CN115764016A - Method and system for prolonging cycle life of silicon-based negative lithium ion soft package battery - Google Patents
Method and system for prolonging cycle life of silicon-based negative lithium ion soft package battery Download PDFInfo
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- CN115764016A CN115764016A CN202211658268.5A CN202211658268A CN115764016A CN 115764016 A CN115764016 A CN 115764016A CN 202211658268 A CN202211658268 A CN 202211658268A CN 115764016 A CN115764016 A CN 115764016A
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Abstract
The application discloses a method and a system for prolonging the cycle life of a silicon-based negative lithium ion soft package battery, which comprise the following steps: s1: acquiring charge-discharge cycle performance data and pressure data of the silicon-based negative lithium ion battery; s2: obtaining a specific cycle time corresponding to the battery performance attenuation mutation based on the charge-discharge cycle performance data and the pressure data; s3: pressurizing the silicon-based negative lithium ion battery at the specific cycle time; s4: and circulating the S1, the S2 and the S3 to prolong the cycle life of the silicon-based negative lithium ion battery. The invention overcomes the expansion problem caused by silicon-based materials by increasing the external pressure at a specific time in the cycle process of the silicon-based lithium battery, thereby prolonging the cycle life of the battery; the method is real and effective through testing and easy to realize.
Description
Technical Field
The application relates to the technical field of battery management, in particular to a method and a system for prolonging the cycle life of a silicon-based negative lithium ion soft package battery.
Background
In the current lithium ion battery, graphite is the most common negative electrode material, but the theoretical capacity of the lithium ion battery is very limited and is only 372mAh/g. The use of high capacity materials instead of traditional graphite is an effective way to achieve higher energy density lithium ion batteries. Wherein, silicon (Si) reacts with lithium through alloying, and the specific capacity can reach 4200mAh/g, which is obviously higher than that of other cathode materials; and the operating voltage of silicon is suitable (<0.4Vvs.Li/Li + ) The storage capacity of the material in the crust of the earth is abundant, and the material is considered as the most potential negative electrode material. However, when silicon is operated in a lithium ion battery, the alloying reaction with lithium causes large volume expansion and contraction, and the expansion rate reaches more than 300%, so that particles are cracked and lose electric contact with an electrode; in addition, when the silicon particles are broken or even pulverized, the original Solid Electrolyte Interface (SEI) can be damaged, and a new SEI film is continuously formed, so that the electrolyte is consumed, the film thickness is increased, and the transportation of lithium ions and electrons is influenced. Thereby resulting in a rapid decay of the electrochemical performance of the silicon anode material. Therefore, there is an urgent need to develop a technology capable of extending the cycle life of a silicon-based lithium ion battery.
Aiming at the problem of low cycle life caused by the material property of the current silicon-based lithium battery, the invention provides a simple and easy strategy for prolonging the cycle life of the battery.
Disclosure of Invention
The application provides a method and a system for prolonging the cycle life of a silicon-based negative lithium ion soft package battery, wherein the problem of expansion caused by a silicon-based material is solved by increasing external pressure at a specific time in the cycle process of a silicon-based lithium battery, so that the cycle life of the battery is prolonged; the method is real and effective through testing and easy to realize.
In order to achieve the above purpose, the present application provides the following solutions:
a method for prolonging the cycle life of a silicon-based negative electrode lithium ion soft package battery comprises the following steps:
s1: acquiring charge-discharge cycle performance data and pressure data of the silicon-based negative lithium ion battery;
s2: obtaining a specific cycle time corresponding to the battery performance attenuation mutation based on the charge-discharge cycle performance data and the pressure data;
s3: pressurizing the silicon-based negative lithium ion battery at the specific cycle time;
s4: and circulating the S1, the S2 and the S3 to prolong the cycle life of the silicon-based negative lithium ion battery.
Preferably, the method for obtaining the specific cycle time corresponding to the sudden battery performance degradation based on the charge-discharge cycle performance data includes:
setting a pressure change threshold value per unit time as a determination condition;
using the unit time pressure increase value as an input;
when the pressure change value per unit time is higher than the determination condition, a specific cycle time corresponding to the sudden change in the battery performance is obtained.
