WO2022077867A1 - 软包电池及其制作方法 - Google Patents

软包电池及其制作方法 Download PDF

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Publication number
WO2022077867A1
WO2022077867A1 PCT/CN2021/082987 CN2021082987W WO2022077867A1 WO 2022077867 A1 WO2022077867 A1 WO 2022077867A1 CN 2021082987 W CN2021082987 W CN 2021082987W WO 2022077867 A1 WO2022077867 A1 WO 2022077867A1
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Prior art keywords
encapsulation part
battery
manufacturing
encapsulation
battery core
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PCT/CN2021/082987
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English (en)
French (fr)
Inventor
程可文
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Juheyuan Science & Technology Co Ltd
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Juheyuan Science & Technology Co Ltd
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Priority claimed from CN202011404848.2A external-priority patent/CN112563552A/zh
Application filed by Juheyuan Science & Technology Co Ltd filed Critical Juheyuan Science & Technology Co Ltd
Priority to EP21731882.3A priority Critical patent/EP4007045A4/en
Priority to JP2021543485A priority patent/JP2023502186A/ja
Priority to US17/424,443 priority patent/US20220311079A1/en
Publication of WO2022077867A1 publication Critical patent/WO2022077867A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • 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
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/271—Lids or covers for the racks or secondary casings
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to a soft pack battery and a manufacturing method thereof.
  • Soft-packed batteries are lithium-ion batteries that use a polymer shell, usually a composite film package.
  • the pouch battery has good safety performance, and the structure is all packaged with composite film. In the event of a potential safety hazard, the pouch battery will only bulge and crack, and will not explode; the pouch battery is light in weight, and its weight is comparable to the same
  • the capacity of the stainless steel shell lithium battery is 40% lighter, which is 20% lighter than that of the aluminum shell battery; the soft pack battery has high energy density, and its energy density is generally 10% to 15% higher than that of the stainless steel shell battery of the same size, which is higher than that of the aluminum shell battery.
  • the internal resistance of the soft pack battery is small, and the internal resistance of the battery is smaller than that of the lithium battery, which greatly reduces the self-consumption of the battery and has a longer cycle life.
  • the design can also be more flexible.
  • the general soft-pack battery in the industry is generally packaged by using the upper and lower aluminum-plastic films to punch the shell, then heat-sealing the copper mold, and then sealing.
  • a soft pack battery comprising:
  • a first encapsulation part for partially enclosing the battery core
  • the second encapsulation part is used for integrally splicing with the first encapsulation part, so as to encapsulate the battery core;
  • the first encapsulation part is made of metal material
  • the second encapsulated part is made of composite film material.
  • a second aspect of the present application provides a method for manufacturing a soft-pack battery.
  • the soft-pack battery includes a battery core, a first packaging portion, an electrolyte, and a second packaging portion.
  • the method includes:
  • a first encapsulation part is provided;
  • the first encapsulation part and the second encapsulation part are integrally spliced.
  • FIG. 1 is an exploded view of a soft pack battery according to an embodiment of the present application.
  • FIG. 2 is a flowchart of a method for manufacturing a soft-pack battery according to an embodiment of the present application
  • FIG. 3 is a flowchart of a method for manufacturing a pouch battery according to another embodiment
  • FIG. 4 is a flowchart of a method for manufacturing a soft-pack battery according to yet another embodiment
  • FIG. 5 is a flowchart of a manufacturing method of a pouch battery according to yet another embodiment.
  • the current packaging technology mainly has the following problems:
  • the top seal occupies a space of 3.5mm to 4.5mm, and the side seal occupies a space of 1.5mm, and the space utilization is reduced by 15% to 40% (specific and battery model size). It is related, the smaller the model, the greater the proportion of space loss).
  • FIG. 1 is an exploded view of a soft pack battery according to an embodiment of the present application, including:
  • the battery core 1 includes a positive electrode lug 11, a negative electrode lug 12, a separator paper 13, a positive electrode sheet 14, a negative electrode sheet 15 and a wound core 16; On the roll core 16 , and the separator paper 13 is arranged inside the roll core 16 .
  • the first encapsulation part 2 is used to partially enclose the battery core 1 .
