WO2023178550A1 - Batterie, procédé de chauffage de batterie et dispositif électronique - Google Patents

Batterie, procédé de chauffage de batterie et dispositif électronique Download PDF

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Publication number
WO2023178550A1
WO2023178550A1 PCT/CN2022/082488 CN2022082488W WO2023178550A1 WO 2023178550 A1 WO2023178550 A1 WO 2023178550A1 CN 2022082488 W CN2022082488 W CN 2022082488W WO 2023178550 A1 WO2023178550 A1 WO 2023178550A1
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WIPO (PCT)
Prior art keywords
switch
battery
heater
electrically connected
controller
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PCT/CN2022/082488
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English (en)
Chinese (zh)
Inventor
郭永林
崔立志
Original Assignee
东莞新能安科技有限公司
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Application filed by 东莞新能安科技有限公司 filed Critical 东莞新能安科技有限公司
Priority to PCT/CN2022/082488 priority Critical patent/WO2023178550A1/fr
Publication of WO2023178550A1 publication Critical patent/WO2023178550A1/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
    • 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

Definitions

  • Embodiments of the present application relate to the field of electrical engineering technology, and in particular, to a battery pack, a battery heating method and an electronic device.
  • Secondary batteries such as lithium-ion batteries, sodium-ion batteries, etc.
  • the ambient temperature is low, the chemical reaction rate of the secondary battery is slow, which affects the normal charging and discharging of the secondary battery.
  • the secondary battery is discharged in a low-temperature environment, it is easy to cause irreversible damage to the performance of the secondary battery. Therefore, it is necessary to provide a technical solution to improve the charge and discharge performance of secondary batteries in low temperature environments.
  • embodiments of the present application provide a battery pack, a battery heating method and an electronic device to improve the charging and discharging performance of secondary batteries in low-temperature environments.
  • a battery pack including: a battery heating circuit, a battery core module and a heater.
  • the battery heating circuit includes a controller and a first switch.
  • the first switch receives The control signal of the controller performs on or off, and the first switch is electrically connected to the battery core module and the heater.
  • the first switch is configured to receive a control signal from the controller to perform conduction in response to the temperature of the battery module being not lower than a temperature threshold, and the battery module, the first switch and the The first circuit where the heater is located is turned on, causing the temperature of the heater to rise to heat the battery core module.
  • the battery core module includes at least one battery core, and the heater includes at least one sub-heater, wherein the sub-heaters correspond to the battery core one-to-one, and each of the sub-heaters includes at least two Metal terminals, the metal terminals are led out from the inside of the battery core.
  • control end of the first switch is electrically connected to the controller for receiving a control signal from the controller.
  • the first end of the first switch is electrically connected to the positive electrode of the battery core module, the second end of the first switch is electrically connected to the first end of the heater, and the second end of the heater is electrically connected to the negative electrode of the battery core module; or, the first end of the heater is electrically connected to the positive electrode of the battery core module, and the second end of the heater is electrically connected to the third terminal of the first switch.
  • the two ends are electrically connected, and the first end of the first switch is electrically connected to the negative electrode of the battery module.
  • the battery heating circuit further includes: a second switch and a charging port.
  • the second switch is electrically connected to the heater and the charging port respectively, and receives a control signal from the controller to execute On or off.
  • the second switch is configured to receive a control signal from the controller to perform conduction in response to the temperature of the battery module being lower than the temperature threshold, and the charging port is configured to be electrically connected to a charger, So that the charger, the second switch and the second circuit where the heater is located are turned on.
  • the control end of the second switch is electrically connected to the controller for receiving a control signal from the controller
  • the charging port includes a first charging port and a second charging port.
  • the first end of the second switch is electrically connected to the first charging port
  • the second end of the second switch is electrically connected to the first end of the heater
  • the second end of the heater is electrically connected to the first charging port.
  • the second charging port is electrically connected; or, the first end of the heater is electrically connected to the first charging port, and the second end of the heater is electrically connected to the second end of the second switch, so The first end of the second switch is electrically connected to the second charging port.
  • the second switch when the first switch receives a control signal from the controller to turn on, the second switch receives a control signal from the controller to turn off; or, when the second switch receives a control signal from the controller, it turns off.
  • the control signal of the controller is turned on, the first switch receives the control signal of the controller and is turned off.
  • the battery heating circuit further includes: a detector, the detector is electrically connected to the battery core module and the controller respectively, and is used to obtain the temperature information of the battery core module, The temperature information is sent to the controller, and the detector is configured to detect the temperature of the battery core module in response to the controller waking up.
  • the controller is configured to wake up in response to a power-on signal entering the working state from the sleep state; or to wake up in response to a charger accessing the charging port and receiving a charging signal.
  • the second switch is configured to receive a control signal from the controller to perform shutdown in response to a voltage of the charger being higher than a first voltage threshold.
  • the battery heating circuit further includes: a first diode.
  • the anode of the first diode is electrically connected to the anode of the battery module, and the cathode of the first diode is electrically connected to the first switch.
