WO2022111126A1 - Ensemble batterie et son procédé de chauffage, et dispositif électronique - Google Patents

Ensemble batterie et son procédé de chauffage, et dispositif électronique Download PDF

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Publication number
WO2022111126A1
WO2022111126A1 PCT/CN2021/124420 CN2021124420W WO2022111126A1 WO 2022111126 A1 WO2022111126 A1 WO 2022111126A1 CN 2021124420 W CN2021124420 W CN 2021124420W WO 2022111126 A1 WO2022111126 A1 WO 2022111126A1
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WO
WIPO (PCT)
Prior art keywords
heating
layer
battery assembly
switch
temperature
Prior art date
Application number
PCT/CN2021/124420
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English (en)
Chinese (zh)
Inventor
谢红斌
陈伟
Original Assignee
Oppo广东移动通信有限公司
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Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Publication of WO2022111126A1 publication Critical patent/WO2022111126A1/fr

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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
    • H01M10/486—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
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • 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
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • 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

Definitions

  • the present application relates to the field of electronic technology, and in particular, to a battery assembly, a heating method thereof, and an electronic device.
  • the charging rate of the battery is affected by the battery temperature to a certain extent. For example, the charging efficiency of the battery at low temperature is low. Moreover, with the pursuit of light and thin electronic devices, how to reduce the overall volume of electronic devices is also the research focus of technicians. . Therefore, how to improve the charging rate of the battery and reduce the overall volume of the electronic device has become a technical problem to be solved.
  • the present application provides a battery assembly, a heating method thereof, and an electronic device, which improve the charging rate of the battery assembly and reduce the overall volume of the electronic device.
  • a battery assembly provided by an embodiment of the present application includes: a battery core assembly, including a battery core body and a first tab and a second tab electrically connected to the battery core body; and a package, covering On the outer peripheral surface of the cell assembly, the package includes a first heating layer, a first conductive terminal and a second conductive terminal electrically connected to the first heating layer, and the first heating layer is used for The main body of the cell is heated, one end of the first conductive terminal away from the first heating layer is used for connecting to the first tab, and one end of the second conductive terminal away from the first heating layer is used for connecting the second pole.
  • an electronic device provided by an embodiment of the present application includes the battery assembly described above.
  • an embodiment of the present application provides a method for heating a battery assembly, the battery assembly includes a cell assembly, a package, a temperature sensor, and a controller, and the package is wrapped around the outer periphery of the cell assembly surface, the package includes a first heating layer; the temperature sensor is used to detect the temperature of the battery core body; the method includes:
  • a target heating mode is determined in the first heating mode, the second heating mode and the third heating mode, and the first heating layer is controlled to be heated in the target heating mode;
  • the first heating mode is from low temperature
  • the second heating mode is to heat from the low temperature range to the high rate temperature
  • the third heating mode is to heat from the fast charge temperature range to the high rate temperature range, wherein the The minimum temperature value is greater than the maximum temperature value of the low temperature interval; the minimum temperature value of the high rate temperature interval is greater than the maximum temperature value of the fast charging temperature interval.
  • FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • Fig. 2 is a schematic exploded view of the structure of the electronic device provided in Fig. 1;
  • Fig. 3 is a perspective structural schematic diagram of a battery assembly provided in Fig. 1;
  • FIG. 4 is a schematic cross-sectional structure diagram of a battery assembly provided in FIG. 1;
  • FIG. 5 is a schematic diagram of the circuit structure of the battery assembly provided in FIG. 4;
  • FIG. 6 is a schematic diagram of the circuit structure of the battery assembly provided in FIG. 5 under a first heating mode
  • FIG. 7 is a schematic diagram of the circuit structure of the battery assembly provided in FIG. 5 in a charging mode
  • FIG. 8 is a schematic diagram of the circuit structure of the battery assembly provided in FIG. 5 under a second heating mode
  • FIG. 9 is a partial cross-sectional structural schematic diagram of another package provided in FIG. 3;
  • FIG. 10 is a schematic diagram of the circuit structure of the package provided in FIG. 9;
  • FIG. 11 is a schematic structural diagram of the circuit structure of the package provided in FIG. 10 under a heating state
  • FIG. 12 is a schematic cross-sectional structure diagram of another battery assembly provided in FIG. 3;
  • FIG. 13 is a schematic diagram of the circuit structure of the first heating layer and the third heating layer of the battery assembly provided in FIG. 12;
  • FIG. 14 is a schematic diagram of the circuit structure of the first heating layer, the second heating layer and the third heating layer of the battery assembly provided in FIG. 12;
  • FIG. 15 is a schematic structural diagram of the circuit structure of the battery assembly provided in FIG. 14 under the first heating state
  • FIG. 16 is a schematic structural diagram of the circuit structure of the battery assembly provided in FIG. 14 under a second heating state
  • FIG. 17 is a schematic structural diagram of the circuit structure of the battery assembly provided in FIG. 14 under a third heating state
  • FIG. 19 is a graph of a cell assembly with a capacity of 5mAh charged at 0.7C at room temperature of 25°C and charged at a rate of 1.5C after being heated to 50°C.
  • FIG. 1 is a schematic structural diagram of an electronic device 100 according to an embodiment of the present application.