  • the battery core 1 is placed in the first encapsulation part 2 , and the positive tab 11 and the negative tab 12 of the battery core 1 protrude from the first encapsulation part. 2;
  • the electrolyte (not shown) is accommodated in the first encapsulation part 2 and infiltrates the battery core 1;
  • the second encapsulation part 3 is used for integrally splicing with the first encapsulation part 2, so as to encapsulate the battery core 1;
  • the first encapsulation part 2 is made of a metal material
  • the second encapsulation part 3 is made of a composite film material.
  • the composite film material as the second encapsulation part 3 is pressed onto the first encapsulation part 2, and then the second encapsulation part 3 and the An encapsulation part 2 is integrally spliced, so as to realize the encapsulation of the battery core 1 .
  • the positive electrode tab 11 and the negative electrode tab 12 are protruded from the first encapsulation part 2 , and the rest of the battery core 1 is encapsulated.
  • the metal material and the composite film material are integrally spliced and packaged, in the first aspect, there is no need to force physical stamping, which avoids damage to the aluminum layer in the middle of the aluminum-plastic, thereby avoiding potential liquid leakage ;
  • metal materials are used to protect the battery core/winding core to avoid short circuit of positive and negative contacts caused by external extrusion;
  • the top seal and side seal are omitted, which greatly improves the space utilization rate, and the smaller the model the battery, the more obvious the improvement effect.
  • the metal material is a stainless steel shell, which can prevent rusting.
  • the composite film material is an aluminum-plastic film.
  • the aluminum plastic film includes a polypropylene layer.
  • Polypropylene can be melted under high-frequency heating, especially compared with other material layers in the general composite film material, polypropylene has a lower melting point under high-frequency heating, so that it can be melted first.
  • the shape of the stainless steel case matches the battery core body, thereby improving space utilization.
  • the stainless steel case and the battery core body are cylindrical, button-shaped, cube or cuboid, so as to meet the needs of different accommodation spaces.
  • the shape adopted in this embodiment is a cube.
  • FIG. 2 is a flowchart of a manufacturing method of a soft pack battery according to an embodiment of the present application.
  • the soft pack battery includes a battery core 1, a first packaging part 2, an electrolyte (not shown) and a second packaging part 3, and the method includes the following steps:
  • the material used for making the first encapsulation part 2 is subjected to a shaping process such as punching to match the shape of the battery core 1 , thereby improving space utilization.
  • the electrolyte required by the battery can be injected to soak the battery core 1 to ensure that the electrolysis reaction can proceed normally later.
  • the second encapsulation part 3 and the first encapsulation part 2 are pressed together to perform preliminary splicing.
  • the battery core 1 or the electrolyte solution cannot be completely sealed or packaged by merely splicing the first packaging part 2 and the second packaging part 3 by pressing, while sealing or packaging the electrolyte solution
  • the first aspect does not require forced physical stamping, which avoids the damage of the aluminum layer in the middle of the aluminum-plastic, thereby avoiding potential
  • metal materials are used to protect the battery core/winding core to avoid short circuit of positive and negative electrodes caused by external extrusion;
  • the top seal and side seal are omitted, which greatly improves the space utilization rate. It is a small battery, the more obvious the improvement effect.
  • FIG. 3 is a flowchart of a manufacturing method of a pouch battery according to another embodiment. As shown in FIG. 3 , in one embodiment, before the step S22 of pressing the second encapsulation part 3 to the first encapsulation part 2, it further includes:
  • Step S2X adding an adhesive at the splicing part of the first encapsulation part 2 and the second encapsulation part 3, and the adhesive can be fused with the second encapsulation part 3;
  • the adhesive at the splicing part of the two, and the adhesive and at least a part of the material of the second encapsulation part 3 can be fused , so that it can be melted into one with the second encapsulation part 3 .
  • FIG. 4 is a flowchart of a manufacturing method of a pouch battery according to yet another embodiment.
  • the above-mentioned step S2X may also be provided after the step S20 of providing the first packaging part 2 .
  • the addition of the adhesive only needs to be performed before step S22 of pressing the second encapsulation part 3 to the first encapsulation part 2 .
  • the first encapsulation part 2 is a metal material.
  • the second encapsulation part 3 is a composite film material.
  • the step S23 of integrally splicing the first encapsulation part 2 and the second encapsulation part 3 specifically includes:
  • the high frequency range is 30KHZ to 100KHZ.
  • the outside of the second encapsulation part 3 is heated by using a high-frequency encapsulation device.
