CN114267891B - All-solid-state lithium battery charging temperature control method and system for inhibiting growth of lithium dendrite - Google Patents
All-solid-state lithium battery charging temperature control method and system for inhibiting growth of lithium dendrite Download PDFInfo
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- CN114267891B CN114267891B CN202111345119.9A CN202111345119A CN114267891B CN 114267891 B CN114267891 B CN 114267891B CN 202111345119 A CN202111345119 A CN 202111345119A CN 114267891 B CN114267891 B CN 114267891B
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 189
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 238000000034 method Methods 0.000 title claims abstract description 56
- 210000001787 dendrite Anatomy 0.000 title claims abstract description 25
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims description 55
- 230000008569 process Effects 0.000 claims description 27
- 239000003792 electrolyte Substances 0.000 claims description 22
- 238000009413 insulation Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 230000017525 heat dissipation Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 238000005485 electric heating Methods 0.000 claims description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004964 aerogel Substances 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000007773 negative electrode material Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 2
- 239000007787 solid Substances 0.000 abstract description 14
- 230000008859 change Effects 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 239000007784 solid electrolyte Substances 0.000 abstract description 4
- 230000037427 ion transport Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 208000028659 discharge Diseases 0.000 description 21
- 238000004321 preservation Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 14
- 230000001276 controlling effect Effects 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 238000000151 deposition Methods 0.000 description 7
- 230000008021 deposition Effects 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- WNLXKBDXIAGXQA-UHFFFAOYSA-N [Cl].[P].[S].[Li] Chemical compound [Cl].[P].[S].[Li] WNLXKBDXIAGXQA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method and a system for controlling the charging temperature of an all-solid-state lithium battery for inhibiting the growth of lithium dendrites, wherein after a charging instruction is received, the temperature in a battery compartment of the all-solid-state lithium battery is increased to a charging preset temperature, a charging circuit is switched on to start charging, and the charging preset temperature is higher than the external environment temperature; after the full-solid lithium battery is charged, the temperature in the battery compartment is continuously detected, and the temperature in the battery compartment is controlled above the working preset temperature, so that the solid electrolyte keeps good ion transport performance, the starting of the full-solid lithium battery is prevented from being influenced by environmental temperature change, and meanwhile, the ion conductivity of the full-solid lithium battery in a discharging stage can be improved. Through the staged temperature control, the working performance of the all-solid-state lithium battery is effectively improved on the basis of low energy consumption.
Description
RELATED APPLICATIONS
The invention discloses a method and a system for controlling the temperature of an all-solid-state lithium battery, which are applied for the patent application number 2021105430843, the application date 2021, the 5 th month and the 19 th day and are named as a method and a system for controlling the temperature of the all-solid-state lithium battery for inhibiting the growth of lithium dendrites.
Technical Field
The invention relates to the technical field of all-solid-state lithium batteries, in particular to a method and a system for controlling the charging temperature of an all-solid-state lithium battery for inhibiting growth of lithium dendrites.
Background
All-solid-state lithium batteries are a mainstream trend of battery development, and compared with commercial liquid lithium ion batteries, the solid-state electrolyte used by the all-solid-state batteries has the advantages of incombustibility, no corrosion, no volatilization and no leakage, so that the all-solid-state lithium batteries have better safety and longer service life. In addition, the all-solid-state lithium battery has higher energy density than the liquid lithium ion battery, and is therefore more suitable for use as a vehicle battery or an aircraft battery. However, all-solid lithium batteries still have some problems in practical use, and first, the ionic conductivity of the solid electrolyte is generally lower than that of the liquid electrolyte due to the limitation of the ion diffusion capability, and the lower ionic conductivity significantly affects the rate capability of the all-solid lithium battery. Second, voids exist in the solid electrolyte, and lithium dendrites deposited at the negative electrode may penetrate the electrolyte, resulting in short circuit failure of the battery. Therefore, the ionic conductivity of the solid electrolyte is improved, and the generation of lithium dendrites is reduced, so that the problem to be solved in the development of the all-solid-state lithium battery is solved.
The existing battery temperature control system is designed for liquid lithium ion batteries, so that in order to avoid the risk of fire, the liquid lithium ion batteries need to be continuously cooled during operation, and the design of the temperature control system is quite different from the requirements of all-solid-state lithium batteries. Although prior art studies have been conducted on the effect of temperature on the performance of all solid state lithium batteries, current studies have at least the following drawbacks:
First, some current researches are only aimed at the scenes of operating at extremely low ambient temperature of all-solid-state lithium batteries used as vehicle-mounted batteries and aircraft batteries, and neglect the temperature control of all-solid-state lithium batteries under the condition of non-severe temperature;
secondly, temperature compensation is only carried out before the charging of the all-solid-state lithium battery is started, and temperature control in the whole charging process after the charging is started is ignored;
thirdly, the prior art ignores the necessity of temperature control in a static state of non-charging and non-discharging in the discharging process of the all-solid-state lithium battery;
Fourth, in the prior art, only a conceptual temperature control strategy of preferably heating the working environment of the battery in a severe cold environment is proposed, the existing research considers the efficiency of starting charging and the electric energy loss for heating, and the correspondingly proposed typical heating target value is about 15 ℃, but the temperature rise value is not tested and calculated, and the purpose of effectively inhibiting the growth of lithium dendrites cannot be achieved.