  • the electronic device 100 may be a rechargeable device such as a telephone, a television, a tablet computer, a mobile phone, a camera, a personal computer, a notebook computer, a wearable device, an electric vehicle, an airplane, and the like.
  • the present application takes the electronic device 100 as a mobile phone as an example for description.
  • Those skilled in the art can easily conceive of structural design of other rechargeable devices according to the technical means of this embodiment to improve charging efficiency.
  • the electronic device 100 provided by the present application includes a battery assembly 10 .
  • the electronic device 100 is a mobile phone.
  • the electronic device 100 further includes a display screen 20 , a middle frame 30 and a back cover 40 .
  • the display screen 20 , the middle frame 30 and the back cover 40 are fixedly connected in sequence.
  • the battery assembly 10 is provided on the middle frame 30 .
  • the battery assembly 10 is used to supply power to the display screen 20 and the mainboard disposed on the middle frame 30 and other devices.
  • the battery assembly 10 includes, but is not limited to, lithium ion batteries, lithium metal batteries, lithium-polymer batteries, lead-acid batteries, nickel-metal hydride batteries, nickel-manganese-cobalt batteries, lithium-sulfur batteries, lithium-air batteries , Ni-MH batteries, lithium-ion batteries, iron batteries, nano batteries and all solid-state batteries.
  • the embodiment of the present application is described by taking the battery assembly 10 as an example of a lithium-ion battery. Those skilled in the art can easily conceive of structural designs for other types of batteries according to the technical means of this embodiment.
  • the present application does not specifically limit the shape of the battery assembly 10 .
  • the battery assembly 10 can be in the form of a column, a bag, an arc, a soft-packed square, a cylinder, a diamond column, a special shape, or the like.
  • the battery assembly 10 includes a cell assembly 1 , a first electrode terminal 60 and a second electrode terminal 70 electrically connected to the cell assembly 1 .
  • the first electrode terminal 60 is a positive electrode
  • the second electrode terminal 70 is a negative electrode; or, the first electrode terminal 60 is a negative electrode, and the second electrode terminal 70 is a positive electrode.
  • the first electrode terminal 60 and the second electrode terminal 70 are used for inputting a charging current for charging the cell assembly 1 and outputting a discharging current for the cell assembly 1 .
  • the first electrode terminal 60 and the second electrode terminal 70 can be arranged in the flexible circuit board, and are electrically connected to the battery docking interface on the main board through the lead interface of the flexible circuit board, and then electrically connected to the battery docking interface on the middle frame 30 .
  • the USB charging interface 50 (refer to FIG. 2 ) or discharges devices within the electronic device 100 .
  • the first electrode end 60 and the second electrode end 70 are arranged on the surface of the outer shell of the battery core assembly 1 at intervals and exist in a bare form.
  • the positive and negative terminals of the electronic device 100 are electrically connected to the USB charging interface 50 (refer to FIG. 2 ) on the middle frame 30 or to discharge the devices in the electronic device 100 .
  • the cell assembly 1 includes a cell body 11 , a first tab 12 , a second tab 13 , a protection circuit 14 (also referred to as a management circuit), and a package 15 .
  • the cell main body 11 includes a first pole piece 111 , a second pole piece 112 , a diaphragm 113 and an electrolyte 114 .
  • the first pole piece 111 is a positive pole piece, and the second pole piece 112 is a negative pole piece; or, the first pole piece 111 is a negative pole piece, and the second pole piece 112 is a positive pole piece.
  • the first pole piece 111 is a positive pole piece, and the second pole piece 112 is a negative pole piece.
  • the first pole piece 111 includes a positive electrode current collector and a positive electrode material disposed on the positive electrode current collector.
  • the positive electrode current collector is an aluminum foil with a thickness of 10-20 microns.
  • Cathode materials include layered or spinel-structured transition metal oxides or polyanionic compounds with high electrode potential and stable structure, such as lithium cobaltate, lithium manganate, lithium iron phosphate, and ternary materials. Wait.
  • the positive electrode material also includes carbon black and a binder.
  • the binder may be polyvinylidene fluoride (PVDF).
  • PVDF polyvinylidene fluoride
  • the diaphragm 113 is disposed between the first pole piece 111 and the second pole piece 112 to prevent the first pole piece 111 and the second pole piece 112 from directly contacting each other.
  • the separator 113 is a specially shaped polymer film.
  • the separator 113 has a microporous structure, which allows lithium ions to pass freely, but electrons cannot.
  • the material of the diaphragm 113 includes, but is not limited to, polyethylene (PE), polypropylene (PP) or their composite films.
  • the composite membrane is, for example, a PP/PE/PP three-layer membrane 113 .
  • the electrolyte 114 is disposed between the first pole piece 111 and the second pole piece 112 , so that the first pole piece 111 consumes electrons and the second pole piece 112 generates electrons.
  • the cell body 11 can form a laminated cell, that is, a first pole piece 111 , a diaphragm 113 , a second pole piece 112 , a diaphragm 113 , a first pole piece
  • the sheet 111 , the diaphragm 113 , the second pole piece 112 . . . are arranged in sequence, and a wound cell can also be formed.
  • the first tab 12 is a positive tab, and the first tab 12 is electrically connected to the first pole piece 111 .
  • the connection methods include, but are not limited to, integral molding, welding, and conductive adhesive bonding.
  • the second tab 13 is a negative tab, and the second tab 13 is electrically connected to the second pole piece 112 .