  • the frequency range is generally 30KHZ to 100KHZ, and the heating time is 2 seconds to 10 seconds, which needs to be adjusted according to specific products.
  • part of the materials in the composite material can be fused, it can be integrated with the same material as the adhesive.
  • the first encapsulation part 2 and the second encapsulation part 3 are integrally spliced together.
  • the step S20 of providing the first encapsulation part 2 is specifically:
  • the metal material is punched to form the first encapsulation portion 2 . It can be understood that the pure metal material is subjected to certain stamping to form the desired shape and generally will not cause damage.
  • FIG. 5 is a flowchart of a manufacturing method of a pouch battery according to yet another embodiment. In this embodiment, the method further includes:
  • Step S24 use a small current of 0.1 to 0.5A to perform constant current charging on the soft pack battery for 90 minutes to 150 minutes to activate the soft pack battery.
  • the battery needs to be activated after the production is completed, and the specific technical content will not be repeated here.
  • steps in the flowcharts of FIGS. 2-5 are sequentially displayed according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order, and these steps may be performed in other orders. Moreover, at least a part of the steps in FIG. 2 to FIG. 5 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times. These sub-steps or The order of execution of the stages is also not necessarily sequential, but may be performed alternately or alternately with other steps or sub-steps of other steps or at least a portion of a stage.
  • the step S22 of combining the second encapsulation part 3 to the first encapsulation part 2 specifically includes:
  • the second encapsulation part 3 is press-fitted to the first encapsulation part 2 using a head.
  • the second encapsulation part 3 is a composite material film, its plasticity is strong.
  • the composite film material as the second encapsulation part 3 is pressed onto the first encapsulation part 2, and then the second encapsulation part 3 and the An encapsulation part 2 is integrally spliced, so as to realize the encapsulation of the battery core 1 .
