CN114659341B - A control method for lithium-ion battery baking - Google Patents

A control method for lithium-ion battery baking Download PDF

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CN114659341B
CN114659341B CN202210199545.4A CN202210199545A CN114659341B CN 114659341 B CN114659341 B CN 114659341B CN 202210199545 A CN202210199545 A CN 202210199545A CN 114659341 B CN114659341 B CN 114659341B
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CN114659341A (en
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陈彪
周中心
李利潮
刘朝阳
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Lanjun New Energy Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/042—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/04—Heating arrangements using electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/003—Handling, e.g. loading or unloading arrangements for articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/14—Chambers, containers, receptacles of simple construction
    • F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • 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
    • 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

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Abstract

本发明涉及一种用于锂离子电池烘烤的控制方法，包括以下步骤：S1：确定烘烤设备因泄漏导致压力上升的函数，即烘烤设备的泄漏函数；S2：设定真空烘烤过程的多个参数，再将电池置于烘烤设备内进行真空烘烤，根据所述泄漏函数实时获取电池在真空烘烤过程中因水分蒸发导致压力上升的函数，即水分蒸发函数；S3：根据水分蒸发函数判断是否达到烘烤停止条件，达到则烘烤结束。与现有技术相比，该方法避免了现有技术中未考虑烘烤设备泄漏以及通过时间来控制各工步的运行而导致的效率低下的问题。

Figure 202210199545

The present invention relates to a control method for lithium-ion battery baking, comprising the following steps: S1: determining the function of the pressure rise caused by the leakage of the baking equipment, that is, the leakage function of the baking equipment; S2: setting the vacuum baking process multiple parameters, and then put the battery in the baking equipment for vacuum baking, and obtain the function of the pressure rise of the battery due to water evaporation during the vacuum baking process in real time according to the leakage function, that is, the water evaporation function; S3: According to The water evaporation function judges whether the baking stop condition is reached, and if it is reached, the baking ends. Compared with the prior art, the method avoids the problem of inefficiency caused by not considering the leakage of the baking equipment and controlling the operation of each working step in the prior art.

Figure 202210199545

Description

一种用于锂离子电池烘烤的控制方法A control method for lithium-ion battery baking

技术领域technical field

本发明涉及电池技术领域，尤其是涉及一种用于锂离子电池烘烤的控制方法。The invention relates to the technical field of batteries, in particular to a control method for baking lithium-ion batteries.

背景技术Background technique

锂离子电池制造过程中，需要将电芯进行真空烘烤除水操作，将电芯内部水含量去除至合格范围内。烘烤主要是将电池内的水分蒸发成水气，通过降低气压的方式降低水的沸点，通过加热的方式提高水分的蒸发效率。影响水分蒸发效率的主要有三个方面：温度、压力和水气含量。因为锂电池组成成分的限制，温度存在一定的上限，无法继续提高温度。同样的，因为环境、设备以及生产效率的限制，压力存在一定的下限，无限的追求低压力，会极大的降低生产效率。故从水气含量方面入手提升烘烤效率。During the manufacturing process of lithium-ion batteries, it is necessary to vacuum bake the cells to remove water, so as to remove the water content inside the cells to the acceptable range. Baking is mainly to evaporate the water in the battery into water vapor, reduce the boiling point of water by reducing the air pressure, and increase the evaporation efficiency of water by heating. There are three main aspects that affect the efficiency of water evaporation: temperature, pressure and water vapor content. Due to the limitation of the composition of the lithium battery, there is a certain upper limit on the temperature, and it is impossible to continue to increase the temperature. Similarly, due to the limitations of the environment, equipment and production efficiency, there is a certain lower limit of pressure, and the infinite pursuit of low pressure will greatly reduce production efficiency. Therefore, the baking efficiency is improved from the aspect of moisture content.

现有的烘烤方法通过程序设定时间对烘烤设备进行相应的控制和动作，整个方法的流程依次为：开始烘烤、电池预热、真空烘烤和烘烤结束。In the existing baking method, the baking equipment is controlled and acted according to the time set by the program, and the flow of the whole method is as follows: starting baking, battery preheating, vacuum baking and baking end.