  • the connection methods include, but are not limited to, integral molding, welding, and conductive adhesive bonding.
  • the terminal 70 or the second electrode terminal 70 forming the battery assembly 10 The terminal 70 or the second electrode terminal 70 forming the battery assembly 10 .
  • the first tab 12 is electrically connected to the first electrode terminal 60 of the battery assembly 10
  • the second tab 13 is electrically connected to the second electrode terminal 70 of the battery assembly 10 .
  • the package 15 covers the outer peripheral surface of the cell assembly 1 .
  • the package 15 is a structure for encapsulating the first pole piece 111 , the second pole piece 112 , the separator 113 and the electrolyte 114 . It can be understood that the package 15 includes, but is not limited to, a deformable structure or a non-deformable structure.
  • the initial substrate of the package 15 is a sheet structure.
  • the package 15 can be deformed to form a receiving groove during stamping, and the first pole piece 111 , the second pole piece 112 , and the diaphragm 113 can be arranged in the receiving groove, and then the package 15 can be wrapped on the outer peripheral surface of the cell body 11 , Press the package 15 and the cell main body 11 to seal the edge of the package 15 , so that the package 15 tightly wraps the cell main body 11 and reduces the packaging volume of the battery assembly 10 .
  • the package 15 includes a first heating layer 151 , a first conductive terminal 152 and a second conductive terminal 153 electrically connected to the first heating layer 151 .
  • the first heating layer 151 is used for heating the cell main body 11 .
  • the first conductive terminal 152 and the second conductive terminal 153 are respectively connected to the two poles of the heating power supply, so that when the heating loop formed by the first conductive terminal 152, the first heating layer 151, and the second conductive terminal 153 has current flowing, the first conductive terminal 152 and the second conductive terminal 153
  • the heating layer 151 generates heat.
  • the first heating layer 151 is disposed in the package 15 and the package 15 covers the outer peripheral surface of the cell assembly 1 , the first heating layer 151 is used to heat the cell assembly 1 .
  • the first heating layer 151 is close to the cell assembly 1 and surrounds the cell assembly 1, so the cell assembly 1 can be uniformly heated, and the heating heat can be quickly Conducted to the cell assembly 1 to improve the heat conduction efficiency.
  • the encapsulation member 15 is a multi-layer structure laminated to form a composite film layer, wherein the multi-layer structure includes at least one layer of the first heating layer 151, and other layer structures will be exemplified in the following.
  • the material of the first heating layer 151 includes, but is not limited to, an electric heating material. That is, the first heating layer 151 is made of conductive material.
  • the electric heating material includes but is not limited to one or more of graphite, nickel, aluminum, copper, stainless steel, positive temperature coefficient heating resistance (Positive Temperature Coefficient, PTC), alloy, etc.; or, the material of the electric heating material includes the above One or more layers of polymer films are compounded outside the material to form a multi-layer composite material.
  • the first heating layer 151 is a structure of the package 15 itself, and may also be a structure added in the package 15 .
  • the package 15 may be a single-layer film layer, and the single-layer film layer is the first heating layer 151 .
  • one end of the first conductive terminal 152 away from the first heating layer 151 is used to connect to the first tab 12
  • one end of the second conductive terminal 153 away from the first heating layer 151 is used to connect to the second tab 13 .
  • one end of the first conductive terminal 152 is electrically connected to the first heating layer 151
  • the other end extends in a direction away from the first heating layer 151 .
  • the other end of the first conductive terminal 152 is electrically connected to the first tab 12 .
  • the specific connection method includes, but is not limited to, the fixed connection between the first conductive terminal 152 and the first tab 12 by welding, thermoforming and the like.
  • the first conductive terminals 152 of the first heating layer 151 may be electrically connected to the first tabs 12 through conductive wires, conductive glue, or the like. In this way, the heating circuit of the first heating layer 151 and the charging circuit of the cell assembly 1 are at least partially reusable, and the area occupied by the heating circuit can be reduced while the first heating layer 151 can heat the cell assembly 1 , reducing the overall volume of the battery assembly 10 .
  • one end of the first tab 12 is disposed in the package 15 and is electrically connected to the first pole piece 111 , and the other end of the first tab 12 extends out of the package 15 and is electrically connected to the battery
  • the first electrode end 60 of the assembly 10 The first conductive terminal 152 is electrically connected to one end of the first tab 12 protruding from the package 15 .
  • the first conductive terminal 152 is electrically connected to the first electrode terminal 60 (please refer to FIG. 3 ).
  • one end of the second tab 13 is disposed in the package 15 and is electrically connected to the second pole piece 112 , and the other end of the second tab 13 extends out of the package 15 and is electrically connected to the battery assembly 10 .
  • the second electrode terminal 70 (please refer to FIG. 3 ).
  • One end of the second conductive terminal 153 away from the first heating layer 151 is used for connecting to the second tab 13 . Since the first heating layer 151 is made of conductive material, when the second tab 13 does not need to be electrically connected to the first heating layer 151 , a configuration can be provided between the second tab 13 and the package 15 or between the second tab 15 and the first heating layer 151 .
  • the positions of the first conductive terminals 152 and the first tabs 12 are opposite or not, and the positions of the second conductive terminals 153 and the second tabs 13 are opposite or not, which are not limited in this application.
