CN115763986B - Quick baking method for battery - Google Patents
Quick baking method for battery Download PDFInfo
- Publication number
- CN115763986B CN115763986B CN202211332746.3A CN202211332746A CN115763986B CN 115763986 B CN115763986 B CN 115763986B CN 202211332746 A CN202211332746 A CN 202211332746A CN 115763986 B CN115763986 B CN 115763986B
- Authority
- CN
- China
- Prior art keywords
- baking
- nitrogen
- baking method
- water
- preheating
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 62
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 31
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 18
- 239000012159 carrier gas Substances 0.000 claims abstract description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 8
- 229910052786 argon Inorganic materials 0.000 claims abstract description 7
- 239000001307 helium Substances 0.000 claims abstract description 7
- 229910052734 helium Inorganic materials 0.000 claims abstract description 7
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000004321 preservation Methods 0.000 claims description 12
- 230000003213 activating effect Effects 0.000 claims 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 24
- 239000000126 substance Substances 0.000 abstract description 8
- 238000009835 boiling Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000001257 hydrogen Substances 0.000 abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 229910001415 sodium ion Inorganic materials 0.000 description 7
- 230000004913 activation Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
本发明提供了一种电池的快速烘烤方法,包括以下步骤:A)将电芯置于烘烤设备中,抽真空后通入活化气体和载气,进行预热;所述活化气体包括氨气、二氧化碳和甲醛中的一种或几种;所述载气为氮气、氩气和氦气中的一种或几种;所述活化气体的体积分数为0.1~5%;B)对预热后的电芯进行保温保压;C)重复步骤A)和B)至少一次;D)向烘烤设备中充入氮气至常压,进行氮气冷却循环,完成烘烤。本方法通过化学方法改变水分子的存在形态,通过在烘烤过程任意时间通入氨气,氨气分子与结合水和或非结合水通过氢键或化学键结合,氨气分子和水结合后可以显著降低混合物的沸点,使得在消耗更低能量下实现水分的高效去除。
The present invention provides a rapid baking method for a battery, comprising the following steps: A) placing a battery cell in a baking device, introducing an activated gas and a carrier gas after vacuuming for preheating; the activated gas includes one or more of ammonia, carbon dioxide and formaldehyde; the carrier gas is one or more of nitrogen, argon and helium; the volume fraction of the activated gas is 0.1-5%; B) keeping the preheated battery cell warm and pressurized; C) repeating steps A) and B) at least once; D) filling the baking device with nitrogen to normal pressure, performing a nitrogen cooling cycle, and completing the baking. The method changes the existing form of water molecules by a chemical method, and by introducing ammonia at any time during the baking process, the ammonia molecules are combined with bound water and/or unbound water through hydrogen bonds or chemical bonds, and the ammonia molecules can significantly reduce the boiling point of the mixture after combining with water, so that the efficient removal of water can be achieved with lower energy consumption.
Description
技术领域Technical Field
本发明属于电池技术领域,尤其涉及一种电池的快速烘烤方法。The invention belongs to the technical field of batteries, and in particular relates to a rapid baking method for batteries.
背景技术Background Art
石化能源逐渐枯竭和温室效应的日益严重促使研究者们不断探索可持续和清洁能源。自1991年sony首次商业化锂离子电池后,锂离子电池已在3C类数码产品和动力电池中得到极大应用。由于锂离子电池相对传统铅酸蓄电池在循环寿命、体积能量密度和质量能量密度都更具有优势,近20年来众多技术人员都在致力于锂离子电池的商业化。由于锂元素存在供应短板,研究者把钠离子电池作为锂离子电池补充的重要方向,2021年宁德时代新能源科技股份有限公司首发钠离子电池,拉开了钠离子电池产业化的序章。The gradual depletion of fossil energy and the increasingly serious greenhouse effect have prompted researchers to continuously explore sustainable and clean energy. Since Sony first commercialized lithium-ion batteries in 1991, lithium-ion batteries have been widely used in 3C digital products and power batteries. Since lithium-ion batteries have advantages over traditional lead-acid batteries in cycle life, volume energy density, and mass energy density, many technicians have been committed to the commercialization of lithium-ion batteries in the past 20 years. Due to the supply shortage of lithium elements, researchers regard sodium-ion batteries as an important direction to supplement lithium-ion batteries. In 2021, Contemporary Amperex Technology Co., Ltd. launched its first sodium-ion battery, which opened the prelude to the industrialization of sodium-ion batteries.
