WO2021129449A1 - 电芯及具有该电芯的电池 - Google Patents

电芯及具有该电芯的电池 Download PDF

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Publication number
WO2021129449A1
WO2021129449A1 PCT/CN2020/136334 CN2020136334W WO2021129449A1 WO 2021129449 A1 WO2021129449 A1 WO 2021129449A1 CN 2020136334 W CN2020136334 W CN 2020136334W WO 2021129449 A1 WO2021129449 A1 WO 2021129449A1
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WO
WIPO (PCT)
Prior art keywords
battery
area
adhesive
sided
pole piece
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PCT/CN2020/136334
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English (en)
French (fr)
Inventor
宋传涛
李保章
苏义松
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宁德新能源科技有限公司
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Publication of WO2021129449A1 publication Critical patent/WO2021129449A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/30—Preventing polarity reversal
    • 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

  • This application relates to the field of batteries, in particular to batteries and batteries with the batteries.
  • the application also provides a battery with the battery cell.
  • a battery cell includes a winding unit formed by a first pole piece, an isolation film, and a second pole piece.
  • the winding unit is wound to form the battery core, the first pole piece and/or the second pole piece
  • a blank area is provided at the winding start end of the diode piece, and the battery cell further includes:
  • the first adhesive is arranged between the blank area and the isolation film, and the blank area is a blank current collector with no active material layer on both sides.
  • a battery includes the above-mentioned electric core, a packaging shell and a second adhesive, the packaging shell covers the electric core, and the second adhesive is arranged between the electric core and the packaging shell.
  • the first pole piece includes a first current collector and a first active material layer respectively disposed on both sides of the first current collector
  • the second pole piece includes a second current collector and is respectively disposed on the first active material layer.
  • the second active material layer on both sides of the second current collector.
  • the first pole piece includes a first blank area, a first single-sided area, and a first double-sided area arranged in sequence, and the first blank area and the isolation film are provided between the first blank area and the isolation film. glue.
  • the first single-sided area includes a first surface facing the center of the battery cell, and the first surface is not provided with the first active material layer, wherein the first surface and the isolation The first adhesive is provided between the films.
  • the first pole piece includes a first single-sided area and a first double-sided area arranged in sequence, the first single-sided area includes a first surface facing the center of the cell, and the first The first active material layer is not provided on the surface, and the first adhesive is provided between the first surface and the isolation film.
  • the second pole piece includes a second blank area, a second double-sided area, a second single-sided area, and a third blank area arranged in sequence, and the second blank area is arranged between the isolation film and the second blank area.
  • the second single-sided area includes a second surface facing away from the center of the battery cell, and the second surface is not provided with the second active material layer, wherein the second surface is located at the outermost ring of the battery cell
  • the second adhesive is arranged between part of the second surface and the packaging shell and between the outer surface of the third blank area and the packaging shell.
  • the first pole piece includes a first blank area, a third single-sided area, and a third double-sided area arranged in sequence, and the third single-sided area includes a third surface facing the center of the cell , The third surface is not provided with the first active material layer, and the first adhesive is provided between the first blank area and the isolation film and between the third surface and the isolation film Agent.
  • the second pole piece includes a fourth double-sided area, a fourth single-sided area, and a fourth blank area sequentially arranged, and the fourth single-sided area includes a fourth single-sided area facing away from the center of the battery cell.
  • the fourth surface is not provided with the second active material layer, the fourth single-sided area and the fourth blank area are located on the outermost circle of the battery, the outer surface of the fourth blank area
  • the second adhesive is provided between the packaging shell and between the fourth surface and the packaging shell.
  • the first adhesive is glue or adhesive paper, wherein the fracture stress of the adhesive paper is not more than 5000 N/m, and the fracture strain is not more than 200%.
  • the arrangement of the first adhesive strengthens the connection between the pole piece and the isolation film inside the battery, thereby greatly improving the rigidity of the battery, and thereby preventing the battery from leaking when subjected to mechanical shocks. Liquid, fire and other phenomena.
  • the inner interface of the battery is bonded firmly; in this way, when the battery is stressed due to mechanical impact, the entire battery can be quickly broken and separated from the stress point, so that the battery The core does not have to withstand continuous squeezing force to reduce the risk of short circuit of the battery.