  • the first heating layer 151 heats the battery core assembly 1 , so that the temperature inside the battery core body 11 can be rapidly increased, thereby increasing the temperature of the battery core body 11 .
  • the electrochemical reaction speed inside the battery pack 1 increases the charging rate of the battery pack 10.
  • the first heating layer 151 is an improvement to the internal structure of the package 15 without affecting the internal structure of the battery pack 1, so it does not affect the battery pack.
  • the volume of the component 1 and the internal electrochemical reaction have an impact; in addition, the first conductive terminal 152 of the first heating layer 151 is electrically connected to the first tab 12 of the battery core component 1, and the second conductive terminal 153 is far away from the first heating layer.
  • One end of 151 can be electrically connected to the second tab 13 of the cell assembly 1 , so that the heating circuit can be multiplexed with some branches of the charging circuit, so as to improve the integration of electronic circuits and reduce the overall volume of the battery assembly 10 .
  • the battery assembly 10 since the heating layer is located in the battery assembly 10, the battery assembly 10 provided in this embodiment is a self-heating battery.
  • the packaging member 15 is an aluminum-plastic film, which enables the battery assembly 10 to have high oxygen resistance, moisture resistance, and puncture resistance.
  • the aluminum plastic film includes a protective layer 155 , a first adhesive layer (not shown), an aluminum foil (refer to 151 in FIG. 5 ), a second adhesive layer (not shown), and a base layer 156 that are stacked in sequence.
  • the base layer 156 is close to the cell body 11 .
  • the material of the protective layer 155 includes but is not limited to nylon.
  • the protective layer 155 is used to improve the wear resistance of the battery assembly 10 and prevent surface scratches.
  • Aluminum foil is used to reflect heat and shield electromagnetic waves.
  • the base layer 156 has good high temperature resistance, and is used for thermal encapsulation of the aluminum-plastic film and the tabs.
  • the first heating layer 151 is an aluminum foil.
  • the first conductive terminal 152 and the second conductive terminal 153 are two conductive terminals provided on the first heating layer 151 .
  • This embodiment utilizes the ability of the aluminum foil in the aluminum-plastic film to generate heat when energized, and designs the aluminum foil in the aluminum-plastic film as the first heating layer 151 for heating the cell assembly 1, and improves the structure of the aluminum foil by designing two The first conductive terminal 152 and the second conductive terminal 153 are formed respectively; there is no need to additionally set the first heating layer 151, that is, there is no need to make major changes to the hierarchical structure of the aluminum-plastic film, which saves costs and processes, and can also reduce The thickness of the aluminum plastic film.
  • This embodiment makes full use of the aluminum foil in the aluminum-plastic film, so that it not only has the function of reflecting heat and shielding electromagnetic waves, but also has the function of heating the battery core assembly 1 , which increases the function of the battery assembly 10 without additionally increasing the function.
  • the volume of the battery pack 10 promotes miniaturization of the battery pack 10 .
  • the first heating layer 151 may be an additional film layer disposed in the aluminum plastic film.
  • the first heating layer 151 can be disposed on the side of the protective layer 155 away from the base layer 156 , or disposed between the protective layer 155 and the first adhesive layer, or disposed between the first adhesive layer and the aluminum foil, or disposed At least one of between the aluminum foil and the second adhesive layer, or between the second adhesive layer and the base layer 156 , or on the side of the base layer 156 away from the second adhesive layer, etc.
  • the first heating layer 151 may also be embedded in at least one of the protective layer 155 , the first adhesive layer, the aluminum foil, the second adhesive layer, and the base layer 156 . It can be understood that the number of the first heating layers 151 may be one or more.
  • the battery assembly 10 further includes a first switch 161 and a second switch 162 .
  • the first switch 161 is electrically connected between the second electrode terminal 70 and the second tab 13 .
  • the second switch 162 is electrically connected between the second electrode terminal 70 and the second conductive terminal 153 .
  • the second tab 13 and the second conductive terminal 153 pass through the first switch 161 and the second switch 162 respectively and then merge and connect to the second electrode terminal 70 .
  • the present application improves the electrical connection relationship between the second tab 13 and the second electrode terminal 70 .
  • a first switch 161 is provided on the second tab 13 and the second electrode terminal 70 , and the first switch 161 controls the conduction of the charging circuit.
  • a second switch 162 is arranged between the second electrode terminal 70 and the second conductive terminal 153, and the second switch 162 is a switch for controlling the conduction and disconnection of the heating circuit, so as to facilitate the subsequent operation of the cell assembly 1 and the heating mode of the first heating layer 151 are controlled.
  • the battery assembly 10 further includes a controller (not shown).
  • the controller is used to control the second switch 162 to be turned on and the first switch 161 to be turned off in the heating mode; and to control the first switch 161 to be turned on and the second switch 162 to be turned off in the charging mode.
  • the controller is also used to control both the first switch 161 and the second switch 162 to be turned on in the heating charging mode.
  • the heating mode is a mode in which the controller controls the heating of the first heating layer 151 .
  • the heating mode includes a first heating mode and a second heating mode, wherein the first heating mode is that the external power supply supplies power to the first heating layer 151 , and the second heating mode is that the cell assembly 1 supplies power to the first heating layer 151 . 151 powered.
  • the charging mode is a mode in which the controller controls the charging of the battery cell assembly 1 .