在这些电池制造工艺过程中,为保证电池的产品质量和使用安全性能,烘烤工序是至关重要的一步。电池的电芯生产工艺过程中很多步骤都需要烘烤,例如极片烘烤,电芯烘烤,正极活性物质、导电剂、粘结剂烘烤等。其中最为关键的是注液前的真空烘烤,一般水分要求小于300ppm。In the battery manufacturing process, baking is a crucial step to ensure the product quality and safety of the battery. Many steps in the battery cell production process require baking, such as pole piece baking, cell baking, positive electrode active material, conductive agent, binder baking, etc. The most critical one is the vacuum baking before liquid injection, and the moisture content is generally required to be less than 300ppm.
为了达到快速烘烤而且水分值达标,目前行业普遍采取高真空下加热至80-120℃烘烤,加热方式有热辐射、热传导和热对流,通过对烘烤设备和工艺的优化,烘烤效率可以做到每批次4~7小时。如专利CN112864463B采用梯度抽真空方式提高了烘烤效率。In order to achieve fast baking and meet the moisture content standard, the industry currently generally adopts high vacuum heating to 80-120℃ baking. The heating methods include heat radiation, heat conduction and heat convection. Through the optimization of baking equipment and processes, the baking efficiency can be achieved 4 to 7 hours per batch. For example, patent CN112864463B uses gradient vacuuming to improve baking efficiency.
锂离子电池和钠离子电池正负极极片是典型的多孔电极,极片孔隙率在20%-40%之间,孔隙迂曲度较高,活性物质材料属于微纳米材料,具有大比表面积和易吸水的特点。现有的工艺方法和设备都是围绕着如何快速加热同时降低压强来提高效率,这类方法只能在一定程度上加速非结合水的烘烤速率,对于结合水并没有效果。由于烘烤通常是在含有隔膜状态下进行的,因此无法通过提高温度来实现结合水的去除。对于一些吸水性较强的材料水分烘烤至700ppm时,即使延迟烘烤时间也无法进一步降低水含量。The positive and negative electrodes of lithium-ion batteries and sodium-ion batteries are typical porous electrodes with a porosity of 20%-40% and a high pore tortuosity. The active material is a micro-nano material with a large specific surface area and easy water absorption. Existing process methods and equipment are all centered around how to quickly heat and reduce pressure to improve efficiency. Such methods can only accelerate the baking rate of unbound water to a certain extent, but have no effect on bound water. Since baking is usually carried out in the presence of a diaphragm, it is impossible to remove bound water by increasing the temperature. For some materials with strong water absorption, when the moisture content is baked to 700ppm, even if the baking time is delayed, the water content cannot be further reduced.
发明内容Summary of the invention
本发明的目的在于提供一种电池的快速烘烤方法,本发明中的快速烘烤方法能够在消耗更低能量下实现水分的高效去除。The object of the present invention is to provide a rapid baking method for a battery. The rapid baking method of the present invention can achieve efficient removal of moisture with lower energy consumption.
本发明提供一种电池的快速烘烤方法,在烘烤过程中通入活化气体和载气,所述活化气体包括氨气、二氧化碳和甲醛中的一种或几种;所述载气为氮气、氩气和氦气中的一种或几种;所述活化气体的体积分数为0.1~5%。The invention provides a rapid baking method for a battery. During the baking process, an activated gas and a carrier gas are introduced. The activated gas comprises one or more of ammonia, carbon dioxide and formaldehyde; the carrier gas is one or more of nitrogen, argon and helium; and the volume fraction of the activated gas is 0.1-5%.