  • the battery heating circuit further includes: a second diode.
  • the anode of the second diode is electrically connected to the charging port, and the cathode of the second diode is electrically connected to the second switch.
  • the heater includes more than three sub-heaters, and each of the sub-heaters forms any of the following electrical connection forms: (i) The sub-heaters form a series electrical connection. connection; or, (ii) a parallel electrical connection is formed between the sub-heaters; or, (iii) a mixed electrical connection is formed between the sub-heaters.
  • the battery heating circuit further includes: a third switch and a fourth switch, the third switch and the fourth switch being connected in series.
  • the third switch and the fourth switch are electrically connected between the positive electrode of the battery core module and the positive output terminal of the battery core module; or, the third switch and the fourth switch are electrically connected Connected between the negative electrode of the battery cell module and the negative electrode output terminal of the battery cell module.
  • a battery heating method is provided, which is applied to the battery pack in the first aspect.
  • the battery heating method includes: in response to the temperature of the battery module being not lower than the temperature threshold, The controller sends a control signal to the first switch; the first switch performs conduction in response to the received control signal, and the battery module, the first switch and the first circuit where the heater is located are conductive, causing The temperature of the heater rises to heat the battery core module; or, in response to the temperature of the battery core module being lower than the temperature threshold, the controller sends a control signal to the second switch; The second switch is turned on in response to the received control signal, and the charger, the second switch, and the second circuit in which the heater is located are turned on, causing the temperature of the heater to rise to increase the temperature of the heater.
  • the battery module is heated.
  • an electronic device including the battery pack of the first aspect.
  • the controller when the ambient temperature is low, in response to the temperature of the battery module not being lower than the temperature threshold, the controller can send a control signal to the first switch to turn on the first switch. , after the first switch is turned on, the battery module, the first switch and the first circuit where the heater is located are turned on, and the battery module supplies power to the heater, causing the temperature of the heater to rise to inflate the battery module. Heating is performed so that the battery module can rise to a suitable temperature in a short period of time, thereby improving the charging and discharging performance of the battery module in a low-temperature environment.
  • Figure 1 is a schematic block diagram of a battery pack according to an embodiment of the present application.
  • Figure 2 is a schematic diagram of a battery heating circuit according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a battery heating circuit according to another embodiment of the present application.
  • Figure 4 is a schematic diagram of a battery heating circuit according to another embodiment of the present application.
  • FIG. 5 is a schematic block diagram of a battery pack according to another embodiment of the present application.
  • Figure 6 is a schematic block diagram of a battery pack according to another embodiment of the present application.
  • FIG. 7 is a schematic diagram of a battery core according to an embodiment of the present application.
  • Figure 8 is a schematic diagram of a heating plate according to an embodiment of the present application.
  • Figure 9 is a flow chart of a battery heating method according to an embodiment of the present application.
  • Secondary batteries are rechargeable batteries that rely on metal ions, such as lithium ions and sodium ions, to move between the positive and negative electrodes. They are widely used in consumer electronics, drones, electric vehicles and other products. application.
  • the working principle of the secondary battery is that the internal electrolyte changes through chemical reactions, and a potential difference occurs between the positive and negative electrodes, thereby causing current flow.
  • the movement speed of the electrolyte slows down, which affects the transfer activity of metal ions between the positive and negative electrodes, resulting in a decrease in battery charge and discharge performance.
  • discharge of the secondary battery in a low-temperature environment can easily cause damage to the secondary battery. Therefore, there is an urgent need for a solution to increase the temperature of the secondary battery, to heat the secondary battery in a low-temperature environment, and to improve the charge and discharge performance of the secondary battery in a low-temperature environment.
  • FIG. 1 is a schematic block diagram of a battery pack according to an embodiment of the present application.
  • the battery pack 100 includes a battery heating circuit 10, a battery module 20 and a heater 30.
  • the battery heating circuit 10 includes a controller 11 and a first switch 12.
  • the first switch 12 is a controllable switch that can receive According to the control signal of the controller 11, the circuit is turned on or off.
  • the first switch 12 is electrically connected to the battery module 20 and the heater 30 .
  • the first switch 12 can receive a control signal from the controller 11 to perform conduction, so that the battery module 20 , the first switch 12 and the first switch 12 where the heater 30 is located.
  • the circuit is turned on, thereby increasing the temperature of the heater 30 to heat the battery module 20 .
  • the controller 11 when the ambient temperature is low, in response to the temperature of the battery module 20 not being lower than the temperature threshold, the controller 11 can send a control signal to the first switch 12 to cause the first switch 12 to turn on. , after the first switch 12 is turned on, the battery module 20, the first switch 12 and the first circuit where the heater 30 is located are turned on, and the battery module 20 supplies power to the heater 30, causing the temperature of the heater 30 to rise. , to heat the battery module 20 so that the battery module 20 can rise to a suitable temperature in a short period of time, thereby improving the charging and discharging performance of the battery module 20 in a low-temperature environment.