Disclosure of Invention
The invention aims to provide a method and a system for controlling the charging temperature of an all-solid-state lithium battery, which can inhibit the growth of lithium dendrites of the all-solid-state lithium battery.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the charging temperature control method for inhibiting the growth of lithium dendrite of the all-solid-state lithium battery is characterized by judging whether the temperature in a battery compartment of the all-solid-state lithium battery is less than a first temperature threshold value or not if an instruction for charging the all-solid-state lithium battery is received, and directly switching on a charging circuit if the temperature in the battery compartment of the all-solid-state lithium battery is not less than the first temperature threshold value; if so, calculating a heating time value required for heating to the first temperature threshold according to a preset temperature model, heating the battery compartment until the required heating time value is reached, and switching on a charging circuit, wherein the setting range of the first temperature threshold is 310K-450K.
Further, the preset temperature model is as follows:
Wherein, T 1 is the required heating time value, Δx is the thickness of the heat insulation layer in the battery compartment, c p is the specific heat of the battery, ρ is the battery density, V is the battery volume, λ is the thermal conductivity of the heat insulation layer, a is the total heat dissipation area of the heat insulation layer, q is the total heating power of the electric heater for heating the battery compartment, T 1 is the first temperature threshold, and T 0 is the external environment temperature of the battery compartment.
Further, the charging temperature control method controls the temperature in a battery compartment of the all-solid-state lithium battery to be more than or equal to 330K and less than or equal to 450K, starts the charging process, and keeps the temperature in the battery compartment to be more than or equal to 310K and less than or equal to 450K before the charging process is finished.
Further, after the charging process is finished, the temperature in the battery compartment is continuously controlled to be not less than a second temperature threshold, and the setting range of the second temperature threshold is 280K to 450K.
Further, the first temperature threshold is set in a range of 330K to 450K.
Further, an electric heating element for heating the battery compartment and a temperature sensor for detecting the temperature in the battery compartment are arranged, after an instruction for charging the all-solid-state lithium battery is received, if the temperature sensor detects that the temperature value is lower than 310K, a circuit of the electric heating element and a power supply is connected, and until the temperature sensor detects that the temperature value reaches 330K, the electric heating element stops working and the charging circuit is connected.
Further, the power supply is an external power supply or the all-solid-state lithium battery in the battery compartment, wherein the external power supply is a renewable energy power supply component or a non-renewable energy power supply component.
In another aspect, the present invention also provides an all-solid-state lithium battery temperature control system for inhibiting growth of lithium dendrites, comprising:
the battery charging and discharging module comprises an all-solid-state lithium battery, a controllable charging circuit and a controllable discharging circuit;
the battery compartment is used for placing the all-solid-state lithium battery;
The temperature sensor is used for detecting the temperature in the battery compartment;
The controllable heater is used for increasing the temperature in the battery compartment;
the control module is electrically connected with the battery charging and discharging module, the temperature sensor and the controllable heater, and if the control module receives a charging instruction sent by the battery charging and discharging module and the temperature detection value sent by the temperature sensor is smaller than 330K, the control module calculates a heating time value required by heating to 330K according to a preset temperature model and controls the controllable heater to work until the required heating time value is reached, and the control module controls the controllable charging circuit to be connected; and judging whether the temperature detection value sent by the temperature sensor is lower than 310K in real time or at regular time before the charging process is finished, if yes, calculating a heating time value required by heating to 310K according to a preset temperature model by the control module, and controlling the controllable heater to work so that the temperature in the battery compartment is kept to be greater than or equal to 310K in the charging process.
Further, the preset temperature model is as follows:
Wherein, T 1 is the required heating time value, Δx is the thickness of the heat insulation layer in the battery compartment, c p is the specific heat of the battery, ρ is the battery density, V is the battery volume, λ is the thermal conductivity of the heat insulation layer, a is the total heat dissipation area of the heat insulation layer, q is the total heating power of the electric heater for heating the battery compartment, T 1 is the first temperature threshold, and T 0 is the external environment temperature of the battery compartment.
Further, on the premise that the control module does not receive the charging instruction or the discharging instruction sent by the battery charging and discharging module, and the charging circuit and the discharging circuit are in a non-connected state, if the temperature detection value sent by the temperature sensor is smaller than a second temperature threshold value, the control module controls the controllable heater to work until the temperature detection value sent by the temperature sensor reaches the second temperature threshold value, and the setting range of the second temperature threshold value is 280K to 450K.
Further, the discharging circuit is a controllable discharging circuit, if the control module receives a discharging instruction sent by the battery charging and discharging module and the temperature detection value sent by the temperature sensor is smaller than a third temperature threshold value, the control module controls the controllable heater to work until the temperature detection value sent by the temperature sensor reaches the third temperature threshold value, and then the control module controls the controllable discharging circuit to be connected; and judging whether the temperature detection value sent by the temperature sensor is lower than a third temperature threshold value in real time or at fixed time before the discharging process is finished, if yes, the control module controls the controllable heater to work so that the temperature in the battery compartment is kept to be greater than or equal to the third temperature threshold value in the discharging process, and the set value of the third temperature threshold value is greater than or equal to the second temperature threshold value.
Further, the discharging instruction includes a target discharging power, and the control module controls the temperature in the battery compartment in the discharging process according to the target discharging power, including: the larger the target discharge power is, the higher the temperature in the battery compartment is controlled by the control module before the discharge process is finished.
Further, the temperature control system of the all-solid-state lithium battery further comprises a power supply module, wherein the power supply module is used for supplying power to the controllable heater, and the power supply module is the all-solid-state lithium battery or an external power supply, and the external power supply is a renewable energy power supply assembly or a non-renewable energy power supply assembly.
