塑 树脂， 在 IMPa至 lOMPa范围内的注塑压力下， 将所述熔融热塑树脂注入 金属模具的空腔内， 使得塑性树脂填充到金属模具的空腔并涂敷于电芯组 件的前端面形成塑胶面盖。  The cell assembly having the output terminal is placed in the cavity of the mold and positioned by the positioning pin in the cavity of the mold; the molten thermoplastic resin having a melt viscosity in the range of 3400 mPa.s to 10000 mpa.s is at IMPa to The molten thermoplastic resin is injected into the cavity of the metal mold under the injection pressure in the range of 10 MPa, so that the plastic resin is filled into the cavity of the metal mold and applied to the front end surface of the battery assembly to form a plastic face cover.
作为上述方法的优选， 热塑树脂采用黏度在熔融黏度在 3400mPa.S至 10000 mpa.s范围内的聚酰胺热塑树脂， 而注塑温度控制在 170- 230°C范围 内注塑效果好。 As a preferred method of the above method, the thermoplastic resin is a polyamide thermoplastic resin having a viscosity in the range of 3400 mPa· s to 10,000 mPa.s, and the injection molding temperature is controlled in the range of 170 to 230 ° C.
上述方案中釆用的模具由上模具和下模具组成， 内凹的上、下模具对 合形成可放置电芯组件的注塑空腔， 空腔的前方设置有成型块， 成型块面 向空腔的侧壁上设置有凸起块， 所述上模具和下模具内凹的壁上设置有 定位针。  The mold used in the above solution is composed of an upper mold and a lower mold, and the concave upper and lower molds are combined to form an injection cavity in which the battery core assembly can be placed, and a molding block is arranged in front of the cavity, and the molding block faces the cavity. A convex block is disposed on the side wall, and a positioning pin is disposed on the concave wall of the upper mold and the lower mold.
本发明注塑方法封装的锂电池电芯组件可以是带有硬质壳体的液态 锂离子电芯组件， 还可以是软质聚合物电芯组件。 ' 液态锂离子电芯组件包括有带有壳体的液态锂离子电芯、 保护罩和设 置有输出端子的保护电路基片， 保护罩套置于锂离子电芯前端面上，一般 情况下,保护罩的外形在电芯的厚度方向上会比电芯大。 保护电路基片上、 下壁上设置有定位角。 '  The lithium battery cell assembly packaged by the injection molding method of the present invention may be a liquid lithium ion battery cell assembly with a hard case or a soft polymer cell assembly. The liquid lithium ion battery core assembly comprises a liquid lithium ion battery core with a casing, a protective cover and a protection circuit substrate provided with an output terminal, and the protective cover is placed on the front end surface of the lithium ion battery core, in general, The shape of the protective cover will be larger than the cell in the thickness direction of the cell. A positioning angle is provided on the upper and lower walls of the protection circuit substrate. '
软质聚合物电芯组件的软质聚合物锂离子电芯被封装于由金属片制 成的壳体内， 所述壳体的贴近电芯前端的壳体面为预先注塑在金属壳体上 的塑胶面， 塑胶面前设置有带输出端子的保护电路基片， 电芯前端面上的 电极穿过塑胶面与保护电路基片上的输出端子连接。 The soft polymer lithium ion battery cell of the soft polymer battery core assembly is packaged in a casing made of a metal sheet, and the casing surface of the casing close to the front end of the battery core is pre-molded on the metal casing. The plastic surface is provided with a protective circuit substrate with an output terminal, and the electrode on the front end surface of the battery core is connected to the output terminal on the protection circuit substrate through the plastic surface.