  • the battery pack 100 may include a battery module, a heater and a battery management system (Battery Management System, BMS), and the battery heating circuit 10 may be provided on the BMS.
  • BMS Battery Management System
  • the BMS is based on a circuit board.
  • the BMS circuit board can manage the charge and discharge of the battery module.
  • the controller 11 can be disposed on the BMS circuit board, and in response to the temperature of the battery module 20 not being lower than the temperature threshold, sending a control signal to the first switch 12 means that the controller can obtain the battery module 20 The temperature information of the battery module 20 or the temperature information of the environment where the battery module 20 is located. When the temperature of the battery module 20 is low enough to affect normal charging and discharging, but the temperature of the battery module 20 is not lower than the temperature threshold, the controller 11 can The first switch 12 sends a control signal to turn on the first switch 12 and the battery module 20 supplies power to the heater 30 so that the heater 30 heats the battery module 20 .
  • the low temperature will It has a greater impact on the charge and discharge performance of the battery module 20.
  • the temperature threshold is -20°C.
  • the battery module 20 can move to the first The switch 12 sends a control signal to cause the first switch 12 to perform conduction.
  • the controller 11 can send a signal to the third battery module 20 .
  • a switch 12 sends the control signal.
  • the BMS circuit board can turn off the discharge of the battery module 20, because if the battery module 20 discharges at a temperature lower than the temperature threshold, it will cause problems for the battery module.
  • the performance of the battery cells included in 20 causes irreversible damage, so after the temperature of the battery module 20 is lower than the temperature threshold (for example -20°C), the controller 11 will not send a control signal to the first switch 12, and the first switch 12 is in the off state, and the battery module 20 no longer supplies power to the heater 30 .
  • the temperature threshold for example -20°C
  • FIGS. 2 to 4 are schematic diagrams of three battery heating circuits provided by embodiments of the present application.
  • the control end of the first switch 12 is electrically connected to the controller 11 , and the first switch 12 receives the control signal of the controller 11 through the control end.
  • the first end of the first switch 12 is electrically connected to the positive electrode of the battery module 20
  • the second end of the first switch 12 is electrically connected to the first end of the heater 30 .
  • the heater 30 The second end is electrically connected to the negative electrode of the battery module 20 .
  • FIG. 1 the control end of the first switch 12 is electrically connected to the controller 11
  • the first switch 12 receives the control signal of the controller 11 through the control end.
  • the first end of the first switch 12 is electrically connected to the positive electrode of the battery module 20
  • the second end of the first switch 12 is electrically connected to the first end of the heater 30 .
  • the heater 30 The second end is electrically connected to the negative electrode of the battery module 20 .
  • the first end of the heater 30 is electrically connected to the positive electrode of the battery module 20
  • the second end of the heater 30 is electrically connected to the second end of the first switch 12
  • the first end of the first switch 12 is electrically connected.
  • the terminal is electrically connected to the negative electrode of the battery module 20 .
  • the control end of the first switch 12 is electrically connected to the controller 11.
  • the controller 11 can send a control signal to the control end of the first switch 12 to turn the first switch 12 on or off, thereby causing the battery module 20,
  • the first switch 12 and the first circuit where the heater 30 is located are connected or disconnected to start heating the battery core module 20 or to stop heating the battery core module 20 .
  • the first switch 12 is electrically connected between the positive electrode of the battery module 20 and the heater 30, as shown in Figure 4.
  • the first switch 12 is electrically connected between the heater 30 and the negative electrode of the battery module 20 .
  • the control end of the first switch 12 is electrically connected to the controller 11, and the first switch 12 can be electrically connected between the positive electrode of the battery core module 20 and the heater 30 to realize control of the battery core module.
  • the positive terminal of group 20 is controlled.
  • the first switch 12 can also be electrically connected between the heater 30 and the negative electrode of the battery module 20 to control the negative electrode of the battery module 20 .
  • the controller 11 can control the positive electrode or the negative electrode of the battery module 20, and control the on and off of the first switch 12. It is suitable for the battery management system of positive electrode control and negative electrode control, and improves the battery provided by the embodiment of the present application. Suitability of heating circuit.
  • the first switch 12 may be a controllable switch including a control terminal, an input terminal, and an output terminal.
  • the first switch 12 may be a triode, a PMOS tube, or an NMOS tube.
  • the first switch 12 is a MOS transistor (PMOS transistor or NMOS transistor)
  • the first switch 12 shown in Figures 2 and 3 is a PMOS transistor
  • the first switch 12 shown in Figure 4 is an NMOS transistor.
  • the gate of the MOS tube is the control terminal of the first switch 12
  • the source of the MOS tube is the first terminal of the first switch 12
  • the drain of the MOS tube is the second terminal of the first switch 12 .
  • FIG. 5 is a schematic block diagram of a battery heating circuit provided by yet another embodiment of the present application.
