WO2022205922A1 - Soft-pack lithium-ion battery having high energy density - Google Patents
Soft-pack lithium-ion battery having high energy density Download PDFInfo
- Publication number
- WO2022205922A1 WO2022205922A1 PCT/CN2021/129555 CN2021129555W WO2022205922A1 WO 2022205922 A1 WO2022205922 A1 WO 2022205922A1 CN 2021129555 W CN2021129555 W CN 2021129555W WO 2022205922 A1 WO2022205922 A1 WO 2022205922A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pole
- positive
- pit
- ion battery
- soft
- Prior art date
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000002985 plastic film Substances 0.000 abstract description 15
- 229920006255 plastic film Polymers 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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 high-energy-density soft-pack lithium-ion battery, in particular to a lithium-ion battery with a special-shaped pole group.
- the shell of the soft-pack lithium battery is made of aluminum-plastic film after being punched and stretched. Stamping and stretching utilizes the ductility of the aluminum-plastic film itself to make a pit and place the pole group. In order to prevent the aluminum-plastic film from being damaged or even broken during the stamping and stretching process, the edges of the punch are made with smooth chamfers.
- the positive and negative plates of the battery produced by the winding method are generally standard rectangles.
- the length of the pole group should be shorter than that of the aluminum-plastic pit. This results in that part of the space of the aluminum-plastic pit cannot be fully occupied by the active material of the electrode group. If this part of the wasted space can be fully utilized due to the interference between the pole group and the chamfered arc of the aluminum-plastic pit, the energy of the battery can be higher.
- the purpose of the present invention is to provide a high-energy-density soft-pack lithium-ion battery that can fully utilize the space wasted by avoiding the interference between the pole group and the chamfered arc of the aluminum-plastic pit.
- the present invention provides a high-energy density soft-packed lithium-ion battery, which adopts the following technical scheme: the positive and negative plates are provided with a gap, and the gap is located at the theoretical calculation fold line of the pole piece, the positive and negative plates are wound to form a pole group, and the There are positive and negative electrode gaps at the corners of the group.
- the notches may be rectangular, semi-elliptical or other shapes.
- the notches are located at the bottom end, the top end, or both the top and bottom ends of the pole pieces.
- the positive and negative electrodes are provided with gaps, and the gaps are located at the theoretically calculated fold line of the pole pieces.
- the positive and negative electrode pieces are wound to form a pole group, and the corners of the pole group have gaps in the positive and negative electrode pieces.
- the pole group there will be gaps in the material of the hard positive and negative electrode pieces at the corners of the pole group.
- Fig. 1 is the appearance schematic diagram of the pole group of the present invention
- Figure 2 is a schematic diagram of the aluminum plastic film
- Fig. 3 is the appearance schematic diagram of the pole piece of the present invention.
- FIG. 4 is a schematic diagram of the gap of the pole piece of the present invention.
- 1 pole group 1 pole group, 2 aluminum plastic film, 3 aluminum plastic film pit, 4 aluminum plastic film pit chamfer arc, 5 appearance of the pole piece of the present invention, 6 gap at the bottom end of the pole piece.
- the pole group 1 of the present invention is wrapped with an aluminum-plastic film 2, the surface of the aluminum-plastic film is provided with an aluminum-plastic film pit 3, and the bottom is provided with an aluminum-plastic film pit chamfering arc 4, as shown in Figure 3
- the positive and negative electrode pieces 5 are provided with a gap 6, and the gap is located at the theoretical calculation fold line of the pole piece.
- the positive and negative electrode pieces are wound to form a pole group.
- the notches can be rectangular, semi-elliptical, or other shapes.
- the width of the test pole piece is 1mm wider than the existing pole piece, and the positive and negative electrode active materials in these parts increase the capacity of the battery.
- the battery capacity made of special-shaped pole pieces has increased by 1.5% compared with the previous one.
- the existing rectangular diaphragm can still be used. After the diaphragm meets the aluminum-plastic shell at the chamfer, it will deform, which does not affect the entry of the pole group into the aluminum-plastic film pit.
- the total length of the pole piece is the cumulative sum of the length of each folded pole piece, so the calculation method of the length of each folded pole piece is the prior art, so the calculation of the fold line position of the pole piece is the prior art, and will not be repeated here. Repeat.
Abstract
Disclosed is a soft-pack lithium-ion battery having a high energy density. According to the soft-pack lithium-ion battery having a high energy density of the present invention, a positive pole piece and a negative pole piece are provided with notches, the notches are located at theoretically calculated folding lines of the pole pieces, and corners of a pole set formed by winding the positive and negative pole pieces are provided with the notches of the positive and negative pole pieces. With the pole set prepared by winding in such a way, the notches of hard positive and negative pole piece materials are generated at the corners of the pole set, so that when the pole set enters a pit, the problem of it not being possible for the pole set to enter an aluminum-plastic-film pit due to interference between the pole pieces and a chamfered circular-arc portion of the pit will not occur. Thus, the space of the chamfered portion of the pit can be fully used, thereby improving the capacity of the battery.