本实用新型与现有技术相比具有以下显箸效果：  Compared with the prior art, the utility model has the following obvious effects:
1、 本发明的注塑封装锂电池采用的注胶压力在 IMPa至 lOMpa范围 内， 在保证封装电池的不受损坏的基础上， 相比超低压注塑使得注塑工艺 简化。 因采用更小的压力进行注塑， 对注塑设备的稳定性要求非常高， 当 产品设计如电芯组件前端面盖厚度低于 0.50mm时， 不良率会大幅增加。 而本发明对注塑工艺及注塑模具设备的要求低， 对于可成型技术要求高的 产品稳定性好。  1. The injection molding lithium battery of the invention adopts a glue injection pressure in the range of IMPa to lOMpa, and on the basis of ensuring that the packaged battery is not damaged, the injection molding process is simplified compared to the ultra-low pressure injection molding. Due to the use of less pressure for injection molding, the stability requirements of injection molding equipment are very high. When the product design such as the front end cover thickness of the battery core assembly is less than 0.50 mm, the defect rate will increase greatly. The invention has low requirements for the injection molding process and the injection molding equipment, and has good stability for the products with high molding technology requirements.
2、 本发明的注塑模具具有与注塑面盖形状对应的成型块， 注塑成品 率高， 而且还可根据被注塑的电芯组件的需要在成型块上的凸起块上添加 有效的绝缘部件。  2. The injection mold of the present invention has a molding block corresponding to the shape of the injection molding cover, and the injection molding yield is high, and an effective insulating member can be added to the convex block on the molding block according to the needs of the injection molded battery assembly.
3、 本发明注塑封装的电芯组件在具有电极的电芯前端面前连接塑胶 面保护罩， 可作为联接镍片的定位使用， 更重要的是可以保护电芯前端面 的防爆口不受注塑高压的损坏。  3. The battery core assembly of the injection molding package of the invention is connected with a plastic surface protection cover in front of the front end of the battery core having electrodes, which can be used as a positioning for connecting the nickel sheets, and more importantly, the explosion-proof opening of the front end surface of the battery core can be protected from the injection high pressure. Damage.
4、 本发明中注塑面盖的软质聚合物电芯组件， 其软质电芯是由金属 片防护包装的。 金属片防护包装后的软质聚合物电芯组件注塑封装面盖生 产稳定。  4. The soft polymer battery core assembly of the injection molding cover of the present invention, the soft battery core is protected by a metal sheet. The production of the soft polymer cell assembly with the metal sheet protective packaging is stable.
附图说明 DRAWINGS
图 1是本发明注塑封装锂电池的模具外观示意图；  1 is a schematic view showing the appearance of a mold of an injection molded lithium battery of the present invention;
图 2是注塑封装的电芯组件位于模具空腔内的结构示意图；  2 is a schematic structural view of an injection molded package cell assembly located in a cavity of the mold;
'图 3是图 2中 A部的局部放大示意图；  ' Figure 3 is a partial enlarged view of the portion A of Figure 2;
图 4是本发明注塑封装的电芯组件示意图； ·  4 is a schematic view of a battery core assembly of the injection molded package of the present invention;
图 5是图 4中电芯组件注塑上面盖后的分解示意图；  Figure 5 is an exploded perspective view of the battery assembly of Figure 4 after injection molding the upper cover;
图 6是图 5的外观示意图；  Figure 6 is a schematic view of the appearance of Figure 5;
图 7是本发明中的另一电芯组件示意图；  Figure 7 is a schematic view of another battery core assembly in the present invention;
图 8是图 7中电芯组件注塑上面盖后的分解示意图； 图 9是图 8的外观示意图。 Figure 8 is an exploded perspective view of the battery pack of Figure 7 after injection molding the upper cover; Figure 9 is a schematic view of the appearance of Figure 8.
具体实施方式 detailed description
下面通过具体实施方式对本发明注塑封装锂电池的方法作具体详述 通过本发明方法可以形成封装电芯组件的面盖， 面盖把电芯的电极端 部以及电芯输出端子包裹在其中。 本发明方法中釆用的模具如图 1 ~ 3 所 示， 模具包括有上模具 11和下模具 12 , 上模具和下模具分别具有内凹部， 上、 下模具的内凹部对合后形成注塑空腔， 待封装的电芯组件 2放置于空 腔内。 上下模具接缝处设置有注胶孔， 通过注胶孔 10 注入热塑树脂， 在 空腔内的电芯组件前端面形成注塑面盖， 便可实现对锂电池的注塑封装。  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for injecting a packaged lithium battery of the present invention will be specifically described below by way of a specific embodiment. The cover of the packaged battery assembly can be formed by the method of the present invention, and the cover covers the electrode end of the battery core and the output terminal of the battery core. The mold used in the method of the present invention is as shown in Figures 1-3. The mold comprises an upper mold 11 and a lower mold 12. The upper mold and the lower mold respectively have inner concave portions, and the inner concave portions of the upper and lower molds are combined to form an injection molded hollow. The cavity, the packaged cell assembly 2 is placed in the cavity. A glue injection hole is arranged at the joint of the upper and lower molds, a thermoplastic resin is injected through the injection hole 10, and an injection molding surface cover is formed on the front end surface of the battery core assembly in the cavity, so that the injection molding of the lithium battery can be realized.