  • FIG. 1 is a schematic diagram of the structure of a battery according to an embodiment of the application.
  • FIG. 2 is a schematic structural diagram of a battery according to another embodiment of the application.
  • Fig. 3 is a schematic cross-sectional view of a winding unit in the battery core shown in Fig. 1.
  • Fig. 4 is a schematic cross-sectional view of the first pole piece shown in Fig. 1.
  • Fig. 5 is a schematic cross-sectional view of the second pole piece shown in Fig. 1.
  • FIG. 6 is a schematic cross-sectional view of a first pole piece according to an embodiment of the application.
  • FIG. 7 is a schematic cross-sectional view of the first pole piece shown in FIG. 2.
  • FIG. 8 is a schematic cross-sectional view of the second pole piece shown in FIG. 2.
  • FIG. 9 is a schematic diagram of the structure of the middle area of the battery shown in FIG. 1.
  • FIG. 10 is a schematic diagram of a part of the structure of the battery shown in FIG. 1.
  • FIG. 11 is a schematic diagram of the structure of the middle area of the battery shown in FIG. 2.
  • FIG. 12 is a schematic diagram of part of the structure of the battery shown in FIG. 2.
  • FIG. 13 is a schematic diagram of the structure of the battery shown in FIG. 1 without a second adhesive.
  • FIG. 14 is a schematic diagram of the structure without the second adhesive in the battery shown in FIG. 2.
  • FIG. 15 is a schematic diagram of the structure of the battery of Comparative Example 1 in this application.
  • FIG. 16 is a schematic diagram of the structure of the battery of Comparative Example 2 in this application.
  • the first blank area 1111 is the first blank area 1111
  • the third single-sided area 1115 is the third single-sided area 1115
  • the third double-sided zone 1116 is the third double-sided zone 1116
  • the first adhesive 12 is the first adhesive 12
  • the blank area is a blank current collector with active materials on both sides; a single-sided area is an area where one side of the current collector is provided with an active material and the other side is not provided with an active material; a double-sided area is an area where both sides of the current collector are Set up areas with active substances.
  • an embodiment of the present application provides a battery 100.
  • the battery 100 includes a battery cell 10.
  • the battery core 10 includes a winding unit 11 formed by a first pole piece 111, an isolation film 112 and a second pole piece 113.
  • the winding unit 11 winds to form the battery core 10.
  • the isolation film 112 is located between the first pole piece 111 and the second pole piece 113.
  • the winding start end of the first pole piece 111 is provided with a first blank area 1111 (refer to FIG. 4) or/and the winding start end of the second pole piece 113 is provided with a second blank area 1131 (refer to Figure 5).
  • the battery core 10 further includes a first adhesive 12.
  • the first adhesive 12 is disposed between the first blank area 1111 and the isolation film 112 or/and between the second blank area 1131 and the isolation film 112.
  • the setting of the first adhesive 12 solves the problem of no adhesive force when the first blank area 1111 is in direct contact with the isolation film 112 or/and when the second blank area 1131 is in direct contact with the isolation film 112. Therefore, the rigidity of the battery core 10 is increased, and the anti-drop performance of the battery 100 is improved.
  • the adhesive force between the first blank area 1111 and the isolation film 112 is greater than 2N/m
  • the second blank area 1131 The adhesive force with the isolation film 112 is greater than 2N/m.
  • the battery 100 further includes a packaging case 20 and a second adhesive 30.
  • the packaging shell 20 covers the battery core 10.
  • the second adhesive 30 is disposed between the battery core 10 and the packaging case 20.
  • the arrangement of the second adhesive 30 not only increases the adhesive force between the battery core 10 and the packaging case 20, but also improves the rigidity of the battery 100. In this way, because the second adhesive 30 firmly connects the battery core 10 and the packaging shell 20 together, even if the battery 100 is dropped or impacted, the battery core 10 and the packaging shell There will be no relative displacement between 20, so the head and tail of the packaging case 20 will not be impacted by the battery core 10, and the battery 100 will leak or the packaging case 20 cannot be caused by problems such as being flushed or fatigued. Continue to block the external water vapor situation.
  • the adhesive force between the battery core 10 and the packaging case 20 is not less than 10 N/m.
  • the connection manner in which the second adhesive 30 is provided between the battery core 10 and the packaging shell 20 will affect the anti-drop performance of the battery 100.
