Search

JP-2026075019-A - Charging and discharging system and charging and discharging method

JP2026075019AJP 2026075019 AJP2026075019 AJP 2026075019AJP-2026075019-A

Abstract

[Challenge] In order to provide the corresponding battery charging and discharging functions and battery protection functions, it is necessary to design different charging and discharging systems. [Solution] In a charge/discharge system comprising a battery module detection circuit, a charge/discharge controller, and a microcontroller, the method involves the battery module detection circuit receiving a battery module detection signal, generating a battery type determination signal and a deep discharge detection signal based on the detection signal, the microcontroller controlling the charge/discharge controller to perform a charge or discharge operation of the battery module, and if the battery module is determined to be a first battery type based on the battery type determination signal, a deep discharge protection function is performed based on the deep discharge detection signal, and if the battery module is determined to be a second battery type, the deep discharge protection function is stopped. [Selection Diagram] Figure 2

Inventors

  • 楊 良臣
  • 黎 奕緯

Assignees

  • 威盛電子股▲ふん▼有限公司

Dates

Publication Date
20260507
Application Date
20241127
Priority Date
20241021

Claims (20)

  1. A battery module detection circuit coupled to a battery module and used to receive a detection signal from the battery module, and which generates a battery type determination signal and a deep discharge detection signal based on the detection signal, The battery module detection circuit and the charge/discharge controller coupled to the battery module, The battery module detection circuit and the charge/discharge controller are coupled to a microcontroller used to control the charge/discharge controller and perform charging or discharging operations on the battery module, If the microcontroller determines the battery module to be a first battery type based on the battery type determination signal, the microcontroller controls the charge/discharge controller based on the deep discharge detection signal to perform a deep discharge protection function. A charge/discharge system in which, when the microcontroller determines the battery module to be a second battery type based on the battery type determination signal, the microcontroller controls the charge/discharge controller to stop the deep discharge protection function.
  2. The charge/discharge system according to claim 1, wherein the first battery type is a lithium-ion battery and the second battery type is a lithium-ion supercapacitor.
  3. The aforementioned battery module detection circuit A first transistor having its first terminal coupled to a reference voltage and its second terminal coupled to a first circuit node, A first resistor coupled between the control terminal and the first terminal of the first transistor, A second resistor is coupled between the control terminal of the first transistor and the second circuit node that receives the detection signal, The first terminal is connected to the third circuit node, the second terminal is connected to the ground terminal, the control terminal is connected to the second circuit node, and the third circuit node is a second transistor used to provide the battery type determination signal. A fifth resistor coupled between the operating voltage and the third circuit node, A charge/discharge system according to claim 1, comprising:
  4. The aforementioned battery module detection circuit A third resistor is coupled between the output voltage of the battery module and the first circuit node, and the first circuit node is used to provide the deep discharge detection signal. A fourth resistor is coupled between the first circuit node and the ground terminal. The charge/discharge system according to claim 3, further comprising the following:
  5. The battery module and the microcontroller are coupled to a voltage detection circuit used to detect the output voltage of the battery module and generate a voltage detection signal, and the circuit further comprises these circuits. The charge/discharge system according to claim 1, wherein the microcontroller controls the charge/discharge controller based on the voltage detection signal to perform the charging operation or the discharging operation on the battery module.
  6. The charge/discharge system according to claim 5, wherein the microcontroller outputs a control signal to the charge/discharge controller based on the voltage detection signal, and the charge/discharge controller decides to perform the charging operation on the battery module based on the control signal.
  7. The battery module and the microcontroller are further coupled, and the temperature detection circuit is used to output a temperature detection voltage to the microcontroller. The microcontroller determines, based on the battery type determination signal, whether to read a first lookup table corresponding to the first battery type or a second lookup table corresponding to the second battery type, and the microcontroller retrieves the battery temperature by searching the first lookup table or the second lookup table based on the temperature detection voltage. The charge/discharge system according to claim 5, wherein the microcontroller determines the battery voltage of the battery module based on the voltage detection signal, and the microcontroller controls the charge/discharge controller based on the battery voltage and the battery temperature to perform the charge operation or the discharge operation on the battery module.
  8. The charge/discharge system according to claim 7, wherein, when the microcontroller determines that the battery voltage is lower than a first voltage threshold, the battery temperature is between a first temperature threshold and a second temperature threshold, and the rate of increase in the battery temperature is less than or equal to a predetermined rate, the microcontroller controls the charge/discharge controller to perform the charging operation on the battery module, wherein the first temperature threshold is lower than the second temperature threshold.