其中，真空烘烤过程中的压力变化曲线如图1所示，设定真空烘烤条件为：下限100pa，上限300pa。即抽真空至100pa时停止抽真空，保持真空状态烘烤，当水分蒸发，压力上升至300pa时，打开真空管道，将压力抽至100pa时，停止抽真空，如此反复，直到达到设定的真空烘烤时间，通入一定量的氮气烘烤设定时间后抽出。Among them, the pressure change curve during the vacuum baking process is shown in Figure 1, and the vacuum baking conditions are set as follows: the lower limit is 100 Pa, and the upper limit is 300 Pa. That is, stop vacuuming when the vacuum reaches 100pa, and keep the vacuum state for baking. When the water evaporates and the pressure rises to 300pa, open the vacuum pipe, and when the pressure reaches 100pa, stop vacuuming, and repeat until the set vacuum is reached. Baking time, pass in a certain amount of nitrogen to bake for a set time and then take it out.

在真空烘烤过程中，压力达到设定上限后，抽取真空至设定下限后继续烘烤，这个过程中烘烤设备的腔体内水分含量比例并未下降，故而影响水分蒸发效率，且烘烤过程中，烘烤一段时间后的电池水含量较刚开始的一段时间的电池水含量更少，通过设定时间烘烤设备进行抽真空存在一定的浪费，效率低下。During the vacuum baking process, after the pressure reaches the set upper limit, the vacuum is drawn to the set lower limit and then the baking continues. During the process, the water content of the battery after baking for a period of time is less than that of the battery for a period of time at the beginning. There is a certain waste and low efficiency in vacuumizing the baking equipment by setting the time.

现有的烘烤方法还存在以下问题：The existing baking method also has the following problems:

(1)在电池预热过程中，一般的预热时间为1～2小时，预热时间过长，导致生产效率低下，并且在电池预热过程中，烘烤箱体内的气体受热膨胀，增加了腔体内的压力，对水分蒸发的速度有减缓作用，导致锂离子电池烘烤的效率降低。(1) During the battery preheating process, the general preheating time is 1 to 2 hours, and the preheating time is too long, resulting in low production efficiency, and during the battery preheating process, the gas in the oven body is heated and expands, increasing The pressure in the cavity is reduced, which has a slowing effect on the speed of water evaporation, resulting in a decrease in the efficiency of lithium-ion battery baking.

(2)现有的烘烤方法主要通过时间来控制各工步的运行，达到设定时间后运行下一步程序动作。该动作纯粹依靠程序时间控制，无法做到智能的根据电池水含量的高低及烘烤压力变化趋势来控制，耗费时间成本，效率低下。(2) The existing baking method mainly controls the operation of each step through time, and runs the next step of the program after the set time is reached. This action is purely controlled by the program time, and it cannot be intelligently controlled according to the water content of the battery and the change trend of the baking pressure, which is time-consuming, costly, and inefficient.

(3)现有的烘烤方法未考虑设备泄漏速率，耗费时间成本，效率低下，且产品一致性不佳。(3) The existing baking method does not consider the leakage rate of the equipment, which is time-consuming, costly, inefficient, and the product consistency is not good.

发明内容Contents of the invention

本发明的目的就是为了克服上述现有技术存在的缺陷而提供一种用于锂离子电池烘烤的控制方法，该方法避免了现有技术中未考虑烘烤设备泄漏以及通过时间来控制各工步的运行而导致的效率低下的问题。The purpose of the present invention is to provide a control method for lithium-ion battery baking in order to overcome the above-mentioned defects in the prior art. The problem of inefficiency caused by the step-by-step operation.