  • the battery heating circuit 10 includes, in addition to the controller 11 and the first switch 12 , a second switch 13 and a charging port 14 .
  • Charging port 14 can be electrically connected to charger 40 .
  • the second switch 13 is electrically connected to the heater 30 and the charging port 14 respectively.
  • the second switch 13 is a controllable switch that can receive a control signal from the controller 11 and perform on or off based on the received control signal.
  • the second switch 13 In response to the temperature of the battery module 20 being lower than the temperature threshold (for example -20° C.), the second switch 13 receives the control signal from the controller 11 and performs conduction, so that the charger 40 , the second switch 13 and the heater 30 are in the The second circuit is turned on, thereby increasing the temperature of the heater 30 to heat the battery module 20 .
  • the temperature threshold for example -20° C.
  • the BMS circuit board when the temperature of the battery module 20 is lower than the temperature threshold, the BMS circuit board can turn off the discharge switch to prevent the battery module 20 from discharging, because the battery module 20 is lower than the temperature threshold. Continuing to discharge in the environment may cause irreversible damage to the performance of the battery module 20. At this time, the battery module 20 no longer supplies power to the heater 30.
  • the controller 11 After the charger 40 is connected to the battery pack through the charging port 14, the controller 11 can respond to the charging handshake signal sent by the charger 40, and can send a control signal to the second switch 13 to turn on the second switch 13.
  • the charger 40, the second switch 13 and the second circuit where the heater 30 is located are turned on, and the charger 40 supplies power to the heater 30, causing the temperature of the heater 30 to rise to inflate the battery module. 20 is heated, thereby allowing the battery module 20 to rise to a suitable temperature in a relatively short period of time, thereby improving the charging and discharging performance of the battery module 20 in a low-temperature environment.
  • the BMS circuit board controls the battery module 20 not to discharge. Therefore, the heater 30 cannot be powered through the battery module 20. At this time, the heater 30 can be powered by The charging port 14 is electrically connected to the charger 40.
  • the controller 11 controls the second switch 13 to be turned on, and the charger 40 supplies power to the heater 30, so that the temperature of the heater 30 increases to heat the battery module 20. After the temperature of the battery module 20 rises to a suitable temperature, the BMS circuit board controls the battery module 20 to perform normal charging and discharging.
  • the control end of the second switch 13 is electrically connected to the controller 11, the control end of the second switch 13 can receive the control signal of the controller 11, and the charging port 14 includes a first Charging port C+ and second charging port C-.
  • the first end of the second switch 13 is electrically connected to the first charging port C+
  • the second end of the second switch 13 is electrically connected to the first end of the heater 30, and the second end of the heater 30 is electrically connected to Second charging port C - electrical connection.
  • the first end of the heater 30 is electrically connected to the first charging port C+, and the second end of the heater 30 is electrically connected to the second end of the second switch 13 , the first end of the second switch 13 is electrically connected to the second charging port C-.
  • the control end of the second switch 13 is electrically connected to the controller 11.
  • the controller 11 can send a control signal to the control end of the second switch 13 to turn the second switch 13 on or off, thereby causing the charger 40 and the second switch 13 to turn on or off.
  • the switch 13 and the second circuit where the heater 30 is located are connected or disconnected, causing the charger 40 to start or stop supplying power to the heater 30, and then start or stop heating the battery module 20.
  • the controller 11 controls the positive electrode of the battery module 20
  • the second switch 13 is electrically connected between the first charging port C+ and the heater 30 .
  • the controller 11 controls the negative electrode of the battery module 20
  • the second switch 13 is electrically connected between the heater 30 and the second charging port C-.
  • control end of the second switch 13 is electrically connected to the controller 11, and the second switch 13 can be electrically connected between the first charging port C+ and the heater 30 to realize the control of the battery module 20. positive pole for control.
  • the second switch 13 can be electrically connected between the heater 30 and the second charging port C- to control the negative electrode of the battery module 20 .
  • the controller 11 can control the positive electrode or the negative electrode of the battery module 20, and control the on and off of the second switch 13. It is suitable for battery management systems with positive electrode control and negative electrode control, and improves the performance provided by the embodiments of the present application. Suitability of battery heating circuit.
  • the second switch 13 may be a controllable switch including a control terminal, an input terminal, and an output terminal.
  • the second switch 13 may be a triode, a PMOS tube, or an NMOS tube.
  • the second switch 13 shown in Figure 3 is a PMOS tube
  • the second switch 13 shown in Figure 4 is an NMOS tube
  • the gate of the MOS tube is the second switch 13
  • the control end of the MOS tube is the source of the second switch 13 and the drain of the MOS tube is the second end of the second switch 13 .
  • FIG. 6 is a schematic block diagram of a battery heating circuit provided by yet another embodiment of the present application.
  • the battery heating circuit 10 also includes a detector 15 .
  • the detector 15 is electrically connected to the battery module 20 and the controller 11 respectively.
  • the detector 15 can obtain the temperature information of the battery module 20 and send the temperature information to the controller 11 .
