WO2017113097A1 - 二次电池及其制备方法 - Google Patents

二次电池及其制备方法 Download PDF

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Publication number
WO2017113097A1
WO2017113097A1 PCT/CN2015/099441 CN2015099441W WO2017113097A1 WO 2017113097 A1 WO2017113097 A1 WO 2017113097A1 CN 2015099441 W CN2015099441 W CN 2015099441W WO 2017113097 A1 WO2017113097 A1 WO 2017113097A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
casing
battery according
side walls
housing
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PCT/CN2015/099441
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English (en)
French (fr)
Inventor
李伟
於洪将
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宁德时代新能源科技股份有限公司
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Priority to PCT/CN2015/099441 priority Critical patent/WO2017113097A1/zh
Publication of WO2017113097A1 publication Critical patent/WO2017113097A1/zh

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • 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 present invention relates to the field of batteries, and in particular to a secondary battery and a method of fabricating the same.
  • 1 is a schematic view of a conventional secondary battery.
  • the pole piece gradually expands, and the expansion force of the bare cell 2 is increased. Due to the constraint of the housing 11, the bare cell 2 is front (ie, in FIG. 1 The surface of the side wall 11 facing the upper and lower sides is subjected to an increase in pressure from the casing 1, so that the bare cell 2 has a large tensile force at the inflection point P, which easily causes the pole piece to be broken, so that the bare cell 2 exists. Larger short circuit risk.
  • the expansion force increases, the electrolyte inside the bare cell 2 is gradually extruded, resulting in a decrease in the wettability of the bare cell 2.
  • the expansion force reaches a certain value, it is easy to cause the cycle decay of the secondary battery to accelerate and even dive.
  • an object of the present invention is to provide a secondary battery and a preparation method thereof, which can provide sufficient expansion space for a pole piece of a bare cell, and prevent the pole piece from being broken by internal pressure and The infiltration of the bare cell caused by the extrusion of the electrolyte is reduced, the risk of short circuit of the secondary battery is reduced, the cycle attenuation is reduced, the cycle diving is prevented, and the service life of the secondary battery is improved.
  • the present invention provides a secondary battery comprising: a case having four side walls and a bottom wall which together form an internal space; and a bare cell housed in the case Inside the body's interior space. At least one of the four side walls of the housing projects outwardly of the housing such that the interior space projects correspondingly.
  • the present invention provides a method of fabricating a secondary battery, comprising the steps of: accommodating a bare cell in an inner space of a housing, the inner space being four by a housing The side wall and a bottom wall are enclosed together; a top cover is placed on the top of the housing to enclose the bare cell In the inner space of the casing; before the liquid injection hole on the top cover of the secondary battery is closed, an inert gas is injected into the inner space through the liquid injection hole to form a constant air pressure inside the casing for a certain period of time, thereby making The respective side walls of the housing project outwardly of the housing to cause the interior space to correspondingly project.
  • the present invention provides a method of manufacturing a secondary battery, comprising the steps of: accommodating a bare cell in an inner space of a casing, the inner space being four by a casing The side wall and a bottom wall are enclosed together; a top cover is disposed on the top of the casing to enclose the bare cell in the inner space of the casing; after the liquid injection hole on the top cover of the secondary battery is closed, the The casing of the secondary battery is placed in the negative pressure tank, and the constant pressure is allowed to stand for a certain period of time, so that the respective side walls of the casing protrude outward from the casing to cause the internal space to protrude correspondingly.
  • the pole piece of the bare cell expands during use, and since the inner space accommodating the bare cell protrudes outward, the expansion piece is provided with sufficient expansion space to relieve the pole piece and the case.
  • the internal pressure between the sidewalls of the body avoids the breakage of the pole piece under the action of the internal pressure and the decrease of the bare cell wettability caused by the extrusion of the electrolyte, reduces the risk of short circuit of the secondary battery, slows the cycle attenuation and prevents the cyclical diving Improve the service life of the secondary battery.
  • the respective side walls protrude toward the outside of the casing under the action of the internal air pressure, so that the internal space is correspondingly convex.
  • the secondary battery of the first aspect of the invention is prepared; and since the force of the air pressure on the side wall is uniform, the convex surface of the side wall is more smooth and uniform.