本发明的目的可以通过以下技术方案来实现：The purpose of the present invention can be achieved through the following technical solutions:

本发明提供一种用于锂离子电池烘烤的控制方法，包括以下步骤：The invention provides a control method for lithium-ion battery baking, comprising the following steps:

S1：确定烘烤设备因泄漏导致压力上升的函数，即烘烤设备的泄漏函数；S1: Determine the function of the pressure rise of the baking equipment due to leakage, that is, the leakage function of the baking equipment;

S2：设定真空烘烤过程的多个控制参数，再将电池置于烘烤设备内进行真空烘烤，并基于控制参数控制真空烘烤过程中各工步的进行，同时根据所述泄漏函数实时获取电池在真空烘烤过程中因水分蒸发导致压力上升的函数，即水分蒸发函数；S2: Set multiple control parameters of the vacuum baking process, then place the battery in the baking equipment for vacuum baking, and control the progress of each step in the vacuum baking process based on the control parameters, and at the same time according to the leakage function Real-time acquisition of the pressure rise function of the battery due to water evaporation during the vacuum baking process, that is, the water evaporation function;

S3：根据水分蒸发函数判断是否达到烘烤停止条件，若达到则烘烤结束。S3: judging according to the water evaporation function whether the condition for stopping the baking is reached, and if it is reached, the baking ends.

优选地，所述参数包括极限真空压强、真空度上限压强、真空度下限压强、干燥压强、终止时间、烘烤温度和抽真空时间上限。Preferably, the parameters include ultimate vacuum pressure, upper limit pressure of vacuum degree, lower limit pressure of vacuum degree, drying pressure, termination time, baking temperature and upper limit of vacuum pumping time.

优选地，所述S1具体为：Preferably, the S1 is specifically:

对于初次使用的烘烤设备，将初次使用的烘烤设备置于空载条件下，对烘烤设备的腔体内抽真空，使得腔体内的气压至极限真空压强，关闭烘烤设备的所有阀门和开关，使烘烤设备保持密封状态，收集密封状态下烘烤设备内从极限真空压强到真空度上限压强内各个时刻的压强数据，并将所有压强数据保存至计算机，由计算机根据所有压强数据确定泄漏函数。For the baking equipment used for the first time, put the baking equipment used for the first time under no-load conditions, vacuumize the cavity of the baking equipment, make the air pressure in the cavity reach the ultimate vacuum pressure, and close all the valves and valves of the baking equipment. switch to keep the baking equipment in a sealed state, collect the pressure data at each moment in the baking equipment from the ultimate vacuum pressure to the upper limit pressure of the vacuum degree in the sealed state, and save all the pressure data to the computer, which is determined by the computer based on all the pressure data leak function.

优选地，由计算机根据所有压强数据确定泄漏函数的过程具体为：Preferably, the process of determining the leakage function by the computer according to all the pressure data is specifically:

收集在空载且密封状态下烘烤设备内从极限真空压强到真空度上限压强内各个时刻的压强数据，进而获取初始压强上升函数；Collect the pressure data at each moment in the baking equipment from the ultimate vacuum pressure to the upper limit pressure of the vacuum degree in the no-load and sealed state, and then obtain the initial pressure rise function;

对所述初始压强上升函数求导，获取各个时刻的压强上升速率函数；Deriving the initial pressure rise function to obtain a pressure rise rate function at each moment;

由反函数将压强上升速率函数转化为压强上升速率随压强变化的函数，再对压强上升速率随压强变化的函数进行积分，获取泄漏函数。The pressure rise rate function is transformed into a function of the pressure rise rate changing with the pressure by the inverse function, and then the function of the pressure rise rate changing with the pressure is integrated to obtain the leakage function.

优选地，所述S2具体为：Preferably, the S2 is specifically:

将电池置于烘烤设备内进行真空烘烤，真空烘烤过程中当烘烤设备腔体内的压强上升至真空度上限压强，自动往腔体内通入惰性气体或干燥气体，使得腔体内气体压强达到干燥压强，混合均匀后抽出混合气体，直至腔体内的压强下降至真空度下限压强，继续烘烤；当腔体内压强再次升高至真空度上限压强时，再次通入惰性气体或干燥气体，混合均匀和抽出混合气体，循环工作；Put the battery in the baking equipment for vacuum baking. During the vacuum baking process, when the pressure in the cavity of the baking equipment rises to the upper limit pressure of the vacuum degree, an inert gas or dry gas is automatically introduced into the cavity to make the gas pressure in the cavity When the dry pressure is reached, the mixed gas is drawn out after mixing evenly until the pressure in the cavity drops to the lower limit pressure of the vacuum degree, and the baking is continued; when the pressure in the cavity rises to the upper limit pressure of the vacuum degree again, the inert gas or dry gas is introduced again, Mix evenly and extract the mixed gas, and work in a cycle;

同时，实时监测并获取电池在真空烘烤过程中腔体内压强上升与时间的函数，即压强上升函数，进而获取水分蒸发函数。At the same time, the function of the pressure rise and time in the cavity during the vacuum baking process of the battery is monitored and obtained in real time, that is, the pressure rise function, and then the water evaporation function is obtained.

