CN106785071A - Thermal compounding process of battery unit - Google Patents
Thermal compounding process of battery unit Download PDFInfo
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- CN106785071A CN106785071A CN201710104652.3A CN201710104652A CN106785071A CN 106785071 A CN106785071 A CN 106785071A CN 201710104652 A CN201710104652 A CN 201710104652A CN 106785071 A CN106785071 A CN 106785071A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000013329 compounding Methods 0.000 title abstract description 18
- 238000007731 hot pressing Methods 0.000 claims description 40
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 13
- 239000002033 PVDF binder Substances 0.000 claims description 11
- 239000012528 membrane Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims 11
- 238000002360 preparation method Methods 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract description 15
- 238000003475 lamination Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
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- 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
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- 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
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Abstract
本发明提供一种电池单元的热复合工艺，涉及电池技术领域。本发明电池单元的热复合工艺包括：准备四层单元层；将第一隔膜、第一电极、第二隔膜、第二电极依次至下而上层层堆叠；将堆叠好的四层单元层送入热压机中热压，形成热压单元即可。本发明叠片效率高，工艺简单，生产效率高，制作的电池安全性能高，循环性能好。
The invention provides a thermal compounding process of a battery unit, which relates to the technical field of batteries. The thermal compounding process of the battery unit of the present invention includes: preparing four-layer unit layers; stacking the first diaphragm, the first electrode, the second diaphragm, and the second electrode from bottom to top; sending the stacked four-layer unit layer into Heat pressing in a heat press to form a heat pressing unit. The invention has the advantages of high lamination efficiency, simple process, high production efficiency, high safety performance and good cycle performance of the manufactured battery.
Description
技术领域technical field
本发明涉及电池技术领域，涉及一种电池单元的热复合工艺。The invention relates to the technical field of batteries, and relates to a thermal compounding process of battery cells.
背景技术Background technique
随着世界石油能源的日渐枯竭，新能源的需求越来越迫切，锂电池具有有高能量密度和电压、较长的循环时间，并已商业化且得到广泛使用。As the world's petroleum energy is depleted day by day, the demand for new energy is becoming more and more urgent. Lithium batteries have high energy density and voltage, long cycle time, and have been commercialized and widely used.
目前高效率的生产锂电池还是以卷绕为主，但是相比同等条件下的叠片电池，卷绕有内阻较高、容量密度较低、能量密度低等一些影响电池容量的缺点，但就现有的叠片技术和工艺，叠片工序是一张正极极片和一张负极片交替放置在隔膜上，重复往返的动作导致叠片工艺复杂，生产效率低下，因此，消除叠片电池在叠片过程中单片叠加工艺短板至关重要。At present, high-efficiency production of lithium batteries is still mainly based on winding, but compared with laminated batteries under the same conditions, winding has some shortcomings that affect battery capacity, such as higher internal resistance, lower capacity density, and low energy density, but As far as the existing lamination technology and process are concerned, the lamination process is to alternately place a positive pole piece and a negative pole piece on the separator. Repeated back and forth actions lead to a complicated lamination process and low production efficiency. Therefore, eliminating the need for laminated battery In the lamination process, the short board of the monolithic superposition process is very important.
发明内容Contents of the invention
针对现有技术不足，本发明提供一种电池单元的热复合工艺，解决了现有技术中叠片技术和工艺复杂，生产效率低下的技术问题。Aiming at the deficiencies of the prior art, the present invention provides a thermal compounding process of the battery unit, which solves the technical problems of the prior art that the stacking technology and process are complicated and the production efficiency is low.