  • the heating and charging mode is a mode in which the first heating layer 151 is heated while the cell assembly 1 is being charged.
  • the controller can be disposed on the protection board and electrically connected to the charging protection circuit 14 .
  • the first heating layer 151 is electrically connected to an external power source through a charging interface, and the controller controls the second switch 162 to be turned on and the first switch 161 to be turned off in the first heating mode On, at this time, the first heating layer 151 heats the cell assembly 1, and the cell assembly 1 is not charged.
  • This application situation can be used in the case of extremely low temperature, the reaction rate of the electrochemical reaction inside the battery cell assembly 1 is low at extremely low temperature, so that the battery assembly 10 cannot be charged at a normal fast charging rate. In this way, the electronic device 100 can be connected to When the power is turned on, the controller controls the first heating layer 151 to heat the battery cell assembly 1 , so that the battery assembly 10 enters a self-heating heating mode.
  • the second switch 162 can be controlled to be turned on, so that the cell assembly 1 starts to be charged.
  • the temperature of the component 1 has reached the fast charging temperature range, so the battery core component 1 can be charged at the fast charging rate at this time.
  • the second switch 162 can be controlled to turn off, and the first heating layer 151 stops heating the battery core component 1. to put the battery pack 10 into charging mode. Or, continue to heat the battery cell assembly 1, so that the battery assembly 10 enters the charging heating mode.
  • the cell assembly 1 since the temperature of the cell assembly 1 is already in the fast charging temperature range, when charging at the fast charging rate, the cell assembly 1 will also generate a certain amount of heat while charging, so that the cell assembly 1 is kept in the fast charging temperature range. It is charged at the fast charging rate, and the cell assembly 1 can be quickly charged to saturation, so the controller can control the first heating layer 151 to be heated to the fast charging temperature range to stop heating the cell assembly 1 to save power.
  • the charging rate of the cell assembly 1 is related to the temperature
  • the first heating layer 151 can be controlled to continue to charge the electricity while the cell assembly 1 is being charged.
  • the core assembly 1 is heated, so that the battery core assembly 1 is charged at a high charging rate (eg, the high charging rate exceeds the rated charging rate), thereby further increasing the charging rate of the battery assembly 10 .
  • the controller controls the disconnection and conduction of the first switch 161 and the second switch 162 to control the heating of the cell assembly 1 by the first heating layer 151 and the charging of the cell assembly 1 so as to make the cell assembly 1 Perform fast charging rate charging or high rate charging in a suitable temperature range to improve the charging speed of the battery cell assembly 1 .
  • the battery assembly 10 further includes an isolation circuit 170 .
  • the isolation circuit 170 is electrically connected between the second electrode terminal 70 and the second conductive terminal 153 .
  • the isolation circuit 170 is used to isolate the cell assembly 1 from the first heating layer 151 in the heating charging mode.
  • the isolation circuit 170 is used to isolate the current of the cell assembly 1 from the current of the first heating layer 151 in the heating and charging mode, so as to form an independent parallel connection between the cell assembly 1 and the first heating layer 151 branch.
  • the isolation circuit 170 includes at least one isolation resistor 171 and a third switch 163 .
  • the isolation circuit 170 includes one isolation resistor 171, or a combination of multiple isolation resistors 171, or a combination of the isolation resistor 171 and other isolation devices, and so on.
  • the number of the third switches 163 may be one or more, which is not limited herein.
  • the number of the isolation resistor 171 and the number of the third switch 163 are all one for illustration.
  • One end of the isolation resistor 171 is electrically connected to the second electrode terminal 70 .
  • the other end of the isolation resistor 171 is electrically connected to one end of the third switch 163 .
  • the other end of the third switch 163 is electrically connected to the second conductive terminal 153 .
  • the controller is used to control the second switch 162 to be turned on or the third switch 163 to be turned on in the heating mode.
  • the controller can control the second switch 162 to be turned on and the third switch 163 to be turned off in the first heating mode, At this time, the first heating layer 151 is connected to the external power supply.
  • the controller can control the third switch 163 to be turned on and the second switch 162 to be turned on in the second heating mode
  • the first switch 161 is turned on; at this time, the first tab 12 is electrically connected to the first conductive terminal 152, and the second tab 13 is electrically connected to the second conductive terminal 153.
  • the heating layer 151 supplies power, and the first heating layer 151 heats the cell assembly 1 .
  • This embodiment can be applied to a low temperature scenario, where the cell assembly 1 preheats the cell assembly 1 when the external power supply is turned on, so that the cell assembly 1 is in the fast charging temperature range when the external power supply is turned on, so , the battery cell assembly 1 can be charged quickly.
  • This embodiment can also be used when the discharge rate of the cell assembly 1 is unstable at a low temperature.
  • the cell assembly 1 supplies power to the first heating layer 151, and the first heating layer 151 heats the cell assembly 1, so as to improve the performance of the cell assembly. 1 for the stability of the discharge rate.
  • the battery assembly 10 further includes a temperature sensor (not shown).
  • the temperature sensor is provided in the package 15 . This application does not specifically limit the specific location of the temperature sensor.
  • the temperature sensor can be arranged on the protection board or inside the main body 11 of the battery cell.
  • the temperature sensor is electrically connected to the controller, and the controller is configured to control the first heating layer 151 to enter the heating mode according to the temperature detection value of the temperature sensor.