优选地，在抽取混合气体直至腔体内的压强下降至真空度下限压强的过程中，若所需时间超过抽真空时间上限，则烘烤设备的泄漏量过大，停止烘烤设备。Preferably, during the process of pumping the mixed gas until the pressure in the cavity drops to the lower limit pressure of the vacuum degree, if the required time exceeds the upper limit of the vacuuming time, the leakage of the baking equipment is too large, and the baking equipment is stopped.

优选地，所述水分蒸发函数的计算公式为：Preferably, the calculation formula of the water evaporation function is:

Figure GDA0004206949100000031
Figure GDA0004206949100000031

式中，g(t)为水分蒸发函数，f(t)为压强上升函数，

Figure GDA0004206949100000032
为泄漏函数。where g(t) is the water evaporation function, f(t) is the pressure rise function,
Figure GDA0004206949100000032
is the leakage function.

优选地，所述S3具体为：Preferably, the S3 is specifically:

计算机根据水分蒸发函数获取此时电池烘烤水分蒸发产生的压强，若电池在设定时间内因水分蒸发产生的压强未达到真空度上限压强，则停止烘烤。The computer obtains the pressure generated by the water evaporation of the battery during baking according to the water evaporation function. If the pressure of the battery due to water evaporation within the set time does not reach the upper limit pressure of the vacuum degree, the baking is stopped.

优选地，在进行所述S2之前，对烘烤设备腔体内的气体进行气体置换。Preferably, before performing S2, the gas in the cavity of the baking equipment is replaced with gas.

优选地，所述气体置换的过程具体为：Preferably, the process of the gas replacement is specifically:

将电池置于烘烤设备内，对腔体内一次抽真空，使得腔体内的气压至真空度上限压强，进行烘烤，往腔体内通入惰性气体或干燥气体，使得腔体内压强达到干燥压强，二次抽真空，使得腔体内的气压达到真空度下限压强，实现烘烤设备内气体置换。Put the battery in the baking equipment, evacuate the cavity once, so that the air pressure in the cavity reaches the upper limit of the vacuum degree, and then bake, and pass inert gas or dry gas into the cavity, so that the pressure in the cavity reaches the dry pressure, Secondary vacuuming makes the air pressure in the cavity reach the lower limit pressure of the vacuum degree, realizing the gas replacement in the baking equipment.

与现有技术相比，本发明具有以下优点：Compared with the prior art, the present invention has the following advantages:

1、本发明提供的一种用于锂离子电池烘烤的控制方法在每次真空烘烤之前都确定泄漏函数，进而确定该次烘烤时的水分蒸发函数及烘烤的停止条件，避免了现有技术中未考虑设备泄漏速率导致烘烤效率低下的问题。1. A control method for lithium-ion battery baking provided by the present invention determines the leakage function before each vacuum baking, and then determines the water evaporation function and the stopping condition of baking during this baking, avoiding the In the prior art, the problem of low baking efficiency caused by equipment leakage rate is not considered.

2、本发明提供的一种用于锂离子电池烘烤的控制方法通过烘烤箱腔体内的气体压力的变化趋势来控制烘烤程序动作，能做到不同电池含水量自动适配合理的烘烤动作，进而极大的提高烘烤效率。2. The control method for lithium-ion battery baking provided by the present invention controls the action of the baking program through the change trend of the gas pressure in the oven cavity, and can automatically adapt to the reasonable baking of different battery water contents. Baking action, thereby greatly improving the baking efficiency.

