CN113328154A - Lithium battery, mobile terminal and temperature control method of lithium battery - Google Patents

Lithium battery, mobile terminal and temperature control method of lithium battery Download PDF

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Publication number
CN113328154A
CN113328154A CN202010131553.6A CN202010131553A CN113328154A CN 113328154 A CN113328154 A CN 113328154A CN 202010131553 A CN202010131553 A CN 202010131553A CN 113328154 A CN113328154 A CN 113328154A
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China
Prior art keywords
lithium battery
battery
core
card material
temperature
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CN202010131553.6A
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Chinese (zh)
Inventor
何志明
李光胤
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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Priority to CN202010131553.6A priority Critical patent/CN113328154A/en
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • 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)
  • Automation & Control Theory (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The present disclosure relates to a lithium battery, including: electric core, electricity card material part, wherein: the electrical card material component is disposed within the electrical core for regulating a temperature of the electrical core during a charging process. According to the lithium battery charging method and device, in the lithium battery charging process, the electric card material arranged in the electric core can adjust the temperature of the electric core, so that the temperature of the electric core is improved, and the charging speed is further improved; meanwhile, the electric core can be cooled in an auxiliary manner, the long-time high temperature of the electric core is prevented from influencing the service life of the lithium battery, and the performance and the safety of the battery are ensured.

Description

Lithium battery, mobile terminal and temperature control method of lithium battery
Technical Field
The disclosure relates to the technical field of batteries, in particular to a lithium battery, a mobile terminal and a temperature control method of the lithium battery.
Background
With the continuous progress of science and technology, lithium batteries are more and more widely applied in daily life of people. For example: lithium batteries are required in electric vehicles and electronic products. Driven by the demand for use, the energy density of lithium batteries has been increasing to achieve longer endurance. There is also a problem in that the lithium battery requires a longer charging time.
In the related art, the transfer rate of lithium ions in the lithium battery is increased by means of changing the material of a battery core, improving the conductivity of electrolyte, reducing graphite particles and the like, so that the lithium battery is rapidly charged.
However, the above improvement has a great limitation, that is, changing any one material will affect the performance and life of the battery, and even there will be a risk of explosion, and there is a safety hazard.
Disclosure of Invention
In order to overcome the problems existing in the related art, the present disclosure provides a lithium battery, which can achieve the purposes of increasing the charging speed and protecting the battery cell by setting an electric card material component inside the battery cell and adjusting the temperature of the battery cell in the charging process, thereby ensuring the performance, the service life and the safety of the battery.
According to a first aspect of embodiments of the present disclosure, there is provided a lithium battery including: electric core, electricity card material part, wherein: the electric card material component is arranged in the electric core and used for adjusting the temperature of the electric core in the charging process.
In one embodiment, the lithium battery further comprises a protection circuit, wherein the protection circuit is electrically connected with the electric card material component and the battery core; when the temperature of the battery core reaches the set temperature, the protection circuit controls the power-off of the material part of the electric card.
In one embodiment, the electric card material member is disposed at a center position in a thickness direction of the cell.
In one embodiment, the cell comprises at least one positive electrode layer, at least one isolation layer and at least one negative electrode layer; the positive electrode layer, the isolation layer and the negative electrode layer are sequentially overlapped and wound outside the electric card material component.
In one embodiment, the lithium battery further comprises a housing for accommodating the battery cell, the positive electrode layer and the negative electrode layer are respectively led out of the housing to form a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab are respectively electrically connected with the protection circuit.
In one embodiment, the electric card material part is led out of the shell to form a connecting lug, and the connecting lug is electrically connected with the protection circuit.
In one embodiment, the surface of the engaging lug is provided with an insulating layer.
In one embodiment, the battery cell comprises more than two stacked battery cell groups, wherein each battery cell group comprises a positive electrode layer, a diaphragm layer and a negative electrode layer which are sequentially stacked in a cross manner; the electric card material component is arranged between two superposed electric core groups.