  • the temperature sensor is used to detect the temperature of the main body 11 of the battery cell, and convert the temperature into an electrical signal and send it to the controller.
  • the controller receives the temperature of the temperature sensor to monitor the temperature of the battery cell body 11 in real time, so as to control the first heating when the temperature of the battery cell body 11 is lower than the fast charging interval before or during the charging process.
  • the layer 151 heats the cell assembly 1 ; it is also convenient to stop the first heating layer 151 from heating the cell assembly 1 when the first heating layer 151 heats the cell assembly 1 to a higher temperature.
  • the package 15 further includes a second heating layer 158 .
  • the second heating layer 158 is disposed in the protective layer 155; alternatively, the second heating layer 158 is disposed between the protective layer 155 and the first adhesive layer; alternatively, the second heating layer 158 is disposed between the base layer 156 and the second adhesive layer time; or.
  • the second heating layer 158 is disposed in the base layer 156; alternatively, the second heating layer 158 is disposed on the side of the protective layer 155 away from the first adhesive layer; alternatively, the second heating layer 158 is disposed in the base layer 156 away from the second adhesive layer side.
  • the material of the second heating layer 158 includes, but is not limited to, one or more of graphite, nickel, aluminum, copper, stainless steel, positive temperature coefficient heating resistor (Positive Temperature Coefficient, PTC), alloy, etc.; or, an electric heating material
  • the material includes the above-mentioned materials and one or more layers of polymer films are compounded to form a multi-layer composite material.
  • the shape of the second heating layer 158 includes, but is not limited to, a heating wire, a heating sheet, and the like.
  • the shape of the second heating layer 158 may be a wire shape, a mesh shape, a line shape, or the like. Since the shielding performance of the first heating layer 151 needs to be considered, the material and shape of the first heating layer 151 are limited to a certain extent, so that the heating efficiency of the first heating layer 151 is affected to a certain extent. In this embodiment, by disposing the second heating layer 158 , the material of the second heating layer 158 can be set to a material with higher electrical heat generation efficiency, and the shape of the second heating layer 158 is designed so that the second heating layer 158 can be effectively The heating resistance value in the area of ?
  • the second heating layer 158 may cover part or all of the outer peripheral surface of the cell assembly 1 .
  • the package 15 further includes a third conductive terminal 158 a and a fourth conductive terminal 158 b electrically connected to the second heating layer 158 .
  • the third conductive terminal 158a is electrically connected to the second conductive terminal 153 .
  • the battery assembly 10 also includes a fourth switch 164 .
  • the fourth switch 164 is electrically connected between the second electrode terminal 70 and the fourth conductive terminal 158b.
  • the second switch 162 is connected between the end of the fourth switch 164 that is not connected to the fourth conductive terminal 158b and the third conductive terminal 158a.
  • the positions of the third conductive terminal 158a and the second conductive terminal 153 are opposite or not opposite, and the positions of the fourth conductive terminal 158b and the second electrode end 70 are opposite or not opposite, which are not limited in this application.
  • the controller controls the second switch 162 to be turned off and the fourth switch 164 to be turned on.
  • the first heating layer 151 and the second heating layer 158 are connected in series, thus increasing the heating resistance of the package 15 and improving the packaging
  • the heating efficiency of the package 15 under a smaller current is improved, and the heating efficiency of the package 15 is improved by heating to a higher temperature faster under a smaller current.
  • the controller controls the second switch 162 to be turned on and the fourth switch 164 to be turned off. At this time, the first heating layer 151 heats the cell assembly 1 , which is applicable to relatively low heating speed scene.
  • the controller controls the second switch 162 to be turned off and the fourth switch 164 to be turned on, so that the heating efficiency of the package 15 is high, and the temperature of the cell assembly 1 is lower than The extremely fast rate rises to the fast charging temperature range.
  • the controller can control the second switch 162 to be turned on and the fourth switch 164 to be turned off, so that the heating efficiency of the package 15 is improved. It is relatively slow, so that the temperature of the battery cell assembly 1 is maintained in the fast charging temperature range.
  • the battery assembly 10 further includes a peelable sticker 18 .
  • the easy-to-peel sticker 18 includes a base film 181 , a third heating layer 182 disposed in the base film 181 , and a third adhesive layer (not shown) disposed on the surface of the base film 181 .
  • the third adhesive layer adheres the outer surface of the package 15 .
  • the easy-tear sticker 18 is a pull-up sticker on the battery assembly 10 to facilitate taking out the battery assembly 10 from the battery compartment.
  • the easy peeling sticker 18 is attached to the outer peripheral surface of the battery assembly 10 .
  • a third heating layer 182 is embedded in the base film 181 of the easily peelable sticker 18 designed in the present application.
  • the material of the third heating layer 182 includes, but is not limited to, one or more of graphite, nickel, aluminum, copper, stainless steel, positive temperature coefficient heating resistor (Positive Temperature Coefficient, PTC), alloy, etc.; or, an electric heating material
  • the material includes the above-mentioned materials and one or more layers of polymer films are compounded to form a multi-layer composite material.
  • the shape of the third heating layer 182 includes, but is not limited to, a heating wire, a heating sheet, and the like.
  • the shape of the third heating layer 182 is a heating wire, so that the film thickness of the easy-to-remove sticker 18 is small and can be well attached to the surface of the battery assembly 10.