3、本发明提供的一种用于锂离子电池烘烤的控制方法通过确定该次烘烤时的水分蒸发函数进而确定烘烤的停止条件，避免了现有技术中通过时间来控制烘烤的停导致的烘烤不充分或效率低下的问题。3. A control method for lithium-ion battery baking provided by the present invention determines the stopping condition of baking by determining the water evaporation function during this baking, avoiding the need to control baking by time in the prior art. Inadequate or inefficient baking caused by stoppage.

附图说明Description of drawings

图1为现有技术的真空烘烤过程中的烘烤箱内压力变化曲线示意图；Fig. 1 is a schematic diagram of the pressure change curve in the baking oven during the vacuum baking process of the prior art;

图2为本实施例提供的一种用于锂离子电池烘烤的控制方法的流程示意图；FIG. 2 is a schematic flowchart of a control method for baking lithium-ion batteries provided in this embodiment;

图3为本实施例提出的一种用于锂离子电池烘烤的控制方法的烘烤箱内压力变化曲线示意图。FIG. 3 is a schematic diagram of a pressure change curve in a baking oven according to a control method for lithium-ion battery baking proposed in this embodiment.

具体实施方式Detailed ways

下面结合附图和具体实施例对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

实施例Example

参考图2所示，本实施例提供一种用于锂离子电池烘烤的控制方法，包括以下步骤：Referring to Figure 2, this embodiment provides a control method for lithium-ion battery baking, including the following steps:

S1：确定烘烤设备因泄漏导致压力上升的函数，即烘烤设备的泄漏函数；S1: Determine the function of the pressure rise of the baking equipment due to leakage, that is, the leakage function of the baking equipment;

S2：设定真空烘烤过程的多个参数，再将电池置于烘烤设备内进行真空烘烤，根据泄漏函数实时获取电池在真空烘烤过程中因水分蒸发导致压力上升的函数，即水分蒸发函数；S2: Set multiple parameters of the vacuum baking process, then place the battery in the baking equipment for vacuum baking, and obtain the function of the pressure rise of the battery due to water evaporation during the vacuum baking process in real time according to the leakage function, that is, the moisture content evaporation function;

具体地，参数包括极限真空压强、真空度上限压强、真空度下限压强、干燥压强、终止时间、烘烤温度和抽真空时间上限。Specifically, the parameters include ultimate vacuum pressure, upper limit pressure of vacuum degree, lower limit pressure of vacuum degree, drying pressure, termination time, baking temperature and upper limit of vacuum pumping time.

具体地，真空度上限压强需根据具体情况在真空烘烤过程中多次设定，每次设定多个。Specifically, the upper limit pressure of the vacuum degree needs to be set multiple times during the vacuum baking process according to specific conditions, and multiple sets are set each time.

具体地，参考图3所示，将电池置于烘烤设备内进行真空烘烤，真空烘烤过程中当烘烤设备腔体内的压强上升至真空度上限压强(如图3所示的第一曲线高点)，自动往腔体内通入惰性气体或干燥气体，使得腔体内气体压强达到干燥压强，混合均匀后抽出混合气体，直至腔体内的压强下降至真空度下限压强，继续烘烤；当腔体内压强再次升高至真空度上限压强时，再次通入惰性气体或干燥气体，混合均匀和抽出混合气体，循环工作；Specifically, as shown in FIG. 3, the battery is placed in a baking device for vacuum baking. During the vacuum baking process, when the pressure in the cavity of the baking device rises to the upper limit pressure of the vacuum degree (the first pressure shown in FIG. 3 Curve high point), automatically feed inert gas or dry gas into the cavity, so that the gas pressure in the cavity reaches the dry pressure, and after mixing evenly, extract the mixed gas until the pressure in the cavity drops to the lower limit pressure of the vacuum degree, and continue to bake; When the pressure in the cavity rises to the upper limit pressure of the vacuum degree again, inert gas or dry gas is introduced again, the mixed gas is mixed evenly and the mixed gas is drawn out, and the cycle works;

具体地，在抽取混合气体直至腔体内的压强下降至真空度下限压强的过程中，若所需时间超过抽真空时间上限，则烘烤设备的泄漏量过大，停止烘烤设备。Specifically, in the process of pumping the mixed gas until the pressure in the cavity drops to the lower limit pressure of the vacuum degree, if the required time exceeds the upper limit of the vacuuming time, the leakage of the baking equipment is too large, and the baking equipment is stopped.