  • the detector 15 can detect the temperature of the cell module 20 .
  • the controller 11 can send a control signal to the detector 15 so that the detector 15 detects the temperature of the battery module 20 to obtain the information for Temperature information indicating the temperature of the battery module 20 is sent to the controller 11, and the controller 11 can control the on/off of the first switch 12 and/or the second switch 13 according to the temperature information, so as to When the temperature of the battery module 20 is low, the battery module 20 is heated.
  • the controller 11 is in the sleep mode, the detector 15 does not detect the temperature of the battery module 20 to reduce the power consumption of the battery pack 100 .
  • the battery module 20 starts charging and discharging.
  • the detector 15 detects the temperature of the battery module 20 to heat the battery module 20 in time when the temperature of the battery module 20 is low. , ensuring that the battery module 20 can quickly perform normal charging and discharging.
  • the wake-up state of the controller 11 can be represented by the BMS circuit board being in a working state
  • the non-wake-up state of the controller 11 can be represented by the BMS circuit board being in a low-power consumption state.
  • the non-wake-up state includes but is not limited to the sleep state and the standby state. , shutdown state, etc.
  • the controller 11 is in a non-awakened state and disconnects the power supply of some circuits, such as disconnecting the power supply of the detector 15, to achieve The low power consumption of the battery pack 100 is achieved.
  • the detector 15 may be a temperature sensor provided on the surface of the battery module 20 , or may be an analog acquisition front end (Analog Front End, AFE) chip provided on the BMS circuit board.
  • AFE Analog Front End
  • the awakening of the controller 11 includes various forms, such as responding to a start-up signal of an electronic device (such as an electric two-wheeled vehicle, a drone, an electric tool, etc.), the controller 11 enters the working state from the sleep state. , the controller 11 is awakened, or in response to the charger 40 being connected to the charging port 14, the controller 11 receives a charging signal, and the controller 11 is awakened.
  • an electronic device such as an electric two-wheeled vehicle, a drone, an electric tool, etc.
  • the controller 11 receives a power-on signal triggered by the user through a power-on button, etc.
  • the controller 11 is awakened after receiving the power-on signal, and then the controller 11 obtains the temperature information of the detector 15 to detect when the temperature of the battery module 20 is low.
  • the power supply line of the heater 30 is turned on, the battery core module 20 is heated through the heater 30, so that the battery core module 20 is at a more suitable temperature.
  • the controller 11 can receive the charging handshake signal sent by the charger 40 and be awakened. Then the controller 11 obtains the temperature information of the detector 15 to detect when the temperature of the battery module 20 is low.
  • the power supply line of the heater 30 is turned on, the battery core module 20 is heated through the heater 30, so that the battery core module 20 is at a more suitable temperature.
  • the controller 11 wakes up after receiving a power-on signal or a charging signal. After waking up, the controller 11 can control the detector 15 to detect the temperature of the battery module 20, and then detect the temperature of the battery module 20. When the temperature is low, the power supply line of the heater 30 is turned on, and the battery module 20 is heated by the heater 30 so that the battery module 20 can be charged or discharged normally, which can ensure that the battery module 20 can operate in a low-temperature environment. Normal charging and discharging can also reduce the power consumption of the battery heating circuit 10 .
  • the second switch 13 in response to the voltage of the charger 40 being higher than the first voltage threshold, the second switch 13 receives the control signal from the controller 11 to perform shutdown.
  • the charger 40 supplies power to the heater 30, and the controller 11 obtains the first charging port C+ and the second charging port C-. This voltage is the output voltage of the charger 40. If the controller 11 determines that the voltage is higher than the first voltage threshold, it sends a control signal to the second switch 13 to turn off the second switch 13 to avoid The heater 30 is burned out, ensuring the safety of heating the battery module 20 .
  • the first voltage threshold may be the rated voltage of the battery module 20 .
  • the first voltage threshold may be greater than the rated voltage of the battery module 20 , for example It can be 5V, 10V or 15V higher than the rated voltage of the battery module 20.
  • the above specific value of the first voltage threshold is only an example and does not constitute a limitation on the first voltage threshold.
  • the battery heating circuit 10 further includes a first diode 16.
  • the anode of the first diode 16 is electrically connected to the anode of the battery module 20.
  • the first The cathode of diode 16 is electrically connected to first switch 12 .
  • the anode of the first diode 16 is electrically connected to the anode of the battery module 20
  • the cathode of the first diode 16 is electrically connected to the first switch 12 The first end is electrically connected.
  • the positive electrode of the battery module 20 is electrically connected to the first end of the heater 30
  • the second end of the heater 30 is electrically connected to the anode of the first diode 16
  • the anode of the first diode 16 is indirectly electrically connected to the anode of the battery module 20 through the heater 30
  • the cathode of the first diode 16 is electrically connected to the second terminal of the first switch 12 .
