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EP-4178067-B1 - CHARGING AND DISCHARGING DEVICE FOR SECONDARY BATTERY

EP4178067B1EP 4178067 B1EP4178067 B1EP 4178067B1EP-4178067-B1

Inventors

  • KIM, KI HOON

Dates

Publication Date
20260506
Application Date
20210915

Claims (6)

  1. A charging and discharging device for secondary battery (100), comprising: a body portion (110, 120); and a head portion (130) located under the body portion (110, 120), wherein the head portion (130) comprises a pin mounting portion (135) that is bound to the upper portion or lower portion of the secondary battery (10), wherein the pin mounting portion (135) comprises a current pin (136) and a voltage pin (137), wherein the current pin (136) and the voltage pin (137) each comprises a plurality of projections, and wherein an area of the pin mounting portion (135) where the current pin (136) is formed is larger than an area of the pin mounting portion (135) where the voltage pin (137) is formed, characterized in that the current pin (136) is formed in a center of the pin mounting portion (135), and the voltage pin (137) is formed at a periphery of the pin mounting portion (135) so as to surround the current pin (136).
  2. The charging and discharging device for secondary battery (100) according to claim 1, wherein: the current pin (136) is formed in the maximum area that can be formed in the pin mounting portion (135), and the voltage pin (137) is formed in the minimum area that can be formed in the pin mounting portion (135).
  3. The charging and discharging device for secondary battery (100) according to claim 1, wherein: the current pin (136) is formed in an area of 70% or more and 99% or less relative to a total area of the pin mounting portion (135), and the voltage pin (137) is formed in an area of 1% or more and 15% or less relative to the total area of the pin mounting portion (135).
  4. The charging and discharging device for secondary battery (100) according to any of claims 1 to 3, wherein: the current pin (136) has a diameter (R6) of 0.5 or more and 0.9 or less relative to the diameter of the pin mounting portion (135).
  5. The charging and discharging device for secondary battery (100) according to any of claims 1 to 4, wherein: the current pin (136) and the voltage pin (137) are spaced apart from each other.
  6. The charging and discharging device for secondary battery (100) according to claim 5, wherein: a distance between the current pin (136) and the voltage pin (137) that are spaced apart from each other is 0.01 or more to 0.5 or less relative to the diameter of the pin mounting portion (135).

Description

[BACKGROUND] Along with the increase of technology development and demands for mobile devices, the demand for batteries as energy sources is increasing rapidly. In particular, a secondary battery has attracted considerable attention as an energy source for power-driven devices, such as an electric bicycle, an electric vehicle, and a hybrid electric vehicle, as well as an energy source for mobile devices, such as a mobile phone, a digital camera, a laptop computer and a wearable device. Based on the shape of a battery case, such a secondary battery is classified into a cylindrical battery where an electrode assembly is built in a cylindrical metal can, a prismatic battery where an electrode assembly is built in a prismatic metal can, and a pouch type battery where an electrode assembly is built in a pouch type case formed of an aluminum laminate sheet. Among them, the cylindrical battery has an advantage of having a relatively large capacity and being structurally stable. The battery performance of such a secondary battery is evaluated through a charge and discharge process after the assembling process, and whether the battery is defective can be detected. At this time, the charge and discharge process of the secondary battery can be performed through a secondary battery charging and discharging device including a probe pin to which current and voltage are applied. However, when charging at a high rate in the charge and discharge process of the secondary battery, a heat generation phenomenon due to contact resistance may occur at the contact portion of the secondary battery to which the probe pins of the secondary battery charging and discharging device contact, which causes a problem that the accuracy of the battery performance evaluation of the secondary battery is lowered. A charging and discharging device is known from KR 2013 0071638 A. Another charging and discharging device is known from KR 2014 0067229 A. Yet another charging and discharging device is known from WO 2016/047857 A1. Therefore, there is a need to develop a charging and discharging device for a secondary battery having improved contact resistance. [DETAILED DESCRIPTION OF THE INVENTION] [Technical Problem] It is an object of the present disclosure to provide a charging and discharging device for secondary battery having improved contact resistance. The objects of the present disclosure are not limited to the aforementioned objects, and other objects which are not described herein should be clearly understood by those skilled in the art from the following detailed description and the accompanying drawings. [Technical Solution] The invention is characterized by the claims. According to an aspect of the present disclosure, there is provided a charging and discharging device for secondary battery, comprising: a body portion; and a head portion located under the body portion, wherein the head portion comprises a pin mounting portion that is bound to the upper portion or lower portion of the secondary battery, wherein the pin mounting portion includes a current pin and a voltage pin, wherein the current pin and the voltage pin each comprises a plurality of projections, and wherein an area of the pin mounting portion where the current pin is formed is larger than an area of the pin mounting portion where the voltage pin is formed. The current pin is formed in a center of the pin mounting portion, and the voltage pin is formed at a periphery of the pin mounting portion so as to surround the current pin. The current pin may be formed in the maximum area that can be formed in the pin mounting portion, and the voltage pin may be formed in a minimum area that can be formed in the pin mounting portion. The current pin may be formed in an area of 70% or more and 99% or less relative to the total area of the pin mounting portion, and the voltage pin may be formed in an area of 1% or more and 15% or less relative to the total area of the pin mounting portion. The current pin and the voltage pin may be located apart from each other. The current pin may have a diameter of 0.5 or more and 0.9 or less relative to the diameter of the pin mounting portion. The current pin and the voltage pin may be located apart from each other. The distance between the current pin and the voltage pin that are spaced apart from each other may be 0.01 or more to 0.5 or less relative to the diameter of the pin mounting portion. [Advantageous Effects] According to embodiments of the present disclosure, the charging and discharging device for a secondary battery of the present disclosure can improve the contact resistance. The effects of the present disclosure are not limited to the effects mentioned above and additional other effects not described above will be clearly understood from the detailed description and the appended drawings by those skilled in the art. [BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partial cross-sectional view of an upper portion of a cylindrical sec