Preferably, the pressure change value per unit time is monitored by a pressure monitoring device;
the specific method for monitoring comprises the following steps: and connecting the pressure monitoring device to a battery management system in a battery pack system, and sending an early warning signal of too fast pressure change to the battery management system when detecting that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value.
Preferably, at the specific cycle time, the silicon-based negative electrode lithium ion battery is pressurized by a pressurizing device;
when the pressure monitoring device monitors that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value, the pressure monitoring device sends a starting signal to the pressurizing device, and the pressurizing device can be started immediately when receiving the starting signal to pressurize the silicon-based cathode lithium ion battery.
The application also provides a system for prolonging the cycle life of the silicon-based negative lithium ion soft package battery, which comprises: the device comprises a data acquisition module, a necessary moment determination module, a pressurization module and a circulation module;
the data acquisition module is used for acquiring charge-discharge cycle performance data and pressure data of the silicon-based cathode lithium ion battery;
the necessary moment determining module is used for obtaining a specific cycle moment corresponding to the battery performance attenuation mutation based on the charge-discharge cycle performance data and the pressure data;
the pressurizing module is used for pressurizing the silicon-based negative electrode lithium ion battery at the specific cycle time;
the circulation module is used for circulating the data acquisition module, the necessary moment determination module and the pressurization module to prolong the circulation life of the silicon-based cathode lithium ion battery.
Preferably, the necessary time determination module includes: a setting unit, an input unit, and a determination unit;
the setting unit is used for setting a pressure change threshold value of a unit time as a judgment condition;
the input unit is used for taking the unit time pressure increase value as input;
the determination unit is configured to obtain a specific cycle time corresponding to the sudden change in the battery performance degradation when the pressure change value per unit time is higher than the determination condition.
Preferably, the pressure change value per unit time is monitored by a pressure monitoring device;
the specific process of monitoring comprises: and connecting the pressure monitoring device to a battery management system in a battery pack system, and sending an early warning signal of too fast pressure change to the battery management system when detecting that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value.
Preferably, at the specific cycle time, the silicon-based negative electrode lithium ion battery is pressurized by a pressurizing device;
when the pressure monitoring device monitors that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value, the pressure monitoring device sends a starting signal to the pressurizing device, and the pressurizing device can be started immediately when receiving the starting signal to pressurize the silicon-based cathode lithium ion battery.
The beneficial effect of this application does:
(1) The method can effectively improve the problem of rapid attenuation of the performance of the silicon-based lithium battery, prolong the cycle life of the silicon-based lithium battery and accelerate the industrial application of the silicon-based lithium battery in a wider range;
(2) The operation method is simple and easy to realize.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings required to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a graph showing the relationship between pressure and capacity retention rate in a cycle process of a lithium ion battery in which a silicon-based negative electrode doped with 20% silicon corresponds to a nickel-cobalt-manganese ternary positive electrode in this embodiment;
FIG. 2 is a schematic view showing the pressurizing operation in the present embodiment;
FIG. 3 is a flowchart illustrating the method for extending the cycle life of a silicon-based lithium battery according to this embodiment;
fig. 4 is a cycle life chart of the battery in the present embodiment in different constant pressure modes.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
The first embodiment is as follows:
during charge and discharge cycles of the silicon-carbon negative lithium ion battery, expansion and contraction of silicon particles/silica particles in a negative electrode can be accompanied, the expansion can bring about the change of particle volume so as to cause a soft package battery to show corresponding expansion and contraction phenomena, along with the progress of the cycle, a large number of particles represented by the silicon/silica particles can show irreversible expansion phenomena, the thickness of the battery is increased, gaps between pole pieces inside the battery are enlarged, an ion transmission path is lengthened, polarization is increased, performance is shown that the capacity retention rate of the battery is reduced, and internal resistance is increased. In the battery under the constant pressure working condition, because the external pressure of the battery is not changed, the increase of the thickness of the battery can only be inhibited within a certain range, and when the upper pressure limit caused by the increase of the thickness of the battery is consistent with the constant pressure value, the set constant pressure is not enough to inhibit the further thickening of the battery, the lithium ion intercalation and deintercalation can not be further regulated, and under the condition, the accelerated degradation phenomenon of the battery can quickly occur. Become this problem of fine solution of constant pressure operating mode, along with the change degree of battery thickness, play the purpose that restraines electrode thickness and increase, reduce polarization all the time through the pressure value that the increase constant pressure corresponds.