  • the closed secondary battery is placed in a negative pressure chamber and allowed to stand at a constant pressure, and the pressure is applied to the corresponding side wall by the difference in air pressure between the inside and the outside of the casing, thereby causing the housing to be
  • the corresponding side wall protrudes outwardly of the housing to make the internal space correspondingly protrude, thereby preparing the secondary battery according to the first aspect of the present invention; and the size of the sidewall is uniform due to the difference in pressure between the inside and the outside of the housing
  • the pressure makes the convex surface of the side wall smoother and more uniform.
  • FIG. 1 is a schematic view of a conventional secondary battery
  • Figure 2 is a plan view of a secondary battery according to the present invention.
  • Figure 3 is a front elevational view of the secondary battery of Figure 2;
  • Figure 4 is a cross-sectional view of the secondary battery of Figure 2 taken along line A-A;
  • Figure 5 is a plan view of the housing of the secondary battery of Figure 3;
  • Figure 6 is a cross-sectional view of the casing of the secondary battery of Figure 3 taken along line B-B of the raised point, wherein the bare cell is removed for clarity;
  • Figure 7 is a plan view of a housing of another embodiment corresponding to Figure 5;
  • Figure 8 is a cross-sectional view of Figure 7.
  • a secondary battery according to the present invention includes: a casing 1 having four side walls 11 and a bottom wall 12 which together form an internal space S; and a bare cell 2 housed in the casing 1
  • the interior space S is inside.
  • at least one of the four side walls 11 of the housing 1 projects outwardly of the housing 1 so that the internal space S projects correspondingly.
  • the pole piece (not shown) of the bare cell 2 is inflated during use, and since the inner space S accommodating the bare cell 2 is convex outward, it provides sufficient for the pole piece.
  • the expansion space relieves the internal pressure between the pole piece and the side wall 11 of the casing 1, prevents the pole piece from being broken by the internal pressure, and the wettability of the bare cell 2 caused by the extrusion of the electrolyte is lowered, and the second is lowered.
  • the risk of short-circuit of the secondary battery slows down the cycle attenuation and prevents cyclical diving, improving the service life of the secondary battery.
  • the side wall 11 of the housing 1 projecting outward has an edge portion 111 located around the side wall 11 and a convex portion 112 is surrounded by the edge portion 111 from all sides.
  • the edge portion 111 is a shape having a constant width W.
  • the width of the edge portion 111 is 5 mm.
  • the convex point 1121 of the side wall 11 which protrudes outward from the casing 1 is located at the center of the convex portion 112 of the side wall 11. It is added here that the convex point 1121 may be located either in the center of the convex portion 112 of the side wall 11 or in a region around the center of the convex portion 112 of the side wall 11.
  • the vertical distance of the plane formed by the convex point 1121 to the edge where the convex portion 112 is connected to the edge portion 111 is a convex value C, convex
  • the degree C can be from 0.1 mm to 3 mm. It is added here that, in order to facilitate the measurement, the corresponding corresponding side walls 11 are measured from the outside of the housing 1 to indirectly reflect the extent to which the internal space S is correspondingly convex.
  • At least two of the four side walls 11 of the casing 1 project outwardly from the casing 1.
  • the difference in crown values C of any two outwardly projecting side walls 11 of the casing 1 is less than 0.5 mm.
  • each of the side walls 11 of the casing 1 may have a thickness of 0.05 mm to 3 mm.
  • the bare cell 2 may be a wound cell, a laminated cell, or a wound plus laminated cell.
  • two of the four side walls 11 of the housing 1 having opposite side walls 11 are convex toward the housing 1. Out.
  • two of the four side walls 11 of the housing 1 have opposite side walls 11 having a small surface area toward the housing. 1 protruding outside.
  • the housing 1 may be a hard case.
  • the hard shell can be an aluminum shell or a steel shell.
  • the coordinate data of each point on the outwardly convex side wall 11 of the housing 1 is scanned by a flat measuring instrument, and the edge of the side wall 11 is automatically removed.
  • the data point of the portion 111 (the plane measuring instrument is set according to the edge portion width), and then the obtained data is fitted to a curved surface to obtain the height difference between the highest point and the lowest point of the curved surface, that is, the side wall 11
  • the convexity value C and verify whether the convexity value C is within the allowable range of the qualified battery.