本发明中放置于模具空腔内注塑的电芯组件 2是以液态锂离子电芯组 件为例说明的， 该电芯组件包括有液态锂离子电芯 27， 电芯前端防爆口处 设有保护罩 26, 保护罩是预先制成的塑胶体， 其为开口的盒体状， 保护罩 套置于电芯前端的防爆口处。 防爆口前连接固定有保护电路基片 23 , 电池 输出端子设置在其上， 电芯前端的电极通过正极镍片 25和负极镍片 24与 输出端子连接在一起。 保护电路基片上、 下壁上设有凸起的定位角 231。 液态锂离子电芯、 保护罩以及保护电路基片组成的电芯组件放置于模具空 腔内， 模具空腔呈 "T" 字型， 电芯组件的保护电路基片的那端放置在空 腔的扩大段处， 与保护电路基片对应的空腔的壁上有定位针 14, 该定位针 与保护电路基片上的定位角配合起到固定保护电路基片的作用。 本发明实 施方式的保护电路基片的除了有输出端子外还有测试端子， 注塑封装面盖 22时为了把输出端子和测试端子裸露在外，在本发明的模具空腔的前方设 有成型块 13, 也就是成型块位于上下模具的对合处， 在成型块面向空腔的 侧壁上分别设置与可与测试端子和输出端子对接的形状一致的凸起块 131， 可以保证注塑面盖时测试端子以及输出端子没有树脂附着其上。 实际搡作 中根据需要与测试端子对接的凸起块可由绝缘材质加工而成， 可操作性 强。  In the present invention, the cell assembly 2 placed in the cavity of the mold is illustrated by taking a liquid lithium ion battery assembly as an example. The battery assembly includes a liquid lithium ion battery core 27, and the front end of the battery core is protected. The cover 26, the protective cover is a pre-made plastic body, which is in the form of an open box, and the protective cover is placed at the explosion-proof opening at the front end of the battery core. A protective circuit substrate 23 is attached to the front of the explosion-proof port, and a battery output terminal is disposed thereon. The electrode at the front end of the battery core is connected to the output terminal through the positive nickel plate 25 and the negative nickel plate 24. A raised positioning angle 231 is provided on the upper and lower walls of the protection circuit substrate. A liquid lithium ion battery cell, a protective cover and a protection circuit substrate are arranged in a cavity of the mold. The cavity of the mold is in a "T" shape, and the end of the protection circuit substrate of the battery component is placed in the cavity. At the enlarged section, a wall of the cavity corresponding to the protection circuit substrate has a positioning pin 14 which cooperates with a positioning angle on the substrate of the protection circuit to function as a substrate for protecting the circuit. The protection circuit substrate of the embodiment of the present invention has a test terminal in addition to the output terminal, and in order to expose the output terminal and the test terminal when the package cover 22 is injection molded, a molding block 13 is provided in front of the mold cavity of the present invention. , that is, the forming block is located at the intersection of the upper and lower molds, and the convex block 131 having the same shape as that of the test terminal and the output terminal is respectively disposed on the side wall of the forming block facing the cavity, so as to ensure the test when the injection cover is pressed. No resin is attached to the terminals and the output terminals. The bumps that are mated to the test terminals as needed in the actual operation can be processed from an insulating material and have high operability.