  • the fracture stress refers to the maximum tensile force that an object can withstand under the action of an external force in a certain direction.
  • the fracture strain refers to the degree of deformation of an object under the action of an external force.
  • the first adhesive 12 and the second adhesive 30 may be glue or adhesive paper.
  • the fracture stress of the first adhesive 12 is not more than 5000 N/m, and the fracture strain is not more than 200%.
  • the battery 100 further includes a first tab 40 and a second tab 50.
  • the first tab 40 is disposed on the first pole piece 111
  • the second tab 50 is disposed on the second pole piece 113.
  • the first pole piece 111 includes a first current collector 114 and a first active material layer 115 respectively disposed on both sides of the first current collector 114.
  • the second pole piece 113 includes a second current collector 116 and a second active material layer 117 respectively disposed on both sides of the second current collector 116.
  • the first blank area 1111 is an area where the first active material layer 115 is not provided on both sides of the first current collector 114, and the second blank area 1131 is two areas of the second current collector 116. There is no area provided with the second active material layer 117 on either side.
  • the battery 100 includes a battery cell 10, a packaging case 20 and a second adhesive 30.
  • the packaging shell 20 covers the battery core 10.
  • the second adhesive 30 is disposed between the battery core 10 and the packaging case 20.
  • the battery core 10 includes a winding unit 11 formed by a first pole piece 111, an isolation film 112 and a second pole piece 113. The winding unit 11 winds to form the battery core 10.
  • the first pole piece 111 includes the first blank area 1111, a first single-sided area 1112 and a first double-sided area 1113 arranged in sequence.
  • the first single-sided area 1112 includes a first surface 1114 facing the center of the cell 10.
  • the first surface 1114 is not provided with a first active material layer 115.
  • the first surface 1114 is the surface of the first current collector 114 where the first active material layer 115 is not provided.
  • the cell 10 further includes a first adhesive 12.
  • the first adhesive 12 is provided between the first blank area 1111 and the isolation film 112 and between the first surface 1114 and the isolation film 112.
  • the second pole piece 113 includes a second blank area 1131, a second double-sided area 1132, a second single-sided area 1133, and a third blank area 1134 that are sequentially arranged.
  • the first adhesive 12 is provided between the second blank area 1131 and the isolation film 112.
  • the second single-sided region 1133 includes a second surface 1135 facing away from the center of the cell 10.
  • the second surface 1135 is not provided with a second active material layer 117.
  • the second surface 1135 is the surface of the second current collector 116 where the second active material layer 117 is not provided.
  • the second adhesive 30 is provided between the second surface 1135 of the outermost part of the battery core 10 and the packaging shell 20 and between the outer surface of the third blank area 1134 and the packaging shell 20.
  • Embodiment 2 lies in the structure of the first pole piece 111 and the position where the first adhesive 12 is disposed.
  • the first pole piece 111 includes a first single-sided area 1112 and a first double-sided area 1113 arranged in sequence.
  • the first adhesive 12 is disposed between the first surface 1114 and the isolation film 112.
  • Embodiment 3 the difference between Embodiment 3 and Embodiment 2 lies in the structure of the first pole piece 111, the structure of the second pole piece 113, the location where the first adhesive 12 is set, and the location where the second adhesive is set.
  • the first pole piece 111 includes the first blank area 1111, the third single-sided area 1115, and the third double-sided area 1116 arranged in sequence.
  • the third single-sided area 1115 includes a third surface 1117 facing the center of the cell 10.
  • the third surface 1117 is not provided with the first active material layer 115.
  • the third surface 1117 is the surface of the first current collector 114 where the first active material layer 115 is not provided.
  • the first adhesive 12 is provided between the first blank area 1111 and the isolation film 112 and between the third surface 1117 and the isolation film 112.
  • the second pole piece 113 includes a fourth double-sided area 1136, a fourth single-sided area 1137 and a fourth blank area 1138 that are sequentially arranged.
  • the fourth single-sided area 1137 includes a fourth surface 1139 facing away from the center of the cell 10.
  • the fourth surface 1139 is not provided with the second active material layer 117.
  • the fourth surface 1139 is the surface of the second current collector 116 where the second active material layer 117 is not provided.