The application discloses a method for prolonging the cycle life of a silicon-based negative electrode lithium ion soft package battery, which comprises the steps of firstly, testing and obtaining the charge-discharge cycle performance data and the pressure data of a silicon-based negative electrode lithium ion battery (for example, a lithium ion battery with a silicon-based negative electrode doped with 20% of silicon and a ternary positive electrode of nickel, cobalt and manganese), and the test and obtaining are shown in figure 1. Based on the cycle data, a specific cycle time, i.e., a necessary time, corresponding to the abrupt change in the battery performance is determined. Referring to the time when the cell pressure variation trend changes suddenly, if the variation rate suddenly increases, a variation threshold (for example, the pressure variation is greater than or equal to 1 Pa/s) per unit time can be set by the cell management system in the working schematic diagram shown in fig. 2 and used as a determination condition, and the pressure increase value per unit time is used as an input, and when the pressure monitoring device in fig. 2 monitors that the variation value per unit time is higher than the threshold, it is considered as a necessary time. After the situation occurs in a necessary time, the external pressure is increased through the pressurizing device in fig. 2 to overcome the rapid attenuation of the lithium battery performance caused by the expansion of the silicon-based material, so as to prolong the cycle life of the silicon-based lithium battery, and at other times except the necessary time, the battery pressure shows a relatively stable increase or even a slow increase, that is, at the time when the change value in unit time is not higher than the threshold value, the battery is allowed to continue to circulate without additional pressurizing action. The operation can prolong the cycle life of the silicon-based lithium battery and accelerate the industrial application of the silicon-based lithium battery in a wider range.
In this embodiment, in one aspect, the pressure control system includes: pressure monitoring device and with pressure device, wherein:
the pressure monitoring device is used for: the battery management system is connected to a battery pack system, and when the pressure of the battery pack is detected to be greater than a preset threshold value, an early warning signal that the pressure changes too fast is sent to the battery management system, and a starting signal is sent to the pressurizing device.
It can be understood that when the pressure of the battery pack is less than or equal to the preset threshold, the battery system is in a normal working state, and at the moment, the pressurizing device does not perform additional actions and is matched with the battery system to continue to work circularly; once the pressure of the battery pack in the battery system is higher than the preset threshold value, which indicates that there is a tendency of pressure acceleration in the battery system, the battery system enters an abnormal operation state, i.e., a necessary moment.
It can be understood that when the pressure monitoring device monitors that the pressure of the battery pack is greater than the preset threshold value, the pressure monitoring system sends a starting signal to the pressurizing device, and the pressurizing device can be started immediately to pressurize when receiving the starting signal.
It can be understood that, when the pressure monitoring device monitors that the pressure of the battery pack is greater than the preset threshold, the pressure monitoring device sends an early warning signal to a battery management system in the battery system, and the battery management system can feed back the early warning signal to a user through various processing methods when receiving the early warning signal, for example, through a vehicle control unit, so that the user can know the current state of the battery pack, and for example, the battery pack can also stop supplying power by cutting off an external power supply loop of the battery pack.
The battery early warning pressurization system provided by the invention monitors the working state of the battery pack through the pressure monitoring device, if the pressure of the battery pack is greater than the preset threshold value, the battery pack is in an abnormal state, at the moment, the pressure monitoring device sends out an early warning signal to the battery management system so as to facilitate the management and control of the battery management system on the power supply of the battery pack, and in addition, a starting signal is also sent to the pressurization device so as to remind the pressurization device to pressurize the battery pack, inhibit the expansion of the battery pack, improve the attenuation of the battery and prolong the safe operation of the battery pack for a longer time.