本发明釆用上述与电芯组件结构相配的模具， 利用指定的树脂材料进 行锂电池注塑封装。 采用本发明方法注塑封装时， 先把待注塑的电芯组件 放置于模具的空腔内， 合模的同时通过定位针与定位角配合使电芯组件位 于模具空腔的合适位置处； 再把用于注塑的热塑树脂， 例如聚酰胺树脂放 置于加热器中加热使其熔融。 当熔融的聚酰胺树脂的熔融黏度是在The invention adopts the above-mentioned mold matched with the structure of the electric core component, and uses the specified resin material to enter Lithium battery injection molding. When the package is injection molded by the method of the present invention, the battery core assembly to be injection molded is first placed in the cavity of the mold, and the mold core is placed at a suitable position of the mold cavity by the positioning needle and the positioning angle; A thermoplastic resin for injection molding, such as a polyamide resin, is placed in a heater to be heated to melt. When the melt viscosity of the molten polyamide resin is
3400mPa.s至 lOOOOmPa.s范围内时， 把注胶压力控制在 l tPa至 lOMPa 范围内进行注胶。 其中注胶的融温度控制在 170 ~ 230"C , 考虑到注胶*** 的各点温度变化较大， 本发明方法中所指的熔融温度， 是指与模具注胶孔 连接的注胶喷嘴处的温度。 When the range is from 3400mPa.s to lOOOOmPa.s, the injection pressure is controlled within the range of l tPa to lOMPa for injection. The melting temperature of the injection molding is controlled at 170 ~ 230" C. Considering that the temperature of each point of the injection molding system changes greatly, the melting temperature referred to in the method of the present invention refers to the injection nozzle connected to the injection hole of the mold. temperature.
对于注胶的热塑树脂其熔融温度在并不局限在 170 ~ 23(TC的范围内， 而本发明所选的温度范围正常使用会达到稳定生产的作用， 因温度过高会 引起塑料的碳化加快， 注塑树脂黏度变小而引起注塑的产品出现不必要的 毛边等现象。 再者因通常电芯的尺寸来料就有 0.10mm左右的变化， 选择 170 ~ 230°C的注胶温度可降低对模具及电芯来料的要求。  For the injection-molded thermoplastic resin, the melting temperature is not limited to the range of 170 ~ 23 (TC), and the normal temperature range selected by the present invention will achieve stable production, and the temperature will be too high, which will cause carbonization of the plastic. Accelerate, the viscosity of the injection molding resin becomes small, which causes unnecessary burrs in the injection molded product. In addition, due to the size of the usual battery, there is a change of about 0.10mm, and the injection temperature of 170 ~ 230 °C can be lowered. Requirements for mold and battery feed.
最后在规定的压力和温度范围内把熔融树脂通过模具注胶孔注入模 具空腔， 在模具成型块的作用下在模具空腔的电芯组件前端注塑形成面 盖。 电芯组件在注塑面盖前预先注塑好的塑胶底壳 29 已粘结在电芯组件 的罵端， 而注塑好面盖后裹上商标 28即得成品电池。  Finally, the molten resin is injected into the cavity of the mold through the mold injection hole within the specified pressure and temperature range, and the cover is injection molded at the front end of the core assembly of the mold cavity by the mold forming block. The pre-molded plastic bottom case of the cell assembly before the injection cap is bonded to the end of the cell assembly, and the finished product is obtained after the face is stamped and the trademark is obtained.
本方法中釆用的封装的电芯组件中， 保护罩设置于电芯的前端防爆口 上可有效的提高电芯的耐压性能， 防护电芯薄弱部位的受注塑压力的冲击， 为保护电芯。 同时能明显降低对注塑设备的要求。 使用相对高的注胶压力 进行注塑封装。  In the packaged battery core assembly used in the method, the protective cover is disposed on the front end explosion-proof port of the battery core, which can effectively improve the pressure resistance performance of the battery core, protect the weak portion of the battery core from the impact of the injection pressure, and protect the battery core. . At the same time, the requirements for injection molding equipment can be significantly reduced. Injection molding is performed using a relatively high injection pressure.
