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EP-4343909-B1 - BATTERY CELL PRESSURIZATION DEVICE AND BATTERY CELL CHARGING/DISCHARGING DEVICE INCLUDING SAME

EP4343909B1EP 4343909 B1EP4343909 B1EP 4343909B1EP-4343909-B1

Inventors

  • Choi, Lak Young
  • WOO, Seunghe
  • KIM, JI YOUNG

Dates

Publication Date
20260513
Application Date
20230217

Claims (8)

  1. A battery cell pressurization device (110), comprising: a case (111) configured to receive a battery cell (10); and a fluid (112) inside of the case (111) pressurizing the battery cell (10), wherein the case (111) comprises an opening (113) configured to pass an electrically conductive member (130) through the opening (113) to connect the battery cell (10) to a charger/discharger (120), and wherein the electrically conductive member (130) is configured to apply a current to the battery cell (10), characterised in that the fluid (112) isotropically pressurizes the battery cell (10) during an activation process of charging/discharging the battery cell (10) with the charger/discharger (120), in that the battery cell (10) comprises a positive electrode (11), a negative electrode (12) and a solid electrolyte (13), and in that at least two among a size of the positive electrode (11), a size of the negative electrode (12), and a size of the solid electrolyte (13) are different from each other.
  2. The battery cell pressurization device (110) according to claim 1, wherein the case (111) further comprises an injection part (114), and wherein the injection part (114) comprises a path through which the fluid (112) is injected into the case (111).
  3. The battery cell pressurization device (110) according to claim 1, wherein the pressure applied to the battery cell (10) by the fluid (112) is 3 MPa or more and 10 MPa or less.
  4. The battery cell pressurization device (110) according to claim 1, wherein the fluid (112) comprises an insulating and viscous material.
  5. The battery cell pressurization device (110) according to claim 1, wherein the fluid (112) is in a state of oil or gel.
  6. The battery cell pressurization device (110) according to claim 1, wherein the case (111) has pressure resistance against deformation at a pressure of 3 MPa or more and 10 MPa or less.
  7. The battery cell pressurization device (110) according to claim 1, wherein the battery cell (10) is a pouch-type battery cell (10).
  8. A battery cell charging and discharging device (100) comprising: the battery cell pressurization device (110) according to any one of claims 1 to 7; and the charger/discharger (120) for charging/discharging the battery cell (10) pressurized by the battery cell pressurization device (110).

Description

[Technical Field] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0022268 filed on February 21, 2022. The present disclosure relates to a battery cell pressurization device and a battery cell charging and discharging device comprising the same. [Background Art] As technology development and demand for mobile devices are increasing, rechargeable secondary batteries are widely used as energy sources for various mobile devices. In addition, the secondary batteries are also attracting attention as an energy source for electric vehicles, hybrid vehicles, etc., which are proposed as a solution to air pollution caused by conventional gasoline vehicles or diesel vehicles. The secondary batteries are classified into coin-type batteries, cylindrical batteries, prismatic batteries, and pouch-type batteries depending on the shape of the battery case. Among them, since the pouch-type battery uses a pouch exterior material composed of a multilayer film of a metal layer (foil) and a synthetic resin layer coated on the upper and lower surfaces of the metal layer to construct the exterior, it is attracting a lot of attention because the weight of the battery can be significantly reduced as compared to a cylindrical or prismatic type that uses a metal can, and thus it has the advantage of enabling the battery to be lightweight and being able to change into various shapes. A pouch-type battery is generally manufactured through a process of activating a battery cell after a process of assembling a battery. In general, the activation process comprises a process of pressurizing the battery cell with a jig, and charging and discharging by applying current to the battery cell up to a predetermined voltage. In order to activate the positive electrode active material and create a stable surface film (SEI, Solid Electrolyte Interface) on the negative electrode during the first cycle, this activation process must necessarily be accompanied. In this activation process, a large amount of gas is generated inside the battery cell. If the gas generated inside the battery cell is not efficiently removed, as the central portion of the pouch exterior material swells, it not only causes deformation of the battery and deterioration of the performance of the battery such as capacity and output, but also adversely affects the lifetime of the battery. [Prior Art Document] [Patent Document] (Patent Document 0001) Korean Laid-open Patent Publication No. 10-2019-0072289 (2019.06.25) JP 2014-056778 A describes an energization method of a secondary battery which allows for long term repeated charge/discharge and high speed charging while preventing deterioration of an electrode part, and a secondary battery and an energization device. US 2016 / 0 315 296 A1 describes a high-capacity power storage device, including a positive electrode, a negative electrode, an exterior body, and an electrolyte. The outer periphery of each of the positive electrode active material layer and the negative electrode active material layer is a closed curve. The exterior body includes a film and a thermocompression-bonded region. The inner periphery of the thermocompression-bonded region is a closed curve. The electrolyte, the positive electrode active material layer, and the negative electrode active material layer are in a region surrounded by the thermocompression-bonded region. [Disclosure] [Technical Problem] It is one of the objects of the present invention to provide a battery cell pressurization device capable of isotropically pressurizing a battery cell and a battery cell charging and discharging device comprising the same. It is another object of the present invention to provide a battery cell pressurization device capable of preventing damage to a battery cell due to pressurization and a short circuit defect caused therefrom, and a battery cell charging and discharging device comprising the same. It is yet another object of the present invention to provide a battery cell pressurization device capable of preventing deterioration in performance and lifetime of a battery cell due to an activation process, and a battery cell charging and discharging device comprising the same. [Technical Solution] In one embodiment, the present invention provides a battery cell pressurization device according to claim 1 comprising a case configured tc receive a battery cell; and a fluid inside of the case pressurizing the battery cell, wherein the case comprises an opening configured to pass an electrically conductive member through the opening to connect the battery cell to a charger/discharger and applying a current to the battery cell. The fluid isotropically pressurizes the battery cell during an activation process of charging/discharging the battery cell with the charger/discharger. The battery cell comprises a positive electrode, a negative electrode and a solid electrolyte. At least two among a size of the positive electrode, a siz