In one embodiment, the electrical card material component is made of a ceramic type electrical card material and is encapsulated by an encapsulation; or the electrocaloric material components are made of a polymer type electrocaloric material.
In one embodiment, the electrical card material component is made of a polymeric electrical card material.
In one embodiment, the electrical card material member is in the form of a sheet.
In one embodiment, the set temperature is between 30 and 40 degrees Celsius.
According to a second aspect of the embodiments of the present disclosure, there is provided a mobile terminal including: the terminal comprises a terminal body, wherein a battery cavity is arranged on the terminal body; the lithium battery of the first aspect or any embodiment of the first aspect is disposed in the battery cavity.
According to a third aspect of the embodiments of the present disclosure, there is provided a temperature control method of a lithium battery including an electric card material member, the method including: in the charging process of the lithium battery, electrifying the electric card material part, and monitoring the real-time temperature of the electric core of the lithium battery; and when the real-time temperature of the battery core reaches the set temperature, controlling the electric card material component to be powered off.
In an embodiment, the method further comprises: charging the battery cell with a first charging current;
and when the real-time temperature of the battery cell reaches the set temperature, charging the battery cell by using a second charging current, wherein the second charging current is smaller than the first charging current.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
in the charging process of the lithium battery, the electric card material component arranged in the electric core can adjust the temperature of the electric core, improve the temperature of the electric core and further improve the charging speed; meanwhile, the electric core can be cooled in an auxiliary manner, the long-time high temperature of the electric core is prevented from influencing the service life of the lithium battery, and the performance and the safety of the battery are ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a perspective view illustrating an overall structure of a lithium battery according to an exemplary embodiment.
Fig. 2 is a plan view illustrating an overall structure of a lithium battery according to an exemplary embodiment.
Fig. 3 is a schematic diagram illustrating electrical card material components of a lithium battery according to an exemplary embodiment.
Fig. 4 is a schematic diagram illustrating electrical card material components of a lithium battery according to another exemplary embodiment.
Fig. 5 is a control flow diagram illustrating a protection circuit of a lithium battery according to an exemplary embodiment.
Fig. 6 is a schematic diagram illustrating a cell structure of a lithium battery according to an exemplary embodiment.
Fig. 7 is an exploded view of a cell structure of a lithium battery according to another exemplary embodiment.
Fig. 8 is a schematic diagram illustrating a variation curve of a cell charging temperature rise of a lithium battery with charging time according to an exemplary embodiment.
Fig. 9 is a flowchart illustrating a temperature control method of a lithium battery according to an exemplary embodiment.
Fig. 10 is a flowchart illustrating a temperature control method of a lithium battery according to another exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
In the related art, when a lithium battery is charged, ions in the battery flow from a positive electrode to a negative electrode to generate energy. The charging speed of a lithium battery depends on the moving speed of ions. The temperature of the battery is increased, so that the moving speed of ions is increased, and the charging speed is correspondingly increased.
In order to improve the charging speed of the lithium battery, the metal sheet is inserted into the battery core of the lithium battery, the battery core is heated by electrifying the metal sheet, the temperature of the battery core is improved, and therefore the charging speed of the lithium battery is improved. However, the mode that the metal sheet directly heats the battery core is adopted, the temperature rise speed and the temperature reduction speed of the metal sheet are slow, the temperature of the metal sheet cannot be controlled, the battery core is in a continuous high-temperature state for a long time, a diaphragm and electrolyte inside the battery core can be damaged, the phenomenon of bulging or leakage is easily caused, the performance of the battery core is reduced, the service life of the battery is shortened, and even the phenomenon of explosion can be caused, so that potential safety hazards exist.
In view of this, in the lithium battery charging process, the electric card material component arranged in the battery core is powered on and powered off to adjust the temperature of the battery core, so that the battery core can be cooled in an auxiliary manner while the charging efficiency is improved, the long-time high temperature of the battery core is prevented from influencing the service life of the lithium battery, and the performance and the safety of the lithium battery are ensured.