  • the metal material is a stainless steel shell, which can prevent rusting.
  • the composite film material is an aluminum-plastic film.
  • the aluminum plastic film includes a polypropylene layer
  • the adhesive also includes polypropylene.
  • Polypropylene can be melted under high-frequency heating, especially compared with other material layers in the general composite film material, polypropylene has a lower melting point under high-frequency heating, so that it can be melted first.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)
  • Filling, Topping-Up Batteries (AREA)

Abstract

一种软包电池及其制作方法。软包电池包括：电池芯体；第一封装部，用于部分包覆电池芯体；电解液，被容纳于第一封装部中，浸润电池芯体；以及第二封装部，用于与第一封装部一体拼接，从而对电池芯体进行封装；其中，第一封装部为金属材料，第二封装部为复合膜材料。

Description

软包电池及其制作方法
相关申请交叉引用
本申请要求2020年10月18日递交的、标题为“一种新型方形电池”、申请号为202011114188.4的中国申请，2020年12月3日递交的、标题为“一种新型圆柱电池”、申请号为202011404848.2的中国申请，以及2020年10月18日递交的、标题为“一种新型圆形纽扣电池”、申请号为202011114179.5的中国申请，其公开内容通过引用全部结合在本申请中。
技术领域
本发明涉及一种软包电池及其制作方法。
背景技术
在不同外形结构电池中，软包电池由于具有诸多的优势，得到了广泛的关注，软包电池就是采用聚合物外壳，通常是复合膜封装的锂离子电池。软包电池安全性能好，结构上全部采用复合膜进行包装，在发生安全隐患的情况下软包电池最多只会鼓气裂开，而不会发生爆炸；软包电池重量轻，其重量较同等容量的不锈钢壳锂电轻40％，较铝壳电池轻20％；软包电池能量密度高，其能量密度较同等规格尺寸的不锈钢壳电池容量一般会高出10％～15％，较铝壳电池高5％～10％；软包电池内阻小，其电池内阻较锂电池小，极大地降低了电池的自耗电，循环寿命也更长，此外由于是软包的，其设计也可以更灵活。
目前行业内通用的软包电池，其封装一般是先利用上下铝塑膜冲壳，然后铜模热封，然后进行密封。
发明内容
根据一些实施例，本申请第一方面提供一种软包电池，包括：
电池芯体；
第一封装部，用于部分包覆电池芯体；
电解液，被容纳于第一封装部中，浸润电池芯体；以及
第二封装部，用于与第一封装部一体拼接，从而对电池芯体进行封装；
其中，第一封装部为金属材料，第二封装部为复合膜材料。
根据一些实施例，本申请第二方面提供一种软包电池的制作方法，软包电池包括电池芯体、第一封装部、电解液及第二封装部，方法包括：
根据电池芯体的形状，提供第一封装部；
在第一封装部中注入电解液，以浸润电池芯体；
将第二封装部压合到第一封装部；以及
使第一封装部和第二封装部一体拼接。
本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其它特征和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更清楚地说明本申请实施例或传统技术中的技术方案，下面将对实施例或传统技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为根据本申请的一个实施例中的软包电池的爆炸图；
图2为根据本申请的一个实施例的一种软包电池的制作方法的流程图；
图3为根据另一个实施例的一种软包电池的制作方法的流程图；
图4为根据再一个实施例的一种软包电池的制作方法的流程图；
图5为根据再一个实施例的一种软包电池的制作方法的流程图。
具体实施方式
目前的封装技术，主要存在以下问题：
1、在对铝塑膜强行物理冲压成型的时候，弧面的封边会受到物理冲击，使得铝塑膜中间的铝层出现破损。由于存在破损，在电池充放电和存储过程中，电解液会不断腐蚀铝层，造成电池存放后产生气体并造成漏液等致命性不良；
2、由于是软包电池，仅仅依靠通常113um左右的铝塑膜来保护电池内部 的核心部件——卷芯，在电池受到外力冲击的时候，薄弱的铝塑膜不能完全保护卷芯，会造成卷芯内部因外加挤压致正负极接触短路，形成致命损伤；并且
3、常规设计的软包电池，以正方体形的电池为例，其顶封占3.5mm到4.5mm空间，侧封占1.5mm空间，空间利用减少了15％到40％(具体和电池型号尺寸有关系，越小的型号空间损失占比越大)。