优选的,所述快速烘烤方法包括以下步骤:Preferably, the rapid baking method comprises the following steps:
A)将电芯置于烘烤设备中,抽真空后通入活化气体和载气,进行预热;A) placing the battery cell in a baking device, evacuating the battery cell, introducing an activated gas and a carrier gas for preheating;
B)对预热后的电芯进行抽真空保温保压;B) vacuuming and heat-insulating the preheated battery cells;
C)重复步骤A)和B)至少一次;C) repeating steps A) and B) at least once;
D)向烘烤设备中充入氮气至常压,进行氮气冷却循环,完成烘烤。D) Fill the baking equipment with nitrogen to normal pressure, perform nitrogen cooling cycle, and complete the baking.
优选的,所述预热时的绝对气压为30000~99000Pa。Preferably, the absolute gas pressure during preheating is 30000-99000 Pa.
优选的,所述预热的温度为80~115℃。Preferably, the preheating temperature is 80-115°C.
优选的,预热的总时间为10~120min。Preferably, the total preheating time is 10 to 120 minutes.
优选的,所述保温保压的真空度为10~100pa。Preferably, the vacuum degree of the heat preservation and pressure preservation is 10-100 Pa.
优选的,所述保温保压的温度为80~115℃。Preferably, the temperature of the heat preservation and pressure preservation is 80-115°C.
优选的,所述保温保压的时间为10~120min。Preferably, the heat preservation and pressure preservation time is 10 to 120 minutes.
优选的,进行至少两次所述氮气冷却循环。Preferably, the nitrogen cooling cycle is performed at least twice.
优选的,每次氮气冷却循环中,先保持常压0.1~10min,然后抽真空在真空度为10~200Pa下保持0.1~10min。Preferably, in each nitrogen cooling cycle, the normal pressure is first maintained for 0.1 to 10 min, and then the vacuum is evacuated and maintained at a vacuum degree of 10 to 200 Pa for 0.1 to 10 min.
本发明提供了一种电池的快速烘烤方法,包括以下步骤:A)将电芯置于烘烤设备中,抽真空后通入活化气体和载气,进行预热;所述活化气体包括氨气、二氧化碳和甲醛中的一种或几种;所述载气为氮气、氩气和氦气中的一种或几种;所述活化气体的体积分数为0.1~5%;B)对预热后的电芯进行保温保压;C)重复步骤A)和B)至少一次;D)向烘烤设备中充入氮气至常压,进行氮气冷却循环,完成烘烤。本方法通过化学方法改变水分子的存在形态,通过在烘烤过程任意时间通入氨气,氨气分子与结合水和或非结合水通过氢键或化学键结合,氨气分子和水结合后可以显著降低混合物的沸点,使得在消耗更低能量下实现水分的高效去除。The present invention provides a rapid baking method for a battery, comprising the following steps: A) placing a battery cell in a baking device, introducing an activated gas and a carrier gas after vacuuming for preheating; the activated gas includes one or more of ammonia, carbon dioxide and formaldehyde; the carrier gas is one or more of nitrogen, argon and helium; the volume fraction of the activated gas is 0.1-5%; B) keeping the preheated battery cell warm and pressurized; C) repeating steps A) and B) at least once; D) filling the baking device with nitrogen to normal pressure, performing a nitrogen cooling cycle, and completing the baking. The method changes the existing form of water molecules by a chemical method, and by introducing ammonia at any time during the baking process, the ammonia molecules are combined with bound water and/or unbound water through hydrogen bonds or chemical bonds, and the ammonia molecules can significantly reduce the boiling point of the mixture after combining with water, so that the efficient removal of water can be achieved with lower energy consumption.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据提供的附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
图1为本发明中快速烘烤方法的工艺流程示意图。FIG. 1 is a schematic diagram of the process flow of the rapid baking method of the present invention.
