CN112615084A - 一种新能源汽车动力电池保温结构 - Google Patents

一种新能源汽车动力电池保温结构 Download PDF

Info

Publication number
CN112615084A
CN112615084A CN202011493899.7A CN202011493899A CN112615084A CN 112615084 A CN112615084 A CN 112615084A CN 202011493899 A CN202011493899 A CN 202011493899A CN 112615084 A CN112615084 A CN 112615084A
Authority
CN
China
Prior art keywords
battery
material layer
layer
new energy
power battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011493899.7A
Other languages
English (en)
Inventor
陈朋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dilu Technology Co Ltd
Original Assignee
Dilu Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dilu Technology Co Ltd filed Critical Dilu Technology Co Ltd
Priority to CN202011493899.7A priority Critical patent/CN112615084A/zh
Publication of CN112615084A publication Critical patent/CN112615084A/zh
Pending legal-status Critical Current

Links

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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

本发明提供了一种新能源汽车动力电池保温结构，包括：上保温层，设置在电池模组与所述上盖板之间；水冷机构，设置在所述电池模组的下方，位于所述电池模组与所述电池壳体之间；以及保温结构层，设置在所述电池壳体外，所述保温结构层包括保温材料层以及PP材料层，所述保温材料层设置在所述电池壳体外，所述PP材料层设置在所述保温材料层外。本发明的一种新能源汽车动力电池保温结构，与传统动力电池保温结构相比，使用保温结构层替代传统电力电池的空气保温层，降低了动力电池的热耗散，保温效果获得提升，提高了新能源汽车的节能效果。