  • the third heating layer 182 may be disposed on all or part of the outer peripheral surface of the battery assembly 10 .
  • the function of the easy peeling sticker 18 is increased, the utilization rate of the easy peeling sticker 18 is improved, the third heating layer 182 is added, and the heating efficiency of the battery assembly 10 is improved. space-saving.
  • the third heating layer 182 includes a fifth conductive terminal 182 a , a sixth conductive terminal 182 b and a fifth switch 165 .
  • One end of the fifth conductive terminal 182 a is electrically connected to the first tab 12 or the first electrode terminal 60 .
  • the fifth switch 165 is electrically connected between the sixth conductive terminal 182b and the second electrode terminal 70 .
  • the controller can control the second switch 162 to be turned off, the fourth switch 164 to be turned off, and the fifth switch 165 to be turned on, so that the third heating layer 182 can heat the cell assembly 1 alone.
  • This embodiment can be used in a scenario that requires relatively low heating rate of the cell assembly 1 .
  • the easy-to-remove sticker 18 may be separated from the main body 11 of the battery cell, the third heating layer 182 of the easy-to-peel sticker 18 and the first heating layer 151 and the second heating layer 158 of the aluminum-plastic film are connected in parallel. After the easy-tear sticker 18 is separated from the main body 11 of the battery cell, the heating circuit of the aluminum-plastic film is not affected.
  • the third heating layer 182 may be electrically connected to the first heating layer 151 through conductive vias.
  • the fifth conductive terminal 182a is electrically connected to the first heating layer 151 through the conductive through hole
  • the sixth conductive terminal 182b is electrically connected to the second electrode terminal 70 through the fifth switch 165 .
  • the battery assembly 10 includes a first heating layer 151 , a second heating layer 158 , and a third heating layer 182 .
  • the controller controls the second switch 162 to be turned off, the fourth switch 164 to be turned on, and the fifth switch 165 to be turned off.
  • the first heating layer 151 and the second heating layer 158 are connected in series , the heating resistance is relatively large, and the first heating layer 151 and the second heating layer 158 can be controlled to rapidly heat the cell assembly 1, and the temperature of the cell assembly 1 can be rapidly increased to the fast charging temperature range, so that the battery assembly 10 can be quickly Charge.
  • the controller controls the fourth switch 164 to be turned off, the second switch 162 to be turned on, and the fifth switch 165 to be turned off.
  • the first heating layer 151 heats the cell assembly 1.
  • the heating rate at this stage is relatively slow, so that the cell assembly 1 is maintained in the fast charging temperature range, so as to facilitate The battery pack 10 is capable of maintaining rapid charging.
  • the controller controls the second switch 162 to be turned off, the fourth switch 164 to be turned off, and the fifth switch 165 to be turned on, so that the third heating layer 182 can
  • the cell assembly 1 is heated, so that the temperature of the cell assembly 1 can be controlled to keep warm or slowly heat, so that the battery assembly 10 can maintain fast charging.
  • the above controller can select the size of the heating resistor by controlling the second switch 162, the fourth switch 164, and the fifth switch 165, and adjust the heating resistance value to select different heating resistance values in different heating temperature ranges to form different heating rates , the battery cell assembly 1 can be controlled to rapidly increase to the fast charging temperature, and the temperature after reaching the fast charging temperature is not increased too fast, and is maintained at the fast charging temperature, so that the battery cell assembly 1 has a faster charging rate .
  • the battery assembly 10 can be covered with a heating film, and the heating film is an ultra-thin film with built-in heating elements, and is then adhered to the outer surface of the battery assembly 10 by means of adhesive.
  • the heating element is an electric heating element.
  • the film thickness of the heating film is less than 0.1 mm.
  • One conductive terminal of the heating film is electrically connected to the first tab 12 of the battery assembly 10 , and the other conductive terminal of the heating film is connected to the switch and then merged with the second tab 13 of the battery assembly 10 .
  • the embodiment of the present application further provides a method for heating the battery assembly 10 .
  • This heating method can be used for the battery assembly 10 described in any one of the above embodiments.
  • the heating method includes the following steps.
  • the 120 Determine a target heating mode in the first heating mode, the second heating mode and the third heating mode according to the detected temperature, and control the first heating layer 151 to be heated in the target heating mode; the first heating mode is heating from a low temperature range to The fast charging temperature range; the second heating mode is heating from the low temperature range to the high rate temperature; the third heating mode is heating from the fast charging temperature range to the high rate temperature range.
  • the minimum temperature value of the fast charging temperature interval is greater than the maximum temperature value of the low temperature interval; the minimum temperature value of the high rate temperature interval is greater than the maximum temperature value of the fast charging temperature interval.
  • the low temperature range is less than 10°C.
  • the fast charging temperature range is 10 to 45°C, excluding 10°C and including 45°C;
  • the high rate temperature range is 45°C to 60°C, excluding 45°C and including 60°C.
  • the charging rate of the cell assembly 1 in the low temperature range is less than the rated fast charging rate
  • the charging rate of the cell assembly 1 in the fast charging temperature range is the rated fast charging rate
  • the charging rate of the cell assembly 1 in the high rate temperature is greater than the rated fast charging rate.
  • the detection result is yes, it is determined that the first heating mode or the second heating mode is the target heating mode.
  • the controller determines the target heating mode to be the first heating mode or the second heating mode.