具体实施方式DETAILED DESCRIPTION
本发明提供了一种电池的快速烘烤方法,包括以下步骤:The present invention provides a rapid baking method for a battery, comprising the following steps:
A)将电芯置于烘烤设备中,抽真空后通入活化气体和载气,进行预热;A) placing the battery cell in a baking device, evacuating the battery cell, introducing an activated gas and a carrier gas for preheating;
所述活化气体包括氨气、二氧化碳和甲醛中的一种或几种;所述载气为氮气、氩气和氦气中的一种或几种;所述活化气体的体积分数为0.1~5%;The activation gas includes one or more of ammonia, carbon dioxide and formaldehyde; the carrier gas is one or more of nitrogen, argon and helium; the volume fraction of the activation gas is 0.1-5%;
B)对预热后的电芯进行保温保压;B) Keeping the preheated battery cell warm and pressurized;
C)重复步骤A)和B)至少一次;C) repeating steps A) and B) at least once;
D)向烘烤设备中充入氮气至常压,进行氮气冷却循环,完成烘烤。D) Fill the baking equipment with nitrogen to normal pressure, perform nitrogen cooling cycle, and complete the baking.
准备阶段Preparation
将电芯放入烘烤设备中。Place the cells in the baking apparatus.
在本发明中,所述电芯可以是锂离子电池的电芯,也可以是钠离子电池的电芯,本发明对此不进行特殊的限定。在本发明中,所述烘烤设备为本领域技术人员常用的烘烤设备。In the present invention, the battery cell can be a lithium ion battery cell or a sodium ion battery cell, and the present invention does not specifically limit this. In the present invention, the baking equipment is a baking equipment commonly used by those skilled in the art.
通入活化气体和载气阶段Introducing activation gas and carrier gas
对放置电芯的箱体进行抽真空,然后通入活化气体和载气。The box containing the battery cells is evacuated, and then activated gas and carrier gas are introduced.
在本发明中,所述活化气体是能与水分子通过氢键或化学键结合的形成低沸点物质的小分子,优选为氨气、二氧化碳和甲醛中的一种或几种;所述载气为氮气、氩气和氦气中的一种或几种;所述活化气体占活化气体和载体总量的体积分数优选为0.1~5%,更优选为1~4%,如0.1%,0.5%,1%,1.5%,2%,2.5%,3%,3.5%,4%,4.5%,5%,优选为以上述任意数值为上限或下限的范围值。In the present invention, the activated gas is a small molecule that can combine with water molecules through hydrogen bonds or chemical bonds to form a low-boiling substance, preferably one or more of ammonia, carbon dioxide and formaldehyde; the carrier gas is one or more of nitrogen, argon and helium; the volume fraction of the activated gas in the total amount of the activated gas and the carrier is preferably 0.1-5%, more preferably 1-4%, such as 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, preferably a range value with any of the above values as the upper or lower limit.
预热阶段Warm-up phase
对放置有电芯的箱体加热,进行预热。Heat the box containing the battery cells for preheating.
在本发明中,所述预热过程中,升温至温度为80~115℃,优选为85~110℃,如80℃,85℃,90℃,95℃,100℃,105℃,110℃,115℃,优选为以上述任意数值为上限或下限的范围值;所述预热过程的总时间优选为10~120min,更优选为20~100min,如10min,20min,30min,40min,50min,60min,70min,80min,90min,100min,110min,120min,优选为以上述任意数值为上限或下限的范围值;所述预热过程中的绝对气压优选为30000~99000Pa,更优选为50000~80000Pa,如30000Pa,40000Pa,50000Pa,60000Pa,70000Pa,80000Pa,90000Pa,99000Pa,优选为以上述任意数值为上限或下限的范围值。In the present invention, during the preheating process, the temperature is raised to 80-115°C, preferably 85-110°C, such as 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, preferably a range value with any of the above values as the upper or lower limit; the total time of the preheating process is preferably 10-120min, more preferably 20-100min, such as 10min, 20min, 30min, 40min, 50min, 60min, 70min, 80min , 90min, 100min, 110min, 120min, preferably a range value with any of the above values as the upper or lower limit; the absolute gas pressure in the preheating process is preferably 30000-99000Pa, more preferably 50000-80000Pa, such as 30000Pa, 40000Pa, 50000Pa, 60000Pa, 70000Pa, 80000Pa, 90000Pa, 99000Pa, preferably a range value with any of the above values as the upper or lower limit.