同时，实时监测并获取电池在真空烘烤过程中腔体内压强上升与时间的函数，即压强上升函数，进而获取水分蒸发函数，水分蒸发函数的计算公式具体为：At the same time, real-time monitoring and acquisition of the function of the pressure rise and time in the cavity of the battery during the vacuum baking process, that is, the pressure rise function, and then the water evaporation function is obtained. The specific calculation formula of the water evaporation function is:

Figure GDA0004206949100000051
Figure GDA0004206949100000051

式中，g(t)为水分蒸发函数，f(t)为压强上升函数，

Figure GDA0004206949100000052
为泄漏函数。where g(t) is the water evaporation function, f(t) is the pressure rise function,
Figure GDA0004206949100000052
is the leakage function.

作为一种可选的实施方式，真空度下限压强为100pa，干燥压强的范围为10Kpa-100Kpa。As an optional embodiment, the lower limit pressure of the vacuum degree is 100 Pa, and the range of the drying pressure is 10KPa-100KPa.

进一步地，在进行S2前，可以先对烘烤设备腔体内的气体进行置换；Further, before performing S2, the gas in the cavity of the baking equipment can be replaced;

气体置换的过程具体为：将电池置于烘烤设备内，对腔体内一次抽真空，使得腔体内的气压至真空度上限压强，进行烘烤，往腔体内通入惰性气体或干燥气体，使得腔体内压强达到干燥压强，二次抽真空，使得腔体内的气压达到真空度下限压强，实现烘烤设备内气体置换；The process of gas replacement is as follows: the battery is placed in the baking equipment, and the cavity is evacuated once, so that the air pressure in the cavity reaches the upper limit of the vacuum degree, and the baking is performed, and an inert gas or dry gas is introduced into the cavity, so that The pressure in the cavity reaches the dry pressure, and the vacuum is pumped for the second time, so that the air pressure in the cavity reaches the lower limit pressure of the vacuum degree, and the gas replacement in the baking equipment is realized;

在S2前对烘烤设备腔体内的气体进行置换用于降低烘烤设备内气体的湿度。Before S2, the gas in the cavity of the baking equipment is replaced to reduce the humidity of the gas in the baking equipment.

S3：计算机根据水分蒸发函数判断是否达到烘烤停止条件，达到则烘烤结束。S3: The computer judges whether the baking stop condition is reached according to the water evaporation function, and if it is reached, the baking ends.

具体地，计算机根据水分蒸发函数获取此时电池烘烤水分蒸发产生的压强，若电池在终止时间内因水分蒸发产生的压强未达真空度上限压强，则停止烘烤。Specifically, the computer obtains the pressure generated by the water evaporation of the battery during baking according to the water evaporation function. If the pressure of the battery due to water evaporation within the termination time does not reach the upper limit pressure of the vacuum degree, the baking is stopped.

具体地，对于初次使用的烘烤设备，确定其泄漏函数的步骤具体为：Specifically, for the baking equipment used for the first time, the steps of determining its leakage function are as follows:

将初次使用的烘烤设备置于空载条件下，对烘烤设备的腔体内抽真空，使得腔体内的气压至极限真空压强，关闭烘烤设备的所有阀门和开关，使烘烤设备保持密封状态，收集密封状态下烘烤设备内从极限真空压强到真空度上限压强内各个时刻的压强数据，并将所有压强数据保存至计算机，由计算机根据压强数据确定泄漏函数。Put the baking equipment used for the first time under no-load conditions, vacuum the cavity of the baking equipment to make the air pressure in the cavity reach the ultimate vacuum pressure, close all valves and switches of the baking equipment, and keep the baking equipment sealed State, collect the pressure data at each moment from the ultimate vacuum pressure to the upper limit pressure of the vacuum degree in the baking equipment in the sealed state, and save all the pressure data to the computer, and the computer determines the leakage function according to the pressure data.