  • the fourth single-sided area 1137 and the fourth blank area 1138 are located at the outermost circle of the battery cell.
  • the second adhesive 30 is provided between the outer surface of the fourth blank area 1138 and the packaging shell 20 and between the fourth surface 1139 and the packaging shell 20.
  • Embodiment 4 differs from Embodiment 1 in that the battery 100 of Embodiment 4 does not include the second adhesive 30.
  • Embodiment 5 differs from Embodiment 3 is that the battery 100 of Embodiment 5 does not have the second adhesive 30.
  • Comparative Example 1 the difference between Comparative Example 1 and Example 4 is that the battery 100 of Comparative Example 1 does not have the first adhesive 12.
  • Comparative Example 2 differs from Comparative Example 5 because the battery 100 of Comparative Example 2 does not have the first adhesive 12.
  • the battery 100 involved in Example 1, Example 3, Example 4, Example 5, and Comparative Example 1-2 is a square battery.
  • the battery 100 involved in Example 1, Example 3, Example 4, Example 5, and Comparative Example 1-2 was subjected to a six-sided four-corner drop test.
  • the test height is 1.5m, and there are ten rounds in total. Among them, the six sides and four corners fell into one round.
  • the battery if the battery does not leak, does not generate heat, and the voltage drop is less than 30mV, it means that the battery has passed the drop test.
  • Table 1 is a comparison table of the pass rate of the drop test of Example 1, Example 3, Example 4, Example 5 and Comparative Example 1-2.
  • Example 3 Example 4
  • Example 5 Comparative example 1 Comparative example 2 Passing rate 100% 100% 60% 80% 50% 60%
  • the shape of the battery 100 is not limited to a square shape, and may also be a regular shape such as a columnar shape or other irregular shapes.
  • the arrangement of the first adhesive 12 strengthens the connection between the pole pieces inside the battery cell 10 and the isolation film 112, thereby greatly improving the rigidity of the battery 100, thereby making the battery 100 to withstand mechanical shocks. There will be no leakage, fire, etc. at the same time.