保温保压阶段Heat preservation and pressure holding stage
完成预热后,本发明抽真空并维持真空度10-200Pa,并保持所述箱体内温度80-115℃的条件下进行保温保压。After preheating, the present invention evacuates and maintains a vacuum degree of 10-200 Pa, and maintains the temperature and pressure inside the box at 80-115° C.
在本发明中,所述保温保压的真空度优选为10~200Pa,更优选为50~150Pa,如10Pa,20Pa,30Pa,40Pa,50Pa,60Pa,70Pa,80Pa,90Pa,100Pa,110Pa,120Pa,130Pa,140Pa,150Pa,160Pa,170Pa,180Pa,190Pa,200Pa,优选为以上述任意数值为上限或下限的范围值;所述保温保压的温度优选为80~115℃,优选为85~110℃,如80℃,85℃,90℃,95℃,100℃,105℃,110℃,115℃,优选为以上述任意数值为上限或下限的范围值;所述保温保压的时间优选为10~120min,更优选为20~100min,如10min,20min,30min,40min,50min,60min,70min,80min,90min,100min,110min,120min,优选为以上述任意数值为上限或下限的范围值。In the present invention, the vacuum degree of the heat preservation and pressure holding is preferably 10-200Pa, more preferably 50-150Pa, such as 10Pa, 20Pa, 30Pa, 40Pa, 50Pa, 60Pa, 70Pa, 80Pa, 90Pa, 100Pa, 110Pa, 120Pa, 130Pa, 140Pa, 150Pa, 160Pa, 170Pa, 180Pa, 190Pa, 200Pa, preferably a range value with any of the above values as the upper or lower limit; the temperature of the heat preservation and pressure holding is preferably 80-115°C, preferably 8 The temperature of the mixture is preferably 5 to 110°C, such as 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, preferably a range value with the above arbitrary numerical values as the upper or lower limit; the time for heat preservation and pressure holding is preferably 10 to 120min, more preferably 20 to 100min, such as 10min, 20min, 30min, 40min, 50min, 60min, 70min, 80min, 90min, 100min, 110min, 120min, preferably a range value with the above arbitrary numerical values as the upper or lower limit.
循环阶段Cycle Phase
本发明优选重复上述通入活化气体和载体阶段-预热阶段-保温保压阶段至少1次。The present invention preferably repeats the above-mentioned activation gas and carrier introduction stage - preheating stage - heat and pressure maintenance stage at least once.
氮气冷却循环阶段Nitrogen cooling cycle stage
向烘烤设备中充入氮气至常压,先在常压下保持0.1~10min,然后抽真空,在真空度10~200Pa下保持0.1~10min,完成一次氮气冷却循环,本发明优选重复所述氮气冷却循环至少1次,即进行至少两次氮气冷却循环。Nitrogen is filled into the baking equipment to normal pressure, and first maintained at normal pressure for 0.1 to 10 minutes, and then evacuated, and maintained at a vacuum degree of 10 to 200 Pa for 0.1 to 10 minutes to complete a nitrogen cooling cycle. The present invention preferably repeats the nitrogen cooling cycle at least once, that is, performs at least two nitrogen cooling cycles.
在本发明中,所述在常压下保持的时间优选为0.1~10min,更优选为1~8min,如0.1min,0.5min,1min,1.5min,2min,2.5min,3min,3.5min,4min,4.5min,5min,5.5min,6min,6.5min,7min,7.5min,8min,8.5min,9min,9.5min,10min,优选为以上述任意数值为上限或下限的范围值。In the present invention, the time maintained at normal pressure is preferably 0.1 to 10 min, more preferably 1 to 8 min, such as 0.1 min, 0.5 min, 1 min, 1.5 min, 2 min, 2.5 min, 3 min, 3.5 min, 4 min, 4.5 min, 5 min, 5.5 min, 6 min, 6.5 min, 7 min, 7.5 min, 8 min, 8.5 min, 9 min, 9.5 min, 10 min, preferably a range value with any of the above values as the upper or lower limit.