具体地，确定泄漏函数的过程具体为：Specifically, the process of determining the leakage function is as follows:

(1)收集在空载且密封状态下烘烤设备内从极限真空压强到真空度上限压强内各个时刻的压强数据，进而获取初始压强上升函数y1＝f(t)；(1) Collect the pressure data at each moment in the baking equipment from the ultimate vacuum pressure to the upper limit pressure of the vacuum degree in the no-load and sealed state, and then obtain the initial pressure rise function y 1 =f(t);

(2)对初始压强上升函数求导，获取各个时刻的压强上升速率函数y2＝f’(t)；(2) Deriving the initial pressure rise function to obtain the pressure rise rate function y 2 =f'(t) at each moment;

(3)由反函数将压强上升速率函数转化为压强上升速率随压强变化的函数，再对压强上升速率随压强变化的函数进行积分，获取泄漏函数

Figure GDA0004206949100000053
具体公式如下：(3) Transform the pressure rise rate function into a function of the pressure rise rate changing with the pressure from the inverse function, and then integrate the function of the pressure rise rate changing with the pressure to obtain the leakage function
Figure GDA0004206949100000053
The specific formula is as follows:

t＝f-1(y1)t=f -1 (y 1 )

y2＝f'(f-1(y1))y 2 ＝f'(f -1 (y 1 ))

Figure GDA0004206949100000061
Figure GDA0004206949100000061

作为一种可选的实施方式，极限真空压强的数值≤10pa，设定的真空度上限压强的数值为300pa或500pa。As an optional embodiment, the value of the ultimate vacuum pressure is ≤10 Pa, and the value of the upper limit pressure of the set vacuum degree is 300 Pa or 500 Pa.

具体地，对于第N次使用的烘烤设备(N≥2)，确定其泄漏函数具体为：Specifically, for the baking equipment used for the Nth time (N≥2), the leakage function is determined to be:

根据第N-1次真空烘烤时的烘烤设备的泄漏函数以及水分蒸发函数，由计算机自动校正第N次真空烘烤时的泄漏函数。According to the leakage function and the water evaporation function of the baking equipment during the N-1 vacuum baking, the leakage function of the N vacuum baking is automatically corrected by the computer.

对前面N-1次烘烤过程的大数据进行数据趋势拟合，可以得到烘烤过程中压力上升速率的变化趋势，再根据其趋势对泄露函数进行调整。Data trend fitting is carried out on the large data of the previous N-1 baking process, and the change trend of the pressure rise rate during the baking process can be obtained, and then the leakage function is adjusted according to the trend.

综上所述，本发明提供的一种用于锂离子电池烘烤的控制方法在每次真空烘烤之前都确定泄漏函数，进而确定该次烘烤时的水分蒸发函数及烘烤的停止条件，避免了现有技术中未考虑设备泄漏速率导致烘烤效率低下的问题。通过烘烤箱腔体内的气体压力的变化趋势来控制烘烤程序动作，能做到不同电池含水量自动适配合理的烘烤动作，进而极大的提高烘烤效率。通过确定该次烘烤时的水分蒸发函数进而确定烘烤的停止条件，避免了现有技术中通过时间来控制烘烤的停导致的烘烤不充分或效率低下的问题。In summary, the present invention provides a control method for lithium-ion battery baking that determines the leakage function before each vacuum baking, and then determines the water evaporation function and the baking stop conditions during this baking. , avoiding the problem in the prior art that the leakage rate of the equipment is not considered and the baking efficiency is low. The baking program action is controlled by the change trend of the gas pressure in the oven cavity, which can automatically adapt to a reasonable baking action for different battery water contents, thereby greatly improving the baking efficiency. By determining the moisture evaporation function during this baking and then determining the stopping condition of baking, the problem of insufficient baking or low efficiency caused by controlling the stopping of baking by time in the prior art is avoided.