  • the plane measuring instrument can use the core flatness tester of Zhengye Technology ASIDA-PM1000 model.
  • the method for producing a secondary battery according to the present invention is for preparing the secondary battery according to the first aspect of the present invention, comprising the steps of: accommodating the bare cell 2 in the internal space S of the casing 1.
  • the inner space S is enclosed by the four side walls 11 of the casing 1 and one bottom wall 12; the top cover 3 is placed on the top of the casing 1 to enclose the bare cell 2 in the inner space of the casing 1.
  • the respective side walls 11 protrude outward from the casing 1 by the internal air pressure, so that The internal space S is correspondingly protruded to prepare the secondary battery of the first aspect of the invention; and since the force of the air pressure on the side wall 11 is uniform, the convex surface of the side wall 11 is more smoothly and uniform.
  • the constant gas pressure may be from 30 KPa to 250 KPa.
  • the constant gas pressure may be applied for a period of from 3 s to 60 s.
  • the top cover 3 and the bottom wall 12 of the casing 1 and others are all externally constrained without bulging deformation.
  • a flat jig can be used to abut against the other side walls 11, the bottom wall 12 and the top cover 3 which do not need to be protruded.
  • the side wall 11, the bottom wall 12, and the top cover 3, which do not need to be convex, are constrained to protrude outward.
  • a method of manufacturing a secondary battery according to the present invention is for producing a secondary battery according to a first aspect of the present invention, comprising the steps of: accommodating a bare cell 2 in an internal space S of a casing 1.
  • the inner space S is surrounded by the four side walls 11 of the casing 1 and one bottom wall 12; the top cover 3 is placed on the top of the casing 1 to enclose the bare cell 2 inside the casing 1.
  • the closed secondary battery is placed in a negative pressure chamber and allowed to stand at a constant pressure, and the pressure is applied to the corresponding side wall 11 by the difference in air pressure between the inside and the outside of the casing 1, thereby causing the shell
  • the corresponding side wall 11 of the body 1 protrudes outwardly of the casing 1 so that the internal space S protrudes correspondingly, thereby preparing the secondary battery of the first aspect of the invention; and due to the difference in pressure between the inside and the outside of the casing 1
  • the uniform pressure on the side wall 11 makes the convex surface of the side wall 11 smoother and more uniform.
  • the relative pressure in the negative pressure tank is from -150 KPa to -80 KPa.
  • the housing 1 of the secondary battery is allowed to stand at a constant pressure for 15 minutes to 200 minutes.
  • the top cover 3 and the bottom wall 12 of the casing 1 and others are all externally constrained without bulging deformation.
  • a flat jig can be used to abut against the other side walls 11, the bottom wall 12 and the top cover 3 which do not need to be protruded.
  • the side wall 11, the bottom wall 12, and the top cover 3, which do not need to be convex, are constrained to protrude outward.