所述真空度优选为10~200Pa,更优选为50~150Pa,如10Pa,20Pa,30Pa,40Pa,50Pa,60Pa,70Pa,80Pa,90Pa,100Pa,110Pa,120Pa,130Pa,140Pa,150Pa,160Pa,170Pa,180Pa,190Pa,200Pa,优选为以上述任意数值为上限或下限的范围值;在上述真空度下保持的时间优选为0.1~10min,更优选为1~8min,如0.1min,0.5min,1min,1.5min,2min,2.5min,3min,3.5min,4min,4.5min,5min,5.5min,6min,6.5min,7min,7.5min,8min,8.5min,9min,9.5min,10min,优选为以上述任意数值为上限或下限的范围值。The vacuum degree is preferably 10-200 Pa, more preferably 50-150 Pa, such as 10 Pa, 20 Pa, 30 Pa, 40 Pa, 50 Pa, 60 Pa, 70 Pa, 80 Pa, 90 Pa, 100 Pa, 110 Pa, 120 Pa, 130 Pa, 140 Pa, 150 Pa, 160 Pa, 170 Pa, 180 Pa, 190 Pa, 200 Pa, preferably a range value with any of the above values as the upper or lower limit; the time maintained under the above vacuum degree The time interval is preferably 0.1-10 min, more preferably 1-8 min, such as 0.1 min, 0.5 min, 1 min, 1.5 min, 2 min, 2.5 min, 3 min, 3.5 min, 4 min, 4.5 min, 5 min, 5.5 min, 6 min, 6.5 min, 7 min, 7.5 min, 8 min, 8.5 min, 9 min, 9.5 min, 10 min, preferably with any of the above values as the upper or lower limit of the range value.
本发明提供了一种电池的快速烘烤方法,包括以下步骤:A)将电芯置于烘烤设备中,抽真空后通入活化气体和载气,进行预热;所述活化气体包括氨气、二氧化碳和甲醛中的一种或几种;所述载气为氮气、氩气和氦气中的一种或几种;所述活化气体的体积分数为0.1~5%;B)对预热后的电芯进行保温保压;C)重复步骤A)和B)至少一次;D)向烘烤设备中充入氮气至常压,进行氮气冷却循环,完成烘烤。本方法通过化学方法改变水分子的存在形态,通过在烘烤过程任意时间通入氨气,氨气分子与结合水和或非结合水通过氢键或化学键结合,氨气分子和水结合后可以显著降低混合物的沸点,使得在消耗更低能量下实现水分的高效去除。The present invention provides a rapid baking method for a battery, comprising the following steps: A) placing a battery cell in a baking device, introducing an activated gas and a carrier gas after vacuuming for preheating; the activated gas includes one or more of ammonia, carbon dioxide and formaldehyde; the carrier gas is one or more of nitrogen, argon and helium; the volume fraction of the activated gas is 0.1-5%; B) keeping the preheated battery cell warm and pressurized; C) repeating steps A) and B) at least once; D) filling the baking device with nitrogen to normal pressure, performing a nitrogen cooling cycle, and completing the baking. The method changes the existing form of water molecules by a chemical method, and by introducing ammonia at any time during the baking process, the ammonia molecules are combined with bound water and/or unbound water through hydrogen bonds or chemical bonds, and the ammonia molecules can significantly reduce the boiling point of the mixture after combining with water, so that the efficient removal of water can be achieved with lower energy consumption.
为了进一步说明本发明,以下结合实施例对本发明提供的一种电池的快速烘烤方法进行详细描述,但不能将其理解为对本发明保护范围的限定。In order to further illustrate the present invention, a rapid baking method of a battery provided by the present invention is described in detail below in conjunction with embodiments, but it should not be construed as limiting the scope of protection of the present invention.