Description
本发明涉及一种高能量密度软包锂离子电池，特别涉及一种异形极组锂离子电池。The invention relates to a high-energy-density soft-pack lithium-ion battery, in particular to a lithium-ion battery with a special-shaped pole group.
软包锂电池的壳体是用铝塑膜经过冲压拉伸之后制备。冲压拉伸是利用了铝塑膜本身的延展性，制成凹坑后放置极组。为了防止在冲压拉伸过程中铝塑膜破损甚至破裂，冲头边缘都做成光滑的倒角。The shell of the soft-pack lithium battery is made of aluminum-plastic film after being punched and stretched. Stamping and stretching utilizes the ductility of the aluminum-plastic film itself to make a pit and place the pole group. In order to prevent the aluminum-plastic film from being damaged or even broken during the stamping and stretching process, the edges of the punch are made with smooth chamfers.
采用卷绕方式生产极组的电池，其正负极片一般都是标准的正长方形。为了使极组能够不与铝塑膜凹坑的倒角圆弧部分产生干涉，顺利进入到铝塑的凹坑，极组长度都要比铝塑凹坑的长度要短一些。这就导致了铝塑凹坑的部分空间不能被极组的活性材料充分占据。如果这部分因极组与铝塑凹坑倒角圆弧干涉而浪费空间能够充分利用的话，电池的能量可以做到更高。The positive and negative plates of the battery produced by the winding method are generally standard rectangles. In order to make the pole group not interfere with the chamfered arc part of the aluminum-plastic film pit and smoothly enter the aluminum-plastic pit, the length of the pole group should be shorter than that of the aluminum-plastic pit. This results in that part of the space of the aluminum-plastic pit cannot be fully occupied by the active material of the electrode group. If this part of the wasted space can be fully utilized due to the interference between the pole group and the chamfered arc of the aluminum-plastic pit, the energy of the battery can be higher.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种可以充分利用因避免极组与铝塑凹坑倒角圆弧干涉所浪费空间的高能量密度软包锂离子电池。The purpose of the present invention is to provide a high-energy-density soft-pack lithium-ion battery that can fully utilize the space wasted by avoiding the interference between the pole group and the chamfered arc of the aluminum-plastic pit.
本发明一种高能量密度软包锂离子电池，采用如下技术方案：正负极片设置有缺口，缺口位于极片的理论计算折线处，所述正负极片卷绕而成极组，极组角部有正负极片缺口。The present invention provides a high-energy density soft-packed lithium-ion battery, which adopts the following technical scheme: the positive and negative plates are provided with a gap, and the gap is located at the theoretical calculation fold line of the pole piece, the positive and negative plates are wound to form a pole group, and the There are positive and negative electrode gaps at the corners of the group.
所述缺口可以是长方形、半椭圆形或者其它形状。The notches may be rectangular, semi-elliptical or other shapes.
所述缺口位于极片底端、顶端或者同时位于顶端和底端。The notches are located at the bottom end, the top end, or both the top and bottom ends of the pole pieces.
本发明具有如下有益效果：The present invention has the following beneficial effects:
本发明“正负极片设置有缺口，缺口位于极片的理论计算折线处，所述正负极片卷绕而成极组，极组角部有正负极片缺口”这样卷绕制备的极组，在极组角部会产生硬质正负极片材料的缺口，在极组进入凹坑时不会发生极片与凹坑的倒角圆弧部分干涉而导致极组无法进入铝塑膜凹坑的问题。这样可以充分的利用凹坑倒角部分的空间，提升电池的容量。In the present invention, "the positive and negative electrodes are provided with gaps, and the gaps are located at the theoretically calculated fold line of the pole pieces. The positive and negative electrode pieces are wound to form a pole group, and the corners of the pole group have gaps in the positive and negative electrode pieces." In the pole group, there will be gaps in the material of the hard positive and negative electrode pieces at the corners of the pole group. When the pole group enters the pit, the interference between the pole piece and the chamfered arc part of the pit will not occur, so that the pole group cannot enter the aluminum plastic film. pit problem. In this way, the space of the chamfered part of the pit can be fully utilized to increase the capacity of the battery.
图1是本发明的极组外观示意图；Fig. 1 is the appearance schematic diagram of the pole group of the present invention;
图2是铝塑膜示意图；Figure 2 is a schematic diagram of the aluminum plastic film;
图3是本发明极片外观示意图；Fig. 3 is the appearance schematic diagram of the pole piece of the present invention;
图4是本发明极片缺口示意图。FIG. 4 is a schematic diagram of the gap of the pole piece of the present invention.
其中：1极组，2铝塑膜，3铝塑膜凹坑，4铝塑膜凹坑倒角圆弧，5本发明的极片外观，6位于极片底端的缺口。Among them: 1 pole group, 2 aluminum plastic film, 3 aluminum plastic film pit, 4 aluminum plastic film pit chamfer arc, 5 appearance of the pole piece of the present invention, 6 gap at the bottom end of the pole piece.