为实现以上目的，本发明通过以下技术方案予以实现：To achieve the above object, the present invention is achieved through the following technical solutions:
一种电池单元的热复合工艺，包括以下步骤：A thermal compounding process for battery cells, comprising the following steps:
S1、准备四层单元层，分别为第一隔膜、第一电极、第二隔膜、第二电极；S1. Prepare four unit layers, which are respectively the first separator, the first electrode, the second separator, and the second electrode;
S2、将第一隔膜、第一电极、第二隔膜、第二电极依次至下而上层层堆叠；S2, stacking the first diaphragm, the first electrode, the second diaphragm, and the second electrode sequentially from bottom to top;
S3、将步骤S2堆叠好的四层单元层送入热压机中，在热压温度为65-110℃、热压压力为500-1000kPa的条件下热压3-8s，形成热压单元即可。S3. Send the four-layer unit layer stacked in step S2 into a hot press machine, and hot press for 3-8 seconds under the conditions of a hot pressing temperature of 65-110°C and a hot pressing pressure of 500-1000kPa to form a hot pressing unit that is Can.
优选的，所述第一隔膜、第二隔膜为相同的隔膜，均为水系PVDF隔膜或油系PVDF隔膜。Preferably, the first diaphragm and the second diaphragm are the same diaphragm, both of which are water-based PVDF diaphragms or oil-based PVDF diaphragms.
优选的，所述第一电极和第二电极为极性相反的电极。Preferably, the first electrode and the second electrode are electrodes with opposite polarities.
优选的，当所述第一隔膜、第二隔膜均为水系PVDF膜时，所述热压机中热压温度为65-85℃、热压压力为800-1000kPa、热压时间为5-8s。Preferably, when the first diaphragm and the second diaphragm are both water-based PVDF membranes, the hot pressing temperature in the hot press is 65-85°C, the hot pressing pressure is 800-1000kPa, and the hot pressing time is 5-8s .
优选的，当所述第一隔膜、第二隔膜均为油系PVDF膜时，所述热压机中热压温度为85-110℃、热压压力为500-1000kPa、热压时间为3-8s。Preferably, when both the first diaphragm and the second diaphragm are oil-based PVDF membranes, the hot pressing temperature in the hot press is 85-110°C, the hot pressing pressure is 500-1000kPa, and the hot pressing time is 3- 8s.
优选的，所述热压机具有加压面，且形状与四层单元层表面形状相适应。Preferably, the heat press has a pressing surface, and its shape is adapted to the shape of the surface of the four-layer unit layer.
所述热压单元良好的判断标准如下：①四层单元层结构之间互相粘结，热压整体平整，无翘边、褶边、褶皱、开口，且具有一定的硬度；The criteria for judging the goodness of the hot-pressing unit are as follows: ① The four-layer unit layer structure is bonded to each other, the hot-pressing unit is flat as a whole, free of warped edges, frills, folds, and openings, and has a certain hardness;
②在吸盘类抓取工具吸起后以动作路径提起30mm，直线行走200mm，放下30mm往复循环5-10次，四层单元层结构之间不出现脱落分离为合格。② After the suction cup grabbing tool is picked up, lift it up 30mm with the action path, walk 200mm in a straight line, and put it down 30mm for 5-10 times, and it is qualified if there is no falling off and separation between the four-layer unit layer structure.
本发明提供一种电池单元的热复合工艺，与现有技术相比优点在于：The invention provides a thermal compounding process of a battery unit, which has the advantages compared with the prior art in that:
本发明电池单元的热复合工艺是将叠片单元热复合后再用机械手进行叠加的方式来改进现有工艺方式，提高叠片效率，工艺简单，生产效率高，避免了传统叠片工艺所需单一极片较多，且单片极片毛刺过多，本发明电池单元的热复合工艺，制作的电池安全性能高，电池的平衡性和稳定性增加；The thermal compounding process of the battery unit of the present invention is to improve the existing process by thermally compounding the laminated units and then superimposing them with a manipulator, to improve the lamination efficiency, the process is simple, the production efficiency is high, and the traditional lamination process is avoided. There are many single pole pieces, and there are too many burrs on a single pole piece. The thermal compounding process of the battery unit of the present invention has high safety performance of the battery, and the balance and stability of the battery are increased;
本发明电池单元的热复合工艺，单元层结构之间互相粘结，热压整体平整，减少了极片的毛刺，提高了电池的安全性能和循环性能。The heat compounding process of the battery unit of the present invention, the unit layer structures are bonded to each other, and the hot pressing is overall flat, reducing the burrs of the pole piece, and improving the safety performance and cycle performance of the battery.