实施例1Example 1
(1)准备阶段:把装配好的磷酸铁锂电芯装入烘烤箱体;(1) Preparation stage: put the assembled lithium iron phosphate battery into the baking box;
(2)通入活化气体和载气阶段:对放置电芯的箱体进行抽真空至50Pa,然后充氮气和氨气至绝对气压为65000Pa;优选氨气体系分数2%;(2) Introduction of activation gas and carrier gas: The box containing the battery cells is evacuated to 50 Pa, and then filled with nitrogen and ammonia until the absolute pressure is 65000 Pa; preferably, the ammonia system fraction is 2%;
(3)预热阶段:对放置有电芯的箱体进行加热,温度为95℃,预热总时间为30min;(3) Preheating stage: The box containing the battery cells is heated to 95°C and the total preheating time is 30 minutes;
(4)保温保压阶段:对预热后电池抽真空并维持真空度100Pa,并保持所述箱体内温度95℃,持续时间60min;(4) Insulation and pressure holding stage: the preheated battery is evacuated and the vacuum degree is maintained at 100 Pa, and the temperature inside the box is maintained at 95°C for 60 min;
(5)循环阶段:重复上述(2)~(4)步骤循环次数为6次;(5) Cycle stage: repeat the above steps (2) to (4) for 6 cycles;
(6)氮气冷却循环阶段:向烘烤装置中充入氮气至常压,并保持常压时间5min,然后抽真空并在真空度100Pa下保持时间5min;(6) Nitrogen cooling cycle stage: nitrogen is filled into the baking device to normal pressure and maintained at normal pressure for 5 min, then vacuum is evacuated and maintained at a vacuum degree of 100 Pa for 5 min;
(7)重复上述步骤(6)循环冷却通气次数2次。(7) Repeat the above step (6) and cycle cooling ventilation twice.
取电芯正负极极片分别使用卡尔费休水分仪测试水含量,测试温度为170℃。The positive and negative electrodes of the battery cell were tested for water content using a Karl Fischer titrator at a test temperature of 170°C.
实施例2Example 2
相对实施例1活化气体变为二氧化碳,其它保持一致。Compared with Example 1, the activated gas is changed to carbon dioxide, and the others remain the same.
实施例3Example 3
相对实施例1活化气体变为甲醛,其它保持一致。Compared with Example 1, the activated gas is changed to formaldehyde, and the others remain the same.
实施例4Example 4
相对实施例1活化气体体积分数变为0.2%,其它保持一致。The volume fraction of the activated gas was changed to 0.2% relative to Example 1, and the others remained the same.
实施例5Example 5
相对实施例1活化气体体积分数变为4%,其它保持一致。The volume fraction of the activated gas is changed to 4% relative to Example 1, and the others remain the same.
实施例6Example 6
相对实施例1把磷酸铁锂电芯更改为钠离子电芯,其中钠离子电芯正极使用普鲁士白,其它保持一致。Compared with Example 1, the lithium iron phosphate battery cell is changed to a sodium ion battery cell, wherein the positive electrode of the sodium ion battery cell uses Prussian white, and the rest remains the same.
对比例1Comparative Example 1
相对实施例1活化气体体积分数变为0%,其它保持一致。The volume fraction of the activated gas is changed to 0% relative to Example 1, and the others remain the same.
对比例2Comparative Example 2
相对实施例6活化气体体积分数变为0%,其它保持一致。The volume fraction of the activated gas is changed to 0% relative to Example 6, and the others remain the same.