下面结合附图对本发明做进一步说明。The present invention will be further described below with reference to the accompanying drawings.
如图1-2所示，本发明极组1外包裹铝塑膜2，铝塑膜表面设置有铝塑膜凹坑3，底部设置有铝塑膜凹坑倒角圆弧4，如图3-4所示，正负极片5设置有缺口6，缺口位于极片的理论计算折线处，所述正负极片卷绕而成极组，极组角部有正负极片缺口。缺口可以是长方形、半椭圆形或者其它形状。As shown in Figures 1-2, the pole group 1 of the present invention is wrapped with an aluminum-plastic film 2, the surface of the aluminum-plastic film is provided with an aluminum-plastic film pit 3, and the bottom is provided with an aluminum-plastic film pit chamfering arc 4, as shown in Figure 3 As shown in -4, the positive and negative electrode pieces 5 are provided with a gap 6, and the gap is located at the theoretical calculation fold line of the pole piece. The positive and negative electrode pieces are wound to form a pole group. The notches can be rectangular, semi-elliptical, or other shapes.
下面结合具体实施例详述本发明：Describe the present invention in detail below in conjunction with specific embodiment:
实施例：在某软包锂电池进行对比试验，使用长方形缺口，缺口深度1mm。Example: A comparative test was performed on a soft-packed lithium battery, using a rectangular notch with a notch depth of 1mm.
所以试验极片宽度比现有极片会宽1mm，这些部分的正负极活性材料给电池增加了容量。经试验测试，使用异形极片制成的电池，电池容量比之前提升了1.5％。Therefore, the width of the test pole piece is 1mm wider than the existing pole piece, and the positive and negative electrode active materials in these parts increase the capacity of the battery. After experimental tests, the battery capacity made of special-shaped pole pieces has increased by 1.5% compared with the previous one.
需要说明的是：It should be noted:
(1)异形极片的裁切，传统的滚动刀片裁切是无法实现的，需要使用激光裁切机才能实现。(1) The cutting of special-shaped pole pieces cannot be achieved by traditional rolling blade cutting, and it needs to use a laser cutting machine to achieve it.
(2)由于隔膜质地柔软，仍然可以使用现有的长方形隔膜，倒角处隔膜与铝塑壳体相遇后发生变形，不影响极组进入铝塑膜凹坑。(2) Due to the soft texture of the diaphragm, the existing rectangular diaphragm can still be used. After the diaphragm meets the aluminum-plastic shell at the chamfer, it will deform, which does not affect the entry of the pole group into the aluminum-plastic film pit.
(3)极片总长度是每一折极片长度的累计总和，所以每一折极片的长度的计算方法是现有技术，所以极片折线位置的计算是现有技术，在此不再赘述。(3) The total length of the pole piece is the cumulative sum of the length of each folded pole piece, so the calculation method of the length of each folded pole piece is the prior art, so the calculation of the fold line position of the pole piece is the prior art, and will not be repeated here. Repeat.
以上所述仅是本发明的优选实施方式，应当指出的是，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be regarded as the protection scope of the present invention.
Claims (3)
- 一种高能量密度软包锂离子电池，其特征是，正负极片设置有缺口，缺口位于极片的理论计算折线处，所述正负极片卷绕而成的极组，极组角部有正负极片缺口。A high-energy-density soft-packed lithium-ion battery, characterized in that the positive and negative plates are provided with a gap, and the gap is located at the theoretical calculation fold line of the pole piece, and the pole group formed by winding the positive and negative plates, the pole group angle There are gaps in the positive and negative electrodes.
- 根据权利要求1所述的高能量密度软包锂离子电池，其特征是，缺口是长方形或半椭圆形。The high-energy-density soft-pack lithium-ion battery according to claim 1, wherein the notch is rectangular or semi-elliptical.
- 根据权利要求1所述的高能量密度软包锂离子电池，其特征是，所述缺口位于极片底端、顶端或者同时位于顶端和底端。The high-energy density soft-pack lithium-ion battery according to claim 1, wherein the notch is located at the bottom end, the top end, or both the top end and the bottom end of the pole piece.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110341608.0 | 2021-03-30 | ||
| CN202110341608.0A CN113054237A (en) | 2021-03-30 | 2021-03-30 | High-energy-density soft package lithium ion battery |
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| WO2022205922A1 true WO2022205922A1 (en) | 2022-10-06 |
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| CN113054237A (en) * | 2021-03-30 | 2021-06-29 | 天津力神电池股份有限公司 | High-energy-density soft package lithium ion battery |
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- 2021-03-30 CN CN202110341608.0A patent/CN113054237A/en active Pending
- 2021-11-09 WO PCT/CN2021/129555 patent/WO2022205922A1/en active Application Filing
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| CN102544577A (en) * | 2012-03-01 | 2012-07-04 | 宁德新能源科技有限公司 | Special-shaped lithium ion battery and manufacturing method therefor |
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