  9. The charge/discharge system according to claim 7, wherein when the microcontroller receives a charge completion signal from the charge/discharge controller, the microcontroller controls the charge/discharge controller to stop the charging operation for the battery module.
  10. The charge/discharge system according to claim 7, wherein, when the microcontroller determines that the battery voltage is higher than a second voltage threshold, the microcontroller controls the charge/discharge controller to stop the charging operation for the battery module.
  11. The charge/discharge system according to claim 7, wherein, if the microcontroller determines that the battery temperature is lower than a first temperature threshold or higher than a second temperature threshold, the microcontroller controls the charge/discharge controller to stop the charging operation for the battery module, wherein the first temperature threshold is lower than the second temperature threshold.
  12. The charge/discharge system according to claim 7, wherein if the microcontroller determines that the rate of temperature rise of the battery is higher than a predetermined rate, the microcontroller controls the charge/discharge controller to stop the charging operation for the battery module.
  13. The charge/discharge system according to claim 7, wherein when the microcontroller performs the discharge operation on the battery module, the microcontroller determines whether the battery voltage is lower than a third voltage threshold and stops the discharge operation.
  14. The temperature detection circuit, A sixth resistor coupled between the operating voltage and the fourth circuit node, the fourth circuit node being used to provide the temperature sensing voltage, A seventh resistor coupled between the fourth circuit node and the ground terminal, A capacitor coupled between the fourth circuit node and the ground terminal, The charge/discharge system according to claim 7, comprising:
  15. The charge/discharge system according to claim 14, wherein the fourth circuit node is further coupled to the negative temperature coefficient resistor of the battery module.
  16. The battery module detection circuit receives a detection signal from the battery module, and generates a battery type determination signal and a deep discharge detection signal based on the detection signal. A microcontroller controls the charge/discharge controller to perform charging or discharging operations on the battery module. When the microcontroller determines that the battery module is of a first battery type based on the battery type determination signal, the microcontroller controls the charge/discharge controller based on the deep discharge detection signal to perform a deep discharge protection function. If the microcontroller determines that the battery module is of the second battery type based on the battery type determination signal, the microcontroller controls the charge/discharge controller to stop the deep discharge protection function. A charging and discharging method, including the method described above.
  17. The voltage detection circuit detects the output voltage of the battery module and generates a voltage detection signal. The microcontroller controls the charge/discharge controller based on the voltage detection signal to perform the charging or discharging operation on the battery module. The charging and discharging method according to claim 16, further comprising:
  18. The temperature detection circuit outputs a temperature detection voltage to the microcontroller, The microcontroller determines, based on the battery type determination signal, whether to read a first lookup table corresponding to the first battery type or a second lookup table corresponding to the second battery type, The microcontroller retrieves the battery temperature by searching the first lookup table or the second lookup table based on the temperature detection voltage. The microcontroller determines the battery voltage of the battery module based on the voltage detection signal, The microcontroller controls the charge/discharge controller based on the battery voltage and battery temperature to perform the charging or discharging operation on the battery module. The charging and discharging method according to claim 17, further comprising:
  19. The step of controlling the charge/discharge controller based on the battery voltage and battery temperature to perform the charging operation on the battery module includes, if the microcontroller determines that the battery voltage is lower than a first voltage threshold, the battery temperature is between a first temperature threshold and a second temperature threshold, and the rate of increase of the battery temperature is less than or equal to a predetermined rate, the microcontroller controls the charge/discharge controller to perform the charging operation on the battery module. The charging and discharging method according to claim 18, wherein the first temperature threshold is lower than the second temperature threshold.
  20. The charging and discharging method according to claim 18, wherein the step of controlling the charge/discharge controller based on the battery voltage and battery temperature to perform the charging operation on the battery module includes, when the microcontroller receives a charging completion signal from the charge/discharge controller, the microcontroller determines that the battery voltage is higher than a second voltage threshold, the microcontroller determines that the battery temperature is lower than a first temperature threshold or higher than a second temperature threshold, or the microcontroller determines that the temperature rise rate of the battery is higher than a predetermined rate, the microcontroller controls the charge/discharge controller to stop the charging operation on the battery module.