  • the inner interface of the battery cell 10 is firmly bonded; in this way, when the battery 100 is stressed due to mechanical impact, the entire battery 100 can be quickly broken from the stress point. Separate, so that the battery core 10 does not have to bear continuous squeezing force, so as to reduce the risk of short circuit of the battery core 10.

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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)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种电芯（10），包括由第一极片（111）、隔离膜（112）和第二极片（113）形成的卷绕单元（11）。所述卷绕单元（11）卷绕形成所述电芯（10）。所述第一极片（111）的卷绕起始端设有第一空白区（1111）或/和第二极片（113）的卷绕起始端设有第二空白区（1131）。所述电芯（10）还包括第一粘接剂（12）。所述第一粘接剂（12）设置于所述第一空白区（1111）与所述隔离膜（112）之间或/和设置于所述第二空白区（1131）和所述隔离膜（112）之间，使得电芯（10）具有较高的抗跌落性能。还提供了一种具有该电芯（10）的电池（100）。

Description

电芯及具有该电芯的电池 技术领域
本申请涉及电池领域，具体涉及电芯及具有该电芯的电池。
背景技术
目前的电池结构中，包裹电芯的包装壳与电芯之间无连接。如此，当电池结构受到外界机械冲击(比如跌落、碰撞等)时，电芯和包装壳之间会产生相对位移，而包装壳的头部就会受到电芯的冲击。若电池结构发生反复多次的机械冲击时，将出现包装壳的封边被冲开或包装壳疲劳损伤等问题所导致的电池漏液或包装壳无法继续阻隔外界水汽的状况。另外，由于电芯内部的极片与隔离膜之间粘接力小，甚至无粘接力，以致电池结构偏软。当电芯受力时，承受持续的挤压力，电芯无法迅速从受力点断裂分开，正负极受力拉伸出的毛刺接触使得电芯有短路的风险。
发明内容
有鉴于此，有必要提供一种电芯，所述电芯具有较高的抗跌落性能。
本申请还提供了一种具有该电芯的电池。
一种电芯，包括由第一极片、隔离膜和第二极片形成的卷绕单元，所述卷绕单元卷绕形成所述电芯，所述第一极片和/或所述第二极片的卷绕起始端设有空白区，所述电芯还包括：
第一粘接剂，设置于所述空白区和所述隔离膜之间，所述空白区为两侧未设置活性物质层的空白集流体。
一种电池，包括上述电芯、包装壳和第二粘接剂，所述包装壳包覆所述电芯，所述第二粘接剂设置于所述电芯和所述包装壳之间。
可选地，所述第一极片包括第一集流体及分别设置于所述第一集流体两 侧的第一活性物质层，所述第二极片包括第二集流体及分别设置于所述第二集流体两侧的第二活性物质层。
可选地，所述第一极片包括依次设置的第一空白区、第一单面区和第一双面区，所述第一空白区与所述隔离膜之间设置有所述第一粘接剂。
可选地，所述第一单面区包括朝向所述电芯的中心的第一表面，所述第一表面未设置所述第一活性物质层，其中，所述第一表面和所述隔离膜之间设置有所述第一粘接剂。
可选地，所述第一极片包括依次设置的第一单面区和第一双面区，所述第一单面区包括朝向所述电芯的中心的第一表面，所述第一表面未设置所述第一活性物质层，其中，所述第一表面和所述隔离膜之间设置有所述第一粘接剂。
可选地，所述第二极片包括依次设置的第二空白区、第二双面区、第二单面区和第三空白区，所述第二空白区与所述隔离膜之间设置有所述第一粘接剂。
可选地，所述第二单面区包括背对所述电芯的中心的第二表面，所述第二表面未设置所述第二活性物质层，其中，位于所述电芯最外圈部分的第二表面与包装壳之间以及第三空白区的外表面与包装壳之间设置有所述第二粘接剂。
可选地，所述第一极片包括依次设置的第一空白区、第三单面区和第三双面区，所述第三单面区包括朝向所述电芯的中心的第三表面，所述第三表面未设置所述第一活性物质层，所述第一空白区和所述隔离膜之间以及所述第三表面和所述隔离膜之间设置有所述第一粘接剂。
可选地，所述第二极片包括依次设置的第四双面区、第四单面区和第四空白区，所述第四单面区包括背对所述电芯的中心的第四表面，所述第四表面未设置所述第二活性物质层，所述第四单面区和所述第四空白区位于所述电芯的最外圈，所述第四空白区的外表面与包装壳之间以及所述第四表面与包装壳之间设置有所述第二粘接剂。
可选地，所述第一粘接剂为胶水或胶纸，其中，所述胶纸的断裂应力不大于5000N/m，断裂应变不大于200％。
综上所述，通过第一粘接剂的设置强化了电芯内部的极片与隔离膜之间的连接，从而大大提高所述电池的刚性，进而使得电池在承受机械冲击时不会出现漏液、起火等现象。另外，由于所述第一粘接剂的设置，使得电芯的内界面之间粘接牢固；如此，当电池因机械冲击而受力时，整个电池可迅速从受力点断裂分开，使得电芯不用承受持续的挤压力，以降低电芯短路的风险。