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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)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本发明提供了一种二次电池及其制备方法，二次电池包括：壳体，具有一起围成内部空间的四个侧壁和一个底壁；以及裸电芯，收容于壳体的内部空间内。壳体的四个侧壁中至少一个侧壁向壳体外凸出，以使所述内部空间相应地凸出。在根据本发明的二次电池中，裸电芯的极片在使用过程中膨胀，而由于收容裸电芯的内部空间向外凸出，为极片提供足够的膨胀空间，缓解极片与壳体的侧壁之间的内部压力，避免极片在该内部压力的作用下断裂以及电解液被挤出导致的裸电芯浸润性降低，降低二次电池短路风险，减缓循环衰减并防止循环跳水，提高二次电池使用寿命。

Description

二次电池及其制备方法 技术领域
本发明涉及电池领域，尤其涉及一种二次电池及其制备方法。
背景技术
图1为现有的二次电池的示意图。
参照图1，在现有的二次电池的使用过程中，极片逐渐膨胀，裸电芯2所受膨胀力增大，由于壳体11的约束，裸电芯2正面(即在图1中面向的上下两侧的侧壁11的表面)所承受来自壳体1的压力增大，使得裸电芯2在拐点P处拉伸力较大，易导致极片断裂，使得裸电芯2存在较大的短路风险。
此外，随着膨胀力增大，裸电芯2内部的电解液逐渐被挤出，从而导致裸电芯2的浸润性降低。当膨胀力达到一定值时，易导致二次电池的循环衰减加速，甚至跳水。
发明内容
鉴于背景技术中存在的问题，本发明的目的在于提供一种二次电池及其制备方法，其能为裸电芯的极片提供足够的膨胀空间，避免极片在内部压力的作用下断裂以及电解液被挤出导致的裸电芯浸润性降低，降低二次电池短路风险，减缓循环衰减并防止循环跳水，提高二次电池使用寿命。
为了实现上述目的，在第一方面，本发明提供了一种二次电池，其包括：壳体，具有一起围成内部空间的四个侧壁和一个底壁；以及裸电芯，收容于壳体的内部空间内。壳体的四个侧壁中至少一个侧壁向壳体外凸出，以使所述内部空间相应地凸出。
为了实现上述目的，在第二方面，本发明提供了一种二次电池的制备方法，其包括步骤：将裸电芯收容于壳体的内部空间内，所述内部空间由壳体的四个侧壁和一个底壁一起围成；将顶盖设置于壳体的顶部以将裸电芯封闭 在壳体的内部空间内；在二次电池的顶盖上的注液孔封闭前，通过注液孔向内部空间注入惰性气体以在壳体的内部形成恒定的气压，保持一段时间，从而使得壳体的相应侧壁向壳体外凸出，以使内部空间相应地凸出。
为了实现上述目的，在第三方面，本发明提供了一种二次电池的制备方法，其包括步骤：将裸电芯收容于壳体的内部空间内，所述内部空间由壳体的四个侧壁和一个底壁一起围成；将顶盖设置于壳体的顶部以将裸电芯封闭在壳体的内部空间内；在二次电池的顶盖上的注液孔封闭后，将所述二次电池的壳体放置在负压箱内，恒压静置一段时间，从而使得壳体的相应侧壁向壳体外凸出，以使内部空间相应地凸出。
本发明的有益效果如下：
在根据本发明的二次电池中，裸电芯的极片在使用过程中膨胀，而由于收容裸电芯的内部空间向外凸出，为极片提供足够的膨胀空间，缓解极片与壳体的侧壁之间的内部压力，避免极片在该内部压力的作用下断裂以及电解液被挤出导致的裸电芯浸润性降低，降低二次电池短路风险，减缓循环衰减并防止循环跳水，提高二次电池使用寿命。
在根据本发明的二次电池的制备方法中，利用向壳体的内部空间注入惰性气体并形成恒定的气压，在内部气压的作用下相应侧壁向壳体外凸出，使内部空间相应地凸出，以制备出本发明第一方面所述的二次电池；而由于气压在侧壁上的作用力大小均匀，使得侧壁的凸面更为平滑均匀。
在根据本发明的二次电池的制备方法中，将封闭的二次电池放置在负压箱内恒压静置，利用壳体内外的气压差对相应的侧壁施加压力，从而使得壳体的相应侧壁向壳体外凸出，以使内部空间相应地凸出，进而制备出本发明第一方面所述的二次电池；而由于利用壳体的内外气压差在侧壁上的大小均匀的压力，使得侧壁的凸面更为平滑均匀。
附图说明
图1为现有的二次电池的示意图；