附图说明Description of drawings
图1为本发明电池单元的单元层结构示意图；Fig. 1 is a schematic diagram of the unit layer structure of the battery unit of the present invention;
图2为本发明电池单元进行热压时的结构示意图。Fig. 2 is a schematic structural view of the battery unit of the present invention when it is subjected to hot pressing.
具体实施方式detailed description
为使本发明实施例的目的、技术方案和优点更加清楚，下面结合实施例对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, and Not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
实施例中热压单元良好的判断标准如下：①四层单元层结构之间互相粘结，热压整体平整，无翘边、褶边、褶皱、开口，且具有一定的硬度；The criteria for judging the goodness of the hot-pressing unit in the embodiment are as follows: ① The four-layer unit layer structure is bonded to each other, the hot-pressing unit is flat as a whole, without warping, frills, folds, or openings, and has a certain hardness;
②在吸盘类抓取工具吸起后以动作路径提起30mm，直线行走200mm，放下30mm往复循环5-10次，四层单元层结构之间不出现脱落分离为合格。② After the suction cup grabbing tool is picked up, lift it up 30mm with the action path, walk 200mm in a straight line, and put it down 30mm for 5-10 times. If there is no falling off and separation between the four-layer unit layer structure, it is qualified.
实施例1:Example 1:
一种电池单元的热复合工艺，包括以下步骤：A thermal compounding process for battery cells, comprising the following steps:
S1、准备四层单元层，分别为第一隔膜1、第一电极2、第二隔膜3、第二电极4；S1. Prepare four unit layers, which are respectively the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4;
S2、将第一隔膜1、第一电极2、第二隔膜3、第二电极4依次至下而上层层堆叠；S2, stacking the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4 sequentially from bottom to top;
S3、将步骤S2堆叠好的四层单元层送入热压机5中，在热压温度为65℃、热压压力为1000kPa的条件下热压8s，形成热压单元即可。S3. Send the four-layer unit layer stacked in step S2 into the hot press machine 5, and hot press for 8 seconds under the conditions of a hot pressing temperature of 65° C. and a hot pressing pressure of 1000 kPa to form a hot pressing unit.
其中，第一隔膜1、第二隔膜3的表面均涂敷具有粘结力的涂敷物质，且第一隔膜1和第二隔膜3均为水系PVDF膜，热压机具有加压面，且形状与四层单元层表面形状相适应，第一电极2为正极，第二电极4为负极。Wherein, the surfaces of the first diaphragm 1 and the second diaphragm 3 are all coated with an adhesive coating substance, and both the first diaphragm 1 and the second diaphragm 3 are water-based PVDF membranes, and the hot press has a pressing surface, and The shape is adapted to the surface shape of the four-layer unit layer, the first electrode 2 is a positive electrode, and the second electrode 4 is a negative electrode.
实施例2:Example 2:
一种电池单元的热复合工艺，包括以下步骤：A thermal compounding process for battery cells, comprising the following steps:
S1、准备四层单元层，分别为第一隔膜1、第一电极2、第二隔膜3、第二电极4；S1. Prepare four unit layers, which are respectively the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4;
S2、将第一隔膜1、第一电极2、第二隔膜3、第二电极4依次至下而上层层堆叠；S2, stacking the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4 sequentially from bottom to top;
S3、将步骤S2堆叠好的四层单元层送入热压机5中，在热压温度为85℃、热压压力为500kPa的条件下热压3s，形成热压单元即可。S3. Send the four-layer unit layer stacked in step S2 into the hot press machine 5, and hot press for 3 seconds under the conditions of hot pressing temperature of 85° C. and hot pressing pressure of 500 kPa to form a hot pressing unit.