以上详细描述了本发明的较佳具体实施例。应当理解，本领域的普通技术人员无需创造性劳动就可以根据本发明的构思做出诸多修改和变化。因此，凡本技术领域中技术人员依本发明的构思在现有技术的基础上通过逻辑分析、推理或者有限的实验可以得到的技术方案，皆应在由权利要求书所确定的保护范围内。The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (5)

1. The control method for baking the lithium ion battery is characterized by comprising the following steps of:
s1: determining a function of pressure rise of the baking equipment caused by leakage, namely a leakage function of the baking equipment;
the S1 specifically comprises the following steps:
for the baking equipment used for the first time, placing the baking equipment used for the first time under an empty load condition, vacuumizing the cavity of the baking equipment, enabling the air pressure in the cavity to reach the ultimate vacuum pressure, closing all valves and switches of the baking equipment, enabling the baking equipment to keep a sealing state, collecting pressure data of all moments from the ultimate vacuum pressure to the upper limit pressure of the vacuum degree in the baking equipment under the sealing state, storing all the pressure data to a computer, and determining a leakage function according to all the pressure data by the computer;
the process of determining the leakage function by the computer from all pressure data is specifically:
collecting pressure data of each moment from the ultimate vacuum pressure to the upper limit pressure of the vacuum degree in the baking equipment in an idle and sealed state, and further acquiring an initial pressure rising function;
deriving the initial pressure rising function, and obtaining a pressure rising rate function at each moment;
converting the function of the rising rate of the pressure into a function of the rising rate of the pressure changing along with the pressure by an inverse function, and integrating the function of the rising rate of the pressure changing along with the pressure to obtain a leakage function;
s2: setting a plurality of control parameters in the vacuum baking process, placing the battery in baking equipment for vacuum baking, controlling the process steps in the vacuum baking process based on the control parameters, and simultaneously acquiring a function of pressure rise of the battery due to moisture evaporation in the vacuum baking process, namely a moisture evaporation function, in real time according to the leakage function;
the parameters comprise ultimate vacuum pressure, upper limit vacuum pressure, lower limit vacuum pressure, drying pressure, termination time, baking temperature and upper limit vacuumizing time;
the step S2 is specifically as follows:
placing the battery in a baking device for vacuum baking, automatically introducing inert gas or dry gas into the cavity when the pressure in the cavity of the baking device rises to the upper limit pressure of the vacuum degree in the vacuum baking process, enabling the gas pressure in the cavity to reach the dry pressure, and extracting mixed gas after uniform mixing until the pressure in the cavity falls to the lower limit pressure of the vacuum degree, and continuing baking; when the pressure in the cavity rises to the upper limit pressure of the vacuum degree again, inert gas or dry gas is introduced again, the mixed gas is uniformly mixed and pumped out, and the circulation work is performed;
meanwhile, monitoring and acquiring a function of pressure rise and time in the cavity, namely a pressure rise function, of the battery in the vacuum baking process in real time, so as to acquire a water evaporation function;
the calculation formula of the water evaporation function is as follows:
Figure FDA0004223833370000021
wherein g (t) is a water evaporation function, f (t) is a pressure rising function,
Figure FDA0004223833370000022
as a leakage function;
s3: judging whether the baking stopping condition is reached according to the water evaporation function, and ending the baking if the baking stopping condition is reached.
2. The control method for baking a lithium ion battery according to claim 1, wherein in the process of extracting the mixed gas until the pressure in the cavity drops to the lower limit pressure of the vacuum degree, if the required time exceeds the upper limit of the vacuum pumping time, the leakage amount of the baking device is excessive, and the baking device is stopped.
3. The control method for baking a lithium ion battery according to claim 1, wherein S3 specifically comprises:
and the computer acquires the pressure generated by the baking moisture evaporation of the battery at the moment according to the moisture evaporation function, and if the pressure generated by the baking moisture evaporation of the battery does not reach the upper limit pressure of the vacuum degree within the set time, the baking is stopped.
4. The control method for baking a lithium ion battery according to claim 1, wherein gas in a chamber of the baking apparatus is subjected to gas substitution before the S2 is performed.
5. The method for controlling baking of lithium ion battery according to claim 4, wherein the gas replacement process is specifically:
the battery is placed in the baking equipment, the cavity is vacuumized once, so that the air pressure in the cavity reaches the upper limit pressure of the vacuum degree, baking is performed, inert gas or dry gas is introduced into the cavity, the pressure in the cavity reaches the dry pressure, and the secondary vacuumizing is performed, so that the air pressure in the cavity reaches the lower limit pressure of the vacuum degree, and air replacement in the baking equipment is realized.
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