Fig. 1 is a perspective view illustrating an overall structure of a lithium battery according to an exemplary embodiment. Fig. 2 is a plan view illustrating an overall structure of a lithium battery according to an exemplary embodiment. As shown in fig. 1 and 2, a lithium battery 100 of an embodiment of the present disclosure may include a casing 10, a battery cell 20 disposed within the casing 10, an electrical card material member 30 built in the battery cell 20, and a protection circuit 40.
As shown in fig. 1, the case 10 serves to accommodate the battery cell 20, the electric card material member 30, and the protection circuit 40. The end of the housing 10 may be connected to the end cap 50 by means of snap-fitting or adhesive, etc., and the protection circuit 40 may be mounted on the bottom of the end cap 50. The case 10 and the end cap 50 together form a closed space in which the battery cell 20, the electric card material member 30, and the protection circuit 40 are accommodated. The end cap 50 may be provided with a positive terminal (not shown) and a negative terminal (not shown) for connecting with a load (e.g., a mobile terminal such as a mobile phone, a tablet computer, etc.). The positive terminal and the negative terminal are electrically connected to the positive tab and the negative tab of the battery cell 20 through the protection circuit 40. The housing 10 may be a soft-packed plastic housing. The plastic material may be polyvinyl chloride, polyurethane or polyethylene terephthalate. The plastic shell made of the materials is light in weight, has certain hardness, and can resist external impact to protect the battery. The thickness of the case 10 may be 0.3mm or less to reduce the overall thickness of the lithium battery 100. The shape of the housing 10 may be a rectangular parallelepiped, a cylinder, or the like.
The battery cell 20 is disposed in the casing 10 and electrically connected to the protection circuit 40. The cells 20 may be wound battery cells or stacked battery cells.
The electric card material part 30 is disposed in the battery cell 20 and electrically connected to the protection circuit 40, and when the temperature of the battery cell 20 reaches a set temperature, the protection circuit 40 controls the electric card material part 30 to be powered off.
The electrocaloric material members 30 are made of a polar material having an electrocaloric effect. The Electrocaloric Effect (ECE) is a change in internal polarization state of a polar material due to a change in an applied external electric field, thereby generating a change in entropy of the material, which is externally reflected as a change in adiabatic temperature and isothermal entropy. After an external electric field is applied to the polar material, the state of electric dipoles in the material is changed, and the state is changed from an original disordered state to ordered arrangement along the direction of the electric field, so that the polarization entropy of the material is reduced. Assuming that the material is in an adiabatic environment, the total entropy value is unchanged, so that the temperature of the material is increased by the redundant lattice vibration entropy, and at the moment, if the electric field is removed, the electric dipole is restored to a disordered state from an ordered state, so that the polarization entropy of the material is increased. Under adiabatic conditions, the total entropy value is unchanged, and the lattice entropy is necessarily reduced, so that the temperature of the material system is reduced. That is, by controlling the power on and off of the electrical card material member 30 having the electrical card effect, i.e., applying and removing the electric field, the temperature change of the electrical card material member 30 can be controlled, so that the temperature of the battery cell 20 can be adjusted. In addition, the electric card material part 30 with the electric card effect also has the advantages of high temperature resistance, capability of bearing high and strong electric fields, low cost, no pollution and the like.
In this embodiment, by providing the electrical card material component 30 in the electrical core 20, in the charging process of the lithium battery 100, the electrical card material component 30 is powered on, the temperature of the electrical core 20 is raised by the temperature rise of the electrical card material component 30, the charging speed of the lithium battery 100 is increased, and the charging efficiency is further improved. After reaching the set temperature, cut off the power supply to electricity card material part 30 again, absorb the heat of electricity core 20 through the cooling of electricity card material part 30, supplementary electricity core 20 cooling avoids electric core 20 long-time high temperature state and influences the performance and the life of lithium cell, ensures the security.
In one embodiment, the electrical card material member 30 is disposed at a center position in the thickness direction of the battery cell 20. The battery cell 20 can be heated uniformly by the electric card material component 30, and the overall heating speed of the battery cell 20 is increased.