图2为根据本发明的二次电池的俯视图；
图3为图2的二次电池的正视图；
图4为图2的二次电池的沿线A-A作出的剖视图；
图5为图3的二次电池的壳体的俯视图；
图6为图3的二次电池的壳体沿通过凸起点的B-B线作出的截面图，其中为了清楚起见，去除裸电芯；
图7为与图5对应的另一实施例的壳体的俯视图；
图8为图7的截面图。
其中，附图标记说明如下：
1壳体              2裸电芯
11侧壁             3顶盖
111边缘部            31注液孔
112凸部            C凸度值
1121凸起点         P拐点
12底壁             W宽度
S内部空间
具体实施方式
下面参照附图来详细说明本发明的二次电池及其制备方法。
首先说明根据本发明第一方面的二次电池。
参照图2至图8，根据本发明的二次电池包括：壳体1，具有一起围成内部空间S的四个侧壁11和一个底壁12；以及裸电芯2，收容于壳体1的内部空间S内。其中，壳体1的四个侧壁11中至少一个侧壁11向壳体1外凸出，以使内部空间S相应地凸出。
在根据本发明的二次电池中，裸电芯2的极片(未示出)在使用过程中膨胀，而由于收容裸电芯2的内部空间S向外凸出，为极片提供足够的膨胀空间，缓解极片与壳体1的侧壁11之间的内部压力，避免极片在该内部压力的作用下断裂以及电解液被挤出导致的裸电芯2的浸润性降低，降低二次电池短路风险，减缓循环衰减并防止循环跳水，提高二次电池使用寿命。
在根据本发明的二次电池中，参照图2至图8，在一实施例中，壳体1向外凸出的侧壁11具有：边缘部111，位于该侧壁11四周；以及凸部112，被边缘部111从四周包围。
在根据本发明的二次电池中，参照图3，在一实施例中，边缘部111为宽度W恒定的回形。
在根据本发明的二次电池中，在一实施例中，边缘部111的宽度为5mm。
在根据本发明的二次电池中，参照图2至图8，在一实施例中，向壳体1外凸出的侧壁11的凸起点1121位于该侧壁11的凸部112的中心。在此补充的是，凸起点1121既可以位于该侧壁11的凸部112的正中央，也可以位于该侧壁11的凸部112正中央周围的区域内。
在根据本发明的二次电池中，参照图5至图8，在一实施例中，凸起点1121到凸部112与边缘部111连接的边缘形成的平面的垂直距离为凸度值C，凸度值C可为0.1mm～3mm。在此补充说明的是，为了方便测量，从壳体1外部对凸出的相应侧壁11进行测量，以间接地反映内部空间S相应凸出的程度。
在根据本发明的二次电池中，参照图2至图8，在一实施例中，壳体1的四个侧壁11中的至少两个侧壁11向壳体1外凸出。
在根据本发明的二次电池中，在一实施例中，壳体1的任意两个向外凸出的侧壁11的凸度值C之差小于0.5mm。
在根据本发明的二次电池中，在一实施例中，壳体1的各个侧壁11的厚度可为0.05mm～3mm。
在根据本发明的二次电池中，在一实施例中，裸电芯2可为卷绕式电芯、叠片式电芯或卷绕加叠片式电芯。
在根据本发明的二次电池中，参照图2至图8，在一实施例中，壳体1的四个侧壁11中的两个相对的表面积大的侧壁11向壳体1外凸出。
在根据本发明的二次电池中，参照图3、图5及图6，在一实施例中，壳体1的四个侧壁11中的两个相对的表面积小的侧壁11向壳体1外凸出。
在根据本发明的二次电池中，在一实施例中，壳体1可为硬壳。硬壳可为铝壳或钢壳。
在根据本发明的二次电池中，在一实施例中，采用平面测量仪扫描壳体1向外凸出的侧壁11上的各点坐标数据输入计算机，并自动去除该侧壁11的边缘部111的数据点(根据边缘部宽度设定平面测量仪)，然后将得到的数据拟合出一个曲面，得到该曲面最高点与最低点的高度差，即该侧壁11 的凸度值C，并检验该凸度值C是否在合格电池允许的范围内。平面测量仪可采用正业科技ASIDA-PM1000型号的电芯平面度测试仪。
其次说明根据本发明第二方面的二次电池的制备方法。
参照图2至图8，根据本发明的二次电池的制备方法用于制备本发明第一方面所述的二次电池，包括步骤：将裸电芯2收容于壳体1的内部空间S内，所述内部空间S由壳体1的四个侧壁11和一个底壁12一起围成；将顶盖3设置于壳体1的顶部以将裸电芯2封闭在壳体1的内部空间S内；在二次电池的顶盖3上的注液孔31封闭前，通过注液孔31向内部空间S注入惰性气体以在壳体1的内部形成恒定的气压，保持一段时间，从而使得壳体1的相应侧壁11向壳体1外凸出，以使内部空间S相应地凸出。