为了使本申请的技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
图1为根据本申请的一个实施例中的软包电池的爆炸图，其中包括：
电池芯体1，其包括正极耳11，负极耳12，隔膜纸13，正极片14，负极片15以及卷绕后的卷芯16；正极耳11、负极耳12均通过极耳胶17连接在卷芯16上，而隔膜纸13设置于卷芯16内部。
第一封装部2，用于部分包覆所述电池芯体1，电池芯体1放置于第一封装部2中，电池芯体1的正极耳11、负极耳12伸出该第一封装部2；
电解液(未图示)，被容纳于所述第一封装部2中，并浸润该电池芯体1；以及
第二封装部3，用于与第一封装部2一体拼接，从而对电池芯体1进行封装；
其中，第一封装部2为金属材料，所述第二封装部3为复合膜材料。通过使用与第一封装部2的形状匹配的封头，使作为第二封装部3的复合膜材料压合在第一封装部2上，然后通过进一步的加工手段使第二封装部3与第一封装部2一体拼接，从而实现对电池芯体1的封装。可以理解，如前所述，正极耳11、负极耳12是从该第一封装部2伸出的，电池芯体1的其余部分则被封装起来。
根据上述实施例中的软包电池，由于是金属材料和复合膜材料一体拼接进行封装，第一方面不需要强行物理冲压成型，避免了铝塑中间的铝层出现破损，从而避免潜在的漏液；第二方面利用金属材料来保护电池芯体/卷芯，避免外加挤压致正负极接触短路；第三方面省去了顶封和侧封，大大提高了空间使用率，越是小型号的电池，提升效果越明显。
在一个实施例中，金属材料为不锈钢壳，能够防止生锈。
在一个实施例中，复合膜材料为铝塑膜。
在一个实施例中，铝塑膜包括聚丙烯层。聚丙烯能够高频加热下熔化，尤其是相对于一般的复合膜材料中的其他材料层，聚丙烯在高频加热下的熔点较低，从而能够率先熔化。
在一个实施例中，不锈钢壳的形状与电池芯体匹配，从而提高空间利用率。
在一个实施例中，不锈钢壳与所述电池芯体为圆柱体、纽扣形、立方体或长方体，从而满足不同的收容空间的需要。如图1所示，本实施例中采用的形状为立方体。
图2为根据本申请的一个实施例的一种软包电池的制作方法的流程图。同时参考图1，软包电池包括电池芯体1、第一封装部2、电解液(未图示)及第二封装部3，该方法包括如下步骤：
S20：根据电池芯体1的形状，提供第一封装部2；
具体地，包括根据电池芯体1的形状，对用于制作第一封装部2的材料进行冲压等塑形处理，使之与电池芯体1的形状相匹配，从而提高空间利用率。
S21：在第一封装部2中注入电解液，以浸润电池芯体1；
具体地，在第一封装部2中放置了电池芯体1以后，可以注入电池所需的电解液，浸泡电池芯体1，确保电解反应稍后能正常进行。
S22：将第二封装部3压合到第一封装部2；
具体地，通过物理作用力，使第二封装部3与第一封装部2压合，进行初步的拼接。
S23：使第一封装部2和第二封装部3一体拼接。
具体地，可以理解，仅仅使第一封装部2和第二封装部3通过压合来拼接还不能完全对电池芯体1或者电解液进行完全密封或者封装，而对电解液进行密封或者封装是电池技术的重要指标。因此，需要采取进一步的措施使使第一封装部2和第二封装部3一体拼接，这样才能防止电解液的泄露。
根据上述实施例中的软包电池的制作方法，由于是金属材料和复合膜材料一体拼接进行封装，第一方面不需要强行物理冲压成型，避免了铝塑中间 的铝层出现破损，从而避免潜在的漏液；第二方面利用金属材料来保护电池芯体/卷芯，避免外加挤压致正负极接触短路；第三方面省去了顶封和侧封，大大提高了空间使用率，越是小型号的电池，提升效果越明显。
图3为根据另一个实施例的一种软包电池的制作方法的流程图。如图3所示，在一个实施例中，将第二封装部3压合到第一封装部2的步骤S22之前还包括：
步骤S2X：在第一封装部2与第二封装部3的拼接处添加粘合剂，该粘合剂能够与第二封装部3相熔合；
具体地，为了提高第一封装部2与第二封装部3的封装效果，可以考虑在二者的拼接处加入粘合剂，该粘合剂与第二封装部3的至少一部分材料是可以熔合的，从而能够与第二封装部3熔为一体。
图4为根据再一个实施例的一种软包电池的制作方法的流程图。如图4所示，根据该实施例，上述步骤S2X也可以是设置在提供第一封装部2的步骤S20之后。通过上述两个实施例，可以理解，粘合剂的添加其实只要在将第二封装部3压合到第一封装部2的步骤S22之前进行即可。具体是在注入电解液的步骤S21之前还是之后并无限制。
根据一个实施例，第一封装部2为金属材料。
根据一个实施例，第二封装部3为复合膜材料。
根据一个实施例，使第一封装部2和第二封装部3一体拼接的步骤S23具体包括：
使用高频封装设备对第二封装部3的外部进行高频加热，使复合膜材料部分熔化，从而与粘合剂相熔合，使得第一封装部2和第二封装部3一体拼接；其中，高频范围为30KHZ至100K HZ。
具体地，在第二封装部3的外部，尤其是在第二封装部3上与第一封装部2拼接的位置，使用高频封装设备加热。频率范围一般是30KHZ至100K HZ，加热的时间为2秒到10秒，具体需要根据具体的产品进行调整。只要能使复合材料中的部分材料熔合，与粘合剂的同类材料熔为一体即可。从而使得第一封装部2和第二封装部3一体拼接。