Further, the positive electrode of the all-solid-state lithium battery comprises one or more of a sulfide positive electrode, an oxide positive electrode and a ternary material;
the electrolyte of the all-solid-state lithium battery comprises one or more of sulfide electrolyte and oxide electrolyte;
the negative electrode of the all-solid-state lithium battery comprises one or more of a metal lithium negative electrode, an alloy negative electrode, a carbon group negative electrode material and a lithium-free negative electrode.
Further, the battery compartment is provided with a heat-preserving cavity, and the thermal conductivity of the cavity wall material of the heat-preserving cavity ranges from 0.001 to 1.2W/(m.K); or the cavity wall of the heat-insulating cavity of the battery compartment is made of heat-insulating ceramic materials, foaming glass materials and/or aerogel.
The technical scheme provided by the invention has the following beneficial effects:
a. The temperature of the all-solid-state lithium battery in the charging process is increased, so that the ion conductivity of the all-solid-state electrolyte is increased, the Young modulus of metal lithium is reduced, the diffusion capacity of the metal lithium is improved, and the generation of lithium dendrites is effectively inhibited;
b. After the charging is finished, the battery can be kept at a stable operation temperature in a standing stage and a discharging stage, so that the influence of the reduction of the ion conductivity caused by low temperature on the normal use of the battery can be avoided;
c. By designing the heat preservation module, the heat dissipation rate in the temperature control device can be effectively reduced, so that the aim of energy conservation and temperature control is fulfilled;
d. The full-solid lithium battery is directly used for power supply in a standing/discharging stage, or renewable energy power generation methods such as a solar battery and the like are used for power supply instead of an external power supply, so that the necessary movable requirement when the full-solid lithium battery is put into use is met;
e. Different power supplies are adopted to drive the heater in the charging stage and the standing/discharging stage, and different operating temperatures are selected, so that the consumption of the temperature control device on the energy storage of the all-solid-state lithium battery can be reduced while the working performance of the all-solid-state lithium battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a temperature control method for improving the operation performance of an all-solid-state lithium battery according to an embodiment of the present invention;
fig. 2 is a schematic diagram showing the variation of the total energy consumption and the required heating time T 1 of the heater corresponding to step S1 according to the charging preset temperature T 1;
Fig. 3 is a schematic diagram showing the changes of the ionic conductivity of the all-solid-state electrolyte and the ratio of the heating power to the battery charging power at different charging preset temperatures T 1 according to step S2 of the present invention;
fig. 4 (a) is an SEM image of the deposition morphology of metallic lithium of the negative electrode of an all-solid-state lithium battery at a charging preset temperature of 300K according to an embodiment of the present invention;
fig. 4 (b) is an SEM image of the deposition morphology of metallic lithium of the negative electrode of the all-solid-state lithium battery at a preset charging temperature of 335K according to an embodiment of the present invention;
Fig. 5 is a graph showing experimental results of the variation of the cycle life T 2 of an all-solid-state lithium battery without a coated pure lithium negative electrode at different charging preset temperatures T 1 according to an embodiment of the present invention;
Fig. 6 is a schematic diagram showing a change of the energy-saving thermal insulation time T 3 with the charging preset temperature T 1 and the working preset temperature T 2 according to the step S3 of the embodiment of the invention;
fig. 7 is a schematic diagram showing the change of the heating power/battery discharge power ratio at different vehicle speeds v and different preset operating temperatures T 2 according to step S4 of the present invention;
Fig. 8 is a schematic diagram of a sustainable temperature control time T 4 when the temperature control device is driven by an all-solid-state lithium battery to heat under different preset operating temperatures T 2 according to step S4 of the present invention;
Fig. 9 is a schematic diagram of a temperature control device for improving the operation performance of an all-solid-state lithium battery according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a temperature control device using a renewable energy power module, according to an embodiment of the invention;
Wherein, the reference numerals include: 101-external power supply assembly, 102-internal power supply assembly, 103-renewable energy power supply assembly, 201-PID heater, 202-temperature sensor, 3 is insulation module, 4 is full solid-state lithium battery, 401-controllable charge-discharge circuit, and 5 is control module.
Detailed Description
For better understanding of the present invention, the objects, technical solutions and advantages thereof will be more clearly understood by those skilled in the art, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the implementation manner not shown or described in the drawings is a manner known to those of ordinary skill in the art. Additionally, although examples of parameters including particular values may be provided herein, it should be appreciated that the parameters need not be exactly equal to the corresponding values, but may be approximated to the corresponding values within acceptable error margins or design constraints. It will be apparent that the described embodiments are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or device.
The following describes a temperature control method and a device for improving the working performance of an all-solid-state lithium battery according to an embodiment of the present invention with reference to the accompanying drawings.
The battery of the electric automobile is taken as a standard to select an all-solid-state lithium battery (hereinafter may be simply referred to as a battery) analyzed by the embodiment, the electrolyte is selected to be lithium sulfur phosphorus chlorine electrolyte, the average battery capacity of the electric automobile is about 60 kW.h, the power consumption is about 14.7 kW.h/100 km, the energy density of the all-solid-state lithium battery can reach 0.9 kW.h/L, the volume of the all-solid-state lithium battery is about 67L, the size of a storage battery of the electric automobile is halved by referring to the size of the storage battery, the size of the battery is about 17mm multiplied by 62mm multiplied by 64mm, the thickness of the heat preservation layer is selected to be 5mm, the size of the all-solid-state lithium battery device is reduced by the size at the half thickness of the heat preservation layer, the three dimensional size is recorded as N 1＝20mm,N2＝65mm,N3 =69 mm, a temperature sensor and a control module are further arranged in the battery compartment, and the all-solid-state lithium battery in the battery compartment is provided with a controllable charging and discharging circuit, and corresponding interfaces thereof preferably extend to the outside or the battery compartment to the outer surface.