附图说明
图1为本申请一实施方式的电池的结构示意图。
图2为本申请另一实施方式的电池的结构示意图。
图3为图1所示电芯中卷绕单元的剖面示意图。
图4为图1所示第一极片的剖面示意图。
图5为图1所示第二极片的剖面示意图。
图6为本申请一实施方式的第一极片的剖面示意图。
图7为图2所示第一极片的剖面示意图。
图8为图2所示第二极片的剖面示意图。
图9为图1所示电池中间区域的结构示意图。
图10为图1所示电池的部分结构示意图。
图11为图2所示电池中间区域的结构示意图。
图12为图2所示电池的部分结构示意图。
图13为图1所示电池中无第二粘接剂的结构示意图。
图14为图2所示电池中无第二粘接剂的结构示意图。
图15为本申请中对比例1的电池的结构示意图。
图16为本申请中对比例2的电池的结构示意图。
主要元件符号说明
电池                            100
电芯                            10
卷绕单元                        11
第一极片                        111
第一空白区                      1111
第一单面区                      1112
第一双面区                      1113
第一表面                        1114
第三单面区                      1115
第三双面区                      1116
第三表面                        1117
隔离膜                          112
第二极片                        113
第二空白区                      1131
第二双面区                      1132
第二单面区                      1133
第三空白区                      1134
第二表面                        1135
第四双面区                      1136
第四单面区                      1137
第四空白区                      1138
第四表面                        1139
第一集流体                      114
第一活性物质层                  115
第二集流体                      116
第二活性物质层                  117
第一粘接剂                     12
包装壳                         20
第二粘接剂                     30
第一极耳                       40
第二极耳                       50
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。
下面结合附图，对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。
下述实施例中的空白区为两侧均为设置活性物质的空白集流体；单面区为集流体一面设置有活性物质，另一面未设置活性物质的区域；双面区为集流体两面均设置有活性物质的区域。
参图1，本申请实施方式提供了一种电池100。所述电池100包括电芯10。请一并参阅图3，所述电芯10包括由第一极片111、隔离膜112和第二极片113形成的卷绕单元11。所述卷绕单元11卷绕形成所述电芯10。所述隔离膜112位于所述第一极片111和所述第二极片113之间。其中，所述第一极片111的卷绕起始端设有第一空白区1111(参图4)或/和所述第二极片113的卷绕起始端设有第二空白区1131(参图5)。
进一步地，所述电芯10还包括第一粘接剂12。所述第一粘接剂12设置于所述第一空白区1111与所述隔离膜112之间或/和设置于所述第二空白区 1131和所述隔离膜112之间。其中，所述第一粘接剂12的设置解决了第一空白区1111与隔离膜112之间直接接触时或/和第二空白区1131和隔离膜112之间直接接触时，无粘接力的问题，从而增加了所述电芯10的刚性，进而提高了所述电池100的抗跌落性能。在本实施方式中，通过所述第一粘接剂12的设置，使得所述第一空白区1111和所述隔离膜112之间的粘接力大于2N/m，所述第二空白区1131和所述隔离膜112之间的粘接力大于2N/m。