在根据本发明的二次电池的制备方法中，利用向壳体1的内部空间S注入惰性气体并形成恒定的气压，在内部气压的作用下相应侧壁11向壳体1外凸出，使内部空间S相应地凸出，以制备出本发明第一方面所述的二次电池；而由于气压在侧壁11上的作用力大小均匀，使得侧壁11的凸面更为平滑均匀。
在根据本发明的二次电池的制备方法中，在一实施例中，所述恒定的气压可为30KPa～250KPa。
在根据本发明的二次电池的制备方法中，在一实施例中，所述恒定的气压作用的时间可为3s～60s。
在根据本发明的二次电池的制备方法中，在一实施例中，在壳体1的相应侧壁11向壳体1外凸出时，顶盖3以及壳体1的底壁12和其它的侧壁11均受外部限制而无凸出变形。根据二次电池的需求，壳体1的部分侧壁11向壳体1外凸出时，可以采用平面夹具抵靠在其他不需要凸出的侧壁11、底壁12以及顶盖3上，以限制不需要凸出的侧壁11、底壁12以及顶盖3向外凸出。
最后说明根据本发明第三方面的二次电池的制备方法。
参照图2至图8，根据本发明的二次电池的制备方法用于制备本发明第一方面所述的二次电池，包括步骤：将裸电芯2收容于壳体1的内部空间S 内，所述内部空间S由壳体1的四个侧壁11和一个底壁12一起围成；将顶盖3设置于壳体1的顶部以将裸电芯2封闭在壳体1的内部空间S内；在二次电池的顶盖3上的注液孔31封闭后，将所述二次电池的壳体1放置在负压箱内，恒压静置一段时间，从而使得壳体1的相应侧壁11向壳体1外凸出，以使内部空间S相应地凸出。
在根据本发明的二次电池的制备方法中，将封闭的二次电池放置在负压箱内恒压静置，利用壳体1内外的气压差对相应的侧壁11施加压力，从而使得壳体1的相应侧壁11向壳体1外凸出，以使内部空间S相应地凸出，进而制备出本发明第一方面所述的二次电池；而由于利用壳体1的内外气压差在侧壁11上的大小均匀的压力，使得侧壁11的凸面更为平滑均匀。
在根据本发明的二次电池的制备方法中，在一实施例中，所述负压箱内的相对压强为-150KPa～-80KPa。
在根据本发明的二次电池的制备方法中，在一实施例中，所述二次电池的壳体1恒压静置的时间为15min～200min。
在根据本发明的二次电池的制备方法中，在一实施例中，在壳体1的相应侧壁11向壳体1外凸出时，顶盖3以及壳体1的底壁12和其它的侧壁11均受外部限制而无凸出变形。根据二次电池的需求，壳体1的部分侧壁11向壳体1外凸出时，可以采用平面夹具抵靠在其他不需要凸出的侧壁11、底壁12以及顶盖3上，以限制不需要凸出的侧壁11、底壁12以及顶盖3向外凸出。

Claims (21)

  1. 一种二次电池，包括：
    壳体(1)，具有一起围成内部空间(S)的四个侧壁(11)和一个底壁(12)；以及
    裸电芯(2)，收容于壳体(1)的内部空间(S)内；
    其特征在于，
    壳体(1)的四个侧壁(11)中至少一个侧壁(11)向壳体(1)外凸出，以使所述内部空间(S)相应地凸出。
  2. 根据权利要求1所述的二次电池，其特征在于，壳体(1)向外凸出的侧壁(11)具有：
    边缘部(111)，位于该侧壁(11)的四周；以及
    凸部(112)，被边缘部(111)从四周包围。
  3. 根据权利要求2所述的二次电池，其特征在于，边缘部(111)为宽度W恒定的回形。
  4. 根据权利要求3所述的二次电池，其特征在于，边缘部(111)的宽度为5mm。
  5. 根据权利要求2所述的二次电池，其特征在于，向壳体(1)外凸出的侧壁(11)的凸起点(1121)位于该侧壁(11)的凸部(112)的中心。
  6. 根据权利要求5所述的二次电池，其特征在于，凸起点(1121)到凸部(112)与边缘部(111)连接的边缘形成的平面的垂直距离为凸度值(C)，凸度值(C)为0.1mm～3mm。
  7. 根据权利要求6所述的二次电池，其特征在于，壳体(1)的四个侧壁(11)中的至少两个侧壁(11)向壳体(1)外凸出。