  • the anode of the first diode 16 is electrically connected to the anode of the battery module 20, and the cathode of the first diode 16 is electrically connected to the first switch 12. Based on the one-way conductive performance of the diode, The current in the first circuit can only flow from the battery module 20 to the first switch 12, but not from the first switch 12 to the battery module 20, thus avoiding the occurrence of short circuit and other faults and ensuring that the battery heating circuit 10 and Battery management system safety.
  • the battery heating circuit 10 further includes a second diode 17 , the anode of the second diode 17 is electrically connected to the charging port 14 , and the second diode 17 The cathode is electrically connected to the second switch 13 .
  • the anode of the second diode 17 is electrically connected to the first charging port C+, and the cathode of the second diode 17 is electrically connected to the first terminal of the second switch 13 . connect.
  • the first end of the heater 30 is electrically connected to the first charging port C+, the second end of the heater 30 is electrically connected to the anode of the second diode 17, and the second end of the heater 30 is electrically connected to the anode of the second diode 17.
  • the cathode of the pole tube 17 is electrically connected to the second terminal of the second switch 13 .
  • the anode of the second diode 17 is electrically connected to the charging port 14, and the cathode of the second diode 17 is electrically connected to the second switch 13.
  • the second circuit The current in the battery can only flow from the charger 40 to the second switch 13, but not from the second switch 13 to the charger 40. This avoids short circuit and other faults and ensures the safety of the battery heating circuit 10 and the battery management system.
  • the battery heating circuit 10 further includes a third switch 18 and a fourth switch 19 , and the third switch 18 and the fourth switch 19 are connected in series.
  • the third switch 18 and the fourth switch 19 may be electrically connected between the positive electrode of the battery module 20 and the positive output terminal P+ of the battery module 20 .
  • the third switch 18 and the fourth switch 19 can also be electrically connected between the negative electrode of the battery module 20 and the negative output terminal P- of the battery module 20 .
  • the third switch 18 and the fourth switch 19 are controllable switches provided on the BMS circuit board for controlling the charging and discharging of the battery module 20.
  • the control of the third switch 18 and the fourth switch 19 Both terminals are electrically connected to the controller 11.
  • the controller 11 sends control signals to the third switch 18 and the fourth switch 19 to turn the third switch 18 and the fourth switch 19 on or off to control the battery module 20. charge and discharge are controlled.
  • the circuit where the third switch 18 and the fourth switch 19 are located is connected in parallel with the circuit where the first switch 12 and/or the second switch 13 is located, so that when the third switch 18 and the fourth switch 19 are both turned off, the first switch 12 or After the second switch 13 is turned on, the battery module 20 can still be heated, so that the battery module 20 can be preheated before charging or discharging, ensuring that the battery module 20 can Normal charging and discharging in a low temperature environment can also extend the service life of the battery module 20 .
  • the third switch 18 and the fourth switch 19 may be power tubes.
  • the third switch 18 and the fourth switch 19 are both NMOS tubes. .
  • the charging port and the discharging port of the battery module 20 are the same port as an example. That is, the first charging switch C+ can be used as the positive output terminal P+ of the battery module 20, and the second charging switch C+ can be used as the positive output terminal P+ of the battery module 20. Port C- can be used as the negative output terminal P- of the battery module 20.
  • the charging port and the discharge port of the battery module 20 can be the same port or different ports. This application implements This example does not limit this.
  • the controller 11 in response to the temperature of the battery module 20 not being lower than the preset temperature threshold, the controller 11 sends a control signal to the first switch 12 to turn on the first switch 12 . If the charger 40 is not connected to the charging port 14, after the first switch 12 is turned on, the circuit including the battery module 20, the first diode 16, the first switch 12 and the heater 30 is turned on, and the battery module 20 supplies power to the heater 30 to increase the temperature of the heater 30 to heat the battery module 20 .
  • the charger 40 If the charger 40 is connected to the charging port 14 and the first switch 12 is turned on, based on the unidirectional conduction performance of the first diode 16 and the second diode 17, if the output voltage of the battery module 20 is greater than the charger
  • the circuit including the battery module 20, the first diode 16, the first switch 12 and the heater 30 is turned on, and the battery module 20 supplies power to the heater 30, causing the temperature of the heater 30 to rise. high to heat the battery module 20.
  • the charger 40, the second diode 17, the first switch 12 and the heater 30 are located. When the circuit is turned on, the charger 40 supplies power to the heater 30 to increase the temperature of the heater 30 to heat the battery module 20 .
  • the controller 11 in response to the temperature of the battery module 20 not being lower than the preset temperature threshold, the controller 11 sends a control signal to the first switch 12 to turn on the first switch 12 , and the first switch 12 turns on.
  • the second switch 13 remains off.
  • the circuit including the battery module 20, the first diode 16, the first switch 12 and the heater 30 is turned on, and the battery module 20 becomes a heater. 30 supplies power to raise the temperature of the heater 30 to heat the battery module 20 .
  • the controller 11 obtains the temperature of the battery module 20. If the temperature of the battery module 20 is lower than the preset temperature threshold, the controller 11 sends control to the second switch 13.