Fig. 1 is a flowchart of a temperature control method for improving the operation performance of an all-solid lithium battery according to an embodiment of the present invention. As shown in fig. 1, after the all-solid-state lithium battery is placed in the temperature control device, temperature control is performed in stages based on the charging, standing/discharging processes, and the temperature control method for improving the working performance of the all-solid-state lithium battery comprises the following steps:
S1, after receiving an all-solid-state lithium battery charging instruction, firstly detecting the internal temperature of the temperature control device, and when the internal temperature is lower than a first temperature threshold (hereinafter referred to as a charging preset temperature T 1), driving a heater by power supply of an external power supply or an all-solid-state lithium battery in a battery compartment, so that the internal temperature of the temperature control device is increased to the charging preset temperature T 1.
In this embodiment, the charging preset temperature T 1 is higher than 310K, and in another embodiment, the charging preset temperature T 1 is higher than 330K and does not exceed 450K.
In this embodiment, assuming that the actual temperature of the battery is T, the total heating power of the heater is q, the heated time is T, the external environment temperature of the temperature control device is T 0, the charging preset temperature is T 1, the battery density is ρ, the specific heat of the battery is c p, the battery volume is V, the thermal conductivity of the heat insulation layer is λ, the total heat dissipation area of the heat insulation layer is a, and the actual temperature change of the battery in the temperature control device is as shown in formula (1):
Solving the formula (1) to obtain:
Since the judgment criterion at the end of step S1 is that the internal temperature of the temperature control device is raised to the charging preset temperature T 1, when t=t 1, the required heating time T 1 is:
At this time, the total energy Q 1 consumed by the heater in step S1 is:
Taking the specific heat c p of the battery as 900J/(kg.K), the density ρ of the battery as 3500kg/m 3, the volume V=67L of the battery, the external environment temperature T 0 of the temperature control device as 300K, the heat dissipation area A=2× (N 1×N2+N1×N3+N2×N3) of the heat preservation as 0.01433m 2, the heat conductivity lambda of the heat preservation as 0.03W/(m.K), the thickness Deltax of the heat preservation as 5mm and the total power Q of the heater as 100W, the change schematic diagram of the total energy Q 1 consumed by the heater and the required heating time T 1 corresponding to the step S1 under the condition of different charging preset temperatures T 1 is given in FIG. 2. It can be seen that even if the charging preset temperature T 1 is as high as 450K, the required heating time is still less than 10 minutes, the total energy required by the heater is less than 0.015kw·h, and the waiting time and the energy consumption are within the feasible range for meeting the charging requirement of the electric automobile.
S2, after the internal temperature of the temperature control device reaches T 1, switching on an all-solid-state lithium battery charging circuit to start charging, and in the charging process, driving a heater by supplying power through an external power supply to keep the internal temperature of the temperature control device at T 1; by completing the charging of the all-solid-state lithium battery at a high temperature, the charging efficiency can be improved, the charging time can be shortened, the metal lithium deposited on the negative electrode is softened, the diffusion performance of lithium is improved, the lithium deposition is more uniform, and the generation of lithium dendrite is effectively inhibited.
In the step S2, the heater power is only equal to the overall heat dissipation power of the temperature control device, and under the condition that the selected parameters are the same as those in the step S1, the charging power of the all-solid-state lithium battery is 5kW, and fig. 3 shows a schematic diagram of the change of the ionic conductivity of the all-solid-state electrolyte and the ratio of the heating power to the charging power of the battery at different preset charging temperatures T 1 corresponding to the step S2 according to the embodiment of the invention. As can be seen from fig. 3, with the increase of temperature, the ionic conductivity of the electrolyte of the all-solid-state lithium battery increases exponentially, and the proportion of the heating power required by the temperature control device to the battery charging power is always less than 0.1%, which indicates that the control method can significantly improve the rate capability of the battery in the charging stage, and is expected to realize the fast charging of the battery with higher power and higher efficiency, while at the same time, the consumed additional energy is extremely small and the additional charging cost is less than 0.1%.
As an example, fig. 4 (a) and fig. 4 (b) are SEM images further showing the deposition morphology of the negative metallic lithium of the all-solid-state lithium battery at different preset charging temperatures according to an embodiment of the present invention; comparing the lithium deposition morphology of each of the conditions of 300K for the preset charging temperature in fig. 4 (a) and 335K for the preset charging temperature in fig. 4 (b), it can be seen that as the temperature increases, the lithium deposition morphology of the negative electrode metal lithium of the all-solid lithium battery in fig. 4 (b) is reduced, the lithium metal deposition is more uniform, and the surface is smoother and more rounded, which is caused by the reduction of the young modulus and the enhancement of the diffusion performance of the metal lithium due to the increase of the temperature, therefore, the increase of the temperature can also well inhibit the formation of lithium dendrites, has positive effects on the stable cycle of lithium, and proves the effect of the control method for inhibiting the growth of lithium dendrites.