其中，第一隔膜1、第二隔膜3的表面均涂敷具有粘结力的涂敷物质，且第一隔膜和第二隔膜均为油系PVDF膜，热压机具有加压面，且形状与四层单元层表面形状相适应，第一电极2为负极，第二电极4为正极。Among them, the surfaces of the first diaphragm 1 and the second diaphragm 3 are coated with a coating substance with cohesive force, and the first diaphragm and the second diaphragm are both oil-based PVDF films, and the hot press has a pressing surface, and the shape Compatible with the surface shape of the four-layer unit layer, the first electrode 2 is a negative electrode, and the second electrode 4 is a positive electrode.
实施例3:Embodiment 3:
一种电池单元的热复合工艺，包括以下步骤：A thermal compounding process for battery cells, comprising the following steps:
S1、准备四层单元层，分别为第一隔膜1、第一电极2、第二隔膜3、第二电极4；S1. Prepare four unit layers, which are respectively the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4;
S2、将第一隔膜1、第一电极2、第二隔膜3、第二电极4依次至下而上层层堆叠；S2, stacking the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4 sequentially from bottom to top;
S3、将步骤S2堆叠好的四层单元层送入热压机5中，在热压温度为85℃、热压压力为800kPa的条件下热压5s，形成热压单元即可。S3. Send the four-layer unit layer stacked in step S2 into the hot press machine 5, and heat press for 5 seconds under the conditions of a hot pressing temperature of 85° C. and a hot pressing pressure of 800 kPa to form a hot pressing unit.
其中，第一隔膜1、第二隔膜3的表面均涂敷具有粘结力的涂敷物质，且第一隔膜1和第二隔膜3均为水系PVDF膜，热压机具有加压面，且形状与四层单元层表面形状相适应，第一电极2为正极，第二电极4为负极。Wherein, the surfaces of the first diaphragm 1 and the second diaphragm 3 are all coated with an adhesive coating substance, and both the first diaphragm 1 and the second diaphragm 3 are water-based PVDF membranes, and the hot press has a pressing surface, and The shape is adapted to the surface shape of the four-layer unit layer, the first electrode 2 is a positive electrode, and the second electrode 4 is a negative electrode.
实施例4:Embodiment 4:
一种电池单元的热复合工艺，包括以下步骤：A thermal compounding process for battery cells, comprising the following steps:
S1、准备四层单元层，分别为第一隔膜1、第一电极2、第二隔膜3、第二电极4；S1. Prepare four unit layers, which are respectively the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4;
S2、将第一隔膜1、第一电极2、第二隔膜3、第二电极4依次至下而上层层堆叠；S2, stacking the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4 sequentially from bottom to top;
S3、将步骤S2堆叠好的四层单元层送入热压机5中，在热压温度为110℃、热压压力为1000kPa的条件下热压8s，形成热压单元即可。S3. Send the four-layer unit layer stacked in step S2 into the hot press machine 5, and hot press for 8 seconds under the conditions of a hot pressing temperature of 110° C. and a hot pressing pressure of 1000 kPa to form a hot pressing unit.
其中，第一隔膜1、第二隔膜3的表面均涂敷具有粘结力的涂敷物质，且第一隔膜1和第二隔膜3均为油系PVDF膜，热压机具有加压面，且形状与四层单元层表面形状相适应，第一电极2为负极，第二电极4为正极。Wherein, the surfaces of the first diaphragm 1 and the second diaphragm 3 are all coated with an adhesive coating substance, and both the first diaphragm 1 and the second diaphragm 3 are oil-based PVDF films, and the hot press has a pressing surface, And the shape is adapted to the surface shape of the four-layer unit layer, the first electrode 2 is a negative electrode, and the second electrode 4 is a positive electrode.