  • the charger 40 supplies power to the heater 30 to increase the temperature of the heater 30 to heat the battery module 20 .
  • the first switch 12 is connected in series with the first diode 16, and the second switch 13 is connected in series with the second diode 17.
  • a logic error occurs in the controller 11, for example, the control signal sent by the controller 11
  • the signal turns on both the first switch 12 and the second switch 13.
  • the second diode 17 may be a Schottky diode. Since the Schottky diode has an over-current protection function, when an over-current fault occurs in the charger 40, that is, when the output current of the charger 40 is greater than the set value, the second diode 17 (Schottky diode) fuses and protects the second diode 17. Two switches 13 and heater 30. When the second diode 17 is a Schottky diode, based on the overcurrent protection function of the Schottky diode, the battery heating circuit 10 does not need an additional fuse, ensuring that the battery heating circuit 10 has a lower cost.
  • the battery core module 20 includes at least one battery core 21
  • the heater 30 includes at least one sub-heater 31 .
  • the sub-heaters 31 correspond to the electric core 21 one-to-one.
  • Each sub-heater 31 includes at least two metal terminals, and the metal terminals are led out from the inside of the electric core 21 .
  • the battery core module 20 includes one or more battery cores 21.
  • Each battery core 21 is provided with a sub-heater 31.
  • the sub-heater 31 generates heat after being energized to heat the battery core 21. , the temperature of the battery core 21 can be increased more quickly.
  • FIG. 7 is a schematic diagram of the battery core 21 provided in one embodiment of the present application
  • FIG. 8 is a schematic diagram of the sub-heater 31 provided in one embodiment of the present application.
  • the sub-heater 31 includes a heating piece 311 and a metal terminal 312.
  • the heating piece 311 is electrically connected to the metal terminal 312.
  • the heating piece 311 is disposed inside the battery core 21.
  • the metal terminal 312 comes from the inside of the battery core 21. lead out to facilitate the electrical connection between the sub-heaters 31 and the electrical connection between the heater 30 and the battery heating circuit 10 and the cell module 20 .
  • the battery core 21 also includes a positive terminal 211 and a negative terminal 212 .
  • the heating piece 311 has a sheet-like serpentine structure, and the heating piece 311 can be made of copper, aluminum or nickel.
  • the heating current is 6A to power the heating plate 311 for 240 seconds.
  • the surface temperature rise rate of the battery core using the copper heating plate is 2.4°C/min.
  • the surface temperature rise rate of the battery core using the aluminum heating plate The temperature rise rate is 4.0°C/min, and the surface temperature rise rate of the battery core using nickel heating plate is 6.6°C/min.
  • the battery core 21 includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode.
  • the positive electrode, the separator, and the negative electrode are stacked and then wound on the heating sheet 311.
  • the heating sheet 311 is wound around the battery core 21. Internally, when the heating plate 311 is energized and generates heat, the temperature of the battery core 21 can be increased faster.
  • Table 1 below shows the heating effect data of the two heating sheets relative to the comparative example.
  • Heating piece 1 Heating piece 2 Comparative ratio Heating plate position Embedded battery cell Embedded battery cell Wrapped around the battery core Heating piece resistance ( ⁇ ) 13.8 13.2 15.2
  • the weight of each heating piece is less than 0.45g
  • the weight of the battery core is 92g
  • the energy density loss (GED loss) of the battery core where each heating piece is located Both are ⁇ 0.5%
  • the thickness of heating plate 1 and heating plate 2 is less than 50 ⁇ m
  • the thickness of the heating plate in the comparative example is less than 0.5mm.
  • ⁇ is used to indicate the temperature uniformity on the surface of the battery module. The more ⁇ , the better the temperature uniformity on the surface of the battery module.
  • the heater 30 includes at least three sub-heaters 31, and any of the following electrical connection forms are formed between each sub-heater 31:
  • Each sub-heater 31 is electrically connected in series;
  • the hybrid electrical connection between the sub-heaters 31 means that the first sub-heater 31 is connected in series, the remaining sub-heaters 31 are connected in series, and the first sub-heater 31 is connected to the remaining sub-heaters.
  • the heaters 31 form a parallel electrical connection. As shown in FIGS. 2 and 3 , a mixed electrical connection is formed between each sub-heater 31 . As shown in FIG. 4 , each sub-heater 31 is electrically connected in series.
  • the total resistance of the heater 30 can be reduced, thereby increasing the input heating of each sub-heater under the premise that the input voltage remains unchanged.
  • the heating current of the heater 31 allows each sub-heater 31 to increase the temperature of the battery core 21 more quickly, thereby improving the heating effect of the battery core module 20 .
  • the sub-heaters 31 are arranged inside the battery core 21, and a hybrid electrical connection is formed between the sub-heaters 31.
  • the distributed power supply method can be used to supply power to each sub-heater 31, ensuring the flexibility of supplying power to the heater 31.