In order to further verify the effect of improving the battery performance of the temperature range selected by the control method, fig. 5 shows experimental measurement results of the change of the cycle life T 2 of the all-solid-state lithium battery without the coated pure lithium negative electrode at different charging preset temperatures T 1. In order to fully explain the influence of the charging preset temperature T 1 on the cycle life of the all-solid-state lithium battery, the non-coated pure lithium negative electrode is selected to assemble the all-solid-state battery, and the electrolyte thickness is 500 mu m. The pure lithium cathode without coating is extremely easy to generate lithium dendrite at the ambient temperature, short circuit occurs in 3 circles, under the condition, the cycle life of the all-solid-state lithium battery increases exponentially along with the increase of the preset charging temperature T 1, after the preset charging temperature T 1 exceeds 360K, an experimental sample can still normally run after 120 circles are shown in the figure, no short circuit phenomenon occurs all the time, and the effects of improving the preset charging temperature on inhibiting the growth of lithium dendrite, prolonging the service life of the battery and improving the performance of the battery are fully verified. In practical application, the preparation of the all-solid-state lithium battery can select a coated modified lithium negative electrode, an alloy negative electrode, a carbon negative electrode or a non-lithium negative electrode so as to further prolong the service life of the all-solid-state lithium battery. After the alloy cathode is selected to prepare the all-solid-state battery, the charging preset temperature T 1 is increased to more than 310K, more than 1000 circles of stable circulation can be realized, the battery life can be close to 20 years by estimating the charging of the electric vehicle once a week, and the actual requirements can be well met. Therefore, the selected charging preset temperature T 1 needs to be higher than 310K.
S3, after the charging of the all-solid-state lithium battery is completed, continuously detecting the internal temperature of the temperature control device until the internal temperature of the temperature control device is reduced to a second temperature threshold (hereinafter referred to as a working preset temperature T 2);
The working preset temperature T 2 is lower than the charging preset temperature T 1; in this embodiment, the preset operating temperature T 2 is higher than 280K and does not exceed 450K.
Under the condition that the selected parameters are the same as those of the step S1, the temperature change of the all-solid-state lithium battery can be described by the formula (5):
Solving the formula (5) to obtain:
And when the S3 stage is finished, the temperature of the all-solid-state lithium battery is reduced to T 2, T=T 2 is substituted into the above formula, the S3 stage can be obtained by solving, and the heat preservation time T 2 without additional heat consumption is as follows:
Fig. 6 is a schematic diagram showing a change of the energy-saving holding time T 3 with the charging preset temperature T 1 and the working preset temperature T 2 according to the step S3 of the embodiment of the invention, and it can be seen from the observation of fig. 6 that the higher the charging preset temperature T 1, the longer the holding time T 2.
Meanwhile, according to the formula (7), when the working preset temperature T 2 is close to or even lower than the external environment temperature T 0 of the temperature control device, the heat preservation time T 3 tends to infinity, so that the temperature control does not need to enter the S4 stage, and the normal working of the all-solid-state lithium battery in the standing and discharging stages can be ensured without additional energy consumption.
S4, supplying power to drive the heater, controlling the internal temperature of the temperature control device to be above T 2 so as to avoid the influence of environmental temperature change on the starting of the all-solid-state lithium battery, and improving the ion transport performance of the all-solid-state lithium battery in the discharging stage;
in step S4, the power supply mode of the power supply driving heater may be directly powered by the all-solid-state lithium battery, or may be powered by a renewable energy power generation method such as a solar battery.
Assuming that the power consumption of the electric automobile is 14.7kw.h/100 km, fig. 7 is a schematic diagram of the change of the heating power/battery discharge power ratio at different vehicle speeds v and different preset operating temperatures T 2 corresponding to step S4 in the embodiment of the invention under the condition that the running speed of the electric automobile is v and other parameters are consistent with those selected in step S1. It can be seen that even under the condition that the vehicle speed is extremely low and the operation preset temperature T 2 is higher than the external environment temperature T 0 of the temperature control device by 40K, the ratio of the heating power to the battery discharge power is still less than 0.12%. Therefore, the energy consumption required by the temperature control device is extremely low, but the battery can be effectively ensured to be at a reasonable operating temperature.
Fig. 8 further shows a schematic diagram of a sustainable temperature control time T 4 when the temperature control device is driven to heat by the all-solid-state lithium battery under different preset operating temperatures T 2, and the battery capacity is about 60 kw.h, as can be seen from fig. 8, even if the preset operating temperature T 2 is 40K higher than the external environment temperature T 0 of the temperature control device, the temperature control device can still be always at the preset operating temperature T 2 within more than 700 days, so that the electrolyte has better ionic conductivity. This means that even if the temperature of the environment where the automobile is located is 30 ℃ below zero throughout the year, the battery can still keep the temperature at 10 ℃ or above throughout the time range of about 2 years by adopting the temperature control device, so as to meet the requirement of emergency starting at any time.
In addition, when the renewable energy power generation method is adopted for power supply, the heater does not consume the energy stored by the battery, and the sustainable temperature control time directly depends on the service life of the renewable energy power supply system and is not influenced by the capacity of the battery.
Optionally, when the discharge power needs to be increased, a third temperature threshold (hereinafter referred to as a discharge preset temperature T 3) may be further set according to the performance requirement, and when the temperature sensor detects that the internal temperature of the temperature control device is lower than or equal to the discharge preset temperature T 3, the heater is driven by power supply, so that the internal temperature of the temperature control device is kept above the discharge preset temperature T 3, and the ion transport performance of the all-solid-state lithium battery in the discharge stage is further improved;
The discharge preset temperature T 3 is higher than the operation preset temperature T 2.
Because the optional steps are basically consistent with the heating and heat dissipation conditions corresponding to the step S4, the energy duty ratio and the sustainable operation time required for controlling the battery temperature to the discharge preset temperature T 3 can be analyzed by replacing the operation preset temperature T 2 in fig. 7 and 8 with the discharge preset temperature T 3.