上述注塑封装锂电池的方法中，封装的电芯组件是以液态锂离子电芯组 件为例说明的。 实际注塑封装时本方法也同样适合软质聚合物电芯构成的 电芯组件。 本发明中用于注塑面盖的软质聚合物电芯组件是预先用薄金属 片包裹的， 金属片包裹封装软质电芯相比注塑封装的电芯要薄， 可提高电 芯容量。  In the above method of injection molding a lithium battery, the packaged battery core assembly is exemplified by a liquid lithium ion battery assembly. This method is also suitable for battery components composed of flexible polymer cells during actual injection molding. The soft polymer battery core assembly for injection molding the face cover of the present invention is pre-wrapped with a thin metal sheet, and the metal sheet encapsulating the packaged soft battery core is thinner than the injection molded package, thereby increasing the battery capacity.
参见图 6、 7 , 软质聚合物电芯组件 3的软质电芯 36被包裹于金属片制 成的壳体内， 而电芯的电极端面是由塑胶面保护的， 该塑胶面类似于液态 锂离子电芯组件中的保护罩，可以在给电芯组件注塑面盖 32时起到保护电 芯的作用。 上述金属片制成的壳体是由盒体状的上金属片 37 和下金属片 33对合组成， 上金属片前端面通过注塑方式连接有塑胶面 371 , 而下金属 片的前端是开口的， 尾端也通过注塑方式连接有尾部塑胶面 34。 当上、 下 金属片对合构成壳体时， 上金属片的塑胶面与下金属片的前端开口对合， 在对合缝隙处可以把软质电芯的电极引伸出来， 使得电芯电极可以与壳体 前方连接的具有输出端子的保护板 35形成电联接。 同样保护板上、 下壁上 也有便于与模具空腔的定位针配合的定位角。 Referring to Figures 6, 7 , the soft cell 36 of the flexible polymer cell assembly 3 is wrapped in a metal sheet. In the housing, and the electrode end face of the battery core is protected by a plastic surface, the plastic surface is similar to the protective cover in the liquid lithium ion battery assembly, and can protect the battery core when the electrode assembly is molded into the cover 32 The role. The housing made of the above metal sheet is composed of a box-shaped upper metal piece 37 and a lower metal piece 33. The front end surface of the upper metal piece is connected with a plastic surface 371 by injection molding, and the front end of the lower metal piece is open. The tail end is also connected to the tail plastic surface 34 by injection molding. When the upper and lower metal pieces are combined to form a casing, the plastic surface of the upper metal piece is aligned with the front end opening of the lower metal piece, and the electrode of the soft battery core can be extended at the matching gap so that the battery core electrode can be A protective plate 35 having an output terminal connected to the front of the housing is electrically coupled. Similarly, there are also positioning angles on the upper and lower walls for facilitating cooperation with the positioning pins of the mold cavity.
作为优选上述壳体上金属片上注塑的塑胶面为齿状面，在对软质聚合物 电芯组件放置于模具空腔内注塑封装面盖时， 齿状塑胶面可用于保护电芯， 加固注塑面盖的强度，填 保护板和电芯的间隙，能有效防护聚合物电芯在 注塑过程中的热冲击及压力冲击。  Preferably, the plastic surface of the metal sheet on the casing is a toothed surface, and when the soft polymer battery assembly is placed in the cavity of the mold to mold the surface of the package, the toothed plastic surface can be used for protecting the battery core, and the plastic injection molding is used for the injection molding. The strength of the cover, filling the gap between the protection plate and the battery core, can effectively protect the thermal shock and pressure shock of the polymer battery during the injection molding process.
而对于用金属片包装的软质聚合物电芯与锂离子电芯相比较，其外观巳 达到了需求， 还可以在金属片表面使用激光或丝印的方式对金属片表面进 行处理，可以实现商标的功效，从而来增加电池的容量。  Compared with lithium-ion batteries, the soft polymer batteries packaged with metal sheets have the appearance requirements. The surface of the metal sheets can be processed by laser or silk screen on the surface of the metal sheets. The effect of this, in order to increase the capacity of the battery.