  • FIG. 9 is a flow chart of a battery heating method provided by an embodiment of the present application.
  • the battery heating method is applied to the battery pack 100 in the above embodiment. As shown in Figure 9, the battery heating method includes the following steps:
  • Step 901 In response to the temperature of the battery module being not lower than the temperature threshold, the controller sends a control signal to the first switch;
  • Step 902 The first switch is turned on in response to the received control signal, and the battery core module, the first switch and the first circuit where the heater is located are turned on, causing the temperature of the heater to rise to perform maintenance on the battery core module. heating;
  • Step 903 In response to the temperature of the battery module being lower than the temperature threshold, the controller sends a control signal to the second switch;
  • Step 904 The second switch is turned on in response to the received control signal, and the charger, the second switch and the second circuit where the heater is located are turned on, causing the temperature of the heater to rise to heat the battery module.
  • One embodiment of the present application provides an electronic device, including the battery pack in the above embodiment.
  • Electronic devices can be drones, electric two-wheelers, power tools, etc.
  • the electronic device When the electronic device is used in a lower temperature environment, it supplies power to the heater in the battery pack through the battery module or charger in the battery pack. , to heat the battery module through the heater, so that the battery module can rise to a suitable temperature in a short time, thereby improving the charging and discharging performance of the battery module in low-temperature environments, and improving the performance of electronic devices at low temperatures. environment.
  • Embodiments of the present application solve the technical problem of poor charging and discharging performance of secondary batteries in low-temperature environments and easy damage to secondary batteries.
  • the controller can send a control signal to the first switch to turn on the first switch.
  • the battery module, the first switch and the first circuit where the heater is located are connected, and the battery module
  • the group supplies power to the heater to increase the temperature of the heater to heat the battery module, so that the battery module can rise to a suitable temperature in a short time, thereby improving the performance of the battery module in low temperature environments. Charge and discharge performance.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Des modes de réalisation de la présente demande concernent une batterie, un procédé de chauffage de batterie et un dispositif électronique. La batterie comprend un circuit de chauffage de batterie, un module de cellule et un dispositif de chauffage. Le circuit de chauffage de batterie comprend un dispositif de commande et un premier commutateur, le premier commutateur pouvant recevoir un signal de commande du dispositif de commande pour allumer ou éteindre ; le premier commutateur est électriquement connecté au module de cellule et au dispositif de chauffage pour former un premier circuit ; et le premier commutateur est configuré pour recevoir un signal de commande du dispositif de commande et commuter en réponse à la température du module de cellule qui n'est pas inférieure à une valeur de seuil de température, de façon à allumer le premier circuit, de sorte que la température du dispositif de chauffage s'élève pour chauffer le module de cellule. Le module de cellule comprend au moins une cellule, et le dispositif de chauffage comprend au moins un sous-dispositif de chauffage, le sous-dispositif de chauffage correspondant à la cellule sur une base biunivoque ; et chaque sous-dispositif de chauffage comprenant au moins deux bornes métalliques, qui sont sorties de l'intérieur de la cellule. La solution peut améliorer les performances de charge et de décharge d'une batterie rechargeable dans un environnement à basse température.
PCT/CN2022/082488 2022-03-23 2022-03-23 Batterie, procédé de chauffage de batterie et dispositif électronique WO2023178550A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012105636A1 (fr) * 2011-02-02 2012-08-09 株式会社Ｇｓユアサ Système de batterie
CN204857867U (zh) * 2015-06-29 2015-12-09 辽宁凯信新能源技术有限公司 一种在低温环境下使用的锂离子电池
CN106450582A (zh) * 2016-09-06 2017-02-22 深圳天珑无线科技有限公司 一种电池的加热方法、加热系统及电池
CN111326828A (zh) * 2020-03-17 2020-06-23 珠海冠宇动力电池有限公司 一种电芯模组及电池系统
CN111446519A (zh) * 2019-01-17 2020-07-24 中信国安盟固利动力科技有限公司 一种带内部加热装置的锂离子电池
CN111684648A (zh) * 2019-09-18 2020-09-18 深圳市大疆创新科技有限公司 一种电池及可移动平台

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012105636A1 (fr) * 2011-02-02 2012-08-09 株式会社Ｇｓユアサ Système de batterie
CN204857867U (zh) * 2015-06-29 2015-12-09 辽宁凯信新能源技术有限公司 一种在低温环境下使用的锂离子电池
CN106450582A (zh) * 2016-09-06 2017-02-22 深圳天珑无线科技有限公司 一种电池的加热方法、加热系统及电池
CN111446519A (zh) * 2019-01-17 2020-07-24 中信国安盟固利动力科技有限公司 一种带内部加热装置的锂离子电池
CN111684648A (zh) * 2019-09-18 2020-09-18 深圳市大疆创新科技有限公司 一种电池及可移动平台
CN111326828A (zh) * 2020-03-17 2020-06-23 珠海冠宇动力电池有限公司 一种电芯模组及电池系统

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