Description

This invention relates to a system, and more particularly to a charge/discharge system and a charge/discharge method. Conventional charge/discharge devices are not applicable to energy storage devices of different battery types. Furthermore, even if a charge/discharge device could be applied to different battery types, existing methods require the design of different charge/discharge systems to provide corresponding battery charging/discharging and battery protection functions, making them unsuitable for arbitrary swapping between different battery types of energy storage devices. This is a schematic diagram of a charge/discharge system according to one embodiment of the present invention.This is a flowchart of a charging and discharging method according to one embodiment of the present invention.This is a schematic diagram of a charge/discharge system according to one embodiment of the present invention.This is a circuit diagram of a battery module detection circuit according to one embodiment of the present invention.This is a circuit diagram of a temperature detection circuit relating to one embodiment of the present invention.This is a flowchart of the charging protection function according to one embodiment of the present invention.This is a flowchart of the discharge protection function in one embodiment of the present invention. To facilitate understanding of the present invention, the following embodiments are presented as examples of how the invention can be carried out. Furthermore, wherever possible, parts/components/steps for which the same reference numerals are used in the drawings and embodiments represent the same or similar components. Figure 1 is a schematic diagram of a charge/discharge system according to one embodiment of the present invention. Referring to Figure 1, the charge/discharge system 100 comprises a microcontroller (MCU) 110, a battery module detection circuit 120, and a charge/discharge controller 130. The microcontroller 110 is coupled to the battery module detection circuit 120 and the charge/discharge controller 130. The battery module detection circuit 120 is further coupled to a battery module 200. The charge/discharge controller 130 is further coupled to the battery module 200. The battery module 200 may include one or more battery packs. In this embodiment, the charge/discharge system 100 supports charging and discharging of battery modules of a first battery type and a second battery type. In one embodiment, the first battery type may be a lithium-ion battery, and the second battery type may be a lithium-ion supercapacitor, but the present invention is not limited thereto. In other embodiments, the charging/discharging system 100 may support other battery types, or two or more battery types. In this embodiment, the charge/discharge system 100 may be a power control unit, and the connection interface of the charge/discharge system 100 has multiple pins. At least one of the multiple pins of the charge/discharge system 100 may be coupled to the positive terminal of the battery of the battery module 200, and at least one of the multiple pins of the charge/discharge system 100 may be coupled to the negative terminal of the battery of the battery module 200. One of the multiple pins of the charge/discharge system 100 may also acquire the detection signal S_DET of the battery module 200. In one embodiment, the charge/discharge system 100 may also acquire the temperature detection voltage of the battery module 200 via another pin among the multiple pins. In this embodiment, the battery module detection circuit 120 can detect the battery type of the battery module 200, and the microcontroller 110 can perform charging and discharging operations on the battery module 200 based on its battery type. In this embodiment, the charging and discharging system 100 can also provide different charging and discharging functions based on the battery type of the battery module 200. In one embodiment, the charging and discharging system 100 can detect at least one of the battery voltage and battery temperature of the battery module 200, thereby providing corresponding charge protection, discharge protection, and/or deep-discharge protection functions based on at least one of the battery voltage and battery temperature. Figure 2 is a flowchart of a charge/discharge method according to one embodiment of the present invention. Referring to Figures 1 and 2, the charge/discharge system 100 in Figure 1 can perform the following steps S210 to S240. In step S210, the battery module detection circuit 120 receives the detection signal S_DET from the battery module 200 and generates a battery type determination signal S_DET_MCU and a deep discharge detection signal V_DDTH based on the detection signal S_DET. The battery module detection circuit 120 can output the battery type determination signal S_DET_MCU to the microcontroller 110 and the deep discharge detection signal V_DDTH to the charge/discharge