进一步地，所述电池100还包括包装壳20和第二粘接剂30。所述包装壳20包覆所述电芯10。所述第二粘接剂30设置于所述电芯10和所述包装壳20之间。其中，所述第二粘接剂30的设置在增加所述电芯10和所述包装壳20之间粘接力的同时，还提高了所述电池100的刚性。如此，由于所述第二粘接剂30将所述电芯10和所述包装壳20牢固的连接在一起，即使所述电池100发生跌落或受到撞击，所述电芯10和所述包装壳20之间也不会发生相对位移，那么，包装壳20的头尾就不会受到电芯10的冲击，而出现被冲开或疲劳损伤等问题所导致的电池100漏液或包装壳20无法继续阻隔外界水汽的状况。在本实施方式中，通过所述第二粘接剂30的设置，使得所述电芯10与所述包装壳20之间的粘接力不小于10N/m。其中，在所述电芯10和所述包装壳20之间设置所述第二粘接剂30的连接方式会影响所述电池100的抗跌落性能。如此，需要控制所述第二粘接剂30的断裂应力不大于5000N/m，断裂应变不大于200％，以避免因为过强的断裂应力导致电池100在发生跌落或碰撞时出现极片断裂的情况。其中，断裂应力是指物体在受到某一方向的外力作用下所能承受的最大拉伸力。断裂应变是指物体在外力作用下的变形程度。
在本实施方式中，所述第一粘接剂12和所述第二粘接剂30可以为胶水或胶纸。其中，所述第一粘接剂12的断裂应力不大于5000N/m，断裂应变不大于200％。
进一步地，如图1所示，所述电池100还包括第一极耳40和第二极耳50。其中，所述第一极耳40设置于所述第一极片111上，所述第二极耳50 设置于所述第二极片113上。
参图4至图8，所述第一极片111包括第一集流体114及分别设置于所述第一集流体114两侧的第一活性物质层115。所述第二极片113包括第二集流体116及分别设置于所述第二集流体116两侧的第二活性物质层117。其中，所述第一空白区1111为所述第一集流体114的两侧均未设置有第一活性物质层115的区域，所述第二空白区1131为所述第二集流体116的两侧均未设置有第二活性物质层117的区域。
下面通过实施例及对比例对本申请进行具体说明。
实施例1
参图1，所述电池100包括电芯10、包装壳20和第二粘接剂30。所述包装壳20包覆所述电芯10。所述第二粘接剂30设置于所述电芯10和所述包装壳20之间。请一并参阅图3，所述电芯10包括由第一极片111、隔离膜112和第二极片113形成的卷绕单元11。所述卷绕单元11卷绕形成所述电芯10。
参图4，所述第一极片111包括依次设置的所述第一空白区1111、第一单面区1112和第一双面区1113。请一并参阅图9，所述第一单面区1112包括朝向所述电芯10的中心的第一表面1114。所述第一表面1114未设置第一活性物质层115。其中，所述第一表面1114为所述第一集流体114未设置第一活性物质层115的表面。
在实施例1中，参图1和图9，所述电芯10还包括第一粘接剂12。所述第一空白区1111与所述隔离膜112之间及所述第一表面1114和所述隔离膜112之间设置有所述第一粘接剂12。
参图5，所述第二极片113包括依次设置的所述第二空白区1131、第二双面区1132、第二单面区1133和第三空白区1134。参图9，所述第二空白区1131与所述隔离膜112之间设置有所述第一粘接剂12。参图10，所述第二单面区1133包括背对所述电芯10的中心的第二表面1135。所述第二表面1135未设置第二活性物质层117。其中，所述第二表面1135为所述第二集 流体116未设置第二活性物质层117的表面。位于所述电芯10最外圈部分的第二表面1135与包装壳20之间以及第三空白区1134的外表面与包装壳20之间设置有所述第二粘接剂30。
实施例2
实施例2与实施例1的区别在于，第一极片111的结构和第一粘接剂12设置的位置。
在实施例2中，参图6，所述第一极片111包括依次设置的第一单面区1112和第一双面区1113。其中，所述第一粘接剂12则设置于所述第一表面1114和所述隔离膜112之间。
实施例3
参图2，实施例3与实施例2的区别在于，第一极片111的结构、第二极片113的结构、第一粘接剂12设置的位置及第二粘接剂设置的位置。
在实施例3中，参图7，所述第一极片111包括依次设置的所述第一空白区1111、第三单面区1115和第三双面区1116。参图11，所述第三单面区1115包括朝向所述电芯10的中心的第三表面1117。所述第三表面1117未设置第一活性物质层115。其中，所述第三表面1117为所述第一集流体114未设置第一活性物质层115的表面。所述第一空白区1111和所述隔离膜112之间及所述第三表面1117和所述隔离膜112之间设置有所述第一粘接剂12。
参图8，所述第二极片113包括依次设置的第四双面区1136、第四单面区1137和第四空白区1138。参图12，所述第四单面区1137包括背对所述电芯10的中心的第四表面1139。所述第四表面1139未设置第二活性物质层117。其中，所述第四表面1139为所述第二集流体116未设置第二活性物质层117的表面。所述第四单面区1137和所述第四空白区1138位于所述电芯的最外圈。所述第四空白区1138的外表面与包装壳20之间以及所述第四表面1139与包装壳20之间设置有所述第二粘接剂30。
实施例4
参图13，实施例4和实施例1的区别在于，实施例4的电池100中无第二粘接剂30。
实施例5
参图14，实施例5和实施例3的区别在于，实施例5的电池100中无第二粘接剂30。
对比例1