实施例5:Embodiment 5:
一种电池单元的热复合工艺，包括以下步骤：A thermal compounding process for battery cells, comprising the following steps:
S1、准备四层单元层，分别为第一隔膜1、第一电极2、第二隔膜3、第二电极4；S1. Prepare four unit layers, which are respectively the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4;
S2、将第一隔膜1、第一电极2、第二隔膜3、第二电极4依次至下而上层层堆叠，且保证各单元最大面中心对称；S2. Stack the first diaphragm 1, the first electrode 2, the second diaphragm 3, and the second electrode 4 sequentially from bottom to top, and ensure that the center of the largest surface of each unit is symmetrical;
S3、将步骤S2堆叠好的四层单元层送入热压机5中，在热压温度为110℃、热压压力为1000kPa的条件下热压8s，形成热压单元即可。热平压过程中，平压机5的上压板51从上测对四层单元最上测进行热压，且上压板51的加压面与四层单元表面形状相对应。S3. Send the four-layer unit layer stacked in step S2 into the hot press machine 5, and hot press for 8 seconds under the conditions of a hot pressing temperature of 110° C. and a hot pressing pressure of 1000 kPa to form a hot pressing unit. During the hot flat pressing process, the upper pressing plate 51 of the flat pressing machine 5 performs hot pressing on the uppermost side of the four-layer unit from the upper side, and the pressing surface of the upper pressing plate 51 corresponds to the surface shape of the four-layer unit.
其中，第一隔膜1、第二隔膜3的表面均涂敷具有粘结力的涂敷物质，且第一隔膜1和第二隔膜3均为油系PVDF膜，热压机具有加压面，且形状与四层单元层表面形状相适应，第一电极2为负极，第二电极4为正极。Wherein, the surfaces of the first diaphragm 1 and the second diaphragm 3 are all coated with an adhesive coating substance, and both the first diaphragm 1 and the second diaphragm 3 are oil-based PVDF films, and the hot press has a pressing surface, And the shape is adapted to the surface shape of the four-layer unit layer, the first electrode 2 is a negative electrode, and the second electrode 4 is a positive electrode.
在热压后的四层单元经由视觉判断结构之间是否相互粘结，热压整体是否平整，是否具有一定硬度，是否有翘边、褶边、褶皱、开口，在吸盘类抓取工具吸起后以动作路径为提起30mm，直线行走200mm，放下30mm往复循环5-10次，4层结构之间是否出现脱落分离来判断热压效果是否良好。After the hot-pressed four-layer unit is visually judged whether the structures are bonded to each other, whether the hot-pressed whole is flat, whether it has a certain hardness, whether there are warped edges, frills, folds, and openings, it is sucked up by the suction cup grabbing tool. Afterwards, the action path is to lift 30mm, walk 200mm in a straight line, put down 30mm and reciprocate 5-10 times, and whether there is separation between the 4-layer structure to judge whether the heat pressing effect is good.
综上所述，本发明电池单元的热复合工艺是将叠片单元热复合后再用机械手进行叠加的方式来改进现有工艺方式，提高叠片效率，工艺简单，生产效率高，避免了传统叠片工艺所需单一极片较多，且单片极片毛刺过多，本发明电池单元的热复合工艺，制作的电池安全性能高，电池的平衡性和稳定性增加；单元层结构之间互相粘结，热压整体平整，减少了极片的毛刺，提高了电池的安全性能和循环性能。In summary, the thermal compounding process of the battery unit of the present invention is to improve the existing process by thermally compounding the laminated units and then stacking them with a manipulator to improve the stacking efficiency. The process is simple and the production efficiency is high, avoiding the traditional The lamination process requires many single pole pieces, and there are too many burrs on the single pole piece. The thermal composite process of the battery unit of the present invention has high safety performance of the battery, and the balance and stability of the battery are increased; Bonding to each other, heat pressing is overall flat, reducing the burrs of the pole pieces, and improving the safety performance and cycle performance of the battery.
以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
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