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JP-7857435-B2 - Battery pack with improved fast charging capabilities

JP7857435B2JP 7857435 B2JP7857435 B2JP 7857435B2JP-7857435-B2

Inventors

  • ヒュン－ウ・パク
  • ヨ－ハン・クォン
  • ウン－ビ・キム
  • ソン－ウォン・パク
  • ドン－ジュン・イ

Assignees

  • エルジー エナジー ソリューション リミテッド

Dates

Publication Date
20260512
Application Date
20230525
Priority Date
20220527

Claims (12)

  1. The first battery and the second battery, A connector section including electrode terminals and communication terminals, configured to be connectable to an external device, A BMS is configured to determine whether or not the connector portion is connected to the external device, and to control the electrical connection relationship between the first battery and the second battery and the external device according to the external device connected to the connector portion, A battery pack comprising, The BMS is configured such that when a charger is connected to the connector as an external device, it connects at least one of the first battery and the second battery to the charger according to the charging type. The battery pack is characterized in that the BMS is configured to connect the second battery to the charger and disconnect the connection between the first battery and the charger when the charging type is rapid charging.
  2. The battery pack according to claim 1, characterized in that the BMS is configured to receive information related to the charging type from the charger.
  3. The aforementioned BMS is The battery pack according to claim 1, characterized in that, when the charging type is slow charging, the first battery and the second battery are configured to be connected to the charger.
  4. The aforementioned BMS is The battery pack according to claim 1, characterized in that after the rapid charging of the second battery is completed, the charging type is changed to slow charging and the first battery and the charger are connected.
  5. The first battery and the second battery, A connector section including electrode terminals and communication terminals, configured to be connectable to an external device, A BMS is configured to determine whether or not the connector portion is connected to the external device, and to control the electrical connection relationship between the first battery and the second battery and the external device according to the external device connected to the connector portion, A battery pack comprising, The BMS is configured to connect the first battery to the load and disconnect the second battery to the load when a load is connected to the connector portion, in a battery pack.
  6. The aforementioned BMS is The battery pack according to claim 5, characterized in that it is configured to measure the voltage of the first battery connected to the load and to control the connection between the first battery and the second battery and the load based on the voltage of the first battery.
  7. The aforementioned BMS is The battery pack according to claim 6, characterized in that it is configured to connect the second battery to the load and disconnect the connection between the first battery and the load when the voltage of the first battery is below a preset critical voltage.
  8. The aforementioned BMS is The battery pack according to claim 7, characterized in that the voltage of the second battery is measured, and if the voltages of the first battery and the second battery are the same, the first battery is further connected to the load.
  9. A first relay is connected between the first battery and the electrode terminal and configured to electrically connect or disconnect the first battery and the electrode terminal according to the controlled operating state, A second relay is connected between the second battery and the electrode terminal and configured to electrically connect or disconnect the second battery and the electrode terminal according to the controlled operating state, The battery pack according to claim 1 or 5, further comprising:
  10. The aforementioned BMS is The battery pack according to claim 9, characterized in that it is configured to control the connection relationship between the first battery and the second battery and the external device by controlling the operating states of the first relay and the second relay.
  11. The first battery and the second battery are The battery pack according to claim 1 or 5, characterized in that it is configured to have different negative electrode active materials.
  12. An automobile comprising a battery pack according to any one of claims 1 to 8 .

Description

This invention relates to a battery pack, and more specifically, to a battery pack with improved rapid charging capabilities. This application claims priority under Korean Patent Application No. 10-2022-0065676, filed on May 27, 2022, and all information disclosed in the specification and drawings of said application is incorporated herein by reference. Recently, with the surge in demand for portable electronic products such as notebook PCs, video cameras, and mobile phones, and the full-scale development of electric vehicles, energy storage batteries, robots, and satellites, research into high-performance batteries capable of repeated charging and discharging is progressing rapidly. Currently, commercially available batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium batteries. Of these, lithium batteries are gaining attention due to their advantages over nickel-based batteries, such as almost no memory effect, flexible charging and discharging, very low self-discharge rate, and high energy density. In recent years, as the number of electric vehicle users has increased, the demand for rapid charging of the batteries contained in electric vehicles has also increased. For example, to achieve rapid charging within 15 minutes, a current of 4C (C-rate) or higher must be applied. However, since mass-produced electric vehicle batteries are graphite-based batteries, there is a problem that lithium plating may occur when high currents of 4C or higher are applied. Here, lithium plating (Li-plating) refers to the phenomenon of lithium metal being deposited on the surface of the negative electrode. Lithium plating can cause side reactions with the electrolyte and/or deformation of the battery's kinetic balance, leading to battery degradation. Furthermore, the deposition of lithium metal on the negative electrode surface can cause internal short circuits in the battery, posing a risk of fire and explosion. Therefore, there is a need to develop battery packs that prevent lithium plating while also enabling rapid charging. This figure schematically shows a battery pack according to one embodiment of the present invention.This figure schematically shows the configuration of a battery pack according to one embodiment of the present invention.This figure schematically shows the charging process of a battery pack according to one embodiment of the present invention.This figure schematically illustrates an embodiment in which a battery pack according to one embodiment of the present invention is subjected to slow charging.This figure schematically illustrates an embodiment in which a battery pack according to one embodiment of the present invention is subjected to slow charging.This figure schematically illustrates an embodiment in which a battery pack according to one embodiment of the present invention is rapidly charged.This figure schematically illustrates an embodiment in which a battery pack according to one embodiment of the present invention is rapidly charged.This figure schematically illustrates an embodiment in which a battery pack according to one embodiment of the present invention is rapidly charged.This figure schematically illustrates one embodiment of a battery pack according to one embodiment of the present invention in which it discharges.This figure schematically illustrates one embodiment of a battery pack according to one embodiment of the present invention in which it discharges.This figure schematically illustrates one embodiment of a battery pack according to one embodiment of the present invention in which it discharges.This figure schematically illustrates another embodiment of a battery pack according to one embodiment of the present invention in which the battery pack discharges.This figure schematically illustrates another embodiment of a battery pack according to one embodiment of the present invention in which the battery pack discharges.This is a schematic diagram illustrating an automobile according to another embodiment of the present invention. Desired embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and the claims should not be interpreted in a manner limited to their usual or dictionary meanings, but rather in a manner consistent with the technical idea of the present invention, in accordance with the principle that the inventor himself can appropriately define the concepts of terms in order to best describe the invention. Therefore, the embodiments and configurations shown in the drawings described herein represent only one of the most preferred embodiments of the present invention and do not represent the entirety of the technical concept of the invention. It should be understood that, at the time of this application, there may be a variety of equivalents and modifications that can be substituted therewith. Fu