Fig. 3 is a schematic diagram illustrating a structure of an electrical card material component according to an exemplary embodiment. In one embodiment, as shown in FIG. 3, the electrical card material member 30 may be a ceramic type electrical card material and is encapsulated by an encapsulation 33. Specifically, the heating member may be formed in a sheet shape 31, and in order not to affect the charge and discharge of the lithium battery 100, the electric card material member 30 formed of a ceramic type electric card material may be enclosed in an encapsulation body 33, and the encapsulation body 33 may be polypropylene (PP), Polyethylene (PE), or polyethylene terephthalate (PET). The ceramic type electrocaloric material may be Ba (Ti)1-XSnx)O3(X ═ 0.1,0.15, and 0.175), Ba (Ti)1-XCex) O3(X ═ 0.1,0.15, and 0.2), Ba (Zr)0.2Ti0.8)O3And the like.
Fig. 4 is a schematic diagram of an electrical card material member 30 shown in accordance with another exemplary embodiment. In one embodiment, as shown in fig. 4, the electrical card material component 30 may also be made of a sheet 32 of a polymer-based electrical card material, such as polyvinylidene fluoride (PVDF) and its derivatives.
Fig. 5 is a control flow diagram of a protection circuit shown in accordance with an example embodiment.
As shown in fig. 1, 2, and 5, the protection circuit 40 is electrically connected to the battery cell 20 and the electrical card material member 30. When the temperature of the battery cell 20 reaches the set temperature, the protection circuit 40 controls the electric card material part 30 to be powered off.
Specifically, when the lithium battery 100 is charged, the battery core 20 and the electrical card material part 30 with the electrical card effect are connected to the charging power supply 50 through the protection circuit 40, the electrical card material part 30 is powered on to be heated to heat the battery core 20, and the quick charging of the lithium battery 100 can be realized, and when the temperature of the battery core 20 reaches a specified temperature, the specified temperature may be 30-40 ℃.
Fig. 8 is a graph illustrating temperature rise of charging of battery cells with charging time for different heating elements according to an exemplary embodiment.
As shown in fig. 8, a in the figure represents a cell charging temperature rise curve with charging time according to a conventional scheme (metal sheet); in the figure, b shows the change curve of the charging temperature rise of the battery cell along with the charging time by adopting the scheme of the electric card material component. In the figure, the cell charging temperature is the measured temperature of the cell, that is, (the cell charging temperature rise is the temperature at which the cell is charged — the ambient temperature), where the ambient temperature may be 20 ℃. It can be seen from the curve a and the curve b in the figure that when the battery core is heated by the electric card material component, the temperature rise speed of the battery core is higher than that when the battery core is heated by the conventional scheme (metal sheet). That is, when the battery core is heated by the electric card material component, the battery core can be heated to the temperature control point in a shorter time compared with the conventional scheme (metal sheet). That is, at approximately 200 seconds of the b-curve, the temperature of the cell reaches the temperature control point (designated temperature). The quick charge of the lithium battery can be realized.
The protection circuit 40 controls the electric card material member 30 to be powered off in time according to the set temperature. The influence on the performance and the service life caused by the damage of the material inside the battery cell 20 due to the continuous heating of the battery cell 20 by the electric card material component 30 is avoided. The protection circuit 40 may also be used to monitor other states of the battery cell 20, such as whether the charging voltage of the battery cell 20 is abnormal or whether the output current of the battery cell 20 is excessive, to determine whether to stop the output of electric energy to the battery.