  • the controller controls the first heating layer 151 to connect to an external power source, so that the first heating layer 151 heats the cell assembly 1 to a temperature that rises to the fast charging temperature range, and then controls the first heating layer 151 to stop heating the cell assembly. 1 Heating or heating the cell assembly 1 at a slow speed.
  • the controller controls the first heating layer 151 and the second heating layer 158 to heat the battery core assembly 1 to a temperature After rising to the fast charging temperature range, the third heating layer 182 is controlled to heat the cell assembly 1 independently.
  • the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 until the temperature rises to the fast charging temperature range, and then controls the first heating layer 151 to heat the cell assembly 1 alone.
  • the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 until the temperature rises to the fast charging temperature range and then controls the first heating layer 151 and the third heating layer 182 to heat the cell assembly 1 .
  • the controller controls the first heating layer 151 to heat the cell assembly 1 until the temperature rises to a high rate temperature range, and then controls the first heating layer 151 to stop heating the cell assembly 1 or heat the cell assembly 1 at a slow speed. .
  • the controller controls the first heating layer 151 and the second heating layer 158 to heat the battery core assembly 1 to a temperature After rising to the high-rate temperature range, the third heating layer 182 is controlled to heat the cell assembly 1 independently.
  • the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 until the temperature rises to a high rate temperature range, and then controls the first heating layer 151 to heat the cell assembly 1 alone.
  • the controller controls the first heating layer 151 and the second heating layer 158 to heat the cell assembly 1 until the temperature rises to a high rate temperature range and then controls the first heating layer 151 and the third heating layer 182 to heat the cell assembly 1 .
  • the detection result is no, it is detected whether the detected temperature is less than or equal to the minimum value of the high-rate temperature range, and if the detection result is yes, it is determined that the third heating mode is the target heating mode.
  • the controller controls the first heating layer 151 to turn on the external power source, so that the first heating layer 151 heats the battery core assembly 1 until the temperature rises to a higher temperature range , and then let the battery cell assembly 1 be charged.
  • the battery cell assembly 1 can be charged at a larger charging rate.
  • the normal fast charge of battery pack 1 is 1.5C at room temperature, and the 3C fast charge mode starts after heating to 50°C; in this mode, the heating temperature cannot exceed the upper limit of the temperature that the battery can store, for example, the battery can be stored at 60°C. , the heating temperature cannot exceed this temperature.
  • FIG. 19 is a graph showing a 0.7C battery cell assembly 11 with a capacity of 5mAh charged at 0.7C at room temperature of 25°C and charged at a rate of 1.5C after heating to 50°C. It can be seen from the figure that the full charge time at room temperature is 155min. After heating, the charging time for increasing the rate is shortened to 88min. It can be seen that the charging speed of the battery can be greatly improved after heating.
  • the present application improves the structure of the battery assembly 10 and improves the heating method of the battery assembly 10 to control the battery assembly 10 to enter a self-heating mode. in this way.
  • the electrochemical reaction rate inside the cell assembly 1 can be awakened at low temperature, and the electrochemical reaction rate inside the cell assembly 1 can be increased at normal charging temperature, both of which can greatly improve the charging rate of the cell assembly 1 .
  • By heating the package 15 of the battery pack 10, the inside of the battery pack 10 is heated to the target charging temperature, and then the battery pack 10 is charged with a corresponding charging current.
  • the charging rate of the battery assembly 10 at low temperature can be improved, and at the same time, the designed rated charging rate of the battery assembly 10 can be exceeded, and the charging rate of the battery assembly 10 can be greatly improved.

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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)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

Selon des modes de réalisation, la présente invention concerne un ensemble batterie et son procédé de chauffage, et un dispositif électronique. L'ensemble batterie comprend un ensemble élément et un boîtier, et l'ensemble élément comprend un corps d'élément, et une première languette et une seconde languette électriquement connectées au corps d'élément. Le boîtier recouvre la surface périphérique de l'ensemble élément, et le boîtier comprend une première couche de chauffage, et une première borne conductrice et une seconde borne conductrice électriquement connectées à la première couche de chauffage. La première couche chauffante est utilisée pour chauffer le corps d'élément. L'extrémité de la première borne conductrice éloignée de la première couche chauffante est connectée à la première languette. L'extrémité de la seconde borne conductrice éloignée de la première couche chauffante est connectée à la seconde languette. La présente invention concerne un ensemble batterie pouvant augmenter le taux de charge de l'ensemble batterie et réduire le volume global du dispositif électronique, un procédé de chauffage pour l'ensemble batterie et un dispositif électronique.
PCT/CN2021/124420 2020-11-30 2021-10-18 Ensemble batterie et son procédé de chauffage, et dispositif électronique WO2022111126A1 (fr)

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CN112510296B (zh) * 2020-11-30 2023-08-11 Oppo广东移动通信有限公司 电池组件及其加热方法、电子设备
CN113178612B (zh) * 2021-04-27 2023-12-15 Oppo广东移动通信有限公司 电池组件及其控制方法和电子设备
CN113690513B (zh) * 2021-08-18 2023-08-29 Oppo广东移动通信有限公司 电池模块及电子设备
CN113782811B (zh) * 2021-09-13 2023-02-28 宁德新能源科技有限公司 用电设备及电化学装置的加热方法

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