Description

一种新能源汽车动力电池保温结构
技术领域
本发明涉及动力电池保温技术领域，具体涉及一种新能源汽车动力电池保温结构。
背景技术
新能源汽车普及以来，其动力电池的续航一直是用户关注的核心，从最初通过增加电量来优化续航，逐渐开始关注通过保温设计来减低外部冷热负荷的形式提升综合使用效率。目前的电池结构通常在模组顶部和侧面通过隔热棉来降低传热参数进行保温，在水冷通道的底部增加一个空心气腔，通过气腔内的空气层为降低水冷层与外部的热交换，为了降低其导热系数需要将气腔进行密封设计，一般采用焊接的方式，工序成本高、垂直空间占用大、增加整车重量，不利于电动化新能源车辆的优势发挥。
传统的电池保温结构采用空气保温层，然而空气保温层的焊接过程复杂，电池整体重量较重。
发明内容
为了解决上述问题，本发明提供一种新能源汽车动力电池保温结构，与传统动力电池保温结构相比，使用保温结构层替代传统电力电池的空气保温层，保温效果获得提升，降低了动力电池的热耗散，提高了新能源汽车的节能效果。
为了实现以上目的，本发明采取的一种技术方案是：
一种新能源汽车动力电池保温结构，包括：上保温层，设置在电池模组与所述上盖板之间；水冷机构，设置在所述电池模组的下方，位于所述电池模组与所述电池壳体之间；以及保温结构层，设置在所述电池壳体外，所述保温结构层包括保温材料层以及PP材料层，所述保温材料层设置在所述电池壳体外，所述PP材料层设置在所述保温材料层外。
进一步地，所述保温材料层为气凝胶。
进一步地，所述PP材料层通过粘合胶设置在所述保温材料层远离所述电池壳体的一面。
进一步地，所述保温结构层通过螺栓或卡扣设置在所述电池壳体外。
进一步地，所述保温材料层的厚度为5±0.1mm。
进一步地，所述PP材料层的厚度为2±0.1mm。
进一步地，所述水冷机构包括水冷板以及水道，所述水冷板设置在所述电池模组的下方，所述水道位于所述水冷板与所述电池壳体之间。
本发明的上述技术方案相比现有技术具有以下优点：
(1)本发明的一种新能源汽车动力电池保温结构，与传统动力电池保温结构相比，使用保温结构层替代传统电力电池的空气保温层，保温效果获得提升，降低了动力电池的热耗散，提高了新能源汽车的节能效果。
(2)本发明的一种新能源汽车动力电池保温结构，使用保温结构层替代空气保温层，解决了空气保温层焊接困难、焊接工艺复杂的技术问题，同时减少了一层金属层，由于保温结构层的重量明显低于金属材料，因此所述动力电池的重量减轻，提升了功率密度，减小了所述动力电池的高度，减少了制造成本。
(3)本发明的一种新能源汽车动力电池保温结构，保温结构层通过螺栓或卡扣设置在所述电池壳体外提高了动力电池的制造效率。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其有益效果显而易见。
图1所示为本发明一实施例的新能源汽车动力电池保温结构剖视图；
图2所示为本发明一实施例的保温结构层的剖视图。
图中附图标记：
1-上盖板板、2-上保温层、3-电池模组、4-水冷板、5-水道、6-电池壳体、7-保温结构层、71-保温材料层、72-粘合胶、73-PP材料层。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅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。
本实施例提供了一种新能源汽车动力电池保温结构，如图1所示，包括上保温层2、水冷机构以及保温结构层7，所述上保温层2设置在电池模组3与所述上盖板1之间，所述水冷机构，设置在所述电池模组3下方，位于所述电池模组3与所述电池壳体6之间，所述保温结构层7设置在所述电池壳体6外。
所述水冷机构包括水冷板4以及水道5，所述水冷板4设置在所述电池模组的下方，所述水道5位于所述水冷板4与所述电池壳体6之间。
如图2所示，所述保温结构层7包括保温材料层71以及PP材料层73，所述保温材料层71设置在所述电池壳体6外，所述PP材料层73设置在所述保温材料层71外。所述保温材料层71优选气凝胶。所述PP材料层73通过粘合胶72设置在所述保温材料层71远离所述电池壳体6的一面。所述保温结构层7通过螺栓或卡扣设置在所述电池壳体6外，使得所述保温结构层7与所述动力电池的连接更加的快捷。
所述保温材料层71的厚度为5±0.1mm，所述PP材料层73的厚度为2±0.1mm。
以动力电池总电量140度电，采取15S3P的大电池模组为例阐述改进的参数对比，其中大电池模组内部不具备水冷通道，其散热渠道通过水冷板与水道连接，电池底面为2200mm长，1400mm宽，电池壳体厚度3mm。实施例1采用保温结构层，其中气凝胶产品为5mm厚度。保温材料厚度7mm。对比实施例，去除保温结构层，在电池壳体与水道之间增设空气保温层，空气保温层方案空气保温层的厚度5mm，
两种动力电池的对比数据如下表1所示
表1.实施例1与对比例对比参数
Figure BDA0002841537570000031
由表1可以看出，采用本发明动力电池的整体高度变低，同时本发明制备工艺更加简单易于操作，本发明的保温结构的重量与对比例相比大大的降低，同时制备成本有所降低。
以25度为电芯保温控制目标，仿真动态和静态的电池底部热流失热量。全年平均温度见下表2，热流失计算公式为：P＝(S*ΔT*Rth)/(D)，其中P为热流失功率，Rth为导热材料传热系数，S为热交换的面积，ΔT为冷热交换温差，D为冷热面隔离材料厚度
在保温的设计中多为隔热层与支撑层(保护罩)堆叠而成，两种材料的耦合计算公式为：Rth*＝(D1+D2)*(Rth1*Rth2)/(D2*Rth1+D1*Rth2)，其中Rth*为等效传热系数，D1为材料1厚度，D2为材料2厚度，Rth1为材料1传热系数，Rth2为材料2传热系数。
表2.实施例1与对比例保温层人流失对比
温度 对比例热流失/W 实施例1热流失/w 差值/W
-20℃ 748 485 263
0℃ 415 269 146
15℃ 166 108 58
由表2可知，本发明的热流失去与现有技术对比例相比大大降低。
以10年为计算目标，根据静态热损失统计经济效益。
T＝10*365*24＝87600h，即10年共计87600小时
由公式E＝P*T，其中E为节能的电量，P为热流失的减少值，T为该功率的持续时间，获得E_Total＝∑P*T*Per，其中，Per为该耗散功率所占的比例，以单位电价为0.9元/kwh进行计算，如下表3所示：
表3.实施例1节能
温度 占比/％ 热流失差值/W 节能电量/kWh 节能费用/元
-20℃ 1 263 230 207
0℃ 5 146 639 575
15℃ 10 58 508 457
由表3可知，本发明由于保温特性带来的预估节能成本总计1239元。
以上所述仅为本发明的示例性实施例，并非因此限制本发明专利保护范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (7)