In summary, since the lithium battery 100 has a certain impedance, the lithium battery itself generates a certain amount of heat, and as the heat of the lithium battery continuously rises, the impedance of the lithium battery itself decreases, and when the heat of the lithium battery reaches a certain set temperature (usually 30-40 degrees celsius), that is, when the temperature control point of the lithium battery is reached, the impedance of the lithium battery reaches the lowest, the lithium battery is charged in this state, the polarization degree of the lithium battery is low, the internal battery core has better dynamic performance, the constant-current charging time increases, and the constant-voltage time decreases. When the lithium battery 100 of the embodiment of the present disclosure is charged, the electric card material part 30 having the electric card effect is energized, and the electric card material part 30 starts to apply an electric field process, so that the battery core 20 can be rapidly heated to a specified temperature, the impedance of the battery is minimized, and the battery core 20 inside the battery has better dynamic performance, thereby increasing the charging speed of the battery. And when the temperature is set, the protection circuit 40 controls the electricity card material part 30 to cut off the power, at this moment, the electricity card material part 30 with the electricity card effect starts to remove the electric field process, thereby absorbing the heat of the battery core 20, rapidly cooling the battery core 20, and avoiding the influence of the continuous high temperature of the battery core 20 on the material inside the battery core 20 and the service life of the battery. This process requires neither external heating equipment nor changes in the electrode material, electrode solution, etc. of the battery cell 20. In addition, the electric card material part 30 with the electric card effect has the advantages of low cost, no pollution and the like, so that the manufacturing cost of the battery is low, and the battery is more environment-friendly.
Fig. 6 is a schematic diagram illustrating a cell structure of a battery according to an exemplary embodiment. In one embodiment, as shown in fig. 1 and 6, the battery cell 20 includes at least one positive electrode layer 21, at least one separation layer 22 and at least one negative electrode layer 23, and the positive electrode layer 21, the separation layer 22 and the negative electrode layer 23 are sequentially stacked on one another and wound outside the electrical card material member 30, that is, the electrical card material member 30 is embedded in the battery cell 20. Wherein the separator 22 is located between the positive electrode layer 21 and the negative electrode layer 23. The positive electrode layer 21 and the negative electrode layer 23 of the battery cell 20 respectively protrude from the case 10 to form a positive electrode tab 211 and a negative electrode tab 231, and the positive electrode tab 211 and the negative electrode tab 231 are respectively electrically connected to the protection circuit 40. Specifically, the positive tab 211 and the negative tab 231 may be electrically connected to the protection circuit 40 by welding.
In this embodiment, the positive electrode layer 21 may be a sheet made of one or more of lithium cobaltate, lithium manganate, lithium iron phosphate and ternary material (polymer of nickel cobalt manganese) commonly used in the art, and the material of the positive electrode layer 21 is not limited by the present disclosure.
The separator 22 is a microporous separator for separating the positive electrode layer from the negative electrode layer, and may be made of a functional polymer material having a nano-scale microporous structure. For preventing the occurrence of short-circuiting due to contact between the positive electrode layer and the negative electrode layer while allowing the passage of electrolyte ions. The separator 22 may be a polyolefin microporous membrane, polyethylene felt, glass fiber felt, or microglass paper, etc., as is common in the art. The present disclosure does not limit the material of the isolation layer 22.
The negative electrode layer 23 is made by mixing a negative electrode active material carbon material or non-carbon material, a binder and an additive. For example, the material can be carbon negative electrode material, alloy negative electrode material, tin-based negative electrode material, lithium-containing transition metal nitride negative electrode material, nanoscale material, nanometer negative electrode material, and the like. The present disclosure does not limit the material of the negative electrode layer 23.
In one embodiment, as shown in fig. 1 and 2, the electric card material member 30 is provided with a connection lug 301 protruding toward the housing 10, and the connection lug is electrically connected to the protection circuit 40. May be electrically connected to the protection circuit 40 by means of soldering. The surface of the connecting lug 301 is provided with an insulating layer to avoid short circuit.
Fig. 7 is an exploded view illustrating a cell of a lithium battery according to another exemplary embodiment. In one embodiment, as shown in fig. 7, the battery cell 20 may include more than two stacked battery cells 24, the battery cell 24 includes a positive electrode layer 21 ', a separator layer 22 ' and a negative electrode layer 23 ' which are sequentially stacked in a crossed manner, and the electrocaloric material component 30 is disposed between the two stacked battery cells 24.