实施例和对比例烘烤后的电芯水分测试如表1所示:The moisture content of the battery cells after baking in the embodiment and the comparative example is shown in Table 1:
表1实施例和对比例烘烤后的电芯的含水量Table 1 Water content of the battery cells after baking in the embodiments and comparative examples
以上所述仅是本发明的优选实施方式,应当指出,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 is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211332746.3A CN115763986B (en) | 2022-10-28 | 2022-10-28 | Quick baking method for battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211332746.3A CN115763986B (en) | 2022-10-28 | 2022-10-28 | Quick baking method for battery |
Publications (2)
Publication Number | Publication Date |
---|---|
CN115763986A CN115763986A (en) | 2023-03-07 |
CN115763986B true CN115763986B (en) | 2024-11-08 |
Family
ID=85355706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202211332746.3A Active CN115763986B (en) | 2022-10-28 | 2022-10-28 | Quick baking method for battery |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN115763986B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN119509145B (en) * | 2025-01-21 | 2025-05-06 | 宁德时代新能源科技股份有限公司 | Battery drying method and drying equipment |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107871853A (en) * | 2016-09-22 | 2018-04-03 | 皓智环球有限公司 | Method of Drying Electrode Assembly |
CN112736287A (en) * | 2020-12-25 | 2021-04-30 | 惠州亿纬创能电池有限公司 | Electrode wetting method, electrode and battery |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6193811B1 (en) * | 1999-03-03 | 2001-02-27 | Applied Materials, Inc. | Method for improved chamber bake-out and cool-down |
CN112864463B (en) * | 2020-12-31 | 2022-05-10 | 合肥国轩高科动力能源有限公司 | Rapid baking method of square lithium ion battery |
CN113363409A (en) * | 2021-05-13 | 2021-09-07 | 昆山聚创新能源科技有限公司 | Battery cell baking method |
-
2022
- 2022-10-28 CN CN202211332746.3A patent/CN115763986B/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107871853A (en) * | 2016-09-22 | 2018-04-03 | 皓智环球有限公司 | Method of Drying Electrode Assembly |
CN112736287A (en) * | 2020-12-25 | 2021-04-30 | 惠州亿纬创能电池有限公司 | Electrode wetting method, electrode and battery |
Also Published As
Publication number | Publication date |
---|---|
CN115763986A (en) | 2023-03-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN112864463B (en) | Rapid baking method of square lithium ion battery | |
CN107994261B (en) | Manufacturing method of soft package lithium ion battery | |
CN109279594B (en) | Porous carbon capable of controllably adjusting nitrogen doping amount and preparation method thereof | |
CN109841899B (en) | A kind of preparation method of three-dimensional network polymer gel electrolyte membrane based on bacterial cellulose | |
CN104577211B (en) | Preparation method of battery for improving cycle performance of lithium ion battery | |
CN107464955A (en) | A kind of electrolyte wetting method of soft bag lithium ionic cell | |
CN112797740B (en) | A kind of baking method of lithium ion battery | |
CN104779376A (en) | Lithium-sulfur battery cathode material, preparation method, and lithium-sulfur battery | |
CN115763986B (en) | Quick baking method for battery | |
CN102646809A (en) | Liquid injection activation method for flexible packaging lithium ion battery | |
CN105322232B (en) | Preparation method of electrochemical cell | |
CN105322216B (en) | Preparation method of electrochemical cell | |
CN105692616A (en) | Method for preparing supercapacitor electrode material from pine needle-base activated carbon material | |
CN105890291A (en) | Drying method for high-capacity lithium ion battery cell | |
CN110247121A (en) | The electrolyte wetting method of lithium ion battery and its lithium ion battery and electronic device being prepared | |
CN110896153A (en) | Method for improving electrolyte infiltration of soft package lithium ion battery | |
CN103130209A (en) | Preparation method of porous carbon electrode material | |
CN105390749A (en) | Preparation method of electrochemical cell | |
CN113948776A (en) | Method for improving battery cell infiltration efficiency | |
CN108376802A (en) | Battery drying method | |
CN116613384B (en) | Metal shell lithium battery baking method | |
CN209783131U (en) | Lithium ion battery cell drying device | |
CN108878829B (en) | A lithium-sulfur battery cathode material prepared from waste diatomite and preparation method thereof | |
CN106237867A (en) | A kind of blend film preparation method and application processing ammonium sulfate industrial waste gas | |
CN106654373A (en) | Device for infiltrating electric core |
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 | ||
GR01 | Patent grant | ||
GR01 | Patent grant |