参图15，对比例1和实施例4的区别在于，对比例1的电池100中无第一粘接剂12。
对比例2
参图16，对比例2和实施例5的区别在于，对比例2的电池100中无第一粘接剂12。
一实施方式中，实施例1、实施例3、实施例4、实施例5及对比例1-2中所涉及的电池100为方形电池。如此，对实施例1、实施例3、实施例4、实施例5及对比例1-2中所涉及的电池100进行6面四角跌落测试。测试高度为1.5m，共计十轮。其中，6面四角跌落为一轮。经测试后的电池，若不漏液，不发热，且电压降低小于30mV，则表示该电池通过跌落测试。参表1，为实施例1、实施例3、实施例4、实施例5及对比例1-2跌落测试的通过率对比表。
表1
  实施例1 实施例3 实施例4 实施例5 对比例1 对比例2
通过率 100％ 100％ 60％ 80％ 50％ 60％
比对表1可知，相较于对比例1-2，电池100中设置有第一粘接剂12的实施例4和实施例5的通过率提高了10％～20％。相较于实施例4-5，电池100中设置有第二粘接剂30的实施例1和实施例3的通过率提高了20％～40％。相较于对比例1-2，电池100中设置有第一粘接剂12和第二粘接剂30的实施例1和实施例3的通过率提高了50％左右。由此可知，所述第一粘接剂 12和所述第二粘接剂30的设置，大大提高了所述电池100的抗跌落性能，从而有效提升所述电池100的安全性能。
在其他实施方式中，所述电池100的形状不限于方形，还可以是柱状等规则形状或其他不规则形状。
综上所述，通过第一粘接剂12的设置强化了电芯10内部的极片与隔离膜112之间的连接，从而大大提高所述电池100的刚性，进而使得电池100在承受机械冲击时不会出现漏液、起火等现象。另外，由于所述第一粘接剂12的设置，使得电芯10的内界面之间粘接牢固；如此，当电池100因机械冲击而受力时，整个电池100可迅速从受力点断裂分开，使得电芯10不用承受持续的挤压力，以降低电芯10短路的风险。
以上实施例仅用以说明本申请的技术方案而非限制，尽管参照较佳实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或等同替换，而不脱离本申请技术方案的精神和实质。

Claims (11)

  1. 一种电芯，包括由第一极片、隔离膜和第二极片形成的卷绕单元，所述卷绕单元卷绕形成所述电芯，其特征在于，所述第一极片和/或所述第二极片的卷绕起始端设有空白区，所述电芯还包括：
    第一粘接剂，设置于所述空白区和所述隔离膜之间，所述空白区为两侧未设置活性物质层的空白集流体。
  2. 一种电池，包括如权利要求1所述的电芯，其特征在于，所述电池还包括包装壳和第二粘接剂，所述包装壳包覆所述电芯，所述第二粘接剂设置于所述电芯和所述包装壳之间。
  3. 如权利要求2所述的电池，其特征在于，所述第一极片包括第一集流体及分别设置于所述第一集流体两侧的第一活性物质层，所述第二极片包括第二集流体及分别设置于所述第二集流体两侧的第二活性物质层。
  4. 如权利要求3所述的电池，其特征在于，所述第一极片包括依次设置的第一空白区、第一单面区和第一双面区，所述第一空白区与所述隔离膜之间设置有所述第一粘接剂。
  5. 如权利要求4所述的电池，其特征在于，所述第一单面区包括朝向所述电芯的中心的第一表面，所述第一表面未设置所述第一活性物质层，其中，所述第一表面和所述隔离膜之间设置有所述第一粘接剂。
  6. 如权利要求3所述的电池，其特征在于，所述第一极片包括依次设置的第一单面区和第一双面区，所述第一单面区包括朝向所述电芯的中心的第一表面，所述第一表面未设置所述第一活性物质层，其中，所述第一表面和所述隔离膜之间设置有所述第一粘接剂。
  7. 如权利要求5或6所述的电池，其特征在于，所述第二极片包括依次设置的第二空白区、第二双面区、第二单面区和第三空白区，所述第二空白区与所述隔离膜之间设置有所述第一粘接剂。
  8. 如权利要求7所述的电池，其特征在于，所述第二单面区包括背对所述电芯的中心的第二表面，所述第二表面未设置所述第二活性物质层，其中， 位于所述电芯最外圈部分的第二表面与包装壳之间以及第三空白区的外表面与包装壳之间设置有所述第二粘接剂。
  9. 如权利要求3所述的电池，其特征在于，所述第一极片包括依次设置的第一空白区、第三单面区和第三双面区，所述第三单面区包括朝向所述电芯的中心的第三表面，所述第三表面未设置所述第一活性物质层，所述第一空白区和所述隔离膜之间以及所述第三表面和所述隔离膜之间设置有所述第一粘接剂。
  10. 如权利要求9所述的电池，其特征在于，所述第二极片包括依次设置的第四双面区、第四单面区和第四空白区，所述第四单面区包括背对所述电芯的中心的第四表面，所述第四表面未设置所述第二活性物质层，所述第四单面区和所述第四空白区位于所述电芯的最外圈，所述第四空白区的外表面与包装壳之间以及所述第四表面与包装壳之间设置有所述第二粘接剂。
  11. 如权利要求2所述的电池，其特征在于，所述第一粘接剂为胶水或胶纸，其中，所述胶纸的断裂应力不大于5000N/m，断裂应变不大于200％。
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