  8. 根据权利要求7所述的二次电池，其特征在于，壳体(1)的任意两个向外凸出的侧壁(11)的凸度值(C)之差小于0.5mm。
  9. 根据权利要求1所述的二次电池，其特征在于，壳体(1)的各个侧壁(11)的厚度为0.05mm～3mm。
  10. 根据权利要求1所述的二次电池，其特征在于，裸电芯(2)为卷绕式电芯、叠片式电芯或卷绕加叠片式电芯。
  11. 根据权利要求1所述的二次电池，其特征在于，壳体(1)的四个侧壁(11)中的两个相对的表面积大的侧壁(11)向壳体(1)外凸出。
  12. 根据权利要求1所述的二次电池，其特征在于，壳体(1)为硬壳。
  13. 根据权利要求12所述的二次电池，其特征在于，硬壳为铝壳或钢壳。
  14. 一种二次电池的制备方法，用于制备权利要求1～13中任一项所述的二次电池，包括步骤：
    将裸电芯(2)收容于壳体(1)的内部空间(S)内，所述内部空间(S)由壳体(1)的四个侧壁(11)和一个底壁(12)一起围成；将顶盖(3)设置于壳体(1)的顶部以将裸电芯(2)封闭在壳体(1)的内部空间(S)内；
    在二次电池的顶盖(3)上的注液孔(31)封闭前，通过注液孔(31)向内部空间(S)注入惰性气体以在壳体(1)的内部形成恒定的气压，保持一段时间，从而使得壳体(1)的相应侧壁(11)向壳体(1)外凸出，以使内部空间(S)相应地凸出。
  15. 根据权利要求14所述的二次电池的制备方法，其特征在于，所述恒定的气压为30KPa～250KPa。
  16. 根据权利要求14所述的二次电池的制备方法，其特征在于，所述恒定的气压作用的时间为3s～60s。
  17. 根据权利要求14所述的二次电池的制备方法，其特征在于，在壳体(1)的相应侧壁(11)向壳体(1)外凸出时，顶盖(3)以及壳体(1)的底壁(12)和其它的侧壁(11)均受外部限制而无凸出变形。
  18. 一种二次电池的制备方法，用于制备权利要求1～13中任一项所述的二次电池，包括步骤：
    将裸电芯(2)收容于壳体(1)的内部空间(S)内，所述内部空间(S)由壳体(1)的四个侧壁(11)和一个底壁(12)一起围成；将顶盖(3)设置于壳体(1)的顶部以将裸电芯(2)封闭在壳体(1)的内部空间(S)内；
    在二次电池的顶盖(3)上的注液孔(31)封闭后，将所述二次电池的壳体(1)放置在负压箱内，恒压静置一段时间，从而使得壳体(1)的相应侧壁(11)向壳体(1)外凸出，以使内部空间(S)相应地凸出。
  19. 根据权利要求18所述的二次电池的制备方法，其特征在于，所述负压箱内的相对压强为-150KPa～-80KPa。
  20. 根据权利要求18所述的二次电池的制备方法，其特征在于，所述二次电池的壳体(1)恒压静置的时间为15min～200min。
  21. 根据权利要求18所述的二次电池的制备方法，其特征在于，在壳体(1)的相应侧壁(11)向壳体(1)外凸出时，顶盖(3)以及壳体(1)的底壁(12)和其它的侧壁(11)均受外部限制而无凸出变形。
PCT/CN2015/099441 2015-12-29 2015-12-29 二次电池及其制备方法 WO2017113097A1 (zh)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1728436A (zh) * 2004-07-29 2006-02-01 三星Sdi株式会社 二次电池
CN200969361Y (zh) * 2006-09-26 2007-10-31 比亚迪股份有限公司 一种锂离子电池壳体及包括该壳体的锂离子电池

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1728436A (zh) * 2004-07-29 2006-02-01 三星Sdi株式会社 二次电池
CN200969361Y (zh) * 2006-09-26 2007-10-31 比亚迪股份有限公司 一种锂离子电池壳体及包括该壳体的锂离子电池

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