Claims

权 利 要 求 Rights request
1、 注塑封装锂电池的方法， 其特征在于： 依次包括如下步骤： 把具有输出端子的电芯组件放置于模具的空腔内并由模具的空腔内的 定位针定位； A method for injection molding a lithium battery, comprising: the steps of: placing a battery core assembly having an output terminal in a cavity of the mold and positioning by a positioning pin in the cavity of the mold;
把熔融黏度在 3400mPa.s至 10000 mpa.s范围内的熔融热塑树脂， 在 IMPa至 lOMPa范围内的注塑压力下，将所述熔融热塑树脂注入金 属模具的空腔内， 使得塑性树脂填充到金属模具的空腔并涂敷于电芯组件 的前端面形成塑胶面盖。  The molten thermoplastic resin having a melt viscosity in the range of 3400 mPa·s to 10000 mpa.s is injected into the cavity of the metal mold under the injection pressure of IMPa to 10 MPa, so that the plastic resin is filled A plastic face cover is formed to the cavity of the metal mold and applied to the front end surface of the battery core assembly.
2、 根据杈利要求 1 所述的注塑封装锂电池的方法， 其特征在于： 所 述的热塑树脂为聚酰胺树脂。  2. A method of injection molding a lithium battery according to claim 1, wherein the thermoplastic resin is a polyamide resin.
3、 根据权利要求 1 所述的注塑封装锂电池的方法， 其特征在于： 所 述的熔融温度在 170 ~ 230°C范围内。  A method of injection molding a lithium battery according to claim 1, wherein said melting temperature is in the range of 170 to 230 °C.
4、 根据权利要求 3 所述的注塑封装锂电池的方法， 其特征在于： 所 述模具由上模具（11 )和下模具 （12 )组成， 具有内凹部的上、 下模具对 合形成可放置电芯组件的注塑空腔， 空腔的前方设置有成型块（13 ), 成 型块面向空腔的侧壁上设置有凸起块（131 ) , 所述上模具和下模具内凹 的壁上设置有定位针 （14 )。  4. The method of injection molding a lithium battery according to claim 3, wherein: the mold is composed of an upper mold (11) and a lower mold (12), and the upper and lower molds having the concave portion are formed to be placed An injection molding cavity of the cell assembly, a molding block (13) is disposed in front of the cavity, and a convex block (131) is disposed on the sidewall of the molding block facing the cavity, and the upper mold and the lower mold are recessed on the wall A positioning pin (14) is provided.
5、 根据杈利要求 4 所述的注塑封装锂电池的方法， 其特征在于： 所 述的电芯组件包括有液态锂离子电芯、 保护罩和设置有输出端子的保护电 路基片， 所述的保护罩套置于锂离子电芯前端面上。  5. The method of injection molding a lithium battery according to claim 4, wherein: the battery core assembly comprises a liquid lithium ion battery core, a protective cover, and a protection circuit substrate provided with an output terminal, The protective cover is placed on the front end of the lithium ion battery.
6、 根据权利要求 5 所述的注塑封装锂'电池的方法， 其特征在于： 所 述的保护电路基片的上、 下壁上设置有定位角 （231 )。  The method of injection molding a lithium-ion battery according to claim 5, wherein the upper and lower walls of the protection circuit substrate are provided with a positioning angle (231).
7、 根据权利要求 4 所述的注塑封装锂电池的方法， 其特征在于： 所 述电芯组件包括有软质聚合物电芯， 软质聚合物电芯被封装于由金属片制 成的壳体内， 所述壳体的贴近电芯前端的壳体面为预先注塑在金属壳体上 的塑胶面， 塑胶面前设置有带输出端子的保护电路基片， 电芯前端面上的 电极穿过塑胶面与保护电路基片上的输出端子连接。 7. The method of injection molding a lithium battery according to claim 4, wherein: said cell assembly comprises a flexible polymer cell, and the soft polymer cell is encapsulated in a case made of a metal sheet. In the body, the housing surface of the housing adjacent to the front end of the battery core is a plastic surface pre-molded on the metal housing, and a protective circuit substrate with an output terminal is disposed in front of the plastic body, and the front end surface of the battery core is The electrode is connected to the output terminal on the protection circuit substrate through the plastic surface.
8、 根据杈利要求 7 所述的注塑封装锂电池的方法， 其特征在于： 所 述的塑胶面为齿状面。  8. The method of injection molding a lithium battery according to claim 7, wherein the plastic surface is a toothed surface.
PCT/CN2007/001617 2007-05-17 2007-05-17 Method for packaging lithium cell by injecting plastic WO2008141474A1 (en)

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