The positive electrode layer 21 'of the present embodiment may be a sheet made of one or more of lithium cobaltate, lithium manganate, lithium iron phosphate and ternary material (polymer of nickel cobalt manganese) commonly used in the art, and the material of the positive electrode layer 21' is not limited in the present embodiment.
The separator 22' of the present embodiment is a microporous separator for separating the positive electrode layer and the negative electrode layer, and may be made of a functional polymer material having a nano-scale microporous structure. For preventing the occurrence of short circuit in contact of the positive electrode layer 21 'and the negative electrode layer 23' while allowing electrolyte ions to pass therethrough. The separator 22' may be a polyolefin microporous membrane, a polyethylene felt, a glass fiber felt, or an ultra fine glass fiber paper, etc., as is common in the art. The material of the isolation layer 22' is not limited in this embodiment.
The negative electrode layer 23' of the present embodiment is made by mixing a negative electrode active material carbon material or non-carbon material, a binder and an additive. For example, the material can be carbon negative electrode material, alloy negative electrode material, tin-based negative electrode material, lithium-containing transition metal nitride negative electrode material, nanoscale material, nanometer negative electrode material, and the like. The material of the negative electrode layer 23' is not limited in this embodiment.
According to a second aspect of the embodiments of the present disclosure, a mobile terminal is provided, which includes a terminal body, a battery cavity is disposed on the terminal body, and the lithium battery 100 described in the first aspect or any embodiment of the first aspect is disposed in the battery cavity.
Based on the same inventive concept, there is provided a temperature control method of a lithium battery according to a third aspect of the embodiments of the present disclosure, and fig. 9 is a flowchart illustrating a temperature control method of a lithium battery according to an exemplary embodiment, which may be applied to a mobile terminal, as shown in fig. 9, the lithium battery including an electric card material part, the method including steps S11 and S12:
in step S11, in the charging process of the lithium battery, the electrical card material component is powered on, and the real-time temperature of the battery core of the lithium battery is monitored;
according to the embodiment of the disclosure, the temperature of the battery core of the lithium battery can be monitored through the battery protection circuit with the temperature detection function control.
In step S12, when the real-time temperature of the battery cell reaches the set temperature, the electric card material component is controlled to be powered off.
According to the embodiment of the disclosure, when the real-time temperature of the battery core reaches the set temperature, the power-off of the material part of the electric card can be controlled through the battery protection circuit. In the charging process of the lithium battery 100, the temperature change of the electrical card material part is controlled by controlling the power on and off of the electrical card material part 30. That is, the temperature of the electric card material part is raised to raise the temperature of the battery core 20, so as to increase the charging speed of the lithium battery 100, and further improve the charging efficiency; the electric card material part cools to absorb the heat of the battery core, assists the battery core to cool, avoids the long-time high temperature state of the battery core from influencing the performance and the service life of the lithium battery, and ensures the safety. In the embodiment of the present disclosure, the set temperature may be 30-40 ℃.
Fig. 10 is a flowchart illustrating a temperature control method of a lithium battery according to another exemplary embodiment. In an embodiment, as shown in fig. 10, the method further includes S13 and S14.
In step S13, charging the battery cell with a first charging current;
in step S14, when the real-time temperature of the battery cell reaches the set temperature, the battery cell is charged with a second charging current, where the second charging current is smaller than the first charging current. In the lithium battery charging process, the first charging current is used for charging, and after the set temperature is reached, the second charging current smaller than the first charging current is used for continuing charging, so that the temperature of the lithium battery rises stably, the performance and the service life of the lithium battery are further protected, and the safety is ensured.
With regard to the method in the above-described embodiment, the specific components and embodiments of the respective constituent components of the lithium battery have been described in detail in the embodiment related to the lithium battery, and will not be explained in detail herein. It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.
It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (14)

1. A lithium battery, comprising:
electric core, electricity card material part, wherein:
the electrical card material component is disposed within the electrical core for regulating a temperature of the electrical core during a charging process.