The invention is not limited to the specific embodiments, and the temperature control method for improving the working performance of the all-solid-state lithium battery provided by the invention can be widely applied to the field and other fields related to the field, and can be implemented by adopting other various specific embodiments. For example, the temperature of the all-solid-state battery is regulated and controlled in stages based on the working state of the battery, so that the design idea of the working performance of the battery is improved, the working performance of other batteries is improved, or the heater distribution optimization, the temperature control optimization and the like are additionally and simply carried out on the basis of the design. Therefore, the design of the invention is simply changed or modified, and the design falls within the protection scope of the invention.
In summary, the embodiment of the invention can effectively improve the temperature of the all-solid-state lithium battery in the charging process, so as to improve the ion conductivity of the all-solid-state electrolyte, reduce the Young modulus of metal lithium, improve the diffusion capability of the metal lithium and effectively inhibit the generation of lithium dendrites; after the charging is finished, the battery can be kept at a stable operation temperature in a standing stage and a discharging stage, so that the reduction of ion conductivity caused by low temperature is avoided, and the normal use of the battery is prevented from being influenced; by designing the heat-insulating structure, the heat dissipation rate in the temperature control device can be effectively reduced, so that the aim of energy conservation and temperature control is fulfilled; different power supplies are adopted to drive the heater in the charging stage and the standing/discharging stage, different operating temperatures are selected, and the consumption of the temperature control device on the energy storage of the all-solid-state lithium battery can be reduced while the working performance of the all-solid-state lithium battery is improved through staged temperature control.
In addition, when the renewable energy power generation method is adopted for power supply, the heater does not consume the energy stored by the battery, and the sustainable temperature control time directly depends on the service life of the renewable energy and is not influenced by the capacity of the battery. The full-solid lithium battery is directly used for power supply in a standing/discharging stage, or renewable energy power generation methods such as a solar battery and the like are used for power supply instead of an external power supply, so that the necessary movable requirement when the full-solid lithium battery is put into use is met.
Next, a temperature control device for improving the operation performance of an all-solid-state lithium battery according to an embodiment of the present invention will be described with reference to fig. 9.
Fig. 9 is a schematic diagram of a temperature control device for improving the operation performance of an all-solid-state lithium battery according to an embodiment of the present invention;
The temperature control device for improving the working performance of the all-solid-state lithium battery comprises: the device comprises a double-circuit power supply module, a controllable heating module, a heat preservation module, a battery charging and discharging module and a control module.
The two-way power supply module comprises an external power supply assembly 101 capable of using an external power supply and an internal power supply assembly 102 capable of directly supplying power by using an internal all-solid-state lithium battery;
The controllable heating module comprises a PID heater 201 and a temperature sensor 202, and controls the internal temperature of the temperature control device to be at a preset temperature T 1 or to be kept above a preset temperature T 2 according to the charge-discharge stage of the all-solid-state lithium battery;
the heat preservation module 3 is a heat preservation cavity which is made of a heat preservation material with low heat conductivity and can be used for placing an all-solid-state lithium battery, so that the electric energy required by heating the cavity is saved;
the battery charging and discharging module comprises an all-solid-state lithium battery 4 and an all-solid-state lithium battery controllable charging and discharging circuit 401;
the control module 5 is used for controlling the two-way power supply module, the controllable heating module and the battery charging and discharging module to realize staged temperature control according to the charging and discharging stage and the internal temperature of the temperature control device.
The two-way power supply module can also be added with renewable energy power supply components such as a solar battery power supply component, and at the moment, a schematic diagram of a temperature control device using the renewable energy power supply component is shown in fig. 10. In contrast to fig. 9, the design of fig. 10 replaces the built-in power supply assembly 102 of the two-way power supply module, which can be directly powered using an internal all-solid-state lithium battery, with a renewable energy power supply assembly 103. It is obvious that a three-way power supply module (not shown) may also be provided, namely comprising an external power supply assembly 101, an internal power supply assembly 102 directly powered by an internal all-solid-state lithium battery, and a renewable energy power supply assembly 103.
In addition, the temperature control device for the working performance of the all-solid-state lithium battery according to the above embodiment of the present invention may further have the following additional technical features:
The temperature measured by the temperature sensor in the controllable heating module can be used as a judging standard for controlling the opening or closing of the two-way power supply module and the battery charging and discharging module:
specifically, after receiving the charging instruction of the all-solid-state lithium battery, when the temperature sensor 202 detects that the internal temperature of the temperature control device is lower than the charging preset temperature T 1, the control module 5 preferably controls to start the external power supply assembly 101 of the two-way power supply module, and drives the controllable heating module PID heater 201 to raise the internal temperature of the temperature control device to the charging preset temperature T 1; in the charging stage, an external power supply can be adopted, a heater is driven by larger power, the inside of the temperature control device can be kept at a higher temperature, at the moment, the all-solid-state lithium battery can be charged at a high temperature, so that the ion conductivity of the all-solid-state electrolyte during charging is improved, the charging efficiency is further improved, the metal lithium deposited on the negative electrode is softened, the diffusion performance of lithium is improved, the lithium deposition is more uniform, and the generation of lithium dendrite is effectively inhibited.