In specific implementation, as shown in fig. 2, a DC/DC converter may be further disposed in the battery warning pressurization system provided by the present invention, and the DC/DC converter is connected to the pressure monitoring device and the battery pack, and is used for reducing a DC voltage signal of the battery pack and supplying the reduced DC voltage signal to the pressure monitoring device. The step-down here is, for example, to convert a DC high-voltage signal of the battery pack into a DC low-voltage signal of 12v, so that the DC/DC converter can be used to supply the low-voltage signal obtained by stepping down the battery pack to the pressure monitoring device.
As shown in fig. 3, a flow chart for extending the cycle life of a silicon-based lithium battery is shown as a whole. Finally, a longer cycle life of the silicon-based lithium ion battery is realized, as shown in fig. 4, which is a graph of a relationship between a capacity retention rate of the silicon-based negative lithium ion soft package battery under two different working conditions of constant pressure and variable constant pressure and a relationship between external pressure of the battery and cycle time. The solid line is the relation between the capacity retention rate and the pressure corresponding to the variable constant pressure working condition and the cycle time, and the dotted line is the relation between the capacity retention rate and the pressure corresponding to the constant pressure working condition and the cycle time. It can be obviously seen that, compared with the constant pressure working condition (dotted line), the capacity retention rate of the battery is effectively delayed under the variable constant pressure working condition (solid line), the increase of the external pressure is accompanied with the rebound of the capacity retention rate every time, and by changing the external pressure of the battery cell, when the cycle is about 600h, the capacity retention rate of the battery cell is increased from 75% under the constant pressure working condition (dotted line) to 86% under the variable constant pressure working condition (solid line), the battery attenuation is effectively delayed, and the cycle life of the battery is prolonged.
Example two:
the application also provides a system for prolonging the cycle life of the silicon-based negative lithium ion soft package battery, which comprises: the device comprises a data acquisition module, a necessary moment determination module, a pressurization module and a circulation module;
the data acquisition module is used for acquiring charge-discharge cycle performance data and pressure data of the silicon-based cathode lithium ion battery;
the necessary moment determining module is used for obtaining a specific cycle moment corresponding to the battery performance attenuation mutation based on the charge-discharge cycle performance data and the pressure data;
the pressurizing module is used for pressurizing the silicon-based cathode lithium ion battery at a specific cycle time;
the circulating module is used for circulating the data acquisition module, the necessary moment determination module and the pressurizing module, so that the circulating life of the silicon-based negative electrode lithium ion battery is prolonged.
In this embodiment, the necessary timing determining module includes: a setting unit, an input unit, and a determination unit;
the setting unit is used for setting a pressure change threshold value of a unit time as a judgment condition;
the input unit is used for taking the unit time pressure increase value as input;
the determination unit is configured to obtain a specific cycle time corresponding to the abrupt change in the battery performance degradation when the pressure change value per unit time is higher than the determination condition.
In the embodiment, the pressure change value per unit time is monitored by a pressure monitoring device;
the specific process of monitoring comprises: and connecting the pressure monitoring device to a battery management system in the battery pack system, and sending an early warning signal of too fast pressure change to the battery management system when detecting that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value.
In the embodiment, at a specific cycle time, the silicon-based negative electrode lithium ion battery is pressurized by a pressurizing device;
when the pressure monitoring device monitors that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value, the pressure monitoring device sends a starting signal to the pressurizing device, and the pressurizing device can be started immediately when receiving the starting signal to pressurize the silicon-based cathode lithium ion battery.
The above-described embodiments are merely illustrative of the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the spirit of the present application should fall within the protection scope defined by the claims of the present application.
Claims (8)
1. A method for prolonging the cycle life of a silicon-based negative electrode lithium ion soft package battery is characterized by comprising the following steps:
s1: acquiring charge-discharge cycle performance data and pressure data of the silicon-based negative lithium ion battery;
s2: obtaining a specific cycle time corresponding to the battery performance attenuation mutation based on the charge-discharge cycle performance data and the pressure data;
s3: pressurizing the silicon-based negative lithium ion battery at the specific cycle time;
s4: and circulating the S1, the S2 and the S3 to prolong the cycle life of the silicon-based negative lithium ion battery.