1.一种新能源汽车动力电池保温结构，其特征在于，包括：
上保温层(2)，设置在电池模组(3)与所述上盖板(1)之间；
水冷机构，设置在所述电池模组(3)下方，位于所述电池模组(3)与所述电池壳体(6)之间；以及
保温结构层(7)，设置在所述电池壳体(6)外，所述保温结构层(7)包括保温材料层(71)以及PP材料层(73)，所述保温材料层(71)设置在所述电池壳体(6)外，所述PP材料层(73)设置在所述保温材料层(71)外。
2.根据权利要求1所述的新能源汽车动力电池保温结构，其特征在于，所述保温材料层(71)为气凝胶。
3.根据权利要求1所述的新能源汽车动力电池保温结构，其特征在于，所述PP材料层(73)通过粘合胶(72)设置在所述保温材料层(71)远离所述电池壳体(6)的一面。
4.根据权利要求1所述的新能源汽车动力电池保温结构，其特征在于，所述保温结构层(7)通过螺栓或卡扣设置在所述电池壳体(6)外。
5.根据权利要求1所述的新能源汽车动力电池保温结构，其特征在于，所述保温材料层(71)的厚度为5±0.1mm。
6.根据权利要求1所述的新能源汽车动力电池保温结构，其特征在于，所述PP材料层(73)的厚度为2±0.1mm。
7.根据权利要求1所述的新能源汽车动力电池保温结构，其特征在于，所述水冷机构包括水冷板(4)以及水道(5)，所述水冷板(4)设置在所述电池模组的下方，所述水道(5)位于所述水冷板(4)与所述电池壳体(6)之间。
CN202011493899.7A 2020-12-17 2020-12-17 一种新能源汽车动力电池保温结构 Pending CN112615084A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011493899.7A CN112615084A (zh) 2020-12-17 2020-12-17 一种新能源汽车动力电池保温结构

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011493899.7A CN112615084A (zh) 2020-12-17 2020-12-17 一种新能源汽车动力电池保温结构

Publications (1)

Publication Number Publication Date
CN112615084A true CN112615084A (zh) 2021-04-06

Family

ID=75240006

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011493899.7A Pending CN112615084A (zh) 2020-12-17 2020-12-17 一种新能源汽车动力电池保温结构

Country Status (1)

Country Link
CN (1) CN112615084A (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190348725A1 (en) * 2016-11-29 2019-11-14 Samsung Sdi Co., Ltd. Wall structure of battery cell, battery sub-module, battery module, or a battery system
CN209675463U (zh) * 2019-06-04 2019-11-22 王贝尔 气凝胶隔热片
CN110649193A (zh) * 2019-09-04 2020-01-03 王建国 一种耐低温电池模组
CN211150655U (zh) * 2019-11-01 2020-07-31 河南爱彼爱和新材料有限公司 一种具有导热隔热性能的隔热垫
CN211530141U (zh) * 2019-12-05 2020-09-18 浙江合众新能源汽车有限公司 一种动力电池包保温装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190348725A1 (en) * 2016-11-29 2019-11-14 Samsung Sdi Co., Ltd. Wall structure of battery cell, battery sub-module, battery module, or a battery system
CN209675463U (zh) * 2019-06-04 2019-11-22 王贝尔 气凝胶隔热片
CN110649193A (zh) * 2019-09-04 2020-01-03 王建国 一种耐低温电池模组
CN211150655U (zh) * 2019-11-01 2020-07-31 河南爱彼爱和新材料有限公司 一种具有导热隔热性能的隔热垫
CN211530141U (zh) * 2019-12-05 2020-09-18 浙江合众新能源汽车有限公司 一种动力电池包保温装置

Similar Documents

Publication Publication Date Title
CN207800719U (zh) 电池模组
CN207542358U (zh) 液冷电池模组以及电动汽车
CN114094228A (zh) 一种基于相变材料复合均热板的动力电池热管理系统
CN111355004B (zh) 电池模组
CN207572501U (zh) 散热组件及电池模组
CN211789133U (zh) 电池模组、电池包及电动车
CN112864510A (zh) 一种软包电池包
CN112615084A (zh) 一种新能源汽车动力电池保温结构
CN113224415A (zh) 液冷板及电池包
CN202025829U (zh) 锂电子动力电池的散热结构
CN111540978A (zh) 一种填充相变材料的锂离子电池相框
EP4273996A1 (en) Battery cell and battery module comprising same
CN206471425U (zh) 底部导热的动力电池模块
CN115395164A (zh) 一种单体电池、电池组及电池包
CN214043779U (zh) 一种带有集成液冷板和石墨片的浸泡式液冷电池模组
CN209571523U (zh) 一种电池模组散热结构
CN208460921U (zh) 一种液冷板及锂电池模组
CN111540853A (zh) 一种保温电池包及电动汽车
CN220400865U (zh) 电池包及用电装置
CN218160562U (zh) 一种散热型锂电池
CN218385409U (zh) 电池及电池模组
CN220086180U (zh) 电池包组件和用电装置
CN220341303U (zh) 电池模组及电池包
CN219106300U (zh) 动力电池包和电动汽车
CN220652131U (zh) 一种散热装置及电池箱

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210406