After the temperature sensor 202 detects that the internal temperature of the temperature control device reaches T 1, the control module 5 controls the battery controllable charging and discharging circuit 401 to be connected, if the detected temperature is reduced below T 1 in the battery charging process, an external power supply assembly of the two-way power supply module is started, and the controllable heating module PID heater 201 is driven to keep the internal temperature of the temperature control device at T 1;
After the charging of the all-solid-state lithium battery is completed, the control module 5 controls the battery controllable charging and discharging circuit 401 to be closed, and the temperature sensor 202 detects and continuously detects the internal temperature of the temperature control device until the internal temperature of the temperature control device is reduced to a working preset temperature T 2;
After the temperature sensor 202 detects that the internal temperature of the temperature control device is reduced to T 2, the control module 5 controls the built-in power supply assembly 102 or the renewable energy power supply assembly 103 to be started and controlled, drives the PID heater 201 and controls the internal temperature of the temperature control device to be more than T 2; after the charging is finished, the battery is kept at a stable operation temperature in a standing stage and a discharging stage so as to avoid the influence of the reduction of ion conductivity caused by low temperature on the normal use of the battery; at this time, since it is difficult to use an external power source in the non-charging stage, it is necessary to use an all-solid-state lithium battery or other renewable energy power supply device to supply power, and therefore, the operating temperature at this time needs to be appropriately reduced compared with the charging stage to avoid excessive energy consumption.
Optionally, when the discharge power needs to be increased, the discharge preset temperature T 3 may be further set according to the performance requirement, and after entering the discharge stage, when the temperature sensor 202 detects that the internal temperature of the temperature control device is lower than or equal to the discharge preset temperature T 3, the control module 5 controls to start and control the built-in power supply assembly 102 or the renewable energy power supply assembly 103, drives the PID heater 201, and maintains the internal temperature of the temperature control device above the discharge preset temperature T 3; the discharge preset temperature T 3 is higher than the operation preset temperature T 2.
In order to ensure the heat preservation and energy saving effects, the heat preservation material adopted by the heat preservation module has a heat conductivity lower than 1.2W/(m.K), preferably lower than 0.12W/(m.K), and comprises aerogel, foaming glass, heat preservation ceramic material and the like.
It should be noted that the foregoing explanation of the embodiment of the temperature control method for improving the working performance of the all-solid lithium battery is also applicable to the temperature control device for improving the working performance of the all-solid lithium battery of this embodiment, and will not be repeated here. Meanwhile, the arrangement modes of the PID heater and the temperature sensor in the figures 9 and 10 are only used as illustrations, the PID heater and the temperature sensor can be arranged at any position in the temperature control device or can be uniformly distributed in the temperature control device, and the number of the PID heater and the temperature sensor can be more than or equal to one.
According to the temperature control device for improving the working performance of the all-solid-state lithium battery, provided by the embodiment of the invention, the high-temperature charging of the all-solid-state lithium battery under the condition of the charging preset temperature T 1, the controllable temperature condition discharging under the condition of the working preset temperature T 2 or the discharging preset temperature T 3 and the long-time stable temperature condition storage under the condition of the working preset temperature T 2 can be realized by constructing the two-way power supply module, the controllable heating module, the heat preservation module and the battery charging and discharging module. Therefore, the ionic conductivity of the all-solid-state electrolyte can be improved, the generation of lithium dendrites is effectively inhibited, and the rapid starting of the battery under the condition of extremely low external environment temperature is ensured.
By adopting the temperature control method and the device for the all-solid-state lithium battery, the temperature of the all-solid-state lithium battery in the charging process can be effectively increased, so that the ion conductivity of the all-solid-state electrolyte is improved, the Young modulus of metal lithium is reduced, the diffusion capacity of the metal lithium is improved, and the generation of lithium dendrites is effectively inhibited; after the charging is finished, the battery can be kept at a stable operation temperature in a standing stage and a discharging stage, so that the reduction of ion conductivity caused by low temperature is avoided, and the normal use of the battery is prevented from being influenced; in addition, through the design of the heat preservation module, the heat dissipation rate in the temperature control device can be effectively reduced, so that the aim of energy conservation and temperature control is fulfilled; the internal power supply assembly and the renewable energy power supply assembly which can directly supply power by using the internal all-solid-state lithium battery are designed, and the external power supply is not used for supplying power, so that the temperature control device can independently operate without depending on other devices after the all-solid-state lithium battery is charged, and the necessary movable requirement when the all-solid-state lithium battery is put into use is met; different power supplies are adopted to drive the heater in the charging stage and the standing/discharging stage, different operating temperatures are selected, and the temperature control device can reduce the consumption of the temperature control device on the energy storage of the all-solid-state lithium battery while improving the working performance of the all-solid-state lithium battery through staged temperature control, namely, the effective improvement of the working performance of the all-solid-state lithium battery is realized on the basis of low energy consumption.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
The above description is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1.A charging temperature control method for inhibiting growth of lithium dendrite of all-solid-state lithium battery is characterized by preventing lithium dendrite deposited at the negative electrode of all-solid-state lithium battery from penetrating through electrolyte to cause short circuit of battery, if an instruction for charging all-solid-state lithium battery is received, judging whether the temperature in a battery compartment of the all-solid-state lithium battery is less than a first temperature threshold, if not, directly switching on a charging circuit; if so, calculating a heating time value required for heating to the first temperature threshold according to a preset temperature model, heating the battery compartment until the required heating time value is reached, and switching on a charging circuit, wherein the setting range of the first temperature threshold is 330K to 450K;
The charging process is started on the premise that the temperature in a battery compartment of the all-solid-state lithium battery is controlled to be more than or equal to 330K and less than or equal to 450K, and the temperature in the battery compartment is kept to be more than or equal to 310K and less than or equal to 450K before the charging process is finished;
after the charging process is finished, continuously controlling the temperature in the battery compartment to be not less than a second temperature threshold, wherein the setting range of the second temperature threshold is 280K to 450K;
wherein, the preset temperature model is: Wherein, T 1 is the required heating time value, Δx is the thickness of the heat insulation layer in the battery compartment, c p is the specific heat of the battery, ρ is the battery density, V is the battery volume, λ is the thermal conductivity of the heat insulation layer, a is the total heat dissipation area of the heat insulation layer, q is the total heating power of the electric heater for heating the battery compartment, T 1 is the first temperature threshold, and T 0 is the external environment temperature of the battery compartment.