在一个实施例中，提供第一封装部2的步骤S20具体为：
根据电池芯体1的形状，对金属材料进行冲压，以形成第一封装部2。 可以理解，纯金属材料经受一定的冲压，形成所需的形状，一般不会造成破损。
图5为根据再一个实施例的一种软包电池的制作方法的流程图。在这个实施例中，该方法还包括：
步骤S24：使用0.1到0.5A的小电流对软包电池进行恒流充电90分钟到150分钟，以激活软包电池。
电池在制作完成以后都需要进行激活，具体技术内容在此不再赘述。
应该理解的是，虽然图2-图5的流程图中的各个步骤按照箭头的指示依次显示，但是这些步骤并不是必然按照箭头指示的顺序依次执行。除非本文中有明确的说明，这些步骤的执行并没有严格的顺序限制，这些步骤可以以其它的顺序执行。而且，图2-图5中的至少一部分步骤可以包括多个子步骤或者多个阶段，这些子步骤或者阶段并不必然是在同一时刻执行完成，而是可以在不同的时刻执行，这些子步骤或者阶段的执行顺序也不必然是依次进行，而是可以与其它步骤或者其它步骤的子步骤或者阶段的至少一部分轮流或者交替地执行。
在一个实施例中，将第二封装部3结合到第一封装部2的步骤S22具体包括：
使用封头将第二封装部3压合到第一封装部2。
由于第二封装部3是复合材料膜，其可塑性较强。通过使用与第一封装部2的形状匹配的封头，使作为第二封装部3的复合膜材料压合在第一封装部2上，然后通过进一步的加工手段使第二封装部3与第一封装部2一体拼接，从而实现对电池芯体1的封装。
在一个实施例中，金属材料为不锈钢壳，能够防止生锈。
在一个实施例中，复合膜材料为铝塑膜。
在一个实施例中，铝塑膜包括聚丙烯层，且粘合剂也包括聚丙烯。聚丙烯能够高频加热下熔化，尤其是相对于一般的复合膜材料中的其他材料层，聚丙烯在高频加热下的熔点较低，从而能够率先熔化。
以上实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形 和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (19)

  1. 一种软包电池，包括：
    电池芯体；
    第一封装部，用于部分包覆所述电池芯体；
    电解液，被容纳于所述第一封装部中，浸润所述电池芯体；以及
    第二封装部，用于与所述第一封装部一体拼接，从而对所述电池芯体进行封装；
    其中，所述第一封装部为金属材料，所述第二封装部为复合膜材料。
  2. 根据权利要求1所述的软包电池，其中所述金属材料为不锈钢壳。
  3. 根据权利要求2所述的软包电池，其中所述复合膜材料为铝塑膜。
  4. 根据权利要求3所述的软包电池，其中所述铝塑膜包括聚丙烯层。
  5. 根据权利要求2所述的软包电池，其中所述不锈钢壳的形状与所述电池芯体匹配。
  6. 根据权利要求5所述的软包电池，其中所述不锈钢壳与所述电池芯体为圆柱体、纽扣形、立方体或长方体。
  7. 一种软包电池的制作方法，所述软包电池包括电池芯体、第一封装部、电解液及第二封装部，所述方法包括：
    根据电池芯体的形状，提供所述第一封装部；
    在所述第一封装部中注入所述电解液，以浸润所述电池芯体；
    将所述第二封装部压合到所述第一封装部；以及
    使所述第一封装部和所述第二封装部一体拼接。
  8. 根据权利要求7所述的制作方法，其中所述将所述第二封装部压合到所述第一封装部之前还包括：
    在所述第一封装部与所述第二封装部的拼接处添加粘合剂，所述粘合剂能够与所述第二封装部相熔合。
  9. 根据权利要求7所述的制作方法，其中所述提供所述第一封装部之后还包括：
    在所述第一封装部与所述第二封装部的拼接处添加粘合剂，所述粘合剂能够与所述第二封装部相熔合。
  10. 根据权利要求8或9所述的制作方法，其中所述第一封装部为金属 材料。
  11. 根据权利要求8或9所述的制作方法，其中所述第二封装部为复合膜材料。
  12. 根据权利要求10所述的制作方法，其中所述使所述第一封装部和所述第二封装部一体拼接包括：
    使用高频封装设备对所述第二封装部的外部进行高频加热，使所述复合膜材料部分熔化，从而与所述粘合剂相熔合；其中，高频范围为30KHZ至100K HZ。
  13. 根据权利要求10所述的制作方法，其中所述高频加热的时长为2秒到10秒。
  14. 根据权利要求10所述的制作方法，其中所述提供所述第一封装部包括：
    根据所述电池芯体的形状，对所述金属材料进行冲压，形成所述第一封装部。
  15. 根据权利要求7所述的制作方法，其中所述将所述第二封装部压合到所述第一封装部包括：
    使用封头将所述第二封装部压合到所述第一封装部。
  16. 根据权利要求7所述的制作方法，还包括：
    使用0.1A到0.5A的小电流对所述软包电池进行恒流充电90分钟到150分钟，以激活所述软包电池。
  17. 根据权利要求9所述的制作方法，其中所述金属材料为不锈钢壳。
  18. 根据权利要求12所述的制作方法，其中所述复合材料为铝塑膜。
  19. 根据权利要求12所述的制作方法，其中所述铝塑膜包括聚丙烯层，且所述粘合剂也包括聚丙烯。
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