2. The lithium battery of claim 1,
the lithium battery also comprises a protection circuit which is electrically connected with the electric card material component and the battery core;
and when the temperature of the battery core reaches a set temperature, the protection circuit controls the power-off of the electric card material component.
3. The lithium battery of claim 1,
the electric card material component is arranged at the center of the thickness direction of the battery core.
4. A lithium battery according to claim 2,
the battery cell comprises at least one positive electrode layer, at least one isolation layer and at least one negative electrode layer;
the positive electrode layer, the isolation layer and the negative electrode layer are sequentially overlapped and wound outside the electric card material component.
5. A lithium battery according to claim 4,
the lithium battery also comprises a shell for accommodating the battery core;
the positive pole layer and the negative pole layer are respectively led out to the outside of the shell to form a positive pole lug and a negative pole lug, and the positive pole lug and the negative pole lug are respectively electrically connected with the protection circuit.
6. A lithium battery according to claim 4,
the electric card material part is led out to the outside of the shell to form a connecting lug, and the connecting lug is electrically connected with the protection circuit.
7. A lithium battery according to claim 6,
the surface of the connecting lug is provided with an insulating layer.
8. The lithium battery of claim 1,
the battery core comprises more than two superposed battery core groups, and each battery core group comprises a positive electrode layer, a diaphragm layer and a negative electrode layer which are sequentially and alternately stacked;
the electric card material part is arranged between the two stacked electric core groups.
9. The lithium battery of claim 1,
the electric card material part is made of ceramic electric card material and is packaged by a packaging body; or
The electrocaloric material components are made of a polymer type electrocaloric material.
10. The lithium battery of claim 1,
the electrocaloric material components are in the form of sheets.
11. A lithium battery according to claim 2,
the set temperature is 30-40 ℃.
12. A mobile terminal, comprising:
the terminal comprises a terminal body, wherein a battery cavity is arranged on the terminal body;
a lithium battery as claimed in any one of claims 1 to 11 disposed within the battery cavity.
13. A method of temperature control for a lithium battery, the lithium battery comprising an electrocaloric material component, the method comprising:
in the charging process of the lithium battery, electrifying the electric card material component, and monitoring the real-time temperature of the electric core of the lithium battery;
and when the real-time temperature of the battery core reaches a set temperature, controlling the electric card material component to be powered off.
14. The method of claim 13, further comprising:
charging the battery cell with a first charging current;
and when the real-time temperature of the battery cell reaches a set temperature, charging the battery cell by using a second charging current, wherein the second charging current is smaller than the first charging current.
CN202010131553.6A 2020-02-28 2020-02-28 Lithium battery, mobile terminal and temperature control method of lithium battery Pending CN113328154A (en)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
CN102522609A (en) * 2012-01-11 2012-06-27 东莞市钜大电子有限公司 Lithium-ion battery heat insulation device and control method thereof
CN105514521A (en) * 2015-12-07 2016-04-20 湖南立方新能源科技有限责任公司 Lithium ion battery with temperature regulation function
CN105571195A (en) * 2014-09-18 2016-05-11 新生技术有限公司 Cooling device utilizing the polymer composite materials possessing high electrocaloric effect and high elastic modulus
CN106642798A (en) * 2016-11-18 2017-05-10 南方科技大学 Refrigerating system
CN106784291A (en) * 2016-11-18 2017-05-31 南方科技大学 Refrigeration device and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102522609A (en) * 2012-01-11 2012-06-27 东莞市钜大电子有限公司 Lithium-ion battery heat insulation device and control method thereof
CN105571195A (en) * 2014-09-18 2016-05-11 新生技术有限公司 Cooling device utilizing the polymer composite materials possessing high electrocaloric effect and high elastic modulus
CN105514521A (en) * 2015-12-07 2016-04-20 湖南立方新能源科技有限责任公司 Lithium ion battery with temperature regulation function
CN106642798A (en) * 2016-11-18 2017-05-10 南方科技大学 Refrigerating system
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