2. The charging temperature control method according to claim 1, wherein an electric heating element for heating the battery compartment and a temperature sensor for detecting the temperature in the battery compartment are provided, and after receiving an instruction for charging the all-solid-state lithium battery, if the temperature sensor detects that the temperature value is lower than 310K, a circuit of the electric heating element and a power supply is turned on until the temperature sensor detects that the temperature value reaches 330K, the electric heating element stops working and the charging circuit is turned on.
3. The temperature control method of claim 2, wherein the power supply is an external power supply or the all-solid-state lithium battery in a battery compartment, wherein the external power supply is a renewable energy power supply component or a non-renewable energy power supply component.
4. An all-solid-state lithium battery temperature control system that inhibits growth of lithium dendrites, wherein lithium dendrites deposited at a negative electrode of an all-solid-state lithium battery are prevented from penetrating an electrolyte to cause a short circuit of the battery, the system comprising:
the battery charging and discharging module comprises an all-solid-state lithium battery, a controllable charging circuit and a controllable discharging circuit;
the battery compartment is used for placing the all-solid-state lithium battery;
The temperature sensor is used for detecting the temperature in the battery compartment;
The controllable heater is used for increasing the temperature in the battery compartment;
the control module is electrically connected with the battery charging and discharging module, the temperature sensor and the controllable heater, and if the control module receives a charging instruction sent by the battery charging and discharging module and the temperature detection value sent by the temperature sensor is smaller than 330K, the control module calculates a heating time value required by heating to 330K according to a preset temperature model and controls the controllable heater to work until the required heating time value is reached, and the control module controls the controllable charging circuit to be connected; judging whether the temperature detection value sent by the temperature sensor is lower than 310K in real time or at fixed time before the charging process is finished, if yes, calculating a heating time value required by heating to 310K according to a preset temperature model by the control module, and controlling the controllable heater to work so that the temperature in a battery compartment is kept to be greater than or equal to 310K in the charging process;
wherein, the preset temperature model is: Wherein T 1 is a required heating time value, Δx is the thickness of an insulating layer in a battery compartment, c p is the specific heat of the battery, ρ is the density of the battery, V is the volume of the battery, λ is the thermal conductivity of the insulating layer, a is the total heat dissipation area of the insulating layer, q is the total heating power of an electric heater for heating the battery compartment, T 1 is a first temperature threshold, and T 0 is the external ambient temperature of the battery compartment;
On the premise that the control module does not receive a charging instruction or a discharging instruction sent by the battery charging and discharging module, and the charging circuit and the discharging circuit are in a non-connected state, if the temperature detection value sent by the temperature sensor is smaller than a second temperature threshold value, the control module controls the controllable heater to work until the temperature detection value sent by the temperature sensor reaches the second temperature threshold value, and the setting range of the second temperature threshold value is 280K to 450K;
The discharging circuit is a controllable discharging circuit, and if the control module receives a discharging instruction sent by the battery charging and discharging module and the temperature detection value sent by the temperature sensor is smaller than a third temperature threshold value, the control module controls the controllable heater to work until the temperature detection value sent by the temperature sensor reaches the third temperature threshold value, and the control module controls the controllable discharging circuit to be connected; and judging whether the temperature detection value sent by the temperature sensor is lower than a third temperature threshold value in real time or at fixed time before the discharging process is finished, if yes, the control module controls the controllable heater to work so that the temperature in the battery compartment is kept to be greater than or equal to the third temperature threshold value in the discharging process, and the set value of the third temperature threshold value is greater than or equal to the second temperature threshold value.
5. The all-solid-state lithium battery temperature control system of claim 4, wherein the discharge instruction comprises a target discharge power, and the control module controls the temperature in the battery compartment during discharge according to the target discharge power, comprising: the larger the target discharge power is, the higher the temperature in the battery compartment is controlled by the control module before the discharge process is finished.
6. The all-solid-state lithium battery temperature control system of claim 4, further comprising a power module for powering the controllable heater, the power module being the all-solid-state lithium battery itself or an external power source, wherein the external power source is a renewable energy power supply component or a non-renewable energy power supply component.
7. The all-solid-state lithium battery temperature control system of claim 4, wherein the positive electrode of the all-solid-state lithium battery comprises one or more of a sulfide positive electrode, an oxide positive electrode, and a ternary material;
the electrolyte of the all-solid-state lithium battery comprises one or more of sulfide electrolyte and oxide electrolyte;
the negative electrode of the all-solid-state lithium battery comprises one or more of a metal lithium negative electrode, an alloy negative electrode, a carbon group negative electrode material and a lithium-free negative electrode.
8. The all-solid-state lithium battery temperature control system of claim 4, wherein the battery compartment has a thermal insulation cavity, and wherein a thermal conductivity of a cavity wall material of the thermal insulation cavity ranges from 0.001 to 1.2W/(m-K); or the cavity wall of the heat-insulating cavity of the battery compartment is made of heat-insulating ceramic materials, foaming glass materials and/or aerogel.
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| CN114267891A (en) | 2022-04-01 |
| CN114243133A (en) | 2022-03-25 |
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