2. The method for prolonging the cycle life of the silicon-based negative electrode lithium ion soft package battery according to claim 1, wherein the method for obtaining the specific cycle time corresponding to the sudden battery performance decay based on the charge-discharge cycle performance data comprises the following steps:
setting a pressure change threshold value per unit time as a determination condition;
using the unit time pressure increase value as an input;
when the pressure change value per unit time is higher than the determination condition, a specific cycle time corresponding to the sudden change in the battery performance is obtained.
3. The method for prolonging the cycle life of the silicon-based negative electrode lithium ion soft package battery according to claim 2, wherein the pressure change value per unit time is monitored by a pressure monitoring device;
the specific method for monitoring comprises the following steps: and connecting the pressure monitoring device to a battery management system in a battery pack system, and sending an early warning signal of too fast pressure change to the battery management system when detecting that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value.
4. The method for prolonging the cycle life of the silicon-based negative electrode lithium ion soft package battery according to claim 3, wherein the silicon-based negative electrode lithium ion battery is pressurized by a pressurizing device at the specific cycle time;
when the pressure monitoring device monitors that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value, the pressure monitoring device sends a starting signal to the pressurizing device, and the pressurizing device can be started immediately when receiving the starting signal to pressurize the silicon-based cathode lithium ion battery.
5. The utility model provides a system for prolong silica-based negative pole lithium ion laminate polymer battery cycle life which characterized in that includes: the device comprises a data acquisition module, a necessary moment determination module, a pressurization module and a circulation module;
the data acquisition module is used for acquiring charge-discharge cycle performance data and pressure data of the silicon-based cathode lithium ion battery;
the necessary moment determining module is used for obtaining a specific cycle moment corresponding to the battery performance attenuation mutation based on the charge-discharge cycle performance data and the pressure data;
the pressurizing module is used for pressurizing the silicon-based negative electrode lithium ion battery at the specific cycle time;
the circulation module is used for circulating the data acquisition module, the necessary moment determination module and the pressurization module to prolong the circulation life of the silicon-based cathode lithium ion battery.
6. The system for extending cycle life of a silicon-based negative electrode lithium ion pouch battery according to claim 5, wherein the moment of necessity determining module comprises: a setting unit, an input unit, and a determination unit;
the setting unit is used for setting a pressure change threshold value of a unit time as a judgment condition;
the input unit is used for taking the unit time pressure increase value as input;
the determination unit is configured to obtain a specific cycle time corresponding to the sudden change in the battery performance degradation when the pressure change value per unit time is higher than the determination condition.
7. The system for prolonging the cycle life of the silicon-based negative electrode lithium ion soft package battery according to claim 6, wherein the pressure change value per unit time is monitored by a pressure monitoring device;
the specific process of monitoring comprises: and connecting the pressure monitoring device to a battery management system in a battery pack system, and sending an early warning signal of too fast pressure change to the battery management system when detecting that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value.
8. The system for prolonging the cycle life of the silicon-based negative electrode lithium ion soft package battery according to claim 7, wherein the silicon-based negative electrode lithium ion battery is pressurized by a pressurizing device at the specific cycle time;
when the pressure monitoring device monitors that the pressure of the silicon-based cathode lithium ion battery is greater than a preset threshold value, the pressure monitoring device sends a starting signal to the pressurizing device, and the pressurizing device can be started immediately when receiving the starting signal to pressurize the silicon-based cathode lithium ion battery.
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| CN202211658268.5A CN115764016A (en) | 2022-12-22 | 2022-12-22 | Method and system for prolonging cycle life of silicon-based negative lithium ion soft package battery |
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| CN202211658268.5A CN115764016A (en) | 2022-12-22 | 2022-12-22 | Method and system for prolonging cycle life of silicon-based negative lithium ion soft package battery |
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